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s390/dasd: remove setting of scheduler from driver
[deliverable/linux.git] / drivers / s390 / block / dasd.c
CommitLineData
1da177e4 1/*
1da177e4
LT		 2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
d41dd122 7 * Copyright IBM Corp. 1999, 2009
1da177e4
LT		 8 */
9
fc19f381
SH		 10#define KMSG_COMPONENT "dasd"
11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
1da177e4
LT		 13#include <linux/kmod.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/ctype.h>
17#include <linux/major.h>
18#include <linux/slab.h>
a885c8c4 19#include <linux/hdreg.h>
f3445a1a 20#include <linux/async.h>
9eb25122 21#include <linux/mutex.h>
4fa52aa7
SW		 22#include <linux/debugfs.h>
23#include <linux/seq_file.h>
e4258d55 24#include <linux/vmalloc.h>
1da177e4
LT		 25
26#include <asm/ccwdev.h>
27#include <asm/ebcdic.h>
28#include <asm/idals.h>
f3eb5384 29#include <asm/itcw.h>
33b62a30 30#include <asm/diag.h>
1da177e4
LT		 31
32/* This is ugly... */
33#define PRINTK_HEADER "dasd:"
34
35#include "dasd_int.h"
36/*
37 * SECTION: Constant definitions to be used within this file
38 */
39#define DASD_CHANQ_MAX_SIZE 4
40
41/*
42 * SECTION: exported variables of dasd.c
43 */
44debug_info_t *dasd_debug_area;
7048a2b5 45EXPORT_SYMBOL(dasd_debug_area);
4fa52aa7 46static struct dentry *dasd_debugfs_root_entry;
1da177e4 47struct dasd_discipline *dasd_diag_discipline_pointer;
7048a2b5 48EXPORT_SYMBOL(dasd_diag_discipline_pointer);
2b67fc46 49void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
1da177e4
LT		 50
51MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
52MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
a53c8fab 53 " Copyright IBM Corp. 2000");
1da177e4 54MODULE_SUPPORTED_DEVICE("dasd");
1da177e4
LT		 55MODULE_LICENSE("GPL");
56
57/*
58 * SECTION: prototypes for static functions of dasd.c
59 */
8e09f215
SW		 60static int dasd_alloc_queue(struct dasd_block *);
61static void dasd_setup_queue(struct dasd_block *);
62static void dasd_free_queue(struct dasd_block *);
63static void dasd_flush_request_queue(struct dasd_block *);
64static int dasd_flush_block_queue(struct dasd_block *);
65static void dasd_device_tasklet(struct dasd_device *);
66static void dasd_block_tasklet(struct dasd_block *);
4927b3f7 67static void do_kick_device(struct work_struct *);
d41dd122 68static void do_restore_device(struct work_struct *);
501183f2 69static void do_reload_device(struct work_struct *);
8e09f215 70static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
48cae885
SW		 71static void dasd_device_timeout(unsigned long);
72static void dasd_block_timeout(unsigned long);
eb6e199b 73static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
4fa52aa7
SW		 74static void dasd_profile_init(struct dasd_profile *, struct dentry *);
75static void dasd_profile_exit(struct dasd_profile *);
1da177e4
LT		 76
77/*
78 * SECTION: Operations on the device structure.
79 */
80static wait_queue_head_t dasd_init_waitq;
8f61701b 81static wait_queue_head_t dasd_flush_wq;
c80ee724 82static wait_queue_head_t generic_waitq;
4679e893 83static wait_queue_head_t shutdown_waitq;
1da177e4
LT		 84
85/*
86 * Allocate memory for a new device structure.
87 */
8e09f215 88struct dasd_device *dasd_alloc_device(void)
1da177e4
LT		 89{
90 struct dasd_device *device;
91
8e09f215
SW		 92 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
93 if (!device)
1da177e4 94 return ERR_PTR(-ENOMEM);
1da177e4
LT		 95
96 /* Get two pages for normal block device operations. */
97 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
8e09f215 98 if (!device->ccw_mem) {
1da177e4
LT		 99 kfree(device);
100 return ERR_PTR(-ENOMEM);
101 }
102 /* Get one page for error recovery. */
103 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
8e09f215 104 if (!device->erp_mem) {
1da177e4
LT		 105 free_pages((unsigned long) device->ccw_mem, 1);
106 kfree(device);
107 return ERR_PTR(-ENOMEM);
108 }
109
110 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
111 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
112 spin_lock_init(&device->mem_lock);
8e09f215 113 atomic_set(&device->tasklet_scheduled, 0);
138c014d 114 tasklet_init(&device->tasklet,
8e09f215 115 (void (*)(unsigned long)) dasd_device_tasklet,
1da177e4
LT		 116 (unsigned long) device);
117 INIT_LIST_HEAD(&device->ccw_queue);
118 init_timer(&device->timer);
48cae885
SW		 119 device->timer.function = dasd_device_timeout;
120 device->timer.data = (unsigned long) device;
4927b3f7 121 INIT_WORK(&device->kick_work, do_kick_device);
d41dd122 122 INIT_WORK(&device->restore_device, do_restore_device);
501183f2 123 INIT_WORK(&device->reload_device, do_reload_device);
1da177e4
LT		 124 device->state = DASD_STATE_NEW;
125 device->target = DASD_STATE_NEW;
9eb25122 126 mutex_init(&device->state_mutex);
4fa52aa7 127 spin_lock_init(&device->profile.lock);
1da177e4
LT		 128 return device;
129}
130
131/*
132 * Free memory of a device structure.
133 */
8e09f215 134void dasd_free_device(struct dasd_device *device)
1da177e4 135{
17fd682e 136 kfree(device->private);
1da177e4
LT		 137 free_page((unsigned long) device->erp_mem);
138 free_pages((unsigned long) device->ccw_mem, 1);
139 kfree(device);
140}
141
8e09f215
SW		 142/*
143 * Allocate memory for a new device structure.
144 */
145struct dasd_block *dasd_alloc_block(void)
146{
147 struct dasd_block *block;
148
149 block = kzalloc(sizeof(*block), GFP_ATOMIC);
150 if (!block)
151 return ERR_PTR(-ENOMEM);
152 /* open_count = 0 means device online but not in use */
153 atomic_set(&block->open_count, -1);
154
155 spin_lock_init(&block->request_queue_lock);
156 atomic_set(&block->tasklet_scheduled, 0);
157 tasklet_init(&block->tasklet,
158 (void (*)(unsigned long)) dasd_block_tasklet,
159 (unsigned long) block);
160 INIT_LIST_HEAD(&block->ccw_queue);
161 spin_lock_init(&block->queue_lock);
162 init_timer(&block->timer);
48cae885
SW		 163 block->timer.function = dasd_block_timeout;
164 block->timer.data = (unsigned long) block;
4fa52aa7 165 spin_lock_init(&block->profile.lock);
8e09f215
SW		 166
167 return block;
168}
7048a2b5 169EXPORT_SYMBOL_GPL(dasd_alloc_block);
8e09f215
SW		 170
171/*
172 * Free memory of a device structure.
173 */
174void dasd_free_block(struct dasd_block *block)
175{
176 kfree(block);
177}
7048a2b5 178EXPORT_SYMBOL_GPL(dasd_free_block);
8e09f215 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;
d42e1712 250 int rc = 0;
1da177e4
LT		 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;
d42e1712
SH		 277
278 return rc;
1da177e4
LT		 279}
280
281/*
282 * Release the irq line for the device. Terminate any running i/o.
283 */
8e09f215 284static int dasd_state_basic_to_known(struct dasd_device *device)
1da177e4 285{
8f61701b 286 int rc;
d42e1712 287
daa991bf
SH		 288 if (device->discipline->basic_to_known) {
289 rc = device->discipline->basic_to_known(device);
290 if (rc)
291 return rc;
292 }
293
8e09f215 294 if (device->block) {
4fa52aa7 295 dasd_profile_exit(&device->block->profile);
d7309aaa 296 debugfs_remove(device->block->debugfs_dentry);
8e09f215
SW		 297 dasd_gendisk_free(device->block);
298 dasd_block_clear_timer(device->block);
299 }
300 rc = dasd_flush_device_queue(device);
8f61701b
HH		 301 if (rc)
302 return rc;
8e09f215 303 dasd_device_clear_timer(device);
4fa52aa7 304 dasd_profile_exit(&device->profile);
d7309aaa 305 debugfs_remove(device->debugfs_dentry);
1da177e4
LT		 306 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
307 if (device->debug_area != NULL) {
308 debug_unregister(device->debug_area);
309 device->debug_area = NULL;
310 }
311 device->state = DASD_STATE_KNOWN;
8f61701b 312 return 0;
1da177e4
LT		 313}
314
315/*
316 * Do the initial analysis. The do_analysis function may return
317 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
318 * until the discipline decides to continue the startup sequence
319 * by calling the function dasd_change_state. The eckd disciplines
320 * uses this to start a ccw that detects the format. The completion
321 * interrupt for this detection ccw uses the kernel event daemon to
322 * trigger the call to dasd_change_state. All this is done in the
323 * discipline code, see dasd_eckd.c.
90f0094d
HH		 324 * After the analysis ccw is done (do_analysis returned 0) the block
325 * device is setup.
326 * In case the analysis returns an error, the device setup is stopped
327 * (a fake disk was already added to allow formatting).
1da177e4 328 */
8e09f215 329static int dasd_state_basic_to_ready(struct dasd_device *device)
1da177e4
LT		 330{
331 int rc;
8e09f215 332 struct dasd_block *block;
1da177e4
LT		 333
334 rc = 0;
8e09f215 335 block = device->block;
90f0094d 336 /* make disk known with correct capacity */
8e09f215
SW		 337 if (block) {
338 if (block->base->discipline->do_analysis != NULL)
339 rc = block->base->discipline->do_analysis(block);
340 if (rc) {
d42e1712 341 if (rc != -EAGAIN) {
8e09f215 342 device->state = DASD_STATE_UNFMT;
d42e1712
SH		 343 goto out;
344 }
8e09f215
SW		 345 return rc;
346 }
347 dasd_setup_queue(block);
348 set_capacity(block->gdp,
349 block->blocks << block->s2b_shift);
350 device->state = DASD_STATE_READY;
351 rc = dasd_scan_partitions(block);
d42e1712 352 if (rc) {
8e09f215 353 device->state = DASD_STATE_BASIC;
d42e1712
SH		 354 return rc;
355 }
8e09f215
SW		 356 } else {
357 device->state = DASD_STATE_READY;
358 }
d42e1712
SH		 359out:
360 if (device->discipline->basic_to_ready)
361 rc = device->discipline->basic_to_ready(device);
90f0094d 362 return rc;
1da177e4
LT		 363}
364
d07dc5d8
SH		 365static inline
366int _wait_for_empty_queues(struct dasd_device *device)
367{
368 if (device->block)
369 return list_empty(&device->ccw_queue) &&
370 list_empty(&device->block->ccw_queue);
371 else
372 return list_empty(&device->ccw_queue);
373}
374
1da177e4
LT		 375/*
376 * Remove device from block device layer. Destroy dirty buffers.
377 * Forget format information. Check if the target level is basic
378 * and if it is create fake disk for formatting.
379 */
8e09f215 380static int dasd_state_ready_to_basic(struct dasd_device *device)
1da177e4 381{
8f61701b
HH		 382 int rc;
383
1da177e4 384 device->state = DASD_STATE_BASIC;
8e09f215
SW		 385 if (device->block) {
386 struct dasd_block *block = device->block;
387 rc = dasd_flush_block_queue(block);
388 if (rc) {
389 device->state = DASD_STATE_READY;
390 return rc;
391 }
8e09f215 392 dasd_flush_request_queue(block);
b695adfa 393 dasd_destroy_partitions(block);
8e09f215
SW		 394 block->blocks = 0;
395 block->bp_block = 0;
396 block->s2b_shift = 0;
397 }
8f61701b 398 return 0;
1da177e4
LT		 399}
400
90f0094d
HH		 401/*
402 * Back to basic.
403 */
8e09f215 404static int dasd_state_unfmt_to_basic(struct dasd_device *device)
90f0094d
HH		 405{
406 device->state = DASD_STATE_BASIC;
8f61701b 407 return 0;
90f0094d
HH		 408}
409
1da177e4
LT		 410/*
411 * Make the device online and schedule the bottom half to start
412 * the requeueing of requests from the linux request queue to the
413 * ccw queue.
414 */
8f61701b 415static int
1da177e4
LT		 416dasd_state_ready_to_online(struct dasd_device * device)
417{
1301809b
SW		 418 struct gendisk *disk;
419 struct disk_part_iter piter;
420 struct hd_struct *part;
8e09f215 421
1da177e4 422 device->state = DASD_STATE_ONLINE;
1301809b 423 if (device->block) {
8e09f215 424 dasd_schedule_block_bh(device->block);
e4dbb0f2
SH		 425 if ((device->features & DASD_FEATURE_USERAW)) {
426 disk = device->block->gdp;
427 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
428 return 0;
429 }
1301809b
SW		 430 disk = device->block->bdev->bd_disk;
431 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
432 while ((part = disk_part_iter_next(&piter)))
433 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
434 disk_part_iter_exit(&piter);
435 }
1da177e4
LT		 436 return 0;
437}
438
439/*
440 * Stop the requeueing of requests again.
441 */
8e09f215 442static int dasd_state_online_to_ready(struct dasd_device *device)
1da177e4 443{
8e09f215 444 int rc;
1301809b
SW		 445 struct gendisk *disk;
446 struct disk_part_iter piter;
447 struct hd_struct *part;
8e09f215
SW		 448
449 if (device->discipline->online_to_ready) {
450 rc = device->discipline->online_to_ready(device);
451 if (rc)
452 return rc;
453 }
d42e1712 454
1da177e4 455 device->state = DASD_STATE_READY;
e4dbb0f2 456 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
1301809b
SW		 457 disk = device->block->bdev->bd_disk;
458 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
459 while ((part = disk_part_iter_next(&piter)))
460 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
461 disk_part_iter_exit(&piter);
462 }
8f61701b 463 return 0;
1da177e4
LT		 464}
465
466/*
467 * Device startup state changes.
468 */
8e09f215 469static int dasd_increase_state(struct dasd_device *device)
1da177e4
LT		 470{
471 int rc;
472
473 rc = 0;
474 if (device->state == DASD_STATE_NEW &&
475 device->target >= DASD_STATE_KNOWN)
476 rc = dasd_state_new_to_known(device);
477
478 if (!rc &&
479 device->state == DASD_STATE_KNOWN &&
480 device->target >= DASD_STATE_BASIC)
481 rc = dasd_state_known_to_basic(device);
482
483 if (!rc &&
484 device->state == DASD_STATE_BASIC &&
485 device->target >= DASD_STATE_READY)
486 rc = dasd_state_basic_to_ready(device);
487
39ccf95e
HH		 488 if (!rc &&
489 device->state == DASD_STATE_UNFMT &&
490 device->target > DASD_STATE_UNFMT)
491 rc = -EPERM;
492
1da177e4
LT		 493 if (!rc &&
494 device->state == DASD_STATE_READY &&
495 device->target >= DASD_STATE_ONLINE)
496 rc = dasd_state_ready_to_online(device);
497
498 return rc;
499}
500
501/*
502 * Device shutdown state changes.
503 */
8e09f215 504static int dasd_decrease_state(struct dasd_device *device)
1da177e4 505{
8f61701b
HH		 506 int rc;
507
508 rc = 0;
1da177e4
LT		 509 if (device->state == DASD_STATE_ONLINE &&
510 device->target <= DASD_STATE_READY)
8f61701b 511 rc = dasd_state_online_to_ready(device);
138c014d 512
8f61701b
HH		 513 if (!rc &&
514 device->state == DASD_STATE_READY &&
1da177e4 515 device->target <= DASD_STATE_BASIC)
8f61701b 516 rc = dasd_state_ready_to_basic(device);
90f0094d 517
8f61701b
HH		 518 if (!rc &&
519 device->state == DASD_STATE_UNFMT &&
90f0094d 520 device->target <= DASD_STATE_BASIC)
8f61701b 521 rc = dasd_state_unfmt_to_basic(device);
90f0094d 522
8f61701b
HH		 523 if (!rc &&
524 device->state == DASD_STATE_BASIC &&
1da177e4 525 device->target <= DASD_STATE_KNOWN)
8f61701b 526 rc = dasd_state_basic_to_known(device);
138c014d 527
8f61701b
HH		 528 if (!rc &&
529 device->state == DASD_STATE_KNOWN &&
1da177e4 530 device->target <= DASD_STATE_NEW)
8f61701b 531 rc = dasd_state_known_to_new(device);
1da177e4 532
8f61701b 533 return rc;
1da177e4
LT		 534}
535
536/*
537 * This is the main startup/shutdown routine.
538 */
8e09f215 539static void dasd_change_state(struct dasd_device *device)
1da177e4 540{
181d9522 541 int rc;
1da177e4
LT		 542
543 if (device->state == device->target)
544 /* Already where we want to go today... */
545 return;
546 if (device->state < device->target)
547 rc = dasd_increase_state(device);
548 else
549 rc = dasd_decrease_state(device);
181d9522
SO		 550 if (rc == -EAGAIN)
551 return;
552 if (rc)
553 device->target = device->state;
1da177e4 554
4dfd5c45
HH		 555 /* let user-space know that the device status changed */
556 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
1f08be80
SO		 557
558 if (device->state == device->target)
559 wake_up(&dasd_init_waitq);
1da177e4
LT		 560}
561
562/*
563 * Kick starter for devices that did not complete the startup/shutdown
564 * procedure or were sleeping because of a pending state.
565 * dasd_kick_device will schedule a call do do_kick_device to the kernel
566 * event daemon.
