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Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma
[GitHub/mt8127/android_kernel_alcatel_ttab.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
1c1e093c
SW		 41#define DASD_SLEEPON_START_TAG (void *) 1
42#define DASD_SLEEPON_END_TAG (void *) 2
43
1da177e4
LT		 44/*
45 * SECTION: exported variables of dasd.c
46 */
47debug_info_t *dasd_debug_area;
4fa52aa7 48static struct dentry *dasd_debugfs_root_entry;
1da177e4 49struct dasd_discipline *dasd_diag_discipline_pointer;
2b67fc46 50void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
1da177e4
LT		 51
52MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
53MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
a53c8fab 54 " Copyright IBM Corp. 2000");
1da177e4 55MODULE_SUPPORTED_DEVICE("dasd");
1da177e4
LT		 56MODULE_LICENSE("GPL");
57
58/*
59 * SECTION: prototypes for static functions of dasd.c
60 */
8e09f215
SW		 61static int dasd_alloc_queue(struct dasd_block *);
62static void dasd_setup_queue(struct dasd_block *);
63static void dasd_free_queue(struct dasd_block *);
64static void dasd_flush_request_queue(struct dasd_block *);
65static int dasd_flush_block_queue(struct dasd_block *);
66static void dasd_device_tasklet(struct dasd_device *);
67static void dasd_block_tasklet(struct dasd_block *);
4927b3f7 68static void do_kick_device(struct work_struct *);
d41dd122 69static void do_restore_device(struct work_struct *);
501183f2 70static void do_reload_device(struct work_struct *);
8e09f215 71static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
48cae885
SW		 72static void dasd_device_timeout(unsigned long);
73static void dasd_block_timeout(unsigned long);
eb6e199b 74static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
4fa52aa7
SW		 75static void dasd_profile_init(struct dasd_profile *, struct dentry *);
76static void dasd_profile_exit(struct dasd_profile *);
1da177e4
LT		 77
78/*
79 * SECTION: Operations on the device structure.
80 */
81static wait_queue_head_t dasd_init_waitq;
8f61701b 82static wait_queue_head_t dasd_flush_wq;
c80ee724 83static wait_queue_head_t generic_waitq;
4679e893 84static wait_queue_head_t shutdown_waitq;
1da177e4
LT		 85
86/*
87 * Allocate memory for a new device structure.
88 */
8e09f215 89struct dasd_device *dasd_alloc_device(void)
1da177e4
LT		 90{
91 struct dasd_device *device;
92
8e09f215
SW		 93 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
94 if (!device)
1da177e4 95 return ERR_PTR(-ENOMEM);
1da177e4
LT		 96
97 /* Get two pages for normal block device operations. */
98 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
8e09f215 99 if (!device->ccw_mem) {
1da177e4
LT		 100 kfree(device);
101 return ERR_PTR(-ENOMEM);
102 }
103 /* Get one page for error recovery. */
104 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
8e09f215 105 if (!device->erp_mem) {
1da177e4
LT		 106 free_pages((unsigned long) device->ccw_mem, 1);
107 kfree(device);
108 return ERR_PTR(-ENOMEM);
109 }
110
111 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
112 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
113 spin_lock_init(&device->mem_lock);
8e09f215 114 atomic_set(&device->tasklet_scheduled, 0);
138c014d 115 tasklet_init(&device->tasklet,
8e09f215 116 (void (*)(unsigned long)) dasd_device_tasklet,
1da177e4
LT		 117 (unsigned long) device);
118 INIT_LIST_HEAD(&device->ccw_queue);
119 init_timer(&device->timer);
48cae885
SW		 120 device->timer.function = dasd_device_timeout;
121 device->timer.data = (unsigned long) device;
4927b3f7 122 INIT_WORK(&device->kick_work, do_kick_device);
d41dd122 123 INIT_WORK(&device->restore_device, do_restore_device);
501183f2 124 INIT_WORK(&device->reload_device, do_reload_device);
1da177e4
LT		 125 device->state = DASD_STATE_NEW;
126 device->target = DASD_STATE_NEW;
9eb25122 127 mutex_init(&device->state_mutex);
4fa52aa7 128 spin_lock_init(&device->profile.lock);
1da177e4
LT		 129 return device;
130}
131
132/*
133 * Free memory of a device structure.
134 */
8e09f215 135void dasd_free_device(struct dasd_device *device)
1da177e4 136{
17fd682e 137 kfree(device->private);
1da177e4
LT		 138 free_page((unsigned long) device->erp_mem);
139 free_pages((unsigned long) device->ccw_mem, 1);
140 kfree(device);
141}
142
8e09f215
SW		 143/*
144 * Allocate memory for a new device structure.
145 */
146struct dasd_block *dasd_alloc_block(void)
147{
148 struct dasd_block *block;
149
150 block = kzalloc(sizeof(*block), GFP_ATOMIC);
151 if (!block)
152 return ERR_PTR(-ENOMEM);
153 /* open_count = 0 means device online but not in use */
154 atomic_set(&block->open_count, -1);
155
156 spin_lock_init(&block->request_queue_lock);
157 atomic_set(&block->tasklet_scheduled, 0);
158 tasklet_init(&block->tasklet,
159 (void (*)(unsigned long)) dasd_block_tasklet,
160 (unsigned long) block);
161 INIT_LIST_HEAD(&block->ccw_queue);
162 spin_lock_init(&block->queue_lock);
163 init_timer(&block->timer);
48cae885
SW		 164 block->timer.function = dasd_block_timeout;
165 block->timer.data = (unsigned long) block;
4fa52aa7 166 spin_lock_init(&block->profile.lock);
8e09f215
SW		 167
168 return block;
169}
170
171/*
172 * Free memory of a device structure.
173 */
174void dasd_free_block(struct dasd_block *block)
175{
176 kfree(block);
177}
178
1da177e4
LT		 179/*
180 * Make a new device known to the system.
181 */
8e09f215 182static int dasd_state_new_to_known(struct dasd_device *device)
1da177e4
LT		 183{
184 int rc;
185
186 /*
138c014d 187 * As long as the device is not in state DASD_STATE_NEW we want to
1da177e4
LT		 188 * keep the reference count > 0.
189 */
190 dasd_get_device(device);
191
8e09f215
SW		 192 if (device->block) {
193 rc = dasd_alloc_queue(device->block);
194 if (rc) {
195 dasd_put_device(device);
196 return rc;
197 }
1da177e4 198 }
1da177e4
LT		 199 device->state = DASD_STATE_KNOWN;
200 return 0;
201}
202
203/*
204 * Let the system forget about a device.
205 */
8e09f215 206static int dasd_state_known_to_new(struct dasd_device *device)
1da177e4 207{
20c64468
SW		 208 /* Disable extended error reporting for this device. */
209 dasd_eer_disable(device);
1da177e4 210 /* Forget the discipline information. */
8e09f215
SW		 211 if (device->discipline) {
212 if (device->discipline->uncheck_device)
213 device->discipline->uncheck_device(device);
aa88861f 214 module_put(device->discipline->owner);
8e09f215 215 }
1da177e4 216 device->discipline = NULL;
aa88861f
PO		 217 if (device->base_discipline)
218 module_put(device->base_discipline->owner);
219 device->base_discipline = NULL;
1da177e4
LT		 220 device->state = DASD_STATE_NEW;
221
8e09f215
SW		 222 if (device->block)
223 dasd_free_queue(device->block);
1da177e4
LT		 224
225 /* Give up reference we took in dasd_state_new_to_known. */
226 dasd_put_device(device);
8f61701b 227 return 0;
1da177e4
LT		 228}
229
4fa52aa7
SW		 230static struct dentry *dasd_debugfs_setup(const char *name,
231 struct dentry *base_dentry)
232{
233 struct dentry *pde;
234
235 if (!base_dentry)
236 return NULL;
237 pde = debugfs_create_dir(name, base_dentry);
238 if (!pde || IS_ERR(pde))
239 return NULL;
240 return pde;
241}
242
1da177e4
LT		 243/*
244 * Request the irq line for the device.
245 */
8e09f215 246static int dasd_state_known_to_basic(struct dasd_device *device)
1da177e4 247{
4fa52aa7 248 struct dasd_block *block = device->block;
d42e1712 249 int rc = 0;
1da177e4
LT		 250
251 /* Allocate and register gendisk structure. */
4fa52aa7
SW		 252 if (block) {
253 rc = dasd_gendisk_alloc(block);
8e09f215
SW		 254 if (rc)
255 return rc;
4fa52aa7
SW		 256 block->debugfs_dentry =
257 dasd_debugfs_setup(block->gdp->disk_name,
258 dasd_debugfs_root_entry);
259 dasd_profile_init(&block->profile, block->debugfs_dentry);
260 if (dasd_global_profile_level == DASD_PROFILE_ON)
261 dasd_profile_on(&device->block->profile);
262 }
263 device->debugfs_dentry =
264 dasd_debugfs_setup(dev_name(&device->cdev->dev),
265 dasd_debugfs_root_entry);
266 dasd_profile_init(&device->profile, device->debugfs_dentry);
267
1da177e4 268 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
fc19f381 269 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
8e09f215 270 8 * sizeof(long));
1da177e4 271 debug_register_view(device->debug_area, &debug_sprintf_view);
b0035f12 272 debug_set_level(device->debug_area, DBF_WARNING);
1da177e4
LT		 273 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
274
275 device->state = DASD_STATE_BASIC;
d42e1712
SH		 276
277 return rc;
1da177e4
LT		 278}
279
280/*
281 * Release the irq line for the device. Terminate any running i/o.
282 */
8e09f215 283static int dasd_state_basic_to_known(struct dasd_device *device)
1da177e4 284{
8f61701b 285 int rc;
d42e1712 286
8e09f215 287 if (device->block) {
4fa52aa7
SW		 288 dasd_profile_exit(&device->block->profile);
289 if (device->block->debugfs_dentry)
290 debugfs_remove(device->block->debugfs_dentry);
8e09f215
SW		 291 dasd_gendisk_free(device->block);
292 dasd_block_clear_timer(device->block);
293 }
294 rc = dasd_flush_device_queue(device);
8f61701b
HH		 295 if (rc)
296 return rc;
8e09f215 297 dasd_device_clear_timer(device);
4fa52aa7
SW		 298 dasd_profile_exit(&device->profile);
299 if (device->debugfs_dentry)
300 debugfs_remove(device->debugfs_dentry);
8f61701b 301
1da177e4
LT		 302 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
303 if (device->debug_area != NULL) {
304 debug_unregister(device->debug_area);
305 device->debug_area = NULL;
306 }
307 device->state = DASD_STATE_KNOWN;
8f61701b 308 return 0;
1da177e4
LT		 309}
310
311/*
312 * Do the initial analysis. The do_analysis function may return
313 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
314 * until the discipline decides to continue the startup sequence
315 * by calling the function dasd_change_state. The eckd disciplines
316 * uses this to start a ccw that detects the format. The completion
317 * interrupt for this detection ccw uses the kernel event daemon to
318 * trigger the call to dasd_change_state. All this is done in the
319 * discipline code, see dasd_eckd.c.
90f0094d
HH		 320 * After the analysis ccw is done (do_analysis returned 0) the block
321 * device is setup.
322 * In case the analysis returns an error, the device setup is stopped
323 * (a fake disk was already added to allow formatting).
1da177e4 324 */
8e09f215 325static int dasd_state_basic_to_ready(struct dasd_device *device)
1da177e4
LT		 326{
327 int rc;
8e09f215 328 struct dasd_block *block;
1da177e4
LT		 329
330 rc = 0;
8e09f215 331 block = device->block;
90f0094d 332 /* make disk known with correct capacity */
8e09f215
SW		 333 if (block) {
334 if (block->base->discipline->do_analysis != NULL)
335 rc = block->base->discipline->do_analysis(block);
336 if (rc) {
d42e1712 337 if (rc != -EAGAIN) {
8e09f215 338 device->state = DASD_STATE_UNFMT;
d42e1712
SH		 339 goto out;
340 }
8e09f215
SW		 341 return rc;
342 }
343 dasd_setup_queue(block);
344 set_capacity(block->gdp,
345 block->blocks << block->s2b_shift);
346 device->state = DASD_STATE_READY;
347 rc = dasd_scan_partitions(block);
d42e1712 348 if (rc) {
8e09f215 349 device->state = DASD_STATE_BASIC;
d42e1712
SH		 350 return rc;
351 }
8e09f215
SW		 352 } else {
353 device->state = DASD_STATE_READY;
354 }
d42e1712
SH		 355out:
356 if (device->discipline->basic_to_ready)
357 rc = device->discipline->basic_to_ready(device);
90f0094d 358 return rc;
1da177e4
LT		 359}
360
d07dc5d8
SH		 361static inline
362int _wait_for_empty_queues(struct dasd_device *device)
363{
364 if (device->block)
365 return list_empty(&device->ccw_queue) &&
366 list_empty(&device->block->ccw_queue);
367 else
368 return list_empty(&device->ccw_queue);
369}
370
1da177e4
LT		 371/*
372 * Remove device from block device layer. Destroy dirty buffers.
373 * Forget format information. Check if the target level is basic
374 * and if it is create fake disk for formatting.
375 */
8e09f215 376static int dasd_state_ready_to_basic(struct dasd_device *device)
1da177e4 377{
8f61701b
HH		 378 int rc;
379
d42e1712
SH		 380 if (device->discipline->ready_to_basic) {
381 rc = device->discipline->ready_to_basic(device);
382 if (rc)
383 return rc;
384 }
1da177e4 385 device->state = DASD_STATE_BASIC;
8e09f215
SW		 386 if (device->block) {
387 struct dasd_block *block = device->block;
388 rc = dasd_flush_block_queue(block);
389 if (rc) {
390 device->state = DASD_STATE_READY;
391 return rc;
392 }
8e09f215 393 dasd_flush_request_queue(block);
b695adfa 394 dasd_destroy_partitions(block);
8e09f215
SW		 395 block->blocks = 0;
396 block->bp_block = 0;
397 block->s2b_shift = 0;
398 }
8f61701b 399 return 0;
1da177e4
LT		 400}
401
90f0094d
HH		 402/*
403 * Back to basic.
404 */
8e09f215 405static int dasd_state_unfmt_to_basic(struct dasd_device *device)
90f0094d
HH		 406{
407 device->state = DASD_STATE_BASIC;
8f61701b 408 return 0;
90f0094d
HH		 409}
410
1da177e4
LT		 411/*
412 * Make the device online and schedule the bottom half to start
413 * the requeueing of requests from the linux request queue to the
414 * ccw queue.
415 */
8f61701b 416static int
1da177e4
LT		 417dasd_state_ready_to_online(struct dasd_device * device)
418{
1301809b
SW		 419 struct gendisk *disk;
420 struct disk_part_iter piter;
421 struct hd_struct *part;
8e09f215 422
1da177e4 423 device->state = DASD_STATE_ONLINE;
1301809b 424 if (device->block) {
8e09f215 425 dasd_schedule_block_bh(device->block);
e4dbb0f2
SH		 426 if ((device->features & DASD_FEATURE_USERAW)) {
427 disk = device->block->gdp;
428 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
429 return 0;
430 }
1301809b
SW		 431 disk = device->block->bdev->bd_disk;
432 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
433 while ((part = disk_part_iter_next(&piter)))
434 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
435 disk_part_iter_exit(&piter);
436 }
1da177e4
LT		 437 return 0;
438}
439
440/*
441 * Stop the requeueing of requests again.
442 */
8e09f215 443static int dasd_state_online_to_ready(struct dasd_device *device)
1da177e4 444{
8e09f215 445 int rc;
1301809b
SW		 446 struct gendisk *disk;
447 struct disk_part_iter piter;
448 struct hd_struct *part;
8e09f215
SW		 449
450 if (device->discipline->online_to_ready) {
451 rc = device->discipline->online_to_ready(device);
452 if (rc)
453 return rc;
454 }
d42e1712 455
1da177e4 456 device->state = DASD_STATE_READY;
e4dbb0f2 457 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
1301809b
SW		 458 disk = device->block->bdev->bd_disk;
459 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
460 while ((part = disk_part_iter_next(&piter)))
461 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
462 disk_part_iter_exit(&piter);
463 }
8f61701b 464 return 0;
1da177e4
LT		 465}
466
467/*
468 * Device startup state changes.
469 */
8e09f215 470static int dasd_increase_state(struct dasd_device *device)
1da177e4
LT		 471{
472 int rc;
473
474 rc = 0;
475 if (device->state == DASD_STATE_NEW &&
476 device->target >= DASD_STATE_KNOWN)
477 rc = dasd_state_new_to_known(device);
478
479 if (!rc &&
480 device->state == DASD_STATE_KNOWN &&
481 device->target >= DASD_STATE_BASIC)
482 rc = dasd_state_known_to_basic(device);
483
484 if (!rc &&
485 device->state == DASD_STATE_BASIC &&
486 device->target >= DASD_STATE_READY)
487 rc = dasd_state_basic_to_ready(device);
488
39ccf95e
HH		 489 if (!rc &&
490 device->state == DASD_STATE_UNFMT &&
491 device->target > DASD_STATE_UNFMT)
492 rc = -EPERM;
493
1da177e4
LT		 494 if (!rc &&
495 device->state == DASD_STATE_READY &&
496 device->target >= DASD_STATE_ONLINE)
497 rc = dasd_state_ready_to_online(device);
498
499 return rc;
500}
501
502/*
503 * Device shutdown state changes.
