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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
d41dd122 | 8 | * Copyright IBM Corp. 1999, 2009 |
1da177e4 LT |
9 | */ |
10 | ||
fc19f381 SH |
11 | #define KMSG_COMPONENT "dasd" |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
1da177e4 LT |
14 | #include <linux/kmod.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/buffer_head.h> | |
a885c8c4 | 21 | #include <linux/hdreg.h> |
f3445a1a | 22 | #include <linux/async.h> |
9eb25122 | 23 | #include <linux/mutex.h> |
1da177e4 LT |
24 | |
25 | #include <asm/ccwdev.h> | |
26 | #include <asm/ebcdic.h> | |
27 | #include <asm/idals.h> | |
f3eb5384 | 28 | #include <asm/itcw.h> |
33b62a30 | 29 | #include <asm/diag.h> |
1da177e4 LT |
30 | |
31 | /* This is ugly... */ | |
32 | #define PRINTK_HEADER "dasd:" | |
33 | ||
34 | #include "dasd_int.h" | |
35 | /* | |
36 | * SECTION: Constant definitions to be used within this file | |
37 | */ | |
38 | #define DASD_CHANQ_MAX_SIZE 4 | |
39 | ||
1c1e093c SW |
40 | #define DASD_SLEEPON_START_TAG (void *) 1 |
41 | #define DASD_SLEEPON_END_TAG (void *) 2 | |
42 | ||
1da177e4 LT |
43 | /* |
44 | * SECTION: exported variables of dasd.c | |
45 | */ | |
46 | debug_info_t *dasd_debug_area; | |
47 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 48 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
49 | |
50 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
51 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
52 | " Copyright 2000 IBM Corporation"); | |
53 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
54 | MODULE_LICENSE("GPL"); |
55 | ||
56 | /* | |
57 | * SECTION: prototypes for static functions of dasd.c | |
58 | */ | |
8e09f215 SW |
59 | static int dasd_alloc_queue(struct dasd_block *); |
60 | static void dasd_setup_queue(struct dasd_block *); | |
61 | static void dasd_free_queue(struct dasd_block *); | |
62 | static void dasd_flush_request_queue(struct dasd_block *); | |
63 | static int dasd_flush_block_queue(struct dasd_block *); | |
64 | static void dasd_device_tasklet(struct dasd_device *); | |
65 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 66 | static void do_kick_device(struct work_struct *); |
d41dd122 | 67 | static void do_restore_device(struct work_struct *); |
8e09f215 | 68 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
69 | static void dasd_device_timeout(unsigned long); |
70 | static void dasd_block_timeout(unsigned long); | |
eb6e199b | 71 | static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); |
1da177e4 LT |
72 | |
73 | /* | |
74 | * SECTION: Operations on the device structure. | |
75 | */ | |
76 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 77 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 78 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
79 | |
80 | /* | |
81 | * Allocate memory for a new device structure. | |
82 | */ | |
8e09f215 | 83 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
84 | { |
85 | struct dasd_device *device; | |
86 | ||
8e09f215 SW |
87 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
88 | if (!device) | |
1da177e4 | 89 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
90 | |
91 | /* Get two pages for normal block device operations. */ | |
92 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 93 | if (!device->ccw_mem) { |
1da177e4 LT |
94 | kfree(device); |
95 | return ERR_PTR(-ENOMEM); | |
96 | } | |
97 | /* Get one page for error recovery. */ | |
98 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 99 | if (!device->erp_mem) { |
1da177e4 LT |
100 | free_pages((unsigned long) device->ccw_mem, 1); |
101 | kfree(device); | |
102 | return ERR_PTR(-ENOMEM); | |
103 | } | |
104 | ||
105 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
106 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
107 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 108 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 109 | tasklet_init(&device->tasklet, |
8e09f215 | 110 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
111 | (unsigned long) device); |
112 | INIT_LIST_HEAD(&device->ccw_queue); | |
113 | init_timer(&device->timer); | |
48cae885 SW |
114 | device->timer.function = dasd_device_timeout; |
115 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 116 | INIT_WORK(&device->kick_work, do_kick_device); |
d41dd122 | 117 | INIT_WORK(&device->restore_device, do_restore_device); |
1da177e4 LT |
118 | device->state = DASD_STATE_NEW; |
119 | device->target = DASD_STATE_NEW; | |
9eb25122 | 120 | mutex_init(&device->state_mutex); |
1da177e4 LT |
121 | |
122 | return device; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Free memory of a device structure. | |
127 | */ | |
8e09f215 | 128 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 129 | { |
17fd682e | 130 | kfree(device->private); |
1da177e4 LT |
131 | free_page((unsigned long) device->erp_mem); |
132 | free_pages((unsigned long) device->ccw_mem, 1); | |
133 | kfree(device); | |
134 | } | |
135 | ||
8e09f215 SW |
136 | /* |
137 | * Allocate memory for a new device structure. | |
138 | */ | |
139 | struct dasd_block *dasd_alloc_block(void) | |
140 | { | |
141 | struct dasd_block *block; | |
142 | ||
143 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
144 | if (!block) | |
145 | return ERR_PTR(-ENOMEM); | |
146 | /* open_count = 0 means device online but not in use */ | |
147 | atomic_set(&block->open_count, -1); | |
148 | ||
149 | spin_lock_init(&block->request_queue_lock); | |
150 | atomic_set(&block->tasklet_scheduled, 0); | |
151 | tasklet_init(&block->tasklet, | |
152 | (void (*)(unsigned long)) dasd_block_tasklet, | |
153 | (unsigned long) block); | |
154 | INIT_LIST_HEAD(&block->ccw_queue); | |
155 | spin_lock_init(&block->queue_lock); | |
156 | init_timer(&block->timer); | |
48cae885 SW |
157 | block->timer.function = dasd_block_timeout; |
158 | block->timer.data = (unsigned long) block; | |
8e09f215 SW |
159 | |
160 | return block; | |
161 | } | |
162 | ||
163 | /* | |
164 | * Free memory of a device structure. | |
165 | */ | |
166 | void dasd_free_block(struct dasd_block *block) | |
167 | { | |
168 | kfree(block); | |
169 | } | |
170 | ||
1da177e4 LT |
171 | /* |
172 | * Make a new device known to the system. | |
173 | */ | |
8e09f215 | 174 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
175 | { |
176 | int rc; | |
177 | ||
178 | /* | |
138c014d | 179 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
180 | * keep the reference count > 0. |
181 | */ | |
182 | dasd_get_device(device); | |
183 | ||
8e09f215 SW |
184 | if (device->block) { |
185 | rc = dasd_alloc_queue(device->block); | |
186 | if (rc) { | |
187 | dasd_put_device(device); | |
188 | return rc; | |
189 | } | |
1da177e4 | 190 | } |
1da177e4 LT |
191 | device->state = DASD_STATE_KNOWN; |
192 | return 0; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Let the system forget about a device. | |
197 | */ | |
8e09f215 | 198 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 199 | { |
20c64468 SW |
200 | /* Disable extended error reporting for this device. */ |
201 | dasd_eer_disable(device); | |
1da177e4 | 202 | /* Forget the discipline information. */ |
8e09f215 SW |
203 | if (device->discipline) { |
204 | if (device->discipline->uncheck_device) | |
205 | device->discipline->uncheck_device(device); | |
aa88861f | 206 | module_put(device->discipline->owner); |
8e09f215 | 207 | } |
1da177e4 | 208 | device->discipline = NULL; |
aa88861f PO |
209 | if (device->base_discipline) |
210 | module_put(device->base_discipline->owner); | |
211 | device->base_discipline = NULL; | |
1da177e4 LT |
212 | device->state = DASD_STATE_NEW; |
213 | ||
8e09f215 SW |
214 | if (device->block) |
215 | dasd_free_queue(device->block); | |
1da177e4 LT |
216 | |
217 | /* Give up reference we took in dasd_state_new_to_known. */ | |
218 | dasd_put_device(device); | |
8f61701b | 219 | return 0; |
1da177e4 LT |
220 | } |
221 | ||
222 | /* | |
223 | * Request the irq line for the device. | |
224 | */ | |
8e09f215 | 225 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
226 | { |
227 | int rc; | |
228 | ||
229 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
230 | if (device->block) { |
231 | rc = dasd_gendisk_alloc(device->block); | |
232 | if (rc) | |
233 | return rc; | |
234 | } | |
1da177e4 | 235 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 236 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 237 | 8 * sizeof(long)); |
1da177e4 | 238 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 239 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
240 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
241 | ||
242 | device->state = DASD_STATE_BASIC; | |
243 | return 0; | |
244 | } | |
245 | ||
246 | /* | |
247 | * Release the irq line for the device. Terminate any running i/o. | |
248 | */ | |
8e09f215 | 249 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 250 | { |
8f61701b | 251 | int rc; |
8e09f215 SW |
252 | if (device->block) { |
253 | dasd_gendisk_free(device->block); | |
254 | dasd_block_clear_timer(device->block); | |
255 | } | |
256 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
257 | if (rc) |
258 | return rc; | |
8e09f215 | 259 | dasd_device_clear_timer(device); |
8f61701b | 260 | |
1da177e4 LT |
261 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
262 | if (device->debug_area != NULL) { | |
263 | debug_unregister(device->debug_area); | |
264 | device->debug_area = NULL; | |
265 | } | |
266 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 267 | return 0; |
1da177e4 LT |
268 | } |
269 | ||
270 | /* | |
271 | * Do the initial analysis. The do_analysis function may return | |
272 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
273 | * until the discipline decides to continue the startup sequence | |
274 | * by calling the function dasd_change_state. The eckd disciplines | |
275 | * uses this to start a ccw that detects the format. The completion | |
276 | * interrupt for this detection ccw uses the kernel event daemon to | |
277 | * trigger the call to dasd_change_state. All this is done in the | |
278 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
279 | * After the analysis ccw is done (do_analysis returned 0) the block |
280 | * device is setup. | |
281 | * In case the analysis returns an error, the device setup is stopped | |
282 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 283 | */ |
8e09f215 | 284 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
285 | { |
286 | int rc; | |
8e09f215 | 287 | struct dasd_block *block; |
1da177e4 LT |
288 | |
289 | rc = 0; | |
8e09f215 | 290 | block = device->block; |
90f0094d | 291 | /* make disk known with correct capacity */ |
8e09f215 SW |
292 | if (block) { |
293 | if (block->base->discipline->do_analysis != NULL) | |
294 | rc = block->base->discipline->do_analysis(block); | |
295 | if (rc) { | |
296 | if (rc != -EAGAIN) | |
297 | device->state = DASD_STATE_UNFMT; | |
298 | return rc; | |
299 | } | |
300 | dasd_setup_queue(block); | |
301 | set_capacity(block->gdp, | |
302 | block->blocks << block->s2b_shift); | |
303 | device->state = DASD_STATE_READY; | |
304 | rc = dasd_scan_partitions(block); | |
305 | if (rc) | |
306 | device->state = DASD_STATE_BASIC; | |
307 | } else { | |
308 | device->state = DASD_STATE_READY; | |
309 | } | |
90f0094d | 310 | return rc; |
1da177e4 LT |
311 | } |
312 | ||
313 | /* | |
314 | * Remove device from block device layer. Destroy dirty buffers. | |
315 | * Forget format information. Check if the target level is basic | |
316 | * and if it is create fake disk for formatting. | |
317 | */ | |
8e09f215 | 318 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 319 | { |
8f61701b HH |
320 | int rc; |
321 | ||
1da177e4 | 322 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
323 | if (device->block) { |
324 | struct dasd_block *block = device->block; | |
325 | rc = dasd_flush_block_queue(block); | |
326 | if (rc) { | |
327 | device->state = DASD_STATE_READY; | |
328 | return rc; | |
329 | } | |
8e09f215 | 330 | dasd_flush_request_queue(block); |
b695adfa | 331 | dasd_destroy_partitions(block); |
8e09f215 SW |
332 | block->blocks = 0; |
333 | block->bp_block = 0; | |
334 | block->s2b_shift = 0; | |
335 | } | |
8f61701b | 336 | return 0; |
1da177e4 LT |
337 | } |
338 | ||
90f0094d HH |
339 | /* |
340 | * Back to basic. | |
341 | */ | |
8e09f215 | 342 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
343 | { |
344 | device->state = DASD_STATE_BASIC; | |
8f61701b | 345 | return 0; |
90f0094d HH |
346 | } |
347 | ||
1da177e4 LT |
348 | /* |
349 | * Make the device online and schedule the bottom half to start | |
350 | * the requeueing of requests from the linux request queue to the | |
351 | * ccw queue. | |
352 | */ | |
8f61701b | 353 | static int |
1da177e4 LT |
354 | dasd_state_ready_to_online(struct dasd_device * device) |
355 | { | |
8e09f215 | 356 | int rc; |
1301809b SW |
357 | struct gendisk *disk; |
358 | struct disk_part_iter piter; | |
359 | struct hd_struct *part; | |
8e09f215 SW |
360 | |
361 | if (device->discipline->ready_to_online) { | |
362 | rc = device->discipline->ready_to_online(device); | |
363 | if (rc) | |
364 | return rc; | |
365 | } | |
1da177e4 | 366 | device->state = DASD_STATE_ONLINE; |
1301809b | 367 | if (device->block) { |
8e09f215 | 368 | dasd_schedule_block_bh(device->block); |
1301809b SW |