567 */
8e09f215 568static void do_kick_device(struct work_struct *work)
1da177e4 569{
4927b3f7 570 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
9eb25122 571 mutex_lock(&device->state_mutex);
1da177e4 572 dasd_change_state(device);
9eb25122 573 mutex_unlock(&device->state_mutex);
8e09f215 574 dasd_schedule_device_bh(device);
1da177e4
LT		 575 dasd_put_device(device);
576}
577
8e09f215 578void dasd_kick_device(struct dasd_device *device)
1da177e4
LT		 579{
580 dasd_get_device(device);
581 /* queue call to dasd_kick_device to the kernel event daemon. */
582 schedule_work(&device->kick_work);
583}
7048a2b5 584EXPORT_SYMBOL(dasd_kick_device);
1da177e4 585
501183f2
SH		 586/*
587 * dasd_reload_device will schedule a call do do_reload_device to the kernel
588 * event daemon.
589 */
590static void do_reload_device(struct work_struct *work)
591{
592 struct dasd_device *device = container_of(work, struct dasd_device,
593 reload_device);
594 device->discipline->reload(device);
595 dasd_put_device(device);
596}
597
598void dasd_reload_device(struct dasd_device *device)
599{
600 dasd_get_device(device);
601 /* queue call to dasd_reload_device to the kernel event daemon. */
602 schedule_work(&device->reload_device);
603}
604EXPORT_SYMBOL(dasd_reload_device);
605
d41dd122
SH		 606/*
607 * dasd_restore_device will schedule a call do do_restore_device to the kernel
608 * event daemon.
609 */
610static void do_restore_device(struct work_struct *work)
611{
612 struct dasd_device *device = container_of(work, struct dasd_device,
613 restore_device);
614 device->cdev->drv->restore(device->cdev);
615 dasd_put_device(device);
616}
617
618void dasd_restore_device(struct dasd_device *device)
619{
620 dasd_get_device(device);
621 /* queue call to dasd_restore_device to the kernel event daemon. */
622 schedule_work(&device->restore_device);
623}
624
1da177e4
LT		 625/*
626 * Set the target state for a device and starts the state change.
627 */
8e09f215 628void dasd_set_target_state(struct dasd_device *device, int target)
1da177e4 629{
f3445a1a 630 dasd_get_device(device);
9eb25122 631 mutex_lock(&device->state_mutex);
1da177e4
LT		 632 /* If we are in probeonly mode stop at DASD_STATE_READY. */
633 if (dasd_probeonly && target > DASD_STATE_READY)
634 target = DASD_STATE_READY;
635 if (device->target != target) {
9eb25122 636 if (device->state == target)
1da177e4
LT		 637 wake_up(&dasd_init_waitq);
638 device->target = target;
639 }
640 if (device->state != device->target)
641 dasd_change_state(device);
9eb25122
SH		 642 mutex_unlock(&device->state_mutex);
643 dasd_put_device(device);
1da177e4 644}
7048a2b5 645EXPORT_SYMBOL(dasd_set_target_state);
1da177e4
LT		 646
647/*
648 * Enable devices with device numbers in [from..to].
649 */
8e09f215 650static inline int _wait_for_device(struct dasd_device *device)
1da177e4
LT		 651{
652 return (device->state == device->target);
653}
654
8e09f215 655void dasd_enable_device(struct dasd_device *device)
1da177e4
LT		 656{
657 dasd_set_target_state(device, DASD_STATE_ONLINE);
658 if (device->state <= DASD_STATE_KNOWN)
659 /* No discipline for device found. */
660 dasd_set_target_state(device, DASD_STATE_NEW);
661 /* Now wait for the devices to come up. */
662 wait_event(dasd_init_waitq, _wait_for_device(device));
25e2cf1c
SH		 663
664 dasd_reload_device(device);
665 if (device->discipline->kick_validate)
666 device->discipline->kick_validate(device);
1da177e4 667}
7048a2b5 668EXPORT_SYMBOL(dasd_enable_device);
1da177e4
LT		 669
670/*
671 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
672 */
1da177e4 673
4fa52aa7 674unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
1da177e4 675
4fa52aa7 676#ifdef CONFIG_DASD_PROFILE
8ea55c95 677struct dasd_profile dasd_global_profile = {
8ea55c95
SO		 678 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock),
679};
4fa52aa7 680static struct dentry *dasd_debugfs_global_entry;
1da177e4
LT		 681
682/*
683 * Add profiling information for cqr before execution.
684 */
8e09f215
SW		 685static void dasd_profile_start(struct dasd_block *block,
686 struct dasd_ccw_req *cqr,
687 struct request *req)
1da177e4
LT		 688{
689 struct list_head *l;
690 unsigned int counter;
4fa52aa7 691 struct dasd_device *device;
1da177e4
LT		 692
693 /* count the length of the chanq for statistics */
694 counter = 0;
4fa52aa7
SW		 695 if (dasd_global_profile_level || block->profile.data)
696 list_for_each(l, &block->ccw_queue)
697 if (++counter >= 31)
698 break;
699
8ea55c95 700 spin_lock(&dasd_global_profile.lock);
6765cc2a 701 if (dasd_global_profile.data) {
8ea55c95 702 dasd_global_profile.data->dasd_io_nr_req[counter]++;
4fa52aa7 703 if (rq_data_dir(req) == READ)
8ea55c95 704 dasd_global_profile.data->dasd_read_nr_req[counter]++;
4fa52aa7 705 }
8ea55c95 706 spin_unlock(&dasd_global_profile.lock);
4fa52aa7
SW		 707
708 spin_lock(&block->profile.lock);
c81a90c8 709 if (block->profile.data) {
4fa52aa7
SW		 710 block->profile.data->dasd_io_nr_req[counter]++;
711 if (rq_data_dir(req) == READ)
712 block->profile.data->dasd_read_nr_req[counter]++;
c81a90c8 713 }
4fa52aa7
SW		 714 spin_unlock(&block->profile.lock);
715
716 /*
717 * We count the request for the start device, even though it may run on
718 * some other device due to error recovery. This way we make sure that
719 * we count each request only once.
720 */
721 device = cqr->startdev;
722 if (device->profile.data) {
723 counter = 1; /* request is not yet queued on the start device */
724 list_for_each(l, &device->ccw_queue)
725 if (++counter >= 31)
726 break;
727 }
728 spin_lock(&device->profile.lock);
729 if (device->profile.data) {
730 device->profile.data->dasd_io_nr_req[counter]++;
731 if (rq_data_dir(req) == READ)
732 device->profile.data->dasd_read_nr_req[counter]++;
733 }
734 spin_unlock(&device->profile.lock);
1da177e4
LT		 735}
736
737/*
738 * Add profiling information for cqr after execution.
739 */
4fa52aa7
SW		 740
741#define dasd_profile_counter(value, index) \
742{ \
743 for (index = 0; index < 31 && value >> (2+index); index++) \
744 ; \
745}
746
747static void dasd_profile_end_add_data(struct dasd_profile_info *data,
748 int is_alias,
749 int is_tpm,
750 int is_read,
751 long sectors,
752 int sectors_ind,
753 int tottime_ind,
754 int tottimeps_ind,
755 int strtime_ind,
756 int irqtime_ind,
757 int irqtimeps_ind,
758 int endtime_ind)
759{
760 /* in case of an overflow, reset the whole profile */
761 if (data->dasd_io_reqs == UINT_MAX) {
762 memset(data, 0, sizeof(*data));
763 getnstimeofday(&data->starttod);
764 }
765 data->dasd_io_reqs++;
766 data->dasd_io_sects += sectors;
767 if (is_alias)
768 data->dasd_io_alias++;
769 if (is_tpm)
770 data->dasd_io_tpm++;
771
772 data->dasd_io_secs[sectors_ind]++;
773 data->dasd_io_times[tottime_ind]++;
774 data->dasd_io_timps[tottimeps_ind]++;
775 data->dasd_io_time1[strtime_ind]++;
776 data->dasd_io_time2[irqtime_ind]++;
777 data->dasd_io_time2ps[irqtimeps_ind]++;
778 data->dasd_io_time3[endtime_ind]++;
779
780 if (is_read) {
781 data->dasd_read_reqs++;
782 data->dasd_read_sects += sectors;
783 if (is_alias)
784 data->dasd_read_alias++;
785 if (is_tpm)
786 data->dasd_read_tpm++;
787 data->dasd_read_secs[sectors_ind]++;
788 data->dasd_read_times[tottime_ind]++;
789 data->dasd_read_time1[strtime_ind]++;
790 data->dasd_read_time2[irqtime_ind]++;
791 data->dasd_read_time3[endtime_ind]++;
792 }
793}
794
8e09f215
SW		 795static void dasd_profile_end(struct dasd_block *block,
796 struct dasd_ccw_req *cqr,
797 struct request *req)
1da177e4
LT		 798{
799 long strtime, irqtime, endtime, tottime; /* in microseconds */
800 long tottimeps, sectors;
4fa52aa7
SW		 801 struct dasd_device *device;
802 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
803 int irqtime_ind, irqtimeps_ind, endtime_ind;
1da177e4 804
4fa52aa7
SW		 805 device = cqr->startdev;
806 if (!(dasd_global_profile_level ||
807 block->profile.data ||
808 device->profile.data))
1da177e4
LT		 809 return;
810
83096ebf 811 sectors = blk_rq_sectors(req);
1da177e4
LT		 812 if (!cqr->buildclk || !cqr->startclk ||
813 !cqr->stopclk || !cqr->endclk ||
814 !sectors)
815 return;
816
817 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
818 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
819 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
820 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
821 tottimeps = tottime / sectors;
822
4fa52aa7
SW		 823 dasd_profile_counter(sectors, sectors_ind);
824 dasd_profile_counter(tottime, tottime_ind);
825 dasd_profile_counter(tottimeps, tottimeps_ind);
826 dasd_profile_counter(strtime, strtime_ind);
827 dasd_profile_counter(irqtime, irqtime_ind);
828 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
829 dasd_profile_counter(endtime, endtime_ind);
830
8ea55c95 831 spin_lock(&dasd_global_profile.lock);
6765cc2a 832 if (dasd_global_profile.data) {
8ea55c95 833 dasd_profile_end_add_data(dasd_global_profile.data,
4fa52aa7
SW		 834 cqr->startdev != block->base,
835 cqr->cpmode == 1,
836 rq_data_dir(req) == READ,
837 sectors, sectors_ind, tottime_ind,
838 tottimeps_ind, strtime_ind,
839 irqtime_ind, irqtimeps_ind,
840 endtime_ind);
841 }
8ea55c95 842 spin_unlock(&dasd_global_profile.lock);
4fa52aa7
SW		 843
844 spin_lock(&block->profile.lock);
845 if (block->profile.data)
846 dasd_profile_end_add_data(block->profile.data,
847 cqr->startdev != block->base,
848 cqr->cpmode == 1,
849 rq_data_dir(req) == READ,
850 sectors, sectors_ind, tottime_ind,
851 tottimeps_ind, strtime_ind,
852 irqtime_ind, irqtimeps_ind,
853 endtime_ind);
854 spin_unlock(&block->profile.lock);
855
856 spin_lock(&device->profile.lock);
857 if (device->profile.data)
858 dasd_profile_end_add_data(device->profile.data,
859 cqr->startdev != block->base,
860 cqr->cpmode == 1,
861 rq_data_dir(req) == READ,
862 sectors, sectors_ind, tottime_ind,
863 tottimeps_ind, strtime_ind,
864 irqtime_ind, irqtimeps_ind,
865 endtime_ind);
866 spin_unlock(&device->profile.lock);
867}
868
869void dasd_profile_reset(struct dasd_profile *profile)
870{
871 struct dasd_profile_info *data;
872
873 spin_lock_bh(&profile->lock);
874 data = profile->data;
875 if (!data) {
876 spin_unlock_bh(&profile->lock);
877 return;
878 }
879 memset(data, 0, sizeof(*data));
880 getnstimeofday(&data->starttod);
881 spin_unlock_bh(&profile->lock);
882}
883
4fa52aa7
SW		 884int dasd_profile_on(struct dasd_profile *profile)
885{
886 struct dasd_profile_info *data;
887
888 data = kzalloc(sizeof(*data), GFP_KERNEL);
889 if (!data)
890 return -ENOMEM;
891 spin_lock_bh(&profile->lock);
892 if (profile->data) {
893 spin_unlock_bh(&profile->lock);
894 kfree(data);
895 return 0;
896 }
897 getnstimeofday(&data->starttod);
898 profile->data = data;
899 spin_unlock_bh(&profile->lock);
900 return 0;
901}
902
903void dasd_profile_off(struct dasd_profile *profile)
904{
905 spin_lock_bh(&profile->lock);
906 kfree(profile->data);
907 profile->data = NULL;
908 spin_unlock_bh(&profile->lock);
909}
910
911char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
912{
913 char *buffer;
914
e4258d55 915 buffer = vmalloc(user_len + 1);
4fa52aa7
SW		 916 if (buffer == NULL)
917 return ERR_PTR(-ENOMEM);
918 if (copy_from_user(buffer, user_buf, user_len) != 0) {
e4258d55 919 vfree(buffer);
4fa52aa7
SW		 920 return ERR_PTR(-EFAULT);
921 }
922 /* got the string, now strip linefeed. */
923 if (buffer[user_len - 1] == '\n')
924 buffer[user_len - 1] = 0;
925 else
926 buffer[user_len] = 0;
927 return buffer;
1da177e4 928}
4fa52aa7
SW		 929
930static ssize_t dasd_stats_write(struct file *file,
931 const char __user *user_buf,
932 size_t user_len, loff_t *pos)
933{
934 char *buffer, *str;
935 int rc;
936 struct seq_file *m = (struct seq_file *)file->private_data;
937 struct dasd_profile *prof = m->private;
938
939 if (user_len > 65536)
940 user_len = 65536;
941 buffer = dasd_get_user_string(user_buf, user_len);
942 if (IS_ERR(buffer))
943 return PTR_ERR(buffer);
944
945 str = skip_spaces(buffer);
946 rc = user_len;
947 if (strncmp(str, "reset", 5) == 0) {
948 dasd_profile_reset(prof);
949 } else if (strncmp(str, "on", 2) == 0) {
950 rc = dasd_profile_on(prof);
6765cc2a
SO		 951 if (rc)
952 goto out;
953 rc = user_len;
954 if (prof == &dasd_global_profile) {
955 dasd_profile_reset(prof);
956 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
957 }
4fa52aa7 958 } else if (strncmp(str, "off", 3) == 0) {
6765cc2a
SO		 959 if (prof == &dasd_global_profile)
960 dasd_global_profile_level = DASD_PROFILE_OFF;
4fa52aa7
SW		 961 dasd_profile_off(prof);
962 } else
963 rc = -EINVAL;
6765cc2a 964out:
e4258d55 965 vfree(buffer);
4fa52aa7
SW		 966 return rc;
967}
968
969static void dasd_stats_array(struct seq_file *m, unsigned int *array)
970{
971 int i;
972
973 for (i = 0; i < 32; i++)
974 seq_printf(m, "%u ", array[i]);
975 seq_putc(m, '\n');
976}
977
978static void dasd_stats_seq_print(struct seq_file *m,
979 struct dasd_profile_info *data)
980{
981 seq_printf(m, "start_time %ld.%09ld\n",
982 data->starttod.tv_sec, data->starttod.tv_nsec);
983 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
984 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
985 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
986 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
c794caf9 987 seq_puts(m, "histogram_sectors ");
4fa52aa7 988 dasd_stats_array(m, data->dasd_io_secs);
c794caf9 989 seq_puts(m, "histogram_io_times ");
4fa52aa7 990 dasd_stats_array(m, data->dasd_io_times);
c794caf9 991 seq_puts(m, "histogram_io_times_weighted ");
4fa52aa7 992 dasd_stats_array(m, data->dasd_io_timps);
c794caf9 993 seq_puts(m, "histogram_time_build_to_ssch ");
4fa52aa7 994 dasd_stats_array(m, data->dasd_io_time1);
c794caf9 995 seq_puts(m, "histogram_time_ssch_to_irq ");
4fa52aa7 996 dasd_stats_array(m, data->dasd_io_time2);
c794caf9 997 seq_puts(m, "histogram_time_ssch_to_irq_weighted ");
4fa52aa7 998 dasd_stats_array(m, data->dasd_io_time2ps);
c794caf9 999 seq_puts(m, "histogram_time_irq_to_end ");
4fa52aa7 1000 dasd_stats_array(m, data->dasd_io_time3);
c794caf9 1001 seq_puts(m, "histogram_ccw_queue_length ");
4fa52aa7
SW		 1002 dasd_stats_array(m, data->dasd_io_nr_req);
1003 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
1004 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
1005 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
1006 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
c794caf9 1007 seq_puts(m, "histogram_read_sectors ");
4fa52aa7 1008 dasd_stats_array(m, data->dasd_read_secs);
c794caf9 1009 seq_puts(m, "histogram_read_times ");
4fa52aa7 1010 dasd_stats_array(m, data->dasd_read_times);
c794caf9 1011 seq_puts(m, "histogram_read_time_build_to_ssch ");
4fa52aa7 1012 dasd_stats_array(m, data->dasd_read_time1);
c794caf9 1013 seq_puts(m, "histogram_read_time_ssch_to_irq ");
4fa52aa7 1014 dasd_stats_array(m, data->dasd_read_time2);
c794caf9 1015 seq_puts(m, "histogram_read_time_irq_to_end ");
4fa52aa7 1016 dasd_stats_array(m, data->dasd_read_time3);
c794caf9 1017 seq_puts(m, "histogram_read_ccw_queue_length ");
4fa52aa7
SW		 1018 dasd_stats_array(m, data->dasd_read_nr_req);
1019}
1020
1021static int dasd_stats_show(struct seq_file *m, void *v)
1022{
1023 struct dasd_profile *profile;
1024 struct dasd_profile_info *data;
1025
1026 profile = m->private;
1027 spin_lock_bh(&profile->lock);
1028 data = profile->data;
1029 if (!data) {
1030 spin_unlock_bh(&profile->lock);
c794caf9 1031 seq_puts(m, "disabled\n");
4fa52aa7
SW		 1032 return 0;
1033 }
1034 dasd_stats_seq_print(m, data);
1035 spin_unlock_bh(&profile->lock);
1036 return 0;
1037}
1038
1039static int dasd_stats_open(struct inode *inode, struct file *file)
1040{
1041 struct dasd_profile *profile = inode->i_private;
1042 return single_open(file, dasd_stats_show, profile);
1043}
1044
1045static const struct file_operations dasd_stats_raw_fops = {
1046 .owner = THIS_MODULE,
1047 .open = dasd_stats_open,
1048 .read = seq_read,
1049 .llseek = seq_lseek,
1050 .release = single_release,
1051 .write = dasd_stats_write,
1052};
1053
4fa52aa7
SW		 1054static void dasd_profile_init(struct dasd_profile *profile,
1055 struct dentry *base_dentry)
1056{
f4ae40a6 1057 umode_t mode;
4fa52aa7
SW		 1058 struct dentry *pde;
1059
1060 if (!base_dentry)
1061 return;
1062 profile->dentry = NULL;
1063 profile->data = NULL;
1064 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1065 pde = debugfs_create_file("statistics", mode, base_dentry,
1066 profile, &dasd_stats_raw_fops);
1067 if (pde && !IS_ERR(pde))
1068 profile->dentry = pde;
1069 return;
1070}
1071
1072static void dasd_profile_exit(struct dasd_profile *profile)
1073{
1074 dasd_profile_off(profile);
d7309aaa
FF		 1075 debugfs_remove(profile->dentry);
1076 profile->dentry = NULL;
4fa52aa7
SW		 1077}
1078
1079static void dasd_statistics_removeroot(void)
1080{
1081 dasd_global_profile_level = DASD_PROFILE_OFF;
6765cc2a 1082 dasd_profile_exit(&dasd_global_profile);
d7309aaa
FF		 1083 debugfs_remove(dasd_debugfs_global_entry);
1084 debugfs_remove(dasd_debugfs_root_entry);
4fa52aa7
SW		 1085}
1086
1087static void dasd_statistics_createroot(void)
1088{
4fa52aa7
SW		 1089 struct dentry *pde;
1090
1091 dasd_debugfs_root_entry = NULL;
4fa52aa7
SW		 1092 pde = debugfs_create_dir("dasd", NULL);
1093 if (!pde || IS_ERR(pde))
1094 goto error;
1095 dasd_debugfs_root_entry = pde;
1096 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1097 if (!pde || IS_ERR(pde))
1098 goto error;
1099 dasd_debugfs_global_entry = pde;
6765cc2a 1100 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry);
4fa52aa7
SW		 1101 return;
1102
1103error:
1104 DBF_EVENT(DBF_ERR, "%s",
1105 "Creation of the dasd debugfs interface failed");
1106 dasd_statistics_removeroot();
1107 return;
1108}
1109
1da177e4 1110#else
8e09f215
SW		 1111#define dasd_profile_start(block, cqr, req) do {} while (0)
1112#define dasd_profile_end(block, cqr, req) do {} while (0)
4fa52aa7
SW		 1113
1114static void dasd_statistics_createroot(void)
1115{
1116 return;
1117}
1118
1119static void dasd_statistics_removeroot(void)
1120{
1121 return;
1122}
1123
1124int dasd_stats_generic_show(struct seq_file *m, void *v)
1125{
c794caf9 1126 seq_puts(m, "Statistics are not activated in this kernel\n");
4fa52aa7
SW		 1127 return 0;
1128}
1129
1130static void dasd_profile_init(struct dasd_profile *profile,
1131 struct dentry *base_dentry)
1132{
1133 return;
1134}
1135
1136static void dasd_profile_exit(struct dasd_profile *profile)
1137{
1138 return;
1139}
1140
1141int dasd_profile_on(struct dasd_profile *profile)
1142{
1143 return 0;
1144}
1145
1da177e4
LT		 1146#endif /* CONFIG_DASD_PROFILE */
1147
1148/*
1149 * Allocate memory for a channel program with 'cplength' channel
1150 * command words and 'datasize' additional space. There are two
1151 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1152 * memory and 2) dasd_smalloc_request uses the static ccw memory
1153 * that gets allocated for each device.