504 */
8e09f215 505static int dasd_decrease_state(struct dasd_device *device)
1da177e4 506{
8f61701b
HH		 507 int rc;
508
509 rc = 0;
1da177e4
LT		 510 if (device->state == DASD_STATE_ONLINE &&
511 device->target <= DASD_STATE_READY)
8f61701b 512 rc = dasd_state_online_to_ready(device);
138c014d 513
8f61701b
HH		 514 if (!rc &&
515 device->state == DASD_STATE_READY &&
1da177e4 516 device->target <= DASD_STATE_BASIC)
8f61701b 517 rc = dasd_state_ready_to_basic(device);
90f0094d 518
8f61701b
HH		 519 if (!rc &&
520 device->state == DASD_STATE_UNFMT &&
90f0094d 521 device->target <= DASD_STATE_BASIC)
8f61701b 522 rc = dasd_state_unfmt_to_basic(device);
90f0094d 523
8f61701b
HH		 524 if (!rc &&
525 device->state == DASD_STATE_BASIC &&
1da177e4 526 device->target <= DASD_STATE_KNOWN)
8f61701b 527 rc = dasd_state_basic_to_known(device);
138c014d 528
8f61701b
HH		 529 if (!rc &&
530 device->state == DASD_STATE_KNOWN &&
1da177e4 531 device->target <= DASD_STATE_NEW)
8f61701b 532 rc = dasd_state_known_to_new(device);
1da177e4 533
8f61701b 534 return rc;
1da177e4
LT		 535}
536
537/*
538 * This is the main startup/shutdown routine.
539 */
8e09f215 540static void dasd_change_state(struct dasd_device *device)
1da177e4 541{
181d9522 542 int rc;
1da177e4
LT		 543
544 if (device->state == device->target)
545 /* Already where we want to go today... */
546 return;
547 if (device->state < device->target)
548 rc = dasd_increase_state(device);
549 else
550 rc = dasd_decrease_state(device);
181d9522
SO		 551 if (rc == -EAGAIN)
552 return;
553 if (rc)
554 device->target = device->state;
1da177e4 555
4dfd5c45
HH		 556 /* let user-space know that the device status changed */
557 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
1f08be80
SO		 558
559 if (device->state == device->target)
560 wake_up(&dasd_init_waitq);
1da177e4
LT		 561}
562
563/*
564 * Kick starter for devices that did not complete the startup/shutdown
565 * procedure or were sleeping because of a pending state.
566 * dasd_kick_device will schedule a call do do_kick_device to the kernel
567 * event daemon.
568 */
8e09f215 569static void do_kick_device(struct work_struct *work)
1da177e4 570{
4927b3f7 571 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
9eb25122 572 mutex_lock(&device->state_mutex);
1da177e4 573 dasd_change_state(device);
9eb25122 574 mutex_unlock(&device->state_mutex);
8e09f215 575 dasd_schedule_device_bh(device);
1da177e4
LT		 576 dasd_put_device(device);
577}
578
8e09f215 579void dasd_kick_device(struct dasd_device *device)
1da177e4
LT		 580{
581 dasd_get_device(device);
582 /* queue call to dasd_kick_device to the kernel event daemon. */
583 schedule_work(&device->kick_work);
584}
585
501183f2
SH		 586/*
587 * dasd_reload_device will schedule a call do do_reload_device to the kernel
588 * event daemon.
589 */
590static void do_reload_device(struct work_struct *work)
591{
592 struct dasd_device *device = container_of(work, struct dasd_device,
593 reload_device);
594 device->discipline->reload(device);
595 dasd_put_device(device);
596}
597
598void dasd_reload_device(struct dasd_device *device)
599{
600 dasd_get_device(device);
601 /* queue call to dasd_reload_device to the kernel event daemon. */
602 schedule_work(&device->reload_device);
603}
604EXPORT_SYMBOL(dasd_reload_device);
605
d41dd122
SH		 606/*
607 * dasd_restore_device will schedule a call do do_restore_device to the kernel
608 * event daemon.
609 */
610static void do_restore_device(struct work_struct *work)
611{
612 struct dasd_device *device = container_of(work, struct dasd_device,
613 restore_device);
614 device->cdev->drv->restore(device->cdev);
615 dasd_put_device(device);
616}
617
618void dasd_restore_device(struct dasd_device *device)
619{
620 dasd_get_device(device);
621 /* queue call to dasd_restore_device to the kernel event daemon. */
622 schedule_work(&device->restore_device);
623}
624
1da177e4
LT		 625/*
626 * Set the target state for a device and starts the state change.
627 */
8e09f215 628void dasd_set_target_state(struct dasd_device *device, int target)
1da177e4 629{
f3445a1a 630 dasd_get_device(device);
9eb25122 631 mutex_lock(&device->state_mutex);
1da177e4
LT		 632 /* If we are in probeonly mode stop at DASD_STATE_READY. */
633 if (dasd_probeonly && target > DASD_STATE_READY)
634 target = DASD_STATE_READY;
635 if (device->target != target) {
9eb25122 636 if (device->state == target)
1da177e4
LT		 637 wake_up(&dasd_init_waitq);
638 device->target = target;
639 }
640 if (device->state != device->target)
641 dasd_change_state(device);
9eb25122
SH		 642 mutex_unlock(&device->state_mutex);
643 dasd_put_device(device);
1da177e4
LT		 644}
645
646/*
647 * Enable devices with device numbers in [from..to].
648 */
8e09f215 649static inline int _wait_for_device(struct dasd_device *device)
1da177e4
LT		 650{
651 return (device->state == device->target);
652}
653
8e09f215 654void dasd_enable_device(struct dasd_device *device)
1da177e4
LT		 655{
656 dasd_set_target_state(device, DASD_STATE_ONLINE);
657 if (device->state <= DASD_STATE_KNOWN)
658 /* No discipline for device found. */
659 dasd_set_target_state(device, DASD_STATE_NEW);
660 /* Now wait for the devices to come up. */
661 wait_event(dasd_init_waitq, _wait_for_device(device));
25e2cf1c
SH		 662
663 dasd_reload_device(device);
664 if (device->discipline->kick_validate)
665 device->discipline->kick_validate(device);
1da177e4
LT		 666}
667
668/*
669 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
670 */
1da177e4 671
4fa52aa7 672unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
1da177e4 673
4fa52aa7
SW		 674#ifdef CONFIG_DASD_PROFILE
675struct dasd_profile_info dasd_global_profile_data;
676static struct dentry *dasd_global_profile_dentry;
677static struct dentry *dasd_debugfs_global_entry;
1da177e4
LT		 678
679/*
680 * Add profiling information for cqr before execution.
681 */
8e09f215
SW		 682static void dasd_profile_start(struct dasd_block *block,
683 struct dasd_ccw_req *cqr,
684 struct request *req)
1da177e4
LT		 685{
686 struct list_head *l;
687 unsigned int counter;
4fa52aa7 688 struct dasd_device *device;
1da177e4
LT		 689
690 /* count the length of the chanq for statistics */
691 counter = 0;
4fa52aa7
SW		 692 if (dasd_global_profile_level || block->profile.data)
693 list_for_each(l, &block->ccw_queue)
694 if (++counter >= 31)
695 break;
696
697 if (dasd_global_profile_level) {
698 dasd_global_profile_data.dasd_io_nr_req[counter]++;
699 if (rq_data_dir(req) == READ)
700 dasd_global_profile_data.dasd_read_nr_req[counter]++;
701 }
702
703 spin_lock(&block->profile.lock);
704 if (block->profile.data)
705 block->profile.data->dasd_io_nr_req[counter]++;
706 if (rq_data_dir(req) == READ)
707 block->profile.data->dasd_read_nr_req[counter]++;
708 spin_unlock(&block->profile.lock);
709
710 /*
711 * We count the request for the start device, even though it may run on
712 * some other device due to error recovery. This way we make sure that
713 * we count each request only once.
714 */
715 device = cqr->startdev;
716 if (device->profile.data) {
717 counter = 1; /* request is not yet queued on the start device */
718 list_for_each(l, &device->ccw_queue)
719 if (++counter >= 31)
720 break;
721 }
722 spin_lock(&device->profile.lock);
723 if (device->profile.data) {
724 device->profile.data->dasd_io_nr_req[counter]++;
725 if (rq_data_dir(req) == READ)
726 device->profile.data->dasd_read_nr_req[counter]++;
727 }
728 spin_unlock(&device->profile.lock);
1da177e4
LT		 729}
730
731/*
732 * Add profiling information for cqr after execution.
733 */
4fa52aa7
SW		 734
735#define dasd_profile_counter(value, index) \
736{ \
737 for (index = 0; index < 31 && value >> (2+index); index++) \
738 ; \
739}
740
741static void dasd_profile_end_add_data(struct dasd_profile_info *data,
742 int is_alias,
743 int is_tpm,
744 int is_read,
745 long sectors,
746 int sectors_ind,
747 int tottime_ind,
748 int tottimeps_ind,
749 int strtime_ind,
750 int irqtime_ind,
751 int irqtimeps_ind,
752 int endtime_ind)
753{
754 /* in case of an overflow, reset the whole profile */
755 if (data->dasd_io_reqs == UINT_MAX) {
756 memset(data, 0, sizeof(*data));
757 getnstimeofday(&data->starttod);
758 }
759 data->dasd_io_reqs++;
760 data->dasd_io_sects += sectors;
761 if (is_alias)
762 data->dasd_io_alias++;
763 if (is_tpm)
764 data->dasd_io_tpm++;
765
766 data->dasd_io_secs[sectors_ind]++;
767 data->dasd_io_times[tottime_ind]++;
768 data->dasd_io_timps[tottimeps_ind]++;
769 data->dasd_io_time1[strtime_ind]++;
770 data->dasd_io_time2[irqtime_ind]++;
771 data->dasd_io_time2ps[irqtimeps_ind]++;
772 data->dasd_io_time3[endtime_ind]++;
773
774 if (is_read) {
775 data->dasd_read_reqs++;
776 data->dasd_read_sects += sectors;
777 if (is_alias)
778 data->dasd_read_alias++;
779 if (is_tpm)
780 data->dasd_read_tpm++;
781 data->dasd_read_secs[sectors_ind]++;
782 data->dasd_read_times[tottime_ind]++;
783 data->dasd_read_time1[strtime_ind]++;
784 data->dasd_read_time2[irqtime_ind]++;
785 data->dasd_read_time3[endtime_ind]++;
786 }
787}
788
8e09f215
SW		 789static void dasd_profile_end(struct dasd_block *block,
790 struct dasd_ccw_req *cqr,
791 struct request *req)
1da177e4
LT		 792{
793 long strtime, irqtime, endtime, tottime; /* in microseconds */
794 long tottimeps, sectors;
4fa52aa7
SW		 795 struct dasd_device *device;
796 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
797 int irqtime_ind, irqtimeps_ind, endtime_ind;
1da177e4 798
4fa52aa7
SW		 799 device = cqr->startdev;
800 if (!(dasd_global_profile_level ||
801 block->profile.data ||
802 device->profile.data))
1da177e4
LT		 803 return;
804
83096ebf 805 sectors = blk_rq_sectors(req);
1da177e4
LT		 806 if (!cqr->buildclk || !cqr->startclk ||
807 !cqr->stopclk || !cqr->endclk ||
808 !sectors)
809 return;
810
811 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
812 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
813 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
814 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
815 tottimeps = tottime / sectors;
816
4fa52aa7
SW		 817 dasd_profile_counter(sectors, sectors_ind);
818 dasd_profile_counter(tottime, tottime_ind);
819 dasd_profile_counter(tottimeps, tottimeps_ind);
820 dasd_profile_counter(strtime, strtime_ind);
821 dasd_profile_counter(irqtime, irqtime_ind);
822 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
823 dasd_profile_counter(endtime, endtime_ind);
824
825 if (dasd_global_profile_level) {
826 dasd_profile_end_add_data(&dasd_global_profile_data,
827 cqr->startdev != block->base,
828 cqr->cpmode == 1,
829 rq_data_dir(req) == READ,
830 sectors, sectors_ind, tottime_ind,
831 tottimeps_ind, strtime_ind,
832 irqtime_ind, irqtimeps_ind,
833 endtime_ind);
834 }
835
836 spin_lock(&block->profile.lock);
837 if (block->profile.data)
838 dasd_profile_end_add_data(block->profile.data,
839 cqr->startdev != block->base,
840 cqr->cpmode == 1,
841 rq_data_dir(req) == READ,
842 sectors, sectors_ind, tottime_ind,
843 tottimeps_ind, strtime_ind,
844 irqtime_ind, irqtimeps_ind,
845 endtime_ind);
846 spin_unlock(&block->profile.lock);
847
848 spin_lock(&device->profile.lock);
849 if (device->profile.data)
850 dasd_profile_end_add_data(device->profile.data,
851 cqr->startdev != block->base,
852 cqr->cpmode == 1,
853 rq_data_dir(req) == READ,
854 sectors, sectors_ind, tottime_ind,
855 tottimeps_ind, strtime_ind,
856 irqtime_ind, irqtimeps_ind,
857 endtime_ind);
858 spin_unlock(&device->profile.lock);
859}
860
861void dasd_profile_reset(struct dasd_profile *profile)
862{
863 struct dasd_profile_info *data;
864
865 spin_lock_bh(&profile->lock);
866 data = profile->data;
867 if (!data) {
868 spin_unlock_bh(&profile->lock);
869 return;
870 }
871 memset(data, 0, sizeof(*data));
872 getnstimeofday(&data->starttod);
873 spin_unlock_bh(&profile->lock);
874}
875
876void dasd_global_profile_reset(void)
877{
878 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data));
879 getnstimeofday(&dasd_global_profile_data.starttod);
880}
881
882int dasd_profile_on(struct dasd_profile *profile)
883{
884 struct dasd_profile_info *data;
885
886 data = kzalloc(sizeof(*data), GFP_KERNEL);
887 if (!data)
888 return -ENOMEM;
889 spin_lock_bh(&profile->lock);
890 if (profile->data) {
891 spin_unlock_bh(&profile->lock);
892 kfree(data);
893 return 0;
894 }
895 getnstimeofday(&data->starttod);
896 profile->data = data;
897 spin_unlock_bh(&profile->lock);
898 return 0;
899}
900
901void dasd_profile_off(struct dasd_profile *profile)
902{
903 spin_lock_bh(&profile->lock);
904 kfree(profile->data);
905 profile->data = NULL;
906 spin_unlock_bh(&profile->lock);
907}
908
909char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
910{
911 char *buffer;
912
e4258d55 913 buffer = vmalloc(user_len + 1);
4fa52aa7
SW		 914 if (buffer == NULL)
915 return ERR_PTR(-ENOMEM);
916 if (copy_from_user(buffer, user_buf, user_len) != 0) {
e4258d55 917 vfree(buffer);
4fa52aa7
SW		 918 return ERR_PTR(-EFAULT);
919 }
920 /* got the string, now strip linefeed. */
921 if (buffer[user_len - 1] == '\n')
922 buffer[user_len - 1] = 0;
923 else
924 buffer[user_len] = 0;
925 return buffer;
1da177e4 926}
4fa52aa7
SW		 927
928static ssize_t dasd_stats_write(struct file *file,
929 const char __user *user_buf,
930 size_t user_len, loff_t *pos)
931{
932 char *buffer, *str;
933 int rc;
934 struct seq_file *m = (struct seq_file *)file->private_data;
935 struct dasd_profile *prof = m->private;
936
937 if (user_len > 65536)
938 user_len = 65536;
939 buffer = dasd_get_user_string(user_buf, user_len);
940 if (IS_ERR(buffer))
941 return PTR_ERR(buffer);
942
943 str = skip_spaces(buffer);
944 rc = user_len;
945 if (strncmp(str, "reset", 5) == 0) {
946 dasd_profile_reset(prof);
947 } else if (strncmp(str, "on", 2) == 0) {
948 rc = dasd_profile_on(prof);
949 if (!rc)
950 rc = user_len;
951 } else if (strncmp(str, "off", 3) == 0) {
952 dasd_profile_off(prof);
953 } else
954 rc = -EINVAL;
e4258d55 955 vfree(buffer);
4fa52aa7
SW		 956 return rc;
957}
958
959static void dasd_stats_array(struct seq_file *m, unsigned int *array)
960{
961 int i;
962
963 for (i = 0; i < 32; i++)
964 seq_printf(m, "%u ", array[i]);
965 seq_putc(m, '\n');
966}
967
968static void dasd_stats_seq_print(struct seq_file *m,
969 struct dasd_profile_info *data)
970{
971 seq_printf(m, "start_time %ld.%09ld\n",
972 data->starttod.tv_sec, data->starttod.tv_nsec);
973 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
974 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
975 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
976 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
977 seq_printf(m, "histogram_sectors ");
978 dasd_stats_array(m, data->dasd_io_secs);
979 seq_printf(m, "histogram_io_times ");
980 dasd_stats_array(m, data->dasd_io_times);
981 seq_printf(m, "histogram_io_times_weighted ");
982 dasd_stats_array(m, data->dasd_io_timps);
983 seq_printf(m, "histogram_time_build_to_ssch ");
984 dasd_stats_array(m, data->dasd_io_time1);
985 seq_printf(m, "histogram_time_ssch_to_irq ");
986 dasd_stats_array(m, data->dasd_io_time2);
987 seq_printf(m, "histogram_time_ssch_to_irq_weighted ");
