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s390/dasd: fix unresumed device after suspend/resume
[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. */
f2608cd4
SH		 582 if (!schedule_work(&device->kick_work))
583 dasd_put_device(device);
1da177e4 584}
7048a2b5 585EXPORT_SYMBOL(dasd_kick_device);
1da177e4 586
501183f2
SH		 587/*
588 * dasd_reload_device will schedule a call do do_reload_device to the kernel
589 * event daemon.
590 */
591static void do_reload_device(struct work_struct *work)
592{
593 struct dasd_device *device = container_of(work, struct dasd_device,
594 reload_device);
595 device->discipline->reload(device);
596 dasd_put_device(device);
597}
598
599void dasd_reload_device(struct dasd_device *device)
600{
601 dasd_get_device(device);
602 /* queue call to dasd_reload_device to the kernel event daemon. */
f2608cd4
SH		 603 if (!schedule_work(&device->reload_device))
604 dasd_put_device(device);
501183f2
SH		 605}
606EXPORT_SYMBOL(dasd_reload_device);
607
d41dd122
SH		 608/*
609 * dasd_restore_device will schedule a call do do_restore_device to the kernel
610 * event daemon.
611 */
612static void do_restore_device(struct work_struct *work)
613{
614 struct dasd_device *device = container_of(work, struct dasd_device,
615 restore_device);
616 device->cdev->drv->restore(device->cdev);
617 dasd_put_device(device);
618}
619
620void dasd_restore_device(struct dasd_device *device)
621{
622 dasd_get_device(device);
623 /* queue call to dasd_restore_device to the kernel event daemon. */
f2608cd4
SH		 624 if (!schedule_work(&device->restore_device))
625 dasd_put_device(device);
d41dd122
SH		 626}
627
1da177e4
LT		 628/*
629 * Set the target state for a device and starts the state change.
630 */
8e09f215 631void dasd_set_target_state(struct dasd_device *device, int target)
1da177e4 632{
f3445a1a 633 dasd_get_device(device);
9eb25122 634 mutex_lock(&device->state_mutex);
1da177e4
LT		 635 /* If we are in probeonly mode stop at DASD_STATE_READY. */
636 if (dasd_probeonly && target > DASD_STATE_READY)
637 target = DASD_STATE_READY;
638 if (device->target != target) {
9eb25122 639 if (device->state == target)
1da177e4
LT		 640 wake_up(&dasd_init_waitq);
641 device->target = target;
642 }
643 if (device->state != device->target)
644 dasd_change_state(device);
9eb25122
SH		 645 mutex_unlock(&device->state_mutex);
646 dasd_put_device(device);
1da177e4 647}
7048a2b5 648EXPORT_SYMBOL(dasd_set_target_state);
1da177e4
LT		 649
650/*
651 * Enable devices with device numbers in [from..to].
652 */
8e09f215 653static inline int _wait_for_device(struct dasd_device *device)
1da177e4
LT		 654{
655 return (device->state == device->target);
656}
657
8e09f215 658void dasd_enable_device(struct dasd_device *device)
1da177e4
LT		 659{
660 dasd_set_target_state(device, DASD_STATE_ONLINE);
661 if (device->state <= DASD_STATE_KNOWN)
662 /* No discipline for device found. */
663 dasd_set_target_state(device, DASD_STATE_NEW);
664 /* Now wait for the devices to come up. */
665 wait_event(dasd_init_waitq, _wait_for_device(device));
25e2cf1c
SH		 666
667 dasd_reload_device(device);
668 if (device->discipline->kick_validate)
669 device->discipline->kick_validate(device);
1da177e4 670}
7048a2b5 671EXPORT_SYMBOL(dasd_enable_device);
1da177e4
LT		 672
673/*
674 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
675 */
1da177e4 676
4fa52aa7 677unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
1da177e4 678
4fa52aa7 679#ifdef CONFIG_DASD_PROFILE
8ea55c95 680struct dasd_profile dasd_global_profile = {
8ea55c95
SO		 681 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock),
682};
4fa52aa7 683static struct dentry *dasd_debugfs_global_entry;
1da177e4
LT		 684
685/*
686 * Add profiling information for cqr before execution.
687 */
8e09f215
SW		 688static void dasd_profile_start(struct dasd_block *block,
689 struct dasd_ccw_req *cqr,
690 struct request *req)
1da177e4
LT		 691{
692 struct list_head *l;
693 unsigned int counter;
4fa52aa7 694 struct dasd_device *device;
1da177e4
LT		 695
696 /* count the length of the chanq for statistics */
697 counter = 0;
4fa52aa7
SW		 698 if (dasd_global_profile_level || block->profile.data)
699 list_for_each(l, &block->ccw_queue)
700 if (++counter >= 31)
701 break;
702
8ea55c95 703 spin_lock(&dasd_global_profile.lock);
6765cc2a 704 if (dasd_global_profile.data) {
8ea55c95 705 dasd_global_profile.data->dasd_io_nr_req[counter]++;
4fa52aa7 706 if (rq_data_dir(req) == READ)
8ea55c95 707 dasd_global_profile.data->dasd_read_nr_req[counter]++;
4fa52aa7 708 }
8ea55c95 709 spin_unlock(&dasd_global_profile.lock);
4fa52aa7
SW		 710
711 spin_lock(&block->profile.lock);
c81a90c8 712 if (block->profile.data) {
4fa52aa7
SW		 713 block->profile.data->dasd_io_nr_req[counter]++;
714 if (rq_data_dir(req) == READ)
715 block->profile.data->dasd_read_nr_req[counter]++;
c81a90c8 716 }
4fa52aa7
SW		 717 spin_unlock(&block->profile.lock);
718
719 /*
720 * We count the request for the start device, even though it may run on
721 * some other device due to error recovery. This way we make sure that
722 * we count each request only once.
723 */
724 device = cqr->startdev;
725 if (device->profile.data) {
726 counter = 1; /* request is not yet queued on the start device */
727 list_for_each(l, &device->ccw_queue)
728 if (++counter >= 31)
729 break;
730 }
731 spin_lock(&device->profile.lock);
732 if (device->profile.data) {
733 device->profile.data->dasd_io_nr_req[counter]++;
734 if (rq_data_dir(req) == READ)
735 device->profile.data->dasd_read_nr_req[counter]++;
736 }
737 spin_unlock(&device->profile.lock);
1da177e4
LT		 738}
739
740/*
741 * Add profiling information for cqr after execution.
742 */
4fa52aa7
SW		 743
744#define dasd_profile_counter(value, index) \
745{ \
746 for (index = 0; index < 31 && value >> (2+index); index++) \
747 ; \
748}
749
750static void dasd_profile_end_add_data(struct dasd_profile_info *data,
751 int is_alias,
752 int is_tpm,
753 int is_read,
754 long sectors,
755 int sectors_ind,
756 int tottime_ind,
757 int tottimeps_ind,
758 int strtime_ind,
759 int irqtime_ind,
760 int irqtimeps_ind,
761 int endtime_ind)
762{
763 /* in case of an overflow, reset the whole profile */
764 if (data->dasd_io_reqs == UINT_MAX) {
765 memset(data, 0, sizeof(*data));
766 getnstimeofday(&data->starttod);
767 }
768 data->dasd_io_reqs++;
769 data->dasd_io_sects += sectors;
770 if (is_alias)
771 data->dasd_io_alias++;
772 if (is_tpm)
773 data->dasd_io_tpm++;
774
775 data->dasd_io_secs[sectors_ind]++;
776 data->dasd_io_times[tottime_ind]++;
777 data->dasd_io_timps[tottimeps_ind]++;
778 data->dasd_io_time1[strtime_ind]++;
779 data->dasd_io_time2[irqtime_ind]++;
780 data->dasd_io_time2ps[irqtimeps_ind]++;
781 data->dasd_io_time3[endtime_ind]++;
782
783 if (is_read) {
784 data->dasd_read_reqs++;
785 data->dasd_read_sects += sectors;
786 if (is_alias)
787 data->dasd_read_alias++;
788 if (is_tpm)
789 data->dasd_read_tpm++;
790 data->dasd_read_secs[sectors_ind]++;
791 data->dasd_read_times[tottime_ind]++;
792 data->dasd_read_time1[strtime_ind]++;
793 data->dasd_read_time2[irqtime_ind]++;
794 data->dasd_read_time3[endtime_ind]++;
795 }
796}
797
8e09f215
SW		 798static void dasd_profile_end(struct dasd_block *block,
799 struct dasd_ccw_req *cqr,
800 struct request *req)
1da177e4
LT		 801{
802 long strtime, irqtime, endtime, tottime; /* in microseconds */
803 long tottimeps, sectors;
4fa52aa7
SW		 804 struct dasd_device *device;
805 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
806 int irqtime_ind, irqtimeps_ind, endtime_ind;
1da177e4 807
4fa52aa7
SW		 808 device = cqr->startdev;
809 if (!(dasd_global_profile_level ||
810 block->profile.data ||
811 device->profile.data))
1da177e4
LT		 812 return;
813
83096ebf 814 sectors = blk_rq_sectors(req);
1da177e4
LT		 815 if (!cqr->buildclk || !cqr->startclk ||
816 !cqr->stopclk || !cqr->endclk ||
817 !sectors)
818 return;
819
820 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
821 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
822 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
823 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
824 tottimeps = tottime / sectors;
825
4fa52aa7
SW		 826 dasd_profile_counter(sectors, sectors_ind);
827 dasd_profile_counter(tottime, tottime_ind);
828 dasd_profile_counter(tottimeps, tottimeps_ind);
829 dasd_profile_counter(strtime, strtime_ind);
830 dasd_profile_counter(irqtime, irqtime_ind);
831 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
832 dasd_profile_counter(endtime, endtime_ind);
833
8ea55c95 834 spin_lock(&dasd_global_profile.lock);
6765cc2a 835 if (dasd_global_profile.data) {
8ea55c95 836 dasd_profile_end_add_data(dasd_global_profile.data,
4fa52aa7
SW		 837 cqr->startdev != block->base,
838 cqr->cpmode == 1,
839 rq_data_dir(req) == READ,
840 sectors, sectors_ind, tottime_ind,
841 tottimeps_ind, strtime_ind,
842 irqtime_ind, irqtimeps_ind,
843 endtime_ind);
844 }
8ea55c95 845 spin_unlock(&dasd_global_profile.lock);
4fa52aa7
SW		 846
847 spin_lock(&block->profile.lock);
848 if (block->profile.data)
849 dasd_profile_end_add_data(block->profile.data,
850 cqr->startdev != block->base,
851 cqr->cpmode == 1,
852 rq_data_dir(req) == READ,
853 sectors, sectors_ind, tottime_ind,
854 tottimeps_ind, strtime_ind,
855 irqtime_ind, irqtimeps_ind,
856 endtime_ind);
857 spin_unlock(&block->profile.lock);
858
859 spin_lock(&device->profile.lock);
860 if (device->profile.data)
861 dasd_profile_end_add_data(device->profile.data,
862 cqr->startdev != block->base,
863 cqr->cpmode == 1,
864 rq_data_dir(req) == READ,
865 sectors, sectors_ind, tottime_ind,
866 tottimeps_ind, strtime_ind,
867 irqtime_ind, irqtimeps_ind,
868 endtime_ind);
869 spin_unlock(&device->profile.lock);
870}
871
872void dasd_profile_reset(struct dasd_profile *profile)
873{
874 struct dasd_profile_info *data;
875
876 spin_lock_bh(&profile->lock);
877 data = profile->data;
878 if (!data) {
879 spin_unlock_bh(&profile->lock);
880 return;
881 }
882 memset(data, 0, sizeof(*data));
883 getnstimeofday(&data->starttod);
884 spin_unlock_bh(&profile->lock);
885}
886
4fa52aa7
SW		 887int dasd_profile_on(struct dasd_profile *profile)
888{
889 struct dasd_profile_info *data;
890
891 data = kzalloc(sizeof(*data), GFP_KERNEL);
892 if (!data)
893 return -ENOMEM;
894 spin_lock_bh(&profile->lock);
895 if (profile->data) {
896 spin_unlock_bh(&profile->lock);
897 kfree(data);
898 return 0;
899 }
900 getnstimeofday(&data->starttod);
901 profile->data = data;
902 spin_unlock_bh(&profile->lock);
903 return 0;
904}
905
906void dasd_profile_off(struct dasd_profile *profile)
907{
908 spin_lock_bh(&profile->lock);
909 kfree(profile->data);
910 profile->data = NULL;
911 spin_unlock_bh(&profile->lock);
912}
913
914char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
915{
916 char *buffer;
917
e4258d55 918 buffer = vmalloc(user_len + 1);
4fa52aa7
SW		 919 if (buffer == NULL)
920 return ERR_PTR(-ENOMEM);
921 if (copy_from_user(buffer, user_buf, user_len) != 0) {
e4258d55 922 vfree(buffer);
4fa52aa7
SW		 923 return ERR_PTR(-EFAULT);
924 }
925 /* got the string, now strip linefeed. */
926 if (buffer[user_len - 1] == '\n')
927 buffer[user_len - 1] = 0;
928 else
929 buffer[user_len] = 0;
930 return buffer;
1da177e4 931}
4fa52aa7
SW		 932
933static ssize_t dasd_stats_write(struct file *file,
934 const char __user *user_buf,
935 size_t user_len, loff_t *pos)
936{
937 char *buffer, *str;
938 int rc;
939 struct seq_file *m = (struct seq_file *)file->private_data;
940 struct dasd_profile *prof = m->private;
941
942 if (user_len > 65536)
943 user_len = 65536;
944 buffer = dasd_get_user_string(user_buf, user_len);
945 if (IS_ERR(buffer))
946 return PTR_ERR(buffer);
947
948 str = skip_spaces(buffer);
949 rc = user_len;
950 if (strncmp(str, "reset", 5) == 0) {
951 dasd_profile_reset(prof);
952 } else if (strncmp(str, "on", 2) == 0) {
953 rc = dasd_profile_on(prof);
6765cc2a
SO		 954 if (rc)
955 goto out;
956 rc = user_len;
957 if (prof == &dasd_global_profile) {
958 dasd_profile_reset(prof);
959 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
960 }
4fa52aa7 961 } else if (strncmp(str, "off", 3) == 0) {
6765cc2a
SO		 962 if (prof == &dasd_global_profile)
963 dasd_global_profile_level = DASD_PROFILE_OFF;
4fa52aa7
SW		 964 dasd_profile_off(prof);
965 } else
966 rc = -EINVAL;
6765cc2a 967out:
e4258d55 968 vfree(buffer);
4fa52aa7
SW		 969 return rc;
970}
971
972static void dasd_stats_array(struct seq_file *m, unsigned int *array)
973{
974 int i;
975
976 for (i = 0; i < 32; i++)
977 seq_printf(m, "%u ", array[i]);
978 seq_putc(m, '\n');
979}
980
981static void dasd_stats_seq_print(struct seq_file *m,
982 struct dasd_profile_info *data)
983{
984 seq_printf(m, "start_time %ld.%09ld\n",
985 data->starttod.tv_sec, data->starttod.tv_nsec);
986 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
987 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
988 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
989 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
c794caf9 990 seq_puts(m, "histogram_sectors ");
4fa52aa7 991 dasd_stats_array(m, data->dasd_io_secs);
c794caf9 992 seq_puts(m, "histogram_io_times ");
4fa52aa7 993 dasd_stats_array(m, data->dasd_io_times);
c794caf9 994 seq_puts(m, "histogram_io_times_weighted ");
4fa52aa7 995 dasd_stats_array(m, data->dasd_io_timps);
c794caf9 996 seq_puts(m, "histogram_time_build_to_ssch ");
4fa52aa7 997 dasd_stats_array(m, data->dasd_io_time1);
c794caf9 998 seq_puts(m, "histogram_time_ssch_to_irq ");
4fa52aa7 999 dasd_stats_array(m, data->dasd_io_time2);
c794caf9 1000 seq_puts(m, "histogram_time_ssch_to_irq_weighted ");
4fa52aa7 1001 dasd_stats_array(m, data->dasd_io_time2ps);
c794caf9 1002 seq_puts(m, "histogram_time_irq_to_end ");
4fa52aa7 1003 dasd_stats_array(m, data->dasd_io_time3);
c794caf9 1004 seq_puts(m, "histogram_ccw_queue_length ");