1154 */
68b781fe 1155struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
8e09f215
SW		 1156 int datasize,
1157 struct dasd_device *device)
1da177e4
LT		 1158{
1159 struct dasd_ccw_req *cqr;
1160
1161 /* Sanity checks */
68b781fe 1162 BUG_ON(datasize > PAGE_SIZE ||
7ac1e877 1163 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1da177e4 1164
88abaab4 1165 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1da177e4
LT		 1166 if (cqr == NULL)
1167 return ERR_PTR(-ENOMEM);
1da177e4
LT		 1168 cqr->cpaddr = NULL;
1169 if (cplength > 0) {
88abaab4 1170 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1da177e4
LT		 1171 GFP_ATOMIC | GFP_DMA);
1172 if (cqr->cpaddr == NULL) {
1173 kfree(cqr);
1174 return ERR_PTR(-ENOMEM);
1175 }
1da177e4
LT		 1176 }
1177 cqr->data = NULL;
1178 if (datasize > 0) {
88abaab4 1179 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1da177e4 1180 if (cqr->data == NULL) {
17fd682e 1181 kfree(cqr->cpaddr);
1da177e4
LT		 1182 kfree(cqr);
1183 return ERR_PTR(-ENOMEM);
1184 }
1da177e4 1185 }
68b781fe 1186 cqr->magic = magic;
1da177e4
LT		 1187 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1188 dasd_get_device(device);
1189 return cqr;
1190}
7048a2b5 1191EXPORT_SYMBOL(dasd_kmalloc_request);
1da177e4 1192
68b781fe 1193struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
8e09f215
SW		 1194 int datasize,
1195 struct dasd_device *device)
1da177e4
LT		 1196{
1197 unsigned long flags;
1198 struct dasd_ccw_req *cqr;
1199 char *data;
1200 int size;
1201
1da177e4
LT		 1202 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1203 if (cplength > 0)
1204 size += cplength * sizeof(struct ccw1);
1205 if (datasize > 0)
1206 size += datasize;
1207 spin_lock_irqsave(&device->mem_lock, flags);
1208 cqr = (struct dasd_ccw_req *)
1209 dasd_alloc_chunk(&device->ccw_chunks, size);
1210 spin_unlock_irqrestore(&device->mem_lock, flags);
1211 if (cqr == NULL)
1212 return ERR_PTR(-ENOMEM);
1213 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1214 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1215 cqr->cpaddr = NULL;
1216 if (cplength > 0) {
1217 cqr->cpaddr = (struct ccw1 *) data;
1218 data += cplength*sizeof(struct ccw1);
1219 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1220 }
1221 cqr->data = NULL;
1222 if (datasize > 0) {
1223 cqr->data = data;
1224 memset(cqr->data, 0, datasize);
1225 }
68b781fe 1226 cqr->magic = magic;
1da177e4
LT		 1227 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1228 dasd_get_device(device);
1229 return cqr;
1230}
7048a2b5 1231EXPORT_SYMBOL(dasd_smalloc_request);
1da177e4
LT		 1232
1233/*
1234 * Free memory of a channel program. This function needs to free all the
1235 * idal lists that might have been created by dasd_set_cda and the
1236 * struct dasd_ccw_req itself.
1237 */
8e09f215 1238void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4 1239{
1da177e4
LT		 1240 struct ccw1 *ccw;
1241
1242 /* Clear any idals used for the request. */
1243 ccw = cqr->cpaddr;
1244 do {
1245 clear_normalized_cda(ccw);
1246 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
17fd682e
JJ		 1247 kfree(cqr->cpaddr);
1248 kfree(cqr->data);
1da177e4
LT		 1249 kfree(cqr);
1250 dasd_put_device(device);
1251}
7048a2b5 1252EXPORT_SYMBOL(dasd_kfree_request);
1da177e4 1253
8e09f215 1254void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4
LT		 1255{
1256 unsigned long flags;
1257
1258 spin_lock_irqsave(&device->mem_lock, flags);
1259 dasd_free_chunk(&device->ccw_chunks, cqr);
1260 spin_unlock_irqrestore(&device->mem_lock, flags);
1261 dasd_put_device(device);
1262}
7048a2b5 1263EXPORT_SYMBOL(dasd_sfree_request);
1da177e4
LT		 1264
1265/*
1266 * Check discipline magic in cqr.
1267 */
8e09f215 1268static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1da177e4
LT		 1269{
1270 struct dasd_device *device;
1271
1272 if (cqr == NULL)
1273 return -EINVAL;
8e09f215 1274 device = cqr->startdev;
1da177e4 1275 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
fc19f381 1276 DBF_DEV_EVENT(DBF_WARNING, device,
1da177e4
LT		 1277 " dasd_ccw_req 0x%08x magic doesn't match"
1278 " discipline 0x%08x",
1279 cqr->magic,
1280 *(unsigned int *) device->discipline->name);
1281 return -EINVAL;
1282 }
1283 return 0;
1284}
1285
1286/*
1287 * Terminate the current i/o and set the request to clear_pending.
1288 * Timer keeps device runnig.
1289 * ccw_device_clear can fail if the i/o subsystem
1290 * is in a bad mood.
1291 */
8e09f215 1292int dasd_term_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 1293{
1294 struct dasd_device *device;
1295 int retries, rc;
fc19f381 1296 char errorstring[ERRORLENGTH];
1da177e4
LT		 1297
1298 /* Check the cqr */
1299 rc = dasd_check_cqr(cqr);
1300 if (rc)
1301 return rc;
1302 retries = 0;
8e09f215 1303 device = (struct dasd_device *) cqr->startdev;
1da177e4
LT		 1304 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1305 rc = ccw_device_clear(device->cdev, (long) cqr);
1306 switch (rc) {
1307 case 0: /* termination successful */
8e09f215 1308 cqr->status = DASD_CQR_CLEAR_PENDING;
1aae0560 1309 cqr->stopclk = get_tod_clock();
8f61701b 1310 cqr->starttime = 0;
1da177e4
LT		 1311 DBF_DEV_EVENT(DBF_DEBUG, device,
1312 "terminate cqr %p successful",
1313 cqr);
1314 break;
1315 case -ENODEV:
1316 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1317 "device gone, retry");
1318 break;
1319 case -EIO:
1320 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1321 "I/O error, retry");
1322 break;
1323 case -EINVAL:
2c17124b
SH		 1324 /*
1325 * device not valid so no I/O could be running
1326 * handle CQR as termination successful
1327 */
1328 cqr->status = DASD_CQR_CLEARED;
1329 cqr->stopclk = get_tod_clock();
1330 cqr->starttime = 0;
1331 /* no retries for invalid devices */
1332 cqr->retries = -1;
1333 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1334 "EINVAL, handle as terminated");
1335 /* fake rc to success */
1336 rc = 0;
1337 break;
1da177e4
LT		 1338 case -EBUSY:
1339 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1340 "device busy, retry later");
1341 break;
1342 default:
fc19f381
SH		 1343 /* internal error 10 - unknown rc*/
1344 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1345 dev_err(&device->cdev->dev, "An error occurred in the "
1346 "DASD device driver, reason=%s\n", errorstring);
1da177e4
LT		 1347 BUG();
1348 break;
1349 }
1350 retries++;
1351 }
8e09f215 1352 dasd_schedule_device_bh(device);
1da177e4
LT		 1353 return rc;
1354}
7048a2b5 1355EXPORT_SYMBOL(dasd_term_IO);
1da177e4
LT		 1356
1357/*
1358 * Start the i/o. This start_IO can fail if the channel is really busy.
1359 * In that case set up a timer to start the request later.
1360 */
8e09f215 1361int dasd_start_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 1362{
1363 struct dasd_device *device;
1364 int rc;
fc19f381 1365 char errorstring[ERRORLENGTH];
1da177e4
LT		 1366
1367 /* Check the cqr */
1368 rc = dasd_check_cqr(cqr);
6cc7f168
SW		 1369 if (rc) {
1370 cqr->intrc = rc;
1da177e4 1371 return rc;
6cc7f168 1372 }
8e09f215 1373 device = (struct dasd_device *) cqr->startdev;
5a27e60d
SW		 1374 if (((cqr->block &&
1375 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1376 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1377 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1378 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1379 "because of stolen lock", cqr);
1380 cqr->status = DASD_CQR_ERROR;
1381 cqr->intrc = -EPERM;
1382 return -EPERM;
1383 }
1da177e4 1384 if (cqr->retries < 0) {
fc19f381
SH		 1385 /* internal error 14 - start_IO run out of retries */
1386 sprintf(errorstring, "14 %p", cqr);
1387 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1388 "device driver, reason=%s\n", errorstring);
8e09f215 1389 cqr->status = DASD_CQR_ERROR;
1da177e4
LT		 1390 return -EIO;
1391 }
1aae0560 1392 cqr->startclk = get_tod_clock();
1da177e4
LT		 1393 cqr->starttime = jiffies;
1394 cqr->retries--;
a4d26c6a
SW		 1395 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1396 cqr->lpm &= device->path_data.opm;
1397 if (!cqr->lpm)
1398 cqr->lpm = device->path_data.opm;
1399 }
f3eb5384
SW		 1400 if (cqr->cpmode == 1) {
1401 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1402 (long) cqr, cqr->lpm);
1403 } else {
1404 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1405 (long) cqr, cqr->lpm, 0);
1406 }
1da177e4
LT		 1407 switch (rc) {
1408 case 0:
1409 cqr->status = DASD_CQR_IN_IO;
1da177e4
LT		 1410 break;
1411 case -EBUSY:
a4d26c6a 1412 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 1413 "start_IO: device busy, retry later");
1414 break;
1415 case -ETIMEDOUT:
a4d26c6a 1416 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 1417 "start_IO: request timeout, retry later");
1418 break;
1419 case -EACCES:
a4d26c6a
SW		 1420 /* -EACCES indicates that the request used only a subset of the
1421 * available paths and all these paths are gone. If the lpm of
1422 * this request was only a subset of the opm (e.g. the ppm) then
1423 * we just do a retry with all available paths.
1424 * If we already use the full opm, something is amiss, and we
1425 * need a full path verification.
1da177e4 1426 */
a4d26c6a
SW		 1427 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1428 DBF_DEV_EVENT(DBF_WARNING, device,
1429 "start_IO: selected paths gone (%x)",
1430 cqr->lpm);
1431 } else if (cqr->lpm != device->path_data.opm) {
1432 cqr->lpm = device->path_data.opm;
1433 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1434 "start_IO: selected paths gone,"
1435 " retry on all paths");
1436 } else {
1437 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1438 "start_IO: all paths in opm gone,"
1439 " do path verification");
1440 dasd_generic_last_path_gone(device);
1441 device->path_data.opm = 0;
1442 device->path_data.ppm = 0;
1443 device->path_data.npm = 0;
1444 device->path_data.tbvpm =
1445 ccw_device_get_path_mask(device->cdev);
1446 }
1da177e4
LT		 1447 break;
1448 case -ENODEV:
a4d26c6a 1449 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384
SW		 1450 "start_IO: -ENODEV device gone, retry");
1451 break;
1da177e4 1452 case -EIO:
a4d26c6a 1453 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384 1454 "start_IO: -EIO device gone, retry");
1da177e4 1455 break;
d41dd122
SH		 1456 case -EINVAL:
1457 /* most likely caused in power management context */
a4d26c6a 1458 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
d41dd122
SH		 1459 "start_IO: -EINVAL device currently "
1460 "not accessible");
1461 break;
1da177e4 1462 default:
fc19f381
SH		 1463 /* internal error 11 - unknown rc */
1464 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1465 dev_err(&device->cdev->dev,
1466 "An error occurred in the DASD device driver, "
1467 "reason=%s\n", errorstring);
1da177e4
LT		 1468 BUG();
1469 break;
1470 }
6cc7f168 1471 cqr->intrc = rc;
1da177e4
LT		 1472 return rc;
1473}
7048a2b5 1474EXPORT_SYMBOL(dasd_start_IO);
1da177e4
LT		 1475
1476/*
1477 * Timeout function for dasd devices. This is used for different purposes
1478 * 1) missing interrupt handler for normal operation
1479 * 2) delayed start of request where start_IO failed with -EBUSY
1480 * 3) timeout for missing state change interrupts
1481 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1482 * DASD_CQR_QUEUED for 2) and 3).
1483 */
8e09f215 1484static void dasd_device_timeout(unsigned long ptr)
1da177e4
LT		 1485{
1486 unsigned long flags;
1487 struct dasd_device *device;
1488
1489 device = (struct dasd_device *) ptr;
1490 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1491 /* re-activate request queue */
eb6e199b 1492 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1da177e4 1493 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
8e09f215 1494 dasd_schedule_device_bh(device);
1da177e4
LT		 1495}
1496
1497/*
1498 * Setup timeout for a device in jiffies.
1499 */
8e09f215 1500void dasd_device_set_timer(struct dasd_device *device, int expires)
1da177e4 1501{
48cae885
SW		 1502 if (expires == 0)
1503 del_timer(&device->timer);
1504 else
1505 mod_timer(&device->timer, jiffies + expires);
1da177e4 1506}
7048a2b5 1507EXPORT_SYMBOL(dasd_device_set_timer);
1da177e4
LT		 1508
1509/*
1510 * Clear timeout for a device.
