Commit | Line | Data |
---|---|---|
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> | |
8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/kmod.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/ctype.h> | |
16 | #include <linux/major.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/buffer_head.h> | |
a885c8c4 | 19 | #include <linux/hdreg.h> |
1da177e4 LT |
20 | |
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/ebcdic.h> | |
23 | #include <asm/idals.h> | |
24 | #include <asm/todclk.h> | |
25 | ||
26 | /* This is ugly... */ | |
27 | #define PRINTK_HEADER "dasd:" | |
28 | ||
29 | #include "dasd_int.h" | |
30 | /* | |
31 | * SECTION: Constant definitions to be used within this file | |
32 | */ | |
33 | #define DASD_CHANQ_MAX_SIZE 4 | |
34 | ||
35 | /* | |
36 | * SECTION: exported variables of dasd.c | |
37 | */ | |
38 | debug_info_t *dasd_debug_area; | |
39 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 40 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
41 | |
42 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
43 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
44 | " Copyright 2000 IBM Corporation"); | |
45 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
46 | MODULE_LICENSE("GPL"); |
47 | ||
48 | /* | |
49 | * SECTION: prototypes for static functions of dasd.c | |
50 | */ | |
8e09f215 SW |
51 | static int dasd_alloc_queue(struct dasd_block *); |
52 | static void dasd_setup_queue(struct dasd_block *); | |
53 | static void dasd_free_queue(struct dasd_block *); | |
54 | static void dasd_flush_request_queue(struct dasd_block *); | |
55 | static int dasd_flush_block_queue(struct dasd_block *); | |
56 | static void dasd_device_tasklet(struct dasd_device *); | |
57 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 58 | static void do_kick_device(struct work_struct *); |
8e09f215 | 59 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
1da177e4 LT |
60 | |
61 | /* | |
62 | * SECTION: Operations on the device structure. | |
63 | */ | |
64 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 65 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 66 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
67 | |
68 | /* | |
69 | * Allocate memory for a new device structure. | |
70 | */ | |
8e09f215 | 71 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
72 | { |
73 | struct dasd_device *device; | |
74 | ||
8e09f215 SW |
75 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
76 | if (!device) | |
1da177e4 | 77 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
78 | |
79 | /* Get two pages for normal block device operations. */ | |
80 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 81 | if (!device->ccw_mem) { |
1da177e4 LT |
82 | kfree(device); |
83 | return ERR_PTR(-ENOMEM); | |
84 | } | |
85 | /* Get one page for error recovery. */ | |
86 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 87 | if (!device->erp_mem) { |
1da177e4 LT |
88 | free_pages((unsigned long) device->ccw_mem, 1); |
89 | kfree(device); | |
90 | return ERR_PTR(-ENOMEM); | |
91 | } | |
92 | ||
93 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
94 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
95 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 96 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 97 | tasklet_init(&device->tasklet, |
8e09f215 | 98 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
99 | (unsigned long) device); |
100 | INIT_LIST_HEAD(&device->ccw_queue); | |
101 | init_timer(&device->timer); | |
4927b3f7 | 102 | INIT_WORK(&device->kick_work, do_kick_device); |
1da177e4 LT |
103 | device->state = DASD_STATE_NEW; |
104 | device->target = DASD_STATE_NEW; | |
105 | ||
106 | return device; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Free memory of a device structure. | |
111 | */ | |
8e09f215 | 112 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 113 | { |
17fd682e | 114 | kfree(device->private); |
1da177e4 LT |
115 | free_page((unsigned long) device->erp_mem); |
116 | free_pages((unsigned long) device->ccw_mem, 1); | |
117 | kfree(device); | |
118 | } | |
119 | ||
8e09f215 SW |
120 | /* |
121 | * Allocate memory for a new device structure. | |
122 | */ | |
123 | struct dasd_block *dasd_alloc_block(void) | |
124 | { | |
125 | struct dasd_block *block; | |
126 | ||
127 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
128 | if (!block) | |
129 | return ERR_PTR(-ENOMEM); | |
130 | /* open_count = 0 means device online but not in use */ | |
131 | atomic_set(&block->open_count, -1); | |
132 | ||
133 | spin_lock_init(&block->request_queue_lock); | |
134 | atomic_set(&block->tasklet_scheduled, 0); | |
135 | tasklet_init(&block->tasklet, | |
136 | (void (*)(unsigned long)) dasd_block_tasklet, | |
137 | (unsigned long) block); | |
138 | INIT_LIST_HEAD(&block->ccw_queue); | |
139 | spin_lock_init(&block->queue_lock); | |
140 | init_timer(&block->timer); | |
141 | ||
142 | return block; | |
143 | } | |
144 | ||
145 | /* | |
146 | * Free memory of a device structure. | |
147 | */ | |
148 | void dasd_free_block(struct dasd_block *block) | |
149 | { | |
150 | kfree(block); | |
151 | } | |
152 | ||
1da177e4 LT |
153 | /* |
154 | * Make a new device known to the system. | |
155 | */ | |
8e09f215 | 156 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
157 | { |
158 | int rc; | |
159 | ||
160 | /* | |
138c014d | 161 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
162 | * keep the reference count > 0. |
163 | */ | |
164 | dasd_get_device(device); | |
165 | ||
8e09f215 SW |
166 | if (device->block) { |
167 | rc = dasd_alloc_queue(device->block); | |
168 | if (rc) { | |
169 | dasd_put_device(device); | |
170 | return rc; | |
171 | } | |
1da177e4 | 172 | } |
1da177e4 LT |
173 | device->state = DASD_STATE_KNOWN; |
174 | return 0; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Let the system forget about a device. | |
179 | */ | |
8e09f215 | 180 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 181 | { |
20c64468 SW |
182 | /* Disable extended error reporting for this device. */ |
183 | dasd_eer_disable(device); | |
1da177e4 | 184 | /* Forget the discipline information. */ |
8e09f215 SW |
185 | if (device->discipline) { |
186 | if (device->discipline->uncheck_device) | |
187 | device->discipline->uncheck_device(device); | |
aa88861f | 188 | module_put(device->discipline->owner); |
8e09f215 | 189 | } |
1da177e4 | 190 | device->discipline = NULL; |
aa88861f PO |
191 | if (device->base_discipline) |
192 | module_put(device->base_discipline->owner); | |
193 | device->base_discipline = NULL; | |
1da177e4 LT |
194 | device->state = DASD_STATE_NEW; |
195 | ||
8e09f215 SW |
196 | if (device->block) |
197 | dasd_free_queue(device->block); | |
1da177e4 LT |
198 | |
199 | /* Give up reference we took in dasd_state_new_to_known. */ | |
200 | dasd_put_device(device); | |
8f61701b | 201 | return 0; |
1da177e4 LT |
202 | } |
203 | ||
204 | /* | |
205 | * Request the irq line for the device. | |
206 | */ | |
8e09f215 | 207 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
208 | { |
209 | int rc; | |
210 | ||
211 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
212 | if (device->block) { |
213 | rc = dasd_gendisk_alloc(device->block); | |
214 | if (rc) | |
215 | return rc; | |
216 | } | |
1da177e4 | 217 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
2a0217d5 | 218 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 1, 1, |
8e09f215 | 219 | 8 * sizeof(long)); |
1da177e4 | 220 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 221 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
222 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
223 | ||
224 | device->state = DASD_STATE_BASIC; | |
225 | return 0; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Release the irq line for the device. Terminate any running i/o. | |
230 | */ | |
8e09f215 | 231 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 232 | { |
8f61701b | 233 | int rc; |
8e09f215 SW |
234 | if (device->block) { |
235 | dasd_gendisk_free(device->block); | |
236 | dasd_block_clear_timer(device->block); | |
237 | } | |
238 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
239 | if (rc) |
240 | return rc; | |
8e09f215 | 241 | dasd_device_clear_timer(device); |
8f61701b | 242 | |
1da177e4 LT |
243 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
244 | if (device->debug_area != NULL) { | |
245 | debug_unregister(device->debug_area); | |
246 | device->debug_area = NULL; | |
247 | } | |
248 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 249 | return 0; |
1da177e4 LT |
250 | } |
251 | ||
252 | /* | |
253 | * Do the initial analysis. The do_analysis function may return | |
254 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
255 | * until the discipline decides to continue the startup sequence | |
256 | * by calling the function dasd_change_state. The eckd disciplines | |
257 | * uses this to start a ccw that detects the format. The completion | |
258 | * interrupt for this detection ccw uses the kernel event daemon to | |
259 | * trigger the call to dasd_change_state. All this is done in the | |
260 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
261 | * After the analysis ccw is done (do_analysis returned 0) the block |
262 | * device is setup. | |
263 | * In case the analysis returns an error, the device setup is stopped | |
264 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 265 | */ |
8e09f215 | 266 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
267 | { |
268 | int rc; | |
8e09f215 | 269 | struct dasd_block *block; |
1da177e4 LT |
270 | |
271 | rc = 0; | |
8e09f215 | 272 | block = device->block; |
90f0094d | 273 | /* make disk known with correct capacity */ |
8e09f215 SW |
274 | if (block) { |
275 | if (block->base->discipline->do_analysis != NULL) | |
276 | rc = block->base->discipline->do_analysis(block); | |
277 | if (rc) { | |
278 | if (rc != -EAGAIN) | |
279 | device->state = DASD_STATE_UNFMT; | |
280 | return rc; | |
281 | } | |
282 | dasd_setup_queue(block); | |
283 | set_capacity(block->gdp, | |
284 | block->blocks << block->s2b_shift); | |
285 | device->state = DASD_STATE_READY; | |
286 | rc = dasd_scan_partitions(block); | |
287 | if (rc) | |
288 | device->state = DASD_STATE_BASIC; | |