4fa52aa7
SW		 1005 dasd_stats_array(m, data->dasd_io_nr_req);
1006 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
1007 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
1008 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
1009 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
c794caf9 1010 seq_puts(m, "histogram_read_sectors ");
4fa52aa7 1011 dasd_stats_array(m, data->dasd_read_secs);
c794caf9 1012 seq_puts(m, "histogram_read_times ");
4fa52aa7 1013 dasd_stats_array(m, data->dasd_read_times);
c794caf9 1014 seq_puts(m, "histogram_read_time_build_to_ssch ");
4fa52aa7 1015 dasd_stats_array(m, data->dasd_read_time1);
c794caf9 1016 seq_puts(m, "histogram_read_time_ssch_to_irq ");
4fa52aa7 1017 dasd_stats_array(m, data->dasd_read_time2);
c794caf9 1018 seq_puts(m, "histogram_read_time_irq_to_end ");
4fa52aa7 1019 dasd_stats_array(m, data->dasd_read_time3);
c794caf9 1020 seq_puts(m, "histogram_read_ccw_queue_length ");
4fa52aa7
SW		 1021 dasd_stats_array(m, data->dasd_read_nr_req);
1022}
1023
1024static int dasd_stats_show(struct seq_file *m, void *v)
1025{
1026 struct dasd_profile *profile;
1027 struct dasd_profile_info *data;
1028
1029 profile = m->private;
1030 spin_lock_bh(&profile->lock);
1031 data = profile->data;
1032 if (!data) {
1033 spin_unlock_bh(&profile->lock);
c794caf9 1034 seq_puts(m, "disabled\n");
4fa52aa7
SW		 1035 return 0;
1036 }
1037 dasd_stats_seq_print(m, data);
1038 spin_unlock_bh(&profile->lock);
1039 return 0;
1040}
1041
1042static int dasd_stats_open(struct inode *inode, struct file *file)
1043{
1044 struct dasd_profile *profile = inode->i_private;
1045 return single_open(file, dasd_stats_show, profile);
1046}
1047
1048static const struct file_operations dasd_stats_raw_fops = {
1049 .owner = THIS_MODULE,
1050 .open = dasd_stats_open,
1051 .read = seq_read,
1052 .llseek = seq_lseek,
1053 .release = single_release,
1054 .write = dasd_stats_write,
1055};
1056
4fa52aa7
SW		 1057static void dasd_profile_init(struct dasd_profile *profile,
1058 struct dentry *base_dentry)
1059{
f4ae40a6 1060 umode_t mode;
4fa52aa7
SW		 1061 struct dentry *pde;
1062
1063 if (!base_dentry)
1064 return;
1065 profile->dentry = NULL;
1066 profile->data = NULL;
1067 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1068 pde = debugfs_create_file("statistics", mode, base_dentry,
1069 profile, &dasd_stats_raw_fops);
1070 if (pde && !IS_ERR(pde))
1071 profile->dentry = pde;
1072 return;
1073}
1074
1075static void dasd_profile_exit(struct dasd_profile *profile)
1076{
1077 dasd_profile_off(profile);
d7309aaa
FF		 1078 debugfs_remove(profile->dentry);
1079 profile->dentry = NULL;
4fa52aa7
SW		 1080}
1081
1082static void dasd_statistics_removeroot(void)
1083{
1084 dasd_global_profile_level = DASD_PROFILE_OFF;
6765cc2a 1085 dasd_profile_exit(&dasd_global_profile);
d7309aaa
FF		 1086 debugfs_remove(dasd_debugfs_global_entry);
1087 debugfs_remove(dasd_debugfs_root_entry);
4fa52aa7
SW		 1088}
1089
1090static void dasd_statistics_createroot(void)
1091{
4fa52aa7
SW		 1092 struct dentry *pde;
1093
1094 dasd_debugfs_root_entry = NULL;
4fa52aa7
SW		 1095 pde = debugfs_create_dir("dasd", NULL);
1096 if (!pde || IS_ERR(pde))
1097 goto error;
1098 dasd_debugfs_root_entry = pde;
1099 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1100 if (!pde || IS_ERR(pde))
1101 goto error;
1102 dasd_debugfs_global_entry = pde;
6765cc2a 1103 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry);
4fa52aa7
SW		 1104 return;
1105
1106error:
1107 DBF_EVENT(DBF_ERR, "%s",
1108 "Creation of the dasd debugfs interface failed");
1109 dasd_statistics_removeroot();
1110 return;
1111}
1112
1da177e4 1113#else
8e09f215
SW		 1114#define dasd_profile_start(block, cqr, req) do {} while (0)
1115#define dasd_profile_end(block, cqr, req) do {} while (0)
4fa52aa7
SW		 1116
1117static void dasd_statistics_createroot(void)
1118{
1119 return;
1120}
1121
1122static void dasd_statistics_removeroot(void)
1123{
1124 return;
1125}
1126
1127int dasd_stats_generic_show(struct seq_file *m, void *v)
1128{
c794caf9 1129 seq_puts(m, "Statistics are not activated in this kernel\n");
4fa52aa7
SW		 1130 return 0;
1131}
1132
1133static void dasd_profile_init(struct dasd_profile *profile,
1134 struct dentry *base_dentry)
1135{
1136 return;
1137}
1138
1139static void dasd_profile_exit(struct dasd_profile *profile)
1140{
1141 return;
1142}
1143
1144int dasd_profile_on(struct dasd_profile *profile)
1145{
1146 return 0;
1147}
1148
1da177e4
LT		 1149#endif /* CONFIG_DASD_PROFILE */
1150
1151/*
1152 * Allocate memory for a channel program with 'cplength' channel
1153 * command words and 'datasize' additional space. There are two
1154 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1155 * memory and 2) dasd_smalloc_request uses the static ccw memory
1156 * that gets allocated for each device.
1157 */
68b781fe 1158struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
8e09f215
SW		 1159 int datasize,
1160 struct dasd_device *device)
1da177e4
LT		 1161{
1162 struct dasd_ccw_req *cqr;
1163
1164 /* Sanity checks */
68b781fe 1165 BUG_ON(datasize > PAGE_SIZE ||
7ac1e877 1166 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1da177e4 1167
88abaab4 1168 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1da177e4
LT		 1169 if (cqr == NULL)
1170 return ERR_PTR(-ENOMEM);
1da177e4
LT		 1171 cqr->cpaddr = NULL;
1172 if (cplength > 0) {
88abaab4 1173 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1da177e4
LT		 1174 GFP_ATOMIC | GFP_DMA);
1175 if (cqr->cpaddr == NULL) {
1176 kfree(cqr);
1177 return ERR_PTR(-ENOMEM);
1178 }
1da177e4
LT		 1179 }
1180 cqr->data = NULL;
1181 if (datasize > 0) {
88abaab4 1182 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1da177e4 1183 if (cqr->data == NULL) {
17fd682e 1184 kfree(cqr->cpaddr);
1da177e4
LT		 1185 kfree(cqr);
1186 return ERR_PTR(-ENOMEM);
1187 }
1da177e4 1188 }
68b781fe 1189 cqr->magic = magic;
1da177e4
LT		 1190 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1191 dasd_get_device(device);
1192 return cqr;
1193}
7048a2b5 1194EXPORT_SYMBOL(dasd_kmalloc_request);
1da177e4 1195
68b781fe 1196struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
8e09f215
SW		 1197 int datasize,
1198 struct dasd_device *device)
1da177e4
LT		 1199{
1200 unsigned long flags;
1201 struct dasd_ccw_req *cqr;
1202 char *data;
1203 int size;
1204
1da177e4
LT		 1205 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1206 if (cplength > 0)
1207 size += cplength * sizeof(struct ccw1);
1208 if (datasize > 0)
1209 size += datasize;
1210 spin_lock_irqsave(&device->mem_lock, flags);
1211 cqr = (struct dasd_ccw_req *)
1212 dasd_alloc_chunk(&device->ccw_chunks, size);
1213 spin_unlock_irqrestore(&device->mem_lock, flags);
1214 if (cqr == NULL)
1215 return ERR_PTR(-ENOMEM);
1216 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1217 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1218 cqr->cpaddr = NULL;
1219 if (cplength > 0) {
1220 cqr->cpaddr = (struct ccw1 *) data;
1221 data += cplength*sizeof(struct ccw1);
1222 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1223 }
1224 cqr->data = NULL;
1225 if (datasize > 0) {
1226 cqr->data = data;
1227 memset(cqr->data, 0, datasize);
1228 }
68b781fe 1229 cqr->magic = magic;
1da177e4
LT		 1230 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1231 dasd_get_device(device);
1232 return cqr;
1233}
7048a2b5 1234EXPORT_SYMBOL(dasd_smalloc_request);
1da177e4
LT		 1235
1236/*
1237 * Free memory of a channel program. This function needs to free all the
1238 * idal lists that might have been created by dasd_set_cda and the
1239 * struct dasd_ccw_req itself.
1240 */
8e09f215 1241void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4 1242{
1da177e4
LT		 1243 struct ccw1 *ccw;
1244
1245 /* Clear any idals used for the request. */
1246 ccw = cqr->cpaddr;
1247 do {
1248 clear_normalized_cda(ccw);
1249 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
17fd682e
JJ		 1250 kfree(cqr->cpaddr);
1251 kfree(cqr->data);
1da177e4
LT		 1252 kfree(cqr);
1253 dasd_put_device(device);
1254}
7048a2b5 1255EXPORT_SYMBOL(dasd_kfree_request);
1da177e4 1256
8e09f215 1257void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4
LT		 1258{
1259 unsigned long flags;
1260
1261 spin_lock_irqsave(&device->mem_lock, flags);
1262 dasd_free_chunk(&device->ccw_chunks, cqr);
1263 spin_unlock_irqrestore(&device->mem_lock, flags);
1264 dasd_put_device(device);
1265}
7048a2b5 1266EXPORT_SYMBOL(dasd_sfree_request);
1da177e4
LT		 1267
1268/*
1269 * Check discipline magic in cqr.
1270 */
8e09f215 1271static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1da177e4
LT		 1272{
1273 struct dasd_device *device;
1274
1275 if (cqr == NULL)
1276 return -EINVAL;
8e09f215 1277 device = cqr->startdev;
1da177e4 1278 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
fc19f381 1279 DBF_DEV_EVENT(DBF_WARNING, device,
1da177e4
LT		 1280 " dasd_ccw_req 0x%08x magic doesn't match"
1281 " discipline 0x%08x",
1282 cqr->magic,
1283 *(unsigned int *) device->discipline->name);
1284 return -EINVAL;
1285 }
1286 return 0;
1287}
1288
1289/*
1290 * Terminate the current i/o and set the request to clear_pending.
1291 * Timer keeps device runnig.
1292 * ccw_device_clear can fail if the i/o subsystem
1293 * is in a bad mood.
1294 */
8e09f215 1295int dasd_term_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 1296{
1297 struct dasd_device *device;
1298 int retries, rc;
fc19f381 1299 char errorstring[ERRORLENGTH];
1da177e4
LT		 1300
1301 /* Check the cqr */
1302 rc = dasd_check_cqr(cqr);
1303 if (rc)
1304 return rc;
1305 retries = 0;
8e09f215 1306 device = (struct dasd_device *) cqr->startdev;
1da177e4
LT		 1307 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1308 rc = ccw_device_clear(device->cdev, (long) cqr);
1309 switch (rc) {
1310 case 0: /* termination successful */
8e09f215 1311 cqr->status = DASD_CQR_CLEAR_PENDING;
1aae0560 1312 cqr->stopclk = get_tod_clock();
8f61701b 1313 cqr->starttime = 0;
1da177e4
LT		 1314 DBF_DEV_EVENT(DBF_DEBUG, device,
1315 "terminate cqr %p successful",
1316 cqr);
1317 break;
1318 case -ENODEV:
1319 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1320 "device gone, retry");
1321 break;
1322 case -EIO:
1323 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1324 "I/O error, retry");
1325 break;
1326 case -EINVAL:
2c17124b
SH		 1327 /*
1328 * device not valid so no I/O could be running
1329 * handle CQR as termination successful
1330 */
1331 cqr->status = DASD_CQR_CLEARED;
1332 cqr->stopclk = get_tod_clock();
1333 cqr->starttime = 0;
1334 /* no retries for invalid devices */
1335 cqr->retries = -1;
1336 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1337 "EINVAL, handle as terminated");
1338 /* fake rc to success */
1339 rc = 0;
1340 break;
1da177e4
LT		 1341 case -EBUSY:
1342 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1343 "device busy, retry later");
1344 break;
1345 default:
fc19f381
SH		 1346 /* internal error 10 - unknown rc*/
1347 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1348 dev_err(&device->cdev->dev, "An error occurred in the "
1349 "DASD device driver, reason=%s\n", errorstring);
1da177e4
LT		 1350 BUG();
1351 break;
1352 }
1353 retries++;
1354 }
8e09f215 1355 dasd_schedule_device_bh(device);
1da177e4
LT		 1356 return rc;
1357}
7048a2b5 1358EXPORT_SYMBOL(dasd_term_IO);
1da177e4
LT		 1359
1360/*
1361 * Start the i/o. This start_IO can fail if the channel is really busy.
1362 * In that case set up a timer to start the request later.
1363 */
8e09f215 1364int dasd_start_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 1365{
1366 struct dasd_device *device;
1367 int rc;
fc19f381 1368 char errorstring[ERRORLENGTH];
1da177e4
LT		 1369
1370 /* Check the cqr */
1371 rc = dasd_check_cqr(cqr);
6cc7f168
SW		 1372 if (rc) {
1373 cqr->intrc = rc;
1da177e4 1374 return rc;
6cc7f168 1375 }
8e09f215 1376 device = (struct dasd_device *) cqr->startdev;
5a27e60d
SW		 1377 if (((cqr->block &&
1378 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1379 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1380 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1381 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1382 "because of stolen lock", cqr);
1383 cqr->status = DASD_CQR_ERROR;
1384 cqr->intrc = -EPERM;
1385 return -EPERM;
1386 }
1da177e4 1387 if (cqr->retries < 0) {
fc19f381
SH		 1388 /* internal error 14 - start_IO run out of retries */
1389 sprintf(errorstring, "14 %p", cqr);
1390 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1391 "device driver, reason=%s\n", errorstring);
8e09f215 1392 cqr->status = DASD_CQR_ERROR;
1da177e4
LT		 1393 return -EIO;
1394 }
1aae0560 1395 cqr->startclk = get_tod_clock();
1da177e4
LT		 1396 cqr->starttime = jiffies;
1397 cqr->retries--;
a4d26c6a
SW		 1398 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1399 cqr->lpm &= device->path_data.opm;
1400 if (!cqr->lpm)
1401 cqr->lpm = device->path_data.opm;
1402 }
f3eb5384
SW		 1403 if (cqr->cpmode == 1) {
1404 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1405 (long) cqr, cqr->lpm);
1406 } else {
1407 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1408 (long) cqr, cqr->lpm, 0);
1409 }
1da177e4
LT		 1410 switch (rc) {
1411 case 0:
1412 cqr->status = DASD_CQR_IN_IO;
1da177e4
LT		 1413 break;
1414 case -EBUSY:
a4d26c6a 1415 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 1416 "start_IO: device busy, retry later");
1417 break;
1418 case -ETIMEDOUT:
a4d26c6a 1419 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 1420 "start_IO: request timeout, retry later");
1421 break;
1422 case -EACCES:
a4d26c6a
SW		 1423 /* -EACCES indicates that the request used only a subset of the
1424 * available paths and all these paths are gone. If the lpm of
1425 * this request was only a subset of the opm (e.g. the ppm) then
1426 * we just do a retry with all available paths.