988 dasd_stats_array(m, data->dasd_io_time2ps);
989 seq_printf(m, "histogram_time_irq_to_end ");
990 dasd_stats_array(m, data->dasd_io_time3);
991 seq_printf(m, "histogram_ccw_queue_length ");
992 dasd_stats_array(m, data->dasd_io_nr_req);
993 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
994 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
995 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
996 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
997 seq_printf(m, "histogram_read_sectors ");
998 dasd_stats_array(m, data->dasd_read_secs);
999 seq_printf(m, "histogram_read_times ");
1000 dasd_stats_array(m, data->dasd_read_times);
1001 seq_printf(m, "histogram_read_time_build_to_ssch ");
1002 dasd_stats_array(m, data->dasd_read_time1);
1003 seq_printf(m, "histogram_read_time_ssch_to_irq ");
1004 dasd_stats_array(m, data->dasd_read_time2);
1005 seq_printf(m, "histogram_read_time_irq_to_end ");
1006 dasd_stats_array(m, data->dasd_read_time3);
1007 seq_printf(m, "histogram_read_ccw_queue_length ");
1008 dasd_stats_array(m, data->dasd_read_nr_req);
1009}
1010
1011static int dasd_stats_show(struct seq_file *m, void *v)
1012{
1013 struct dasd_profile *profile;
1014 struct dasd_profile_info *data;
1015
1016 profile = m->private;
1017 spin_lock_bh(&profile->lock);
1018 data = profile->data;
1019 if (!data) {
1020 spin_unlock_bh(&profile->lock);
1021 seq_printf(m, "disabled\n");
1022 return 0;
1023 }
1024 dasd_stats_seq_print(m, data);
1025 spin_unlock_bh(&profile->lock);
1026 return 0;
1027}
1028
1029static int dasd_stats_open(struct inode *inode, struct file *file)
1030{
1031 struct dasd_profile *profile = inode->i_private;
1032 return single_open(file, dasd_stats_show, profile);
1033}
1034
1035static const struct file_operations dasd_stats_raw_fops = {
1036 .owner = THIS_MODULE,
1037 .open = dasd_stats_open,
1038 .read = seq_read,
1039 .llseek = seq_lseek,
1040 .release = single_release,
1041 .write = dasd_stats_write,
1042};
1043
1044static ssize_t dasd_stats_global_write(struct file *file,
1045 const char __user *user_buf,
1046 size_t user_len, loff_t *pos)
1047{
1048 char *buffer, *str;
1049 ssize_t rc;
1050
1051 if (user_len > 65536)
1052 user_len = 65536;
1053 buffer = dasd_get_user_string(user_buf, user_len);
1054 if (IS_ERR(buffer))
1055 return PTR_ERR(buffer);
1056 str = skip_spaces(buffer);
1057 rc = user_len;
1058 if (strncmp(str, "reset", 5) == 0) {
1059 dasd_global_profile_reset();
1060 } else if (strncmp(str, "on", 2) == 0) {
1061 dasd_global_profile_reset();
1062 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
1063 } else if (strncmp(str, "off", 3) == 0) {
1064 dasd_global_profile_level = DASD_PROFILE_OFF;
1065 } else
1066 rc = -EINVAL;
e4258d55 1067 vfree(buffer);
4fa52aa7
SW		 1068 return rc;
1069}
1070
1071static int dasd_stats_global_show(struct seq_file *m, void *v)
1072{
1073 if (!dasd_global_profile_level) {
1074 seq_printf(m, "disabled\n");
1075 return 0;
1076 }
1077 dasd_stats_seq_print(m, &dasd_global_profile_data);
1078 return 0;
1079}
1080
1081static int dasd_stats_global_open(struct inode *inode, struct file *file)
1082{
1083 return single_open(file, dasd_stats_global_show, NULL);
1084}
1085
1086static const struct file_operations dasd_stats_global_fops = {
1087 .owner = THIS_MODULE,
1088 .open = dasd_stats_global_open,
1089 .read = seq_read,
1090 .llseek = seq_lseek,
1091 .release = single_release,
1092 .write = dasd_stats_global_write,
1093};
1094
1095static void dasd_profile_init(struct dasd_profile *profile,
1096 struct dentry *base_dentry)
1097{
f4ae40a6 1098 umode_t mode;
4fa52aa7
SW		 1099 struct dentry *pde;
1100
1101 if (!base_dentry)
1102 return;
1103 profile->dentry = NULL;
1104 profile->data = NULL;
1105 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1106 pde = debugfs_create_file("statistics", mode, base_dentry,
1107 profile, &dasd_stats_raw_fops);
1108 if (pde && !IS_ERR(pde))
1109 profile->dentry = pde;
1110 return;
1111}
1112
1113static void dasd_profile_exit(struct dasd_profile *profile)
1114{
1115 dasd_profile_off(profile);
1116 if (profile->dentry) {
1117 debugfs_remove(profile->dentry);
1118 profile->dentry = NULL;
1119 }
1120}
1121
1122static void dasd_statistics_removeroot(void)
1123{
1124 dasd_global_profile_level = DASD_PROFILE_OFF;
1125 if (dasd_global_profile_dentry) {
1126 debugfs_remove(dasd_global_profile_dentry);
1127 dasd_global_profile_dentry = NULL;
1128 }
1129 if (dasd_debugfs_global_entry)
1130 debugfs_remove(dasd_debugfs_global_entry);
1131 if (dasd_debugfs_root_entry)
1132 debugfs_remove(dasd_debugfs_root_entry);
1133}
1134
1135static void dasd_statistics_createroot(void)
1136{
f4ae40a6 1137 umode_t mode;
4fa52aa7
SW		 1138 struct dentry *pde;
1139
1140 dasd_debugfs_root_entry = NULL;
1141 dasd_debugfs_global_entry = NULL;
1142 dasd_global_profile_dentry = NULL;
1143 pde = debugfs_create_dir("dasd", NULL);
1144 if (!pde || IS_ERR(pde))
1145 goto error;
1146 dasd_debugfs_root_entry = pde;
1147 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1148 if (!pde || IS_ERR(pde))
1149 goto error;
1150 dasd_debugfs_global_entry = pde;
1151
1152 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1153 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry,
1154 NULL, &dasd_stats_global_fops);
1155 if (!pde || IS_ERR(pde))
1156 goto error;
1157 dasd_global_profile_dentry = pde;
1158 return;
1159
1160error:
1161 DBF_EVENT(DBF_ERR, "%s",
1162 "Creation of the dasd debugfs interface failed");
1163 dasd_statistics_removeroot();
1164 return;
1165}
1166
1da177e4 1167#else
8e09f215
SW		 1168#define dasd_profile_start(block, cqr, req) do {} while (0)
1169#define dasd_profile_end(block, cqr, req) do {} while (0)
4fa52aa7
SW		 1170
1171static void dasd_statistics_createroot(void)
1172{
1173 return;
1174}
1175
1176static void dasd_statistics_removeroot(void)
1177{
1178 return;
1179}
1180
1181int dasd_stats_generic_show(struct seq_file *m, void *v)
1182{
1183 seq_printf(m, "Statistics are not activated in this kernel\n");
1184 return 0;
1185}
1186
1187static void dasd_profile_init(struct dasd_profile *profile,
1188 struct dentry *base_dentry)
1189{
1190 return;
1191}
1192
1193static void dasd_profile_exit(struct dasd_profile *profile)
1194{
1195 return;
1196}
1197
1198int dasd_profile_on(struct dasd_profile *profile)
1199{
1200 return 0;
1201}
1202
1da177e4
LT		 1203#endif /* CONFIG_DASD_PROFILE */
1204
1205/*
1206 * Allocate memory for a channel program with 'cplength' channel
1207 * command words and 'datasize' additional space. There are two
1208 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1209 * memory and 2) dasd_smalloc_request uses the static ccw memory
1210 * that gets allocated for each device.
1211 */
68b781fe 1212struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
8e09f215
SW		 1213 int datasize,
1214 struct dasd_device *device)
1da177e4
LT		 1215{
1216 struct dasd_ccw_req *cqr;
1217
1218 /* Sanity checks */
68b781fe 1219 BUG_ON(datasize > PAGE_SIZE ||
7ac1e877 1220 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1da177e4 1221
88abaab4 1222 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1da177e4
LT		 1223 if (cqr == NULL)
1224 return ERR_PTR(-ENOMEM);
1da177e4
LT		 1225 cqr->cpaddr = NULL;
1226 if (cplength > 0) {
88abaab4 1227 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1da177e4
LT		 1228 GFP_ATOMIC | GFP_DMA);
1229 if (cqr->cpaddr == NULL) {
1230 kfree(cqr);
1231 return ERR_PTR(-ENOMEM);
1232 }
1da177e4
LT		 1233 }
1234 cqr->data = NULL;
1235 if (datasize > 0) {
88abaab4 1236 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1da177e4 1237 if (cqr->data == NULL) {
17fd682e 1238 kfree(cqr->cpaddr);
1da177e4
LT		 1239 kfree(cqr);
1240 return ERR_PTR(-ENOMEM);
1241 }
1da177e4 1242 }
68b781fe 1243 cqr->magic = magic;
1da177e4
LT		 1244 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1245 dasd_get_device(device);
1246 return cqr;
1247}
1248
68b781fe 1249struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
8e09f215
SW		 1250 int datasize,
1251 struct dasd_device *device)
1da177e4
LT		 1252{
1253 unsigned long flags;
1254 struct dasd_ccw_req *cqr;
1255 char *data;
1256 int size;
1257
1da177e4
LT		 1258 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1259 if (cplength > 0)
1260 size += cplength * sizeof(struct ccw1);
1261 if (datasize > 0)
1262 size += datasize;
1263 spin_lock_irqsave(&device->mem_lock, flags);
1264 cqr = (struct dasd_ccw_req *)
1265 dasd_alloc_chunk(&device->ccw_chunks, size);
1266 spin_unlock_irqrestore(&device->mem_lock, flags);
1267 if (cqr == NULL)
1268 return ERR_PTR(-ENOMEM);
1269 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1270 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1271 cqr->cpaddr = NULL;
1272 if (cplength > 0) {
1273 cqr->cpaddr = (struct ccw1 *) data;
1274 data += cplength*sizeof(struct ccw1);
1275 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1276 }
1277 cqr->data = NULL;
1278 if (datasize > 0) {
1279 cqr->data = data;
1280 memset(cqr->data, 0, datasize);
1281 }
68b781fe 1282 cqr->magic = magic;
1da177e4
LT		 1283 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1284 dasd_get_device(device);
1285 return cqr;
1286}
1287
1288/*
1289 * Free memory of a channel program. This function needs to free all the
1290 * idal lists that might have been created by dasd_set_cda and the
1291 * struct dasd_ccw_req itself.
1292 */
8e09f215 1293void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4 1294{
347a8dc3 1295#ifdef CONFIG_64BIT
1da177e4
LT		 1296 struct ccw1 *ccw;
1297
1298 /* Clear any idals used for the request. */
1299 ccw = cqr->cpaddr;
1300 do {
1301 clear_normalized_cda(ccw);
1302 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1303#endif
17fd682e
JJ		 1304 kfree(cqr->cpaddr);
1305 kfree(cqr->data);
1da177e4
LT		 1306 kfree(cqr);
1307 dasd_put_device(device);
1308}
1309
8e09f215 1310void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1da177e4
LT		 1311{
1312 unsigned long flags;
1313
1314 spin_lock_irqsave(&device->mem_lock, flags);
1315 dasd_free_chunk(&device->ccw_chunks, cqr);
1316 spin_unlock_irqrestore(&device->mem_lock, flags);
1317 dasd_put_device(device);
1318}
1319
1320/*
1321 * Check discipline magic in cqr.
1322 */
8e09f215 1323static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1da177e4
LT		 1324{
1325 struct dasd_device *device;
1326
1327 if (cqr == NULL)
1328 return -EINVAL;
8e09f215 1329 device = cqr->startdev;
1da177e4 1330 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
fc19f381 1331 DBF_DEV_EVENT(DBF_WARNING, device,
1da177e4
LT		 1332 " dasd_ccw_req 0x%08x magic doesn't match"
1333 " discipline 0x%08x",
1334 cqr->magic,
1335 *(unsigned int *) device->discipline->name);
1336 return -EINVAL;
1337 }
1338 return 0;
1339}
1340
1341/*
1342 * Terminate the current i/o and set the request to clear_pending.
1343 * Timer keeps device runnig.
1344 * ccw_device_clear can fail if the i/o subsystem
1345 * is in a bad mood.
1346 */
8e09f215 1347int dasd_term_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 1348{
1349 struct dasd_device *device;
1350 int retries, rc;
fc19f381 1351 char errorstring[ERRORLENGTH];
1da177e4
LT		 1352
1353 /* Check the cqr */
1354 rc = dasd_check_cqr(cqr);
1355 if (rc)
1356 return rc;
1357 retries = 0;
8e09f215 1358 device = (struct dasd_device *) cqr->startdev;
1da177e4
LT		 1359 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1360 rc = ccw_device_clear(device->cdev, (long) cqr);
1361 switch (rc) {
1362 case 0: /* termination successful */
8e09f215 1363 cqr->status = DASD_CQR_CLEAR_PENDING;
1aae0560 1364 cqr->stopclk = get_tod_clock();
8f61701b 1365 cqr->starttime = 0;
1da177e4
LT		 1366 DBF_DEV_EVENT(DBF_DEBUG, device,
1367 "terminate cqr %p successful",
1368 cqr);
1369 break;
1370 case -ENODEV:
1371 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1372 "device gone, retry");
1373 break;
1374 case -EIO:
1375 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1376 "I/O error, retry");
1377 break;
1378 case -EINVAL:
1379 case -EBUSY:
1380 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1381 "device busy, retry later");
1382 break;
1383 default:
fc19f381
SH		 1384 /* internal error 10 - unknown rc*/
1385 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1386 dev_err(&device->cdev->dev, "An error occurred in the "
1387 "DASD device driver, reason=%s\n", errorstring);
1da177e4
LT		 1388 BUG();
1389 break;
1390 }
1391 retries++;
1392 }
8e09f215 1393 dasd_schedule_device_bh(device);
1da177e4
LT		 1394 return rc;
1395}
1396
1397/*
1398 * Start the i/o. This start_IO can fail if the channel is really busy.
1399 * In that case set up a timer to start the request later.
1400 */
8e09f215 1401int dasd_start_IO(struct dasd_ccw_req *cqr)
1da177e4
LT		 1402{
1403 struct dasd_device *device;
1404 int rc;
fc19f381 1405 char errorstring[ERRORLENGTH];
1da177e4
LT		 1406
1407 /* Check the cqr */
1408 rc = dasd_check_cqr(cqr);
6cc7f168
SW		 1409 if (rc) {
1410 cqr->intrc = rc;
1da177e4 1411 return rc;
6cc7f168 1412 }
8e09f215 1413 device = (struct dasd_device *) cqr->startdev;
5a27e60d
SW		 1414 if (((cqr->block &&
1415 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1416 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1417 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1418 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1419 "because of stolen lock", cqr);
1420 cqr->status = DASD_CQR_ERROR;
1421 cqr->intrc = -EPERM;
1422 return -EPERM;
1423 }
1da177e4 1424 if (cqr->retries < 0) {
fc19f381
SH		 1425 /* internal error 14 - start_IO run out of retries */
1426 sprintf(errorstring, "14 %p", cqr);
1427 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1428 "device driver, reason=%s\n", errorstring);
8e09f215 1429 cqr->status = DASD_CQR_ERROR;
1da177e4
LT		 1430 return -EIO;
1431 }
1aae0560 1432 cqr->startclk = get_tod_clock();
1da177e4
LT		 1433 cqr->starttime = jiffies;
1434 cqr->retries--;
a4d26c6a
SW		 1435 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1436 cqr->lpm &= device->path_data.opm;
1437 if (!cqr->lpm)
1438 cqr->lpm = device->path_data.opm;
1439 }
f3eb5384
SW		 1440 if (cqr->cpmode == 1) {
1441 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1442 (long) cqr, cqr->lpm);
1443 } else {
1444 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1445 (long) cqr, cqr->lpm, 0);
1446 }
1da177e4
LT		 1447 switch (rc) {
1448 case 0:
1449 cqr->status = DASD_CQR_IN_IO;
1da177e4
LT		 1450 break;
1451 case -EBUSY:
a4d26c6a 1452 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 1453 "start_IO: device busy, retry later");
1454 break;
1455 case -ETIMEDOUT:
a4d26c6a 1456 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4
LT		 1457 "start_IO: request timeout, retry later");
1458 break;
1459 case -EACCES:
a4d26c6a
SW		 1460 /* -EACCES indicates that the request used only a subset of the
1461 * available paths and all these paths are gone. If the lpm of
1462 * this request was only a subset of the opm (e.g. the ppm) then
1463 * we just do a retry with all available paths.
1464 * If we already use the full opm, something is amiss, and we
1465 * need a full path verification.