289 | } else { | |
290 | device->state = DASD_STATE_READY; | |
291 | } | |
90f0094d | 292 | return rc; |
1da177e4 LT |
293 | } |
294 | ||
295 | /* | |
296 | * Remove device from block device layer. Destroy dirty buffers. | |
297 | * Forget format information. Check if the target level is basic | |
298 | * and if it is create fake disk for formatting. | |
299 | */ | |
8e09f215 | 300 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 301 | { |
8f61701b HH |
302 | int rc; |
303 | ||
1da177e4 | 304 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
305 | if (device->block) { |
306 | struct dasd_block *block = device->block; | |
307 | rc = dasd_flush_block_queue(block); | |
308 | if (rc) { | |
309 | device->state = DASD_STATE_READY; | |
310 | return rc; | |
311 | } | |
312 | dasd_destroy_partitions(block); | |
313 | dasd_flush_request_queue(block); | |
314 | block->blocks = 0; | |
315 | block->bp_block = 0; | |
316 | block->s2b_shift = 0; | |
317 | } | |
8f61701b | 318 | return 0; |
1da177e4 LT |
319 | } |
320 | ||
90f0094d HH |
321 | /* |
322 | * Back to basic. | |
323 | */ | |
8e09f215 | 324 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
325 | { |
326 | device->state = DASD_STATE_BASIC; | |
8f61701b | 327 | return 0; |
90f0094d HH |
328 | } |
329 | ||
1da177e4 LT |
330 | /* |
331 | * Make the device online and schedule the bottom half to start | |
332 | * the requeueing of requests from the linux request queue to the | |
333 | * ccw queue. | |
334 | */ | |
8f61701b | 335 | static int |
1da177e4 LT |
336 | dasd_state_ready_to_online(struct dasd_device * device) |
337 | { | |
8e09f215 | 338 | int rc; |
1301809b SW |
339 | struct gendisk *disk; |
340 | struct disk_part_iter piter; | |
341 | struct hd_struct *part; | |
8e09f215 SW |
342 | |
343 | if (device->discipline->ready_to_online) { | |
344 | rc = device->discipline->ready_to_online(device); | |
345 | if (rc) | |
346 | return rc; | |
347 | } | |
1da177e4 | 348 | device->state = DASD_STATE_ONLINE; |
1301809b | 349 | if (device->block) { |
8e09f215 | 350 | dasd_schedule_block_bh(device->block); |
1301809b SW |
351 | disk = device->block->bdev->bd_disk; |
352 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
353 | while ((part = disk_part_iter_next(&piter))) | |
354 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
355 | disk_part_iter_exit(&piter); | |
356 | } | |
1da177e4 LT |
357 | return 0; |
358 | } | |
359 | ||
360 | /* | |
361 | * Stop the requeueing of requests again. | |
362 | */ | |
8e09f215 | 363 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 364 | { |
8e09f215 | 365 | int rc; |
1301809b SW |
366 | struct gendisk *disk; |
367 | struct disk_part_iter piter; | |
368 | struct hd_struct *part; | |
8e09f215 SW |
369 | |
370 | if (device->discipline->online_to_ready) { | |
371 | rc = device->discipline->online_to_ready(device); | |
372 | if (rc) | |
373 | return rc; | |
374 | } | |
1da177e4 | 375 | device->state = DASD_STATE_READY; |
1301809b SW |
376 | if (device->block) { |
377 | disk = device->block->bdev->bd_disk; | |
378 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
379 | while ((part = disk_part_iter_next(&piter))) | |
380 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
381 | disk_part_iter_exit(&piter); | |
382 | } | |
8f61701b | 383 | return 0; |
1da177e4 LT |
384 | } |
385 | ||
386 | /* | |
387 | * Device startup state changes. | |
388 | */ | |
8e09f215 | 389 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
390 | { |
391 | int rc; | |
392 | ||
393 | rc = 0; | |
394 | if (device->state == DASD_STATE_NEW && | |
395 | device->target >= DASD_STATE_KNOWN) | |
396 | rc = dasd_state_new_to_known(device); | |
397 | ||
398 | if (!rc && | |
399 | device->state == DASD_STATE_KNOWN && | |
400 | device->target >= DASD_STATE_BASIC) | |
401 | rc = dasd_state_known_to_basic(device); | |
402 | ||
403 | if (!rc && | |
404 | device->state == DASD_STATE_BASIC && | |
405 | device->target >= DASD_STATE_READY) | |
406 | rc = dasd_state_basic_to_ready(device); | |
407 | ||
39ccf95e HH |
408 | if (!rc && |
409 | device->state == DASD_STATE_UNFMT && | |
410 | device->target > DASD_STATE_UNFMT) | |
411 | rc = -EPERM; | |
412 | ||
1da177e4 LT |
413 | if (!rc && |
414 | device->state == DASD_STATE_READY && | |
415 | device->target >= DASD_STATE_ONLINE) | |
416 | rc = dasd_state_ready_to_online(device); | |
417 | ||
418 | return rc; | |
419 | } | |
420 | ||
421 | /* | |
422 | * Device shutdown state changes. | |
423 | */ | |
8e09f215 | 424 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 425 | { |
8f61701b HH |
426 | int rc; |
427 | ||
428 | rc = 0; | |
1da177e4 LT |
429 | if (device->state == DASD_STATE_ONLINE && |
430 | device->target <= DASD_STATE_READY) | |
8f61701b | 431 | rc = dasd_state_online_to_ready(device); |
138c014d | 432 | |
8f61701b HH |
433 | if (!rc && |
434 | device->state == DASD_STATE_READY && | |
1da177e4 | 435 | device->target <= DASD_STATE_BASIC) |
8f61701b | 436 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 437 | |
8f61701b HH |
438 | if (!rc && |
439 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 440 | device->target <= DASD_STATE_BASIC) |
8f61701b | 441 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 442 | |
8f61701b HH |
443 | if (!rc && |
444 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 445 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 446 | rc = dasd_state_basic_to_known(device); |
138c014d | 447 | |
8f61701b HH |
448 | if (!rc && |
449 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 450 | device->target <= DASD_STATE_NEW) |
8f61701b | 451 | rc = dasd_state_known_to_new(device); |
1da177e4 | 452 | |
8f61701b | 453 | return rc; |
1da177e4 LT |
454 | } |
455 | ||
456 | /* | |
457 | * This is the main startup/shutdown routine. | |
458 | */ | |
8e09f215 | 459 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 LT |
460 | { |
461 | int rc; | |
462 | ||
463 | if (device->state == device->target) | |
464 | /* Already where we want to go today... */ | |
465 | return; | |
466 | if (device->state < device->target) | |
467 | rc = dasd_increase_state(device); | |
468 | else | |
469 | rc = dasd_decrease_state(device); | |
470 | if (rc && rc != -EAGAIN) | |
471 | device->target = device->state; | |
472 | ||
473 | if (device->state == device->target) | |
474 | wake_up(&dasd_init_waitq); | |
4dfd5c45 HH |
475 | |
476 | /* let user-space know that the device status changed */ | |
477 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
478 | } |
479 | ||
480 | /* | |
481 | * Kick starter for devices that did not complete the startup/shutdown | |
482 | * procedure or were sleeping because of a pending state. | |
483 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
484 | * event daemon. | |
485 | */ | |
8e09f215 | 486 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 487 | { |
4927b3f7 | 488 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
1da177e4 | 489 | dasd_change_state(device); |
8e09f215 | 490 | dasd_schedule_device_bh(device); |
1da177e4 LT |
491 | dasd_put_device(device); |
492 | } | |
493 | ||
8e09f215 | 494 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
495 | { |
496 | dasd_get_device(device); | |
497 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
498 | schedule_work(&device->kick_work); | |
499 | } | |
500 | ||
501 | /* | |
502 | * Set the target state for a device and starts the state change. | |
503 | */ | |
8e09f215 | 504 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 LT |
505 | { |
506 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
507 | if (dasd_probeonly && target > DASD_STATE_READY) | |
508 | target = DASD_STATE_READY; | |
509 | if (device->target != target) { | |
510 | if (device->state == target) | |
511 | wake_up(&dasd_init_waitq); | |
512 | device->target = target; | |
513 | } | |
514 | if (device->state != device->target) | |
515 | dasd_change_state(device); | |
516 | } | |
517 | ||
518 | /* | |
519 | * Enable devices with device numbers in [from..to]. | |
520 | */ | |
8e09f215 | 521 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
522 | { |
523 | return (device->state == device->target); | |
524 | } | |
525 | ||
8e09f215 | 526 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
527 | { |
528 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
529 | if (device->state <= DASD_STATE_KNOWN) | |
530 | /* No discipline for device found. */ | |
531 | dasd_set_target_state(device, DASD_STATE_NEW); | |
532 | /* Now wait for the devices to come up. */ | |
533 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
534 | } | |
535 | ||
536 | /* | |
537 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
538 | */ | |
539 | #ifdef CONFIG_DASD_PROFILE | |
540 | ||
541 | struct dasd_profile_info_t dasd_global_profile; | |
542 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
543 | ||
544 | /* | |
545 | * Increments counter in global and local profiling structures. | |
546 | */ | |
8e09f215 | 547 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
548 | { \ |
549 | int index; \ | |
550 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
551 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 552 | block->profile.counter[index]++; \ |
1da177e4 LT |
553 | } |
554 | ||
555 | /* | |
556 | * Add profiling information for cqr before execution. | |
557 | */ | |
8e09f215 SW |
558 | static void dasd_profile_start(struct dasd_block *block, |
559 | struct dasd_ccw_req *cqr, | |
560 | struct request *req) | |
1da177e4 LT |
561 | { |
562 | struct list_head *l; | |
563 | unsigned int counter; | |
564 | ||
565 | if (dasd_profile_level != DASD_PROFILE_ON) | |
566 | return; | |
567 | ||
568 | /* count the length of the chanq for statistics */ | |
569 | counter = 0; | |
8e09f215 | 570 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
571 | if (++counter >= 31) |
572 | break; | |
573 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 574 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
575 | } |
576 | ||
577 | /* | |
578 | * Add profiling information for cqr after execution. | |
579 | */ | |
8e09f215 SW |
580 | static void dasd_profile_end(struct dasd_block *block, |
581 | struct dasd_ccw_req *cqr, | |
582 | struct request *req) | |
1da177e4 LT |
583 | { |