1427 * If we already use the full opm, something is amiss, and we
1428 * need a full path verification.
1da177e4 1429 */
a4d26c6a
SW		 1430 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1431 DBF_DEV_EVENT(DBF_WARNING, device,
1432 "start_IO: selected paths gone (%x)",
1433 cqr->lpm);
1434 } else if (cqr->lpm != device->path_data.opm) {
1435 cqr->lpm = device->path_data.opm;
1436 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1437 "start_IO: selected paths gone,"
1438 " retry on all paths");
1439 } else {
1440 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1441 "start_IO: all paths in opm gone,"
1442 " do path verification");
1443 dasd_generic_last_path_gone(device);
1444 device->path_data.opm = 0;
1445 device->path_data.ppm = 0;
1446 device->path_data.npm = 0;
1447 device->path_data.tbvpm =
1448 ccw_device_get_path_mask(device->cdev);
1449 }
1da177e4
LT		 1450 break;
1451 case -ENODEV:
a4d26c6a 1452 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384
SW		 1453 "start_IO: -ENODEV device gone, retry");
1454 break;
1da177e4 1455 case -EIO:
a4d26c6a 1456 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384 1457 "start_IO: -EIO device gone, retry");
1da177e4 1458 break;
d41dd122
SH		 1459 case -EINVAL:
1460 /* most likely caused in power management context */
a4d26c6a 1461 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
d41dd122
SH		 1462 "start_IO: -EINVAL device currently "
1463 "not accessible");
1464 break;
1da177e4 1465 default:
fc19f381
SH		 1466 /* internal error 11 - unknown rc */
1467 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1468 dev_err(&device->cdev->dev,
1469 "An error occurred in the DASD device driver, "
1470 "reason=%s\n", errorstring);
1da177e4
LT		 1471 BUG();
1472 break;
1473 }
6cc7f168 1474 cqr->intrc = rc;
1da177e4
LT		 1475 return rc;
1476}
7048a2b5 1477EXPORT_SYMBOL(dasd_start_IO);
1da177e4
LT		 1478
1479/*
1480 * Timeout function for dasd devices. This is used for different purposes
1481 * 1) missing interrupt handler for normal operation
1482 * 2) delayed start of request where start_IO failed with -EBUSY
1483 * 3) timeout for missing state change interrupts
1484 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1485 * DASD_CQR_QUEUED for 2) and 3).
1486 */
8e09f215 1487static void dasd_device_timeout(unsigned long ptr)
1da177e4
LT		 1488{
1489 unsigned long flags;
1490 struct dasd_device *device;
1491
1492 device = (struct dasd_device *) ptr;
1493 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1494 /* re-activate request queue */
eb6e199b 1495 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1da177e4 1496 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
8e09f215 1497 dasd_schedule_device_bh(device);
1da177e4
LT		 1498}
1499
1500/*
1501 * Setup timeout for a device in jiffies.
1502 */
8e09f215 1503void dasd_device_set_timer(struct dasd_device *device, int expires)
1da177e4 1504{
48cae885
SW		 1505 if (expires == 0)
1506 del_timer(&device->timer);
1507 else
1508 mod_timer(&device->timer, jiffies + expires);
1da177e4 1509}
7048a2b5 1510EXPORT_SYMBOL(dasd_device_set_timer);
1da177e4
LT		 1511
1512/*
1513 * Clear timeout for a device.
1514 */
8e09f215 1515void dasd_device_clear_timer(struct dasd_device *device)
1da177e4 1516{
48cae885 1517 del_timer(&device->timer);
1da177e4 1518}
7048a2b5 1519EXPORT_SYMBOL(dasd_device_clear_timer);
1da177e4 1520
8e09f215
SW		 1521static void dasd_handle_killed_request(struct ccw_device *cdev,
1522 unsigned long intparm)
1da177e4
LT		 1523{
1524 struct dasd_ccw_req *cqr;
1525 struct dasd_device *device;
1526
f16f5843
SW		 1527 if (!intparm)
1528 return;
1da177e4
LT		 1529 cqr = (struct dasd_ccw_req *) intparm;
1530 if (cqr->status != DASD_CQR_IN_IO) {
b8ed5dd5
SH		 1531 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1532 "invalid status in handle_killed_request: "
1533 "%02x", cqr->status);
1da177e4
LT		 1534 return;
1535 }
1536
589c74d5
SH		 1537 device = dasd_device_from_cdev_locked(cdev);
1538 if (IS_ERR(device)) {
1539 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1540 "unable to get device from cdev");
1541 return;
1542 }
1543
1544 if (!cqr->startdev ||
1545 device != cqr->startdev ||
1546 strncmp(cqr->startdev->discipline->ebcname,
1547 (char *) &cqr->magic, 4)) {
294001a8
SH		 1548 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1549 "invalid device in request");
589c74d5 1550 dasd_put_device(device);
1da177e4
LT		 1551 return;
1552 }
1553
1554 /* Schedule request to be retried. */
1555 cqr->status = DASD_CQR_QUEUED;
1556
8e09f215
SW		 1557 dasd_device_clear_timer(device);
1558 dasd_schedule_device_bh(device);
1da177e4
LT		 1559 dasd_put_device(device);
1560}
1561
8e09f215 1562void dasd_generic_handle_state_change(struct dasd_device *device)
1da177e4 1563{
20c64468
SW		 1564 /* First of all start sense subsystem status request. */
1565 dasd_eer_snss(device);
1566
eb6e199b 1567 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
8e09f215
SW		 1568 dasd_schedule_device_bh(device);
1569 if (device->block)
1570 dasd_schedule_block_bh(device->block);
1da177e4 1571}
7048a2b5 1572EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
1da177e4
LT		 1573
1574/*
1575 * Interrupt handler for "normal" ssch-io based dasd devices.
1576 */
8e09f215
SW		 1577void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1578 struct irb *irb)
1da177e4
LT		 1579{
1580 struct dasd_ccw_req *cqr, *next;
1581 struct dasd_device *device;
1582 unsigned long long now;
1583 int expires;
1da177e4
LT		 1584
1585 if (IS_ERR(irb)) {
1586 switch (PTR_ERR(irb)) {
1587 case -EIO:
1da177e4
LT		 1588 break;
1589 case -ETIMEDOUT:
b8ed5dd5
SH		 1590 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1591 "request timed out\n", __func__);
1da177e4
LT		 1592 break;
1593 default:
b8ed5dd5
SH		 1594 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1595 "unknown error %ld\n", __func__,
1596 PTR_ERR(irb));
1da177e4 1597 }
f16f5843 1598 dasd_handle_killed_request(cdev, intparm);
1da177e4
LT		 1599 return;
1600 }
1601
1aae0560 1602 now = get_tod_clock();
8e09f215 1603 cqr = (struct dasd_ccw_req *) intparm;
5a27e60d
SW		 1604 /* check for conditions that should be handled immediately */
1605 if (!cqr ||
1606 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1607 scsw_cstat(&irb->scsw) == 0)) {
a5a0061f
SW		 1608 if (cqr)
1609 memcpy(&cqr->irb, irb, sizeof(*irb));
a00bfd71 1610 device = dasd_device_from_cdev_locked(cdev);
56b86b61
SH		 1611 if (IS_ERR(device))
1612 return;
1613 /* ignore unsolicited interrupts for DIAG discipline */
1614 if (device->discipline == dasd_diag_discipline_pointer) {
1da177e4 1615 dasd_put_device(device);
56b86b61 1616 return;
1da177e4 1617 }
5a27e60d
SW		 1618 device->discipline->dump_sense_dbf(device, irb, "int");
1619 if (device->features & DASD_FEATURE_ERPLOG)
1620 device->discipline->dump_sense(device, cqr, irb);
1621 device->discipline->check_for_device_change(device, cqr, irb);
56b86b61 1622 dasd_put_device(device);
1da177e4 1623 }
5db8440c
SH		 1624
1625 /* check for for attention message */
1626 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
1627 device = dasd_device_from_cdev_locked(cdev);
1628 device->discipline->check_attention(device, irb->esw.esw1.lpum);
1629 dasd_put_device(device);
1630 }
1631
5a27e60d
SW		 1632 if (!cqr)
1633 return;
1da177e4 1634
8e09f215
SW		 1635 device = (struct dasd_device *) cqr->startdev;
1636 if (!device ||
1da177e4 1637 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
294001a8
SH		 1638 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1639 "invalid device in request");
1da177e4
LT		 1640 return;
1641 }
1642
1643 /* Check for clear pending */
8e09f215 1644 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
f3eb5384 1645 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
8e09f215
SW		 1646 cqr->status = DASD_CQR_CLEARED;
1647 dasd_device_clear_timer(device);
8f61701b 1648 wake_up(&dasd_flush_wq);
8e09f215 1649 dasd_schedule_device_bh(device);
1da177e4
LT		 1650 return;
1651 }
1652
f3eb5384 1653 /* check status - the request might have been killed by dyn detach */
1da177e4 1654 if (cqr->status != DASD_CQR_IN_IO) {
fc19f381
SH		 1655 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1656 "status %02x", dev_name(&cdev->dev), cqr->status);
1da177e4
LT		 1657 return;
1658 }
fc19f381 1659
8e09f215 1660 next = NULL;
1da177e4 1661 expires = 0;
f3eb5384
SW		 1662 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1663 scsw_cstat(&irb->scsw) == 0) {
8e09f215
SW		 1664 /* request was completed successfully */
1665 cqr->status = DASD_CQR_SUCCESS;
1da177e4
LT		 1666 cqr->stopclk = now;
1667 /* Start first request on queue if possible -> fast_io. */
8e09f215
SW		 1668 if (cqr->devlist.next != &device->ccw_queue) {
1669 next = list_entry(cqr->devlist.next,
1670 struct dasd_ccw_req, devlist);
1da177e4 1671 }
8e09f215 1672 } else { /* error */
6c5f57c7
SH		 1673 /*
1674 * If we don't want complex ERP for this request, then just
1675 * reset this and retry it in the fastpath
8e09f215 1676 */
6c5f57c7 1677 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
8e09f215 1678 cqr->retries > 0) {
a4d26c6a 1679 if (cqr->lpm == device->path_data.opm)
fc19f381
SH		 1680 DBF_DEV_EVENT(DBF_DEBUG, device,
1681 "default ERP in fastpath "
1682 "(%i retries left)",
1683 cqr->retries);
a4d26c6a
SW		 1684 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1685 cqr->lpm = device->path_data.opm;
8e09f215
SW		 1686 cqr->status = DASD_CQR_QUEUED;
1687 next = cqr;
1688 } else
1da177e4 1689 cqr->status = DASD_CQR_ERROR;
8e09f215
SW		 1690 }
1691 if (next && (next->status == DASD_CQR_QUEUED) &&
1692 (!device->stopped)) {
1693 if (device->discipline->start_IO(next) == 0)
1694 expires = next->expires;
1da177e4
LT		 1695 }
1696 if (expires != 0)
8e09f215 1697 dasd_device_set_timer(device, expires);
1da177e4 1698 else
8e09f215
SW		 1699 dasd_device_clear_timer(device);
1700 dasd_schedule_device_bh(device);
1da177e4 1701}
7048a2b5 1702EXPORT_SYMBOL(dasd_int_handler);
1da177e4 1703
a23ed009
SH		 1704enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1705{
1706 struct dasd_device *device;
1707
1708 device = dasd_device_from_cdev_locked(cdev);
1709
1710 if (IS_ERR(device))
1711 goto out;
1712 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1713 device->state != device->target ||
5a27e60d 1714 !device->discipline->check_for_device_change){
a23ed009
SH		 1715 dasd_put_device(device);
1716 goto out;
1717 }
5a27e60d
SW		 1718 if (device->discipline->dump_sense_dbf)
1719 device->discipline->dump_sense_dbf(device, irb, "uc");
1720 device->discipline->check_for_device_change(device, NULL, irb);
a23ed009
SH		 1721 dasd_put_device(device);
1722out:
1723 return UC_TODO_RETRY;
1724}
1725EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1726
1da177e4 1727/*
8e09f215
SW		 1728 * If we have an error on a dasd_block layer request then we cancel
1729 * and return all further requests from the same dasd_block as well.
1da177e4 1730 */
8e09f215
SW		 1731static void __dasd_device_recovery(struct dasd_device *device,
1732 struct dasd_ccw_req *ref_cqr)
1da177e4 1733{
8e09f215
SW		 1734 struct list_head *l, *n;
1735 struct dasd_ccw_req *cqr;
1da177e4 1736
8e09f215
SW		 1737 /*
1738 * only requeue request that came from the dasd_block layer
1739 */
1740 if (!ref_cqr->block)
1741 return;
1da177e4 1742
8e09f215
SW		 1743 list_for_each_safe(l, n, &device->ccw_queue) {
1744 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1745 if (cqr->status == DASD_CQR_QUEUED &&
1746 ref_cqr->block == cqr->block) {
1747 cqr->status = DASD_CQR_CLEARED;
1748 }
1749 }
1750};
1da177e4
LT		 1751
1752/*
8e09f215
SW		 1753 * Remove those ccw requests from the queue that need to be returned
1754 * to the upper layer.
1da177e4 1755 */
8e09f215
SW		 1756static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1757 struct list_head *final_queue)
1da177e4
LT		 1758{
1759 struct list_head *l, *n;
1760 struct dasd_ccw_req *cqr;
1da177e4 1761
1da177e4
LT		 1762 /* Process request with final status. */
1763 list_for_each_safe(l, n, &device->ccw_queue) {
8e09f215
SW		 1764 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1765
1fbdb8be 1766 /* Skip any non-final request. */
8e09f215
SW		 1767 if (cqr->status == DASD_CQR_QUEUED ||
1768 cqr->status == DASD_CQR_IN_IO ||
1769 cqr->status == DASD_CQR_CLEAR_PENDING)
1fbdb8be 1770 continue;
1da177e4 1771 if (cqr->status == DASD_CQR_ERROR) {
8e09f215 1772 __dasd_device_recovery(device, cqr);
20c64468 1773 }
1da177e4 1774 /* Rechain finished requests to final queue */
8e09f215 1775 list_move_tail(&cqr->devlist, final_queue);
1da177e4
LT		 1776 }
1777}
1778
1da177e4 1779/*
8e09f215
SW		 1780 * the cqrs from the final queue are returned to the upper layer
1781 * by setting a dasd_block state and calling the callback function
1da177e4 1782 */
8e09f215
SW		 1783static void __dasd_device_process_final_queue(struct dasd_device *device,
1784 struct list_head *final_queue)
1da177e4 1785{
8e09f215 1786 struct list_head *l, *n;
1da177e4 1787 struct dasd_ccw_req *cqr;
03513bcc 1788 struct dasd_block *block;
c80ee724
SH		 1789 void (*callback)(struct dasd_ccw_req *, void *data);
1790 void *callback_data;
fc19f381 1791 char errorstring[ERRORLENGTH];
f24acd45 1792
8e09f215
SW		 1793 list_for_each_safe(l, n, final_queue) {
1794 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1795 list_del_init(&cqr->devlist);
03513bcc 1796 block = cqr->block;
c80ee724
SH		 1797 callback = cqr->callback;
1798 callback_data = cqr->callback_data;
03513bcc
SW		 1799 if (block)
1800 spin_lock_bh(&block->queue_lock);
8e09f215
SW		 1801 switch (cqr->status) {
1802 case DASD_CQR_SUCCESS:
1803 cqr->status = DASD_CQR_DONE;
1804 break;
1805 case DASD_CQR_ERROR:
1806 cqr->status = DASD_CQR_NEED_ERP;
1807 break;
1808 case DASD_CQR_CLEARED:
1809 cqr->status = DASD_CQR_TERMINATED;
1810 break;
1811 default:
fc19f381
SH		 1812 /* internal error 12 - wrong cqr status*/
1813 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1814 dev_err(&device->cdev->dev,
1815 "An error occurred in the DASD device driver, "
1816 "reason=%s\n", errorstring);
8e09f215 1817 BUG();
1da177e4 1818 }
8e09f215 1819 if (cqr->callback != NULL)
c80ee724 1820 (callback)(cqr, callback_data);
03513bcc
SW		 1821 if (block)
1822 spin_unlock_bh(&block->queue_lock);
1da177e4
LT		 1823 }
1824}
1825
1826/*
1827 * Take a look at the first request on the ccw queue and check
1828 * if it reached its expire time. If so, terminate the IO.