369 | disk = device->block->bdev->bd_disk; |
370 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
371 | while ((part = disk_part_iter_next(&piter))) | |
372 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
373 | disk_part_iter_exit(&piter); | |
374 | } | |
1da177e4 LT |
375 | return 0; |
376 | } | |
377 | ||
378 | /* | |
379 | * Stop the requeueing of requests again. | |
380 | */ | |
8e09f215 | 381 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 382 | { |
8e09f215 | 383 | int rc; |
1301809b SW |
384 | struct gendisk *disk; |
385 | struct disk_part_iter piter; | |
386 | struct hd_struct *part; | |
8e09f215 SW |
387 | |
388 | if (device->discipline->online_to_ready) { | |
389 | rc = device->discipline->online_to_ready(device); | |
390 | if (rc) | |
391 | return rc; | |
392 | } | |
1da177e4 | 393 | device->state = DASD_STATE_READY; |
1301809b SW |
394 | if (device->block) { |
395 | disk = device->block->bdev->bd_disk; | |
396 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
397 | while ((part = disk_part_iter_next(&piter))) | |
398 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
399 | disk_part_iter_exit(&piter); | |
400 | } | |
8f61701b | 401 | return 0; |
1da177e4 LT |
402 | } |
403 | ||
404 | /* | |
405 | * Device startup state changes. | |
406 | */ | |
8e09f215 | 407 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
408 | { |
409 | int rc; | |
410 | ||
411 | rc = 0; | |
412 | if (device->state == DASD_STATE_NEW && | |
413 | device->target >= DASD_STATE_KNOWN) | |
414 | rc = dasd_state_new_to_known(device); | |
415 | ||
416 | if (!rc && | |
417 | device->state == DASD_STATE_KNOWN && | |
418 | device->target >= DASD_STATE_BASIC) | |
419 | rc = dasd_state_known_to_basic(device); | |
420 | ||
421 | if (!rc && | |
422 | device->state == DASD_STATE_BASIC && | |
423 | device->target >= DASD_STATE_READY) | |
424 | rc = dasd_state_basic_to_ready(device); | |
425 | ||
39ccf95e HH |
426 | if (!rc && |
427 | device->state == DASD_STATE_UNFMT && | |
428 | device->target > DASD_STATE_UNFMT) | |
429 | rc = -EPERM; | |
430 | ||
1da177e4 LT |
431 | if (!rc && |
432 | device->state == DASD_STATE_READY && | |
433 | device->target >= DASD_STATE_ONLINE) | |
434 | rc = dasd_state_ready_to_online(device); | |
435 | ||
436 | return rc; | |
437 | } | |
438 | ||
439 | /* | |
440 | * Device shutdown state changes. | |
441 | */ | |
8e09f215 | 442 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 443 | { |
8f61701b HH |
444 | int rc; |
445 | ||
446 | rc = 0; | |
1da177e4 LT |
447 | if (device->state == DASD_STATE_ONLINE && |
448 | device->target <= DASD_STATE_READY) | |
8f61701b | 449 | rc = dasd_state_online_to_ready(device); |
138c014d | 450 | |
8f61701b HH |
451 | if (!rc && |
452 | device->state == DASD_STATE_READY && | |
1da177e4 | 453 | device->target <= DASD_STATE_BASIC) |
8f61701b | 454 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 455 | |
8f61701b HH |
456 | if (!rc && |
457 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 458 | device->target <= DASD_STATE_BASIC) |
8f61701b | 459 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 460 | |
8f61701b HH |
461 | if (!rc && |
462 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 463 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 464 | rc = dasd_state_basic_to_known(device); |
138c014d | 465 | |
8f61701b HH |
466 | if (!rc && |
467 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 468 | device->target <= DASD_STATE_NEW) |
8f61701b | 469 | rc = dasd_state_known_to_new(device); |
1da177e4 | 470 | |
8f61701b | 471 | return rc; |
1da177e4 LT |
472 | } |
473 | ||
474 | /* | |
475 | * This is the main startup/shutdown routine. | |
476 | */ | |
8e09f215 | 477 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 | 478 | { |
181d9522 | 479 | int rc; |
1da177e4 LT |
480 | |
481 | if (device->state == device->target) | |
482 | /* Already where we want to go today... */ | |
483 | return; | |
484 | if (device->state < device->target) | |
485 | rc = dasd_increase_state(device); | |
486 | else | |
487 | rc = dasd_decrease_state(device); | |
181d9522 SO |
488 | if (rc == -EAGAIN) |
489 | return; | |
490 | if (rc) | |
491 | device->target = device->state; | |
1da177e4 | 492 | |
9eb25122 | 493 | if (device->state == device->target) |
1da177e4 | 494 | wake_up(&dasd_init_waitq); |
4dfd5c45 HH |
495 | |
496 | /* let user-space know that the device status changed */ | |
497 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
498 | } |
499 | ||
500 | /* | |
501 | * Kick starter for devices that did not complete the startup/shutdown | |
502 | * procedure or were sleeping because of a pending state. | |
503 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
504 | * event daemon. | |
505 | */ | |
8e09f215 | 506 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 507 | { |
4927b3f7 | 508 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
9eb25122 | 509 | mutex_lock(&device->state_mutex); |
1da177e4 | 510 | dasd_change_state(device); |
9eb25122 | 511 | mutex_unlock(&device->state_mutex); |
8e09f215 | 512 | dasd_schedule_device_bh(device); |
1da177e4 LT |
513 | dasd_put_device(device); |
514 | } | |
515 | ||
8e09f215 | 516 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
517 | { |
518 | dasd_get_device(device); | |
519 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
520 | schedule_work(&device->kick_work); | |
521 | } | |
522 | ||
d41dd122 SH |
523 | /* |
524 | * dasd_restore_device will schedule a call do do_restore_device to the kernel | |
525 | * event daemon. | |
526 | */ | |
527 | static void do_restore_device(struct work_struct *work) | |
528 | { | |
529 | struct dasd_device *device = container_of(work, struct dasd_device, | |
530 | restore_device); | |
531 | device->cdev->drv->restore(device->cdev); | |
532 | dasd_put_device(device); | |
533 | } | |
534 | ||
535 | void dasd_restore_device(struct dasd_device *device) | |
536 | { | |
537 | dasd_get_device(device); | |
538 | /* queue call to dasd_restore_device to the kernel event daemon. */ | |
539 | schedule_work(&device->restore_device); | |
540 | } | |
541 | ||
1da177e4 LT |
542 | /* |
543 | * Set the target state for a device and starts the state change. | |
544 | */ | |
8e09f215 | 545 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 546 | { |
f3445a1a | 547 | dasd_get_device(device); |
9eb25122 | 548 | mutex_lock(&device->state_mutex); |
1da177e4 LT |
549 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
550 | if (dasd_probeonly && target > DASD_STATE_READY) | |
551 | target = DASD_STATE_READY; | |
552 | if (device->target != target) { | |
9eb25122 | 553 | if (device->state == target) |
1da177e4 LT |
554 | wake_up(&dasd_init_waitq); |
555 | device->target = target; | |
556 | } | |
557 | if (device->state != device->target) | |
558 | dasd_change_state(device); | |
9eb25122 SH |
559 | mutex_unlock(&device->state_mutex); |
560 | dasd_put_device(device); | |
1da177e4 LT |
561 | } |
562 | ||
563 | /* | |
564 | * Enable devices with device numbers in [from..to]. | |
565 | */ | |
8e09f215 | 566 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
567 | { |
568 | return (device->state == device->target); | |
569 | } | |
570 | ||
8e09f215 | 571 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
572 | { |
573 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
574 | if (device->state <= DASD_STATE_KNOWN) | |
575 | /* No discipline for device found. */ | |
576 | dasd_set_target_state(device, DASD_STATE_NEW); | |
577 | /* Now wait for the devices to come up. */ | |
578 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
579 | } | |
580 | ||
581 | /* | |
582 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
583 | */ | |
584 | #ifdef CONFIG_DASD_PROFILE | |
585 | ||
586 | struct dasd_profile_info_t dasd_global_profile; | |
587 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
588 | ||
589 | /* | |
590 | * Increments counter in global and local profiling structures. | |
591 | */ | |
8e09f215 | 592 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
593 | { \ |
594 | int index; \ | |
595 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
596 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 597 | block->profile.counter[index]++; \ |
1da177e4 LT |
598 | } |
599 | ||
600 | /* | |
601 | * Add profiling information for cqr before execution. | |
602 | */ | |
8e09f215 SW |
603 | static void dasd_profile_start(struct dasd_block *block, |
604 | struct dasd_ccw_req *cqr, | |
605 | struct request *req) | |
1da177e4 LT |
606 | { |
607 | struct list_head *l; | |
608 | unsigned int counter; | |
609 | ||
610 | if (dasd_profile_level != DASD_PROFILE_ON) | |
611 | return; | |
612 | ||
613 | /* count the length of the chanq for statistics */ | |
614 | counter = 0; | |
8e09f215 | 615 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
616 | if (++counter >= 31) |
617 | break; | |
618 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 619 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
620 | } |
621 | ||
622 | /* | |
623 | * Add profiling information for cqr after execution. | |
624 | */ | |
8e09f215 SW |
625 | static void dasd_profile_end(struct dasd_block *block, |
626 | struct dasd_ccw_req *cqr, | |
627 | struct request *req) | |
1da177e4 LT |
628 | { |
629 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
630 | long tottimeps, sectors; | |
631 | ||
632 | if (dasd_profile_level != DASD_PROFILE_ON) | |
633 | return; | |
634 | ||
83096ebf | 635 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
636 | if (!cqr->buildclk || !cqr->startclk || |
637 | !cqr->stopclk || !cqr->endclk || | |
638 | !sectors) | |
639 | return; | |
640 | ||
641 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
642 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
643 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
644 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
645 | tottimeps = tottime / sectors; | |
646 | ||
647 | if (!dasd_global_profile.dasd_io_reqs) | |
648 | memset(&dasd_global_profile, 0, | |
8e09f215 | 649 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
650 | dasd_global_profile.dasd_io_reqs++; |
651 | dasd_global_profile.dasd_io_sects += sectors; | |
652 | ||
8e09f215 SW |
653 | if (!block->profile.dasd_io_reqs) |
654 | memset(&block->profile, 0, | |
655 | sizeof(struct dasd_profile_info_t)); | |
656 | block->profile.dasd_io_reqs++; | |
657 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 658 | |
8e09f215 SW |
659 | dasd_profile_counter(sectors, dasd_io_secs, block); |
660 | dasd_profile_counter(tottime, dasd_io_times, block); | |
661 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
662 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
663 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
664 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
665 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
666 | } |
667 | #else | |
8e09f215 SW |
668 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
669 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
670 | #endif /* CONFIG_DASD_PROFILE */ |
671 | ||
672 | /* | |
673 | * Allocate memory for a channel program with 'cplength' channel | |
674 | * command words and 'datasize' additional space. There are two | |
675 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
676 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
677 | * that gets allocated for each device. | |
678 | */ | |
68b781fe | 679 | struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, |
8e09f215 SW |
680 | int datasize, |
681 | struct dasd_device *device) | |
1da177e4 LT |
682 | { |
683 | struct dasd_ccw_req *cqr; | |
684 | ||
685 | /* Sanity checks */ | |
68b781fe | 686 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 687 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 | 688 | |
88abaab4 | 689 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
690 | if (cqr == NULL) |
691 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
692 | cqr->cpaddr = NULL; |
693 | if (cplength > 0) { | |
88abaab4 | 694 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
695 | GFP_ATOMIC | GFP_DMA); |
696 | if (cqr->cpaddr == NULL) { | |
697 | kfree(cqr); | |
698 | return ERR_PTR(-ENOMEM); | |
699 | } | |
1da177e4 LT |
700 | } |
701 | cqr->data = NULL; | |
702 | if (datasize > 0) { | |
88abaab4 | 703 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 704 | if (cqr->data == NULL) { |
17fd682e | 705 | kfree(cqr->cpaddr); |
1da177e4 LT |
706 | kfree(cqr); |
707 | return ERR_PTR(-ENOMEM); | |
708 | } | |
1da177e4 | 709 | } |
68b781fe | 710 | cqr->magic = magic; |
1da177e4 LT |
711 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
712 | dasd_get_device(device); | |
713 | return cqr; | |
714 | } | |
715 | ||
68b781fe | 716 | struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
8e09f215 SW |
717 | int datasize, |
718 | struct dasd_device *device) | |
1da177e4 LT |
719 | { |
720 | unsigned long flags; | |
721 | struct dasd_ccw_req *cqr; | |
722 | char *data; | |
723 | int size; | |
724 | ||
725 | /* Sanity checks */ | |
68b781fe | 726 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 727 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 LT |
728 | |
729 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
730 | if (cplength > 0) | |
731 | size += cplength * sizeof(struct ccw1); | |
732 | if (datasize > 0) | |