584 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
585 | long tottimeps, sectors; | |
586 | ||
587 | if (dasd_profile_level != DASD_PROFILE_ON) | |
588 | return; | |
589 | ||
590 | sectors = req->nr_sectors; | |
591 | if (!cqr->buildclk || !cqr->startclk || | |
592 | !cqr->stopclk || !cqr->endclk || | |
593 | !sectors) | |
594 | return; | |
595 | ||
596 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
597 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
598 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
599 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
600 | tottimeps = tottime / sectors; | |
601 | ||
602 | if (!dasd_global_profile.dasd_io_reqs) | |
603 | memset(&dasd_global_profile, 0, | |
8e09f215 | 604 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
605 | dasd_global_profile.dasd_io_reqs++; |
606 | dasd_global_profile.dasd_io_sects += sectors; | |
607 | ||
8e09f215 SW |
608 | if (!block->profile.dasd_io_reqs) |
609 | memset(&block->profile, 0, | |
610 | sizeof(struct dasd_profile_info_t)); | |
611 | block->profile.dasd_io_reqs++; | |
612 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 613 | |
8e09f215 SW |
614 | dasd_profile_counter(sectors, dasd_io_secs, block); |
615 | dasd_profile_counter(tottime, dasd_io_times, block); | |
616 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
617 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
618 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
619 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
620 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
621 | } |
622 | #else | |
8e09f215 SW |
623 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
624 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
625 | #endif /* CONFIG_DASD_PROFILE */ |
626 | ||
627 | /* | |
628 | * Allocate memory for a channel program with 'cplength' channel | |
629 | * command words and 'datasize' additional space. There are two | |
630 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
631 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
632 | * that gets allocated for each device. | |
633 | */ | |
8e09f215 SW |
634 | struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength, |
635 | int datasize, | |
636 | struct dasd_device *device) | |
1da177e4 LT |
637 | { |
638 | struct dasd_ccw_req *cqr; | |
639 | ||
640 | /* Sanity checks */ | |
7ac1e877 ES |
641 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
642 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 643 | |
88abaab4 | 644 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
645 | if (cqr == NULL) |
646 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
647 | cqr->cpaddr = NULL; |
648 | if (cplength > 0) { | |
88abaab4 | 649 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
650 | GFP_ATOMIC | GFP_DMA); |
651 | if (cqr->cpaddr == NULL) { | |
652 | kfree(cqr); | |
653 | return ERR_PTR(-ENOMEM); | |
654 | } | |
1da177e4 LT |
655 | } |
656 | cqr->data = NULL; | |
657 | if (datasize > 0) { | |
88abaab4 | 658 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 659 | if (cqr->data == NULL) { |
17fd682e | 660 | kfree(cqr->cpaddr); |
1da177e4 LT |
661 | kfree(cqr); |
662 | return ERR_PTR(-ENOMEM); | |
663 | } | |
1da177e4 LT |
664 | } |
665 | strncpy((char *) &cqr->magic, magic, 4); | |
666 | ASCEBC((char *) &cqr->magic, 4); | |
667 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
668 | dasd_get_device(device); | |
669 | return cqr; | |
670 | } | |
671 | ||
8e09f215 SW |
672 | struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, |
673 | int datasize, | |
674 | struct dasd_device *device) | |
1da177e4 LT |
675 | { |
676 | unsigned long flags; | |
677 | struct dasd_ccw_req *cqr; | |
678 | char *data; | |
679 | int size; | |
680 | ||
681 | /* Sanity checks */ | |
7ac1e877 ES |
682 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
683 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
684 | |
685 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
686 | if (cplength > 0) | |
687 | size += cplength * sizeof(struct ccw1); | |
688 | if (datasize > 0) | |
689 | size += datasize; | |
690 | spin_lock_irqsave(&device->mem_lock, flags); | |
691 | cqr = (struct dasd_ccw_req *) | |
692 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
693 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
694 | if (cqr == NULL) | |
695 | return ERR_PTR(-ENOMEM); | |
696 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
697 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
698 | cqr->cpaddr = NULL; | |
699 | if (cplength > 0) { | |
700 | cqr->cpaddr = (struct ccw1 *) data; | |
701 | data += cplength*sizeof(struct ccw1); | |
702 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
703 | } | |
704 | cqr->data = NULL; | |
705 | if (datasize > 0) { | |
706 | cqr->data = data; | |
707 | memset(cqr->data, 0, datasize); | |
708 | } | |
709 | strncpy((char *) &cqr->magic, magic, 4); | |
710 | ASCEBC((char *) &cqr->magic, 4); | |
711 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
712 | dasd_get_device(device); | |
713 | return cqr; | |
714 | } | |
715 | ||
716 | /* | |
717 | * Free memory of a channel program. This function needs to free all the | |
718 | * idal lists that might have been created by dasd_set_cda and the | |
719 | * struct dasd_ccw_req itself. | |
720 | */ | |
8e09f215 | 721 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 722 | { |
347a8dc3 | 723 | #ifdef CONFIG_64BIT |
1da177e4 LT |
724 | struct ccw1 *ccw; |
725 | ||
726 | /* Clear any idals used for the request. */ | |
727 | ccw = cqr->cpaddr; | |
728 | do { | |
729 | clear_normalized_cda(ccw); | |
730 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
731 | #endif | |
17fd682e JJ |
732 | kfree(cqr->cpaddr); |
733 | kfree(cqr->data); | |
1da177e4 LT |
734 | kfree(cqr); |
735 | dasd_put_device(device); | |
736 | } | |
737 | ||
8e09f215 | 738 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
739 | { |
740 | unsigned long flags; | |
741 | ||
742 | spin_lock_irqsave(&device->mem_lock, flags); | |
743 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
744 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
745 | dasd_put_device(device); | |
746 | } | |
747 | ||
748 | /* | |
749 | * Check discipline magic in cqr. | |
750 | */ | |
8e09f215 | 751 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
752 | { |
753 | struct dasd_device *device; | |
754 | ||
755 | if (cqr == NULL) | |
756 | return -EINVAL; | |
8e09f215 | 757 | device = cqr->startdev; |
1da177e4 LT |
758 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
759 | DEV_MESSAGE(KERN_WARNING, device, | |
760 | " dasd_ccw_req 0x%08x magic doesn't match" | |
761 | " discipline 0x%08x", | |
762 | cqr->magic, | |
763 | *(unsigned int *) device->discipline->name); | |
764 | return -EINVAL; | |
765 | } | |
766 | return 0; | |
767 | } | |
768 | ||
769 | /* | |
770 | * Terminate the current i/o and set the request to clear_pending. | |
771 | * Timer keeps device runnig. | |
772 | * ccw_device_clear can fail if the i/o subsystem | |
773 | * is in a bad mood. | |
774 | */ | |
8e09f215 | 775 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
776 | { |
777 | struct dasd_device *device; | |
778 | int retries, rc; | |
779 | ||
780 | /* Check the cqr */ | |
781 | rc = dasd_check_cqr(cqr); | |
782 | if (rc) | |
783 | return rc; | |
784 | retries = 0; | |
8e09f215 | 785 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
786 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
787 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
788 | switch (rc) { | |
789 | case 0: /* termination successful */ | |
c2ba444d | 790 | cqr->retries--; |
8e09f215 | 791 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 792 | cqr->stopclk = get_clock(); |
8f61701b | 793 | cqr->starttime = 0; |
1da177e4 LT |
794 | DBF_DEV_EVENT(DBF_DEBUG, device, |
795 | "terminate cqr %p successful", | |
796 | cqr); | |
797 | break; | |
798 | case -ENODEV: | |
799 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
800 | "device gone, retry"); | |
801 | break; | |
802 | case -EIO: | |
803 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
804 | "I/O error, retry"); | |
805 | break; | |
806 | case -EINVAL: | |
807 | case -EBUSY: | |
808 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
809 | "device busy, retry later"); | |
810 | break; | |
811 | default: | |
812 | DEV_MESSAGE(KERN_ERR, device, | |
813 | "line %d unknown RC=%d, please " | |
814 | "report to linux390@de.ibm.com", | |
815 | __LINE__, rc); | |
816 | BUG(); | |
817 | break; | |
818 | } | |
819 | retries++; | |
820 | } | |
8e09f215 | 821 | dasd_schedule_device_bh(device); |
1da177e4 LT |
822 | return rc; |
823 | } | |
824 | ||
825 | /* | |
826 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
827 | * In that case set up a timer to start the request later. | |
828 | */ | |
8e09f215 | 829 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
830 | { |
831 | struct dasd_device *device; | |
832 | int rc; | |
833 | ||
834 | /* Check the cqr */ | |
835 | rc = dasd_check_cqr(cqr); | |
836 | if (rc) | |
837 | return rc; | |
8e09f215 | 838 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
839 | if (cqr->retries < 0) { |
840 | DEV_MESSAGE(KERN_DEBUG, device, | |
841 | "start_IO: request %p (%02x/%i) - no retry left.", | |
842 | cqr, cqr->status, cqr->retries); | |
8e09f215 | 843 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
844 | return -EIO; |
845 | } | |
846 | cqr->startclk = get_clock(); | |
847 | cqr->starttime = jiffies; | |
848 | cqr->retries--; | |
849 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
850 | cqr->lpm, 0); | |
851 | switch (rc) { | |
852 | case 0: | |
853 | cqr->status = DASD_CQR_IN_IO; | |
854 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
855 | "start_IO: request %p started successful", | |
856 | cqr); | |
857 | break; | |
858 | case -EBUSY: | |
859 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
860 | "start_IO: device busy, retry later"); | |
861 | break; | |
862 | case -ETIMEDOUT: | |
863 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
864 | "start_IO: request timeout, retry later"); | |
865 | break; | |
866 | case -EACCES: | |
867 | /* -EACCES indicates that the request used only a | |