1511 */
8e09f215 1512void dasd_device_clear_timer(struct dasd_device *device)
1da177e4 1513{
48cae885 1514 del_timer(&device->timer);
1da177e4 1515}
7048a2b5 1516EXPORT_SYMBOL(dasd_device_clear_timer);
1da177e4 1517
8e09f215
SW		 1518static void dasd_handle_killed_request(struct ccw_device *cdev,
1519 unsigned long intparm)
1da177e4
LT		 1520{
1521 struct dasd_ccw_req *cqr;
1522 struct dasd_device *device;
1523
f16f5843
SW		 1524 if (!intparm)
1525 return;
1da177e4
LT		 1526 cqr = (struct dasd_ccw_req *) intparm;
1527 if (cqr->status != DASD_CQR_IN_IO) {
b8ed5dd5
SH		 1528 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1529 "invalid status in handle_killed_request: "
1530 "%02x", cqr->status);
1da177e4
LT		 1531 return;
1532 }
1533
589c74d5
SH		 1534 device = dasd_device_from_cdev_locked(cdev);
1535 if (IS_ERR(device)) {
1536 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1537 "unable to get device from cdev");
1538 return;
1539 }
1540
1541 if (!cqr->startdev ||
1542 device != cqr->startdev ||
1543 strncmp(cqr->startdev->discipline->ebcname,
1544 (char *) &cqr->magic, 4)) {
294001a8
SH		 1545 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1546 "invalid device in request");
589c74d5 1547 dasd_put_device(device);
1da177e4
LT		 1548 return;
1549 }
1550
1551 /* Schedule request to be retried. */
1552 cqr->status = DASD_CQR_QUEUED;
1553
8e09f215
SW		 1554 dasd_device_clear_timer(device);
1555 dasd_schedule_device_bh(device);
1da177e4
LT		 1556 dasd_put_device(device);
1557}
1558
8e09f215 1559void dasd_generic_handle_state_change(struct dasd_device *device)
1da177e4 1560{
20c64468
SW		 1561 /* First of all start sense subsystem status request. */
1562 dasd_eer_snss(device);
1563
eb6e199b 1564 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
8e09f215
SW		 1565 dasd_schedule_device_bh(device);
1566 if (device->block)
1567 dasd_schedule_block_bh(device->block);
1da177e4 1568}
7048a2b5 1569EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
1da177e4
LT		 1570
1571/*
1572 * Interrupt handler for "normal" ssch-io based dasd devices.
1573 */
8e09f215
SW		 1574void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1575 struct irb *irb)
1da177e4
LT		 1576{
1577 struct dasd_ccw_req *cqr, *next;
1578 struct dasd_device *device;
1579 unsigned long long now;
1580 int expires;
1da177e4
LT		 1581
1582 if (IS_ERR(irb)) {
1583 switch (PTR_ERR(irb)) {
1584 case -EIO:
1da177e4
LT		 1585 break;
1586 case -ETIMEDOUT:
b8ed5dd5
SH		 1587 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1588 "request timed out\n", __func__);
1da177e4
LT		 1589 break;
1590 default:
b8ed5dd5
SH		 1591 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1592 "unknown error %ld\n", __func__,
1593 PTR_ERR(irb));
1da177e4 1594 }
f16f5843 1595 dasd_handle_killed_request(cdev, intparm);
1da177e4
LT		 1596 return;
1597 }
1598
1aae0560 1599 now = get_tod_clock();
8e09f215 1600 cqr = (struct dasd_ccw_req *) intparm;
5a27e60d
SW		 1601 /* check for conditions that should be handled immediately */
1602 if (!cqr ||
1603 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1604 scsw_cstat(&irb->scsw) == 0)) {
a5a0061f
SW		 1605 if (cqr)
1606 memcpy(&cqr->irb, irb, sizeof(*irb));
a00bfd71 1607 device = dasd_device_from_cdev_locked(cdev);
56b86b61
SH		 1608 if (IS_ERR(device))
1609 return;
1610 /* ignore unsolicited interrupts for DIAG discipline */
1611 if (device->discipline == dasd_diag_discipline_pointer) {
1da177e4 1612 dasd_put_device(device);
56b86b61 1613 return;
1da177e4 1614 }
5a27e60d
SW		 1615 device->discipline->dump_sense_dbf(device, irb, "int");
1616 if (device->features & DASD_FEATURE_ERPLOG)
1617 device->discipline->dump_sense(device, cqr, irb);
1618 device->discipline->check_for_device_change(device, cqr, irb);
56b86b61 1619 dasd_put_device(device);
1da177e4 1620 }
5db8440c
SH		 1621
1622 /* check for for attention message */
1623 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
1624 device = dasd_device_from_cdev_locked(cdev);
1625 device->discipline->check_attention(device, irb->esw.esw1.lpum);
1626 dasd_put_device(device);
1627 }
1628
5a27e60d
SW		 1629 if (!cqr)
1630 return;
1da177e4 1631
8e09f215
SW		 1632 device = (struct dasd_device *) cqr->startdev;
1633 if (!device ||
1da177e4 1634 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
294001a8
SH		 1635 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1636 "invalid device in request");
1da177e4
LT		 1637 return;
1638 }
1639
1640 /* Check for clear pending */
8e09f215 1641 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
f3eb5384 1642 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
8e09f215
SW		 1643 cqr->status = DASD_CQR_CLEARED;
1644 dasd_device_clear_timer(device);
8f61701b 1645 wake_up(&dasd_flush_wq);
8e09f215 1646 dasd_schedule_device_bh(device);
1da177e4
LT		 1647 return;
1648 }
1649
f3eb5384 1650 /* check status - the request might have been killed by dyn detach */
1da177e4 1651 if (cqr->status != DASD_CQR_IN_IO) {
fc19f381
SH		 1652 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1653 "status %02x", dev_name(&cdev->dev), cqr->status);
1da177e4
LT		 1654 return;
1655 }
fc19f381 1656
8e09f215 1657 next = NULL;
1da177e4 1658 expires = 0;
f3eb5384
SW		 1659 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1660 scsw_cstat(&irb->scsw) == 0) {
8e09f215
SW		 1661 /* request was completed successfully */
1662 cqr->status = DASD_CQR_SUCCESS;
1da177e4
LT		 1663 cqr->stopclk = now;
1664 /* Start first request on queue if possible -> fast_io. */
8e09f215
SW		 1665 if (cqr->devlist.next != &device->ccw_queue) {
1666 next = list_entry(cqr->devlist.next,
1667 struct dasd_ccw_req, devlist);
1da177e4 1668 }
8e09f215 1669 } else { /* error */
6c5f57c7
SH		 1670 /*
1671 * If we don't want complex ERP for this request, then just
1672 * reset this and retry it in the fastpath
8e09f215 1673 */
6c5f57c7 1674 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
8e09f215 1675 cqr->retries > 0) {
a4d26c6a 1676 if (cqr->lpm == device->path_data.opm)
fc19f381
SH		 1677 DBF_DEV_EVENT(DBF_DEBUG, device,
1678 "default ERP in fastpath "
1679 "(%i retries left)",
1680 cqr->retries);
a4d26c6a
SW		 1681 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1682 cqr->lpm = device->path_data.opm;
8e09f215
SW		 1683 cqr->status = DASD_CQR_QUEUED;
1684 next = cqr;
1685 } else
1da177e4 1686 cqr->status = DASD_CQR_ERROR;
8e09f215
SW		 1687 }
1688 if (next && (next->status == DASD_CQR_QUEUED) &&
1689 (!device->stopped)) {
1690 if (device->discipline->start_IO(next) == 0)
1691 expires = next->expires;
1da177e4
LT		 1692 }
1693 if (expires != 0)
8e09f215 1694 dasd_device_set_timer(device, expires);
1da177e4 1695 else
8e09f215
SW		 1696 dasd_device_clear_timer(device);
1697 dasd_schedule_device_bh(device);
1da177e4 1698}
7048a2b5 1699EXPORT_SYMBOL(dasd_int_handler);
1da177e4 1700
a23ed009
SH		 1701enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1702{
1703 struct dasd_device *device;
1704
1705 device = dasd_device_from_cdev_locked(cdev);
1706
1707 if (IS_ERR(device))
1708 goto out;
1709 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1710 device->state != device->target ||
5a27e60d 1711 !device->discipline->check_for_device_change){
a23ed009
SH		 1712 dasd_put_device(device);
1713 goto out;
1714 }
5a27e60d
SW		 1715 if (device->discipline->dump_sense_dbf)
1716 device->discipline->dump_sense_dbf(device, irb, "uc");
1717 device->discipline->check_for_device_change(device, NULL, irb);
a23ed009
SH		 1718 dasd_put_device(device);
1719out:
1720 return UC_TODO_RETRY;
1721}
1722EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1723
1da177e4 1724/*
8e09f215
SW		 1725 * If we have an error on a dasd_block layer request then we cancel
1726 * and return all further requests from the same dasd_block as well.
1da177e4 1727 */
8e09f215
SW		 1728static void __dasd_device_recovery(struct dasd_device *device,
1729 struct dasd_ccw_req *ref_cqr)
1da177e4 1730{
8e09f215
SW		 1731 struct list_head *l, *n;
1732 struct dasd_ccw_req *cqr;
1da177e4 1733
8e09f215
SW		 1734 /*
1735 * only requeue request that came from the dasd_block layer
1736 */
1737 if (!ref_cqr->block)
1738 return;
1da177e4 1739
8e09f215
SW		 1740 list_for_each_safe(l, n, &device->ccw_queue) {
1741 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1742 if (cqr->status == DASD_CQR_QUEUED &&
1743 ref_cqr->block == cqr->block) {
1744 cqr->status = DASD_CQR_CLEARED;
1745 }
1746 }
1747};
1da177e4
LT		 1748
1749/*
8e09f215
SW		 1750 * Remove those ccw requests from the queue that need to be returned
1751 * to the upper layer.
1da177e4 1752 */
8e09f215
SW		 1753static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1754 struct list_head *final_queue)
1da177e4
LT		 1755{
1756 struct list_head *l, *n;
1757 struct dasd_ccw_req *cqr;
1da177e4 1758
1da177e4
LT		 1759 /* Process request with final status. */
1760 list_for_each_safe(l, n, &device->ccw_queue) {
8e09f215
SW		 1761 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1762
1fbdb8be 1763 /* Skip any non-final request. */
8e09f215
SW		 1764 if (cqr->status == DASD_CQR_QUEUED ||
1765 cqr->status == DASD_CQR_IN_IO ||
1766 cqr->status == DASD_CQR_CLEAR_PENDING)
1fbdb8be 1767 continue;
1da177e4 1768 if (cqr->status == DASD_CQR_ERROR) {
8e09f215 1769 __dasd_device_recovery(device, cqr);
20c64468 1770 }
1da177e4 1771 /* Rechain finished requests to final queue */
8e09f215 1772 list_move_tail(&cqr->devlist, final_queue);
1da177e4
LT		 1773 }
1774}
1775
1da177e4 1776/*
8e09f215
SW		 1777 * the cqrs from the final queue are returned to the upper layer
1778 * by setting a dasd_block state and calling the callback function
1da177e4 1779 */
8e09f215
SW		 1780static void __dasd_device_process_final_queue(struct dasd_device *device,
1781 struct list_head *final_queue)
1da177e4 1782{
8e09f215 1783 struct list_head *l, *n;
1da177e4 1784 struct dasd_ccw_req *cqr;
03513bcc 1785 struct dasd_block *block;
c80ee724
SH		 1786 void (*callback)(struct dasd_ccw_req *, void *data);
1787 void *callback_data;
fc19f381 1788 char errorstring[ERRORLENGTH];
f24acd45 1789
8e09f215
SW		 1790 list_for_each_safe(l, n, final_queue) {
1791 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1792 list_del_init(&cqr->devlist);
03513bcc 1793 block = cqr->block;
c80ee724
SH		 1794 callback = cqr->callback;
1795 callback_data = cqr->callback_data;
03513bcc
SW		 1796 if (block)
1797 spin_lock_bh(&block->queue_lock);
8e09f215
SW		 1798 switch (cqr->status) {
1799 case DASD_CQR_SUCCESS:
1800 cqr->status = DASD_CQR_DONE;
1801 break;
1802 case DASD_CQR_ERROR:
1803 cqr->status = DASD_CQR_NEED_ERP;
1804 break;
1805 case DASD_CQR_CLEARED:
1806 cqr->status = DASD_CQR_TERMINATED;
1807 break;
1808 default:
fc19f381
SH		 1809 /* internal error 12 - wrong cqr status*/
1810 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1811 dev_err(&device->cdev->dev,
1812 "An error occurred in the DASD device driver, "
1813 "reason=%s\n", errorstring);
8e09f215 1814 BUG();
1da177e4 1815 }
8e09f215 1816 if (cqr->callback != NULL)
c80ee724 1817 (callback)(cqr, callback_data);
03513bcc
SW		 1818 if (block)
1819 spin_unlock_bh(&block->queue_lock);
1da177e4
LT		 1820 }
1821}
1822
1823/*
1824 * Take a look at the first request on the ccw queue and check
1825 * if it reached its expire time. If so, terminate the IO.
1826 */
8e09f215 1827static void __dasd_device_check_expire(struct dasd_device *device)
1da177e4
LT		 1828{
1829 struct dasd_ccw_req *cqr;
1830
1831 if (list_empty(&device->ccw_queue))
1832 return;
8e09f215 1833 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
29145a6c
HH		 1834 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1835 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
d07dc5d8
SH		 1836 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1837 /*
1838 * IO in safe offline processing should not
1839 * run out of retries
1840 */
1841 cqr->retries++;
1842 }
29145a6c
HH		 1843 if (device->discipline->term_IO(cqr) != 0) {
1844 /* Hmpf, try again in 5 sec */
fc19f381 1845 dev_err(&device->cdev->dev,
625c94df 1846 "cqr %p timed out (%lus) but cannot be "
fc19f381
SH		 1847 "ended, retrying in 5 s\n",
1848 cqr, (cqr->expires/HZ));
7dc1da9f
SH		 1849 cqr->expires += 5*HZ;
1850 dasd_device_set_timer(device, 5*HZ);
29145a6c 1851 } else {
fc19f381 1852 dev_err(&device->cdev->dev,
625c94df 1853 "cqr %p timed out (%lus), %i retries "
fc19f381
SH		 1854 "remaining\n", cqr, (cqr->expires/HZ),
1855 cqr->retries);
1da177e4
LT		 1856 }
1857 }
1858}
1859
1860/*
1861 * Take a look at the first request on the ccw queue and check
1862 * if it needs to be started.
1863 */
8e09f215 1864static void __dasd_device_start_head(struct dasd_device *device)
1da177e4
LT		 1865{
1866 struct dasd_ccw_req *cqr;
1867 int rc;
1868
1869 if (list_empty(&device->ccw_queue))
1870 return;
8e09f215 1871 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
25ee4cf8
PO		 1872 if (cqr->status != DASD_CQR_QUEUED)
1873 return;
a4d26c6a
SW		 1874 /* when device is stopped, return request to previous layer
1875 * exception: only the disconnect or unresumed bits are set and the
1876 * cqr is a path verification request
1877 */
1878 if (device->stopped &&
1879 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1880 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1881 cqr->intrc = -EAGAIN;
8e09f215
SW		 1882 cqr->status = DASD_CQR_CLEARED;
1883 dasd_schedule_device_bh(device);
25ee4cf8 1884 return;
1c01b8a5 1885 }
25ee4cf8
PO		 1886
1887 rc = device->discipline->start_IO(cqr);
1888 if (rc == 0)
8e09f215 1889 dasd_device_set_timer(device, cqr->expires);
25ee4cf8 1890 else if (rc == -EACCES) {
8e09f215 1891 dasd_schedule_device_bh(device);
25ee4cf8
PO		 1892 } else
1893 /* Hmpf, try again in 1/2 sec */
8e09f215 1894 dasd_device_set_timer(device, 50);
8f61701b
HH		 1895}
1896
a4d26c6a
SW		 1897static void __dasd_device_check_path_events(struct dasd_device *device)
1898{
1899 int rc;
1900
1901 if (device->path_data.tbvpm) {
1902 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1903 DASD_UNRESUMED_PM))
1904 return;
1905 rc = device->discipline->verify_path(
1906 device, device->path_data.tbvpm);
1907 if (rc)
1908 dasd_device_set_timer(device, 50);
1909 else
1910 device->path_data.tbvpm = 0;
1911 }
1912};
1913
1da177e4 1914/*
8e09f215
SW		 1915 * Go through all request on the dasd_device request queue,
1916 * terminate them on the cdev if necessary, and return them to the
1917 * submitting layer via callback.
1918 * Note:
1919 * Make sure that all 'submitting layers' still exist when
1920 * this function is called!. In other words, when 'device' is a base
1921 * device then all block layer requests must have been removed before
1922 * via dasd_flush_block_queue.
1da177e4 1923 */
8e09f215 1924int dasd_flush_device_queue(struct dasd_device *device)
1da177e4 1925{
8e09f215
SW		 1926 struct dasd_ccw_req *cqr, *n;
1927 int rc;
1da177e4 1928 struct list_head flush_queue;
1da177e4
LT		 1929
1930 INIT_LIST_HEAD(&flush_queue);
1931 spin_lock_irq(get_ccwdev_lock(device->cdev));
8f61701b 1932 rc = 0;
8e09f215 1933 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
8f61701b
HH		 1934 /* Check status and move request to flush_queue */
1935 switch (cqr->status) {
1936 case DASD_CQR_IN_IO:
1937 rc = device->discipline->term_IO(cqr);
1938 if (rc) {
1939 /* unable to terminate requeust */
fc19f381
SH		 1940 dev_err(&device->cdev->dev,
1941 "Flushing the DASD request queue "
1942 "failed for request %p\n", cqr);
8f61701b
HH		 1943 /* stop flush processing */
1944 goto finished;
1945 }
1946 break;
1947 case DASD_CQR_QUEUED:
1aae0560 1948 cqr->stopclk = get_tod_clock();
8e09f215 1949 cqr->status = DASD_CQR_CLEARED;
8f61701b 1950 break;
8e09f215 1951 default: /* no need to modify the others */
8f61701b
HH		 1952 break;
1953 }
8e09f215 1954 list_move_tail(&cqr->devlist, &flush_queue);
8f61701b 1955 }
8f61701b
HH		 1956finished:
1957 spin_unlock_irq(get_ccwdev_lock(device->cdev));
8e09f215
SW		 1958 /*
1959 * After this point all requests must be in state CLEAR_PENDING,
1960 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1961 * one of the others.