1da177e4 1466 */
a4d26c6a
SW		 1467 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1468 DBF_DEV_EVENT(DBF_WARNING, device,
1469 "start_IO: selected paths gone (%x)",
1470 cqr->lpm);
1471 } else if (cqr->lpm != device->path_data.opm) {
1472 cqr->lpm = device->path_data.opm;
1473 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1474 "start_IO: selected paths gone,"
1475 " retry on all paths");
1476 } else {
1477 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1478 "start_IO: all paths in opm gone,"
1479 " do path verification");
1480 dasd_generic_last_path_gone(device);
1481 device->path_data.opm = 0;
1482 device->path_data.ppm = 0;
1483 device->path_data.npm = 0;
1484 device->path_data.tbvpm =
1485 ccw_device_get_path_mask(device->cdev);
1486 }
1da177e4
LT		 1487 break;
1488 case -ENODEV:
a4d26c6a 1489 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384
SW		 1490 "start_IO: -ENODEV device gone, retry");
1491 break;
1da177e4 1492 case -EIO:
a4d26c6a 1493 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
f3eb5384 1494 "start_IO: -EIO device gone, retry");
1da177e4 1495 break;
d41dd122
SH		 1496 case -EINVAL:
1497 /* most likely caused in power management context */
a4d26c6a 1498 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
d41dd122
SH		 1499 "start_IO: -EINVAL device currently "
1500 "not accessible");
1501 break;
1da177e4 1502 default:
fc19f381
SH		 1503 /* internal error 11 - unknown rc */
1504 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1505 dev_err(&device->cdev->dev,
1506 "An error occurred in the DASD device driver, "
1507 "reason=%s\n", errorstring);
1da177e4
LT		 1508 BUG();
1509 break;
1510 }
6cc7f168 1511 cqr->intrc = rc;
1da177e4
LT		 1512 return rc;
1513}
1514
1515/*
1516 * Timeout function for dasd devices. This is used for different purposes
1517 * 1) missing interrupt handler for normal operation
1518 * 2) delayed start of request where start_IO failed with -EBUSY
1519 * 3) timeout for missing state change interrupts
1520 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1521 * DASD_CQR_QUEUED for 2) and 3).
1522 */
8e09f215 1523static void dasd_device_timeout(unsigned long ptr)
1da177e4
LT		 1524{
1525 unsigned long flags;
1526 struct dasd_device *device;
1527
1528 device = (struct dasd_device *) ptr;
1529 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1530 /* re-activate request queue */
eb6e199b 1531 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1da177e4 1532 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
8e09f215 1533 dasd_schedule_device_bh(device);
1da177e4
LT		 1534}
1535
1536/*
1537 * Setup timeout for a device in jiffies.
1538 */
8e09f215 1539void dasd_device_set_timer(struct dasd_device *device, int expires)
1da177e4 1540{
48cae885
SW		 1541 if (expires == 0)
1542 del_timer(&device->timer);
1543 else
1544 mod_timer(&device->timer, jiffies + expires);
1da177e4
LT		 1545}
1546
1547/*
1548 * Clear timeout for a device.
1549 */
8e09f215 1550void dasd_device_clear_timer(struct dasd_device *device)
1da177e4 1551{
48cae885 1552 del_timer(&device->timer);
1da177e4
LT		 1553}
1554
8e09f215
SW		 1555static void dasd_handle_killed_request(struct ccw_device *cdev,
1556 unsigned long intparm)
1da177e4
LT		 1557{
1558 struct dasd_ccw_req *cqr;
1559 struct dasd_device *device;
1560
f16f5843
SW		 1561 if (!intparm)
1562 return;
1da177e4
LT		 1563 cqr = (struct dasd_ccw_req *) intparm;
1564 if (cqr->status != DASD_CQR_IN_IO) {
b8ed5dd5
SH		 1565 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1566 "invalid status in handle_killed_request: "
1567 "%02x", cqr->status);
1da177e4
LT		 1568 return;
1569 }
1570
589c74d5
SH		 1571 device = dasd_device_from_cdev_locked(cdev);
1572 if (IS_ERR(device)) {
1573 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1574 "unable to get device from cdev");
1575 return;
1576 }
1577
1578 if (!cqr->startdev ||
1579 device != cqr->startdev ||
1580 strncmp(cqr->startdev->discipline->ebcname,
1581 (char *) &cqr->magic, 4)) {
294001a8
SH		 1582 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1583 "invalid device in request");
589c74d5 1584 dasd_put_device(device);
1da177e4
LT		 1585 return;
1586 }
1587
1588 /* Schedule request to be retried. */
1589 cqr->status = DASD_CQR_QUEUED;
1590
8e09f215
SW		 1591 dasd_device_clear_timer(device);
1592 dasd_schedule_device_bh(device);
1da177e4
LT		 1593 dasd_put_device(device);
1594}
1595
8e09f215 1596void dasd_generic_handle_state_change(struct dasd_device *device)
1da177e4 1597{
20c64468
SW		 1598 /* First of all start sense subsystem status request. */
1599 dasd_eer_snss(device);
1600
eb6e199b 1601 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
8e09f215
SW		 1602 dasd_schedule_device_bh(device);
1603 if (device->block)
1604 dasd_schedule_block_bh(device->block);
1da177e4
LT		 1605}
1606
1607/*
1608 * Interrupt handler for "normal" ssch-io based dasd devices.
1609 */
8e09f215
SW		 1610void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1611 struct irb *irb)
1da177e4
LT		 1612{
1613 struct dasd_ccw_req *cqr, *next;
1614 struct dasd_device *device;
1615 unsigned long long now;
1616 int expires;
1da177e4
LT		 1617
1618 if (IS_ERR(irb)) {
1619 switch (PTR_ERR(irb)) {
1620 case -EIO:
1da177e4
LT		 1621 break;
1622 case -ETIMEDOUT:
b8ed5dd5
SH		 1623 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1624 "request timed out\n", __func__);
1da177e4
LT		 1625 break;
1626 default:
b8ed5dd5
SH		 1627 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1628 "unknown error %ld\n", __func__,
1629 PTR_ERR(irb));
1da177e4 1630 }
f16f5843 1631 dasd_handle_killed_request(cdev, intparm);
1da177e4
LT		 1632 return;
1633 }
1634
1aae0560 1635 now = get_tod_clock();
8e09f215 1636 cqr = (struct dasd_ccw_req *) intparm;
5a27e60d
SW		 1637 /* check for conditions that should be handled immediately */
1638 if (!cqr ||
1639 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1640 scsw_cstat(&irb->scsw) == 0)) {
a5a0061f
SW		 1641 if (cqr)
1642 memcpy(&cqr->irb, irb, sizeof(*irb));
a00bfd71 1643 device = dasd_device_from_cdev_locked(cdev);
56b86b61
SH		 1644 if (IS_ERR(device))
1645 return;
1646 /* ignore unsolicited interrupts for DIAG discipline */
1647 if (device->discipline == dasd_diag_discipline_pointer) {
1da177e4 1648 dasd_put_device(device);
56b86b61 1649 return;
1da177e4 1650 }
5a27e60d
SW		 1651 device->discipline->dump_sense_dbf(device, irb, "int");
1652 if (device->features & DASD_FEATURE_ERPLOG)
1653 device->discipline->dump_sense(device, cqr, irb);
1654 device->discipline->check_for_device_change(device, cqr, irb);
56b86b61 1655 dasd_put_device(device);
1da177e4 1656 }
5a27e60d
SW		 1657 if (!cqr)
1658 return;
1da177e4 1659
8e09f215
SW		 1660 device = (struct dasd_device *) cqr->startdev;
1661 if (!device ||
1da177e4 1662 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
294001a8
SH		 1663 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1664 "invalid device in request");
1da177e4
LT		 1665 return;
1666 }
1667
1668 /* Check for clear pending */
8e09f215 1669 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
f3eb5384 1670 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
8e09f215
SW		 1671 cqr->status = DASD_CQR_CLEARED;
1672 dasd_device_clear_timer(device);
8f61701b 1673 wake_up(&dasd_flush_wq);
8e09f215 1674 dasd_schedule_device_bh(device);
1da177e4
LT		 1675 return;
1676 }
1677
f3eb5384 1678 /* check status - the request might have been killed by dyn detach */
1da177e4 1679 if (cqr->status != DASD_CQR_IN_IO) {
fc19f381
SH		 1680 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1681 "status %02x", dev_name(&cdev->dev), cqr->status);
1da177e4
LT		 1682 return;
1683 }
fc19f381 1684
8e09f215 1685 next = NULL;
1da177e4 1686 expires = 0;
f3eb5384
SW		 1687 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1688 scsw_cstat(&irb->scsw) == 0) {
8e09f215
SW		 1689 /* request was completed successfully */
1690 cqr->status = DASD_CQR_SUCCESS;
1da177e4
LT		 1691 cqr->stopclk = now;
1692 /* Start first request on queue if possible -> fast_io. */
8e09f215
SW		 1693 if (cqr->devlist.next != &device->ccw_queue) {
1694 next = list_entry(cqr->devlist.next,
1695 struct dasd_ccw_req, devlist);
1da177e4 1696 }
8e09f215 1697 } else { /* error */
6c5f57c7
SH		 1698 /*
1699 * If we don't want complex ERP for this request, then just
1700 * reset this and retry it in the fastpath
8e09f215 1701 */
6c5f57c7 1702 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
8e09f215 1703 cqr->retries > 0) {
a4d26c6a 1704 if (cqr->lpm == device->path_data.opm)
fc19f381
SH		 1705 DBF_DEV_EVENT(DBF_DEBUG, device,
1706 "default ERP in fastpath "
1707 "(%i retries left)",
1708 cqr->retries);
a4d26c6a
SW		 1709 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1710 cqr->lpm = device->path_data.opm;
8e09f215
SW		 1711 cqr->status = DASD_CQR_QUEUED;
1712 next = cqr;
1713 } else
1da177e4 1714 cqr->status = DASD_CQR_ERROR;
8e09f215
SW		 1715 }
1716 if (next && (next->status == DASD_CQR_QUEUED) &&
1717 (!device->stopped)) {
1718 if (device->discipline->start_IO(next) == 0)
1719 expires = next->expires;
1da177e4
LT		 1720 }
1721 if (expires != 0)
8e09f215 1722 dasd_device_set_timer(device, expires);
1da177e4 1723 else
8e09f215
SW		 1724 dasd_device_clear_timer(device);
1725 dasd_schedule_device_bh(device);
1da177e4
LT		 1726}
1727
a23ed009
SH		 1728enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1729{
1730 struct dasd_device *device;
1731
1732 device = dasd_device_from_cdev_locked(cdev);
1733
1734 if (IS_ERR(device))
1735 goto out;
1736 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1737 device->state != device->target ||
5a27e60d 1738 !device->discipline->check_for_device_change){
a23ed009
SH		 1739 dasd_put_device(device);
1740 goto out;
1741 }
5a27e60d
SW		 1742 if (device->discipline->dump_sense_dbf)
1743 device->discipline->dump_sense_dbf(device, irb, "uc");
1744 device->discipline->check_for_device_change(device, NULL, irb);
a23ed009
SH		 1745 dasd_put_device(device);
1746out:
1747 return UC_TODO_RETRY;
1748}
1749EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1750
1da177e4 1751/*
8e09f215
SW		 1752 * If we have an error on a dasd_block layer request then we cancel
1753 * and return all further requests from the same dasd_block as well.
1da177e4 1754 */
8e09f215
SW		 1755static void __dasd_device_recovery(struct dasd_device *device,
1756 struct dasd_ccw_req *ref_cqr)
1da177e4 1757{
8e09f215
SW		 1758 struct list_head *l, *n;
1759 struct dasd_ccw_req *cqr;
1da177e4 1760
8e09f215
SW		 1761 /*
1762 * only requeue request that came from the dasd_block layer
1763 */
1764 if (!ref_cqr->block)
1765 return;
1da177e4 1766
8e09f215
SW		 1767 list_for_each_safe(l, n, &device->ccw_queue) {
1768 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1769 if (cqr->status == DASD_CQR_QUEUED &&
1770 ref_cqr->block == cqr->block) {
1771 cqr->status = DASD_CQR_CLEARED;
1772 }
1773 }
1774};
1da177e4
LT		 1775
1776/*
8e09f215
SW		 1777 * Remove those ccw requests from the queue that need to be returned
1778 * to the upper layer.
1da177e4 1779 */
8e09f215
SW		 1780static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1781 struct list_head *final_queue)
1da177e4
LT		 1782{
1783 struct list_head *l, *n;
1784 struct dasd_ccw_req *cqr;
1da177e4 1785
1da177e4
LT		 1786 /* Process request with final status. */
1787 list_for_each_safe(l, n, &device->ccw_queue) {
8e09f215
SW		 1788 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1789
1da177e4 1790 /* Stop list processing at the first non-final request. */
8e09f215
SW		 1791 if (cqr->status == DASD_CQR_QUEUED ||
1792 cqr->status == DASD_CQR_IN_IO ||
1793 cqr->status == DASD_CQR_CLEAR_PENDING)
1da177e4 1794 break;
1da177e4 1795 if (cqr->status == DASD_CQR_ERROR) {
8e09f215 1796 __dasd_device_recovery(device, cqr);
20c64468 1797 }
1da177e4 1798 /* Rechain finished requests to final queue */
8e09f215 1799 list_move_tail(&cqr->devlist, final_queue);
1da177e4
LT		 1800 }
1801}
1802
1da177e4 1803/*
8e09f215
SW		 1804 * the cqrs from the final queue are returned to the upper layer
1805 * by setting a dasd_block state and calling the callback function
1da177e4 1806 */
8e09f215
SW		 1807static void __dasd_device_process_final_queue(struct dasd_device *device,
1808 struct list_head *final_queue)
1da177e4 1809{
8e09f215 1810 struct list_head *l, *n;
1da177e4 1811 struct dasd_ccw_req *cqr;
03513bcc 1812 struct dasd_block *block;
c80ee724
SH		 1813 void (*callback)(struct dasd_ccw_req *, void *data);
1814 void *callback_data;
fc19f381 1815 char errorstring[ERRORLENGTH];
f24acd45 1816
8e09f215
SW		 1817 list_for_each_safe(l, n, final_queue) {
1818 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1819 list_del_init(&cqr->devlist);
03513bcc 1820 block = cqr->block;
c80ee724
SH		 1821 callback = cqr->callback;
1822 callback_data = cqr->callback_data;
03513bcc
SW		 1823 if (block)
1824 spin_lock_bh(&block->queue_lock);
8e09f215
SW		 1825 switch (cqr->status) {
1826 case DASD_CQR_SUCCESS:
1827 cqr->status = DASD_CQR_DONE;
1828 break;
1829 case DASD_CQR_ERROR:
1830 cqr->status = DASD_CQR_NEED_ERP;
1831 break;
1832 case DASD_CQR_CLEARED:
1833 cqr->status = DASD_CQR_TERMINATED;
1834 break;
1835 default:
fc19f381
SH		 1836 /* internal error 12 - wrong cqr status*/
1837 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1838 dev_err(&device->cdev->dev,
1839 "An error occurred in the DASD device driver, "
1840 "reason=%s\n", errorstring);
8e09f215 1841 BUG();
1da177e4 1842 }
8e09f215 1843 if (cqr->callback != NULL)
c80ee724 1844 (callback)(cqr, callback_data);
03513bcc
SW		 1845 if (block)
1846 spin_unlock_bh(&block->queue_lock);
1da177e4
LT		 1847 }
1848}
1849
1850/*
1851 * Take a look at the first request on the ccw queue and check
1852 * if it reached its expire time. If so, terminate the IO.
1853 */
8e09f215 1854static void __dasd_device_check_expire(struct dasd_device *device)
1da177e4
LT		 1855{
1856 struct dasd_ccw_req *cqr;
1857
1858 if (list_empty(&device->ccw_queue))
1859 return;
8e09f215 1860 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
29145a6c
HH		 1861 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1862 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
d07dc5d8
SH		 1863 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1864 /*
1865 * IO in safe offline processing should not
1866 * run out of retries
1867 */
1868 cqr->retries++;
1869 }
29145a6c
HH		 1870 if (device->discipline->term_IO(cqr) != 0) {
1871 /* Hmpf, try again in 5 sec */
fc19f381 1872 dev_err(&device->cdev->dev,
625c94df 1873 "cqr %p timed out (%lus) but cannot be "
fc19f381
SH		 1874 "ended, retrying in 5 s\n",
1875 cqr, (cqr->expires/HZ));
7dc1da9f
SH		 1876 cqr->expires += 5*HZ;
1877 dasd_device_set_timer(device, 5*HZ);
29145a6c 1878 } else {
fc19f381 1879 dev_err(&device->cdev->dev,
625c94df 1880 "cqr %p timed out (%lus), %i retries "
fc19f381
SH		 1881 "remaining\n", cqr, (cqr->expires/HZ),
1882 cqr->retries);
1da177e4
LT		 1883 }
1884 }
1885}
1886
1887/*
1888 * Take a look at the first request on the ccw queue and check
1889 * if it needs to be started.
1890 */
8e09f215 1891static void __dasd_device_start_head(struct dasd_device *device)
1da177e4
LT		 1892{
1893 struct dasd_ccw_req *cqr;
1894 int rc;
1895
1896 if (list_empty(&device->ccw_queue))
1897 return;
8e09f215 1898 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
25ee4cf8
PO		 1899 if (cqr->status != DASD_CQR_QUEUED)
1900 return;
a4d26c6a
SW		 1901 /* when device is stopped, return request to previous layer
1902 * exception: only the disconnect or unresumed bits are set and the
1903 * cqr is a path verification request
1904 */
1905 if (device->stopped &&
1906 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1907 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1908 cqr->intrc = -EAGAIN;
8e09f215
SW		 1909 cqr->status = DASD_CQR_CLEARED;
1910 dasd_schedule_device_bh(device);
25ee4cf8 1911 return;
1c01b8a5 1912 }
25ee4cf8
PO		 1913
1914 rc = device->discipline->start_IO(cqr);
1915 if (rc == 0)
8e09f215 1916 dasd_device_set_timer(device, cqr->expires);
25ee4cf8 1917 else if (rc == -EACCES) {
8e09f215 1918 dasd_schedule_device_bh(device);
25ee4cf8
PO		 1919 } else
1920 /* Hmpf, try again in 1/2 sec */
8e09f215 1921 dasd_device_set_timer(device, 50);
8f61701b
HH		 1922}
1923
a4d26c6a
SW		 1924static void __dasd_device_check_path_events(struct dasd_device *device)
1925{
1926 int rc;
1927
1928 if (device->path_data.tbvpm) {
1929 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1930 DASD_UNRESUMED_PM))
1931 return;
1932 rc = device->discipline->verify_path(
1933 device, device->path_data.tbvpm);
1934 if (rc)
1935 dasd_device_set_timer(device, 50);
1936 else
1937 device->path_data.tbvpm = 0;
1938 }
1939};
1940
1da177e4 1941/*
8e09f215
SW		 1942 * Go through all request on the dasd_device request queue,
1943 * terminate them on the cdev if necessary, and return them to the
1944 * submitting layer via callback.