868 | * subset of the available pathes and all these | |
869 | * pathes are gone. | |
870 | * Do a retry with all available pathes. | |
871 | */ | |
872 | cqr->lpm = LPM_ANYPATH; | |
873 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
874 | "start_IO: selected pathes gone," | |
875 | " retry on all pathes"); | |
876 | break; | |
877 | case -ENODEV: | |
878 | case -EIO: | |
879 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
880 | "start_IO: device gone, retry"); | |
881 | break; | |
882 | default: | |
883 | DEV_MESSAGE(KERN_ERR, device, | |
884 | "line %d unknown RC=%d, please report" | |
885 | " to linux390@de.ibm.com", __LINE__, rc); | |
886 | BUG(); | |
887 | break; | |
888 | } | |
889 | return rc; | |
890 | } | |
891 | ||
892 | /* | |
893 | * Timeout function for dasd devices. This is used for different purposes | |
894 | * 1) missing interrupt handler for normal operation | |
895 | * 2) delayed start of request where start_IO failed with -EBUSY | |
896 | * 3) timeout for missing state change interrupts | |
897 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
898 | * DASD_CQR_QUEUED for 2) and 3). | |
899 | */ | |
8e09f215 | 900 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
901 | { |
902 | unsigned long flags; | |
903 | struct dasd_device *device; | |
904 | ||
905 | device = (struct dasd_device *) ptr; | |
906 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
907 | /* re-activate request queue */ | |
908 | device->stopped &= ~DASD_STOPPED_PENDING; | |
909 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
8e09f215 | 910 | dasd_schedule_device_bh(device); |
1da177e4 LT |
911 | } |
912 | ||
913 | /* | |
914 | * Setup timeout for a device in jiffies. | |
915 | */ | |
8e09f215 | 916 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 LT |
917 | { |
918 | if (expires == 0) { | |
919 | if (timer_pending(&device->timer)) | |
920 | del_timer(&device->timer); | |
921 | return; | |
922 | } | |
923 | if (timer_pending(&device->timer)) { | |
924 | if (mod_timer(&device->timer, jiffies + expires)) | |
925 | return; | |
926 | } | |
8e09f215 | 927 | device->timer.function = dasd_device_timeout; |
1da177e4 LT |
928 | device->timer.data = (unsigned long) device; |
929 | device->timer.expires = jiffies + expires; | |
930 | add_timer(&device->timer); | |
931 | } | |
932 | ||
933 | /* | |
934 | * Clear timeout for a device. | |
935 | */ | |
8e09f215 | 936 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 LT |
937 | { |
938 | if (timer_pending(&device->timer)) | |
939 | del_timer(&device->timer); | |
940 | } | |
941 | ||
8e09f215 SW |
942 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
943 | unsigned long intparm) | |
1da177e4 LT |
944 | { |
945 | struct dasd_ccw_req *cqr; | |
946 | struct dasd_device *device; | |
947 | ||
f16f5843 SW |
948 | if (!intparm) |
949 | return; | |
1da177e4 LT |
950 | cqr = (struct dasd_ccw_req *) intparm; |
951 | if (cqr->status != DASD_CQR_IN_IO) { | |
952 | MESSAGE(KERN_DEBUG, | |
953 | "invalid status in handle_killed_request: " | |
954 | "bus_id %s, status %02x", | |
2a0217d5 | 955 | dev_name(&cdev->dev), cqr->status); |
1da177e4 LT |
956 | return; |
957 | } | |
958 | ||
8e09f215 | 959 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 960 | if (device == NULL || |
a00bfd71 | 961 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 LT |
962 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
963 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
2a0217d5 | 964 | dev_name(&cdev->dev)); |
1da177e4 LT |
965 | return; |
966 | } | |
967 | ||
968 | /* Schedule request to be retried. */ | |
969 | cqr->status = DASD_CQR_QUEUED; | |
970 | ||
8e09f215 SW |
971 | dasd_device_clear_timer(device); |
972 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
973 | dasd_put_device(device); |
974 | } | |
975 | ||
8e09f215 | 976 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 977 | { |
20c64468 SW |
978 | /* First of all start sense subsystem status request. */ |
979 | dasd_eer_snss(device); | |
980 | ||
1da177e4 | 981 | device->stopped &= ~DASD_STOPPED_PENDING; |
8e09f215 SW |
982 | dasd_schedule_device_bh(device); |
983 | if (device->block) | |
984 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
985 | } |
986 | ||
987 | /* | |
988 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
989 | */ | |
8e09f215 SW |
990 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
991 | struct irb *irb) | |
1da177e4 LT |
992 | { |
993 | struct dasd_ccw_req *cqr, *next; | |
994 | struct dasd_device *device; | |
995 | unsigned long long now; | |
996 | int expires; | |
1da177e4 LT |
997 | |
998 | if (IS_ERR(irb)) { | |
999 | switch (PTR_ERR(irb)) { | |
1000 | case -EIO: | |
1da177e4 LT |
1001 | break; |
1002 | case -ETIMEDOUT: | |
1003 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
2a0217d5 | 1004 | __func__, dev_name(&cdev->dev)); |
1da177e4 LT |
1005 | break; |
1006 | default: | |
1007 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
2a0217d5 | 1008 | __func__, dev_name(&cdev->dev), PTR_ERR(irb)); |
1da177e4 | 1009 | } |
f16f5843 | 1010 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1011 | return; |
1012 | } | |
1013 | ||
1014 | now = get_clock(); | |
1015 | ||
1016 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
2a0217d5 | 1017 | dev_name(&cdev->dev), ((irb->scsw.cmd.cstat << 8) | |
23d805b6 | 1018 | irb->scsw.cmd.dstat), (unsigned int) intparm); |
1da177e4 | 1019 | |
8e09f215 SW |
1020 | /* check for unsolicited interrupts */ |
1021 | cqr = (struct dasd_ccw_req *) intparm; | |
23d805b6 PO |
1022 | if (!cqr || ((irb->scsw.cmd.cc == 1) && |
1023 | (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) && | |
1024 | (irb->scsw.cmd.stctl & SCSW_STCTL_STATUS_PEND))) { | |
8e09f215 SW |
1025 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
1026 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1027 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1028 | if (!IS_ERR(device)) { |
8e09f215 SW |
1029 | dasd_device_clear_timer(device); |
1030 | device->discipline->handle_unsolicited_interrupt(device, | |
1031 | irb); | |
1da177e4 LT |
1032 | dasd_put_device(device); |
1033 | } | |
1034 | return; | |
1035 | } | |
1036 | ||
8e09f215 SW |
1037 | device = (struct dasd_device *) cqr->startdev; |
1038 | if (!device || | |
1da177e4 LT |
1039 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
1040 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
2a0217d5 | 1041 | dev_name(&cdev->dev)); |
1da177e4 LT |
1042 | return; |
1043 | } | |
1044 | ||
1045 | /* Check for clear pending */ | |
8e09f215 | 1046 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
23d805b6 | 1047 | irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1048 | cqr->status = DASD_CQR_CLEARED; |
1049 | dasd_device_clear_timer(device); | |
8f61701b | 1050 | wake_up(&dasd_flush_wq); |
8e09f215 | 1051 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1052 | return; |
1053 | } | |
1054 | ||
1055 | /* check status - the request might have been killed by dyn detach */ | |
1056 | if (cqr->status != DASD_CQR_IN_IO) { | |
1057 | MESSAGE(KERN_DEBUG, | |
1058 | "invalid status: bus_id %s, status %02x", | |
2a0217d5 | 1059 | dev_name(&cdev->dev), cqr->status); |
1da177e4 LT |
1060 | return; |
1061 | } | |
1062 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
23d805b6 | 1063 | ((irb->scsw.cmd.cstat << 8) | irb->scsw.cmd.dstat), cqr); |
8e09f215 | 1064 | next = NULL; |
1da177e4 | 1065 | expires = 0; |
23d805b6 PO |
1066 | if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1067 | irb->scsw.cmd.cstat == 0 && !irb->esw.esw0.erw.cons) { | |
8e09f215 SW |
1068 | /* request was completed successfully */ |
1069 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1070 | cqr->stopclk = now; |
1071 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1072 | if (cqr->devlist.next != &device->ccw_queue) { |
1073 | next = list_entry(cqr->devlist.next, | |
1074 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1075 | } |
8e09f215 SW |
1076 | } else { /* error */ |
1077 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
9575bf26 | 1078 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1079 | dasd_log_sense(cqr, irb); |
1080 | } | |
6c5f57c7 SH |
1081 | /* |
1082 | * If we don't want complex ERP for this request, then just | |
1083 | * reset this and retry it in the fastpath | |
8e09f215 | 1084 | */ |
6c5f57c7 | 1085 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 SW |
1086 | cqr->retries > 0) { |
1087 | DEV_MESSAGE(KERN_DEBUG, device, | |
1088 | "default ERP in fastpath (%i retries left)", | |
1089 | cqr->retries); | |
1090 | cqr->lpm = LPM_ANYPATH; | |
1091 | cqr->status = DASD_CQR_QUEUED; | |
1092 | next = cqr; | |
1093 | } else | |
1da177e4 | 1094 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1095 | } |
1096 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1097 | (!device->stopped)) { | |
1098 | if (device->discipline->start_IO(next) == 0) | |
1099 | expires = next->expires; | |
1100 | else | |
1101 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1102 | "Interrupt fastpath " | |
1103 | "failed!"); | |
1da177e4 LT |
1104 | } |
1105 | if (expires != 0) | |
8e09f215 | 1106 | dasd_device_set_timer(device, expires); |
1da177e4 | 1107 | else |
8e09f215 SW |
1108 | dasd_device_clear_timer(device); |
1109 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1110 | } |
1111 | ||
1112 | /* | |
8e09f215 SW |
1113 | * If we have an error on a dasd_block layer request then we cancel |
1114 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1115 | */ |
8e09f215 SW |
1116 | static void __dasd_device_recovery(struct dasd_device *device, |
1117 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1118 | { |
8e09f215 SW |
1119 | struct list_head *l, *n; |
1120 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1121 | |
8e09f215 SW |
1122 | /* |
1123 | * only requeue request that came from the dasd_block layer | |
1124 | */ | |
1125 | if (!ref_cqr->block) | |
1126 | return; | |
1da177e4 | 1127 | |
8e09f215 SW |
1128 | list_for_each_safe(l, n, &device->ccw_queue) { |
1129 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1130 | if (cqr->status == DASD_CQR_QUEUED && | |
1131 | ref_cqr->block == cqr->block) { | |
1132 | cqr->status = DASD_CQR_CLEARED; | |