1829 */
8e09f215 1830static void __dasd_device_check_expire(struct dasd_device *device)
1da177e4
LT		 1831{
1832 struct dasd_ccw_req *cqr;
1833
1834 if (list_empty(&device->ccw_queue))
1835 return;
8e09f215 1836 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
29145a6c
HH		 1837 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1838 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
d07dc5d8
SH		 1839 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1840 /*
1841 * IO in safe offline processing should not
1842 * run out of retries
1843 */
1844 cqr->retries++;
1845 }
29145a6c
HH		 1846 if (device->discipline->term_IO(cqr) != 0) {
1847 /* Hmpf, try again in 5 sec */
fc19f381 1848 dev_err(&device->cdev->dev,
625c94df 1849 "cqr %p timed out (%lus) but cannot be "
fc19f381
SH		 1850 "ended, retrying in 5 s\n",
1851 cqr, (cqr->expires/HZ));
7dc1da9f
SH		 1852 cqr->expires += 5*HZ;
1853 dasd_device_set_timer(device, 5*HZ);
29145a6c 1854 } else {
fc19f381 1855 dev_err(&device->cdev->dev,
625c94df 1856 "cqr %p timed out (%lus), %i retries "
fc19f381
SH		 1857 "remaining\n", cqr, (cqr->expires/HZ),
1858 cqr->retries);
1da177e4
LT		 1859 }
1860 }
1861}
1862
1863/*
1864 * Take a look at the first request on the ccw queue and check
1865 * if it needs to be started.
1866 */
8e09f215 1867static void __dasd_device_start_head(struct dasd_device *device)
1da177e4
LT		 1868{
1869 struct dasd_ccw_req *cqr;
1870 int rc;
1871
1872 if (list_empty(&device->ccw_queue))
1873 return;
8e09f215 1874 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
25ee4cf8
PO		 1875 if (cqr->status != DASD_CQR_QUEUED)
1876 return;
a4d26c6a
SW		 1877 /* when device is stopped, return request to previous layer
1878 * exception: only the disconnect or unresumed bits are set and the
1879 * cqr is a path verification request
1880 */
1881 if (device->stopped &&
1882 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1883 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1884 cqr->intrc = -EAGAIN;
8e09f215
SW		 1885 cqr->status = DASD_CQR_CLEARED;
1886 dasd_schedule_device_bh(device);
25ee4cf8 1887 return;
1c01b8a5 1888 }
25ee4cf8
PO		 1889
1890 rc = device->discipline->start_IO(cqr);
1891 if (rc == 0)
8e09f215 1892 dasd_device_set_timer(device, cqr->expires);
25ee4cf8 1893 else if (rc == -EACCES) {
8e09f215 1894 dasd_schedule_device_bh(device);
25ee4cf8
PO		 1895 } else
1896 /* Hmpf, try again in 1/2 sec */
8e09f215 1897 dasd_device_set_timer(device, 50);
8f61701b
HH		 1898}
1899
a4d26c6a
SW		 1900static void __dasd_device_check_path_events(struct dasd_device *device)
1901{
1902 int rc;
1903
1904 if (device->path_data.tbvpm) {
1905 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1906 DASD_UNRESUMED_PM))
1907 return;
1908 rc = device->discipline->verify_path(
1909 device, device->path_data.tbvpm);
1910 if (rc)
1911 dasd_device_set_timer(device, 50);
1912 else
1913 device->path_data.tbvpm = 0;
1914 }
1915};
1916
1da177e4 1917/*
8e09f215
SW		 1918 * Go through all request on the dasd_device request queue,
1919 * terminate them on the cdev if necessary, and return them to the
1920 * submitting layer via callback.
1921 * Note:
1922 * Make sure that all 'submitting layers' still exist when
1923 * this function is called!. In other words, when 'device' is a base
1924 * device then all block layer requests must have been removed before
1925 * via dasd_flush_block_queue.
1da177e4 1926 */
8e09f215 1927int dasd_flush_device_queue(struct dasd_device *device)
1da177e4 1928{
8e09f215
SW		 1929 struct dasd_ccw_req *cqr, *n;
1930 int rc;
1da177e4 1931 struct list_head flush_queue;
1da177e4
LT		 1932
1933 INIT_LIST_HEAD(&flush_queue);
1934 spin_lock_irq(get_ccwdev_lock(device->cdev));
8f61701b 1935 rc = 0;
8e09f215 1936 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
8f61701b
HH		 1937 /* Check status and move request to flush_queue */
1938 switch (cqr->status) {
1939 case DASD_CQR_IN_IO:
1940 rc = device->discipline->term_IO(cqr);
1941 if (rc) {
1942 /* unable to terminate requeust */
fc19f381
SH		 1943 dev_err(&device->cdev->dev,
1944 "Flushing the DASD request queue "
1945 "failed for request %p\n", cqr);
8f61701b
HH		 1946 /* stop flush processing */
1947 goto finished;
1948 }
1949 break;
1950 case DASD_CQR_QUEUED:
1aae0560 1951 cqr->stopclk = get_tod_clock();
8e09f215 1952 cqr->status = DASD_CQR_CLEARED;
8f61701b 1953 break;
8e09f215 1954 default: /* no need to modify the others */
8f61701b
HH		 1955 break;
1956 }
8e09f215 1957 list_move_tail(&cqr->devlist, &flush_queue);
8f61701b 1958 }
8f61701b
HH		 1959finished:
1960 spin_unlock_irq(get_ccwdev_lock(device->cdev));
8e09f215
SW		 1961 /*
1962 * After this point all requests must be in state CLEAR_PENDING,
1963 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1964 * one of the others.
1965 */
1966 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1967 wait_event(dasd_flush_wq,
1968 (cqr->status != DASD_CQR_CLEAR_PENDING));
1969 /*
1970 * Now set each request back to TERMINATED, DONE or NEED_ERP
1971 * and call the callback function of flushed requests
1972 */
1973 __dasd_device_process_final_queue(device, &flush_queue);
8f61701b 1974 return rc;
1da177e4 1975}
7048a2b5 1976EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
1da177e4
LT		 1977
1978/*
1979 * Acquire the device lock and process queues for the device.
1980 */
8e09f215 1981static void dasd_device_tasklet(struct dasd_device *device)
1da177e4
LT		 1982{
1983 struct list_head final_queue;
1da177e4
LT		 1984
1985 atomic_set (&device->tasklet_scheduled, 0);
1986 INIT_LIST_HEAD(&final_queue);
1987 spin_lock_irq(get_ccwdev_lock(device->cdev));
1988 /* Check expire time of first request on the ccw queue. */
8e09f215
SW		 1989 __dasd_device_check_expire(device);
1990 /* find final requests on ccw queue */
1991 __dasd_device_process_ccw_queue(device, &final_queue);
a4d26c6a 1992 __dasd_device_check_path_events(device);
1da177e4
LT		 1993 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1994 /* Now call the callback function of requests with final status */
8e09f215
SW		 1995 __dasd_device_process_final_queue(device, &final_queue);
1996 spin_lock_irq(get_ccwdev_lock(device->cdev));
1da177e4 1997 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 1998 __dasd_device_start_head(device);
1999 spin_unlock_irq(get_ccwdev_lock(device->cdev));
4679e893
SH		 2000 if (waitqueue_active(&shutdown_waitq))
2001 wake_up(&shutdown_waitq);
1da177e4
LT		 2002 dasd_put_device(device);
2003}
2004
2005/*
2006 * Schedules a call to dasd_tasklet over the device tasklet.
2007 */
8e09f215 2008void dasd_schedule_device_bh(struct dasd_device *device)
1da177e4
LT		 2009{
2010 /* Protect against rescheduling. */
973bd993 2011 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1da177e4
LT		 2012 return;
2013 dasd_get_device(device);
2014 tasklet_hi_schedule(&device->tasklet);
2015}
7048a2b5 2016EXPORT_SYMBOL(dasd_schedule_device_bh);
1da177e4 2017
eb6e199b
SW		 2018void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2019{
2020 device->stopped |= bits;
2021}
2022EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2023
2024void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2025{
2026 device->stopped &= ~bits;
2027 if (!device->stopped)
2028 wake_up(&generic_waitq);
2029}
2030EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2031
1da177e4 2032/*
8e09f215
SW		 2033 * Queue a request to the head of the device ccw_queue.
2034 * Start the I/O if possible.
1da177e4 2035 */
8e09f215 2036void dasd_add_request_head(struct dasd_ccw_req *cqr)
1da177e4
LT		 2037{
2038 struct dasd_device *device;
2039 unsigned long flags;
2040
8e09f215 2041 device = cqr->startdev;
1da177e4 2042 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 2043 cqr->status = DASD_CQR_QUEUED;
2044 list_add(&cqr->devlist, &device->ccw_queue);
1da177e4 2045 /* let the bh start the request to keep them in order */
8e09f215 2046 dasd_schedule_device_bh(device);
1da177e4
LT		 2047 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2048}
7048a2b5 2049EXPORT_SYMBOL(dasd_add_request_head);
1da177e4
LT		 2050
2051/*
8e09f215
SW		 2052 * Queue a request to the tail of the device ccw_queue.
2053 * Start the I/O if possible.
1da177e4 2054 */
8e09f215 2055void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1da177e4
LT		 2056{
2057 struct dasd_device *device;
2058 unsigned long flags;
2059
8e09f215 2060 device = cqr->startdev;
1da177e4 2061 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 2062 cqr->status = DASD_CQR_QUEUED;
2063 list_add_tail(&cqr->devlist, &device->ccw_queue);
1da177e4 2064 /* let the bh start the request to keep them in order */
8e09f215 2065 dasd_schedule_device_bh(device);
1da177e4
LT		 2066 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2067}
7048a2b5 2068EXPORT_SYMBOL(dasd_add_request_tail);
1da177e4
LT		 2069
2070/*
8e09f215 2071 * Wakeup helper for the 'sleep_on' functions.
1da177e4 2072 */
5915a873 2073void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1da177e4 2074{
1c1e093c
SW		 2075 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2076 cqr->callback_data = DASD_SLEEPON_END_TAG;
2077 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2078 wake_up(&generic_waitq);
1da177e4 2079}
5915a873 2080EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
1da177e4 2081
8e09f215 2082static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1da177e4
LT		 2083{
2084 struct dasd_device *device;
2085 int rc;
2086
8e09f215 2087 device = cqr->startdev;
1da177e4 2088 spin_lock_irq(get_ccwdev_lock(device->cdev));
1c1e093c 2089 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
1da177e4
LT		 2090 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2091 return rc;
2092}
2093
2094/*
eb6e199b 2095 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1da177e4 2096 */
eb6e199b 2097static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1da177e4 2098{
1da177e4 2099 struct dasd_device *device;
eb6e199b 2100 dasd_erp_fn_t erp_fn;
138c014d 2101
eb6e199b
SW		 2102 if (cqr->status == DASD_CQR_FILLED)
2103 return 0;
8e09f215 2104 device = cqr->startdev;
eb6e199b
SW		 2105 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2106 if (cqr->status == DASD_CQR_TERMINATED) {
2107 device->discipline->handle_terminated_request(cqr);
2108 return 1;
2109 }
2110 if (cqr->status == DASD_CQR_NEED_ERP) {
2111 erp_fn = device->discipline->erp_action(cqr);
2112 erp_fn(cqr);
2113 return 1;
2114 }
2115 if (cqr->status == DASD_CQR_FAILED)
2116 dasd_log_sense(cqr, &cqr->irb);
2117 if (cqr->refers) {
2118 __dasd_process_erp(device, cqr);
2119 return 1;
2120 }
2121 }
2122 return 0;
2123}
138c014d 2124
eb6e199b
SW		 2125static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2126{
2127 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2128 if (cqr->refers) /* erp is not done yet */
2129 return 1;
2130 return ((cqr->status != DASD_CQR_DONE) &&
2131 (cqr->status != DASD_CQR_FAILED));
2132 } else
2133 return (cqr->status == DASD_CQR_FILLED);
2134}
138c014d 2135
eb6e199b
SW		 2136static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2137{
2138 struct dasd_device *device;
2139 int rc;
2140 struct list_head ccw_queue;
2141 struct dasd_ccw_req *cqr;
2142
2143 INIT_LIST_HEAD(&ccw_queue);
2144 maincqr->status = DASD_CQR_FILLED;
2145 device = maincqr->startdev;
2146 list_add(&maincqr->blocklist, &ccw_queue);
2147 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2148 cqr = list_first_entry(&ccw_queue,
2149 struct dasd_ccw_req, blocklist)) {
2150
2151 if (__dasd_sleep_on_erp(cqr))
2152 continue;
2153 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2154 continue;
5a27e60d
SW		 2155 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2156 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2157 cqr->status = DASD_CQR_FAILED;
2158 cqr->intrc = -EPERM;
2159 continue;
2160 }
eb6e199b
SW		 2161 /* Non-temporary stop condition will trigger fail fast */
2162 if (device->stopped & ~DASD_STOPPED_PENDING &&
2163 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2164 (!dasd_eer_enabled(device))) {
2165 cqr->status = DASD_CQR_FAILED;
d1ffc1f8 2166 cqr->intrc = -ENOLINK;
eb6e199b
SW		 2167 continue;
2168 }
eb6e199b
SW		 2169 /* Don't try to start requests if device is stopped */
2170 if (interruptible) {
2171 rc = wait_event_interruptible(
2172 generic_waitq, !(device->stopped));
2173 if (rc == -ERESTARTSYS) {
2174 cqr->status = DASD_CQR_FAILED;
2175 maincqr->intrc = rc;
2176 continue;
2177 }
2178 } else
2179 wait_event(generic_waitq, !(device->stopped));
2180
5915a873
SH		 2181 if (!cqr->callback)
2182 cqr->callback = dasd_wakeup_cb;
2183
1c1e093c 2184 cqr->callback_data = DASD_SLEEPON_START_TAG;
eb6e199b
SW		 2185 dasd_add_request_tail(cqr);
2186 if (interruptible) {
2187 rc = wait_event_interruptible(
2188 generic_waitq, _wait_for_wakeup(cqr));
2189 if (rc == -ERESTARTSYS) {
2190 dasd_cancel_req(cqr);
2191 /* wait (non-interruptible) for final status */
2192 wait_event(generic_waitq,
2193 _wait_for_wakeup(cqr));
2194 cqr->status = DASD_CQR_FAILED;
2195 maincqr->intrc = rc;
2196 continue;
2197 }
2198 } else
2199 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2200 }
2201
1aae0560 2202 maincqr->endclk = get_tod_clock();
eb6e199b
SW		 2203 if ((maincqr->status != DASD_CQR_DONE) &&
2204 (maincqr->intrc != -ERESTARTSYS))
2205 dasd_log_sense(maincqr, &maincqr->irb);
2206 if (maincqr->status == DASD_CQR_DONE)
6cc7f168 2207 rc = 0;
eb6e199b
SW		 2208 else if (maincqr->intrc)
2209 rc = maincqr->intrc;
6cc7f168
SW		 2210 else
2211 rc = -EIO;
1da177e4
LT		 2212 return rc;
2213}
2214
d42e1712
SH		 2215static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2216{
2217 struct dasd_ccw_req *cqr;
2218
2219 list_for_each_entry(cqr, ccw_queue, blocklist) {
2220 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2221 return 0;
2222 }
2223
2224 return 1;
2225}
2226
2227static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2228{
2229 struct dasd_device *device;
d42e1712 2230 struct dasd_ccw_req *cqr, *n;
362ce84f 2231 int rc;
d42e1712
SH		 2232
2233retry:
2234 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2235 device = cqr->startdev;
2236 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2237 continue;
2238
2239 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2240 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2241 cqr->status = DASD_CQR_FAILED;
2242 cqr->intrc = -EPERM;
2243 continue;
2244 }
2245 /*Non-temporary stop condition will trigger fail fast*/
2246 if (device->stopped & ~DASD_STOPPED_PENDING &&
2247 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2248 !dasd_eer_enabled(device)) {
2249 cqr->status = DASD_CQR_FAILED;
2250 cqr->intrc = -EAGAIN;
2251 continue;
2252 }
2253
2254 /*Don't try to start requests if device is stopped*/
2255 if (interruptible) {
2256 rc = wait_event_interruptible(
2257 generic_waitq, !device->stopped);
2258 if (rc == -ERESTARTSYS) {
2259 cqr->status = DASD_CQR_FAILED;
2260 cqr->intrc = rc;
2261 continue;
2262 }
2263 } else
2264 wait_event(generic_waitq, !(device->stopped));
2265
2266 if (!cqr->callback)
2267 cqr->callback = dasd_wakeup_cb;
2268 cqr->callback_data = DASD_SLEEPON_START_TAG;
2269 dasd_add_request_tail(cqr);
2270 }
2271
2272 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2273
2274 rc = 0;
2275 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
29b8dd9d
SH		 2276 /*
2277 * for alias devices simplify error recovery and
2278 * return to upper layer
362ce84f 2279 * do not skip ERP requests
29b8dd9d 2280 */
362ce84f 2281 if (cqr->startdev != cqr->basedev && !cqr->refers &&
29b8dd9d
SH		 2282 (cqr->status == DASD_CQR_TERMINATED ||
2283 cqr->status == DASD_CQR_NEED_ERP))
2284 return -EAGAIN;
362ce84f
SH		 2285
2286 /* normal recovery for basedev IO */
590aeedd
SH		 2287 if (__dasd_sleep_on_erp(cqr))
2288 /* handle erp first */
362ce84f 2289 goto retry;
d42e1712 2290 }
362ce84f 2291
d42e1712
SH		 2292 return 0;
2293}
2294
eb6e199b
SW		 2295/*
2296 * Queue a request to the tail of the device ccw_queue and wait for
2297 * it's completion.