1945 * Note:
1946 * Make sure that all 'submitting layers' still exist when
1947 * this function is called!. In other words, when 'device' is a base
1948 * device then all block layer requests must have been removed before
1949 * via dasd_flush_block_queue.
1da177e4 1950 */
8e09f215 1951int dasd_flush_device_queue(struct dasd_device *device)
1da177e4 1952{
8e09f215
SW		 1953 struct dasd_ccw_req *cqr, *n;
1954 int rc;
1da177e4 1955 struct list_head flush_queue;
1da177e4
LT		 1956
1957 INIT_LIST_HEAD(&flush_queue);
1958 spin_lock_irq(get_ccwdev_lock(device->cdev));
8f61701b 1959 rc = 0;
8e09f215 1960 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
8f61701b
HH		 1961 /* Check status and move request to flush_queue */
1962 switch (cqr->status) {
1963 case DASD_CQR_IN_IO:
1964 rc = device->discipline->term_IO(cqr);
1965 if (rc) {
1966 /* unable to terminate requeust */
fc19f381
SH		 1967 dev_err(&device->cdev->dev,
1968 "Flushing the DASD request queue "
1969 "failed for request %p\n", cqr);
8f61701b
HH		 1970 /* stop flush processing */
1971 goto finished;
1972 }
1973 break;
1974 case DASD_CQR_QUEUED:
1aae0560 1975 cqr->stopclk = get_tod_clock();
8e09f215 1976 cqr->status = DASD_CQR_CLEARED;
8f61701b 1977 break;
8e09f215 1978 default: /* no need to modify the others */
8f61701b
HH		 1979 break;
1980 }
8e09f215 1981 list_move_tail(&cqr->devlist, &flush_queue);
8f61701b 1982 }
8f61701b
HH		 1983finished:
1984 spin_unlock_irq(get_ccwdev_lock(device->cdev));
8e09f215
SW		 1985 /*
1986 * After this point all requests must be in state CLEAR_PENDING,
1987 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
1988 * one of the others.
1989 */
1990 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1991 wait_event(dasd_flush_wq,
1992 (cqr->status != DASD_CQR_CLEAR_PENDING));
1993 /*
1994 * Now set each request back to TERMINATED, DONE or NEED_ERP
1995 * and call the callback function of flushed requests
1996 */
1997 __dasd_device_process_final_queue(device, &flush_queue);
8f61701b 1998 return rc;
1da177e4
LT		 1999}
2000
2001/*
2002 * Acquire the device lock and process queues for the device.
2003 */
8e09f215 2004static void dasd_device_tasklet(struct dasd_device *device)
1da177e4
LT		 2005{
2006 struct list_head final_queue;
1da177e4
LT		 2007
2008 atomic_set (&device->tasklet_scheduled, 0);
2009 INIT_LIST_HEAD(&final_queue);
2010 spin_lock_irq(get_ccwdev_lock(device->cdev));
2011 /* Check expire time of first request on the ccw queue. */
8e09f215
SW		 2012 __dasd_device_check_expire(device);
2013 /* find final requests on ccw queue */
2014 __dasd_device_process_ccw_queue(device, &final_queue);
a4d26c6a 2015 __dasd_device_check_path_events(device);
1da177e4
LT		 2016 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2017 /* Now call the callback function of requests with final status */
8e09f215
SW		 2018 __dasd_device_process_final_queue(device, &final_queue);
2019 spin_lock_irq(get_ccwdev_lock(device->cdev));
1da177e4 2020 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 2021 __dasd_device_start_head(device);
2022 spin_unlock_irq(get_ccwdev_lock(device->cdev));
4679e893
SH		 2023 if (waitqueue_active(&shutdown_waitq))
2024 wake_up(&shutdown_waitq);
1da177e4
LT		 2025 dasd_put_device(device);
2026}
2027
2028/*
2029 * Schedules a call to dasd_tasklet over the device tasklet.
2030 */
8e09f215 2031void dasd_schedule_device_bh(struct dasd_device *device)
1da177e4
LT		 2032{
2033 /* Protect against rescheduling. */
973bd993 2034 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1da177e4
LT		 2035 return;
2036 dasd_get_device(device);
2037 tasklet_hi_schedule(&device->tasklet);
2038}
2039
eb6e199b
SW		 2040void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2041{
2042 device->stopped |= bits;
2043}
2044EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2045
2046void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2047{
2048 device->stopped &= ~bits;
2049 if (!device->stopped)
2050 wake_up(&generic_waitq);
2051}
2052EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2053
1da177e4 2054/*
8e09f215
SW		 2055 * Queue a request to the head of the device ccw_queue.
2056 * Start the I/O if possible.
1da177e4 2057 */
8e09f215 2058void dasd_add_request_head(struct dasd_ccw_req *cqr)
1da177e4
LT		 2059{
2060 struct dasd_device *device;
2061 unsigned long flags;
2062
8e09f215 2063 device = cqr->startdev;
1da177e4 2064 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 2065 cqr->status = DASD_CQR_QUEUED;
2066 list_add(&cqr->devlist, &device->ccw_queue);
1da177e4 2067 /* let the bh start the request to keep them in order */
8e09f215 2068 dasd_schedule_device_bh(device);
1da177e4
LT		 2069 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2070}
2071
2072/*
8e09f215
SW		 2073 * Queue a request to the tail of the device ccw_queue.
2074 * Start the I/O if possible.
1da177e4 2075 */
8e09f215 2076void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1da177e4
LT		 2077{
2078 struct dasd_device *device;
2079 unsigned long flags;
2080
8e09f215 2081 device = cqr->startdev;
1da177e4 2082 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
8e09f215
SW		 2083 cqr->status = DASD_CQR_QUEUED;
2084 list_add_tail(&cqr->devlist, &device->ccw_queue);
1da177e4 2085 /* let the bh start the request to keep them in order */
8e09f215 2086 dasd_schedule_device_bh(device);
1da177e4
LT		 2087 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2088}
2089
2090/*
8e09f215 2091 * Wakeup helper for the 'sleep_on' functions.
1da177e4 2092 */
5915a873 2093void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1da177e4 2094{
1c1e093c
SW		 2095 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2096 cqr->callback_data = DASD_SLEEPON_END_TAG;
2097 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2098 wake_up(&generic_waitq);
1da177e4 2099}
5915a873 2100EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
1da177e4 2101
8e09f215 2102static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1da177e4
LT		 2103{
2104 struct dasd_device *device;
2105 int rc;
2106
8e09f215 2107 device = cqr->startdev;
1da177e4 2108 spin_lock_irq(get_ccwdev_lock(device->cdev));
1c1e093c 2109 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
1da177e4
LT		 2110 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2111 return rc;
2112}
2113
2114/*
eb6e199b 2115 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
1da177e4 2116 */
eb6e199b 2117static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1da177e4 2118{
1da177e4 2119 struct dasd_device *device;
eb6e199b 2120 dasd_erp_fn_t erp_fn;
138c014d 2121
eb6e199b
SW		 2122 if (cqr->status == DASD_CQR_FILLED)
2123 return 0;
8e09f215 2124 device = cqr->startdev;
eb6e199b
SW		 2125 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2126 if (cqr->status == DASD_CQR_TERMINATED) {
2127 device->discipline->handle_terminated_request(cqr);
2128 return 1;
2129 }
2130 if (cqr->status == DASD_CQR_NEED_ERP) {
2131 erp_fn = device->discipline->erp_action(cqr);
2132 erp_fn(cqr);
2133 return 1;
2134 }
2135 if (cqr->status == DASD_CQR_FAILED)
2136 dasd_log_sense(cqr, &cqr->irb);
2137 if (cqr->refers) {
2138 __dasd_process_erp(device, cqr);
2139 return 1;
2140 }
2141 }
2142 return 0;
2143}
138c014d 2144
eb6e199b
SW		 2145static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2146{
2147 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2148 if (cqr->refers) /* erp is not done yet */
2149 return 1;
2150 return ((cqr->status != DASD_CQR_DONE) &&
2151 (cqr->status != DASD_CQR_FAILED));
2152 } else
2153 return (cqr->status == DASD_CQR_FILLED);
2154}
138c014d 2155
eb6e199b
SW		 2156static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2157{
2158 struct dasd_device *device;
2159 int rc;
2160 struct list_head ccw_queue;
2161 struct dasd_ccw_req *cqr;
2162
2163 INIT_LIST_HEAD(&ccw_queue);
2164 maincqr->status = DASD_CQR_FILLED;
2165 device = maincqr->startdev;
2166 list_add(&maincqr->blocklist, &ccw_queue);
2167 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2168 cqr = list_first_entry(&ccw_queue,
2169 struct dasd_ccw_req, blocklist)) {
2170
2171 if (__dasd_sleep_on_erp(cqr))
2172 continue;
2173 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2174 continue;
5a27e60d
SW		 2175 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2176 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2177 cqr->status = DASD_CQR_FAILED;
2178 cqr->intrc = -EPERM;
2179 continue;
2180 }
eb6e199b
SW		 2181 /* Non-temporary stop condition will trigger fail fast */
2182 if (device->stopped & ~DASD_STOPPED_PENDING &&
2183 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2184 (!dasd_eer_enabled(device))) {
2185 cqr->status = DASD_CQR_FAILED;
12d7b107 2186 cqr->intrc = -EAGAIN;
eb6e199b
SW		 2187 continue;
2188 }
eb6e199b
SW		 2189 /* Don't try to start requests if device is stopped */
2190 if (interruptible) {
2191 rc = wait_event_interruptible(
2192 generic_waitq, !(device->stopped));
2193 if (rc == -ERESTARTSYS) {
2194 cqr->status = DASD_CQR_FAILED;
2195 maincqr->intrc = rc;
2196 continue;
2197 }
2198 } else
2199 wait_event(generic_waitq, !(device->stopped));
2200
5915a873
SH		 2201 if (!cqr->callback)
2202 cqr->callback = dasd_wakeup_cb;
2203
1c1e093c 2204 cqr->callback_data = DASD_SLEEPON_START_TAG;
eb6e199b
SW		 2205 dasd_add_request_tail(cqr);
2206 if (interruptible) {
2207 rc = wait_event_interruptible(
2208 generic_waitq, _wait_for_wakeup(cqr));
2209 if (rc == -ERESTARTSYS) {
2210 dasd_cancel_req(cqr);
2211 /* wait (non-interruptible) for final status */
2212 wait_event(generic_waitq,
2213 _wait_for_wakeup(cqr));
2214 cqr->status = DASD_CQR_FAILED;
2215 maincqr->intrc = rc;
2216 continue;
2217 }
2218 } else
2219 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2220 }
2221
1aae0560 2222 maincqr->endclk = get_tod_clock();
eb6e199b
SW		 2223 if ((maincqr->status != DASD_CQR_DONE) &&
2224 (maincqr->intrc != -ERESTARTSYS))
2225 dasd_log_sense(maincqr, &maincqr->irb);
2226 if (maincqr->status == DASD_CQR_DONE)
6cc7f168 2227 rc = 0;
eb6e199b
SW		 2228 else if (maincqr->intrc)
2229 rc = maincqr->intrc;
6cc7f168
SW		 2230 else
2231 rc = -EIO;
1da177e4
LT		 2232 return rc;
2233}
2234
d42e1712
SH		 2235static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2236{
2237 struct dasd_ccw_req *cqr;
2238
2239 list_for_each_entry(cqr, ccw_queue, blocklist) {
2240 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2241 return 0;
2242 }
2243
2244 return 1;
2245}
2246
2247static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2248{
2249 struct dasd_device *device;
2250 int rc;
2251 struct dasd_ccw_req *cqr, *n;
2252
2253retry:
2254 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2255 device = cqr->startdev;
2256 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2257 continue;
2258
2259 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2260 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2261 cqr->status = DASD_CQR_FAILED;
2262 cqr->intrc = -EPERM;
2263 continue;
2264 }
2265 /*Non-temporary stop condition will trigger fail fast*/
2266 if (device->stopped & ~DASD_STOPPED_PENDING &&
2267 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2268 !dasd_eer_enabled(device)) {
2269 cqr->status = DASD_CQR_FAILED;
2270 cqr->intrc = -EAGAIN;
2271 continue;
2272 }
2273
2274 /*Don't try to start requests if device is stopped*/
2275 if (interruptible) {
2276 rc = wait_event_interruptible(
2277 generic_waitq, !device->stopped);
2278 if (rc == -ERESTARTSYS) {
2279 cqr->status = DASD_CQR_FAILED;
2280 cqr->intrc = rc;
2281 continue;
2282 }
2283 } else
2284 wait_event(generic_waitq, !(device->stopped));
2285
2286 if (!cqr->callback)
2287 cqr->callback = dasd_wakeup_cb;
2288 cqr->callback_data = DASD_SLEEPON_START_TAG;
2289 dasd_add_request_tail(cqr);
2290 }
2291
2292 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2293
2294 rc = 0;
2295 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2296 if (__dasd_sleep_on_erp(cqr))
2297 rc = 1;
2298 }
2299 if (rc)
2300 goto retry;
2301
2302
2303 return 0;
2304}
2305
eb6e199b
SW		 2306/*
2307 * Queue a request to the tail of the device ccw_queue and wait for
2308 * it's completion.
2309 */
2310int dasd_sleep_on(struct dasd_ccw_req *cqr)
2311{
2312 return _dasd_sleep_on(cqr, 0);
2313}
2314
d42e1712
SH		 2315/*
2316 * Start requests from a ccw_queue and wait for their completion.
2317 */
2318int dasd_sleep_on_queue(struct list_head *ccw_queue)
2319{
2320 return _dasd_sleep_on_queue(ccw_queue, 0);
2321}
2322EXPORT_SYMBOL(dasd_sleep_on_queue);
2323
1da177e4 2324/*
8e09f215
SW		 2325 * Queue a request to the tail of the device ccw_queue and wait
2326 * interruptible for it's completion.
1da177e4 2327 */
8e09f215 2328int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1da177e4 2329{
eb6e199b 2330 return _dasd_sleep_on(cqr, 1);
1da177e4
LT		 2331}
2332
2333/*
2334 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2335 * for eckd devices) the currently running request has to be terminated
2336 * and be put back to status queued, before the special request is added
2337 * to the head of the queue. Then the special request is waited on normally.
2338 */
8e09f215 2339static inline int _dasd_term_running_cqr(struct dasd_device *device)
1da177e4
LT		 2340{
2341 struct dasd_ccw_req *cqr;
aade6c0d 2342 int rc;
1da177e4
LT		 2343
2344 if (list_empty(&device->ccw_queue))
2345 return 0;
8e09f215 2346 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
aade6c0d
SH		 2347 rc = device->discipline->term_IO(cqr);
2348 if (!rc)
2349 /*
2350 * CQR terminated because a more important request is pending.
2351 * Undo decreasing of retry counter because this is
2352 * not an error case.
2353 */
2354 cqr->retries++;
2355 return rc;
1da177e4
LT		 2356}
2357
8e09f215 2358int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1da177e4 2359{
1da177e4
LT		 2360 struct dasd_device *device;
2361 int rc;
138c014d 2362
8e09f215 2363 device = cqr->startdev;
5a27e60d
SW		 2364 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2365 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2366 cqr->status = DASD_CQR_FAILED;
2367 cqr->intrc = -EPERM;
2368 return -EIO;
2369 }
1da177e4
LT		 2370 spin_lock_irq(get_ccwdev_lock(device->cdev));
2371 rc = _dasd_term_running_cqr(device);
2372 if (rc) {
2373 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2374 return rc;
2375 }
1da177e4 2376 cqr->callback = dasd_wakeup_cb;
1c1e093c 2377 cqr->callback_data = DASD_SLEEPON_START_TAG;
1da177e4 2378 cqr->status = DASD_CQR_QUEUED;
214b8ffc
SH		 2379 /*
2380 * add new request as second
2381 * first the terminated cqr needs to be finished
2382 */
2383 list_add(&cqr->devlist, device->ccw_queue.next);
138c014d 2384
1da177e4 2385 /* let the bh start the request to keep them in order */
8e09f215 2386 dasd_schedule_device_bh(device);
138c014d 2387
1da177e4
LT		 2388 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2389
c80ee724 2390 wait_event(generic_waitq, _wait_for_wakeup(cqr));
138c014d 2391
6cc7f168
SW		 2392 if (cqr->status == DASD_CQR_DONE)
2393 rc = 0;
2394 else if (cqr->intrc)
2395 rc = cqr->intrc;
2396 else
2397 rc = -EIO;
1da177e4
LT		 2398 return rc;
2399}
2400
2401/*
2402 * Cancels a request that was started with dasd_sleep_on_req.
2403 * This is useful to timeout requests. The request will be
2404 * terminated if it is currently in i/o.