1133 | } | |
1134 | } | |
1135 | }; | |
1da177e4 LT |
1136 | |
1137 | /* | |
8e09f215 SW |
1138 | * Remove those ccw requests from the queue that need to be returned |
1139 | * to the upper layer. | |
1da177e4 | 1140 | */ |
8e09f215 SW |
1141 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1142 | struct list_head *final_queue) | |
1da177e4 LT |
1143 | { |
1144 | struct list_head *l, *n; | |
1145 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1146 | |
1da177e4 LT |
1147 | /* Process request with final status. */ |
1148 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1149 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1150 | ||
1da177e4 | 1151 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1152 | if (cqr->status == DASD_CQR_QUEUED || |
1153 | cqr->status == DASD_CQR_IN_IO || | |
1154 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1155 | break; |
1da177e4 | 1156 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1157 | __dasd_device_recovery(device, cqr); |
20c64468 | 1158 | } |
1da177e4 | 1159 | /* Rechain finished requests to final queue */ |
8e09f215 | 1160 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1161 | } |
1162 | } | |
1163 | ||
1da177e4 | 1164 | /* |
8e09f215 SW |
1165 | * the cqrs from the final queue are returned to the upper layer |
1166 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1167 | */ |
8e09f215 SW |
1168 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1169 | struct list_head *final_queue) | |
1da177e4 | 1170 | { |
8e09f215 | 1171 | struct list_head *l, *n; |
1da177e4 | 1172 | struct dasd_ccw_req *cqr; |
03513bcc | 1173 | struct dasd_block *block; |
c80ee724 SH |
1174 | void (*callback)(struct dasd_ccw_req *, void *data); |
1175 | void *callback_data; | |
f24acd45 | 1176 | |
8e09f215 SW |
1177 | list_for_each_safe(l, n, final_queue) { |
1178 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1179 | list_del_init(&cqr->devlist); | |
03513bcc | 1180 | block = cqr->block; |
c80ee724 SH |
1181 | callback = cqr->callback; |
1182 | callback_data = cqr->callback_data; | |
03513bcc SW |
1183 | if (block) |
1184 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1185 | switch (cqr->status) { |
1186 | case DASD_CQR_SUCCESS: | |
1187 | cqr->status = DASD_CQR_DONE; | |
1188 | break; | |
1189 | case DASD_CQR_ERROR: | |
1190 | cqr->status = DASD_CQR_NEED_ERP; | |
1191 | break; | |
1192 | case DASD_CQR_CLEARED: | |
1193 | cqr->status = DASD_CQR_TERMINATED; | |
1194 | break; | |
1195 | default: | |
1196 | DEV_MESSAGE(KERN_ERR, device, | |
1197 | "wrong cqr status in __dasd_process_final_queue " | |
1198 | "for cqr %p, status %x", | |
1199 | cqr, cqr->status); | |
1200 | BUG(); | |
1da177e4 | 1201 | } |
8e09f215 | 1202 | if (cqr->callback != NULL) |
c80ee724 | 1203 | (callback)(cqr, callback_data); |
03513bcc SW |
1204 | if (block) |
1205 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1206 | } |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * Take a look at the first request on the ccw queue and check | |
1211 | * if it reached its expire time. If so, terminate the IO. | |
1212 | */ | |
8e09f215 | 1213 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1214 | { |
1215 | struct dasd_ccw_req *cqr; | |
1216 | ||
1217 | if (list_empty(&device->ccw_queue)) | |
1218 | return; | |
8e09f215 | 1219 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1220 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1221 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1222 | if (device->discipline->term_IO(cqr) != 0) { | |
1223 | /* Hmpf, try again in 5 sec */ | |
29145a6c HH |
1224 | DEV_MESSAGE(KERN_ERR, device, |
1225 | "internal error - timeout (%is) expired " | |
1226 | "for cqr %p, termination failed, " | |
1227 | "retrying in 5s", | |
1228 | (cqr->expires/HZ), cqr); | |
7dc1da9f SH |
1229 | cqr->expires += 5*HZ; |
1230 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1231 | } else { |
8f61701b HH |
1232 | DEV_MESSAGE(KERN_ERR, device, |
1233 | "internal error - timeout (%is) expired " | |
1234 | "for cqr %p (%i retries left)", | |
1235 | (cqr->expires/HZ), cqr, cqr->retries); | |
1da177e4 LT |
1236 | } |
1237 | } | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * Take a look at the first request on the ccw queue and check | |
1242 | * if it needs to be started. | |
1243 | */ | |
8e09f215 | 1244 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1245 | { |
1246 | struct dasd_ccw_req *cqr; | |
1247 | int rc; | |
1248 | ||
1249 | if (list_empty(&device->ccw_queue)) | |
1250 | return; | |
8e09f215 | 1251 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1252 | if (cqr->status != DASD_CQR_QUEUED) |
1253 | return; | |
8e09f215 SW |
1254 | /* when device is stopped, return request to previous layer */ |
1255 | if (device->stopped) { | |
1256 | cqr->status = DASD_CQR_CLEARED; | |
1257 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1258 | return; |
1c01b8a5 | 1259 | } |
25ee4cf8 PO |
1260 | |
1261 | rc = device->discipline->start_IO(cqr); | |
1262 | if (rc == 0) | |
8e09f215 | 1263 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1264 | else if (rc == -EACCES) { |
8e09f215 | 1265 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1266 | } else |
1267 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1268 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1269 | } |
1270 | ||
1da177e4 | 1271 | /* |
8e09f215 SW |
1272 | * Go through all request on the dasd_device request queue, |
1273 | * terminate them on the cdev if necessary, and return them to the | |
1274 | * submitting layer via callback. | |
1275 | * Note: | |
1276 | * Make sure that all 'submitting layers' still exist when | |
1277 | * this function is called!. In other words, when 'device' is a base | |
1278 | * device then all block layer requests must have been removed before | |
1279 | * via dasd_flush_block_queue. | |
1da177e4 | 1280 | */ |
8e09f215 | 1281 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1282 | { |
8e09f215 SW |
1283 | struct dasd_ccw_req *cqr, *n; |
1284 | int rc; | |
1da177e4 | 1285 | struct list_head flush_queue; |
1da177e4 LT |
1286 | |
1287 | INIT_LIST_HEAD(&flush_queue); | |
1288 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1289 | rc = 0; |
8e09f215 | 1290 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1291 | /* Check status and move request to flush_queue */ |
1292 | switch (cqr->status) { | |
1293 | case DASD_CQR_IN_IO: | |
1294 | rc = device->discipline->term_IO(cqr); | |
1295 | if (rc) { | |
1296 | /* unable to terminate requeust */ | |
1297 | DEV_MESSAGE(KERN_ERR, device, | |
1298 | "dasd flush ccw_queue is unable " | |
1299 | " to terminate request %p", | |
1300 | cqr); | |
1301 | /* stop flush processing */ | |
1302 | goto finished; | |
1303 | } | |
1304 | break; | |
1305 | case DASD_CQR_QUEUED: | |
1da177e4 | 1306 | cqr->stopclk = get_clock(); |
8e09f215 | 1307 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1308 | break; |
8e09f215 | 1309 | default: /* no need to modify the others */ |
8f61701b HH |
1310 | break; |
1311 | } | |
8e09f215 | 1312 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1313 | } |
8f61701b HH |
1314 | finished: |
1315 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1316 | /* |
1317 | * After this point all requests must be in state CLEAR_PENDING, | |
1318 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1319 | * one of the others. | |
1320 | */ | |
1321 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1322 | wait_event(dasd_flush_wq, | |
1323 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1324 | /* | |
1325 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1326 | * and call the callback function of flushed requests | |
1327 | */ | |
1328 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1329 | return rc; |
1da177e4 LT |
1330 | } |
1331 | ||
1332 | /* | |
1333 | * Acquire the device lock and process queues for the device. | |
1334 | */ | |
8e09f215 | 1335 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1336 | { |
1337 | struct list_head final_queue; | |
1da177e4 LT |
1338 | |
1339 | atomic_set (&device->tasklet_scheduled, 0); | |
1340 | INIT_LIST_HEAD(&final_queue); | |
1341 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1342 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1343 | __dasd_device_check_expire(device); |
1344 | /* find final requests on ccw queue */ | |
1345 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1346 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1347 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1348 | __dasd_device_process_final_queue(device, &final_queue); |
1349 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1350 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1351 | __dasd_device_start_head(device); |
1352 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1353 | dasd_put_device(device); |
1354 | } | |
1355 | ||
1356 | /* | |
1357 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1358 | */ | |
8e09f215 | 1359 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1360 | { |
1361 | /* Protect against rescheduling. */ | |
973bd993 | 1362 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1363 | return; |
1364 | dasd_get_device(device); | |
1365 | tasklet_hi_schedule(&device->tasklet); | |
1366 | } | |
1367 | ||
1368 | /* | |
8e09f215 SW |
1369 | * Queue a request to the head of the device ccw_queue. |
1370 | * Start the I/O if possible. | |
1da177e4 | 1371 | */ |
8e09f215 | 1372 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1373 | { |
1374 | struct dasd_device *device; | |
1375 | unsigned long flags; | |
1376 | ||
8e09f215 | 1377 | device = cqr->startdev; |
1da177e4 | 1378 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1379 | cqr->status = DASD_CQR_QUEUED; |
1380 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1381 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1382 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1383 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1384 | } | |
1385 | ||
1386 | /* | |
8e09f215 SW |
1387 | * Queue a request to the tail of the device ccw_queue. |
1388 | * Start the I/O if possible. | |
1da177e4 | 1389 | */ |
8e09f215 | 1390 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1391 | { |