2298 */
2299int dasd_sleep_on(struct dasd_ccw_req *cqr)
2300{
2301 return _dasd_sleep_on(cqr, 0);
2302}
7048a2b5 2303EXPORT_SYMBOL(dasd_sleep_on);
eb6e199b 2304
d42e1712
SH		 2305/*
2306 * Start requests from a ccw_queue and wait for their completion.
2307 */
2308int dasd_sleep_on_queue(struct list_head *ccw_queue)
2309{
2310 return _dasd_sleep_on_queue(ccw_queue, 0);
2311}
2312EXPORT_SYMBOL(dasd_sleep_on_queue);
2313
1da177e4 2314/*
8e09f215
SW		 2315 * Queue a request to the tail of the device ccw_queue and wait
2316 * interruptible for it's completion.
1da177e4 2317 */
8e09f215 2318int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1da177e4 2319{
eb6e199b 2320 return _dasd_sleep_on(cqr, 1);
1da177e4 2321}
7048a2b5 2322EXPORT_SYMBOL(dasd_sleep_on_interruptible);
1da177e4
LT		 2323
2324/*
2325 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2326 * for eckd devices) the currently running request has to be terminated
2327 * and be put back to status queued, before the special request is added
2328 * to the head of the queue. Then the special request is waited on normally.
2329 */
8e09f215 2330static inline int _dasd_term_running_cqr(struct dasd_device *device)
1da177e4
LT		 2331{
2332 struct dasd_ccw_req *cqr;
aade6c0d 2333 int rc;
1da177e4
LT		 2334
2335 if (list_empty(&device->ccw_queue))
2336 return 0;
8e09f215 2337 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
aade6c0d
SH		 2338 rc = device->discipline->term_IO(cqr);
2339 if (!rc)
2340 /*
2341 * CQR terminated because a more important request is pending.
2342 * Undo decreasing of retry counter because this is
2343 * not an error case.
2344 */
2345 cqr->retries++;
2346 return rc;
1da177e4
LT		 2347}
2348
8e09f215 2349int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1da177e4 2350{
1da177e4
LT		 2351 struct dasd_device *device;
2352 int rc;
138c014d 2353
8e09f215 2354 device = cqr->startdev;
5a27e60d
SW		 2355 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2356 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2357 cqr->status = DASD_CQR_FAILED;
2358 cqr->intrc = -EPERM;
2359 return -EIO;
2360 }
1da177e4
LT		 2361 spin_lock_irq(get_ccwdev_lock(device->cdev));
2362 rc = _dasd_term_running_cqr(device);
2363 if (rc) {
2364 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2365 return rc;
2366 }
1da177e4 2367 cqr->callback = dasd_wakeup_cb;
1c1e093c 2368 cqr->callback_data = DASD_SLEEPON_START_TAG;
1da177e4 2369 cqr->status = DASD_CQR_QUEUED;
214b8ffc
SH		 2370 /*
2371 * add new request as second
2372 * first the terminated cqr needs to be finished
2373 */
2374 list_add(&cqr->devlist, device->ccw_queue.next);
138c014d 2375
1da177e4 2376 /* let the bh start the request to keep them in order */
8e09f215 2377 dasd_schedule_device_bh(device);
138c014d 2378
1da177e4
LT		 2379 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2380
c80ee724 2381 wait_event(generic_waitq, _wait_for_wakeup(cqr));
138c014d 2382
6cc7f168
SW		 2383 if (cqr->status == DASD_CQR_DONE)
2384 rc = 0;
2385 else if (cqr->intrc)
2386 rc = cqr->intrc;
2387 else
2388 rc = -EIO;
0e003b70
SH		 2389
2390 /* kick tasklets */
2391 dasd_schedule_device_bh(device);
2392 if (device->block)
2393 dasd_schedule_block_bh(device->block);
2394
1da177e4
LT		 2395 return rc;
2396}
7048a2b5 2397EXPORT_SYMBOL(dasd_sleep_on_immediatly);
1da177e4
LT		 2398
2399/*
2400 * Cancels a request that was started with dasd_sleep_on_req.
2401 * This is useful to timeout requests. The request will be
2402 * terminated if it is currently in i/o.
b99a946d 2403 * Returns 0 if request termination was successful
8e09f215
SW		 2404 * negative error code if termination failed
2405 * Cancellation of a request is an asynchronous operation! The calling
2406 * function has to wait until the request is properly returned via callback.
1da177e4 2407 */
8e09f215 2408int dasd_cancel_req(struct dasd_ccw_req *cqr)
1da177e4 2409{
8e09f215 2410 struct dasd_device *device = cqr->startdev;
1da177e4
LT		 2411 unsigned long flags;
2412 int rc;
2413
2414 rc = 0;
2415 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2416 switch (cqr->status) {
2417 case DASD_CQR_QUEUED:
8e09f215
SW		 2418 /* request was not started - just set to cleared */
2419 cqr->status = DASD_CQR_CLEARED;
931a3dce
SH		 2420 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2421 cqr->callback_data = DASD_SLEEPON_END_TAG;
1da177e4
LT		 2422 break;
2423 case DASD_CQR_IN_IO:
2424 /* request in IO - terminate IO and release again */
8e09f215
SW		 2425 rc = device->discipline->term_IO(cqr);
2426 if (rc) {
fc19f381
SH		 2427 dev_err(&device->cdev->dev,
2428 "Cancelling request %p failed with rc=%d\n",
2429 cqr, rc);
8e09f215 2430 } else {
1aae0560 2431 cqr->stopclk = get_tod_clock();
8e09f215 2432 }
1da177e4 2433 break;
8e09f215 2434 default: /* already finished or clear pending - do nothing */
1da177e4 2435 break;
8e09f215
SW		 2436 }
2437 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2438 dasd_schedule_device_bh(device);
2439 return rc;
2440}
7048a2b5 2441EXPORT_SYMBOL(dasd_cancel_req);
8e09f215 2442
8e09f215
SW		 2443/*
2444 * SECTION: Operations of the dasd_block layer.
2445 */
2446
2447/*
2448 * Timeout function for dasd_block. This is used when the block layer
2449 * is waiting for something that may not come reliably, (e.g. a state
2450 * change interrupt)
2451 */
2452static void dasd_block_timeout(unsigned long ptr)
2453{
2454 unsigned long flags;
2455 struct dasd_block *block;
2456
2457 block = (struct dasd_block *) ptr;
2458 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2459 /* re-activate request queue */
eb6e199b 2460 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
8e09f215
SW		 2461 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2462 dasd_schedule_block_bh(block);
2463}
2464
2465/*
2466 * Setup timeout for a dasd_block in jiffies.
2467 */
2468void dasd_block_set_timer(struct dasd_block *block, int expires)
2469{
48cae885
SW		 2470 if (expires == 0)
2471 del_timer(&block->timer);
2472 else
2473 mod_timer(&block->timer, jiffies + expires);
8e09f215 2474}
7048a2b5 2475EXPORT_SYMBOL(dasd_block_set_timer);
8e09f215
SW		 2476
2477/*
2478 * Clear timeout for a dasd_block.
2479 */
2480void dasd_block_clear_timer(struct dasd_block *block)
2481{
48cae885 2482 del_timer(&block->timer);
8e09f215 2483}
7048a2b5 2484EXPORT_SYMBOL(dasd_block_clear_timer);
8e09f215 2485
8e09f215
SW		 2486/*
2487 * Process finished error recovery ccw.
2488 */
eb6e199b
SW		 2489static void __dasd_process_erp(struct dasd_device *device,
2490 struct dasd_ccw_req *cqr)
8e09f215
SW		 2491{
2492 dasd_erp_fn_t erp_fn;
8e09f215
SW		 2493
2494 if (cqr->status == DASD_CQR_DONE)
2495 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2496 else
fc19f381 2497 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
8e09f215
SW		 2498 erp_fn = device->discipline->erp_postaction(cqr);
2499 erp_fn(cqr);
2500}
1da177e4 2501
8e09f215
SW		 2502/*
2503 * Fetch requests from the block device queue.
2504 */
2505static void __dasd_process_request_queue(struct dasd_block *block)
2506{
2507 struct request_queue *queue;
2508 struct request *req;
2509 struct dasd_ccw_req *cqr;
2510 struct dasd_device *basedev;
2511 unsigned long flags;
2512 queue = block->request_queue;
2513 basedev = block->base;
2514 /* No queue ? Then there is nothing to do. */
2515 if (queue == NULL)
2516 return;
2517
2518 /*
2519 * We requeue request from the block device queue to the ccw
2520 * queue only in two states. In state DASD_STATE_READY the
2521 * partition detection is done and we need to requeue requests
2522 * for that. State DASD_STATE_ONLINE is normal block device
2523 * operation.
2524 */
97f604b0
SW		 2525 if (basedev->state < DASD_STATE_READY) {
2526 while ((req = blk_fetch_request(block->request_queue)))
2527 __blk_end_request_all(req, -EIO);
8e09f215 2528 return;
97f604b0 2529 }
a3147a7b
SH		 2530
2531 /* if device ist stopped do not fetch new requests */
2532 if (basedev->stopped)
2533 return;
2534
8e09f215 2535 /* Now we try to fetch requests from the request queue */
7eaceacc 2536 while ((req = blk_peek_request(queue))) {
8e09f215
SW		 2537 if (basedev->features & DASD_FEATURE_READONLY &&
2538 rq_data_dir(req) == WRITE) {
2539 DBF_DEV_EVENT(DBF_ERR, basedev,
2540 "Rejecting write request %p",
2541 req);
9934c8c0 2542 blk_start_request(req);
40cbbb78 2543 __blk_end_request_all(req, -EIO);
8e09f215
SW		 2544 continue;
2545 }
5ea34a01
HR		 2546 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
2547 (basedev->features & DASD_FEATURE_FAILFAST ||
2548 blk_noretry_request(req))) {
2549 DBF_DEV_EVENT(DBF_ERR, basedev,
2550 "Rejecting failfast request %p",
2551 req);
2552 blk_start_request(req);
2553 __blk_end_request_all(req, -ETIMEDOUT);
2554 continue;
2555 }
8e09f215
SW		 2556 cqr = basedev->discipline->build_cp(basedev, block, req);
2557 if (IS_ERR(cqr)) {
2558 if (PTR_ERR(cqr) == -EBUSY)
2559 break; /* normal end condition */
2560 if (PTR_ERR(cqr) == -ENOMEM)
2561 break; /* terminate request queue loop */
2562 if (PTR_ERR(cqr) == -EAGAIN) {
2563 /*
2564 * The current request cannot be build right
2565 * now, we have to try later. If this request
2566 * is the head-of-queue we stop the device
2567 * for 1/2 second.
2568 */
2569 if (!list_empty(&block->ccw_queue))
2570 break;
eb6e199b
SW		 2571 spin_lock_irqsave(
2572 get_ccwdev_lock(basedev->cdev), flags);
2573 dasd_device_set_stop_bits(basedev,
2574 DASD_STOPPED_PENDING);
2575 spin_unlock_irqrestore(
2576 get_ccwdev_lock(basedev->cdev), flags);
8e09f215
SW		 2577 dasd_block_set_timer(block, HZ/2);
2578 break;
2579 }
2580 DBF_DEV_EVENT(DBF_ERR, basedev,
2581 "CCW creation failed (rc=%ld) "
2582 "on request %p",
2583 PTR_ERR(cqr), req);
9934c8c0 2584 blk_start_request(req);
40cbbb78 2585 __blk_end_request_all(req, -EIO);
8e09f215
SW		 2586 continue;
2587 }
2588 /*
2589 * Note: callback is set to dasd_return_cqr_cb in
2590 * __dasd_block_start_head to cover erp requests as well
2591 */
2592 cqr->callback_data = (void *) req;
2593 cqr->status = DASD_CQR_FILLED;
a2ace466 2594 req->completion_data = cqr;
9934c8c0 2595 blk_start_request(req);
8e09f215 2596 list_add_tail(&cqr->blocklist, &block->ccw_queue);
a2ace466 2597 INIT_LIST_HEAD(&cqr->devlist);
8e09f215
SW		 2598 dasd_profile_start(block, cqr, req);
2599 }
2600}
2601
2602static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2603{
2604 struct request *req;
2605 int status;
4c4e2148 2606 int error = 0;
8e09f215
SW		 2607
2608 req = (struct request *) cqr->callback_data;
2609 dasd_profile_end(cqr->block, cqr, req);
fe6b8e76 2610 status = cqr->block->base->discipline->free_cp(cqr, req);
d1ffc1f8
HR		 2611 if (status < 0)
2612 error = status;
2613 else if (status == 0) {
2614 if (cqr->intrc == -EPERM)
2615 error = -EBADE;
2616 else if (cqr->intrc == -ENOLINK ||
2617 cqr->intrc == -ETIMEDOUT)
2618 error = cqr->intrc;
2619 else
2620 error = -EIO;
2621 }
40cbbb78 2622 __blk_end_request_all(req, error);
8e09f215
SW		 2623}
2624
2625/*
2626 * Process ccw request queue.