733 | size += datasize; | |
734 | spin_lock_irqsave(&device->mem_lock, flags); | |
735 | cqr = (struct dasd_ccw_req *) | |
736 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
737 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
738 | if (cqr == NULL) | |
739 | return ERR_PTR(-ENOMEM); | |
740 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
741 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
742 | cqr->cpaddr = NULL; | |
743 | if (cplength > 0) { | |
744 | cqr->cpaddr = (struct ccw1 *) data; | |
745 | data += cplength*sizeof(struct ccw1); | |
746 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
747 | } | |
748 | cqr->data = NULL; | |
749 | if (datasize > 0) { | |
750 | cqr->data = data; | |
751 | memset(cqr->data, 0, datasize); | |
752 | } | |
68b781fe | 753 | cqr->magic = magic; |
1da177e4 LT |
754 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
755 | dasd_get_device(device); | |
756 | return cqr; | |
757 | } | |
758 | ||
759 | /* | |
760 | * Free memory of a channel program. This function needs to free all the | |
761 | * idal lists that might have been created by dasd_set_cda and the | |
762 | * struct dasd_ccw_req itself. | |
763 | */ | |
8e09f215 | 764 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 765 | { |
347a8dc3 | 766 | #ifdef CONFIG_64BIT |
1da177e4 LT |
767 | struct ccw1 *ccw; |
768 | ||
769 | /* Clear any idals used for the request. */ | |
770 | ccw = cqr->cpaddr; | |
771 | do { | |
772 | clear_normalized_cda(ccw); | |
773 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
774 | #endif | |
17fd682e JJ |
775 | kfree(cqr->cpaddr); |
776 | kfree(cqr->data); | |
1da177e4 LT |
777 | kfree(cqr); |
778 | dasd_put_device(device); | |
779 | } | |
780 | ||
8e09f215 | 781 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
782 | { |
783 | unsigned long flags; | |
784 | ||
785 | spin_lock_irqsave(&device->mem_lock, flags); | |
786 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
787 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
788 | dasd_put_device(device); | |
789 | } | |
790 | ||
791 | /* | |
792 | * Check discipline magic in cqr. | |
793 | */ | |
8e09f215 | 794 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
795 | { |
796 | struct dasd_device *device; | |
797 | ||
798 | if (cqr == NULL) | |
799 | return -EINVAL; | |
8e09f215 | 800 | device = cqr->startdev; |
1da177e4 | 801 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 802 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
803 | " dasd_ccw_req 0x%08x magic doesn't match" |
804 | " discipline 0x%08x", | |
805 | cqr->magic, | |
806 | *(unsigned int *) device->discipline->name); | |
807 | return -EINVAL; | |
808 | } | |
809 | return 0; | |
810 | } | |
811 | ||
812 | /* | |
813 | * Terminate the current i/o and set the request to clear_pending. | |
814 | * Timer keeps device runnig. | |
815 | * ccw_device_clear can fail if the i/o subsystem | |
816 | * is in a bad mood. | |
817 | */ | |
8e09f215 | 818 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
819 | { |
820 | struct dasd_device *device; | |
821 | int retries, rc; | |
fc19f381 | 822 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
823 | |
824 | /* Check the cqr */ | |
825 | rc = dasd_check_cqr(cqr); | |
826 | if (rc) | |
827 | return rc; | |
828 | retries = 0; | |
8e09f215 | 829 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
830 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
831 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
832 | switch (rc) { | |
833 | case 0: /* termination successful */ | |
c2ba444d | 834 | cqr->retries--; |
8e09f215 | 835 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 836 | cqr->stopclk = get_clock(); |
8f61701b | 837 | cqr->starttime = 0; |
1da177e4 LT |
838 | DBF_DEV_EVENT(DBF_DEBUG, device, |
839 | "terminate cqr %p successful", | |
840 | cqr); | |
841 | break; | |
842 | case -ENODEV: | |
843 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
844 | "device gone, retry"); | |
845 | break; | |
846 | case -EIO: | |
847 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
848 | "I/O error, retry"); | |
849 | break; | |
850 | case -EINVAL: | |
851 | case -EBUSY: | |
852 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
853 | "device busy, retry later"); | |
854 | break; | |
855 | default: | |
fc19f381 SH |
856 | /* internal error 10 - unknown rc*/ |
857 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
858 | dev_err(&device->cdev->dev, "An error occurred in the " | |
859 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
860 | BUG(); |
861 | break; | |
862 | } | |
863 | retries++; | |
864 | } | |
8e09f215 | 865 | dasd_schedule_device_bh(device); |
1da177e4 LT |
866 | return rc; |
867 | } | |
868 | ||
869 | /* | |
870 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
871 | * In that case set up a timer to start the request later. | |
872 | */ | |
8e09f215 | 873 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
874 | { |
875 | struct dasd_device *device; | |
876 | int rc; | |
fc19f381 | 877 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
878 | |
879 | /* Check the cqr */ | |
880 | rc = dasd_check_cqr(cqr); | |
6cc7f168 SW |
881 | if (rc) { |
882 | cqr->intrc = rc; | |
1da177e4 | 883 | return rc; |
6cc7f168 | 884 | } |
8e09f215 | 885 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 886 | if (cqr->retries < 0) { |
fc19f381 SH |
887 | /* internal error 14 - start_IO run out of retries */ |
888 | sprintf(errorstring, "14 %p", cqr); | |
889 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
890 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 891 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
892 | return -EIO; |
893 | } | |
894 | cqr->startclk = get_clock(); | |
895 | cqr->starttime = jiffies; | |
896 | cqr->retries--; | |
f3eb5384 SW |
897 | if (cqr->cpmode == 1) { |
898 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
899 | (long) cqr, cqr->lpm); | |
900 | } else { | |
901 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
902 | (long) cqr, cqr->lpm, 0); | |
903 | } | |
1da177e4 LT |
904 | switch (rc) { |
905 | case 0: | |
906 | cqr->status = DASD_CQR_IN_IO; | |
1da177e4 LT |
907 | break; |
908 | case -EBUSY: | |
fc19f381 | 909 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
910 | "start_IO: device busy, retry later"); |
911 | break; | |
912 | case -ETIMEDOUT: | |
fc19f381 | 913 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
914 | "start_IO: request timeout, retry later"); |
915 | break; | |
916 | case -EACCES: | |
917 | /* -EACCES indicates that the request used only a | |
918 | * subset of the available pathes and all these | |
919 | * pathes are gone. | |
920 | * Do a retry with all available pathes. | |
921 | */ | |
922 | cqr->lpm = LPM_ANYPATH; | |
fc19f381 | 923 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
924 | "start_IO: selected pathes gone," |
925 | " retry on all pathes"); | |
926 | break; | |
927 | case -ENODEV: | |
f3eb5384 SW |
928 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
929 | "start_IO: -ENODEV device gone, retry"); | |
930 | break; | |
1da177e4 | 931 | case -EIO: |
fc19f381 | 932 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
f3eb5384 | 933 | "start_IO: -EIO device gone, retry"); |
1da177e4 | 934 | break; |
d41dd122 SH |
935 | case -EINVAL: |
936 | /* most likely caused in power management context */ | |
937 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", | |
938 | "start_IO: -EINVAL device currently " | |
939 | "not accessible"); | |
940 | break; | |
1da177e4 | 941 | default: |
fc19f381 SH |
942 | /* internal error 11 - unknown rc */ |
943 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
944 | dev_err(&device->cdev->dev, | |
945 | "An error occurred in the DASD device driver, " | |
946 | "reason=%s\n", errorstring); | |
1da177e4 LT |
947 | BUG(); |
948 | break; | |
949 | } | |
6cc7f168 | 950 | cqr->intrc = rc; |
1da177e4 LT |
951 | return rc; |
952 | } | |
953 | ||
954 | /* | |
955 | * Timeout function for dasd devices. This is used for different purposes | |
956 | * 1) missing interrupt handler for normal operation | |
957 | * 2) delayed start of request where start_IO failed with -EBUSY | |
958 | * 3) timeout for missing state change interrupts | |
959 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
960 | * DASD_CQR_QUEUED for 2) and 3). | |
961 | */ | |
8e09f215 | 962 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
963 | { |
964 | unsigned long flags; | |
965 | struct dasd_device *device; | |
966 | ||
967 | device = (struct dasd_device *) ptr; | |
968 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
969 | /* re-activate request queue */ | |
eb6e199b | 970 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
1da177e4 | 971 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
8e09f215 | 972 | dasd_schedule_device_bh(device); |
1da177e4 LT |
973 | } |
974 | ||
975 | /* | |
976 | * Setup timeout for a device in jiffies. | |
977 | */ | |
8e09f215 | 978 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 979 | { |
48cae885 SW |
980 | if (expires == 0) |
981 | del_timer(&device->timer); | |
982 | else | |
983 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 LT |
984 | } |
985 | ||
986 | /* | |
987 | * Clear timeout for a device. | |
988 | */ | |
8e09f215 | 989 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 990 | { |
48cae885 | 991 | del_timer(&device->timer); |
1da177e4 LT |
992 | } |
993 | ||
8e09f215 SW |
994 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
995 | unsigned long intparm) | |
1da177e4 LT |
996 | { |
997 | struct dasd_ccw_req *cqr; | |
998 | struct dasd_device *device; | |
999 | ||
f16f5843 SW |
1000 | if (!intparm) |
1001 | return; | |
1da177e4 LT |
1002 | cqr = (struct dasd_ccw_req *) intparm; |
1003 | if (cqr->status != DASD_CQR_IN_IO) { | |
b8ed5dd5 SH |
1004 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, |
1005 | "invalid status in handle_killed_request: " | |
1006 | "%02x", cqr->status); | |
1da177e4 LT |
1007 | return; |
1008 | } | |
1009 | ||
589c74d5 SH |
1010 | device = dasd_device_from_cdev_locked(cdev); |
1011 | if (IS_ERR(device)) { | |
1012 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", | |
1013 | "unable to get device from cdev"); | |
1014 | return; | |
1015 | } | |
1016 | ||
1017 | if (!cqr->startdev || | |
1018 | device != cqr->startdev || | |
1019 | strncmp(cqr->startdev->discipline->ebcname, | |
1020 | (char *) &cqr->magic, 4)) { | |
294001a8 SH |
1021 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1022 | "invalid device in request"); | |
589c74d5 | 1023 | dasd_put_device(device); |
1da177e4 LT |
1024 | return; |
1025 | } | |
1026 | ||
1027 | /* Schedule request to be retried. */ | |
1028 | cqr->status = DASD_CQR_QUEUED; | |
1029 | ||
8e09f215 SW |
1030 | dasd_device_clear_timer(device); |
1031 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1032 | dasd_put_device(device); |
1033 | } | |
1034 | ||
8e09f215 | 1035 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 1036 | { |
20c64468 SW |
1037 | /* First of all start sense subsystem status request. */ |
1038 | dasd_eer_snss(device); | |
1039 | ||
eb6e199b | 1040 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
8e09f215 SW |
1041 | dasd_schedule_device_bh(device); |
1042 | if (device->block) | |
1043 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | /* | |
1047 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1048 | */ | |
8e09f215 SW |
1049 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1050 | struct irb *irb) | |
1da177e4 LT |
1051 | { |
1052 | struct dasd_ccw_req *cqr, *next; | |
1053 | struct dasd_device *device; | |
1054 | unsigned long long now; | |
1055 | int expires; | |
1da177e4 LT |
1056 | |
1057 | if (IS_ERR(irb)) { | |
1058 | switch (PTR_ERR(irb)) { | |
1059 | case -EIO: | |
1da177e4 LT |
1060 | break; |
1061 | case -ETIMEDOUT: | |
b8ed5dd5 SH |
1062 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1063 | "request timed out\n", __func__); | |
1da177e4 LT |
1064 | break; |
1065 | default: | |
b8ed5dd5 SH |
1066 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1067 | "unknown error %ld\n", __func__, | |
1068 | PTR_ERR(irb)); | |
1da177e4 | 1069 | } |
f16f5843 | 1070 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1071 | return; |
1072 | } | |
1073 | ||
1074 | now = get_clock(); | |
1075 | ||
8e09f215 SW |
1076 | /* check for unsolicited interrupts */ |
1077 | cqr = (struct dasd_ccw_req *) intparm; | |
f3eb5384 SW |
1078 | if (!cqr || ((scsw_cc(&irb->scsw) == 1) && |
1079 | (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) && | |
1080 | (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) { | |
8e09f215 SW |
1081 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
1082 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1083 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1084 | if (!IS_ERR(device)) { |
8e09f215 SW |
1085 | dasd_device_clear_timer(device); |
1086 | device->discipline->handle_unsolicited_interrupt(device, | |
1087 | irb); | |
1da177e4 LT |
1088 | dasd_put_device(device); |
1089 | } | |
1090 | return; | |
1091 | } | |
1092 | ||
8e09f215 SW |
1093 | device = (struct dasd_device *) cqr->startdev; |
1094 | if (!device || | |
1da177e4 | 1095 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
294001a8 SH |
1096 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1097 | "invalid device in request"); | |