1392 | struct dasd_device *device; | |
1393 | unsigned long flags; | |
1394 | ||
8e09f215 | 1395 | device = cqr->startdev; |
1da177e4 | 1396 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1397 | cqr->status = DASD_CQR_QUEUED; |
1398 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1399 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1400 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1401 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1402 | } | |
1403 | ||
1404 | /* | |
8e09f215 | 1405 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1406 | */ |
8e09f215 | 1407 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 LT |
1408 | { |
1409 | wake_up((wait_queue_head_t *) data); | |
1410 | } | |
1411 | ||
8e09f215 | 1412 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1413 | { |
1414 | struct dasd_device *device; | |
1415 | int rc; | |
1416 | ||
8e09f215 | 1417 | device = cqr->startdev; |
1da177e4 | 1418 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
c2ba444d | 1419 | rc = ((cqr->status == DASD_CQR_DONE || |
8e09f215 SW |
1420 | cqr->status == DASD_CQR_NEED_ERP || |
1421 | cqr->status == DASD_CQR_TERMINATED) && | |
1422 | list_empty(&cqr->devlist)); | |
1da177e4 LT |
1423 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1424 | return rc; | |
1425 | } | |
1426 | ||
1427 | /* | |
8e09f215 SW |
1428 | * Queue a request to the tail of the device ccw_queue and wait for |
1429 | * it's completion. | |
1da177e4 | 1430 | */ |
8e09f215 | 1431 | int dasd_sleep_on(struct dasd_ccw_req *cqr) |
1da177e4 | 1432 | { |
1da177e4 LT |
1433 | struct dasd_device *device; |
1434 | int rc; | |
138c014d | 1435 | |
8e09f215 | 1436 | device = cqr->startdev; |
138c014d | 1437 | |
1da177e4 | 1438 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1439 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1440 | dasd_add_request_tail(cqr); |
c80ee724 | 1441 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1442 | |
1da177e4 | 1443 | /* Request status is either done or failed. */ |
8e09f215 | 1444 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1445 | return rc; |
1446 | } | |
1447 | ||
1448 | /* | |
8e09f215 SW |
1449 | * Queue a request to the tail of the device ccw_queue and wait |
1450 | * interruptible for it's completion. | |
1da177e4 | 1451 | */ |
8e09f215 | 1452 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1453 | { |
1da177e4 | 1454 | struct dasd_device *device; |
8e09f215 | 1455 | int rc; |
1da177e4 | 1456 | |
8e09f215 | 1457 | device = cqr->startdev; |
1da177e4 | 1458 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1459 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1460 | dasd_add_request_tail(cqr); |
c80ee724 | 1461 | rc = wait_event_interruptible(generic_waitq, _wait_for_wakeup(cqr)); |
8e09f215 SW |
1462 | if (rc == -ERESTARTSYS) { |
1463 | dasd_cancel_req(cqr); | |
1464 | /* wait (non-interruptible) for final status */ | |
c80ee724 | 1465 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
1da177e4 | 1466 | } |
8e09f215 | 1467 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1468 | return rc; |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1473 | * for eckd devices) the currently running request has to be terminated | |
1474 | * and be put back to status queued, before the special request is added | |
1475 | * to the head of the queue. Then the special request is waited on normally. | |
1476 | */ | |
8e09f215 | 1477 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1478 | { |
1479 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1480 | |
1481 | if (list_empty(&device->ccw_queue)) | |
1482 | return 0; | |
8e09f215 | 1483 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1484 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1485 | } |
1486 | ||
8e09f215 | 1487 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1488 | { |
1da177e4 LT |
1489 | struct dasd_device *device; |
1490 | int rc; | |
138c014d | 1491 | |
8e09f215 | 1492 | device = cqr->startdev; |
1da177e4 LT |
1493 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1494 | rc = _dasd_term_running_cqr(device); | |
1495 | if (rc) { | |
1496 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1497 | return rc; | |
1498 | } | |
138c014d | 1499 | |
1da177e4 | 1500 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1501 | cqr->callback_data = (void *) &generic_waitq; |
1da177e4 | 1502 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1503 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1504 | |
1da177e4 | 1505 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1506 | dasd_schedule_device_bh(device); |
138c014d | 1507 | |
1da177e4 LT |
1508 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1509 | ||
c80ee724 | 1510 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1511 | |
1da177e4 | 1512 | /* Request status is either done or failed. */ |
8e09f215 | 1513 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1514 | return rc; |
1515 | } | |
1516 | ||
1517 | /* | |
1518 | * Cancels a request that was started with dasd_sleep_on_req. | |
1519 | * This is useful to timeout requests. The request will be | |
1520 | * terminated if it is currently in i/o. | |
1521 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1522 | * 0 if there was no need to terminate the request (not started yet) |
1523 | * negative error code if termination failed | |
1524 | * Cancellation of a request is an asynchronous operation! The calling | |
1525 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1526 | */ |
8e09f215 | 1527 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1528 | { |
8e09f215 | 1529 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1530 | unsigned long flags; |
1531 | int rc; | |
1532 | ||
1533 | rc = 0; | |
1534 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1535 | switch (cqr->status) { | |
1536 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1537 | /* request was not started - just set to cleared */ |
1538 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1539 | break; |
1540 | case DASD_CQR_IN_IO: | |
1541 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1542 | rc = device->discipline->term_IO(cqr); |
1543 | if (rc) { | |
1544 | DEV_MESSAGE(KERN_ERR, device, | |
1545 | "dasd_cancel_req is unable " | |
1546 | " to terminate request %p, rc = %d", | |
1547 | cqr, rc); | |
1548 | } else { | |
1549 | cqr->stopclk = get_clock(); | |
1550 | rc = 1; | |
1551 | } | |
1da177e4 | 1552 | break; |
8e09f215 | 1553 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1554 | break; |
8e09f215 SW |
1555 | } |
1556 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1557 | dasd_schedule_device_bh(device); | |
1558 | return rc; | |
1559 | } | |
1560 | ||
1561 | ||
1562 | /* | |
1563 | * SECTION: Operations of the dasd_block layer. | |
1564 | */ | |
1565 | ||
1566 | /* | |
1567 | * Timeout function for dasd_block. This is used when the block layer | |
1568 | * is waiting for something that may not come reliably, (e.g. a state | |
1569 | * change interrupt) | |
1570 | */ | |
1571 | static void dasd_block_timeout(unsigned long ptr) | |
1572 | { | |
1573 | unsigned long flags; | |
1574 | struct dasd_block *block; | |
1575 | ||
1576 | block = (struct dasd_block *) ptr; | |
1577 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1578 | /* re-activate request queue */ | |
1579 | block->base->stopped &= ~DASD_STOPPED_PENDING; | |
1580 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); | |
1581 | dasd_schedule_block_bh(block); | |
1582 | } | |
1583 | ||
1584 | /* | |
1585 | * Setup timeout for a dasd_block in jiffies. | |
1586 | */ | |
1587 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1588 | { | |
1589 | if (expires == 0) { | |
1590 | if (timer_pending(&block->timer)) | |
1591 | del_timer(&block->timer); | |
1592 | return; | |
1593 | } | |
1594 | if (timer_pending(&block->timer)) { | |
1595 | if (mod_timer(&block->timer, jiffies + expires)) | |
1596 | return; | |
1597 | } | |
1598 | block->timer.function = dasd_block_timeout; | |
1599 | block->timer.data = (unsigned long) block; | |
1600 | block->timer.expires = jiffies + expires; | |
1601 | add_timer(&block->timer); | |
1602 | } | |
1603 | ||
1604 | /* | |
1605 | * Clear timeout for a dasd_block. | |
1606 | */ | |
1607 | void dasd_block_clear_timer(struct dasd_block *block) | |
1608 | { | |
1609 | if (timer_pending(&block->timer)) | |
1610 | del_timer(&block->timer); | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * posts the buffer_cache about a finalized request | |
1615 | */ | |
4c4e2148 | 1616 | static inline void dasd_end_request(struct request *req, int error) |
8e09f215 | 1617 | { |
4c4e2148 | 1618 | if (__blk_end_request(req, error, blk_rq_bytes(req))) |
1da177e4 | 1619 | BUG(); |
8e09f215 SW |
1620 | } |
1621 | ||
1622 | /* | |
1623 | * Process finished error recovery ccw. | |
1624 | */ | |
1625 | static inline void __dasd_block_process_erp(struct dasd_block *block, | |
1626 | struct dasd_ccw_req *cqr) | |
1627 | { | |
1628 | dasd_erp_fn_t erp_fn; | |
1629 | struct dasd_device *device = block->base; | |
1630 | ||
1631 | if (cqr->status == DASD_CQR_DONE) | |
1632 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1633 | else | |
1634 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1635 | erp_fn = device->discipline->erp_postaction(cqr); | |
1636 | erp_fn(cqr); | |
1637 | } | |
1da177e4 | 1638 | |
8e09f215 SW |
1639 | /* |
1640 | * Fetch requests from the block device queue. | |
1641 | */ | |
1642 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1643 | { | |
1644 | struct request_queue *queue; | |
1645 | struct request *req; | |
1646 | struct dasd_ccw_req *cqr; | |
1647 | struct dasd_device *basedev; | |
1648 | unsigned long flags; | |
1649 | queue = block->request_queue; | |
1650 | basedev = block->base; | |
1651 | /* No queue ? Then there is nothing to do. */ | |
1652 | if (queue == NULL) | |
1653 | return; | |
1654 | ||
1655 | /* | |
1656 | * We requeue request from the block device queue to the ccw | |
1657 | * queue only in two states. In state DASD_STATE_READY the | |
1658 | * partition detection is done and we need to requeue requests | |
1659 | * for that. State DASD_STATE_ONLINE is normal block device | |
1660 | * operation. | |
1661 | */ | |