2405 * Returns 1 if the request has been terminated.
8e09f215
SW		 2406 * 0 if there was no need to terminate the request (not started yet)
2407 * negative error code if termination failed
2408 * Cancellation of a request is an asynchronous operation! The calling
2409 * function has to wait until the request is properly returned via callback.
1da177e4 2410 */
8e09f215 2411int dasd_cancel_req(struct dasd_ccw_req *cqr)
1da177e4 2412{
8e09f215 2413 struct dasd_device *device = cqr->startdev;
1da177e4
LT		 2414 unsigned long flags;
2415 int rc;
2416
2417 rc = 0;
2418 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2419 switch (cqr->status) {
2420 case DASD_CQR_QUEUED:
8e09f215
SW		 2421 /* request was not started - just set to cleared */
2422 cqr->status = DASD_CQR_CLEARED;
1da177e4
LT		 2423 break;
2424 case DASD_CQR_IN_IO:
2425 /* request in IO - terminate IO and release again */
8e09f215
SW		 2426 rc = device->discipline->term_IO(cqr);
2427 if (rc) {
fc19f381
SH		 2428 dev_err(&device->cdev->dev,
2429 "Cancelling request %p failed with rc=%d\n",
2430 cqr, rc);
8e09f215 2431 } else {
1aae0560 2432 cqr->stopclk = get_tod_clock();
8e09f215 2433 }
1da177e4 2434 break;
8e09f215 2435 default: /* already finished or clear pending - do nothing */
1da177e4 2436 break;
8e09f215
SW		 2437 }
2438 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2439 dasd_schedule_device_bh(device);
2440 return rc;
2441}
2442
2443
2444/*
2445 * SECTION: Operations of the dasd_block layer.
2446 */
2447
2448/*
2449 * Timeout function for dasd_block. This is used when the block layer
2450 * is waiting for something that may not come reliably, (e.g. a state
2451 * change interrupt)
2452 */
2453static void dasd_block_timeout(unsigned long ptr)
2454{
2455 unsigned long flags;
2456 struct dasd_block *block;
2457
2458 block = (struct dasd_block *) ptr;
2459 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2460 /* re-activate request queue */
eb6e199b 2461 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
8e09f215
SW		 2462 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2463 dasd_schedule_block_bh(block);
2464}
2465
2466/*
2467 * Setup timeout for a dasd_block in jiffies.
2468 */
2469void dasd_block_set_timer(struct dasd_block *block, int expires)
2470{
48cae885
SW		 2471 if (expires == 0)
2472 del_timer(&block->timer);
2473 else
2474 mod_timer(&block->timer, jiffies + expires);
8e09f215
SW		 2475}
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
SW		 2483}
2484
8e09f215
SW		 2485/*
2486 * Process finished error recovery ccw.
2487 */
eb6e199b
SW		 2488static void __dasd_process_erp(struct dasd_device *device,
2489 struct dasd_ccw_req *cqr)
8e09f215
SW		 2490{
2491 dasd_erp_fn_t erp_fn;
8e09f215
SW		 2492
2493 if (cqr->status == DASD_CQR_DONE)
2494 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2495 else
fc19f381 2496 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
8e09f215
SW		 2497 erp_fn = device->discipline->erp_postaction(cqr);
2498 erp_fn(cqr);
2499}
1da177e4 2500
8e09f215
SW		 2501/*
2502 * Fetch requests from the block device queue.
2503 */
2504static void __dasd_process_request_queue(struct dasd_block *block)
2505{
2506 struct request_queue *queue;
2507 struct request *req;
2508 struct dasd_ccw_req *cqr;
2509 struct dasd_device *basedev;
2510 unsigned long flags;
2511 queue = block->request_queue;
2512 basedev = block->base;
2513 /* No queue ? Then there is nothing to do. */
2514 if (queue == NULL)
2515 return;
2516
2517 /*
2518 * We requeue request from the block device queue to the ccw
2519 * queue only in two states. In state DASD_STATE_READY the
2520 * partition detection is done and we need to requeue requests
2521 * for that. State DASD_STATE_ONLINE is normal block device
2522 * operation.
2523 */
97f604b0
SW		 2524 if (basedev->state < DASD_STATE_READY) {
2525 while ((req = blk_fetch_request(block->request_queue)))
2526 __blk_end_request_all(req, -EIO);
8e09f215 2527 return;
97f604b0 2528 }
8e09f215 2529 /* Now we try to fetch requests from the request queue */
7eaceacc 2530 while ((req = blk_peek_request(queue))) {
8e09f215
SW		 2531 if (basedev->features & DASD_FEATURE_READONLY &&
2532 rq_data_dir(req) == WRITE) {
2533 DBF_DEV_EVENT(DBF_ERR, basedev,
2534 "Rejecting write request %p",
2535 req);
9934c8c0 2536 blk_start_request(req);
40cbbb78 2537 __blk_end_request_all(req, -EIO);
8e09f215
SW		 2538 continue;
2539 }
2540 cqr = basedev->discipline->build_cp(basedev, block, req);
2541 if (IS_ERR(cqr)) {
2542 if (PTR_ERR(cqr) == -EBUSY)
2543 break; /* normal end condition */
2544 if (PTR_ERR(cqr) == -ENOMEM)
2545 break; /* terminate request queue loop */
2546 if (PTR_ERR(cqr) == -EAGAIN) {
2547 /*
2548 * The current request cannot be build right
2549 * now, we have to try later. If this request
2550 * is the head-of-queue we stop the device
2551 * for 1/2 second.
2552 */
2553 if (!list_empty(&block->ccw_queue))
2554 break;
eb6e199b
SW		 2555 spin_lock_irqsave(
2556 get_ccwdev_lock(basedev->cdev), flags);
2557 dasd_device_set_stop_bits(basedev,
2558 DASD_STOPPED_PENDING);
2559 spin_unlock_irqrestore(
2560 get_ccwdev_lock(basedev->cdev), flags);
8e09f215
SW		 2561 dasd_block_set_timer(block, HZ/2);
2562 break;
2563 }
2564 DBF_DEV_EVENT(DBF_ERR, basedev,
2565 "CCW creation failed (rc=%ld) "
2566 "on request %p",
2567 PTR_ERR(cqr), req);
9934c8c0 2568 blk_start_request(req);
40cbbb78 2569 __blk_end_request_all(req, -EIO);
8e09f215
SW		 2570 continue;
2571 }
2572 /*
2573 * Note: callback is set to dasd_return_cqr_cb in
2574 * __dasd_block_start_head to cover erp requests as well
2575 */
2576 cqr->callback_data = (void *) req;
2577 cqr->status = DASD_CQR_FILLED;
9934c8c0 2578 blk_start_request(req);
8e09f215
SW		 2579 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2580 dasd_profile_start(block, cqr, req);
2581 }
2582}
2583
2584static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2585{
2586 struct request *req;
2587 int status;
4c4e2148 2588 int error = 0;
8e09f215
SW		 2589
2590 req = (struct request *) cqr->callback_data;
2591 dasd_profile_end(cqr->block, cqr, req);
fe6b8e76 2592 status = cqr->block->base->discipline->free_cp(cqr, req);
4c4e2148
KU		 2593 if (status <= 0)
2594 error = status ? status : -EIO;
40cbbb78 2595 __blk_end_request_all(req, error);
8e09f215
SW		 2596}
2597
2598/*
2599 * Process ccw request queue.
2600 */
2601static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2602 struct list_head *final_queue)
2603{
2604 struct list_head *l, *n;
2605 struct dasd_ccw_req *cqr;
2606 dasd_erp_fn_t erp_fn;
2607 unsigned long flags;
2608 struct dasd_device *base = block->base;
2609
2610restart:
2611 /* Process request with final status. */
2612 list_for_each_safe(l, n, &block->ccw_queue) {
2613 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2614 if (cqr->status != DASD_CQR_DONE &&
2615 cqr->status != DASD_CQR_FAILED &&
2616 cqr->status != DASD_CQR_NEED_ERP &&
2617 cqr->status != DASD_CQR_TERMINATED)
2618 continue;
2619
2620 if (cqr->status == DASD_CQR_TERMINATED) {
2621 base->discipline->handle_terminated_request(cqr);
2622 goto restart;
2623 }
2624
2625 /* Process requests that may be recovered */
2626 if (cqr->status == DASD_CQR_NEED_ERP) {
6c5f57c7 2627 erp_fn = base->discipline->erp_action(cqr);
6a5176c4
SH		 2628 if (IS_ERR(erp_fn(cqr)))
2629 continue;
8e09f215
SW		 2630 goto restart;
2631 }
2632
a9cffb22
SH		 2633 /* log sense for fatal error */
2634 if (cqr->status == DASD_CQR_FAILED) {
2635 dasd_log_sense(cqr, &cqr->irb);
2636 }
2637
8e09f215
SW		 2638 /* First of all call extended error reporting. */
2639 if (dasd_eer_enabled(base) &&
2640 cqr->status == DASD_CQR_FAILED) {
2641 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2642
2643 /* restart request */
2644 cqr->status = DASD_CQR_FILLED;
2645 cqr->retries = 255;
2646 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
eb6e199b 2647 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
8e09f215
SW		 2648 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2649 flags);
2650 goto restart;
2651 }
2652
2653 /* Process finished ERP request. */
2654 if (cqr->refers) {
eb6e199b 2655 __dasd_process_erp(base, cqr);
8e09f215
SW		 2656 goto restart;
2657 }
2658
2659 /* Rechain finished requests to final queue */
1aae0560 2660 cqr->endclk = get_tod_clock();
8e09f215
SW		 2661 list_move_tail(&cqr->blocklist, final_queue);
2662 }
2663}
2664
2665static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2666{
2667 dasd_schedule_block_bh(cqr->block);
2668}
2669
2670static void __dasd_block_start_head(struct dasd_block *block)
2671{
2672 struct dasd_ccw_req *cqr;
2673
2674 if (list_empty(&block->ccw_queue))
2675 return;
2676 /* We allways begin with the first requests on the queue, as some
2677 * of previously started requests have to be enqueued on a
2678 * dasd_device again for error recovery.
2679 */
2680 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2681 if (cqr->status != DASD_CQR_FILLED)
2682 continue;
5a27e60d
SW		 2683 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2684 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2685 cqr->status = DASD_CQR_FAILED;
2686 cqr->intrc = -EPERM;
2687 dasd_schedule_block_bh(block);
2688 continue;
2689 }
8e09f215
SW		 2690 /* Non-temporary stop condition will trigger fail fast */
2691 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2692 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2693 (!dasd_eer_enabled(block->base))) {
2694 cqr->status = DASD_CQR_FAILED;
2695 dasd_schedule_block_bh(block);
2696 continue;
2697 }
2698 /* Don't try to start requests if device is stopped */
2699 if (block->base->stopped)
2700 return;
2701
2702 /* just a fail safe check, should not happen */
2703 if (!cqr->startdev)
2704 cqr->startdev = block->base;
2705
2706 /* make sure that the requests we submit find their way back */
2707 cqr->callback = dasd_return_cqr_cb;
2708
2709 dasd_add_request_tail(cqr);
2710 }
2711}
2712
2713/*
2714 * Central dasd_block layer routine. Takes requests from the generic
2715 * block layer request queue, creates ccw requests, enqueues them on
2716 * a dasd_device and processes ccw requests that have been returned.
2717 */
2718static void dasd_block_tasklet(struct dasd_block *block)
2719{
2720 struct list_head final_queue;
2721 struct list_head *l, *n;
2722 struct dasd_ccw_req *cqr;
2723
2724 atomic_set(&block->tasklet_scheduled, 0);
2725 INIT_LIST_HEAD(&final_queue);
2726 spin_lock(&block->queue_lock);
2727 /* Finish off requests on ccw queue */
2728 __dasd_process_block_ccw_queue(block, &final_queue);
2729 spin_unlock(&block->queue_lock);
2730 /* Now call the callback function of requests with final status */
2731 spin_lock_irq(&block->request_queue_lock);
2732 list_for_each_safe(l, n, &final_queue) {
2733 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2734 list_del_init(&cqr->blocklist);
2735 __dasd_cleanup_cqr(cqr);
2736 }
2737 spin_lock(&block->queue_lock);
2738 /* Get new request from the block device request queue */
2739 __dasd_process_request_queue(block);
2740 /* Now check if the head of the ccw queue needs to be started. */
2741 __dasd_block_start_head(block);
2742 spin_unlock(&block->queue_lock);
2743 spin_unlock_irq(&block->request_queue_lock);
4679e893
SH		 2744 if (waitqueue_active(&shutdown_waitq))
2745 wake_up(&shutdown_waitq);
8e09f215
SW		 2746 dasd_put_device(block->base);
2747}
2748
2749static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2750{
2751 wake_up(&dasd_flush_wq);
2752}
2753
c5576876
SH		 2754/*
2755 * Requeue a request back to the block request queue
2756 * only works for block requests
2757 */
2758static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2759{
2760 struct dasd_block *block = cqr->block;
2761 struct request *req;
2762 unsigned long flags;
2763
2764 if (!block)
2765 return -EINVAL;
2766 spin_lock_irqsave(&block->queue_lock, flags);
2767 req = (struct request *) cqr->callback_data;
2768 blk_requeue_request(block->request_queue, req);
2769 spin_unlock_irqrestore(&block->queue_lock, flags);
2770
2771 return 0;
2772}
2773
8e09f215
SW		 2774/*
2775 * Go through all request on the dasd_block request queue, cancel them
2776 * on the respective dasd_device, and return them to the generic
2777 * block layer.
2778 */
2779static int dasd_flush_block_queue(struct dasd_block *block)
2780{
2781 struct dasd_ccw_req *cqr, *n;
2782 int rc, i;
2783 struct list_head flush_queue;
2784
2785 INIT_LIST_HEAD(&flush_queue);
2786 spin_lock_bh(&block->queue_lock);
2787 rc = 0;
2788restart:
2789 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2790 /* if this request currently owned by a dasd_device cancel it */
2791 if (cqr->status >= DASD_CQR_QUEUED)
2792 rc = dasd_cancel_req(cqr);
2793 if (rc < 0)
2794 break;
2795 /* Rechain request (including erp chain) so it won't be
2796 * touched by the dasd_block_tasklet anymore.
2797 * Replace the callback so we notice when the request
2798 * is returned from the dasd_device layer.
2799 */
2800 cqr->callback = _dasd_wake_block_flush_cb;
2801 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2802 list_move_tail(&cqr->blocklist, &flush_queue);
2803 if (i > 1)
2804 /* moved more than one request - need to restart */
2805 goto restart;
2806 }
2807 spin_unlock_bh(&block->queue_lock);
2808 /* Now call the callback function of flushed requests */
2809restart_cb:
2810 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2811 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2812 /* Process finished ERP request. */
2813 if (cqr->refers) {
0cd4bd47 2814 spin_lock_bh(&block->queue_lock);
eb6e199b 2815 __dasd_process_erp(block->base, cqr);
0cd4bd47 2816 spin_unlock_bh(&block->queue_lock);
8e09f215
SW		 2817 /* restart list_for_xx loop since dasd_process_erp
2818 * might remove multiple elements */
2819 goto restart_cb;
2820 }
2821 /* call the callback function */
0cd4bd47 2822 spin_lock_irq(&block->request_queue_lock);
1aae0560 2823 cqr->endclk = get_tod_clock();
8e09f215
SW		 2824 list_del_init(&cqr->blocklist);
2825 __dasd_cleanup_cqr(cqr);
0cd4bd47 2826 spin_unlock_irq(&block->request_queue_lock);
1da177e4 2827 }
1da177e4
LT		 2828 return rc;
2829}
2830
2831/*
8e09f215
SW		 2832 * Schedules a call to dasd_tasklet over the device tasklet.
2833 */
2834void dasd_schedule_block_bh(struct dasd_block *block)
2835{
2836 /* Protect against rescheduling. */
2837 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2838 return;
2839 /* life cycle of block is bound to it's base device */
2840 dasd_get_device(block->base);
2841 tasklet_hi_schedule(&block->tasklet);
2842}
2843
2844
2845/*
2846 * SECTION: external block device operations
2847 * (request queue handling, open, release, etc.)
1da177e4
LT		 2848 */
2849
2850/*
2851 * Dasd request queue function. Called from ll_rw_blk.c
2852 */
8e09f215 2853static void do_dasd_request(struct request_queue *queue)
1da177e4 2854{
8e09f215 2855 struct dasd_block *block;
1da177e4 2856
8e09f215
SW		 2857 block = queue->queuedata;
2858 spin_lock(&block->queue_lock);
1da177e4 2859 /* Get new request from the block device request queue */
8e09f215 2860 __dasd_process_request_queue(block);
1da177e4 2861 /* Now check if the head of the ccw queue needs to be started. */
8e09f215
SW		 2862 __dasd_block_start_head(block);
2863 spin_unlock(&block->queue_lock);
1da177e4
LT		 2864}
2865
2866/*
2867 * Allocate and initialize request queue and default I/O scheduler.
2868 */
8e09f215 2869static int dasd_alloc_queue(struct dasd_block *block)
1da177e4
LT		 2870{
2871 int rc;
2872
8e09f215
SW		 2873 block->request_queue = blk_init_queue(do_dasd_request,
2874 &block->request_queue_lock);
2875 if (block->request_queue == NULL)
1da177e4
LT		 2876 return -ENOMEM;
2877
8e09f215 2878 block->request_queue->queuedata = block;
1da177e4 2879
8e09f215 2880 elevator_exit(block->request_queue->elevator);
08a8a0c5 2881 block->request_queue->elevator = NULL;
8e09f215 2882 rc = elevator_init(block->request_queue, "deadline");
1da177e4 2883 if (rc) {
8e09f215 2884 blk_cleanup_queue(block->request_queue);
1da177e4
LT		 2885 return rc;
2886 }
2887 return 0;
2888}
2889
2890/*
2891 * Allocate and initialize request queue.