1da177e4 LT |
1098 | return; |
1099 | } | |
1100 | ||
1101 | /* Check for clear pending */ | |
8e09f215 | 1102 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1103 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1104 | cqr->status = DASD_CQR_CLEARED; |
1105 | dasd_device_clear_timer(device); | |
8f61701b | 1106 | wake_up(&dasd_flush_wq); |
8e09f215 | 1107 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1108 | return; |
1109 | } | |
1110 | ||
f3eb5384 | 1111 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1112 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1113 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1114 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1115 | return; |
1116 | } | |
fc19f381 | 1117 | |
8e09f215 | 1118 | next = NULL; |
1da177e4 | 1119 | expires = 0; |
f3eb5384 SW |
1120 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1121 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1122 | /* request was completed successfully */ |
1123 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1124 | cqr->stopclk = now; |
1125 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1126 | if (cqr->devlist.next != &device->ccw_queue) { |
1127 | next = list_entry(cqr->devlist.next, | |
1128 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1129 | } |
8e09f215 SW |
1130 | } else { /* error */ |
1131 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
fc19f381 SH |
1132 | /* log sense for every failed I/O to s390 debugfeature */ |
1133 | dasd_log_sense_dbf(cqr, irb); | |
9575bf26 | 1134 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1135 | dasd_log_sense(cqr, irb); |
1136 | } | |
fc19f381 | 1137 | |
6c5f57c7 SH |
1138 | /* |
1139 | * If we don't want complex ERP for this request, then just | |
1140 | * reset this and retry it in the fastpath | |
8e09f215 | 1141 | */ |
6c5f57c7 | 1142 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1143 | cqr->retries > 0) { |
fc19f381 SH |
1144 | if (cqr->lpm == LPM_ANYPATH) |
1145 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
1146 | "default ERP in fastpath " | |
1147 | "(%i retries left)", | |
1148 | cqr->retries); | |
8e09f215 SW |
1149 | cqr->lpm = LPM_ANYPATH; |
1150 | cqr->status = DASD_CQR_QUEUED; | |
1151 | next = cqr; | |
1152 | } else | |
1da177e4 | 1153 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1154 | } |
1155 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1156 | (!device->stopped)) { | |
1157 | if (device->discipline->start_IO(next) == 0) | |
1158 | expires = next->expires; | |
1da177e4 LT |
1159 | } |
1160 | if (expires != 0) | |
8e09f215 | 1161 | dasd_device_set_timer(device, expires); |
1da177e4 | 1162 | else |
8e09f215 SW |
1163 | dasd_device_clear_timer(device); |
1164 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1165 | } |
1166 | ||
1167 | /* | |
8e09f215 SW |
1168 | * If we have an error on a dasd_block layer request then we cancel |
1169 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1170 | */ |
8e09f215 SW |
1171 | static void __dasd_device_recovery(struct dasd_device *device, |
1172 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1173 | { |
8e09f215 SW |
1174 | struct list_head *l, *n; |
1175 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1176 | |
8e09f215 SW |
1177 | /* |
1178 | * only requeue request that came from the dasd_block layer | |
1179 | */ | |
1180 | if (!ref_cqr->block) | |
1181 | return; | |
1da177e4 | 1182 | |
8e09f215 SW |
1183 | list_for_each_safe(l, n, &device->ccw_queue) { |
1184 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1185 | if (cqr->status == DASD_CQR_QUEUED && | |
1186 | ref_cqr->block == cqr->block) { | |
1187 | cqr->status = DASD_CQR_CLEARED; | |
1188 | } | |
1189 | } | |
1190 | }; | |
1da177e4 LT |
1191 | |
1192 | /* | |
8e09f215 SW |
1193 | * Remove those ccw requests from the queue that need to be returned |
1194 | * to the upper layer. | |
1da177e4 | 1195 | */ |
8e09f215 SW |
1196 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1197 | struct list_head *final_queue) | |
1da177e4 LT |
1198 | { |
1199 | struct list_head *l, *n; | |
1200 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1201 | |
1da177e4 LT |
1202 | /* Process request with final status. */ |
1203 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1204 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1205 | ||
1da177e4 | 1206 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1207 | if (cqr->status == DASD_CQR_QUEUED || |
1208 | cqr->status == DASD_CQR_IN_IO || | |
1209 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1210 | break; |
1da177e4 | 1211 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1212 | __dasd_device_recovery(device, cqr); |
20c64468 | 1213 | } |
1da177e4 | 1214 | /* Rechain finished requests to final queue */ |
8e09f215 | 1215 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1216 | } |
1217 | } | |
1218 | ||
1da177e4 | 1219 | /* |
8e09f215 SW |
1220 | * the cqrs from the final queue are returned to the upper layer |
1221 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1222 | */ |
8e09f215 SW |
1223 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1224 | struct list_head *final_queue) | |
1da177e4 | 1225 | { |
8e09f215 | 1226 | struct list_head *l, *n; |
1da177e4 | 1227 | struct dasd_ccw_req *cqr; |
03513bcc | 1228 | struct dasd_block *block; |
c80ee724 SH |
1229 | void (*callback)(struct dasd_ccw_req *, void *data); |
1230 | void *callback_data; | |
fc19f381 | 1231 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1232 | |
8e09f215 SW |
1233 | list_for_each_safe(l, n, final_queue) { |
1234 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1235 | list_del_init(&cqr->devlist); | |
03513bcc | 1236 | block = cqr->block; |
c80ee724 SH |
1237 | callback = cqr->callback; |
1238 | callback_data = cqr->callback_data; | |
03513bcc SW |
1239 | if (block) |
1240 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1241 | switch (cqr->status) { |
1242 | case DASD_CQR_SUCCESS: | |
1243 | cqr->status = DASD_CQR_DONE; | |
1244 | break; | |
1245 | case DASD_CQR_ERROR: | |
1246 | cqr->status = DASD_CQR_NEED_ERP; | |
1247 | break; | |
1248 | case DASD_CQR_CLEARED: | |
1249 | cqr->status = DASD_CQR_TERMINATED; | |
1250 | break; | |
1251 | default: | |
fc19f381 SH |
1252 | /* internal error 12 - wrong cqr status*/ |
1253 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1254 | dev_err(&device->cdev->dev, | |
1255 | "An error occurred in the DASD device driver, " | |
1256 | "reason=%s\n", errorstring); | |
8e09f215 | 1257 | BUG(); |
1da177e4 | 1258 | } |
8e09f215 | 1259 | if (cqr->callback != NULL) |
c80ee724 | 1260 | (callback)(cqr, callback_data); |
03513bcc SW |
1261 | if (block) |
1262 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1263 | } |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * Take a look at the first request on the ccw queue and check | |
1268 | * if it reached its expire time. If so, terminate the IO. | |
1269 | */ | |
8e09f215 | 1270 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1271 | { |
1272 | struct dasd_ccw_req *cqr; | |
1273 | ||
1274 | if (list_empty(&device->ccw_queue)) | |
1275 | return; | |
8e09f215 | 1276 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1277 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1278 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1279 | if (device->discipline->term_IO(cqr) != 0) { | |
1280 | /* Hmpf, try again in 5 sec */ | |
fc19f381 SH |
1281 | dev_err(&device->cdev->dev, |
1282 | "cqr %p timed out (%is) but cannot be " | |
1283 | "ended, retrying in 5 s\n", | |
1284 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1285 | cqr->expires += 5*HZ; |
1286 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1287 | } else { |
fc19f381 SH |
1288 | dev_err(&device->cdev->dev, |
1289 | "cqr %p timed out (%is), %i retries " | |
1290 | "remaining\n", cqr, (cqr->expires/HZ), | |
1291 | cqr->retries); | |
1da177e4 LT |
1292 | } |
1293 | } | |
1294 | } | |
1295 | ||
1296 | /* | |
1297 | * Take a look at the first request on the ccw queue and check | |
1298 | * if it needs to be started. | |
1299 | */ | |
8e09f215 | 1300 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1301 | { |
1302 | struct dasd_ccw_req *cqr; | |
1303 | int rc; | |
1304 | ||
1305 | if (list_empty(&device->ccw_queue)) | |
1306 | return; | |
8e09f215 | 1307 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1308 | if (cqr->status != DASD_CQR_QUEUED) |
1309 | return; | |
8e09f215 SW |
1310 | /* when device is stopped, return request to previous layer */ |
1311 | if (device->stopped) { | |
1312 | cqr->status = DASD_CQR_CLEARED; | |
1313 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1314 | return; |
1c01b8a5 | 1315 | } |
25ee4cf8 PO |
1316 | |
1317 | rc = device->discipline->start_IO(cqr); | |
1318 | if (rc == 0) | |
8e09f215 | 1319 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1320 | else if (rc == -EACCES) { |
8e09f215 | 1321 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1322 | } else |
1323 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1324 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1325 | } |
1326 | ||
1da177e4 | 1327 | /* |
8e09f215 SW |
1328 | * Go through all request on the dasd_device request queue, |
1329 | * terminate them on the cdev if necessary, and return them to the | |
1330 | * submitting layer via callback. | |
1331 | * Note: | |
1332 | * Make sure that all 'submitting layers' still exist when | |
1333 | * this function is called!. In other words, when 'device' is a base | |
1334 | * device then all block layer requests must have been removed before | |
1335 | * via dasd_flush_block_queue. | |
1da177e4 | 1336 | */ |
8e09f215 | 1337 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1338 | { |
8e09f215 SW |
1339 | struct dasd_ccw_req *cqr, *n; |
1340 | int rc; | |
1da177e4 | 1341 | struct list_head flush_queue; |
1da177e4 LT |
1342 | |
1343 | INIT_LIST_HEAD(&flush_queue); | |
1344 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1345 | rc = 0; |
8e09f215 | 1346 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1347 | /* Check status and move request to flush_queue */ |
1348 | switch (cqr->status) { | |
1349 | case DASD_CQR_IN_IO: | |
1350 | rc = device->discipline->term_IO(cqr); | |
1351 | if (rc) { | |
1352 | /* unable to terminate requeust */ | |
fc19f381 SH |
1353 | dev_err(&device->cdev->dev, |
1354 | "Flushing the DASD request queue " | |
1355 | "failed for request %p\n", cqr); | |
8f61701b HH |
1356 | /* stop flush processing */ |
1357 | goto finished; | |
1358 | } | |
1359 | break; | |
1360 | case DASD_CQR_QUEUED: | |
1da177e4 | 1361 | cqr->stopclk = get_clock(); |
8e09f215 | 1362 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1363 | break; |
8e09f215 | 1364 | default: /* no need to modify the others */ |
8f61701b HH |
1365 | break; |
1366 | } | |
8e09f215 | 1367 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1368 | } |
8f61701b HH |
1369 | finished: |
1370 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1371 | /* |
1372 | * After this point all requests must be in state CLEAR_PENDING, | |
1373 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1374 | * one of the others. | |
1375 | */ | |
1376 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1377 | wait_event(dasd_flush_wq, | |
1378 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1379 | /* | |
1380 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1381 | * and call the callback function of flushed requests | |
1382 | */ | |
1383 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1384 | return rc; |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | /* | |
1388 | * Acquire the device lock and process queues for the device. | |
1389 | */ | |
8e09f215 | 1390 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1391 | { |
1392 | struct list_head final_queue; | |
1da177e4 LT |
1393 | |
1394 | atomic_set (&device->tasklet_scheduled, 0); | |
1395 | INIT_LIST_HEAD(&final_queue); | |
1396 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1397 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1398 | __dasd_device_check_expire(device); |
1399 | /* find final requests on ccw queue */ | |
1400 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1401 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1402 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1403 | __dasd_device_process_final_queue(device, &final_queue); |
1404 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1405 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1406 | __dasd_device_start_head(device); |
1407 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1408 | dasd_put_device(device); |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1413 | */ | |
8e09f215 | 1414 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1415 | { |
1416 | /* Protect against rescheduling. */ | |
973bd993 | 1417 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1418 | return; |
1419 | dasd_get_device(device); | |
1420 | tasklet_hi_schedule(&device->tasklet); | |
1421 | } | |
1422 | ||
eb6e199b SW |
1423 | void dasd_device_set_stop_bits(struct dasd_device *device, int bits) |
1424 | { | |
1425 | device->stopped |= bits; | |
1426 | } | |
1427 | EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); | |
1428 | ||