2627 */
2628static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2629 struct list_head *final_queue)
2630{
2631 struct list_head *l, *n;
2632 struct dasd_ccw_req *cqr;
2633 dasd_erp_fn_t erp_fn;
2634 unsigned long flags;
2635 struct dasd_device *base = block->base;
2636
2637restart:
2638 /* Process request with final status. */
2639 list_for_each_safe(l, n, &block->ccw_queue) {
2640 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2641 if (cqr->status != DASD_CQR_DONE &&
2642 cqr->status != DASD_CQR_FAILED &&
2643 cqr->status != DASD_CQR_NEED_ERP &&
2644 cqr->status != DASD_CQR_TERMINATED)
2645 continue;
2646
2647 if (cqr->status == DASD_CQR_TERMINATED) {
2648 base->discipline->handle_terminated_request(cqr);
2649 goto restart;
2650 }
2651
2652 /* Process requests that may be recovered */
2653 if (cqr->status == DASD_CQR_NEED_ERP) {
6c5f57c7 2654 erp_fn = base->discipline->erp_action(cqr);
6a5176c4
SH		 2655 if (IS_ERR(erp_fn(cqr)))
2656 continue;
8e09f215
SW		 2657 goto restart;
2658 }
2659
a9cffb22
SH		 2660 /* log sense for fatal error */
2661 if (cqr->status == DASD_CQR_FAILED) {
2662 dasd_log_sense(cqr, &cqr->irb);
2663 }
2664
8e09f215
SW		 2665 /* First of all call extended error reporting. */
2666 if (dasd_eer_enabled(base) &&
2667 cqr->status == DASD_CQR_FAILED) {
2668 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2669
2670 /* restart request */
2671 cqr->status = DASD_CQR_FILLED;
2672 cqr->retries = 255;
2673 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
eb6e199b 2674 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
8e09f215
SW		 2675 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2676 flags);
2677 goto restart;
2678 }
2679
2680 /* Process finished ERP request. */
2681 if (cqr->refers) {
eb6e199b 2682 __dasd_process_erp(base, cqr);
8e09f215
SW		 2683 goto restart;
2684 }
2685
2686 /* Rechain finished requests to final queue */
1aae0560 2687 cqr->endclk = get_tod_clock();
8e09f215
SW		 2688 list_move_tail(&cqr->blocklist, final_queue);
2689 }
2690}
2691
2692static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2693{
2694 dasd_schedule_block_bh(cqr->block);
2695}
2696
2697static void __dasd_block_start_head(struct dasd_block *block)
2698{
2699 struct dasd_ccw_req *cqr;
2700
2701 if (list_empty(&block->ccw_queue))
2702 return;
2703 /* We allways begin with the first requests on the queue, as some
2704 * of previously started requests have to be enqueued on a
2705 * dasd_device again for error recovery.
2706 */
2707 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2708 if (cqr->status != DASD_CQR_FILLED)
2709 continue;
5a27e60d
SW		 2710 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2711 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2712 cqr->status = DASD_CQR_FAILED;
2713 cqr->intrc = -EPERM;
2714 dasd_schedule_block_bh(block);
2715 continue;
2716 }
8e09f215
SW		 2717 /* Non-temporary stop condition will trigger fail fast */
2718 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2719 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2720 (!dasd_eer_enabled(block->base))) {
2721 cqr->status = DASD_CQR_FAILED;
d1ffc1f8 2722 cqr->intrc = -ENOLINK;
8e09f215
SW		 2723 dasd_schedule_block_bh(block);
2724 continue;
2725 }
2726 /* Don't try to start requests if device is stopped */
2727 if (block->base->stopped)
2728 return;
2729
2730 /* just a fail safe check, should not happen */
2731 if (!cqr->startdev)
2732 cqr->startdev = block->base;
2733
2734 /* make sure that the requests we submit find their way back */
2735 cqr->callback = dasd_return_cqr_cb;
2736
2737 dasd_add_request_tail(cqr);
2738 }
2739}
2740
2741/*
2742 * Central dasd_block layer routine. Takes requests from the generic
2743 * block layer request queue, creates ccw requests, enqueues them on
2744 * a dasd_device and processes ccw requests that have been returned.
2745 */
2746static void dasd_block_tasklet(struct dasd_block *block)
2747{
2748 struct list_head final_queue;
2749 struct list_head *l, *n;
2750 struct dasd_ccw_req *cqr;
2751
2752 atomic_set(&block->tasklet_scheduled, 0);
2753 INIT_LIST_HEAD(&final_queue);
2754 spin_lock(&block->queue_lock);
2755 /* Finish off requests on ccw queue */
2756 __dasd_process_block_ccw_queue(block, &final_queue);
2757 spin_unlock(&block->queue_lock);
2758 /* Now call the callback function of requests with final status */
2759 spin_lock_irq(&block->request_queue_lock);
2760 list_for_each_safe(l, n, &final_queue) {
2761 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2762 list_del_init(&cqr->blocklist);
2763 __dasd_cleanup_cqr(cqr);
2764 }
2765 spin_lock(&block->queue_lock);
2766 /* Get new request from the block device request queue */
2767 __dasd_process_request_queue(block);
2768 /* Now check if the head of the ccw queue needs to be started. */
2769 __dasd_block_start_head(block);
2770 spin_unlock(&block->queue_lock);
2771 spin_unlock_irq(&block->request_queue_lock);
4679e893
SH		 2772 if (waitqueue_active(&shutdown_waitq))
2773 wake_up(&shutdown_waitq);
8e09f215
SW		 2774 dasd_put_device(block->base);
2775}
2776
2777static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2778{
2779 wake_up(&dasd_flush_wq);
2780}
2781
c5576876
SH		 2782/*
2783 * Requeue a request back to the block request queue
2784 * only works for block requests
2785 */
2786static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2787{
2788 struct dasd_block *block = cqr->block;
2789 struct request *req;
2790 unsigned long flags;
2791
2792 if (!block)
2793 return -EINVAL;
2794 spin_lock_irqsave(&block->queue_lock, flags);
2795 req = (struct request *) cqr->callback_data;
2796 blk_requeue_request(block->request_queue, req);
2797 spin_unlock_irqrestore(&block->queue_lock, flags);
2798
2799 return 0;
2800}
2801
8e09f215
SW		 2802/*
2803 * Go through all request on the dasd_block request queue, cancel them
2804 * on the respective dasd_device, and return them to the generic
2805 * block layer.
2806 */
2807static int dasd_flush_block_queue(struct dasd_block *block)
2808{
2809 struct dasd_ccw_req *cqr, *n;
2810 int rc, i;
2811 struct list_head flush_queue;
2812
2813 INIT_LIST_HEAD(&flush_queue);
2814 spin_lock_bh(&block->queue_lock);
2815 rc = 0;
2816restart:
2817 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2818 /* if this request currently owned by a dasd_device cancel it */
2819 if (cqr->status >= DASD_CQR_QUEUED)
2820 rc = dasd_cancel_req(cqr);
2821 if (rc < 0)
2822 break;
2823 /* Rechain request (including erp chain) so it won't be
2824 * touched by the dasd_block_tasklet anymore.
2825 * Replace the callback so we notice when the request
2826 * is returned from the dasd_device layer.
2827 */
2828 cqr->callback = _dasd_wake_block_flush_cb;
2829 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2830 list_move_tail(&cqr->blocklist, &flush_queue);
2831 if (i > 1)
2832 /* moved more than one request - need to restart */
2833 goto restart;
2834 }
2835 spin_unlock_bh(&block->queue_lock);
2836 /* Now call the callback function of flushed requests */
2837restart_cb:
2838 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2839 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2840 /* Process finished ERP request. */
2841 if (cqr->refers) {
0cd4bd47 2842 spin_lock_bh(&block->queue_lock);
eb6e199b 2843 __dasd_process_erp(block->base, cqr);
0cd4bd47 2844 spin_unlock_bh(&block->queue_lock);
8e09f215
SW		 2845 /* restart list_for_xx loop since dasd_process_erp
2846 * might remove multiple elements */
2847 goto restart_cb;
2848 }
2849 /* call the callback function */
0cd4bd47 2850 spin_lock_irq(&block->request_queue_lock);
1aae0560 2851 cqr->endclk = get_tod_clock();
8e09f215
SW		 2852 list_del_init(&cqr->blocklist);
2853 __dasd_cleanup_cqr(cqr);
0cd4bd47 2854 spin_unlock_irq(&block->request_queue_lock);
1da177e4 2855 }
1da177e4
LT		 2856 return rc;
2857}
2858
2859/*
8e09f215
SW		 2860 * Schedules a call to dasd_tasklet over the device tasklet.
2861 */
2862void dasd_schedule_block_bh(struct dasd_block *block)
2863{
2864 /* Protect against rescheduling. */
2865 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2866 return;
2867 /* life cycle of block is bound to it's base device */
2868 dasd_get_device(block->base);
2869 tasklet_hi_schedule(&block->tasklet);
2870}
7048a2b5 2871EXPORT_SYMBOL(dasd_schedule_block_bh);
8e09f215
SW		 2872
2873
2874/*
2875 * SECTION: external block device operations
2876 * (request queue handling, open, release, etc.)
1da177e4
LT		 2877 */
2878
2879/*
2880 * Dasd request queue function. Called from ll_rw_blk.c
2881 */
8e09f215 2882static void do_dasd_request(struct request_queue *queue)
1da177e4 2883{
8e09f215 2884 struct dasd_block *block;
1da177e4 2885
8e09f215
SW		 2886 block = queue->queuedata;
2887 spin_lock(&block->queue_lock);
1da177e4 2888 /* Get new request from the block device request queue */
8e09f215 2889 __dasd_process_request_queue(block);
1da177e4 2890 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 2891 __dasd_block_start_head(block);
2892 spin_unlock(&block->queue_lock);
1da177e4
LT		 2893}
2894
a2ace466
HR		 2895/*
2896 * Block timeout callback, called from the block layer
2897 *
2898 * request_queue lock is held on entry.
2899 *
2900 * Return values:
2901 * BLK_EH_RESET_TIMER if the request should be left running
2902 * BLK_EH_NOT_HANDLED if the request is handled or terminated
2903 * by the driver.
2904 */
2905enum blk_eh_timer_return dasd_times_out(struct request *req)
2906{
2907 struct dasd_ccw_req *cqr = req->completion_data;
2908 struct dasd_block *block = req->q->queuedata;
2909 struct dasd_device *device;
2910 int rc = 0;
2911
2912 if (!cqr)
2913 return BLK_EH_NOT_HANDLED;
2914
2915 device = cqr->startdev ? cqr->startdev : block->base;
3d71ad32
HR		 2916 if (!device->blk_timeout)
2917 return BLK_EH_RESET_TIMER;
a2ace466
HR		 2918 DBF_DEV_EVENT(DBF_WARNING, device,
2919 " dasd_times_out cqr %p status %x",
2920 cqr, cqr->status);
2921
2922 spin_lock(&block->queue_lock);
2923 spin_lock(get_ccwdev_lock(device->cdev));
2924 cqr->retries = -1;
2925 cqr->intrc = -ETIMEDOUT;
2926 if (cqr->status >= DASD_CQR_QUEUED) {
2927 spin_unlock(get_ccwdev_lock(device->cdev));
2928 rc = dasd_cancel_req(cqr);
2929 } else if (cqr->status == DASD_CQR_FILLED ||
2930 cqr->status == DASD_CQR_NEED_ERP) {
2931 cqr->status = DASD_CQR_TERMINATED;
2932 spin_unlock(get_ccwdev_lock(device->cdev));
2933 } else if (cqr->status == DASD_CQR_IN_ERP) {
2934 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
2935
2936 list_for_each_entry_safe(searchcqr, nextcqr,
2937 &block->ccw_queue, blocklist) {
2938 tmpcqr = searchcqr;
2939 while (tmpcqr->refers)
2940 tmpcqr = tmpcqr->refers;
2941 if (tmpcqr != cqr)
2942 continue;
2943 /* searchcqr is an ERP request for cqr */
2944 searchcqr->retries = -1;
2945 searchcqr->intrc = -ETIMEDOUT;
2946 if (searchcqr->status >= DASD_CQR_QUEUED) {
2947 spin_unlock(get_ccwdev_lock(device->cdev));
2948 rc = dasd_cancel_req(searchcqr);
2949 spin_lock(get_ccwdev_lock(device->cdev));
2950 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
2951 (searchcqr->status == DASD_CQR_NEED_ERP)) {
2952 searchcqr->status = DASD_CQR_TERMINATED;
2953 rc = 0;
2954 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
2955 /*
2956 * Shouldn't happen; most recent ERP
2957 * request is at the front of queue
2958 */
2959 continue;
2960 }
2961 break;
2962 }
2963 spin_unlock(get_ccwdev_lock(device->cdev));
2964 }
2965 dasd_schedule_block_bh(block);
2966 spin_unlock(&block->queue_lock);
2967
2968 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
2969}
2970
1da177e4
LT		 2971/*
2972 * Allocate and initialize request queue and default I/O scheduler.
2973 */
8e09f215 2974static int dasd_alloc_queue(struct dasd_block *block)
1da177e4 2975{
8e09f215
SW		 2976 block->request_queue = blk_init_queue(do_dasd_request,
2977 &block->request_queue_lock);
2978 if (block->request_queue == NULL)
1da177e4
LT		 2979 return -ENOMEM;
2980
8e09f215 2981 block->request_queue->queuedata = block;
1da177e4 2982
a5fd8ddc 2983 return 0;
1da177e4
LT		 2984}
2985
2986/*
2987 * Allocate and initialize request queue.
2988 */
8e09f215 2989static void dasd_setup_queue(struct dasd_block *block)
1da177e4
LT		 2990{
2991 int max;
2992
e4dbb0f2
SH		 2993 if (block->base->features & DASD_FEATURE_USERAW) {
2994 /*
2995 * the max_blocks value for raw_track access is 256
2996 * it is higher than the native ECKD value because we
2997 * only need one ccw per track
2998 * so the max_hw_sectors are
2999 * 2048 x 512B = 1024kB = 16 tracks
3000 */
3001 max = 2048;
3002 } else {
3003 max = block->base->discipline->max_blocks << block->s2b_shift;
3004 }
3005 blk_queue_logical_block_size(block->request_queue,
3006 block->bp_block);
086fa5ff 3007 blk_queue_max_hw_sectors(block->request_queue, max);
8a78362c 3008 blk_queue_max_segments(block->request_queue, -1L);
f3eb5384
SW		 3009 /* with page sized segments we can translate each segement into
3010 * one idaw/tidaw
3011 */
3012 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
3013 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
1da177e4
LT		 3014}
3015
3016/*
3017 * Deactivate and free request queue.
3018 */
8e09f215 3019static void dasd_free_queue(struct dasd_block *block)
1da177e4 3020{
8e09f215
SW		 3021 if (block->request_queue) {
3022 blk_cleanup_queue(block->request_queue);
3023 block->request_queue = NULL;
1da177e4
LT		 3024 }
3025}
3026
3027/*
3028 * Flush request on the request queue.