1662 | if (basedev->state < DASD_STATE_READY) | |
1663 | return; | |
1664 | /* Now we try to fetch requests from the request queue */ | |
1665 | while (!blk_queue_plugged(queue) && | |
1666 | elv_next_request(queue)) { | |
1667 | ||
1668 | req = elv_next_request(queue); | |
1669 | ||
1670 | if (basedev->features & DASD_FEATURE_READONLY && | |
1671 | rq_data_dir(req) == WRITE) { | |
1672 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1673 | "Rejecting write request %p", | |
1674 | req); | |
1675 | blkdev_dequeue_request(req); | |
4c4e2148 | 1676 | dasd_end_request(req, -EIO); |
8e09f215 SW |
1677 | continue; |
1678 | } | |
1679 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1680 | if (IS_ERR(cqr)) { | |
1681 | if (PTR_ERR(cqr) == -EBUSY) | |
1682 | break; /* normal end condition */ | |
1683 | if (PTR_ERR(cqr) == -ENOMEM) | |
1684 | break; /* terminate request queue loop */ | |
1685 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1686 | /* | |
1687 | * The current request cannot be build right | |
1688 | * now, we have to try later. If this request | |
1689 | * is the head-of-queue we stop the device | |
1690 | * for 1/2 second. | |
1691 | */ | |
1692 | if (!list_empty(&block->ccw_queue)) | |
1693 | break; | |
1694 | spin_lock_irqsave(get_ccwdev_lock(basedev->cdev), flags); | |
1695 | basedev->stopped |= DASD_STOPPED_PENDING; | |
1696 | spin_unlock_irqrestore(get_ccwdev_lock(basedev->cdev), flags); | |
1697 | dasd_block_set_timer(block, HZ/2); | |
1698 | break; | |
1699 | } | |
1700 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1701 | "CCW creation failed (rc=%ld) " | |
1702 | "on request %p", | |
1703 | PTR_ERR(cqr), req); | |
1704 | blkdev_dequeue_request(req); | |
4c4e2148 | 1705 | dasd_end_request(req, -EIO); |
8e09f215 SW |
1706 | continue; |
1707 | } | |
1708 | /* | |
1709 | * Note: callback is set to dasd_return_cqr_cb in | |
1710 | * __dasd_block_start_head to cover erp requests as well | |
1711 | */ | |
1712 | cqr->callback_data = (void *) req; | |
1713 | cqr->status = DASD_CQR_FILLED; | |
1714 | blkdev_dequeue_request(req); | |
1715 | list_add_tail(&cqr->blocklist, &block->ccw_queue); | |
1716 | dasd_profile_start(block, cqr, req); | |
1717 | } | |
1718 | } | |
1719 | ||
1720 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1721 | { | |
1722 | struct request *req; | |
1723 | int status; | |
4c4e2148 | 1724 | int error = 0; |
8e09f215 SW |
1725 | |
1726 | req = (struct request *) cqr->callback_data; | |
1727 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1728 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1729 | if (status <= 0) |
1730 | error = status ? status : -EIO; | |
1731 | dasd_end_request(req, error); | |
8e09f215 SW |
1732 | } |
1733 | ||
1734 | /* | |
1735 | * Process ccw request queue. | |
1736 | */ | |
1737 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1738 | struct list_head *final_queue) | |
1739 | { | |
1740 | struct list_head *l, *n; | |
1741 | struct dasd_ccw_req *cqr; | |
1742 | dasd_erp_fn_t erp_fn; | |
1743 | unsigned long flags; | |
1744 | struct dasd_device *base = block->base; | |
1745 | ||
1746 | restart: | |
1747 | /* Process request with final status. */ | |
1748 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1749 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1750 | if (cqr->status != DASD_CQR_DONE && | |
1751 | cqr->status != DASD_CQR_FAILED && | |
1752 | cqr->status != DASD_CQR_NEED_ERP && | |
1753 | cqr->status != DASD_CQR_TERMINATED) | |
1754 | continue; | |
1755 | ||
1756 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1757 | base->discipline->handle_terminated_request(cqr); | |
1758 | goto restart; | |
1759 | } | |
1760 | ||
1761 | /* Process requests that may be recovered */ | |
1762 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 SH |
1763 | erp_fn = base->discipline->erp_action(cqr); |
1764 | erp_fn(cqr); | |
8e09f215 SW |
1765 | goto restart; |
1766 | } | |
1767 | ||
a9cffb22 SH |
1768 | /* log sense for fatal error */ |
1769 | if (cqr->status == DASD_CQR_FAILED) { | |
1770 | dasd_log_sense(cqr, &cqr->irb); | |
1771 | } | |
1772 | ||
8e09f215 SW |
1773 | /* First of all call extended error reporting. */ |
1774 | if (dasd_eer_enabled(base) && | |
1775 | cqr->status == DASD_CQR_FAILED) { | |
1776 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1777 | ||
1778 | /* restart request */ | |
1779 | cqr->status = DASD_CQR_FILLED; | |
1780 | cqr->retries = 255; | |
1781 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
1782 | base->stopped |= DASD_STOPPED_QUIESCE; | |
1783 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), | |
1784 | flags); | |
1785 | goto restart; | |
1786 | } | |
1787 | ||
1788 | /* Process finished ERP request. */ | |
1789 | if (cqr->refers) { | |
1790 | __dasd_block_process_erp(block, cqr); | |
1791 | goto restart; | |
1792 | } | |
1793 | ||
1794 | /* Rechain finished requests to final queue */ | |
1795 | cqr->endclk = get_clock(); | |
1796 | list_move_tail(&cqr->blocklist, final_queue); | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1801 | { | |
1802 | dasd_schedule_block_bh(cqr->block); | |
1803 | } | |
1804 | ||
1805 | static void __dasd_block_start_head(struct dasd_block *block) | |
1806 | { | |
1807 | struct dasd_ccw_req *cqr; | |
1808 | ||
1809 | if (list_empty(&block->ccw_queue)) | |
1810 | return; | |
1811 | /* We allways begin with the first requests on the queue, as some | |
1812 | * of previously started requests have to be enqueued on a | |
1813 | * dasd_device again for error recovery. | |
1814 | */ | |
1815 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1816 | if (cqr->status != DASD_CQR_FILLED) | |
1817 | continue; | |
1818 | /* Non-temporary stop condition will trigger fail fast */ | |
1819 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1820 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1821 | (!dasd_eer_enabled(block->base))) { | |
1822 | cqr->status = DASD_CQR_FAILED; | |
1823 | dasd_schedule_block_bh(block); | |
1824 | continue; | |
1825 | } | |
1826 | /* Don't try to start requests if device is stopped */ | |
1827 | if (block->base->stopped) | |
1828 | return; | |
1829 | ||
1830 | /* just a fail safe check, should not happen */ | |
1831 | if (!cqr->startdev) | |
1832 | cqr->startdev = block->base; | |
1833 | ||
1834 | /* make sure that the requests we submit find their way back */ | |
1835 | cqr->callback = dasd_return_cqr_cb; | |
1836 | ||
1837 | dasd_add_request_tail(cqr); | |
1838 | } | |
1839 | } | |
1840 | ||
1841 | /* | |
1842 | * Central dasd_block layer routine. Takes requests from the generic | |
1843 | * block layer request queue, creates ccw requests, enqueues them on | |
1844 | * a dasd_device and processes ccw requests that have been returned. | |
1845 | */ | |
1846 | static void dasd_block_tasklet(struct dasd_block *block) | |
1847 | { | |
1848 | struct list_head final_queue; | |
1849 | struct list_head *l, *n; | |
1850 | struct dasd_ccw_req *cqr; | |
1851 | ||
1852 | atomic_set(&block->tasklet_scheduled, 0); | |
1853 | INIT_LIST_HEAD(&final_queue); | |
1854 | spin_lock(&block->queue_lock); | |
1855 | /* Finish off requests on ccw queue */ | |
1856 | __dasd_process_block_ccw_queue(block, &final_queue); | |
1857 | spin_unlock(&block->queue_lock); | |
1858 | /* Now call the callback function of requests with final status */ | |
1859 | spin_lock_irq(&block->request_queue_lock); | |
1860 | list_for_each_safe(l, n, &final_queue) { | |
1861 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1862 | list_del_init(&cqr->blocklist); | |
1863 | __dasd_cleanup_cqr(cqr); | |
1864 | } | |
1865 | spin_lock(&block->queue_lock); | |
1866 | /* Get new request from the block device request queue */ | |
1867 | __dasd_process_request_queue(block); | |
1868 | /* Now check if the head of the ccw queue needs to be started. */ | |
1869 | __dasd_block_start_head(block); | |
1870 | spin_unlock(&block->queue_lock); | |
1871 | spin_unlock_irq(&block->request_queue_lock); | |
1872 | dasd_put_device(block->base); | |
1873 | } | |
1874 | ||
1875 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
1876 | { | |
1877 | wake_up(&dasd_flush_wq); | |
1878 | } | |
1879 | ||
1880 | /* | |
1881 | * Go through all request on the dasd_block request queue, cancel them | |
1882 | * on the respective dasd_device, and return them to the generic | |
1883 | * block layer. | |
1884 | */ | |
1885 | static int dasd_flush_block_queue(struct dasd_block *block) | |
1886 | { | |
1887 | struct dasd_ccw_req *cqr, *n; | |
1888 | int rc, i; | |
1889 | struct list_head flush_queue; | |
1890 | ||
1891 | INIT_LIST_HEAD(&flush_queue); | |
1892 | spin_lock_bh(&block->queue_lock); | |
1893 | rc = 0; | |
1894 | restart: | |
1895 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
1896 | /* if this request currently owned by a dasd_device cancel it */ | |
1897 | if (cqr->status >= DASD_CQR_QUEUED) | |
1898 | rc = dasd_cancel_req(cqr); | |
1899 | if (rc < 0) | |
1900 | break; | |
1901 | /* Rechain request (including erp chain) so it won't be | |
1902 | * touched by the dasd_block_tasklet anymore. | |
1903 | * Replace the callback so we notice when the request | |
1904 | * is returned from the dasd_device layer. | |
1905 | */ | |
1906 | cqr->callback = _dasd_wake_block_flush_cb; | |
1907 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
1908 | list_move_tail(&cqr->blocklist, &flush_queue); | |
1909 | if (i > 1) | |
1910 | /* moved more than one request - need to restart */ | |
1911 | goto restart; | |
1912 | } | |
1913 | spin_unlock_bh(&block->queue_lock); | |
1914 | /* Now call the callback function of flushed requests */ | |
1915 | restart_cb: | |
1916 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
1917 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
1918 | /* Process finished ERP request. */ | |
1919 | if (cqr->refers) { | |
0cd4bd47 | 1920 | spin_lock_bh(&block->queue_lock); |
8e09f215 | 1921 | __dasd_block_process_erp(block, cqr); |
0cd4bd47 | 1922 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
1923 | /* restart list_for_xx loop since dasd_process_erp |
1924 | * might remove multiple elements */ | |
1925 | goto restart_cb; | |
1926 | } | |
1927 | /* call the callback function */ | |