1429 | void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) | |
1430 | { | |
1431 | device->stopped &= ~bits; | |
1432 | if (!device->stopped) | |
1433 | wake_up(&generic_waitq); | |
1434 | } | |
1435 | EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); | |
1436 | ||
1da177e4 | 1437 | /* |
8e09f215 SW |
1438 | * Queue a request to the head of the device ccw_queue. |
1439 | * Start the I/O if possible. | |
1da177e4 | 1440 | */ |
8e09f215 | 1441 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1442 | { |
1443 | struct dasd_device *device; | |
1444 | unsigned long flags; | |
1445 | ||
8e09f215 | 1446 | device = cqr->startdev; |
1da177e4 | 1447 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1448 | cqr->status = DASD_CQR_QUEUED; |
1449 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1450 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1451 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1452 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1453 | } | |
1454 | ||
1455 | /* | |
8e09f215 SW |
1456 | * Queue a request to the tail of the device ccw_queue. |
1457 | * Start the I/O if possible. | |
1da177e4 | 1458 | */ |
8e09f215 | 1459 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1460 | { |
1461 | struct dasd_device *device; | |
1462 | unsigned long flags; | |
1463 | ||
8e09f215 | 1464 | device = cqr->startdev; |
1da177e4 | 1465 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1466 | cqr->status = DASD_CQR_QUEUED; |
1467 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1468 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1469 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1470 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1471 | } | |
1472 | ||
1473 | /* | |
8e09f215 | 1474 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1475 | */ |
8e09f215 | 1476 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 | 1477 | { |
1c1e093c SW |
1478 | spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); |
1479 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
1480 | spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); | |
1481 | wake_up(&generic_waitq); | |
1da177e4 LT |
1482 | } |
1483 | ||
8e09f215 | 1484 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1485 | { |
1486 | struct dasd_device *device; | |
1487 | int rc; | |
1488 | ||
8e09f215 | 1489 | device = cqr->startdev; |
1da177e4 | 1490 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1c1e093c | 1491 | rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); |
1da177e4 LT |
1492 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1493 | return rc; | |
1494 | } | |
1495 | ||
1496 | /* | |
eb6e199b | 1497 | * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. |
1da177e4 | 1498 | */ |
eb6e199b | 1499 | static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) |
1da177e4 | 1500 | { |
1da177e4 | 1501 | struct dasd_device *device; |
eb6e199b | 1502 | dasd_erp_fn_t erp_fn; |
138c014d | 1503 | |
eb6e199b SW |
1504 | if (cqr->status == DASD_CQR_FILLED) |
1505 | return 0; | |
8e09f215 | 1506 | device = cqr->startdev; |
eb6e199b SW |
1507 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
1508 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1509 | device->discipline->handle_terminated_request(cqr); | |
1510 | return 1; | |
1511 | } | |
1512 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
1513 | erp_fn = device->discipline->erp_action(cqr); | |
1514 | erp_fn(cqr); | |
1515 | return 1; | |
1516 | } | |
1517 | if (cqr->status == DASD_CQR_FAILED) | |
1518 | dasd_log_sense(cqr, &cqr->irb); | |
1519 | if (cqr->refers) { | |
1520 | __dasd_process_erp(device, cqr); | |
1521 | return 1; | |
1522 | } | |
1523 | } | |
1524 | return 0; | |
1525 | } | |
138c014d | 1526 | |
eb6e199b SW |
1527 | static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) |
1528 | { | |
1529 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { | |
1530 | if (cqr->refers) /* erp is not done yet */ | |
1531 | return 1; | |
1532 | return ((cqr->status != DASD_CQR_DONE) && | |
1533 | (cqr->status != DASD_CQR_FAILED)); | |
1534 | } else | |
1535 | return (cqr->status == DASD_CQR_FILLED); | |
1536 | } | |
138c014d | 1537 | |
eb6e199b SW |
1538 | static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) |
1539 | { | |
1540 | struct dasd_device *device; | |
1541 | int rc; | |
1542 | struct list_head ccw_queue; | |
1543 | struct dasd_ccw_req *cqr; | |
1544 | ||
1545 | INIT_LIST_HEAD(&ccw_queue); | |
1546 | maincqr->status = DASD_CQR_FILLED; | |
1547 | device = maincqr->startdev; | |
1548 | list_add(&maincqr->blocklist, &ccw_queue); | |
1549 | for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); | |
1550 | cqr = list_first_entry(&ccw_queue, | |
1551 | struct dasd_ccw_req, blocklist)) { | |
1552 | ||
1553 | if (__dasd_sleep_on_erp(cqr)) | |
1554 | continue; | |
1555 | if (cqr->status != DASD_CQR_FILLED) /* could be failed */ | |
1556 | continue; | |
1557 | ||
1558 | /* Non-temporary stop condition will trigger fail fast */ | |
1559 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
1560 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1561 | (!dasd_eer_enabled(device))) { | |
1562 | cqr->status = DASD_CQR_FAILED; | |
1563 | continue; | |
1564 | } | |
1565 | ||
1566 | /* Don't try to start requests if device is stopped */ | |
1567 | if (interruptible) { | |
1568 | rc = wait_event_interruptible( | |
1569 | generic_waitq, !(device->stopped)); | |
1570 | if (rc == -ERESTARTSYS) { | |
1571 | cqr->status = DASD_CQR_FAILED; | |
1572 | maincqr->intrc = rc; | |
1573 | continue; | |
1574 | } | |
1575 | } else | |
1576 | wait_event(generic_waitq, !(device->stopped)); | |
1577 | ||
1578 | cqr->callback = dasd_wakeup_cb; | |
1c1e093c | 1579 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
eb6e199b SW |
1580 | dasd_add_request_tail(cqr); |
1581 | if (interruptible) { | |
1582 | rc = wait_event_interruptible( | |
1583 | generic_waitq, _wait_for_wakeup(cqr)); | |
1584 | if (rc == -ERESTARTSYS) { | |
1585 | dasd_cancel_req(cqr); | |
1586 | /* wait (non-interruptible) for final status */ | |
1587 | wait_event(generic_waitq, | |
1588 | _wait_for_wakeup(cqr)); | |
1589 | cqr->status = DASD_CQR_FAILED; | |
1590 | maincqr->intrc = rc; | |
1591 | continue; | |
1592 | } | |
1593 | } else | |
1594 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); | |
1595 | } | |
1596 | ||
1597 | maincqr->endclk = get_clock(); | |
1598 | if ((maincqr->status != DASD_CQR_DONE) && | |
1599 | (maincqr->intrc != -ERESTARTSYS)) | |
1600 | dasd_log_sense(maincqr, &maincqr->irb); | |
1601 | if (maincqr->status == DASD_CQR_DONE) | |
6cc7f168 | 1602 | rc = 0; |
eb6e199b SW |
1603 | else if (maincqr->intrc) |
1604 | rc = maincqr->intrc; | |
6cc7f168 SW |
1605 | else |
1606 | rc = -EIO; | |
1da177e4 LT |
1607 | return rc; |
1608 | } | |
1609 | ||
eb6e199b SW |
1610 | /* |
1611 | * Queue a request to the tail of the device ccw_queue and wait for | |
1612 | * it's completion. | |
1613 | */ | |
1614 | int dasd_sleep_on(struct dasd_ccw_req *cqr) | |
1615 | { | |
1616 | return _dasd_sleep_on(cqr, 0); | |
1617 | } | |
1618 | ||
1da177e4 | 1619 | /* |
8e09f215 SW |
1620 | * Queue a request to the tail of the device ccw_queue and wait |
1621 | * interruptible for it's completion. | |
1da177e4 | 1622 | */ |
8e09f215 | 1623 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1624 | { |
eb6e199b | 1625 | return _dasd_sleep_on(cqr, 1); |
1da177e4 LT |
1626 | } |
1627 | ||
1628 | /* | |
1629 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1630 | * for eckd devices) the currently running request has to be terminated | |
1631 | * and be put back to status queued, before the special request is added | |
1632 | * to the head of the queue. Then the special request is waited on normally. | |
1633 | */ | |
8e09f215 | 1634 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1635 | { |
1636 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1637 | |
1638 | if (list_empty(&device->ccw_queue)) | |
1639 | return 0; | |
8e09f215 | 1640 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1641 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1642 | } |
1643 | ||
8e09f215 | 1644 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1645 | { |
1da177e4 LT |
1646 | struct dasd_device *device; |
1647 | int rc; | |
138c014d | 1648 | |
8e09f215 | 1649 | device = cqr->startdev; |
1da177e4 LT |
1650 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1651 | rc = _dasd_term_running_cqr(device); | |
1652 | if (rc) { | |
1653 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1654 | return rc; | |
1655 | } | |
138c014d | 1656 | |
1da177e4 | 1657 | cqr->callback = dasd_wakeup_cb; |
1c1e093c | 1658 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
1da177e4 | 1659 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1660 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1661 | |
1da177e4 | 1662 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1663 | dasd_schedule_device_bh(device); |
138c014d | 1664 | |
1da177e4 LT |
1665 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1666 | ||
c80ee724 | 1667 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1668 | |
6cc7f168 SW |
1669 | if (cqr->status == DASD_CQR_DONE) |
1670 | rc = 0; | |
1671 | else if (cqr->intrc) | |
1672 | rc = cqr->intrc; | |
1673 | else | |
1674 | rc = -EIO; | |
1da177e4 LT |
1675 | return rc; |
1676 | } | |
1677 | ||
1678 | /* | |
1679 | * Cancels a request that was started with dasd_sleep_on_req. | |
1680 | * This is useful to timeout requests. The request will be | |
1681 | * terminated if it is currently in i/o. | |
1682 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1683 | * 0 if there was no need to terminate the request (not started yet) |
1684 | * negative error code if termination failed | |
1685 | * Cancellation of a request is an asynchronous operation! The calling | |
1686 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1687 | */ |
8e09f215 | 1688 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1689 | { |
8e09f215 | 1690 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1691 | unsigned long flags; |
1692 | int rc; | |
1693 | ||
1694 | rc = 0; | |
1695 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1696 | switch (cqr->status) { | |
1697 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1698 | /* request was not started - just set to cleared */ |
1699 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1700 | break; |
1701 | case DASD_CQR_IN_IO: | |
1702 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1703 | rc = device->discipline->term_IO(cqr); |
1704 | if (rc) { | |
fc19f381 SH |
1705 | dev_err(&device->cdev->dev, |
1706 | "Cancelling request %p failed with rc=%d\n", | |
1707 | cqr, rc); | |
8e09f215 SW |
1708 | } else { |
1709 | cqr->stopclk = get_clock(); | |
8e09f215 | 1710 | } |
1da177e4 | 1711 | break; |
8e09f215 | 1712 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1713 | break; |
8e09f215 SW |
1714 | } |
1715 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1716 | dasd_schedule_device_bh(device); | |
1717 | return rc; | |
1718 | } | |
1719 | ||
1720 | ||
1721 | /* | |
1722 | * SECTION: Operations of the dasd_block layer. | |
1723 | */ | |
1724 | ||
1725 | /* | |
1726 | * Timeout function for dasd_block. This is used when the block layer | |
1727 | * is waiting for something that may not come reliably, (e.g. a state | |
1728 | * change interrupt) | |
1729 | */ | |
1730 | static void dasd_block_timeout(unsigned long ptr) | |
1731 | { | |
1732 | unsigned long flags; | |
1733 | struct dasd_block *block; | |
1734 | ||
1735 | block = (struct dasd_block *) ptr; | |
1736 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1737 | /* re-activate request queue */ | |
eb6e199b | 1738 | dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); |
8e09f215 SW |
1739 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
1740 | dasd_schedule_block_bh(block); | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * Setup timeout for a dasd_block in jiffies. | |
1745 | */ | |
1746 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1747 | { | |
48cae885 SW |
1748 | if (expires == 0) |
1749 | del_timer(&block->timer); | |
1750 | else | |
1751 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 SW |
1752 | } |
1753 | ||
1754 | /* | |
1755 | * Clear timeout for a dasd_block. | |
1756 | */ | |
1757 | void dasd_block_clear_timer(struct dasd_block *block) | |
1758 | { | |
48cae885 | 1759 | del_timer(&block->timer); |
8e09f215 SW |
1760 | } |
1761 | ||
8e09f215 SW |
1762 | /* |
1763 | * Process finished error recovery ccw. | |
1764 | */ | |
eb6e199b SW |
1765 | static void __dasd_process_erp(struct dasd_device *device, |
1766 | struct dasd_ccw_req *cqr) | |
8e09f215 SW |
1767 | { |
1768 | dasd_erp_fn_t erp_fn; | |
8e09f215 SW |
1769 | |
1770 | if (cqr->status == DASD_CQR_DONE) | |
1771 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1772 | else | |
fc19f381 | 1773 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
1774 | erp_fn = device->discipline->erp_postaction(cqr); |
1775 | erp_fn(cqr); | |
1776 | } | |
1da177e4 | 1777 | |
8e09f215 SW |
1778 | /* |
1779 | * Fetch requests from the block device queue. | |
1780 | */ | |
1781 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1782 | { | |
1783 | struct request_queue *queue; | |
1784 | struct request *req; | |
1785 | struct dasd_ccw_req *cqr; | |