1962 */
1963 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1964 wait_event(dasd_flush_wq,
1965 (cqr->status != DASD_CQR_CLEAR_PENDING));
1966 /*
1967 * Now set each request back to TERMINATED, DONE or NEED_ERP
1968 * and call the callback function of flushed requests
1969 */
1970 __dasd_device_process_final_queue(device, &flush_queue);
8f61701b 1971 return rc;
1da177e4 1972}
7048a2b5 1973EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
1da177e4
LT		 1974
1975/*
1976 * Acquire the device lock and process queues for the device.
1977 */
8e09f215 1978static void dasd_device_tasklet(struct dasd_device *device)
1da177e4
LT		 1979{
1980 struct list_head final_queue;
1da177e4
LT		 1981
1982 atomic_set (&device->tasklet_scheduled, 0);
1983 INIT_LIST_HEAD(&final_queue);
1984 spin_lock_irq(get_ccwdev_lock(device->cdev));
1985 /* Check expire time of first request on the ccw queue. */
8e09f215
SW		 1986 __dasd_device_check_expire(device);
1987 /* find final requests on ccw queue */
1988 __dasd_device_process_ccw_queue(device, &final_queue);
a4d26c6a 1989 __dasd_device_check_path_events(device);
1da177e4
LT		 1990 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1991 /* Now call the callback function of requests with final status */
8e09f215
SW		 1992 __dasd_device_process_final_queue(device, &final_queue);
1993 spin_lock_irq(get_ccwdev_lock(device->cdev));
1da177e4 1994 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 1995 __dasd_device_start_head(device);
1996 spin_unlock_irq(get_ccwdev_lock(device->cdev));
4679e893
SH		 1997 if (waitqueue_active(&shutdown_waitq))
1998 wake_up(&shutdown_waitq);
1da177e4
LT		 1999 dasd_put_device(device);
2000}
2001
2002/*
2003 * Schedules a call to dasd_tasklet over the device tasklet.
2004 */
8e09f215 2005void dasd_schedule_device_bh(struct dasd_device *device)
1da177e4
LT		 2006{
2007 /* Protect against rescheduling. */
973bd993 2008 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1da177e4
LT		 2009 return;
2010 dasd_get_device(device);
2011 tasklet_hi_schedule(&device->tasklet);
2012}
7048a2b5 2013EXPORT_SYMBOL(dasd_schedule_device_bh);
1da177e4 2014
eb6e199b
SW		 2015void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2016{
2017 device->stopped |= bits;
2018}
2019EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2020
2021void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2022{
2023 device->stopped &= ~bits;
2024 if (!device->stopped)
2025 wake_up(&generic_waitq);
2026}
2027EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2028
1da177e4 2029/*
8e09f215
SW		 2030 * Queue a request to the head of the device ccw_queue.
2031 * Start the I/O if possible.
1da177e4 2032 */
8e09f215 2033void dasd_add_request_head(struct dasd_ccw_req *cqr)
1da177e4
LT		 2034{
2035 struct dasd_device *device;
2036 unsigned long flags;
2037
8e09f215 2038 device = cqr->startdev;
1da177e4 2039 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 2040 cqr->status = DASD_CQR_QUEUED;
2041 list_add(&cqr->devlist, &device->ccw_queue);
1da177e4 2042 /* let the bh start the request to keep them in order */
8e09f215 2043 dasd_schedule_device_bh(device);
1da177e4
LT		 2044 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2045}
7048a2b5 2046EXPORT_SYMBOL(dasd_add_request_head);
1da177e4
LT		 2047
2048/*
8e09f215
SW		 2049 * Queue a request to the tail of the device ccw_queue.
2050 * Start the I/O if possible.
1da177e4 2051 */
8e09f215 2052void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1da177e4
LT		 2053{
2054 struct dasd_device *device;
2055 unsigned long flags;
2056
8e09f215 2057 device = cqr->startdev;
1da177e4 2058 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 2059 cqr->status = DASD_CQR_QUEUED;
2060 list_add_tail(&cqr->devlist, &device->ccw_queue);
1da177e4 2061 /* let the bh start the request to keep them in order */
8e09f215 2062 dasd_schedule_device_bh(device);
1da177e4
LT		 2063 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2064}
7048a2b5 2065EXPORT_SYMBOL(dasd_add_request_tail);
1da177e4
LT		 2066
2067/*
8e09f215 2068 * Wakeup helper for the 'sleep_on' functions.
1da177e4 2069 */
5915a873 2070void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1da177e4 2071{
1c1e093c
SW		 2072 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2073 cqr->callback_data = DASD_SLEEPON_END_TAG;
2074 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2075 wake_up(&generic_waitq);
1da177e4 2076}
5915a873 2077EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
1da177e4 2078
8e09f215 2079static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1da177e4
LT		 2080{
2081 struct dasd_device *device;
2082 int rc;
2083
8e09f215 2084 device = cqr->startdev;
1da177e4 2085 spin_lock_irq(get_ccwdev_lock(device->cdev));
1c1e093c 2086 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
1da177e4
LT		 2087 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2088 return rc;
2089}
2090
2091/*
eb6e199b 2092 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1da177e4 2093 */
eb6e199b 2094static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1da177e4 2095{
1da177e4 2096 struct dasd_device *device;
eb6e199b 2097 dasd_erp_fn_t erp_fn;
138c014d 2098
eb6e199b
SW		 2099 if (cqr->status == DASD_CQR_FILLED)
2100 return 0;
8e09f215 2101 device = cqr->startdev;
eb6e199b
SW		 2102 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2103 if (cqr->status == DASD_CQR_TERMINATED) {
2104 device->discipline->handle_terminated_request(cqr);
2105 return 1;
2106 }
2107 if (cqr->status == DASD_CQR_NEED_ERP) {
2108 erp_fn = device->discipline->erp_action(cqr);
2109 erp_fn(cqr);
2110 return 1;
2111 }
2112 if (cqr->status == DASD_CQR_FAILED)
2113 dasd_log_sense(cqr, &cqr->irb);
2114 if (cqr->refers) {
2115 __dasd_process_erp(device, cqr);
2116 return 1;
2117 }
2118 }
2119 return 0;
2120}
138c014d 2121
eb6e199b
SW		 2122static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2123{
2124 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2125 if (cqr->refers) /* erp is not done yet */
2126 return 1;
2127 return ((cqr->status != DASD_CQR_DONE) &&
2128 (cqr->status != DASD_CQR_FAILED));
2129 } else
2130 return (cqr->status == DASD_CQR_FILLED);
2131}
138c014d 2132
eb6e199b
SW		 2133static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2134{
2135 struct dasd_device *device;
2136 int rc;
2137 struct list_head ccw_queue;
2138 struct dasd_ccw_req *cqr;
2139
2140 INIT_LIST_HEAD(&ccw_queue);
2141 maincqr->status = DASD_CQR_FILLED;
2142 device = maincqr->startdev;
2143 list_add(&maincqr->blocklist, &ccw_queue);
2144 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2145 cqr = list_first_entry(&ccw_queue,
2146 struct dasd_ccw_req, blocklist)) {
2147
2148 if (__dasd_sleep_on_erp(cqr))
2149 continue;
2150 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2151 continue;
5a27e60d
SW		 2152 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2153 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2154 cqr->status = DASD_CQR_FAILED;
2155 cqr->intrc = -EPERM;
2156 continue;
2157 }
eb6e199b
SW		 2158 /* Non-temporary stop condition will trigger fail fast */
2159 if (device->stopped & ~DASD_STOPPED_PENDING &&
2160 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2161 (!dasd_eer_enabled(device))) {
2162 cqr->status = DASD_CQR_FAILED;
d1ffc1f8 2163 cqr->intrc = -ENOLINK;
eb6e199b
SW		 2164 continue;
2165 }
eb6e199b
SW		 2166 /* Don't try to start requests if device is stopped */
2167 if (interruptible) {
2168 rc = wait_event_interruptible(
2169 generic_waitq, !(device->stopped));
2170 if (rc == -ERESTARTSYS) {
2171 cqr->status = DASD_CQR_FAILED;
2172 maincqr->intrc = rc;
2173 continue;
2174 }
2175 } else
2176 wait_event(generic_waitq, !(device->stopped));
2177
5915a873
SH		 2178 if (!cqr->callback)
2179 cqr->callback = dasd_wakeup_cb;
2180
1c1e093c 2181 cqr->callback_data = DASD_SLEEPON_START_TAG;
eb6e199b
SW		 2182 dasd_add_request_tail(cqr);
2183 if (interruptible) {
2184 rc = wait_event_interruptible(
2185 generic_waitq, _wait_for_wakeup(cqr));
2186 if (rc == -ERESTARTSYS) {
2187 dasd_cancel_req(cqr);
2188 /* wait (non-interruptible) for final status */
2189 wait_event(generic_waitq,
2190 _wait_for_wakeup(cqr));
2191 cqr->status = DASD_CQR_FAILED;
2192 maincqr->intrc = rc;
2193 continue;
2194 }
2195 } else
2196 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2197 }
2198
1aae0560 2199 maincqr->endclk = get_tod_clock();
eb6e199b
SW		 2200 if ((maincqr->status != DASD_CQR_DONE) &&
2201 (maincqr->intrc != -ERESTARTSYS))
2202 dasd_log_sense(maincqr, &maincqr->irb);
2203 if (maincqr->status == DASD_CQR_DONE)
6cc7f168 2204 rc = 0;
eb6e199b
SW		 2205 else if (maincqr->intrc)
2206 rc = maincqr->intrc;
6cc7f168
SW		 2207 else
2208 rc = -EIO;
1da177e4
LT		 2209 return rc;
2210}
2211
d42e1712
SH		 2212static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2213{
2214 struct dasd_ccw_req *cqr;
2215
2216 list_for_each_entry(cqr, ccw_queue, blocklist) {
2217 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2218 return 0;
2219 }
2220
2221 return 1;
2222}
2223
2224static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2225{
2226 struct dasd_device *device;
d42e1712 2227 struct dasd_ccw_req *cqr, *n;
362ce84f 2228 int rc;
d42e1712
SH		 2229
2230retry:
2231 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2232 device = cqr->startdev;
2233 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2234 continue;
2235
2236 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2237 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2238 cqr->status = DASD_CQR_FAILED;
2239 cqr->intrc = -EPERM;
2240 continue;
2241 }
2242 /*Non-temporary stop condition will trigger fail fast*/
2243 if (device->stopped & ~DASD_STOPPED_PENDING &&
2244 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2245 !dasd_eer_enabled(device)) {
2246 cqr->status = DASD_CQR_FAILED;
2247 cqr->intrc = -EAGAIN;
2248 continue;
2249 }
2250
2251 /*Don't try to start requests if device is stopped*/
2252 if (interruptible) {
2253 rc = wait_event_interruptible(
2254 generic_waitq, !device->stopped);
2255 if (rc == -ERESTARTSYS) {
2256 cqr->status = DASD_CQR_FAILED;
2257 cqr->intrc = rc;
2258 continue;
2259 }
2260 } else
2261 wait_event(generic_waitq, !(device->stopped));
2262
2263 if (!cqr->callback)
2264 cqr->callback = dasd_wakeup_cb;
2265 cqr->callback_data = DASD_SLEEPON_START_TAG;
2266 dasd_add_request_tail(cqr);
2267 }
2268
2269 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2270
2271 rc = 0;
2272 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
29b8dd9d
SH		 2273 /*
2274 * for alias devices simplify error recovery and
2275 * return to upper layer
362ce84f 2276 * do not skip ERP requests
29b8dd9d 2277 */
362ce84f 2278 if (cqr->startdev != cqr->basedev && !cqr->refers &&
29b8dd9d
SH		 2279 (cqr->status == DASD_CQR_TERMINATED ||
2280 cqr->status == DASD_CQR_NEED_ERP))
2281 return -EAGAIN;
362ce84f
SH		 2282
2283 /* normal recovery for basedev IO */
590aeedd
SH		 2284 if (__dasd_sleep_on_erp(cqr))
2285 /* handle erp first */
362ce84f 2286 goto retry;
d42e1712 2287 }
362ce84f 2288
d42e1712
SH		 2289 return 0;
2290}
2291
eb6e199b
SW		 2292/*
2293 * Queue a request to the tail of the device ccw_queue and wait for
2294 * it's completion.
2295 */
2296int dasd_sleep_on(struct dasd_ccw_req *cqr)
2297{
2298 return _dasd_sleep_on(cqr, 0);
2299}
7048a2b5 2300EXPORT_SYMBOL(dasd_sleep_on);
eb6e199b 2301
d42e1712
SH		 2302/*
2303 * Start requests from a ccw_queue and wait for their completion.
2304 */
2305int dasd_sleep_on_queue(struct list_head *ccw_queue)
2306{
2307 return _dasd_sleep_on_queue(ccw_queue, 0);
2308}
2309EXPORT_SYMBOL(dasd_sleep_on_queue);
2310
1da177e4 2311/*
8e09f215
SW		 2312 * Queue a request to the tail of the device ccw_queue and wait
2313 * interruptible for it's completion.
1da177e4 2314 */
8e09f215 2315int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1da177e4 2316{
eb6e199b 2317 return _dasd_sleep_on(cqr, 1);
1da177e4 2318}
7048a2b5 2319EXPORT_SYMBOL(dasd_sleep_on_interruptible);
1da177e4
LT		 2320
2321/*
2322 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2323 * for eckd devices) the currently running request has to be terminated
2324 * and be put back to status queued, before the special request is added
2325 * to the head of the queue. Then the special request is waited on normally.
2326 */
8e09f215 2327static inline int _dasd_term_running_cqr(struct dasd_device *device)
1da177e4
LT		 2328{
2329 struct dasd_ccw_req *cqr;
aade6c0d 2330 int rc;
1da177e4
LT		 2331
2332 if (list_empty(&device->ccw_queue))
2333 return 0;
8e09f215 2334 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
aade6c0d
SH		 2335 rc = device->discipline->term_IO(cqr);
2336 if (!rc)
2337 /*
2338 * CQR terminated because a more important request is pending.
2339 * Undo decreasing of retry counter because this is
2340 * not an error case.
2341 */
2342 cqr->retries++;
2343 return rc;
1da177e4
LT		 2344}
2345
8e09f215 2346int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1da177e4 2347{
1da177e4
LT		 2348 struct dasd_device *device;
2349 int rc;
138c014d 2350
8e09f215 2351 device = cqr->startdev;
5a27e60d
SW		 2352 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2353 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2354 cqr->status = DASD_CQR_FAILED;
2355 cqr->intrc = -EPERM;
2356 return -EIO;
2357 }
1da177e4
LT		 2358 spin_lock_irq(get_ccwdev_lock(device->cdev));
2359 rc = _dasd_term_running_cqr(device);
2360 if (rc) {
2361 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2362 return rc;
2363 }
1da177e4 2364 cqr->callback = dasd_wakeup_cb;
1c1e093c 2365 cqr->callback_data = DASD_SLEEPON_START_TAG;
1da177e4 2366 cqr->status = DASD_CQR_QUEUED;
214b8ffc
SH		 2367 /*
2368 * add new request as second
2369 * first the terminated cqr needs to be finished
2370 */
2371 list_add(&cqr->devlist, device->ccw_queue.next);
138c014d 2372
1da177e4 2373 /* let the bh start the request to keep them in order */
8e09f215 2374 dasd_schedule_device_bh(device);
138c014d 2375
1da177e4
LT		 2376 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2377
c80ee724 2378 wait_event(generic_waitq, _wait_for_wakeup(cqr));
138c014d 2379
6cc7f168
SW		 2380 if (cqr->status == DASD_CQR_DONE)
2381 rc = 0;
2382 else if (cqr->intrc)
2383 rc = cqr->intrc;
2384 else
2385 rc = -EIO;
0e003b70
SH		 2386
2387 /* kick tasklets */
2388 dasd_schedule_device_bh(device);
2389 if (device->block)
2390 dasd_schedule_block_bh(device->block);
2391
1da177e4
LT		 2392 return rc;
2393}
7048a2b5 2394EXPORT_SYMBOL(dasd_sleep_on_immediatly);
1da177e4
LT		 2395
2396/*
2397 * Cancels a request that was started with dasd_sleep_on_req.
2398 * This is useful to timeout requests. The request will be
2399 * terminated if it is currently in i/o.
b99a946d 2400 * Returns 0 if request termination was successful
8e09f215
SW		 2401 * negative error code if termination failed
2402 * Cancellation of a request is an asynchronous operation! The calling
2403 * function has to wait until the request is properly returned via callback.
1da177e4 2404 */
8e09f215 2405int dasd_cancel_req(struct dasd_ccw_req *cqr)
1da177e4 2406{
8e09f215 2407 struct dasd_device *device = cqr->startdev;
1da177e4
LT		 2408 unsigned long flags;
2409 int rc;
2410
2411 rc = 0;
2412 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2413 switch (cqr->status) {
2414 case DASD_CQR_QUEUED:
8e09f215
SW		 2415 /* request was not started - just set to cleared */
2416 cqr->status = DASD_CQR_CLEARED;
931a3dce
SH		 2417 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2418 cqr->callback_data = DASD_SLEEPON_END_TAG;
1da177e4
LT		 2419 break;
2420 case DASD_CQR_IN_IO:
2421 /* request in IO - terminate IO and release again */
8e09f215
SW		 2422 rc = device->discipline->term_IO(cqr);
2423 if (rc) {
fc19f381
SH		 2424 dev_err(&device->cdev->dev,
2425 "Cancelling request %p failed with rc=%d\n",
2426 cqr, rc);
8e09f215 2427 } else {
1aae0560 2428 cqr->stopclk = get_tod_clock();
8e09f215 2429 }
1da177e4 2430 break;
8e09f215 2431 default: /* already finished or clear pending - do nothing */
1da177e4 2432 break;
8e09f215
SW		 2433 }
2434 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2435 dasd_schedule_device_bh(device);
2436 return rc;
2437}
7048a2b5 2438EXPORT_SYMBOL(dasd_cancel_req);
8e09f215 2439
8e09f215
SW		 2440/*
2441 * SECTION: Operations of the dasd_block layer.