2892 */
8e09f215 2893static void dasd_setup_queue(struct dasd_block *block)
1da177e4
LT		 2894{
2895 int max;
2896
e4dbb0f2
SH		 2897 if (block->base->features & DASD_FEATURE_USERAW) {
2898 /*
2899 * the max_blocks value for raw_track access is 256
2900 * it is higher than the native ECKD value because we
2901 * only need one ccw per track
2902 * so the max_hw_sectors are
2903 * 2048 x 512B = 1024kB = 16 tracks
2904 */
2905 max = 2048;
2906 } else {
2907 max = block->base->discipline->max_blocks << block->s2b_shift;
2908 }
2909 blk_queue_logical_block_size(block->request_queue,
2910 block->bp_block);
086fa5ff 2911 blk_queue_max_hw_sectors(block->request_queue, max);
8a78362c 2912 blk_queue_max_segments(block->request_queue, -1L);
f3eb5384
SW		 2913 /* with page sized segments we can translate each segement into
2914 * one idaw/tidaw
2915 */
2916 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2917 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
1da177e4
LT		 2918}
2919
2920/*
2921 * Deactivate and free request queue.
2922 */
8e09f215 2923static void dasd_free_queue(struct dasd_block *block)
1da177e4 2924{
8e09f215
SW		 2925 if (block->request_queue) {
2926 blk_cleanup_queue(block->request_queue);
2927 block->request_queue = NULL;
1da177e4
LT		 2928 }
2929}
2930
2931/*
2932 * Flush request on the request queue.
2933 */
8e09f215 2934static void dasd_flush_request_queue(struct dasd_block *block)
1da177e4
LT		 2935{
2936 struct request *req;
2937
8e09f215 2938 if (!block->request_queue)
1da177e4 2939 return;
138c014d 2940
8e09f215 2941 spin_lock_irq(&block->request_queue_lock);
9934c8c0 2942 while ((req = blk_fetch_request(block->request_queue)))
40cbbb78 2943 __blk_end_request_all(req, -EIO);
8e09f215 2944 spin_unlock_irq(&block->request_queue_lock);
1da177e4
LT		 2945}
2946
57a7c0bc 2947static int dasd_open(struct block_device *bdev, fmode_t mode)
1da177e4 2948{
9eb25122 2949 struct dasd_device *base;
1da177e4
LT		 2950 int rc;
2951
65f8da47
SW		 2952 base = dasd_device_from_gendisk(bdev->bd_disk);
2953 if (!base)
9eb25122
SH		 2954 return -ENODEV;
2955
65f8da47 2956 atomic_inc(&base->block->open_count);
8e09f215 2957 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
1da177e4
LT		 2958 rc = -ENODEV;
2959 goto unlock;
2960 }
2961
8e09f215 2962 if (!try_module_get(base->discipline->owner)) {
1da177e4
LT		 2963 rc = -EINVAL;
2964 goto unlock;
2965 }
2966
2967 if (dasd_probeonly) {
fc19f381
SH		 2968 dev_info(&base->cdev->dev,
2969 "Accessing the DASD failed because it is in "
2970 "probeonly mode\n");
1da177e4
LT		 2971 rc = -EPERM;
2972 goto out;
2973 }
2974
8e09f215
SW		 2975 if (base->state <= DASD_STATE_BASIC) {
2976 DBF_DEV_EVENT(DBF_ERR, base, " %s",
1da177e4
LT		 2977 " Cannot open unrecognized device");
2978 rc = -ENODEV;
2979 goto out;
2980 }
2981
33b62a30
SW		 2982 if ((mode & FMODE_WRITE) &&
2983 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2984 (base->features & DASD_FEATURE_READONLY))) {
2985 rc = -EROFS;
2986 goto out;
2987 }
2988
65f8da47 2989 dasd_put_device(base);
1da177e4
LT		 2990 return 0;
2991
2992out:
8e09f215 2993 module_put(base->discipline->owner);
1da177e4 2994unlock:
65f8da47
SW		 2995 atomic_dec(&base->block->open_count);
2996 dasd_put_device(base);
1da177e4
LT		 2997 return rc;
2998}
2999
db2a144b 3000static void dasd_release(struct gendisk *disk, fmode_t mode)
1da177e4 3001{
db2a144b
AV		 3002 struct dasd_device *base = dasd_device_from_gendisk(disk);
3003 if (base) {
3004 atomic_dec(&base->block->open_count);
3005 module_put(base->discipline->owner);
3006 dasd_put_device(base);
3007 }
1da177e4
LT		 3008}
3009
a885c8c4
CH		 3010/*
3011 * Return disk geometry.
3012 */
8e09f215 3013static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
a885c8c4 3014{
8e09f215 3015 struct dasd_device *base;
a885c8c4 3016
65f8da47
SW		 3017 base = dasd_device_from_gendisk(bdev->bd_disk);
3018 if (!base)
a885c8c4
CH		 3019 return -ENODEV;
3020
8e09f215 3021 if (!base->discipline ||
65f8da47
SW		 3022 !base->discipline->fill_geometry) {
3023 dasd_put_device(base);
a885c8c4 3024 return -EINVAL;
65f8da47
SW		 3025 }
3026 base->discipline->fill_geometry(base->block, geo);
3027 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3028 dasd_put_device(base);
a885c8c4
CH		 3029 return 0;
3030}
3031
83d5cde4 3032const struct block_device_operations
1da177e4
LT		 3033dasd_device_operations = {
3034 .owner = THIS_MODULE,
57a7c0bc
AV		 3035 .open = dasd_open,
3036 .release = dasd_release,
0000d031
HC		 3037 .ioctl = dasd_ioctl,
3038 .compat_ioctl = dasd_ioctl,
a885c8c4 3039 .getgeo = dasd_getgeo,
1da177e4
LT		 3040};
3041
8e09f215
SW		 3042/*******************************************************************************
3043 * end of block device operations
3044 */
1da177e4
LT		 3045
3046static void
3047dasd_exit(void)
3048{
3049#ifdef CONFIG_PROC_FS
3050 dasd_proc_exit();
3051#endif
20c64468 3052 dasd_eer_exit();
6bb0e010
HH		 3053 if (dasd_page_cache != NULL) {
3054 kmem_cache_destroy(dasd_page_cache);
3055 dasd_page_cache = NULL;
3056 }
1da177e4
LT		 3057 dasd_gendisk_exit();
3058 dasd_devmap_exit();
1da177e4
LT		 3059 if (dasd_debug_area != NULL) {
3060 debug_unregister(dasd_debug_area);
3061 dasd_debug_area = NULL;
3062 }
4fa52aa7 3063 dasd_statistics_removeroot();
1da177e4
LT		 3064}
3065
3066/*
3067 * SECTION: common functions for ccw_driver use
3068 */
3069
33b62a30
SW		 3070/*
3071 * Is the device read-only?
3072 * Note that this function does not report the setting of the
3073 * readonly device attribute, but how it is configured in z/VM.
3074 */
3075int dasd_device_is_ro(struct dasd_device *device)
3076{
3077 struct ccw_dev_id dev_id;
3078 struct diag210 diag_data;
3079 int rc;
3080
3081 if (!MACHINE_IS_VM)
3082 return 0;
3083 ccw_device_get_id(device->cdev, &dev_id);
3084 memset(&diag_data, 0, sizeof(diag_data));
3085 diag_data.vrdcdvno = dev_id.devno;
3086 diag_data.vrdclen = sizeof(diag_data);
3087 rc = diag210(&diag_data);
3088 if (rc == 0 || rc == 2) {
3089 return diag_data.vrdcvfla & 0x80;
3090 } else {
3091 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3092 dev_id.devno, rc);
3093 return 0;
3094 }
3095}
3096EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3097
f3445a1a
CH		 3098static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3099{
3100 struct ccw_device *cdev = data;
3101 int ret;
3102
3103 ret = ccw_device_set_online(cdev);
3104 if (ret)
3105 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
3106 dev_name(&cdev->dev), ret);
f3445a1a
CH		 3107}
3108
1c01b8a5
HH		 3109/*
3110 * Initial attempt at a probe function. this can be simplified once
3111 * the other detection code is gone.
3112 */
8e09f215
SW		 3113int dasd_generic_probe(struct ccw_device *cdev,
3114 struct dasd_discipline *discipline)
1da177e4
LT		 3115{
3116 int ret;
3117
3118 ret = dasd_add_sysfs_files(cdev);
3119 if (ret) {
b8ed5dd5
SH		 3120 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3121 "dasd_generic_probe: could not add "
3122 "sysfs entries");
40545573 3123 return ret;
1da177e4 3124 }
40545573 3125 cdev->handler = &dasd_int_handler;
1da177e4 3126
40545573
HH		 3127 /*
3128 * Automatically online either all dasd devices (dasd_autodetect)
3129 * or all devices specified with dasd= parameters during
3130 * initial probe.
3131 */
3132 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2a0217d5 3133 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
f3445a1a 3134 async_schedule(dasd_generic_auto_online, cdev);
de3e0da1 3135 return 0;
1da177e4
LT		 3136}
3137
1c01b8a5
HH		 3138/*
3139 * This will one day be called from a global not_oper handler.
3140 * It is also used by driver_unregister during module unload.
3141 */
8e09f215 3142void dasd_generic_remove(struct ccw_device *cdev)
1da177e4
LT		 3143{
3144 struct dasd_device *device;
8e09f215 3145 struct dasd_block *block;
1da177e4 3146
59afda78
HH		 3147 cdev->handler = NULL;
3148
1da177e4 3149 device = dasd_device_from_cdev(cdev);
be4904e5
SW		 3150 if (IS_ERR(device)) {
3151 dasd_remove_sysfs_files(cdev);
1da177e4 3152 return;
be4904e5 3153 }
d07dc5d8
SH		 3154 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3155 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1da177e4
LT		 3156 /* Already doing offline processing */
3157 dasd_put_device(device);
be4904e5 3158 dasd_remove_sysfs_files(cdev);
1da177e4
LT		 3159 return;
3160 }
3161 /*
3162 * This device is removed unconditionally. Set offline
3163 * flag to prevent dasd_open from opening it while it is
3164 * no quite down yet.
3165 */
3166 dasd_set_target_state(device, DASD_STATE_NEW);
3167 /* dasd_delete_device destroys the device reference. */
8e09f215 3168 block = device->block;
1da177e4 3169 dasd_delete_device(device);
8e09f215
SW		 3170 /*
3171 * life cycle of block is bound to device, so delete it after
3172 * device was safely removed
3173 */
3174 if (block)
3175 dasd_free_block(block);
d07dc5d8
SH		 3176
3177 dasd_remove_sysfs_files(cdev);
1da177e4
LT		 3178}
3179
1c01b8a5
HH		 3180/*
3181 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
1da177e4 3182 * the device is detected for the first time and is supposed to be used
1c01b8a5
HH		 3183 * or the user has started activation through sysfs.
3184 */
8e09f215
SW		 3185int dasd_generic_set_online(struct ccw_device *cdev,
3186 struct dasd_discipline *base_discipline)
1da177e4 3187{
aa88861f 3188 struct dasd_discipline *discipline;
1da177e4 3189 struct dasd_device *device;
c6eb7b77 3190 int rc;
f24acd45 3191
40545573
HH		 3192 /* first online clears initial online feature flag */
3193 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
1da177e4
LT		 3194 device = dasd_create_device(cdev);
3195 if (IS_ERR(device))
3196 return PTR_ERR(device);
3197
aa88861f 3198 discipline = base_discipline;
c6eb7b77 3199 if (device->features & DASD_FEATURE_USEDIAG) {
1da177e4 3200 if (!dasd_diag_discipline_pointer) {
fc19f381
SH		 3201 pr_warning("%s Setting the DASD online failed because "
3202 "of missing DIAG discipline\n",
3203 dev_name(&cdev->dev));
1da177e4
LT		 3204 dasd_delete_device(device);
3205 return -ENODEV;
3206 }
3207 discipline = dasd_diag_discipline_pointer;
3208 }
aa88861f
PO		 3209 if (!try_module_get(base_discipline->owner)) {
3210 dasd_delete_device(device);
3211 return -EINVAL;
3212 }
3213 if (!try_module_get(discipline->owner)) {
3214 module_put(base_discipline->owner);
3215 dasd_delete_device(device);
3216 return -EINVAL;
3217 }
3218 device->base_discipline = base_discipline;
1da177e4
LT		 3219 device->discipline = discipline;
3220
8e09f215 3221 /* check_device will allocate block device if necessary */
1da177e4
LT		 3222 rc = discipline->check_device(device);
3223 if (rc) {
fc19f381
SH		 3224 pr_warning("%s Setting the DASD online with discipline %s "
3225 "failed with rc=%i\n",
3226 dev_name(&cdev->dev), discipline->name, rc);
aa88861f
PO		 3227 module_put(discipline->owner);
3228 module_put(base_discipline->owner);
1da177e4
LT		 3229 dasd_delete_device(device);
3230 return rc;
3231 }
3232
3233 dasd_set_target_state(device, DASD_STATE_ONLINE);
3234 if (device->state <= DASD_STATE_KNOWN) {
fc19f381
SH		 3235 pr_warning("%s Setting the DASD online failed because of a "
3236 "missing discipline\n", dev_name(&cdev->dev));
1da177e4
LT		 3237 rc = -ENODEV;
3238 dasd_set_target_state(device, DASD_STATE_NEW);
8e09f215
SW		 3239 if (device->block)
3240 dasd_free_block(device->block);
1da177e4
LT		 3241 dasd_delete_device(device);
3242 } else
3243 pr_debug("dasd_generic device %s found\n",
2a0217d5 3244 dev_name(&cdev->dev));
589c74d5
SH		 3245
3246 wait_event(dasd_init_waitq, _wait_for_device(device));
3247
1da177e4 3248 dasd_put_device(device);
1da177e4
LT		 3249 return rc;
3250}
3251
8e09f215 3252int dasd_generic_set_offline(struct ccw_device *cdev)
1da177e4
LT		 3253{
3254 struct dasd_device *device;
8e09f215 3255 struct dasd_block *block;
d07dc5d8 3256 int max_count, open_count, rc;
1da177e4 3257
d07dc5d8 3258 rc = 0;
1da177e4
LT		 3259 device = dasd_device_from_cdev(cdev);
3260 if (IS_ERR(device))
3261 return PTR_ERR(device);
d07dc5d8 3262
1da177e4
LT		 3263 /*
3264 * We must make sure that this device is currently not in use.
3265 * The open_count is increased for every opener, that includes
3266 * the blkdev_get in dasd_scan_partitions. We are only interested
3267 * in the other openers.