1786 | struct dasd_device *basedev; | |
1787 | unsigned long flags; | |
1788 | queue = block->request_queue; | |
1789 | basedev = block->base; | |
1790 | /* No queue ? Then there is nothing to do. */ | |
1791 | if (queue == NULL) | |
1792 | return; | |
1793 | ||
1794 | /* | |
1795 | * We requeue request from the block device queue to the ccw | |
1796 | * queue only in two states. In state DASD_STATE_READY the | |
1797 | * partition detection is done and we need to requeue requests | |
1798 | * for that. State DASD_STATE_ONLINE is normal block device | |
1799 | * operation. | |
1800 | */ | |
97f604b0 SW |
1801 | if (basedev->state < DASD_STATE_READY) { |
1802 | while ((req = blk_fetch_request(block->request_queue))) | |
1803 | __blk_end_request_all(req, -EIO); | |
8e09f215 | 1804 | return; |
97f604b0 | 1805 | } |
8e09f215 | 1806 | /* Now we try to fetch requests from the request queue */ |
9934c8c0 | 1807 | while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) { |
8e09f215 SW |
1808 | if (basedev->features & DASD_FEATURE_READONLY && |
1809 | rq_data_dir(req) == WRITE) { | |
1810 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1811 | "Rejecting write request %p", | |
1812 | req); | |
9934c8c0 | 1813 | blk_start_request(req); |
40cbbb78 | 1814 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1815 | continue; |
1816 | } | |
1817 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1818 | if (IS_ERR(cqr)) { | |
1819 | if (PTR_ERR(cqr) == -EBUSY) | |
1820 | break; /* normal end condition */ | |
1821 | if (PTR_ERR(cqr) == -ENOMEM) | |
1822 | break; /* terminate request queue loop */ | |
1823 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1824 | /* | |
1825 | * The current request cannot be build right | |
1826 | * now, we have to try later. If this request | |
1827 | * is the head-of-queue we stop the device | |
1828 | * for 1/2 second. | |
1829 | */ | |
1830 | if (!list_empty(&block->ccw_queue)) | |
1831 | break; | |
eb6e199b SW |
1832 | spin_lock_irqsave( |
1833 | get_ccwdev_lock(basedev->cdev), flags); | |
1834 | dasd_device_set_stop_bits(basedev, | |
1835 | DASD_STOPPED_PENDING); | |
1836 | spin_unlock_irqrestore( | |
1837 | get_ccwdev_lock(basedev->cdev), flags); | |
8e09f215 SW |
1838 | dasd_block_set_timer(block, HZ/2); |
1839 | break; | |
1840 | } | |
1841 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1842 | "CCW creation failed (rc=%ld) " | |
1843 | "on request %p", | |
1844 | PTR_ERR(cqr), req); | |
9934c8c0 | 1845 | blk_start_request(req); |
40cbbb78 | 1846 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1847 | continue; |
1848 | } | |
1849 | /* | |
1850 | * Note: callback is set to dasd_return_cqr_cb in | |
1851 | * __dasd_block_start_head to cover erp requests as well | |
1852 | */ | |
1853 | cqr->callback_data = (void *) req; | |
1854 | cqr->status = DASD_CQR_FILLED; | |
9934c8c0 | 1855 | blk_start_request(req); |
8e09f215 SW |
1856 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
1857 | dasd_profile_start(block, cqr, req); | |
1858 | } | |
1859 | } | |
1860 | ||
1861 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1862 | { | |
1863 | struct request *req; | |
1864 | int status; | |
4c4e2148 | 1865 | int error = 0; |
8e09f215 SW |
1866 | |
1867 | req = (struct request *) cqr->callback_data; | |
1868 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1869 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1870 | if (status <= 0) |
1871 | error = status ? status : -EIO; | |
40cbbb78 | 1872 | __blk_end_request_all(req, error); |
8e09f215 SW |
1873 | } |
1874 | ||
1875 | /* | |
1876 | * Process ccw request queue. | |
1877 | */ | |
1878 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1879 | struct list_head *final_queue) | |
1880 | { | |
1881 | struct list_head *l, *n; | |
1882 | struct dasd_ccw_req *cqr; | |
1883 | dasd_erp_fn_t erp_fn; | |
1884 | unsigned long flags; | |
1885 | struct dasd_device *base = block->base; | |
1886 | ||
1887 | restart: | |
1888 | /* Process request with final status. */ | |
1889 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1890 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1891 | if (cqr->status != DASD_CQR_DONE && | |
1892 | cqr->status != DASD_CQR_FAILED && | |
1893 | cqr->status != DASD_CQR_NEED_ERP && | |
1894 | cqr->status != DASD_CQR_TERMINATED) | |
1895 | continue; | |
1896 | ||
1897 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1898 | base->discipline->handle_terminated_request(cqr); | |
1899 | goto restart; | |
1900 | } | |
1901 | ||
1902 | /* Process requests that may be recovered */ | |
1903 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 | 1904 | erp_fn = base->discipline->erp_action(cqr); |
6a5176c4 SH |
1905 | if (IS_ERR(erp_fn(cqr))) |
1906 | continue; | |
8e09f215 SW |
1907 | goto restart; |
1908 | } | |
1909 | ||
a9cffb22 SH |
1910 | /* log sense for fatal error */ |
1911 | if (cqr->status == DASD_CQR_FAILED) { | |
1912 | dasd_log_sense(cqr, &cqr->irb); | |
1913 | } | |
1914 | ||
8e09f215 SW |
1915 | /* First of all call extended error reporting. */ |
1916 | if (dasd_eer_enabled(base) && | |
1917 | cqr->status == DASD_CQR_FAILED) { | |
1918 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1919 | ||
1920 | /* restart request */ | |
1921 | cqr->status = DASD_CQR_FILLED; | |
1922 | cqr->retries = 255; | |
1923 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
eb6e199b | 1924 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 SW |
1925 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
1926 | flags); | |
1927 | goto restart; | |
1928 | } | |
1929 | ||
1930 | /* Process finished ERP request. */ | |
1931 | if (cqr->refers) { | |
eb6e199b | 1932 | __dasd_process_erp(base, cqr); |
8e09f215 SW |
1933 | goto restart; |
1934 | } | |
1935 | ||
1936 | /* Rechain finished requests to final queue */ | |
1937 | cqr->endclk = get_clock(); | |
1938 | list_move_tail(&cqr->blocklist, final_queue); | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1943 | { | |
1944 | dasd_schedule_block_bh(cqr->block); | |
1945 | } | |
1946 | ||
1947 | static void __dasd_block_start_head(struct dasd_block *block) | |
1948 | { | |
1949 | struct dasd_ccw_req *cqr; | |
1950 | ||
1951 | if (list_empty(&block->ccw_queue)) | |
1952 | return; | |
1953 | /* We allways begin with the first requests on the queue, as some | |
1954 | * of previously started requests have to be enqueued on a | |
1955 | * dasd_device again for error recovery. | |
1956 | */ | |
1957 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1958 | if (cqr->status != DASD_CQR_FILLED) | |
1959 | continue; | |
1960 | /* Non-temporary stop condition will trigger fail fast */ | |
1961 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1962 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1963 | (!dasd_eer_enabled(block->base))) { | |
1964 | cqr->status = DASD_CQR_FAILED; | |
1965 | dasd_schedule_block_bh(block); | |
1966 | continue; | |
1967 | } | |
1968 | /* Don't try to start requests if device is stopped */ | |
1969 | if (block->base->stopped) | |
1970 | return; | |
1971 | ||
1972 | /* just a fail safe check, should not happen */ | |
1973 | if (!cqr->startdev) | |
1974 | cqr->startdev = block->base; | |
1975 | ||
1976 | /* make sure that the requests we submit find their way back */ | |
1977 | cqr->callback = dasd_return_cqr_cb; | |
1978 | ||
1979 | dasd_add_request_tail(cqr); | |
1980 | } | |
1981 | } | |
1982 | ||
1983 | /* | |
1984 | * Central dasd_block layer routine. Takes requests from the generic | |
1985 | * block layer request queue, creates ccw requests, enqueues them on | |
1986 | * a dasd_device and processes ccw requests that have been returned. | |
1987 | */ | |
1988 | static void dasd_block_tasklet(struct dasd_block *block) | |
1989 | { | |
1990 | struct list_head final_queue; | |
1991 | struct list_head *l, *n; | |
1992 | struct dasd_ccw_req *cqr; | |
1993 | ||
1994 | atomic_set(&block->tasklet_scheduled, 0); | |
1995 | INIT_LIST_HEAD(&final_queue); | |
1996 | spin_lock(&block->queue_lock); | |
1997 | /* Finish off requests on ccw queue */ | |
1998 | __dasd_process_block_ccw_queue(block, &final_queue); | |
1999 | spin_unlock(&block->queue_lock); | |
2000 | /* Now call the callback function of requests with final status */ | |
2001 | spin_lock_irq(&block->request_queue_lock); | |
2002 | list_for_each_safe(l, n, &final_queue) { | |
2003 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2004 | list_del_init(&cqr->blocklist); | |
2005 | __dasd_cleanup_cqr(cqr); | |
2006 | } | |
2007 | spin_lock(&block->queue_lock); | |
2008 | /* Get new request from the block device request queue */ | |
2009 | __dasd_process_request_queue(block); | |
2010 | /* Now check if the head of the ccw queue needs to be started. */ | |
2011 | __dasd_block_start_head(block); | |
2012 | spin_unlock(&block->queue_lock); | |
2013 | spin_unlock_irq(&block->request_queue_lock); | |
2014 | dasd_put_device(block->base); | |
2015 | } | |
2016 | ||
2017 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
2018 | { | |
2019 | wake_up(&dasd_flush_wq); | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Go through all request on the dasd_block request queue, cancel them | |
2024 | * on the respective dasd_device, and return them to the generic | |
2025 | * block layer. | |
2026 | */ | |
2027 | static int dasd_flush_block_queue(struct dasd_block *block) | |
2028 | { | |
2029 | struct dasd_ccw_req *cqr, *n; | |
2030 | int rc, i; | |
2031 | struct list_head flush_queue; | |
2032 | ||
2033 | INIT_LIST_HEAD(&flush_queue); | |
2034 | spin_lock_bh(&block->queue_lock); | |
2035 | rc = 0; | |
2036 | restart: | |
2037 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
2038 | /* if this request currently owned by a dasd_device cancel it */ | |
2039 | if (cqr->status >= DASD_CQR_QUEUED) | |
2040 | rc = dasd_cancel_req(cqr); | |
2041 | if (rc < 0) | |
2042 | break; | |
2043 | /* Rechain request (including erp chain) so it won't be | |
2044 | * touched by the dasd_block_tasklet anymore. | |
2045 | * Replace the callback so we notice when the request | |
2046 | * is returned from the dasd_device layer. | |
2047 | */ | |
2048 | cqr->callback = _dasd_wake_block_flush_cb; | |
2049 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
2050 | list_move_tail(&cqr->blocklist, &flush_queue); | |
2051 | if (i > 1) | |
2052 | /* moved more than one request - need to restart */ | |
2053 | goto restart; | |
2054 | } | |
2055 | spin_unlock_bh(&block->queue_lock); | |
2056 | /* Now call the callback function of flushed requests */ | |
2057 | restart_cb: | |
2058 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
2059 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
2060 | /* Process finished ERP request. */ | |
2061 | if (cqr->refers) { | |
0cd4bd47 | 2062 | spin_lock_bh(&block->queue_lock); |
eb6e199b | 2063 | __dasd_process_erp(block->base, cqr); |
0cd4bd47 | 2064 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
2065 | /* restart list_for_xx loop since dasd_process_erp |
2066 | * might remove multiple elements */ | |
2067 | goto restart_cb; | |
2068 | } | |
2069 | /* call the callback function */ | |
0cd4bd47 | 2070 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
2071 | cqr->endclk = get_clock(); |
2072 | list_del_init(&cqr->blocklist); | |
2073 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 2074 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 2075 | } |
1da177e4 LT |
2076 | return rc; |
2077 | } | |
2078 | ||
2079 | /* | |
8e09f215 SW |
2080 | * Schedules a call to dasd_tasklet over the device tasklet. |
2081 | */ | |
2082 | void dasd_schedule_block_bh(struct dasd_block *block) | |
2083 | { | |
2084 | /* Protect against rescheduling. */ | |
2085 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
2086 | return; | |
2087 | /* life cycle of block is bound to it's base device */ | |
2088 | dasd_get_device(block->base); | |
2089 | tasklet_hi_schedule(&block->tasklet); | |
2090 | } | |
2091 | ||
2092 | ||
2093 | /* | |
2094 | * SECTION: external block device operations | |
2095 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
2096 | */ |
2097 | ||
2098 | /* | |
2099 | * Dasd request queue function. Called from ll_rw_blk.c | |
2100 | */ | |
8e09f215 | 2101 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 2102 | { |
8e09f215 | 2103 | struct dasd_block *block; |
1da177e4 | 2104 | |
8e09f215 SW |
2105 | block = queue->queuedata; |
2106 | spin_lock(&block->queue_lock); | |
1da177e4 | 2107 | /* Get new request from the block device request queue */ |
8e09f215 | 2108 | __dasd_process_request_queue(block); |
1da177e4 | 2109 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2110 | __dasd_block_start_head(block); |
2111 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
2112 | } |
2113 | ||
2114 | /* | |
2115 | * Allocate and initialize request queue and default I/O scheduler. | |
2116 | */ | |
8e09f215 | 2117 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
2118 | { |
2119 | int rc; | |
2120 | ||
8e09f215 SW |
2121 | block->request_queue = blk_init_queue(do_dasd_request, |
2122 | &block->request_queue_lock); | |
2123 | if (block->request_queue == NULL) | |
1da177e4 LT |
2124 | return -ENOMEM; |
2125 | ||
8e09f215 | 2126 | block->request_queue->queuedata = block; |
1da177e4 | 2127 | |
8e09f215 | 2128 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 2129 | block->request_queue->elevator = NULL; |