3029 */
8e09f215 3030static void dasd_flush_request_queue(struct dasd_block *block)
1da177e4
LT		 3031{
3032 struct request *req;
3033
8e09f215 3034 if (!block->request_queue)
1da177e4 3035 return;
138c014d 3036
8e09f215 3037 spin_lock_irq(&block->request_queue_lock);
9934c8c0 3038 while ((req = blk_fetch_request(block->request_queue)))
40cbbb78 3039 __blk_end_request_all(req, -EIO);
8e09f215 3040 spin_unlock_irq(&block->request_queue_lock);
1da177e4
LT		 3041}
3042
57a7c0bc 3043static int dasd_open(struct block_device *bdev, fmode_t mode)
1da177e4 3044{
9eb25122 3045 struct dasd_device *base;
1da177e4
LT		 3046 int rc;
3047
65f8da47
SW		 3048 base = dasd_device_from_gendisk(bdev->bd_disk);
3049 if (!base)
9eb25122
SH		 3050 return -ENODEV;
3051
65f8da47 3052 atomic_inc(&base->block->open_count);
8e09f215 3053 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
1da177e4
LT		 3054 rc = -ENODEV;
3055 goto unlock;
3056 }
3057
8e09f215 3058 if (!try_module_get(base->discipline->owner)) {
1da177e4
LT		 3059 rc = -EINVAL;
3060 goto unlock;
3061 }
3062
3063 if (dasd_probeonly) {
fc19f381
SH		 3064 dev_info(&base->cdev->dev,
3065 "Accessing the DASD failed because it is in "
3066 "probeonly mode\n");
1da177e4
LT		 3067 rc = -EPERM;
3068 goto out;
3069 }
3070
8e09f215
SW		 3071 if (base->state <= DASD_STATE_BASIC) {
3072 DBF_DEV_EVENT(DBF_ERR, base, " %s",
1da177e4
LT		 3073 " Cannot open unrecognized device");
3074 rc = -ENODEV;
3075 goto out;
3076 }
3077
33b62a30
SW		 3078 if ((mode & FMODE_WRITE) &&
3079 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3080 (base->features & DASD_FEATURE_READONLY))) {
3081 rc = -EROFS;
3082 goto out;
3083 }
3084
65f8da47 3085 dasd_put_device(base);
1da177e4
LT		 3086 return 0;
3087
3088out:
8e09f215 3089 module_put(base->discipline->owner);
1da177e4 3090unlock:
65f8da47
SW		 3091 atomic_dec(&base->block->open_count);
3092 dasd_put_device(base);
1da177e4
LT		 3093 return rc;
3094}
3095
db2a144b 3096static void dasd_release(struct gendisk *disk, fmode_t mode)
1da177e4 3097{
db2a144b
AV		 3098 struct dasd_device *base = dasd_device_from_gendisk(disk);
3099 if (base) {
3100 atomic_dec(&base->block->open_count);
3101 module_put(base->discipline->owner);
3102 dasd_put_device(base);
3103 }
1da177e4
LT		 3104}
3105
a885c8c4
CH		 3106/*
3107 * Return disk geometry.
3108 */
8e09f215 3109static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
a885c8c4 3110{
8e09f215 3111 struct dasd_device *base;
a885c8c4 3112
65f8da47
SW		 3113 base = dasd_device_from_gendisk(bdev->bd_disk);
3114 if (!base)
a885c8c4
CH		 3115 return -ENODEV;
3116
8e09f215 3117 if (!base->discipline ||
65f8da47
SW		 3118 !base->discipline->fill_geometry) {
3119 dasd_put_device(base);
a885c8c4 3120 return -EINVAL;
65f8da47
SW		 3121 }
3122 base->discipline->fill_geometry(base->block, geo);
3123 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3124 dasd_put_device(base);
a885c8c4
CH		 3125 return 0;
3126}
3127
83d5cde4 3128const struct block_device_operations
1da177e4
LT		 3129dasd_device_operations = {
3130 .owner = THIS_MODULE,
57a7c0bc
AV		 3131 .open = dasd_open,
3132 .release = dasd_release,
0000d031
HC		 3133 .ioctl = dasd_ioctl,
3134 .compat_ioctl = dasd_ioctl,
a885c8c4 3135 .getgeo = dasd_getgeo,
1da177e4
LT		 3136};
3137
8e09f215
SW		 3138/*******************************************************************************
3139 * end of block device operations
3140 */
1da177e4
LT		 3141
3142static void
3143dasd_exit(void)
3144{
3145#ifdef CONFIG_PROC_FS
3146 dasd_proc_exit();
3147#endif
20c64468 3148 dasd_eer_exit();
6bb0e010
HH		 3149 if (dasd_page_cache != NULL) {
3150 kmem_cache_destroy(dasd_page_cache);
3151 dasd_page_cache = NULL;
3152 }
1da177e4
LT		 3153 dasd_gendisk_exit();
3154 dasd_devmap_exit();
1da177e4
LT		 3155 if (dasd_debug_area != NULL) {
3156 debug_unregister(dasd_debug_area);
3157 dasd_debug_area = NULL;
3158 }
4fa52aa7 3159 dasd_statistics_removeroot();
1da177e4
LT		 3160}
3161
3162/*
3163 * SECTION: common functions for ccw_driver use
3164 */
3165
33b62a30
SW		 3166/*
3167 * Is the device read-only?
3168 * Note that this function does not report the setting of the
3169 * readonly device attribute, but how it is configured in z/VM.
3170 */
3171int dasd_device_is_ro(struct dasd_device *device)
3172{
3173 struct ccw_dev_id dev_id;
3174 struct diag210 diag_data;
3175 int rc;
3176
3177 if (!MACHINE_IS_VM)
3178 return 0;
3179 ccw_device_get_id(device->cdev, &dev_id);
3180 memset(&diag_data, 0, sizeof(diag_data));
3181 diag_data.vrdcdvno = dev_id.devno;
3182 diag_data.vrdclen = sizeof(diag_data);
3183 rc = diag210(&diag_data);
3184 if (rc == 0 || rc == 2) {
3185 return diag_data.vrdcvfla & 0x80;
3186 } else {
3187 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3188 dev_id.devno, rc);
3189 return 0;
3190 }
3191}
3192EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3193
f3445a1a
CH		 3194static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3195{
3196 struct ccw_device *cdev = data;
3197 int ret;
3198
3199 ret = ccw_device_set_online(cdev);
3200 if (ret)
4ce25966
FF		 3201 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3202 dev_name(&cdev->dev), ret);
f3445a1a
CH		 3203}
3204
1c01b8a5
HH		 3205/*
3206 * Initial attempt at a probe function. this can be simplified once
3207 * the other detection code is gone.
3208 */
8e09f215
SW		 3209int dasd_generic_probe(struct ccw_device *cdev,
3210 struct dasd_discipline *discipline)
1da177e4
LT		 3211{
3212 int ret;
3213
3214 ret = dasd_add_sysfs_files(cdev);
3215 if (ret) {
b8ed5dd5
SH		 3216 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3217 "dasd_generic_probe: could not add "
3218 "sysfs entries");
40545573 3219 return ret;
1da177e4 3220 }
40545573 3221 cdev->handler = &dasd_int_handler;
1da177e4 3222
40545573
HH		 3223 /*
3224 * Automatically online either all dasd devices (dasd_autodetect)
3225 * or all devices specified with dasd= parameters during
3226 * initial probe.
3227 */
3228 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2a0217d5 3229 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
f3445a1a 3230 async_schedule(dasd_generic_auto_online, cdev);
de3e0da1 3231 return 0;
1da177e4 3232}
7048a2b5 3233EXPORT_SYMBOL_GPL(dasd_generic_probe);
1da177e4 3234
1c01b8a5
HH		 3235/*
3236 * This will one day be called from a global not_oper handler.
3237 * It is also used by driver_unregister during module unload.
3238 */
8e09f215 3239void dasd_generic_remove(struct ccw_device *cdev)
1da177e4
LT		 3240{
3241 struct dasd_device *device;
8e09f215 3242 struct dasd_block *block;
1da177e4 3243
59afda78
HH		 3244 cdev->handler = NULL;
3245
1da177e4 3246 device = dasd_device_from_cdev(cdev);
be4904e5
SW		 3247 if (IS_ERR(device)) {
3248 dasd_remove_sysfs_files(cdev);
1da177e4 3249 return;
be4904e5 3250 }
d07dc5d8
SH		 3251 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3252 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1da177e4
LT		 3253 /* Already doing offline processing */
3254 dasd_put_device(device);
be4904e5 3255 dasd_remove_sysfs_files(cdev);
1da177e4
LT		 3256 return;
3257 }
3258 /*
3259 * This device is removed unconditionally. Set offline
3260 * flag to prevent dasd_open from opening it while it is
3261 * no quite down yet.
3262 */
3263 dasd_set_target_state(device, DASD_STATE_NEW);
3264 /* dasd_delete_device destroys the device reference. */
8e09f215 3265 block = device->block;
1da177e4 3266 dasd_delete_device(device);
8e09f215
SW		 3267 /*
3268 * life cycle of block is bound to device, so delete it after
3269 * device was safely removed
3270 */
3271 if (block)
3272 dasd_free_block(block);
d07dc5d8
SH		 3273
3274 dasd_remove_sysfs_files(cdev);
1da177e4 3275}
7048a2b5 3276EXPORT_SYMBOL_GPL(dasd_generic_remove);
1da177e4 3277
1c01b8a5
HH		 3278/*
3279 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1da177e4 3280 * the device is detected for the first time and is supposed to be used
1c01b8a5
HH		 3281 * or the user has started activation through sysfs.
3282 */
8e09f215
SW		 3283int dasd_generic_set_online(struct ccw_device *cdev,
3284 struct dasd_discipline *base_discipline)
1da177e4 3285{
aa88861f 3286 struct dasd_discipline *discipline;
1da177e4 3287 struct dasd_device *device;
c6eb7b77 3288 int rc;
f24acd45 3289
40545573
HH		 3290 /* first online clears initial online feature flag */
3291 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
1da177e4
LT		 3292 device = dasd_create_device(cdev);
3293 if (IS_ERR(device))
3294 return PTR_ERR(device);
3295
aa88861f 3296 discipline = base_discipline;
c6eb7b77 3297 if (device->features & DASD_FEATURE_USEDIAG) {
1da177e4 3298 if (!dasd_diag_discipline_pointer) {
4ce25966
FF		 3299 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3300 dev_name(&cdev->dev));
1da177e4
LT		 3301 dasd_delete_device(device);
3302 return -ENODEV;
3303 }
3304 discipline = dasd_diag_discipline_pointer;
3305 }
aa88861f
PO		 3306 if (!try_module_get(base_discipline->owner)) {
3307 dasd_delete_device(device);
3308 return -EINVAL;
3309 }
3310 if (!try_module_get(discipline->owner)) {
3311 module_put(base_discipline->owner);
3312 dasd_delete_device(device);
3313 return -EINVAL;
3314 }
3315 device->base_discipline = base_discipline;
1da177e4
LT		 3316 device->discipline = discipline;
3317
8e09f215 3318 /* check_device will allocate block device if necessary */
1da177e4
LT		 3319 rc = discipline->check_device(device);
3320 if (rc) {
4ce25966
FF		 3321 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3322 dev_name(&cdev->dev), discipline->name, rc);
aa88861f
PO		 3323 module_put(discipline->owner);
3324 module_put(base_discipline->owner);
1da177e4
LT		 3325 dasd_delete_device(device);
3326 return rc;
3327 }
3328
3329 dasd_set_target_state(device, DASD_STATE_ONLINE);
3330 if (device->state <= DASD_STATE_KNOWN) {
4ce25966
FF		 3331 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3332 dev_name(&cdev->dev));
1da177e4
LT		 3333 rc = -ENODEV;
3334 dasd_set_target_state(device, DASD_STATE_NEW);
8e09f215
SW		 3335 if (device->block)
3336 dasd_free_block(device->block);
1da177e4
LT		 3337 dasd_delete_device(device);
3338 } else
3339 pr_debug("dasd_generic device %s found\n",
2a0217d5 3340 dev_name(&cdev->dev));
589c74d5
SH		 3341
3342 wait_event(dasd_init_waitq, _wait_for_device(device));
3343
1da177e4 3344 dasd_put_device(device);
1da177e4
LT		 3345 return rc;
3346}
7048a2b5 3347EXPORT_SYMBOL_GPL(dasd_generic_set_online);
1da177e4 3348
8e09f215 3349int dasd_generic_set_offline(struct ccw_device *cdev)
1da177e4
LT		 3350{
3351 struct dasd_device *device;
8e09f215 3352 struct dasd_block *block;
d07dc5d8 3353 int max_count, open_count, rc;
1da177e4 3354
d07dc5d8 3355 rc = 0;
1da177e4
LT		 3356 device = dasd_device_from_cdev(cdev);
3357 if (IS_ERR(device))
3358 return PTR_ERR(device);
d07dc5d8 3359
1da177e4
LT		 3360 /*
3361 * We must make sure that this device is currently not in use.
3362 * The open_count is increased for every opener, that includes
3363 * the blkdev_get in dasd_scan_partitions. We are only interested
3364 * in the other openers.