2442 */
2443
2444/*
2445 * Timeout function for dasd_block. This is used when the block layer
2446 * is waiting for something that may not come reliably, (e.g. a state
2447 * change interrupt)
2448 */
2449static void dasd_block_timeout(unsigned long ptr)
2450{
2451 unsigned long flags;
2452 struct dasd_block *block;
2453
2454 block = (struct dasd_block *) ptr;
2455 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2456 /* re-activate request queue */
eb6e199b 2457 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
8e09f215
SW		 2458 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2459 dasd_schedule_block_bh(block);
2460}
2461
2462/*
2463 * Setup timeout for a dasd_block in jiffies.
2464 */
2465void dasd_block_set_timer(struct dasd_block *block, int expires)
2466{
48cae885
SW		 2467 if (expires == 0)
2468 del_timer(&block->timer);
2469 else
2470 mod_timer(&block->timer, jiffies + expires);
8e09f215 2471}
7048a2b5 2472EXPORT_SYMBOL(dasd_block_set_timer);
8e09f215
SW		 2473
2474/*
2475 * Clear timeout for a dasd_block.
2476 */
2477void dasd_block_clear_timer(struct dasd_block *block)
2478{
48cae885 2479 del_timer(&block->timer);
8e09f215 2480}
7048a2b5 2481EXPORT_SYMBOL(dasd_block_clear_timer);
8e09f215 2482
8e09f215
SW		 2483/*
2484 * Process finished error recovery ccw.
2485 */
eb6e199b
SW		 2486static void __dasd_process_erp(struct dasd_device *device,
2487 struct dasd_ccw_req *cqr)
8e09f215
SW		 2488{
2489 dasd_erp_fn_t erp_fn;
8e09f215
SW		 2490
2491 if (cqr->status == DASD_CQR_DONE)
2492 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2493 else
fc19f381 2494 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
8e09f215
SW		 2495 erp_fn = device->discipline->erp_postaction(cqr);
2496 erp_fn(cqr);
2497}
1da177e4 2498
8e09f215
SW		 2499/*
2500 * Fetch requests from the block device queue.
2501 */
2502static void __dasd_process_request_queue(struct dasd_block *block)
2503{
2504 struct request_queue *queue;
2505 struct request *req;
2506 struct dasd_ccw_req *cqr;
2507 struct dasd_device *basedev;
2508 unsigned long flags;
2509 queue = block->request_queue;
2510 basedev = block->base;
2511 /* No queue ? Then there is nothing to do. */
2512 if (queue == NULL)
2513 return;
2514
2515 /*
2516 * We requeue request from the block device queue to the ccw
2517 * queue only in two states. In state DASD_STATE_READY the
2518 * partition detection is done and we need to requeue requests
2519 * for that. State DASD_STATE_ONLINE is normal block device
2520 * operation.
2521 */
97f604b0
SW		 2522 if (basedev->state < DASD_STATE_READY) {
2523 while ((req = blk_fetch_request(block->request_queue)))
2524 __blk_end_request_all(req, -EIO);
8e09f215 2525 return;
97f604b0 2526 }
8e09f215 2527 /* Now we try to fetch requests from the request queue */
7eaceacc 2528 while ((req = blk_peek_request(queue))) {
8e09f215
SW		 2529 if (basedev->features & DASD_FEATURE_READONLY &&
2530 rq_data_dir(req) == WRITE) {
2531 DBF_DEV_EVENT(DBF_ERR, basedev,
2532 "Rejecting write request %p",
2533 req);
9934c8c0 2534 blk_start_request(req);
40cbbb78 2535 __blk_end_request_all(req, -EIO);
8e09f215
SW		 2536 continue;
2537 }
5ea34a01
HR		 2538 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
2539 (basedev->features & DASD_FEATURE_FAILFAST ||
2540 blk_noretry_request(req))) {
2541 DBF_DEV_EVENT(DBF_ERR, basedev,
2542 "Rejecting failfast request %p",
2543 req);
2544 blk_start_request(req);
2545 __blk_end_request_all(req, -ETIMEDOUT);
2546 continue;
2547 }
8e09f215
SW		 2548 cqr = basedev->discipline->build_cp(basedev, block, req);
2549 if (IS_ERR(cqr)) {
2550 if (PTR_ERR(cqr) == -EBUSY)
2551 break; /* normal end condition */
2552 if (PTR_ERR(cqr) == -ENOMEM)
2553 break; /* terminate request queue loop */
2554 if (PTR_ERR(cqr) == -EAGAIN) {
2555 /*
2556 * The current request cannot be build right
2557 * now, we have to try later. If this request
2558 * is the head-of-queue we stop the device
2559 * for 1/2 second.
2560 */
2561 if (!list_empty(&block->ccw_queue))
2562 break;
eb6e199b
SW		 2563 spin_lock_irqsave(
2564 get_ccwdev_lock(basedev->cdev), flags);
2565 dasd_device_set_stop_bits(basedev,
2566 DASD_STOPPED_PENDING);
2567 spin_unlock_irqrestore(
2568 get_ccwdev_lock(basedev->cdev), flags);
8e09f215
SW		 2569 dasd_block_set_timer(block, HZ/2);
2570 break;
2571 }
2572 DBF_DEV_EVENT(DBF_ERR, basedev,
2573 "CCW creation failed (rc=%ld) "
2574 "on request %p",
2575 PTR_ERR(cqr), req);
9934c8c0 2576 blk_start_request(req);
40cbbb78 2577 __blk_end_request_all(req, -EIO);
8e09f215
SW		 2578 continue;
2579 }
2580 /*
2581 * Note: callback is set to dasd_return_cqr_cb in
2582 * __dasd_block_start_head to cover erp requests as well
2583 */
2584 cqr->callback_data = (void *) req;
2585 cqr->status = DASD_CQR_FILLED;
a2ace466 2586 req->completion_data = cqr;
9934c8c0 2587 blk_start_request(req);
8e09f215 2588 list_add_tail(&cqr->blocklist, &block->ccw_queue);
a2ace466 2589 INIT_LIST_HEAD(&cqr->devlist);
8e09f215
SW		 2590 dasd_profile_start(block, cqr, req);
2591 }
2592}
2593
2594static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2595{
2596 struct request *req;
2597 int status;
4c4e2148 2598 int error = 0;
8e09f215
SW		 2599
2600 req = (struct request *) cqr->callback_data;
2601 dasd_profile_end(cqr->block, cqr, req);
fe6b8e76 2602 status = cqr->block->base->discipline->free_cp(cqr, req);
d1ffc1f8
HR		 2603 if (status < 0)
2604 error = status;
2605 else if (status == 0) {
2606 if (cqr->intrc == -EPERM)
2607 error = -EBADE;
2608 else if (cqr->intrc == -ENOLINK ||
2609 cqr->intrc == -ETIMEDOUT)
2610 error = cqr->intrc;
2611 else
2612 error = -EIO;
2613 }
40cbbb78 2614 __blk_end_request_all(req, error);
8e09f215
SW		 2615}
2616
2617/*
2618 * Process ccw request queue.
2619 */
2620static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2621 struct list_head *final_queue)
2622{
2623 struct list_head *l, *n;
2624 struct dasd_ccw_req *cqr;
2625 dasd_erp_fn_t erp_fn;
2626 unsigned long flags;
2627 struct dasd_device *base = block->base;
2628
2629restart:
2630 /* Process request with final status. */
2631 list_for_each_safe(l, n, &block->ccw_queue) {
2632 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2633 if (cqr->status != DASD_CQR_DONE &&
2634 cqr->status != DASD_CQR_FAILED &&
2635 cqr->status != DASD_CQR_NEED_ERP &&
2636 cqr->status != DASD_CQR_TERMINATED)
2637 continue;
2638
2639 if (cqr->status == DASD_CQR_TERMINATED) {
2640 base->discipline->handle_terminated_request(cqr);
2641 goto restart;
2642 }
2643
2644 /* Process requests that may be recovered */
2645 if (cqr->status == DASD_CQR_NEED_ERP) {
6c5f57c7 2646 erp_fn = base->discipline->erp_action(cqr);
6a5176c4
SH		 2647 if (IS_ERR(erp_fn(cqr)))
2648 continue;
8e09f215
SW		 2649 goto restart;
2650 }
2651
a9cffb22
SH		 2652 /* log sense for fatal error */
2653 if (cqr->status == DASD_CQR_FAILED) {
2654 dasd_log_sense(cqr, &cqr->irb);
2655 }
2656
8e09f215
SW		 2657 /* First of all call extended error reporting. */
2658 if (dasd_eer_enabled(base) &&
2659 cqr->status == DASD_CQR_FAILED) {
2660 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2661
2662 /* restart request */
2663 cqr->status = DASD_CQR_FILLED;
2664 cqr->retries = 255;
2665 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
eb6e199b 2666 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
8e09f215
SW		 2667 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2668 flags);
2669 goto restart;
2670 }
2671
2672 /* Process finished ERP request. */
2673 if (cqr->refers) {
eb6e199b 2674 __dasd_process_erp(base, cqr);
8e09f215
SW		 2675 goto restart;
2676 }
2677
2678 /* Rechain finished requests to final queue */
1aae0560 2679 cqr->endclk = get_tod_clock();
8e09f215
SW		 2680 list_move_tail(&cqr->blocklist, final_queue);
2681 }
2682}
2683
2684static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2685{
2686 dasd_schedule_block_bh(cqr->block);
2687}
2688
2689static void __dasd_block_start_head(struct dasd_block *block)
2690{
2691 struct dasd_ccw_req *cqr;
2692
2693 if (list_empty(&block->ccw_queue))
2694 return;
2695 /* We allways begin with the first requests on the queue, as some
2696 * of previously started requests have to be enqueued on a
2697 * dasd_device again for error recovery.
2698 */
2699 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2700 if (cqr->status != DASD_CQR_FILLED)
2701 continue;
5a27e60d
SW		 2702 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2703 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2704 cqr->status = DASD_CQR_FAILED;
2705 cqr->intrc = -EPERM;
2706 dasd_schedule_block_bh(block);
2707 continue;
2708 }
8e09f215
SW		 2709 /* Non-temporary stop condition will trigger fail fast */
2710 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2711 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2712 (!dasd_eer_enabled(block->base))) {
2713 cqr->status = DASD_CQR_FAILED;
d1ffc1f8 2714 cqr->intrc = -ENOLINK;
8e09f215
SW		 2715 dasd_schedule_block_bh(block);
2716 continue;
2717 }
2718 /* Don't try to start requests if device is stopped */
2719 if (block->base->stopped)
2720 return;
2721
2722 /* just a fail safe check, should not happen */
2723 if (!cqr->startdev)
2724 cqr->startdev = block->base;
2725
2726 /* make sure that the requests we submit find their way back */
2727 cqr->callback = dasd_return_cqr_cb;
2728
2729 dasd_add_request_tail(cqr);
2730 }
2731}
2732
2733/*
2734 * Central dasd_block layer routine. Takes requests from the generic
2735 * block layer request queue, creates ccw requests, enqueues them on
2736 * a dasd_device and processes ccw requests that have been returned.
2737 */
2738static void dasd_block_tasklet(struct dasd_block *block)
2739{
2740 struct list_head final_queue;
2741 struct list_head *l, *n;
2742 struct dasd_ccw_req *cqr;
2743
2744 atomic_set(&block->tasklet_scheduled, 0);
2745 INIT_LIST_HEAD(&final_queue);
2746 spin_lock(&block->queue_lock);
2747 /* Finish off requests on ccw queue */
2748 __dasd_process_block_ccw_queue(block, &final_queue);
2749 spin_unlock(&block->queue_lock);
2750 /* Now call the callback function of requests with final status */
2751 spin_lock_irq(&block->request_queue_lock);
2752 list_for_each_safe(l, n, &final_queue) {
2753 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2754 list_del_init(&cqr->blocklist);
2755 __dasd_cleanup_cqr(cqr);
2756 }
2757 spin_lock(&block->queue_lock);
2758 /* Get new request from the block device request queue */
2759 __dasd_process_request_queue(block);
2760 /* Now check if the head of the ccw queue needs to be started. */
2761 __dasd_block_start_head(block);
2762 spin_unlock(&block->queue_lock);
2763 spin_unlock_irq(&block->request_queue_lock);
4679e893
SH		 2764 if (waitqueue_active(&shutdown_waitq))
2765 wake_up(&shutdown_waitq);
8e09f215
SW		 2766 dasd_put_device(block->base);
2767}
2768
2769static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2770{
2771 wake_up(&dasd_flush_wq);
2772}
2773
c5576876
SH		 2774/*
2775 * Requeue a request back to the block request queue
2776 * only works for block requests
2777 */
2778static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2779{
2780 struct dasd_block *block = cqr->block;
2781 struct request *req;
2782 unsigned long flags;
2783
2784 if (!block)
2785 return -EINVAL;
2786 spin_lock_irqsave(&block->queue_lock, flags);
2787 req = (struct request *) cqr->callback_data;
2788 blk_requeue_request(block->request_queue, req);
2789 spin_unlock_irqrestore(&block->queue_lock, flags);
2790
2791 return 0;
2792}
2793
8e09f215
SW		 2794/*
2795 * Go through all request on the dasd_block request queue, cancel them
2796 * on the respective dasd_device, and return them to the generic
2797 * block layer.
2798 */
2799static int dasd_flush_block_queue(struct dasd_block *block)
2800{
2801 struct dasd_ccw_req *cqr, *n;
2802 int rc, i;
2803 struct list_head flush_queue;
2804
2805 INIT_LIST_HEAD(&flush_queue);
2806 spin_lock_bh(&block->queue_lock);
2807 rc = 0;
2808restart:
2809 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2810 /* if this request currently owned by a dasd_device cancel it */
2811 if (cqr->status >= DASD_CQR_QUEUED)
2812 rc = dasd_cancel_req(cqr);
2813 if (rc < 0)
2814 break;
2815 /* Rechain request (including erp chain) so it won't be
2816 * touched by the dasd_block_tasklet anymore.
2817 * Replace the callback so we notice when the request
2818 * is returned from the dasd_device layer.
2819 */
2820 cqr->callback = _dasd_wake_block_flush_cb;
2821 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2822 list_move_tail(&cqr->blocklist, &flush_queue);
2823 if (i > 1)
2824 /* moved more than one request - need to restart */
2825 goto restart;
2826 }
2827 spin_unlock_bh(&block->queue_lock);
2828 /* Now call the callback function of flushed requests */
2829restart_cb:
2830 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2831 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2832 /* Process finished ERP request. */
2833 if (cqr->refers) {
0cd4bd47 2834 spin_lock_bh(&block->queue_lock);
eb6e199b 2835 __dasd_process_erp(block->base, cqr);
0cd4bd47 2836 spin_unlock_bh(&block->queue_lock);
8e09f215
SW		 2837 /* restart list_for_xx loop since dasd_process_erp
2838 * might remove multiple elements */
2839 goto restart_cb;
2840 }
2841 /* call the callback function */
0cd4bd47 2842 spin_lock_irq(&block->request_queue_lock);
1aae0560 2843 cqr->endclk = get_tod_clock();
8e09f215
SW		 2844 list_del_init(&cqr->blocklist);
2845 __dasd_cleanup_cqr(cqr);
0cd4bd47 2846 spin_unlock_irq(&block->request_queue_lock);
1da177e4 2847 }
1da177e4
LT		 2848 return rc;
2849}
2850
2851/*
8e09f215
SW		 2852 * Schedules a call to dasd_tasklet over the device tasklet.
2853 */
2854void dasd_schedule_block_bh(struct dasd_block *block)
2855{
2856 /* Protect against rescheduling. */
2857 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2858 return;
2859 /* life cycle of block is bound to it's base device */
2860 dasd_get_device(block->base);
2861 tasklet_hi_schedule(&block->tasklet);
2862}
7048a2b5 2863EXPORT_SYMBOL(dasd_schedule_block_bh);
8e09f215
SW		 2864
2865
2866/*
2867 * SECTION: external block device operations
2868 * (request queue handling, open, release, etc.)
1da177e4
LT		 2869 */
2870
2871/*
2872 * Dasd request queue function. Called from ll_rw_blk.c
2873 */
8e09f215 2874static void do_dasd_request(struct request_queue *queue)
1da177e4 2875{
8e09f215 2876 struct dasd_block *block;
1da177e4 2877
8e09f215
SW		 2878 block = queue->queuedata;
2879 spin_lock(&block->queue_lock);
1da177e4 2880 /* Get new request from the block device request queue */
8e09f215 2881 __dasd_process_request_queue(block);
1da177e4 2882 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 2883 __dasd_block_start_head(block);
2884 spin_unlock(&block->queue_lock);
1da177e4
LT		 2885}
2886
a2ace466
HR		 2887/*
2888 * Block timeout callback, called from the block layer
2889 *
2890 * request_queue lock is held on entry.
2891 *
2892 * Return values:
2893 * BLK_EH_RESET_TIMER if the request should be left running
2894 * BLK_EH_NOT_HANDLED if the request is handled or terminated
2895 * by the driver.