8e09f215 | 2130 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 2131 | if (rc) { |
8e09f215 | 2132 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
2133 | return rc; |
2134 | } | |
2135 | return 0; | |
2136 | } | |
2137 | ||
2138 | /* | |
2139 | * Allocate and initialize request queue. | |
2140 | */ | |
8e09f215 | 2141 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
2142 | { |
2143 | int max; | |
2144 | ||
e1defc4f | 2145 | blk_queue_logical_block_size(block->request_queue, block->bp_block); |
8e09f215 | 2146 | max = block->base->discipline->max_blocks << block->s2b_shift; |
086fa5ff | 2147 | blk_queue_max_hw_sectors(block->request_queue, max); |
8a78362c | 2148 | blk_queue_max_segments(block->request_queue, -1L); |
f3eb5384 SW |
2149 | /* with page sized segments we can translate each segement into |
2150 | * one idaw/tidaw | |
2151 | */ | |
2152 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
2153 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
8e09f215 | 2154 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); |
1da177e4 LT |
2155 | } |
2156 | ||
2157 | /* | |
2158 | * Deactivate and free request queue. | |
2159 | */ | |
8e09f215 | 2160 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2161 | { |
8e09f215 SW |
2162 | if (block->request_queue) { |
2163 | blk_cleanup_queue(block->request_queue); | |
2164 | block->request_queue = NULL; | |
1da177e4 LT |
2165 | } |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * Flush request on the request queue. | |
2170 | */ | |
8e09f215 | 2171 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2172 | { |
2173 | struct request *req; | |
2174 | ||
8e09f215 | 2175 | if (!block->request_queue) |
1da177e4 | 2176 | return; |
138c014d | 2177 | |
8e09f215 | 2178 | spin_lock_irq(&block->request_queue_lock); |
9934c8c0 | 2179 | while ((req = blk_fetch_request(block->request_queue))) |
40cbbb78 | 2180 | __blk_end_request_all(req, -EIO); |
8e09f215 | 2181 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2182 | } |
2183 | ||
57a7c0bc | 2184 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2185 | { |
57a7c0bc | 2186 | struct dasd_block *block = bdev->bd_disk->private_data; |
9eb25122 | 2187 | struct dasd_device *base; |
1da177e4 LT |
2188 | int rc; |
2189 | ||
9eb25122 SH |
2190 | if (!block) |
2191 | return -ENODEV; | |
2192 | ||
2193 | base = block->base; | |
8e09f215 SW |
2194 | atomic_inc(&block->open_count); |
2195 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2196 | rc = -ENODEV; |
2197 | goto unlock; | |
2198 | } | |
2199 | ||
8e09f215 | 2200 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2201 | rc = -EINVAL; |
2202 | goto unlock; | |
2203 | } | |
2204 | ||
2205 | if (dasd_probeonly) { | |
fc19f381 SH |
2206 | dev_info(&base->cdev->dev, |
2207 | "Accessing the DASD failed because it is in " | |
2208 | "probeonly mode\n"); | |
1da177e4 LT |
2209 | rc = -EPERM; |
2210 | goto out; | |
2211 | } | |
2212 | ||
8e09f215 SW |
2213 | if (base->state <= DASD_STATE_BASIC) { |
2214 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2215 | " Cannot open unrecognized device"); |
2216 | rc = -ENODEV; | |
2217 | goto out; | |
2218 | } | |
2219 | ||
33b62a30 SW |
2220 | if ((mode & FMODE_WRITE) && |
2221 | (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || | |
2222 | (base->features & DASD_FEATURE_READONLY))) { | |
2223 | rc = -EROFS; | |
2224 | goto out; | |
2225 | } | |
2226 | ||
1da177e4 LT |
2227 | return 0; |
2228 | ||
2229 | out: | |
8e09f215 | 2230 | module_put(base->discipline->owner); |
1da177e4 | 2231 | unlock: |
8e09f215 | 2232 | atomic_dec(&block->open_count); |
1da177e4 LT |
2233 | return rc; |
2234 | } | |
2235 | ||
57a7c0bc | 2236 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2237 | { |
8e09f215 | 2238 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2239 | |
8e09f215 SW |
2240 | atomic_dec(&block->open_count); |
2241 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2242 | return 0; |
2243 | } | |
2244 | ||
a885c8c4 CH |
2245 | /* |
2246 | * Return disk geometry. | |
2247 | */ | |
8e09f215 | 2248 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2249 | { |
8e09f215 SW |
2250 | struct dasd_block *block; |
2251 | struct dasd_device *base; | |
a885c8c4 | 2252 | |
8e09f215 | 2253 | block = bdev->bd_disk->private_data; |
8e09f215 | 2254 | if (!block) |
a885c8c4 | 2255 | return -ENODEV; |
cf05b824 | 2256 | base = block->base; |
a885c8c4 | 2257 | |
8e09f215 SW |
2258 | if (!base->discipline || |
2259 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2260 | return -EINVAL; |
2261 | ||
8e09f215 SW |
2262 | base->discipline->fill_geometry(block, geo); |
2263 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2264 | return 0; |
2265 | } | |
2266 | ||
83d5cde4 | 2267 | const struct block_device_operations |
1da177e4 LT |
2268 | dasd_device_operations = { |
2269 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2270 | .open = dasd_open, |
2271 | .release = dasd_release, | |
0000d031 HC |
2272 | .ioctl = dasd_ioctl, |
2273 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 2274 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2275 | }; |
2276 | ||
8e09f215 SW |
2277 | /******************************************************************************* |
2278 | * end of block device operations | |
2279 | */ | |
1da177e4 LT |
2280 | |
2281 | static void | |
2282 | dasd_exit(void) | |
2283 | { | |
2284 | #ifdef CONFIG_PROC_FS | |
2285 | dasd_proc_exit(); | |
2286 | #endif | |
20c64468 | 2287 | dasd_eer_exit(); |
6bb0e010 HH |
2288 | if (dasd_page_cache != NULL) { |
2289 | kmem_cache_destroy(dasd_page_cache); | |
2290 | dasd_page_cache = NULL; | |
2291 | } | |
1da177e4 LT |
2292 | dasd_gendisk_exit(); |
2293 | dasd_devmap_exit(); | |
1da177e4 LT |
2294 | if (dasd_debug_area != NULL) { |
2295 | debug_unregister(dasd_debug_area); | |
2296 | dasd_debug_area = NULL; | |
2297 | } | |
2298 | } | |
2299 | ||
2300 | /* | |
2301 | * SECTION: common functions for ccw_driver use | |
2302 | */ | |
2303 | ||
33b62a30 SW |
2304 | /* |
2305 | * Is the device read-only? | |
2306 | * Note that this function does not report the setting of the | |
2307 | * readonly device attribute, but how it is configured in z/VM. | |
2308 | */ | |
2309 | int dasd_device_is_ro(struct dasd_device *device) | |
2310 | { | |
2311 | struct ccw_dev_id dev_id; | |
2312 | struct diag210 diag_data; | |
2313 | int rc; | |
2314 | ||
2315 | if (!MACHINE_IS_VM) | |
2316 | return 0; | |
2317 | ccw_device_get_id(device->cdev, &dev_id); | |
2318 | memset(&diag_data, 0, sizeof(diag_data)); | |
2319 | diag_data.vrdcdvno = dev_id.devno; | |
2320 | diag_data.vrdclen = sizeof(diag_data); | |
2321 | rc = diag210(&diag_data); | |
2322 | if (rc == 0 || rc == 2) { | |
2323 | return diag_data.vrdcvfla & 0x80; | |
2324 | } else { | |
2325 | DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", | |
2326 | dev_id.devno, rc); | |
2327 | return 0; | |
2328 | } | |
2329 | } | |
2330 | EXPORT_SYMBOL_GPL(dasd_device_is_ro); | |
2331 | ||
f3445a1a CH |
2332 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
2333 | { | |
2334 | struct ccw_device *cdev = data; | |
2335 | int ret; | |
2336 | ||
2337 | ret = ccw_device_set_online(cdev); | |
2338 | if (ret) | |
2339 | pr_warning("%s: Setting the DASD online failed with rc=%d\n", | |
2340 | dev_name(&cdev->dev), ret); | |
f3445a1a CH |
2341 | } |
2342 | ||
1c01b8a5 HH |
2343 | /* |
2344 | * Initial attempt at a probe function. this can be simplified once | |
2345 | * the other detection code is gone. | |
2346 | */ | |
8e09f215 SW |
2347 | int dasd_generic_probe(struct ccw_device *cdev, |
2348 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2349 | { |
2350 | int ret; | |
2351 | ||
2352 | ret = dasd_add_sysfs_files(cdev); | |
2353 | if (ret) { | |
b8ed5dd5 SH |
2354 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", |
2355 | "dasd_generic_probe: could not add " | |
2356 | "sysfs entries"); | |
40545573 | 2357 | return ret; |
1da177e4 | 2358 | } |
40545573 | 2359 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2360 | |
40545573 HH |
2361 | /* |
2362 | * Automatically online either all dasd devices (dasd_autodetect) | |
2363 | * or all devices specified with dasd= parameters during | |
2364 | * initial probe. | |
2365 | */ | |
2366 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2367 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 2368 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 2369 | return 0; |
1da177e4 LT |
2370 | } |
2371 | ||
1c01b8a5 HH |
2372 | /* |
2373 | * This will one day be called from a global not_oper handler. | |
2374 | * It is also used by driver_unregister during module unload. | |
2375 | */ | |
8e09f215 | 2376 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2377 | { |
2378 | struct dasd_device *device; | |
8e09f215 | 2379 | struct dasd_block *block; |
1da177e4 | 2380 | |
59afda78 HH |
2381 | cdev->handler = NULL; |
2382 | ||
1da177e4 LT |
2383 | dasd_remove_sysfs_files(cdev); |
2384 | device = dasd_device_from_cdev(cdev); | |
2385 | if (IS_ERR(device)) | |
2386 | return; | |
2387 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2388 | /* Already doing offline processing */ | |
2389 | dasd_put_device(device); | |
2390 | return; | |
2391 | } | |
2392 | /* | |
2393 | * This device is removed unconditionally. Set offline | |
2394 | * flag to prevent dasd_open from opening it while it is | |
2395 | * no quite down yet. | |
2396 | */ | |
2397 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2398 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2399 | block = device->block; |
2400 | device->block = NULL; | |
1da177e4 | 2401 | dasd_delete_device(device); |
8e09f215 SW |
2402 | /* |
2403 | * life cycle of block is bound to device, so delete it after | |
2404 | * device was safely removed | |
2405 | */ | |
2406 | if (block) | |
2407 | dasd_free_block(block); | |
1da177e4 LT |
2408 | } |
2409 | ||
1c01b8a5 HH |
2410 | /* |
2411 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2412 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2413 | * or the user has started activation through sysfs. |
2414 | */ | |
8e09f215 SW |
2415 | int dasd_generic_set_online(struct ccw_device *cdev, |
2416 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2417 | { |
aa88861f | 2418 | struct dasd_discipline *discipline; |
1da177e4 | 2419 | struct dasd_device *device; |
c6eb7b77 | 2420 | int rc; |
f24acd45 | 2421 | |
40545573 HH |
2422 | /* first online clears initial online feature flag */ |
2423 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2424 | device = dasd_create_device(cdev); |
2425 | if (IS_ERR(device)) | |
2426 | return PTR_ERR(device); | |
2427 | ||
aa88861f | 2428 | discipline = base_discipline; |
c6eb7b77 | 2429 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 2430 | if (!dasd_diag_discipline_pointer) { |
fc19f381 SH |
2431 | pr_warning("%s Setting the DASD online failed because " |
2432 | "of missing DIAG discipline\n", | |
2433 | dev_name(&cdev->dev)); | |
1da177e4 LT |
2434 | dasd_delete_device(device); |
2435 | return -ENODEV; | |
2436 | } | |
2437 | discipline = dasd_diag_discipline_pointer; | |
2438 | } | |
aa88861f PO |
2439 | if (!try_module_get(base_discipline->owner)) { |
2440 | dasd_delete_device(device); | |
2441 | return -EINVAL; | |
2442 | } | |
2443 | if (!try_module_get(discipline->owner)) { | |
2444 | module_put(base_discipline->owner); | |
2445 | dasd_delete_device(device); | |
2446 | return -EINVAL; | |
2447 | } | |
2448 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2449 | device->discipline = discipline; |
2450 | ||
8e09f215 | 2451 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2452 | rc = discipline->check_device(device); |
2453 | if (rc) { | |
fc19f381 SH |
2454 | pr_warning("%s Setting the DASD online with discipline %s " |
2455 | "failed with rc=%i\n", | |
2456 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
2457 | module_put(discipline->owner); |
2458 | module_put(base_discipline->owner); | |
1da177e4 LT |
2459 | dasd_delete_device(device); |
2460 | return rc; | |
2461 | } | |
2462 | ||
2463 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2464 | if (device->state <= DASD_STATE_KNOWN) { | |
fc19f381 SH |
2465 | pr_warning("%s Setting the DASD online failed because of a " |
2466 | "missing discipline\n", dev_name(&cdev->dev)); | |
1da177e4 LT |
2467 | rc = -ENODEV; |
2468 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2469 | if (device->block) |
2470 | dasd_free_block(device->block); | |
1da177e4 LT |
2471 | dasd_delete_device(device); |
2472 | } else | |
2473 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2474 | dev_name(&cdev->dev)); |
589c74d5 SH |
2475 | |
2476 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2477 | ||
1da177e4 | 2478 | dasd_put_device(device); |
1da177e4 LT |
2479 | return rc; |
2480 | } | |
2481 | ||
8e09f215 | 2482 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2483 | { |
2484 | struct dasd_device *device; | |
8e09f215 | 2485 | struct dasd_block *block; |
dafd87aa | 2486 | int max_count, open_count; |
1da177e4 LT |
2487 | |
2488 | device = dasd_device_from_cdev(cdev); | |
2489 | if (IS_ERR(device)) | |
2490 | return PTR_ERR(device); | |
2491 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2492 | /* Already doing offline processing */ | |
2493 | dasd_put_device(device); | |