3365 */
8e09f215 3366 if (device->block) {
a806170e
HC		 3367 max_count = device->block->bdev ? 0 : -1;
3368 open_count = atomic_read(&device->block->open_count);
8e09f215
SW		 3369 if (open_count > max_count) {
3370 if (open_count > 0)
4ce25966
FF		 3371 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3372 dev_name(&cdev->dev), open_count);
8e09f215 3373 else
4ce25966
FF		 3374 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3375 dev_name(&cdev->dev));
8e09f215
SW		 3376 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3377 dasd_put_device(device);
3378 return -EBUSY;
3379 }
1da177e4 3380 }
d07dc5d8
SH		 3381
3382 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3383 /*
b4a96015 3384 * safe offline already running
d07dc5d8
SH		 3385 * could only be called by normal offline so safe_offline flag
3386 * needs to be removed to run normal offline and kill all I/O
3387 */
3388 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3389 /* Already doing normal offline processing */
3390 dasd_put_device(device);
3391 return -EBUSY;
3392 } else
3393 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3394
3395 } else
3396 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3397 /* Already doing offline processing */
3398 dasd_put_device(device);
3399 return -EBUSY;
3400 }
3401
3402 /*
3403 * if safe_offline called set safe_offline_running flag and
3404 * clear safe_offline so that a call to normal offline
3405 * can overrun safe_offline processing
3406 */
3407 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3408 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3409 /*
3410 * If we want to set the device safe offline all IO operations
3411 * should be finished before continuing the offline process
3412 * so sync bdev first and then wait for our queues to become
3413 * empty
3414 */
3415 /* sync blockdev and partitions */
3416 rc = fsync_bdev(device->block->bdev);
3417 if (rc != 0)
3418 goto interrupted;
3419
3420 /* schedule device tasklet and wait for completion */
3421 dasd_schedule_device_bh(device);
3422 rc = wait_event_interruptible(shutdown_waitq,
3423 _wait_for_empty_queues(device));
3424 if (rc != 0)
3425 goto interrupted;
3426 }
3427
3428 set_bit(DASD_FLAG_OFFLINE, &device->flags);
1da177e4
LT		 3429 dasd_set_target_state(device, DASD_STATE_NEW);
3430 /* dasd_delete_device destroys the device reference. */
8e09f215 3431 block = device->block;
1da177e4 3432 dasd_delete_device(device);
8e09f215
SW		 3433 /*
3434 * life cycle of block is bound to device, so delete it after
3435 * device was safely removed
3436 */
3437 if (block)
3438 dasd_free_block(block);
1da177e4 3439 return 0;
d07dc5d8
SH		 3440
3441interrupted:
3442 /* interrupted by signal */
3443 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3444 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3445 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3446 dasd_put_device(device);
3447 return rc;
1da177e4 3448}
7048a2b5 3449EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
1da177e4 3450
a4d26c6a
SW		 3451int dasd_generic_last_path_gone(struct dasd_device *device)
3452{
3453 struct dasd_ccw_req *cqr;
3454
3455 dev_warn(&device->cdev->dev, "No operational channel path is left "
3456 "for the device\n");
3457 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3458 /* First of all call extended error reporting. */
3459 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3460
3461 if (device->state < DASD_STATE_BASIC)
3462 return 0;
3463 /* Device is active. We want to keep it. */
3464 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3465 if ((cqr->status == DASD_CQR_IN_IO) ||
3466 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3467 cqr->status = DASD_CQR_QUEUED;
3468 cqr->retries++;
3469 }
3470 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3471 dasd_device_clear_timer(device);
3472 dasd_schedule_device_bh(device);
3473 return 1;
3474}
3475EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3476
3477int dasd_generic_path_operational(struct dasd_device *device)
3478{
3479 dev_info(&device->cdev->dev, "A channel path to the device has become "
3480 "operational\n");
3481 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3482 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3483 if (device->stopped & DASD_UNRESUMED_PM) {
3484 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3485 dasd_restore_device(device);
3486 return 1;
3487 }
3488 dasd_schedule_device_bh(device);
3489 if (device->block)
3490 dasd_schedule_block_bh(device->block);
931a3dce
SH		 3491
3492 if (!device->stopped)
3493 wake_up(&generic_waitq);
3494
a4d26c6a
SW		 3495 return 1;
3496}
3497EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3498
8e09f215 3499int dasd_generic_notify(struct ccw_device *cdev, int event)
1da177e4
LT		 3500{
3501 struct dasd_device *device;
1da177e4
LT		 3502 int ret;
3503
91c36919 3504 device = dasd_device_from_cdev_locked(cdev);
1da177e4
LT		 3505 if (IS_ERR(device))
3506 return 0;
1da177e4
LT		 3507 ret = 0;
3508 switch (event) {
3509 case CIO_GONE:
47593bfa 3510 case CIO_BOXED:
1da177e4 3511 case CIO_NO_PATH:
a4d26c6a
SW		 3512 device->path_data.opm = 0;
3513 device->path_data.ppm = 0;
3514 device->path_data.npm = 0;
3515 ret = dasd_generic_last_path_gone(device);
1da177e4
LT		 3516 break;
3517 case CIO_OPER:
1da177e4 3518 ret = 1;
a4d26c6a
SW		 3519 if (device->path_data.opm)
3520 ret = dasd_generic_path_operational(device);
1da177e4
LT		 3521 break;
3522 }
1da177e4
LT		 3523 dasd_put_device(device);
3524 return ret;
3525}
7048a2b5 3526EXPORT_SYMBOL_GPL(dasd_generic_notify);
1da177e4 3527
a4d26c6a
SW		 3528void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3529{
3530 int chp;
3531 __u8 oldopm, eventlpm;
3532 struct dasd_device *device;
3533
3534 device = dasd_device_from_cdev_locked(cdev);
3535 if (IS_ERR(device))
3536 return;
3537 for (chp = 0; chp < 8; chp++) {
3538 eventlpm = 0x80 >> chp;
3539 if (path_event[chp] & PE_PATH_GONE) {
3540 oldopm = device->path_data.opm;
3541 device->path_data.opm &= ~eventlpm;
3542 device->path_data.ppm &= ~eventlpm;
3543 device->path_data.npm &= ~eventlpm;
8b811bae
SW		 3544 if (oldopm && !device->path_data.opm) {
3545 dev_warn(&device->cdev->dev,
3546 "No verified channel paths remain "
3547 "for the device\n");
3548 DBF_DEV_EVENT(DBF_WARNING, device,
3549 "%s", "last verified path gone");
3550 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3551 dasd_device_set_stop_bits(device,
3552 DASD_STOPPED_DC_WAIT);
3553 }
a4d26c6a
SW		 3554 }
3555 if (path_event[chp] & PE_PATH_AVAILABLE) {
3556 device->path_data.opm &= ~eventlpm;
3557 device->path_data.ppm &= ~eventlpm;
3558 device->path_data.npm &= ~eventlpm;
3559 device->path_data.tbvpm |= eventlpm;
3560 dasd_schedule_device_bh(device);
3561 }
f1633031 3562 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
12d7b107
SH		 3563 if (!(device->path_data.opm & eventlpm) &&
3564 !(device->path_data.tbvpm & eventlpm)) {
3565 /*
3566 * we can not establish a pathgroup on an
3567 * unavailable path, so trigger a path
3568 * verification first
3569 */
3570 device->path_data.tbvpm |= eventlpm;
3571 dasd_schedule_device_bh(device);
3572 }
f1633031
SH		 3573 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3574 "Pathgroup re-established\n");
3575 if (device->discipline->kick_validate)
3576 device->discipline->kick_validate(device);
3577 }
a4d26c6a
SW		 3578 }
3579 dasd_put_device(device);
3580}
3581EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3582
3583int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3584{
3585 if (!device->path_data.opm && lpm) {
3586 device->path_data.opm = lpm;
3587 dasd_generic_path_operational(device);
3588 } else
3589 device->path_data.opm |= lpm;
3590 return 0;
3591}
3592EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3593
3594
d41dd122
SH		 3595int dasd_generic_pm_freeze(struct ccw_device *cdev)
3596{
c5576876
SH		 3597 struct dasd_device *device = dasd_device_from_cdev(cdev);
3598 struct list_head freeze_queue;
d41dd122 3599 struct dasd_ccw_req *cqr, *n;
c5576876 3600 struct dasd_ccw_req *refers;
d41dd122 3601 int rc;
d41dd122
SH		 3602
3603 if (IS_ERR(device))
3604 return PTR_ERR(device);
6f272b9c 3605
c8d1c0ff
SH		 3606 /* mark device as suspended */
3607 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3608
6f272b9c
SH		 3609 if (device->discipline->freeze)
3610 rc = device->discipline->freeze(device);
3611
d41dd122 3612 /* disallow new I/O */
eb6e199b 3613 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
c5576876
SH		 3614
3615 /* clear active requests and requeue them to block layer if possible */
d41dd122
SH		 3616 INIT_LIST_HEAD(&freeze_queue);
3617 spin_lock_irq(get_ccwdev_lock(cdev));
3618 rc = 0;
3619 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3620 /* Check status and move request to flush_queue */
3621 if (cqr->status == DASD_CQR_IN_IO) {
3622 rc = device->discipline->term_IO(cqr);
3623 if (rc) {
3624 /* unable to terminate requeust */
3625 dev_err(&device->cdev->dev,
3626 "Unable to terminate request %p "
3627 "on suspend\n", cqr);
3628 spin_unlock_irq(get_ccwdev_lock(cdev));
3629 dasd_put_device(device);
3630 return rc;
3631 }
3632 }
3633 list_move_tail(&cqr->devlist, &freeze_queue);
3634 }
d41dd122
SH		 3635 spin_unlock_irq(get_ccwdev_lock(cdev));
3636
3637 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3638 wait_event(dasd_flush_wq,
3639 (cqr->status != DASD_CQR_CLEAR_PENDING));
3640 if (cqr->status == DASD_CQR_CLEARED)
3641 cqr->status = DASD_CQR_QUEUED;
c5576876
SH		 3642
3643 /* requeue requests to blocklayer will only work for
3644 block device requests */
3645 if (_dasd_requeue_request(cqr))
3646 continue;
3647
3648 /* remove requests from device and block queue */
3649 list_del_init(&cqr->devlist);
3650 while (cqr->refers != NULL) {
3651 refers = cqr->refers;
3652 /* remove the request from the block queue */
3653 list_del(&cqr->blocklist);
3654 /* free the finished erp request */
3655 dasd_free_erp_request(cqr, cqr->memdev);
3656 cqr = refers;
3657 }
3658 if (cqr->block)
3659 list_del_init(&cqr->blocklist);
3660 cqr->block->base->discipline->free_cp(
3661 cqr, (struct request *) cqr->callback_data);
d41dd122 3662 }
d41dd122 3663
c5576876
SH		 3664 /*
3665 * if requests remain then they are internal request
3666 * and go back to the device queue
3667 */
3668 if (!list_empty(&freeze_queue)) {
3669 /* move freeze_queue to start of the ccw_queue */
3670 spin_lock_irq(get_ccwdev_lock(cdev));
3671 list_splice_tail(&freeze_queue, &device->ccw_queue);
3672 spin_unlock_irq(get_ccwdev_lock(cdev));
3673 }
d41dd122
SH		 3674 dasd_put_device(device);
3675 return rc;
3676}
3677EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3678
3679int dasd_generic_restore_device(struct ccw_device *cdev)
3680{
3681 struct dasd_device *device = dasd_device_from_cdev(cdev);
3682 int rc = 0;
3683
3684 if (IS_ERR(device))
3685 return PTR_ERR(device);
3686
e6125fba 3687 /* allow new IO again */
eb6e199b
SW		 3688 dasd_device_remove_stop_bits(device,
3689 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
e6125fba 3690
d41dd122 3691 dasd_schedule_device_bh(device);
d41dd122 3692
eb6e199b
SW		 3693 /*
3694 * call discipline restore function
3695 * if device is stopped do nothing e.g. for disconnected devices
3696 */
3697 if (device->discipline->restore && !(device->stopped))
d41dd122 3698 rc = device->discipline->restore(device);
eb6e199b 3699 if (rc || device->stopped)
e6125fba
SH		 3700 /*
3701 * if the resume failed for the DASD we put it in
3702 * an UNRESUMED stop state
3703 */
3704 device->stopped |= DASD_UNRESUMED_PM;
d41dd122 3705
6fca97a9
SH		 3706 if (device->block)
3707 dasd_schedule_block_bh(device->block);
3708
c8d1c0ff 3709 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
d41dd122 3710 dasd_put_device(device);
e6125fba 3711 return 0;
d41dd122
SH		 3712}
3713EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3714
763968e2
HC		 3715static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3716 void *rdc_buffer,
3717 int rdc_buffer_size,
68b781fe 3718 int magic)
17283b56
CH		 3719{
3720 struct dasd_ccw_req *cqr;
3721 struct ccw1 *ccw;
d9fa9441 3722 unsigned long *idaw;
17283b56
CH		 3723
3724 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3725
3726 if (IS_ERR(cqr)) {
fc19f381
SH		 3727 /* internal error 13 - Allocating the RDC request failed*/
3728 dev_err(&device->cdev->dev,
3729 "An error occurred in the DASD device driver, "
3730 "reason=%s\n", "13");
17283b56
CH		 3731 return cqr;
3732 }
3733
3734 ccw = cqr->cpaddr;
3735 ccw->cmd_code = CCW_CMD_RDC;
d9fa9441
SH		 3736 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3737 idaw = (unsigned long *) (cqr->data);
3738 ccw->cda = (__u32)(addr_t) idaw;
3739 ccw->flags = CCW_FLAG_IDA;
3740 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3741 } else {
3742 ccw->cda = (__u32)(addr_t) rdc_buffer;
3743 ccw->flags = 0;
3744 }
17283b56 3745
d9fa9441 3746 ccw->count = rdc_buffer_size;
8e09f215
SW		 3747 cqr->startdev = device;
3748 cqr->memdev = device;
17283b56 3749 cqr->expires = 10*HZ;
eb6e199b 3750 cqr->retries = 256;
1aae0560 3751 cqr->buildclk = get_tod_clock();
17283b56
CH		 3752 cqr->status = DASD_CQR_FILLED;
3753 return cqr;
3754}
3755
3756
68b781fe 3757int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
92636b15 3758 void *rdc_buffer, int rdc_buffer_size)
17283b56
CH		 3759{
3760 int ret;
3761 struct dasd_ccw_req *cqr;
3762
92636b15 3763 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
17283b56
CH		 3764 magic);
3765 if (IS_ERR(cqr))
3766 return PTR_ERR(cqr);
3767
3768 ret = dasd_sleep_on(cqr);
8e09f215 3769 dasd_sfree_request(cqr, cqr->memdev);
17283b56
CH		 3770 return ret;
3771}
aaff0f64 3772EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
20c64468 3773
f3eb5384
SW		 3774/*
3775 * In command mode and transport mode we need to look for sense
3776 * data in different places. The sense data itself is allways
3777 * an array of 32 bytes, so we can unify the sense data access
3778 * for both modes.
3779 */
3780char *dasd_get_sense(struct irb *irb)
3781{
3782 struct tsb *tsb = NULL;
3783 char *sense = NULL;
3784
3785 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3786 if (irb->scsw.tm.tcw)
3787 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3788 irb->scsw.tm.tcw);
3789 if (tsb && tsb->length == 64 && tsb->flags)
3790 switch (tsb->flags & 0x07) {
3791 case 1: /* tsa_iostat */
3792 sense = tsb->tsa.iostat.sense;
3793 break;
3794 case 2: /* tsa_ddpc */
3795 sense = tsb->tsa.ddpc.sense;
3796 break;
3797 default:
3798 /* currently we don't use interrogate data */
3799 break;
3800 }
3801 } else if (irb->esw.esw0.erw.cons) {
3802 sense = irb->ecw;
3803 }
3804 return sense;
3805}
3806EXPORT_SYMBOL_GPL(dasd_get_sense);
3807
4679e893
SH		 3808void dasd_generic_shutdown(struct ccw_device *cdev)
3809{
3810 struct dasd_device *device;
3811
3812 device = dasd_device_from_cdev(cdev);
3813 if (IS_ERR(device))
3814 return;
3815
3816 if (device->block)
3817 dasd_schedule_block_bh(device->block);
3818
3819 dasd_schedule_device_bh(device);
3820
3821 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3822}
3823EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3824
8e09f215 3825static int __init dasd_init(void)
1da177e4
LT		 3826{
3827 int rc;
3828
3829 init_waitqueue_head(&dasd_init_waitq);
8f61701b 3830 init_waitqueue_head(&dasd_flush_wq);
c80ee724 3831 init_waitqueue_head(&generic_waitq);
4679e893 3832 init_waitqueue_head(&shutdown_waitq);
1da177e4
LT		 3833
3834 /* register 'common' DASD debug area, used for all DBF_XXX calls */
361f494d 3835 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
1da177e4
LT		 3836 if (dasd_debug_area == NULL) {
3837 rc = -ENOMEM;
3838 goto failed;
3839 }
3840 debug_register_view(dasd_debug_area, &debug_sprintf_view);
b0035f12 3841 debug_set_level(dasd_debug_area, DBF_WARNING);
1da177e4
LT		 3842
3843 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3844
3845 dasd_diag_discipline_pointer = NULL;
3846
4fa52aa7
SW		 3847 dasd_statistics_createroot();
3848
1da177e4
LT		 3849 rc = dasd_devmap_init();
3850 if (rc)
3851 goto failed;
3852 rc = dasd_gendisk_init();
3853 if (rc)
3854 goto failed;
3855 rc = dasd_parse();
3856 if (rc)
3857 goto failed;
20c64468
SW		 3858 rc = dasd_eer_init();
3859 if (rc)
3860 goto failed;
1da177e4
LT		 3861#ifdef CONFIG_PROC_FS
3862 rc = dasd_proc_init();
3863 if (rc)
3864 goto failed;
3865#endif
3866
3867 return 0;
3868failed:
fc19f381 3869 pr_info("The DASD device driver could not be initialized\n");
1da177e4
LT		 3870 dasd_exit();
3871 return rc;
3872}
3873
3874module_init(dasd_init);
3875module_exit(dasd_exit);
Linux kernel - Deliverables
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