3268 */
8e09f215 3269 if (device->block) {
a806170e
HC		 3270 max_count = device->block->bdev ? 0 : -1;
3271 open_count = atomic_read(&device->block->open_count);
8e09f215
SW		 3272 if (open_count > max_count) {
3273 if (open_count > 0)
fc19f381
SH		 3274 pr_warning("%s: The DASD cannot be set offline "
3275 "with open count %i\n",
3276 dev_name(&cdev->dev), open_count);
8e09f215 3277 else
fc19f381
SH		 3278 pr_warning("%s: The DASD cannot be set offline "
3279 "while it is in use\n",
3280 dev_name(&cdev->dev));
8e09f215
SW		 3281 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3282 dasd_put_device(device);
3283 return -EBUSY;
3284 }
1da177e4 3285 }
d07dc5d8
SH		 3286
3287 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3288 /*
3289 * safe offline allready running
3290 * could only be called by normal offline so safe_offline flag
3291 * needs to be removed to run normal offline and kill all I/O
3292 */
3293 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3294 /* Already doing normal offline processing */
3295 dasd_put_device(device);
3296 return -EBUSY;
3297 } else
3298 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3299
3300 } else
3301 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3302 /* Already doing offline processing */
3303 dasd_put_device(device);
3304 return -EBUSY;
3305 }
3306
3307 /*
3308 * if safe_offline called set safe_offline_running flag and
3309 * clear safe_offline so that a call to normal offline
3310 * can overrun safe_offline processing
3311 */
3312 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3313 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3314 /*
3315 * If we want to set the device safe offline all IO operations
3316 * should be finished before continuing the offline process
3317 * so sync bdev first and then wait for our queues to become
3318 * empty
3319 */
3320 /* sync blockdev and partitions */
3321 rc = fsync_bdev(device->block->bdev);
3322 if (rc != 0)
3323 goto interrupted;
3324
3325 /* schedule device tasklet and wait for completion */
3326 dasd_schedule_device_bh(device);
3327 rc = wait_event_interruptible(shutdown_waitq,
3328 _wait_for_empty_queues(device));
3329 if (rc != 0)
3330 goto interrupted;
3331 }
3332
3333 set_bit(DASD_FLAG_OFFLINE, &device->flags);
1da177e4
LT		 3334 dasd_set_target_state(device, DASD_STATE_NEW);
3335 /* dasd_delete_device destroys the device reference. */
8e09f215 3336 block = device->block;
1da177e4 3337 dasd_delete_device(device);
8e09f215
SW		 3338 /*
3339 * life cycle of block is bound to device, so delete it after
3340 * device was safely removed
3341 */
3342 if (block)
3343 dasd_free_block(block);
1da177e4 3344 return 0;
d07dc5d8
SH		 3345
3346interrupted:
3347 /* interrupted by signal */
3348 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3349 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3350 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3351 dasd_put_device(device);
3352 return rc;
1da177e4
LT		 3353}
3354
a4d26c6a
SW		 3355int dasd_generic_last_path_gone(struct dasd_device *device)
3356{
3357 struct dasd_ccw_req *cqr;
3358
3359 dev_warn(&device->cdev->dev, "No operational channel path is left "
3360 "for the device\n");
3361 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3362 /* First of all call extended error reporting. */
3363 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3364
3365 if (device->state < DASD_STATE_BASIC)
3366 return 0;
3367 /* Device is active. We want to keep it. */
3368 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3369 if ((cqr->status == DASD_CQR_IN_IO) ||
3370 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3371 cqr->status = DASD_CQR_QUEUED;
3372 cqr->retries++;
3373 }
3374 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3375 dasd_device_clear_timer(device);
3376 dasd_schedule_device_bh(device);
3377 return 1;
3378}
3379EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3380
3381int dasd_generic_path_operational(struct dasd_device *device)
3382{
3383 dev_info(&device->cdev->dev, "A channel path to the device has become "
3384 "operational\n");
3385 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3386 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3387 if (device->stopped & DASD_UNRESUMED_PM) {
3388 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3389 dasd_restore_device(device);
3390 return 1;
3391 }
3392 dasd_schedule_device_bh(device);
3393 if (device->block)
3394 dasd_schedule_block_bh(device->block);
3395 return 1;
3396}
3397EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3398
8e09f215 3399int dasd_generic_notify(struct ccw_device *cdev, int event)
1da177e4
LT		 3400{
3401 struct dasd_device *device;
1da177e4
LT		 3402 int ret;
3403
91c36919 3404 device = dasd_device_from_cdev_locked(cdev);
1da177e4
LT		 3405 if (IS_ERR(device))
3406 return 0;
1da177e4
LT		 3407 ret = 0;
3408 switch (event) {
3409 case CIO_GONE:
47593bfa 3410 case CIO_BOXED:
1da177e4 3411 case CIO_NO_PATH:
a4d26c6a
SW		 3412 device->path_data.opm = 0;
3413 device->path_data.ppm = 0;
3414 device->path_data.npm = 0;
3415 ret = dasd_generic_last_path_gone(device);
1da177e4
LT		 3416 break;
3417 case CIO_OPER:
1da177e4 3418 ret = 1;
a4d26c6a
SW		 3419 if (device->path_data.opm)
3420 ret = dasd_generic_path_operational(device);
1da177e4
LT		 3421 break;
3422 }
1da177e4
LT		 3423 dasd_put_device(device);
3424 return ret;
3425}
3426
a4d26c6a
SW		 3427void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3428{
3429 int chp;
3430 __u8 oldopm, eventlpm;
3431 struct dasd_device *device;
3432
3433 device = dasd_device_from_cdev_locked(cdev);
3434 if (IS_ERR(device))
3435 return;
3436 for (chp = 0; chp < 8; chp++) {
3437 eventlpm = 0x80 >> chp;
3438 if (path_event[chp] & PE_PATH_GONE) {
3439 oldopm = device->path_data.opm;
3440 device->path_data.opm &= ~eventlpm;
3441 device->path_data.ppm &= ~eventlpm;
3442 device->path_data.npm &= ~eventlpm;
8b811bae
SW		 3443 if (oldopm && !device->path_data.opm) {
3444 dev_warn(&device->cdev->dev,
3445 "No verified channel paths remain "
3446 "for the device\n");
3447 DBF_DEV_EVENT(DBF_WARNING, device,
3448 "%s", "last verified path gone");
3449 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3450 dasd_device_set_stop_bits(device,
3451 DASD_STOPPED_DC_WAIT);
3452 }
a4d26c6a
SW		 3453 }
3454 if (path_event[chp] & PE_PATH_AVAILABLE) {
3455 device->path_data.opm &= ~eventlpm;
3456 device->path_data.ppm &= ~eventlpm;
3457 device->path_data.npm &= ~eventlpm;
3458 device->path_data.tbvpm |= eventlpm;
3459 dasd_schedule_device_bh(device);
3460 }
f1633031 3461 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
12d7b107
SH		 3462 if (!(device->path_data.opm & eventlpm) &&
3463 !(device->path_data.tbvpm & eventlpm)) {
3464 /*
3465 * we can not establish a pathgroup on an
3466 * unavailable path, so trigger a path
3467 * verification first
3468 */
3469 device->path_data.tbvpm |= eventlpm;
3470 dasd_schedule_device_bh(device);
3471 }
f1633031
SH		 3472 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3473 "Pathgroup re-established\n");
3474 if (device->discipline->kick_validate)
3475 device->discipline->kick_validate(device);
3476 }
a4d26c6a
SW		 3477 }
3478 dasd_put_device(device);
3479}
3480EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3481
3482int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3483{
3484 if (!device->path_data.opm && lpm) {
3485 device->path_data.opm = lpm;
3486 dasd_generic_path_operational(device);
3487 } else
3488 device->path_data.opm |= lpm;
3489 return 0;
3490}
3491EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3492
3493
d41dd122
SH		 3494int dasd_generic_pm_freeze(struct ccw_device *cdev)
3495{
c5576876
SH		 3496 struct dasd_device *device = dasd_device_from_cdev(cdev);
3497 struct list_head freeze_queue;
d41dd122 3498 struct dasd_ccw_req *cqr, *n;
c5576876 3499 struct dasd_ccw_req *refers;
d41dd122 3500 int rc;
d41dd122
SH		 3501
3502 if (IS_ERR(device))
3503 return PTR_ERR(device);
6f272b9c 3504
c8d1c0ff
SH		 3505 /* mark device as suspended */
3506 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3507
6f272b9c
SH		 3508 if (device->discipline->freeze)
3509 rc = device->discipline->freeze(device);
3510
d41dd122 3511 /* disallow new I/O */
eb6e199b 3512 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
c5576876
SH		 3513
3514 /* clear active requests and requeue them to block layer if possible */
d41dd122
SH		 3515 INIT_LIST_HEAD(&freeze_queue);
3516 spin_lock_irq(get_ccwdev_lock(cdev));
3517 rc = 0;
3518 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3519 /* Check status and move request to flush_queue */
3520 if (cqr->status == DASD_CQR_IN_IO) {
3521 rc = device->discipline->term_IO(cqr);
3522 if (rc) {
3523 /* unable to terminate requeust */
3524 dev_err(&device->cdev->dev,
3525 "Unable to terminate request %p "
3526 "on suspend\n", cqr);
3527 spin_unlock_irq(get_ccwdev_lock(cdev));
3528 dasd_put_device(device);
3529 return rc;
3530 }
3531 }
3532 list_move_tail(&cqr->devlist, &freeze_queue);
3533 }
d41dd122
SH		 3534 spin_unlock_irq(get_ccwdev_lock(cdev));
3535
3536 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3537 wait_event(dasd_flush_wq,
3538 (cqr->status != DASD_CQR_CLEAR_PENDING));
3539 if (cqr->status == DASD_CQR_CLEARED)
3540 cqr->status = DASD_CQR_QUEUED;
c5576876
SH		 3541
3542 /* requeue requests to blocklayer will only work for
3543 block device requests */
3544 if (_dasd_requeue_request(cqr))
3545 continue;
3546
3547 /* remove requests from device and block queue */
3548 list_del_init(&cqr->devlist);
3549 while (cqr->refers != NULL) {
3550 refers = cqr->refers;
3551 /* remove the request from the block queue */
3552 list_del(&cqr->blocklist);
3553 /* free the finished erp request */
3554 dasd_free_erp_request(cqr, cqr->memdev);
3555 cqr = refers;
3556 }
3557 if (cqr->block)
3558 list_del_init(&cqr->blocklist);
3559 cqr->block->base->discipline->free_cp(
3560 cqr, (struct request *) cqr->callback_data);
d41dd122 3561 }
d41dd122 3562
c5576876
SH		 3563 /*
3564 * if requests remain then they are internal request
3565 * and go back to the device queue
3566 */
3567 if (!list_empty(&freeze_queue)) {
3568 /* move freeze_queue to start of the ccw_queue */
3569 spin_lock_irq(get_ccwdev_lock(cdev));
3570 list_splice_tail(&freeze_queue, &device->ccw_queue);
3571 spin_unlock_irq(get_ccwdev_lock(cdev));
3572 }
d41dd122
SH		 3573 dasd_put_device(device);
3574 return rc;
3575}
3576EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3577
3578int dasd_generic_restore_device(struct ccw_device *cdev)
3579{
3580 struct dasd_device *device = dasd_device_from_cdev(cdev);
3581 int rc = 0;
3582
3583 if (IS_ERR(device))
3584 return PTR_ERR(device);
3585
e6125fba 3586 /* allow new IO again */
eb6e199b
SW		 3587 dasd_device_remove_stop_bits(device,
3588 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
e6125fba 3589
d41dd122 3590 dasd_schedule_device_bh(device);
d41dd122 3591
eb6e199b
SW		 3592 /*
3593 * call discipline restore function
3594 * if device is stopped do nothing e.g. for disconnected devices
3595 */
3596 if (device->discipline->restore && !(device->stopped))
d41dd122 3597 rc = device->discipline->restore(device);
eb6e199b 3598 if (rc || device->stopped)
e6125fba
SH		 3599 /*
3600 * if the resume failed for the DASD we put it in
3601 * an UNRESUMED stop state
3602 */
3603 device->stopped |= DASD_UNRESUMED_PM;
d41dd122 3604
6fca97a9
SH		 3605 if (device->block)
3606 dasd_schedule_block_bh(device->block);
3607
c8d1c0ff 3608 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
d41dd122 3609 dasd_put_device(device);
e6125fba 3610 return 0;
d41dd122
SH		 3611}
3612EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3613
763968e2
HC		 3614static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3615 void *rdc_buffer,
3616 int rdc_buffer_size,
68b781fe 3617 int magic)
17283b56
CH		 3618{
3619 struct dasd_ccw_req *cqr;
3620 struct ccw1 *ccw;
d9fa9441 3621 unsigned long *idaw;
17283b56
CH		 3622
3623 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3624
3625 if (IS_ERR(cqr)) {
fc19f381
SH		 3626 /* internal error 13 - Allocating the RDC request failed*/
3627 dev_err(&device->cdev->dev,
3628 "An error occurred in the DASD device driver, "
3629 "reason=%s\n", "13");
17283b56
CH		 3630 return cqr;
3631 }
3632
3633 ccw = cqr->cpaddr;
3634 ccw->cmd_code = CCW_CMD_RDC;
d9fa9441
SH		 3635 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3636 idaw = (unsigned long *) (cqr->data);
3637 ccw->cda = (__u32)(addr_t) idaw;
3638 ccw->flags = CCW_FLAG_IDA;
3639 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3640 } else {
3641 ccw->cda = (__u32)(addr_t) rdc_buffer;
3642 ccw->flags = 0;
3643 }
17283b56 3644
d9fa9441 3645 ccw->count = rdc_buffer_size;
8e09f215
SW		 3646 cqr->startdev = device;
3647 cqr->memdev = device;
17283b56 3648 cqr->expires = 10*HZ;
eb6e199b 3649 cqr->retries = 256;
1aae0560 3650 cqr->buildclk = get_tod_clock();
17283b56
CH		 3651 cqr->status = DASD_CQR_FILLED;
3652 return cqr;
3653}
3654
3655
68b781fe 3656int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
92636b15 3657 void *rdc_buffer, int rdc_buffer_size)
17283b56
CH		 3658{
3659 int ret;
3660 struct dasd_ccw_req *cqr;
3661
92636b15 3662 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
17283b56
CH		 3663 magic);
3664 if (IS_ERR(cqr))
3665 return PTR_ERR(cqr);
3666
3667 ret = dasd_sleep_on(cqr);
8e09f215 3668 dasd_sfree_request(cqr, cqr->memdev);
17283b56
CH		 3669 return ret;
3670}
aaff0f64 3671EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
20c64468 3672
f3eb5384
SW		 3673/*
3674 * In command mode and transport mode we need to look for sense
3675 * data in different places. The sense data itself is allways
3676 * an array of 32 bytes, so we can unify the sense data access
3677 * for both modes.
3678 */
3679char *dasd_get_sense(struct irb *irb)
3680{
3681 struct tsb *tsb = NULL;
3682 char *sense = NULL;
3683
3684 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3685 if (irb->scsw.tm.tcw)
3686 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3687 irb->scsw.tm.tcw);
3688 if (tsb && tsb->length == 64 && tsb->flags)
3689 switch (tsb->flags & 0x07) {
3690 case 1: /* tsa_iostat */
3691 sense = tsb->tsa.iostat.sense;
3692 break;
3693 case 2: /* tsa_ddpc */
3694 sense = tsb->tsa.ddpc.sense;
3695 break;
3696 default:
3697 /* currently we don't use interrogate data */
3698 break;
3699 }
3700 } else if (irb->esw.esw0.erw.cons) {
3701 sense = irb->ecw;
3702 }
3703 return sense;
3704}
3705EXPORT_SYMBOL_GPL(dasd_get_sense);
3706
4679e893
SH		 3707void dasd_generic_shutdown(struct ccw_device *cdev)
3708{
3709 struct dasd_device *device;
3710
3711 device = dasd_device_from_cdev(cdev);
3712 if (IS_ERR(device))
3713 return;
3714
3715 if (device->block)
3716 dasd_schedule_block_bh(device->block);
3717
3718 dasd_schedule_device_bh(device);
3719
3720 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3721}
3722EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3723
8e09f215 3724static int __init dasd_init(void)
1da177e4
LT		 3725{
3726 int rc;
3727
3728 init_waitqueue_head(&dasd_init_waitq);
8f61701b 3729 init_waitqueue_head(&dasd_flush_wq);
c80ee724 3730 init_waitqueue_head(&generic_waitq);
4679e893 3731 init_waitqueue_head(&shutdown_waitq);
1da177e4
LT		 3732
3733 /* register 'common' DASD debug area, used for all DBF_XXX calls */
361f494d 3734 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
1da177e4
LT		 3735 if (dasd_debug_area == NULL) {
3736 rc = -ENOMEM;
3737 goto failed;
3738 }
3739 debug_register_view(dasd_debug_area, &debug_sprintf_view);
b0035f12 3740 debug_set_level(dasd_debug_area, DBF_WARNING);
1da177e4
LT		 3741
3742 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3743
3744 dasd_diag_discipline_pointer = NULL;
3745
4fa52aa7
SW		 3746 dasd_statistics_createroot();
3747
1da177e4
LT		 3748 rc = dasd_devmap_init();
3749 if (rc)
3750 goto failed;
3751 rc = dasd_gendisk_init();
3752 if (rc)
3753 goto failed;
3754 rc = dasd_parse();
3755 if (rc)
3756 goto failed;
20c64468
SW		 3757 rc = dasd_eer_init();
3758 if (rc)
3759 goto failed;
1da177e4
LT		 3760#ifdef CONFIG_PROC_FS
3761 rc = dasd_proc_init();
3762 if (rc)
3763 goto failed;
3764#endif
3765
3766 return 0;
3767failed:
fc19f381 3768 pr_info("The DASD device driver could not be initialized\n");
1da177e4
LT		 3769 dasd_exit();
3770 return rc;
3771}
3772
3773module_init(dasd_init);
3774module_exit(dasd_exit);
3775
3776EXPORT_SYMBOL(dasd_debug_area);
3777EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3778
3779EXPORT_SYMBOL(dasd_add_request_head);
3780EXPORT_SYMBOL(dasd_add_request_tail);
3781EXPORT_SYMBOL(dasd_cancel_req);
8e09f215
SW		 3782EXPORT_SYMBOL(dasd_device_clear_timer);
3783EXPORT_SYMBOL(dasd_block_clear_timer);
1da177e4
LT		 3784EXPORT_SYMBOL(dasd_enable_device);
3785EXPORT_SYMBOL(dasd_int_handler);
3786EXPORT_SYMBOL(dasd_kfree_request);
3787EXPORT_SYMBOL(dasd_kick_device);
3788EXPORT_SYMBOL(dasd_kmalloc_request);
8e09f215
SW		 3789EXPORT_SYMBOL(dasd_schedule_device_bh);
3790EXPORT_SYMBOL(dasd_schedule_block_bh);
1da177e4 3791EXPORT_SYMBOL(dasd_set_target_state);
8e09f215
SW		 3792EXPORT_SYMBOL(dasd_device_set_timer);
3793EXPORT_SYMBOL(dasd_block_set_timer);
1da177e4
LT		 3794EXPORT_SYMBOL(dasd_sfree_request);
3795EXPORT_SYMBOL(dasd_sleep_on);
3796EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3797EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3798EXPORT_SYMBOL(dasd_smalloc_request);
3799EXPORT_SYMBOL(dasd_start_IO);
3800EXPORT_SYMBOL(dasd_term_IO);
3801
3802EXPORT_SYMBOL_GPL(dasd_generic_probe);
3803EXPORT_SYMBOL_GPL(dasd_generic_remove);
3804EXPORT_SYMBOL_GPL(dasd_generic_notify);
3805EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3806EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
8e09f215
SW		 3807EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3808EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3809EXPORT_SYMBOL_GPL(dasd_alloc_block);
3810EXPORT_SYMBOL_GPL(dasd_free_block);
kernel source for telekom puls (alcatel/mediatek)