2494 | return 0; | |
2495 | } | |
2496 | /* | |
2497 | * We must make sure that this device is currently not in use. | |
2498 | * The open_count is increased for every opener, that includes | |
2499 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2500 | * in the other openers. | |
2501 | */ | |
8e09f215 | 2502 | if (device->block) { |
a806170e HC |
2503 | max_count = device->block->bdev ? 0 : -1; |
2504 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2505 | if (open_count > max_count) { |
2506 | if (open_count > 0) | |
fc19f381 SH |
2507 | pr_warning("%s: The DASD cannot be set offline " |
2508 | "with open count %i\n", | |
2509 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 2510 | else |
fc19f381 SH |
2511 | pr_warning("%s: The DASD cannot be set offline " |
2512 | "while it is in use\n", | |
2513 | dev_name(&cdev->dev)); | |
8e09f215 SW |
2514 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2515 | dasd_put_device(device); | |
2516 | return -EBUSY; | |
2517 | } | |
1da177e4 LT |
2518 | } |
2519 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2520 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2521 | block = device->block; |
2522 | device->block = NULL; | |
1da177e4 | 2523 | dasd_delete_device(device); |
8e09f215 SW |
2524 | /* |
2525 | * life cycle of block is bound to device, so delete it after | |
2526 | * device was safely removed | |
2527 | */ | |
2528 | if (block) | |
2529 | dasd_free_block(block); | |
1da177e4 LT |
2530 | return 0; |
2531 | } | |
2532 | ||
8e09f215 | 2533 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2534 | { |
2535 | struct dasd_device *device; | |
2536 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
2537 | int ret; |
2538 | ||
91c36919 | 2539 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2540 | if (IS_ERR(device)) |
2541 | return 0; | |
1da177e4 LT |
2542 | ret = 0; |
2543 | switch (event) { | |
2544 | case CIO_GONE: | |
47593bfa | 2545 | case CIO_BOXED: |
1da177e4 | 2546 | case CIO_NO_PATH: |
20c64468 SW |
2547 | /* First of all call extended error reporting. */ |
2548 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2549 | ||
1da177e4 LT |
2550 | if (device->state < DASD_STATE_BASIC) |
2551 | break; | |
2552 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2553 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2554 | if (cqr->status == DASD_CQR_IN_IO) { | |
2555 | cqr->status = DASD_CQR_QUEUED; | |
2556 | cqr->retries++; | |
2557 | } | |
eb6e199b | 2558 | dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); |
8e09f215 SW |
2559 | dasd_device_clear_timer(device); |
2560 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2561 | ret = 1; |
2562 | break; | |
2563 | case CIO_OPER: | |
2564 | /* FIXME: add a sanity check. */ | |
eb6e199b | 2565 | dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); |
d41dd122 | 2566 | if (device->stopped & DASD_UNRESUMED_PM) { |
eb6e199b | 2567 | dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); |
d41dd122 SH |
2568 | dasd_restore_device(device); |
2569 | ret = 1; | |
2570 | break; | |
2571 | } | |
8e09f215 SW |
2572 | dasd_schedule_device_bh(device); |
2573 | if (device->block) | |
2574 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2575 | ret = 1; |
2576 | break; | |
2577 | } | |
1da177e4 LT |
2578 | dasd_put_device(device); |
2579 | return ret; | |
2580 | } | |
2581 | ||
d41dd122 SH |
2582 | int dasd_generic_pm_freeze(struct ccw_device *cdev) |
2583 | { | |
2584 | struct dasd_ccw_req *cqr, *n; | |
2585 | int rc; | |
2586 | struct list_head freeze_queue; | |
2587 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2588 | ||
2589 | if (IS_ERR(device)) | |
2590 | return PTR_ERR(device); | |
2591 | /* disallow new I/O */ | |
eb6e199b | 2592 | dasd_device_set_stop_bits(device, DASD_STOPPED_PM); |
d41dd122 SH |
2593 | /* clear active requests */ |
2594 | INIT_LIST_HEAD(&freeze_queue); | |
2595 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2596 | rc = 0; | |
2597 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { | |
2598 | /* Check status and move request to flush_queue */ | |
2599 | if (cqr->status == DASD_CQR_IN_IO) { | |
2600 | rc = device->discipline->term_IO(cqr); | |
2601 | if (rc) { | |
2602 | /* unable to terminate requeust */ | |
2603 | dev_err(&device->cdev->dev, | |
2604 | "Unable to terminate request %p " | |
2605 | "on suspend\n", cqr); | |
2606 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2607 | dasd_put_device(device); | |
2608 | return rc; | |
2609 | } | |
2610 | } | |
2611 | list_move_tail(&cqr->devlist, &freeze_queue); | |
2612 | } | |
2613 | ||
2614 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2615 | ||
2616 | list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { | |
2617 | wait_event(dasd_flush_wq, | |
2618 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
2619 | if (cqr->status == DASD_CQR_CLEARED) | |
2620 | cqr->status = DASD_CQR_QUEUED; | |
2621 | } | |
2622 | /* move freeze_queue to start of the ccw_queue */ | |
2623 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2624 | list_splice_tail(&freeze_queue, &device->ccw_queue); | |
2625 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2626 | ||
2627 | if (device->discipline->freeze) | |
2628 | rc = device->discipline->freeze(device); | |
2629 | ||
2630 | dasd_put_device(device); | |
2631 | return rc; | |
2632 | } | |
2633 | EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); | |
2634 | ||
2635 | int dasd_generic_restore_device(struct ccw_device *cdev) | |
2636 | { | |
2637 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2638 | int rc = 0; | |
2639 | ||
2640 | if (IS_ERR(device)) | |
2641 | return PTR_ERR(device); | |
2642 | ||
e6125fba | 2643 | /* allow new IO again */ |
eb6e199b SW |
2644 | dasd_device_remove_stop_bits(device, |
2645 | (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); | |
e6125fba | 2646 | |
d41dd122 | 2647 | dasd_schedule_device_bh(device); |
d41dd122 | 2648 | |
eb6e199b SW |
2649 | /* |
2650 | * call discipline restore function | |
2651 | * if device is stopped do nothing e.g. for disconnected devices | |
2652 | */ | |
2653 | if (device->discipline->restore && !(device->stopped)) | |
d41dd122 | 2654 | rc = device->discipline->restore(device); |
eb6e199b | 2655 | if (rc || device->stopped) |
e6125fba SH |
2656 | /* |
2657 | * if the resume failed for the DASD we put it in | |
2658 | * an UNRESUMED stop state | |
2659 | */ | |
2660 | device->stopped |= DASD_UNRESUMED_PM; | |
d41dd122 | 2661 | |
6fca97a9 SH |
2662 | if (device->block) |
2663 | dasd_schedule_block_bh(device->block); | |
2664 | ||
d41dd122 | 2665 | dasd_put_device(device); |
e6125fba | 2666 | return 0; |
d41dd122 SH |
2667 | } |
2668 | EXPORT_SYMBOL_GPL(dasd_generic_restore_device); | |
2669 | ||
763968e2 HC |
2670 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2671 | void *rdc_buffer, | |
2672 | int rdc_buffer_size, | |
68b781fe | 2673 | int magic) |
17283b56 CH |
2674 | { |
2675 | struct dasd_ccw_req *cqr; | |
2676 | struct ccw1 *ccw; | |
d9fa9441 | 2677 | unsigned long *idaw; |
17283b56 CH |
2678 | |
2679 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2680 | ||
2681 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
2682 | /* internal error 13 - Allocating the RDC request failed*/ |
2683 | dev_err(&device->cdev->dev, | |
2684 | "An error occurred in the DASD device driver, " | |
2685 | "reason=%s\n", "13"); | |
17283b56 CH |
2686 | return cqr; |
2687 | } | |
2688 | ||
2689 | ccw = cqr->cpaddr; | |
2690 | ccw->cmd_code = CCW_CMD_RDC; | |
d9fa9441 SH |
2691 | if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { |
2692 | idaw = (unsigned long *) (cqr->data); | |
2693 | ccw->cda = (__u32)(addr_t) idaw; | |
2694 | ccw->flags = CCW_FLAG_IDA; | |
2695 | idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); | |
2696 | } else { | |
2697 | ccw->cda = (__u32)(addr_t) rdc_buffer; | |
2698 | ccw->flags = 0; | |
2699 | } | |
17283b56 | 2700 | |
d9fa9441 | 2701 | ccw->count = rdc_buffer_size; |
8e09f215 SW |
2702 | cqr->startdev = device; |
2703 | cqr->memdev = device; | |
17283b56 | 2704 | cqr->expires = 10*HZ; |
eb6e199b | 2705 | cqr->retries = 256; |
17283b56 CH |
2706 | cqr->buildclk = get_clock(); |
2707 | cqr->status = DASD_CQR_FILLED; | |
2708 | return cqr; | |
2709 | } | |
2710 | ||
2711 | ||
68b781fe | 2712 | int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
92636b15 | 2713 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
2714 | { |
2715 | int ret; | |
2716 | struct dasd_ccw_req *cqr; | |
2717 | ||
92636b15 | 2718 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
2719 | magic); |
2720 | if (IS_ERR(cqr)) | |
2721 | return PTR_ERR(cqr); | |
2722 | ||
2723 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2724 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2725 | return ret; |
2726 | } | |
aaff0f64 | 2727 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2728 | |
f3eb5384 SW |
2729 | /* |
2730 | * In command mode and transport mode we need to look for sense | |
2731 | * data in different places. The sense data itself is allways | |
2732 | * an array of 32 bytes, so we can unify the sense data access | |
2733 | * for both modes. | |
2734 | */ | |
2735 | char *dasd_get_sense(struct irb *irb) | |
2736 | { | |
2737 | struct tsb *tsb = NULL; | |
2738 | char *sense = NULL; | |
2739 | ||
2740 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
2741 | if (irb->scsw.tm.tcw) | |
2742 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
2743 | irb->scsw.tm.tcw); | |
2744 | if (tsb && tsb->length == 64 && tsb->flags) | |
2745 | switch (tsb->flags & 0x07) { | |
2746 | case 1: /* tsa_iostat */ | |
2747 | sense = tsb->tsa.iostat.sense; | |
2748 | break; | |
2749 | case 2: /* tsa_ddpc */ | |
2750 | sense = tsb->tsa.ddpc.sense; | |
2751 | break; | |
2752 | default: | |
2753 | /* currently we don't use interrogate data */ | |
2754 | break; | |
2755 | } | |
2756 | } else if (irb->esw.esw0.erw.cons) { | |
2757 | sense = irb->ecw; | |
2758 | } | |
2759 | return sense; | |
2760 | } | |
2761 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
2762 | ||
8e09f215 | 2763 | static int __init dasd_init(void) |
1da177e4 LT |
2764 | { |
2765 | int rc; | |
2766 | ||
2767 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2768 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2769 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2770 | |
2771 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2772 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2773 | if (dasd_debug_area == NULL) { |
2774 | rc = -ENOMEM; | |
2775 | goto failed; | |
2776 | } | |
2777 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2778 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2779 | |
2780 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2781 | ||
2782 | dasd_diag_discipline_pointer = NULL; | |
2783 | ||
1da177e4 LT |
2784 | rc = dasd_devmap_init(); |
2785 | if (rc) | |
2786 | goto failed; | |
2787 | rc = dasd_gendisk_init(); | |
2788 | if (rc) | |
2789 | goto failed; | |
2790 | rc = dasd_parse(); | |
2791 | if (rc) | |
2792 | goto failed; | |
20c64468 SW |
2793 | rc = dasd_eer_init(); |
2794 | if (rc) | |
2795 | goto failed; | |
1da177e4 LT |
2796 | #ifdef CONFIG_PROC_FS |
2797 | rc = dasd_proc_init(); | |
2798 | if (rc) | |
2799 | goto failed; | |
2800 | #endif | |
2801 | ||
2802 | return 0; | |
2803 | failed: | |
fc19f381 | 2804 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
2805 | dasd_exit(); |
2806 | return rc; | |
2807 | } | |
2808 | ||
2809 | module_init(dasd_init); | |
2810 | module_exit(dasd_exit); | |
2811 | ||
2812 | EXPORT_SYMBOL(dasd_debug_area); | |
2813 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2814 | ||
2815 | EXPORT_SYMBOL(dasd_add_request_head); | |
2816 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2817 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2818 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2819 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2820 | EXPORT_SYMBOL(dasd_enable_device); |
2821 | EXPORT_SYMBOL(dasd_int_handler); | |
2822 | EXPORT_SYMBOL(dasd_kfree_request); | |
2823 | EXPORT_SYMBOL(dasd_kick_device); | |
2824 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2825 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2826 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2827 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2828 | EXPORT_SYMBOL(dasd_device_set_timer); |
2829 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2830 | EXPORT_SYMBOL(dasd_sfree_request); |
2831 | EXPORT_SYMBOL(dasd_sleep_on); | |
2832 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2833 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2834 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2835 | EXPORT_SYMBOL(dasd_start_IO); | |
2836 | EXPORT_SYMBOL(dasd_term_IO); | |
2837 | ||
2838 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2839 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2840 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2841 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2842 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2843 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2844 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2845 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2846 | EXPORT_SYMBOL_GPL(dasd_free_block); |