2896 */
2897enum blk_eh_timer_return dasd_times_out(struct request *req)
2898{
2899 struct dasd_ccw_req *cqr = req->completion_data;
2900 struct dasd_block *block = req->q->queuedata;
2901 struct dasd_device *device;
2902 int rc = 0;
2903
2904 if (!cqr)
2905 return BLK_EH_NOT_HANDLED;
2906
2907 device = cqr->startdev ? cqr->startdev : block->base;
3d71ad32
HR		 2908 if (!device->blk_timeout)
2909 return BLK_EH_RESET_TIMER;
a2ace466
HR		 2910 DBF_DEV_EVENT(DBF_WARNING, device,
2911 " dasd_times_out cqr %p status %x",
2912 cqr, cqr->status);
2913
2914 spin_lock(&block->queue_lock);
2915 spin_lock(get_ccwdev_lock(device->cdev));
2916 cqr->retries = -1;
2917 cqr->intrc = -ETIMEDOUT;
2918 if (cqr->status >= DASD_CQR_QUEUED) {
2919 spin_unlock(get_ccwdev_lock(device->cdev));
2920 rc = dasd_cancel_req(cqr);
2921 } else if (cqr->status == DASD_CQR_FILLED ||
2922 cqr->status == DASD_CQR_NEED_ERP) {
2923 cqr->status = DASD_CQR_TERMINATED;
2924 spin_unlock(get_ccwdev_lock(device->cdev));
2925 } else if (cqr->status == DASD_CQR_IN_ERP) {
2926 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
2927
2928 list_for_each_entry_safe(searchcqr, nextcqr,
2929 &block->ccw_queue, blocklist) {
2930 tmpcqr = searchcqr;
2931 while (tmpcqr->refers)
2932 tmpcqr = tmpcqr->refers;
2933 if (tmpcqr != cqr)
2934 continue;
2935 /* searchcqr is an ERP request for cqr */
2936 searchcqr->retries = -1;
2937 searchcqr->intrc = -ETIMEDOUT;
2938 if (searchcqr->status >= DASD_CQR_QUEUED) {
2939 spin_unlock(get_ccwdev_lock(device->cdev));
2940 rc = dasd_cancel_req(searchcqr);
2941 spin_lock(get_ccwdev_lock(device->cdev));
2942 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
2943 (searchcqr->status == DASD_CQR_NEED_ERP)) {
2944 searchcqr->status = DASD_CQR_TERMINATED;
2945 rc = 0;
2946 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
2947 /*
2948 * Shouldn't happen; most recent ERP
2949 * request is at the front of queue
2950 */
2951 continue;
2952 }
2953 break;
2954 }
2955 spin_unlock(get_ccwdev_lock(device->cdev));
2956 }
2957 dasd_schedule_block_bh(block);
2958 spin_unlock(&block->queue_lock);
2959
2960 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
2961}
2962
1da177e4
LT		 2963/*
2964 * Allocate and initialize request queue and default I/O scheduler.
2965 */
8e09f215 2966static int dasd_alloc_queue(struct dasd_block *block)
1da177e4 2967{
8e09f215
SW		 2968 block->request_queue = blk_init_queue(do_dasd_request,
2969 &block->request_queue_lock);
2970 if (block->request_queue == NULL)
1da177e4
LT		 2971 return -ENOMEM;
2972
8e09f215 2973 block->request_queue->queuedata = block;
1da177e4 2974
a5fd8ddc 2975 return 0;
1da177e4
LT		 2976}
2977
2978/*
2979 * Allocate and initialize request queue.
2980 */
8e09f215 2981static void dasd_setup_queue(struct dasd_block *block)
1da177e4
LT		 2982{
2983 int max;
2984
e4dbb0f2
SH		 2985 if (block->base->features & DASD_FEATURE_USERAW) {
2986 /*
2987 * the max_blocks value for raw_track access is 256
2988 * it is higher than the native ECKD value because we
2989 * only need one ccw per track
2990 * so the max_hw_sectors are
2991 * 2048 x 512B = 1024kB = 16 tracks
2992 */
2993 max = 2048;
2994 } else {
2995 max = block->base->discipline->max_blocks << block->s2b_shift;
2996 }
2997 blk_queue_logical_block_size(block->request_queue,
2998 block->bp_block);
086fa5ff 2999 blk_queue_max_hw_sectors(block->request_queue, max);
8a78362c 3000 blk_queue_max_segments(block->request_queue, -1L);
f3eb5384
SW		 3001 /* with page sized segments we can translate each segement into
3002 * one idaw/tidaw
3003 */
3004 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
3005 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
1da177e4
LT		 3006}
3007
3008/*
3009 * Deactivate and free request queue.
3010 */
8e09f215 3011static void dasd_free_queue(struct dasd_block *block)
1da177e4 3012{
8e09f215
SW		 3013 if (block->request_queue) {
3014 blk_cleanup_queue(block->request_queue);
3015 block->request_queue = NULL;
1da177e4
LT		 3016 }
3017}
3018
3019/*
3020 * Flush request on the request queue.
3021 */
8e09f215 3022static void dasd_flush_request_queue(struct dasd_block *block)
1da177e4
LT		 3023{
3024 struct request *req;
3025
8e09f215 3026 if (!block->request_queue)
1da177e4 3027 return;
138c014d 3028
8e09f215 3029 spin_lock_irq(&block->request_queue_lock);
9934c8c0 3030 while ((req = blk_fetch_request(block->request_queue)))
40cbbb78 3031 __blk_end_request_all(req, -EIO);
8e09f215 3032 spin_unlock_irq(&block->request_queue_lock);
1da177e4
LT		 3033}
3034
57a7c0bc 3035static int dasd_open(struct block_device *bdev, fmode_t mode)
1da177e4 3036{
9eb25122 3037 struct dasd_device *base;
1da177e4
LT		 3038 int rc;
3039
65f8da47
SW		 3040 base = dasd_device_from_gendisk(bdev->bd_disk);
3041 if (!base)
9eb25122
SH		 3042 return -ENODEV;
3043
65f8da47 3044 atomic_inc(&base->block->open_count);
8e09f215 3045 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
1da177e4
LT		 3046 rc = -ENODEV;
3047 goto unlock;
3048 }
3049
8e09f215 3050 if (!try_module_get(base->discipline->owner)) {
1da177e4
LT		 3051 rc = -EINVAL;
3052 goto unlock;
3053 }
3054
3055 if (dasd_probeonly) {
fc19f381
SH		 3056 dev_info(&base->cdev->dev,
3057 "Accessing the DASD failed because it is in "
3058 "probeonly mode\n");
1da177e4
LT		 3059 rc = -EPERM;
3060 goto out;
3061 }
3062
8e09f215
SW		 3063 if (base->state <= DASD_STATE_BASIC) {
3064 DBF_DEV_EVENT(DBF_ERR, base, " %s",
1da177e4
LT		 3065 " Cannot open unrecognized device");
3066 rc = -ENODEV;
3067 goto out;
3068 }
3069
33b62a30
SW		 3070 if ((mode & FMODE_WRITE) &&
3071 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3072 (base->features & DASD_FEATURE_READONLY))) {
3073 rc = -EROFS;
3074 goto out;
3075 }
3076
65f8da47 3077 dasd_put_device(base);
1da177e4
LT		 3078 return 0;
3079
3080out:
8e09f215 3081 module_put(base->discipline->owner);
1da177e4 3082unlock:
65f8da47
SW		 3083 atomic_dec(&base->block->open_count);
3084 dasd_put_device(base);
1da177e4
LT		 3085 return rc;
3086}
3087
db2a144b 3088static void dasd_release(struct gendisk *disk, fmode_t mode)
1da177e4 3089{
db2a144b
AV		 3090 struct dasd_device *base = dasd_device_from_gendisk(disk);
3091 if (base) {
3092 atomic_dec(&base->block->open_count);
3093 module_put(base->discipline->owner);
3094 dasd_put_device(base);
3095 }
1da177e4
LT		 3096}
3097
a885c8c4
CH		 3098/*
3099 * Return disk geometry.
3100 */
8e09f215 3101static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
a885c8c4 3102{
8e09f215 3103 struct dasd_device *base;
a885c8c4 3104
65f8da47
SW		 3105 base = dasd_device_from_gendisk(bdev->bd_disk);
3106 if (!base)
a885c8c4
CH		 3107 return -ENODEV;
3108
8e09f215 3109 if (!base->discipline ||
65f8da47
SW		 3110 !base->discipline->fill_geometry) {
3111 dasd_put_device(base);
a885c8c4 3112 return -EINVAL;
65f8da47
SW		 3113 }
3114 base->discipline->fill_geometry(base->block, geo);
3115 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3116 dasd_put_device(base);
a885c8c4
CH		 3117 return 0;
3118}
3119
83d5cde4 3120const struct block_device_operations
1da177e4
LT		 3121dasd_device_operations = {
3122 .owner = THIS_MODULE,
57a7c0bc
AV		 3123 .open = dasd_open,
3124 .release = dasd_release,
0000d031
HC		 3125 .ioctl = dasd_ioctl,
3126 .compat_ioctl = dasd_ioctl,
a885c8c4 3127 .getgeo = dasd_getgeo,
1da177e4
LT		 3128};
3129
8e09f215
SW		 3130/*******************************************************************************
3131 * end of block device operations
3132 */
1da177e4
LT		 3133
3134static void
3135dasd_exit(void)
3136{
3137#ifdef CONFIG_PROC_FS
3138 dasd_proc_exit();
3139#endif
20c64468 3140 dasd_eer_exit();
6bb0e010
HH		 3141 if (dasd_page_cache != NULL) {
3142 kmem_cache_destroy(dasd_page_cache);
3143 dasd_page_cache = NULL;
3144 }
1da177e4
LT		 3145 dasd_gendisk_exit();
3146 dasd_devmap_exit();
1da177e4
LT		 3147 if (dasd_debug_area != NULL) {
3148 debug_unregister(dasd_debug_area);
3149 dasd_debug_area = NULL;
3150 }
4fa52aa7 3151 dasd_statistics_removeroot();
1da177e4
LT		 3152}
3153
3154/*
3155 * SECTION: common functions for ccw_driver use
3156 */
3157
33b62a30
SW		 3158/*
3159 * Is the device read-only?
3160 * Note that this function does not report the setting of the
3161 * readonly device attribute, but how it is configured in z/VM.
3162 */
3163int dasd_device_is_ro(struct dasd_device *device)
3164{
3165 struct ccw_dev_id dev_id;
3166 struct diag210 diag_data;
3167 int rc;
3168
3169 if (!MACHINE_IS_VM)
3170 return 0;
3171 ccw_device_get_id(device->cdev, &dev_id);
3172 memset(&diag_data, 0, sizeof(diag_data));
3173 diag_data.vrdcdvno = dev_id.devno;
3174 diag_data.vrdclen = sizeof(diag_data);
3175 rc = diag210(&diag_data);
3176 if (rc == 0 || rc == 2) {
3177 return diag_data.vrdcvfla & 0x80;
3178 } else {
3179 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3180 dev_id.devno, rc);
3181 return 0;
3182 }
3183}
3184EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3185
f3445a1a
CH		 3186static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3187{
3188 struct ccw_device *cdev = data;
3189 int ret;
3190
3191 ret = ccw_device_set_online(cdev);
3192 if (ret)
4ce25966
FF		 3193 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3194 dev_name(&cdev->dev), ret);
f3445a1a
CH		 3195}
3196
1c01b8a5
HH		 3197/*
3198 * Initial attempt at a probe function. this can be simplified once
3199 * the other detection code is gone.
3200 */
8e09f215
SW		 3201int dasd_generic_probe(struct ccw_device *cdev,
3202 struct dasd_discipline *discipline)
1da177e4
LT		 3203{
3204 int ret;
3205
3206 ret = dasd_add_sysfs_files(cdev);
3207 if (ret) {
b8ed5dd5
SH		 3208 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3209 "dasd_generic_probe: could not add "
3210 "sysfs entries");
40545573 3211 return ret;
1da177e4 3212 }
40545573 3213 cdev->handler = &dasd_int_handler;
1da177e4 3214
40545573
HH		 3215 /*
3216 * Automatically online either all dasd devices (dasd_autodetect)
3217 * or all devices specified with dasd= parameters during
3218 * initial probe.
3219 */
3220 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2a0217d5 3221 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
f3445a1a 3222 async_schedule(dasd_generic_auto_online, cdev);
de3e0da1 3223 return 0;
1da177e4 3224}
7048a2b5 3225EXPORT_SYMBOL_GPL(dasd_generic_probe);
1da177e4 3226
1c01b8a5
HH		 3227/*
3228 * This will one day be called from a global not_oper handler.
3229 * It is also used by driver_unregister during module unload.
3230 */
8e09f215 3231void dasd_generic_remove(struct ccw_device *cdev)
1da177e4
LT		 3232{
3233 struct dasd_device *device;
8e09f215 3234 struct dasd_block *block;
1da177e4 3235
59afda78
HH		 3236 cdev->handler = NULL;
3237
1da177e4 3238 device = dasd_device_from_cdev(cdev);
be4904e5
SW		 3239 if (IS_ERR(device)) {
3240 dasd_remove_sysfs_files(cdev);
1da177e4 3241 return;
be4904e5 3242 }
d07dc5d8
SH		 3243 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3244 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1da177e4
LT		 3245 /* Already doing offline processing */
3246 dasd_put_device(device);
be4904e5 3247 dasd_remove_sysfs_files(cdev);
1da177e4
LT		 3248 return;
3249 }
3250 /*
3251 * This device is removed unconditionally. Set offline
3252 * flag to prevent dasd_open from opening it while it is
3253 * no quite down yet.
3254 */
3255 dasd_set_target_state(device, DASD_STATE_NEW);
3256 /* dasd_delete_device destroys the device reference. */
8e09f215 3257 block = device->block;
1da177e4 3258 dasd_delete_device(device);
8e09f215
SW		 3259 /*
3260 * life cycle of block is bound to device, so delete it after
3261 * device was safely removed
3262 */
3263 if (block)
3264 dasd_free_block(block);
d07dc5d8
SH		 3265
3266 dasd_remove_sysfs_files(cdev);
1da177e4 3267}
7048a2b5 3268EXPORT_SYMBOL_GPL(dasd_generic_remove);
1da177e4 3269
1c01b8a5
HH		 3270/*
3271 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1da177e4 3272 * the device is detected for the first time and is supposed to be used
1c01b8a5
HH		 3273 * or the user has started activation through sysfs.
3274 */
8e09f215
SW		 3275int dasd_generic_set_online(struct ccw_device *cdev,
3276 struct dasd_discipline *base_discipline)
1da177e4 3277{
aa88861f 3278 struct dasd_discipline *discipline;
1da177e4 3279 struct dasd_device *device;
c6eb7b77 3280 int rc;
f24acd45 3281
40545573
HH		 3282 /* first online clears initial online feature flag */
3283 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
1da177e4
LT		 3284 device = dasd_create_device(cdev);
3285 if (IS_ERR(device))
3286 return PTR_ERR(device);
3287
aa88861f 3288 discipline = base_discipline;
c6eb7b77 3289 if (device->features & DASD_FEATURE_USEDIAG) {
1da177e4 3290 if (!dasd_diag_discipline_pointer) {
4ce25966
FF		 3291 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3292 dev_name(&cdev->dev));
1da177e4
LT		 3293 dasd_delete_device(device);
3294 return -ENODEV;
3295 }
3296 discipline = dasd_diag_discipline_pointer;
3297 }
aa88861f
PO		 3298 if (!try_module_get(base_discipline->owner)) {
3299 dasd_delete_device(device);
3300 return -EINVAL;
3301 }
3302 if (!try_module_get(discipline->owner)) {
3303 module_put(base_discipline->owner);
3304 dasd_delete_device(device);
3305 return -EINVAL;
3306 }
3307 device->base_discipline = base_discipline;
1da177e4
LT		 3308 device->discipline = discipline;
3309
8e09f215 3310 /* check_device will allocate block device if necessary */
1da177e4
LT		 3311 rc = discipline->check_device(device);
3312 if (rc) {
4ce25966
FF		 3313 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3314 dev_name(&cdev->dev), discipline->name, rc);
aa88861f
PO		 3315 module_put(discipline->owner);
3316 module_put(base_discipline->owner);
1da177e4
LT		 3317 dasd_delete_device(device);
3318 return rc;
3319 }
3320
3321 dasd_set_target_state(device, DASD_STATE_ONLINE);
3322 if (device->state <= DASD_STATE_KNOWN) {
4ce25966
FF		 3323 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3324 dev_name(&cdev->dev));
1da177e4
LT		 3325 rc = -ENODEV;
3326 dasd_set_target_state(device, DASD_STATE_NEW);
8e09f215
SW		 3327 if (device->block)
3328 dasd_free_block(device->block);
1da177e4
LT		 3329 dasd_delete_device(device);
3330 } else
3331 pr_debug("dasd_generic device %s found\n",
2a0217d5 3332 dev_name(&cdev->dev));
589c74d5
SH		 3333
3334 wait_event(dasd_init_waitq, _wait_for_device(device));
3335
1da177e4 3336 dasd_put_device(device);
1da177e4
LT		 3337 return rc;
3338}
7048a2b5 3339EXPORT_SYMBOL_GPL(dasd_generic_set_online);
1da177e4 3340
8e09f215 3341int dasd_generic_set_offline(struct ccw_device *cdev)
1da177e4
LT		 3342{
3343 struct dasd_device *device;
8e09f215 3344 struct dasd_block *block;
d07dc5d8 3345 int max_count, open_count, rc;
1da177e4 3346
d07dc5d8 3347 rc = 0;
1da177e4
LT		 3348 device = dasd_device_from_cdev(cdev);
3349 if (IS_ERR(device))
3350 return PTR_ERR(device);
d07dc5d8 3351
1da177e4
LT		 3352 /*
3353 * We must make sure that this device is currently not in use.
3354 * The open_count is increased for every opener, that includes
3355 * the blkdev_get in dasd_scan_partitions. We are only interested
3356 * in the other openers.
3357 */
8e09f215 3358 if (device->block) {
a806170e
HC		 3359 max_count = device->block->bdev ? 0 : -1;
3360 open_count = atomic_read(&device->block->open_count);
8e09f215
SW		 3361 if (open_count > max_count) {
3362 if (open_count > 0)
4ce25966
FF		 3363 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3364 dev_name(&cdev->dev), open_count);
8e09f215 3365 else
4ce25966
FF		 3366 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3367 dev_name(&cdev->dev));
8e09f215
SW		 3368 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3369 dasd_put_device(device);
3370 return -EBUSY;
3371 }
1da177e4 3372 }
d07dc5d8
SH		 3373
3374 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3375 /*
b4a96015 3376 * safe offline already running
d07dc5d8
SH		 3377 * could only be called by normal offline so safe_offline flag
3378 * needs to be removed to run normal offline and kill all I/O
3379 */
3380 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3381 /* Already doing normal offline processing */
3382 dasd_put_device(device);
3383 return -EBUSY;
3384 } else
3385 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3386
3387 } else
3388 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3389 /* Already doing offline processing */
3390 dasd_put_device(device);
3391 return -EBUSY;
3392 }
3393
3394 /*
3395 * if safe_offline called set safe_offline_running flag and
3396 * clear safe_offline so that a call to normal offline
3397 * can overrun safe_offline processing
3398 */
3399 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3400 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3401 /*
3402 * If we want to set the device safe offline all IO operations
3403 * should be finished before continuing the offline process
3404 * so sync bdev first and then wait for our queues to become
3405 * empty
3406 */
3407 /* sync blockdev and partitions */
3408 rc = fsync_bdev(device->block->bdev);
3409 if (rc != 0)
3410 goto interrupted;
3411
3412 /* schedule device tasklet and wait for completion */
3413 dasd_schedule_device_bh(device);
3414 rc = wait_event_interruptible(shutdown_waitq,
3415 _wait_for_empty_queues(device));
3416 if (rc != 0)
3417 goto interrupted;
3418 }
3419
3420 set_bit(DASD_FLAG_OFFLINE, &device->flags);
1da177e4
LT		 3421 dasd_set_target_state(device, DASD_STATE_NEW);
3422 /* dasd_delete_device destroys the device reference. */
8e09f215 3423 block = device->block;
1da177e4 3424 dasd_delete_device(device);
8e09f215
SW		 3425 /*
3426 * life cycle of block is bound to device, so delete it after
3427 * device was safely removed
3428 */
3429 if (block)
3430 dasd_free_block(block);
1da177e4 3431 return 0;
d07dc5d8
SH		 3432
3433interrupted:
3434 /* interrupted by signal */
3435 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3436 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3437 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3438 dasd_put_device(device);
3439 return rc;
1da177e4 3440}
7048a2b5 3441EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
1da177e4 3442
a4d26c6a
SW		 3443int dasd_generic_last_path_gone(struct dasd_device *device)
3444{
3445 struct dasd_ccw_req *cqr;
3446
3447 dev_warn(&device->cdev->dev, "No operational channel path is left "
3448 "for the device\n");
3449 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3450 /* First of all call extended error reporting. */
3451 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3452
3453 if (device->state < DASD_STATE_BASIC)
3454 return 0;
3455 /* Device is active. We want to keep it. */
3456 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3457 if ((cqr->status == DASD_CQR_IN_IO) ||
3458 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3459 cqr->status = DASD_CQR_QUEUED;
3460 cqr->retries++;
3461 }
3462 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3463 dasd_device_clear_timer(device);
3464 dasd_schedule_device_bh(device);
3465 return 1;
3466}
3467EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3468
3469int dasd_generic_path_operational(struct dasd_device *device)
3470{
3471 dev_info(&device->cdev->dev, "A channel path to the device has become "
3472 "operational\n");
3473 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3474 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3475 if (device->stopped & DASD_UNRESUMED_PM) {
3476 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3477 dasd_restore_device(device);
3478 return 1;
3479 }
3480 dasd_schedule_device_bh(device);
3481 if (device->block)
3482 dasd_schedule_block_bh(device->block);
931a3dce
SH		 3483
3484 if (!device->stopped)
3485 wake_up(&generic_waitq);
3486
a4d26c6a
SW		 3487 return 1;
3488}
3489EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3490
8e09f215 3491int dasd_generic_notify(struct ccw_device *cdev, int event)
1da177e4
LT		 3492{
3493 struct dasd_device *device;
1da177e4
LT		 3494 int ret;
3495
91c36919 3496 device = dasd_device_from_cdev_locked(cdev);
1da177e4
LT		 3497 if (IS_ERR(device))
3498 return 0;
1da177e4
LT		 3499 ret = 0;
3500 switch (event) {
3501 case CIO_GONE:
47593bfa 3502 case CIO_BOXED:
1da177e4 3503 case CIO_NO_PATH:
a4d26c6a
SW		 3504 device->path_data.opm = 0;
3505 device->path_data.ppm = 0;
3506 device->path_data.npm = 0;
3507 ret = dasd_generic_last_path_gone(device);
1da177e4
LT		 3508 break;
3509 case CIO_OPER:
1da177e4 3510 ret = 1;
a4d26c6a
SW		 3511 if (device->path_data.opm)
3512 ret = dasd_generic_path_operational(device);
1da177e4
LT		 3513 break;
3514 }
1da177e4
LT		 3515 dasd_put_device(device);
3516 return ret;
3517}
7048a2b5 3518EXPORT_SYMBOL_GPL(dasd_generic_notify);
1da177e4 3519
a4d26c6a
SW		 3520void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3521{
3522 int chp;
3523 __u8 oldopm, eventlpm;
3524 struct dasd_device *device;
3525
3526 device = dasd_device_from_cdev_locked(cdev);
3527 if (IS_ERR(device))
3528 return;
3529 for (chp = 0; chp < 8; chp++) {
3530 eventlpm = 0x80 >> chp;
3531 if (path_event[chp] & PE_PATH_GONE) {
3532 oldopm = device->path_data.opm;
3533 device->path_data.opm &= ~eventlpm;
3534 device->path_data.ppm &= ~eventlpm;
3535 device->path_data.npm &= ~eventlpm;
8b811bae
SW		 3536 if (oldopm && !device->path_data.opm) {
3537 dev_warn(&device->cdev->dev,
3538 "No verified channel paths remain "
3539 "for the device\n");
3540 DBF_DEV_EVENT(DBF_WARNING, device,
3541 "%s", "last verified path gone");
3542 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3543 dasd_device_set_stop_bits(device,
3544 DASD_STOPPED_DC_WAIT);
3545 }
a4d26c6a
SW		 3546 }
3547 if (path_event[chp] & PE_PATH_AVAILABLE) {
3548 device->path_data.opm &= ~eventlpm;
3549 device->path_data.ppm &= ~eventlpm;
3550 device->path_data.npm &= ~eventlpm;
3551 device->path_data.tbvpm |= eventlpm;
3552 dasd_schedule_device_bh(device);
3553 }
f1633031 3554 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
12d7b107
SH		 3555 if (!(device->path_data.opm & eventlpm) &&
3556 !(device->path_data.tbvpm & eventlpm)) {
3557 /*
3558 * we can not establish a pathgroup on an
3559 * unavailable path, so trigger a path
3560 * verification first
3561 */
3562 device->path_data.tbvpm |= eventlpm;
3563 dasd_schedule_device_bh(device);
3564 }
f1633031
SH		 3565 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3566 "Pathgroup re-established\n");
3567 if (device->discipline->kick_validate)
3568 device->discipline->kick_validate(device);
3569 }
a4d26c6a
SW		 3570 }
3571 dasd_put_device(device);
3572}
3573EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3574
3575int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3576{
3577 if (!device->path_data.opm && lpm) {
3578 device->path_data.opm = lpm;
3579 dasd_generic_path_operational(device);
3580 } else
3581 device->path_data.opm |= lpm;
3582 return 0;
3583}
3584EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3585
3586
d41dd122
SH		 3587int dasd_generic_pm_freeze(struct ccw_device *cdev)
3588{
c5576876
SH		 3589 struct dasd_device *device = dasd_device_from_cdev(cdev);
3590 struct list_head freeze_queue;
d41dd122 3591 struct dasd_ccw_req *cqr, *n;
c5576876 3592 struct dasd_ccw_req *refers;
d41dd122 3593 int rc;
d41dd122
SH		 3594
3595 if (IS_ERR(device))
3596 return PTR_ERR(device);
6f272b9c 3597
c8d1c0ff
SH		 3598 /* mark device as suspended */
3599 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3600
6f272b9c
SH		 3601 if (device->discipline->freeze)
3602 rc = device->discipline->freeze(device);
3603
d41dd122 3604 /* disallow new I/O */
eb6e199b 3605 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
c5576876
SH		 3606
3607 /* clear active requests and requeue them to block layer if possible */
d41dd122
SH		 3608 INIT_LIST_HEAD(&freeze_queue);
3609 spin_lock_irq(get_ccwdev_lock(cdev));
3610 rc = 0;
3611 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3612 /* Check status and move request to flush_queue */
3613 if (cqr->status == DASD_CQR_IN_IO) {
3614 rc = device->discipline->term_IO(cqr);
3615 if (rc) {
3616 /* unable to terminate requeust */
3617 dev_err(&device->cdev->dev,
3618 "Unable to terminate request %p "
3619 "on suspend\n", cqr);
3620 spin_unlock_irq(get_ccwdev_lock(cdev));
3621 dasd_put_device(device);
3622 return rc;
3623 }
3624 }
3625 list_move_tail(&cqr->devlist, &freeze_queue);
3626 }
d41dd122
SH		 3627 spin_unlock_irq(get_ccwdev_lock(cdev));
3628
3629 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3630 wait_event(dasd_flush_wq,
3631 (cqr->status != DASD_CQR_CLEAR_PENDING));
3632 if (cqr->status == DASD_CQR_CLEARED)
3633 cqr->status = DASD_CQR_QUEUED;
c5576876
SH		 3634
3635 /* requeue requests to blocklayer will only work for
3636 block device requests */
3637 if (_dasd_requeue_request(cqr))
3638 continue;
3639
3640 /* remove requests from device and block queue */
3641 list_del_init(&cqr->devlist);
3642 while (cqr->refers != NULL) {
3643 refers = cqr->refers;
3644 /* remove the request from the block queue */
3645 list_del(&cqr->blocklist);
3646 /* free the finished erp request */
3647 dasd_free_erp_request(cqr, cqr->memdev);
3648 cqr = refers;
3649 }
3650 if (cqr->block)
3651 list_del_init(&cqr->blocklist);
3652 cqr->block->base->discipline->free_cp(
3653 cqr, (struct request *) cqr->callback_data);
d41dd122 3654 }
d41dd122 3655
c5576876
SH		 3656 /*
3657 * if requests remain then they are internal request
3658 * and go back to the device queue
3659 */
3660 if (!list_empty(&freeze_queue)) {
3661 /* move freeze_queue to start of the ccw_queue */
3662 spin_lock_irq(get_ccwdev_lock(cdev));
3663 list_splice_tail(&freeze_queue, &device->ccw_queue);
3664 spin_unlock_irq(get_ccwdev_lock(cdev));
3665 }
d41dd122
SH		 3666 dasd_put_device(device);
3667 return rc;
3668}
3669EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3670
3671int dasd_generic_restore_device(struct ccw_device *cdev)
3672{
3673 struct dasd_device *device = dasd_device_from_cdev(cdev);
3674 int rc = 0;
3675
3676 if (IS_ERR(device))
3677 return PTR_ERR(device);
3678
e6125fba 3679 /* allow new IO again */
eb6e199b
SW		 3680 dasd_device_remove_stop_bits(device,
3681 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
e6125fba 3682
d41dd122 3683 dasd_schedule_device_bh(device);
d41dd122 3684
eb6e199b
SW		 3685 /*
3686 * call discipline restore function
3687 * if device is stopped do nothing e.g. for disconnected devices
3688 */
3689 if (device->discipline->restore && !(device->stopped))
d41dd122 3690 rc = device->discipline->restore(device);
eb6e199b 3691 if (rc || device->stopped)
e6125fba
SH		 3692 /*
3693 * if the resume failed for the DASD we put it in
3694 * an UNRESUMED stop state
3695 */
3696 device->stopped |= DASD_UNRESUMED_PM;
d41dd122 3697
6fca97a9
SH		 3698 if (device->block)
3699 dasd_schedule_block_bh(device->block);
3700
c8d1c0ff 3701 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
d41dd122 3702 dasd_put_device(device);
e6125fba 3703 return 0;
d41dd122
SH		 3704}
3705EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3706
763968e2
HC		 3707static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3708 void *rdc_buffer,
3709 int rdc_buffer_size,
68b781fe 3710 int magic)
17283b56
CH		 3711{
3712 struct dasd_ccw_req *cqr;
3713 struct ccw1 *ccw;
d9fa9441 3714 unsigned long *idaw;
17283b56
CH		 3715
3716 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3717
3718 if (IS_ERR(cqr)) {
fc19f381
SH		 3719 /* internal error 13 - Allocating the RDC request failed*/
3720 dev_err(&device->cdev->dev,
3721 "An error occurred in the DASD device driver, "
3722 "reason=%s\n", "13");
17283b56
CH		 3723 return cqr;
3724 }
3725
3726 ccw = cqr->cpaddr;
3727 ccw->cmd_code = CCW_CMD_RDC;
d9fa9441
SH		 3728 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3729 idaw = (unsigned long *) (cqr->data);
3730 ccw->cda = (__u32)(addr_t) idaw;
3731 ccw->flags = CCW_FLAG_IDA;
3732 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3733 } else {
3734 ccw->cda = (__u32)(addr_t) rdc_buffer;
3735 ccw->flags = 0;
3736 }
17283b56 3737
d9fa9441 3738 ccw->count = rdc_buffer_size;
8e09f215
SW		 3739 cqr->startdev = device;
3740 cqr->memdev = device;
17283b56 3741 cqr->expires = 10*HZ;
eb6e199b 3742 cqr->retries = 256;
1aae0560 3743 cqr->buildclk = get_tod_clock();
17283b56
CH		 3744 cqr->status = DASD_CQR_FILLED;
3745 return cqr;
3746}
3747
3748
68b781fe 3749int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
92636b15 3750 void *rdc_buffer, int rdc_buffer_size)
17283b56
CH		 3751{
3752 int ret;
3753 struct dasd_ccw_req *cqr;
3754
92636b15 3755 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
17283b56
CH		 3756 magic);
3757 if (IS_ERR(cqr))
3758 return PTR_ERR(cqr);
3759
3760 ret = dasd_sleep_on(cqr);
8e09f215 3761 dasd_sfree_request(cqr, cqr->memdev);
17283b56
CH		 3762 return ret;
3763}
aaff0f64 3764EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
20c64468 3765
f3eb5384
SW		 3766/*
3767 * In command mode and transport mode we need to look for sense
3768 * data in different places. The sense data itself is allways
3769 * an array of 32 bytes, so we can unify the sense data access
3770 * for both modes.
3771 */
3772char *dasd_get_sense(struct irb *irb)
3773{
3774 struct tsb *tsb = NULL;
3775 char *sense = NULL;
3776
3777 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3778 if (irb->scsw.tm.tcw)
3779 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3780 irb->scsw.tm.tcw);
3781 if (tsb && tsb->length == 64 && tsb->flags)
3782 switch (tsb->flags & 0x07) {
3783 case 1: /* tsa_iostat */
3784 sense = tsb->tsa.iostat.sense;
3785 break;
3786 case 2: /* tsa_ddpc */
3787 sense = tsb->tsa.ddpc.sense;
3788 break;
3789 default:
3790 /* currently we don't use interrogate data */
3791 break;
3792 }
3793 } else if (irb->esw.esw0.erw.cons) {
3794 sense = irb->ecw;
3795 }
3796 return sense;
3797}
3798EXPORT_SYMBOL_GPL(dasd_get_sense);
3799
4679e893
SH		 3800void dasd_generic_shutdown(struct ccw_device *cdev)
3801{
3802 struct dasd_device *device;
3803
3804 device = dasd_device_from_cdev(cdev);
3805 if (IS_ERR(device))
3806 return;
3807
3808 if (device->block)
3809 dasd_schedule_block_bh(device->block);
3810
3811 dasd_schedule_device_bh(device);
3812
3813 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3814}
3815EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3816
8e09f215 3817static int __init dasd_init(void)
1da177e4
LT		 3818{
3819 int rc;
3820
3821 init_waitqueue_head(&dasd_init_waitq);
8f61701b 3822 init_waitqueue_head(&dasd_flush_wq);
c80ee724 3823 init_waitqueue_head(&generic_waitq);
4679e893 3824 init_waitqueue_head(&shutdown_waitq);
1da177e4
LT		 3825
3826 /* register 'common' DASD debug area, used for all DBF_XXX calls */
361f494d 3827 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
1da177e4
LT		 3828 if (dasd_debug_area == NULL) {
3829 rc = -ENOMEM;
3830 goto failed;
3831 }
3832 debug_register_view(dasd_debug_area, &debug_sprintf_view);
b0035f12 3833 debug_set_level(dasd_debug_area, DBF_WARNING);
1da177e4
LT		 3834
3835 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3836
3837 dasd_diag_discipline_pointer = NULL;
3838
4fa52aa7
SW		 3839 dasd_statistics_createroot();
3840
1da177e4
LT		 3841 rc = dasd_devmap_init();
3842 if (rc)
3843 goto failed;
3844 rc = dasd_gendisk_init();
3845 if (rc)
3846 goto failed;
3847 rc = dasd_parse();
3848 if (rc)
3849 goto failed;
20c64468
SW		 3850 rc = dasd_eer_init();
3851 if (rc)
3852 goto failed;
1da177e4
LT		 3853#ifdef CONFIG_PROC_FS
3854 rc = dasd_proc_init();
3855 if (rc)
3856 goto failed;
3857#endif
3858
3859 return 0;
3860failed:
fc19f381 3861 pr_info("The DASD device driver could not be initialized\n");
1da177e4
LT		 3862 dasd_exit();
3863 return rc;
3864}
3865
3866module_init(dasd_init);
3867module_exit(dasd_exit);
Linux kernel - Deliverables
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