0cd4bd47 | 1928 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
1929 | cqr->endclk = get_clock(); |
1930 | list_del_init(&cqr->blocklist); | |
1931 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 1932 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 1933 | } |
1da177e4 LT |
1934 | return rc; |
1935 | } | |
1936 | ||
1937 | /* | |
8e09f215 SW |
1938 | * Schedules a call to dasd_tasklet over the device tasklet. |
1939 | */ | |
1940 | void dasd_schedule_block_bh(struct dasd_block *block) | |
1941 | { | |
1942 | /* Protect against rescheduling. */ | |
1943 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
1944 | return; | |
1945 | /* life cycle of block is bound to it's base device */ | |
1946 | dasd_get_device(block->base); | |
1947 | tasklet_hi_schedule(&block->tasklet); | |
1948 | } | |
1949 | ||
1950 | ||
1951 | /* | |
1952 | * SECTION: external block device operations | |
1953 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
1954 | */ |
1955 | ||
1956 | /* | |
1957 | * Dasd request queue function. Called from ll_rw_blk.c | |
1958 | */ | |
8e09f215 | 1959 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 1960 | { |
8e09f215 | 1961 | struct dasd_block *block; |
1da177e4 | 1962 | |
8e09f215 SW |
1963 | block = queue->queuedata; |
1964 | spin_lock(&block->queue_lock); | |
1da177e4 | 1965 | /* Get new request from the block device request queue */ |
8e09f215 | 1966 | __dasd_process_request_queue(block); |
1da177e4 | 1967 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1968 | __dasd_block_start_head(block); |
1969 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
1970 | } |
1971 | ||
1972 | /* | |
1973 | * Allocate and initialize request queue and default I/O scheduler. | |
1974 | */ | |
8e09f215 | 1975 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
1976 | { |
1977 | int rc; | |
1978 | ||
8e09f215 SW |
1979 | block->request_queue = blk_init_queue(do_dasd_request, |
1980 | &block->request_queue_lock); | |
1981 | if (block->request_queue == NULL) | |
1da177e4 LT |
1982 | return -ENOMEM; |
1983 | ||
8e09f215 | 1984 | block->request_queue->queuedata = block; |
1da177e4 | 1985 | |
8e09f215 | 1986 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 1987 | block->request_queue->elevator = NULL; |
8e09f215 | 1988 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 1989 | if (rc) { |
8e09f215 | 1990 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
1991 | return rc; |
1992 | } | |
1993 | return 0; | |
1994 | } | |
1995 | ||
1996 | /* | |
1997 | * Allocate and initialize request queue. | |
1998 | */ | |
8e09f215 | 1999 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
2000 | { |
2001 | int max; | |
2002 | ||
8e09f215 SW |
2003 | blk_queue_hardsect_size(block->request_queue, block->bp_block); |
2004 | max = block->base->discipline->max_blocks << block->s2b_shift; | |
2005 | blk_queue_max_sectors(block->request_queue, max); | |
2006 | blk_queue_max_phys_segments(block->request_queue, -1L); | |
2007 | blk_queue_max_hw_segments(block->request_queue, -1L); | |
2008 | blk_queue_max_segment_size(block->request_queue, -1L); | |
2009 | blk_queue_segment_boundary(block->request_queue, -1L); | |
2010 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); | |
1da177e4 LT |
2011 | } |
2012 | ||
2013 | /* | |
2014 | * Deactivate and free request queue. | |
2015 | */ | |
8e09f215 | 2016 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2017 | { |
8e09f215 SW |
2018 | if (block->request_queue) { |
2019 | blk_cleanup_queue(block->request_queue); | |
2020 | block->request_queue = NULL; | |
1da177e4 LT |
2021 | } |
2022 | } | |
2023 | ||
2024 | /* | |
2025 | * Flush request on the request queue. | |
2026 | */ | |
8e09f215 | 2027 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2028 | { |
2029 | struct request *req; | |
2030 | ||
8e09f215 | 2031 | if (!block->request_queue) |
1da177e4 | 2032 | return; |
138c014d | 2033 | |
8e09f215 SW |
2034 | spin_lock_irq(&block->request_queue_lock); |
2035 | while ((req = elv_next_request(block->request_queue))) { | |
1da177e4 | 2036 | blkdev_dequeue_request(req); |
4c4e2148 | 2037 | dasd_end_request(req, -EIO); |
1da177e4 | 2038 | } |
8e09f215 | 2039 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2040 | } |
2041 | ||
57a7c0bc | 2042 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2043 | { |
57a7c0bc | 2044 | struct dasd_block *block = bdev->bd_disk->private_data; |
8e09f215 | 2045 | struct dasd_device *base = block->base; |
1da177e4 LT |
2046 | int rc; |
2047 | ||
8e09f215 SW |
2048 | atomic_inc(&block->open_count); |
2049 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2050 | rc = -ENODEV; |
2051 | goto unlock; | |
2052 | } | |
2053 | ||
8e09f215 | 2054 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2055 | rc = -EINVAL; |
2056 | goto unlock; | |
2057 | } | |
2058 | ||
2059 | if (dasd_probeonly) { | |
8e09f215 | 2060 | DEV_MESSAGE(KERN_INFO, base, "%s", |
1da177e4 LT |
2061 | "No access to device due to probeonly mode"); |
2062 | rc = -EPERM; | |
2063 | goto out; | |
2064 | } | |
2065 | ||
8e09f215 SW |
2066 | if (base->state <= DASD_STATE_BASIC) { |
2067 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2068 | " Cannot open unrecognized device"); |
2069 | rc = -ENODEV; | |
2070 | goto out; | |
2071 | } | |
2072 | ||
2073 | return 0; | |
2074 | ||
2075 | out: | |
8e09f215 | 2076 | module_put(base->discipline->owner); |
1da177e4 | 2077 | unlock: |
8e09f215 | 2078 | atomic_dec(&block->open_count); |
1da177e4 LT |
2079 | return rc; |
2080 | } | |
2081 | ||
57a7c0bc | 2082 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2083 | { |
8e09f215 | 2084 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2085 | |
8e09f215 SW |
2086 | atomic_dec(&block->open_count); |
2087 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2088 | return 0; |
2089 | } | |
2090 | ||
a885c8c4 CH |
2091 | /* |
2092 | * Return disk geometry. | |
2093 | */ | |
8e09f215 | 2094 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2095 | { |
8e09f215 SW |
2096 | struct dasd_block *block; |
2097 | struct dasd_device *base; | |
a885c8c4 | 2098 | |
8e09f215 SW |
2099 | block = bdev->bd_disk->private_data; |
2100 | base = block->base; | |
2101 | if (!block) | |
a885c8c4 CH |
2102 | return -ENODEV; |
2103 | ||
8e09f215 SW |
2104 | if (!base->discipline || |
2105 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2106 | return -EINVAL; |
2107 | ||
8e09f215 SW |
2108 | base->discipline->fill_geometry(block, geo); |
2109 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2110 | return 0; |
2111 | } | |
2112 | ||
1da177e4 LT |
2113 | struct block_device_operations |
2114 | dasd_device_operations = { | |
2115 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2116 | .open = dasd_open, |
2117 | .release = dasd_release, | |
2118 | .locked_ioctl = dasd_ioctl, | |
a885c8c4 | 2119 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2120 | }; |
2121 | ||
8e09f215 SW |
2122 | /******************************************************************************* |
2123 | * end of block device operations | |
2124 | */ | |
1da177e4 LT |
2125 | |
2126 | static void | |
2127 | dasd_exit(void) | |
2128 | { | |
2129 | #ifdef CONFIG_PROC_FS | |
2130 | dasd_proc_exit(); | |
2131 | #endif | |
20c64468 | 2132 | dasd_eer_exit(); |
6bb0e010 HH |
2133 | if (dasd_page_cache != NULL) { |
2134 | kmem_cache_destroy(dasd_page_cache); | |
2135 | dasd_page_cache = NULL; | |
2136 | } | |
1da177e4 LT |
2137 | dasd_gendisk_exit(); |
2138 | dasd_devmap_exit(); | |
1da177e4 LT |
2139 | if (dasd_debug_area != NULL) { |
2140 | debug_unregister(dasd_debug_area); | |
2141 | dasd_debug_area = NULL; | |
2142 | } | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * SECTION: common functions for ccw_driver use | |
2147 | */ | |
2148 | ||
1c01b8a5 HH |
2149 | /* |
2150 | * Initial attempt at a probe function. this can be simplified once | |
2151 | * the other detection code is gone. | |
2152 | */ | |
8e09f215 SW |
2153 | int dasd_generic_probe(struct ccw_device *cdev, |
2154 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2155 | { |
2156 | int ret; | |
2157 | ||
40545573 HH |
2158 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
2159 | if (ret) { | |
2160 | printk(KERN_WARNING | |
2161 | "dasd_generic_probe: could not set ccw-device options " | |
2a0217d5 | 2162 | "for %s\n", dev_name(&cdev->dev)); |
40545573 HH |
2163 | return ret; |
2164 | } | |
1da177e4 LT |
2165 | ret = dasd_add_sysfs_files(cdev); |
2166 | if (ret) { | |
2167 | printk(KERN_WARNING | |
2168 | "dasd_generic_probe: could not add sysfs entries " | |
2a0217d5 | 2169 | "for %s\n", dev_name(&cdev->dev)); |
40545573 | 2170 | return ret; |
1da177e4 | 2171 | } |
40545573 | 2172 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2173 | |
40545573 HH |
2174 | /* |
2175 | * Automatically online either all dasd devices (dasd_autodetect) | |
2176 | * or all devices specified with dasd= parameters during | |
2177 | * initial probe. | |
2178 | */ | |
2179 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2180 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
40545573 HH |
2181 | ret = ccw_device_set_online(cdev); |
2182 | if (ret) | |
2183 | printk(KERN_WARNING | |
de3e0da1 SH |
2184 | "dasd_generic_probe: could not initially " |
2185 | "online ccw-device %s; return code: %d\n", | |
2a0217d5 | 2186 | dev_name(&cdev->dev), ret); |
de3e0da1 | 2187 | return 0; |
1da177e4 LT |
2188 | } |
2189 | ||
1c01b8a5 HH |
2190 | /* |
2191 | * This will one day be called from a global not_oper handler. | |
2192 | * It is also used by driver_unregister during module unload. | |
2193 | */ | |
8e09f215 | 2194 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2195 | { |
2196 | struct dasd_device *device; | |
8e09f215 | 2197 | struct dasd_block *block; |
1da177e4 | 2198 | |
59afda78 HH |
2199 | cdev->handler = NULL; |
2200 | ||
1da177e4 LT |
2201 | dasd_remove_sysfs_files(cdev); |
2202 | device = dasd_device_from_cdev(cdev); | |
2203 | if (IS_ERR(device)) | |
2204 | return; | |
2205 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2206 | /* Already doing offline processing */ | |
2207 | dasd_put_device(device); | |
2208 | return; | |
2209 | } | |
2210 | /* | |
2211 | * This device is removed unconditionally. Set offline | |
2212 | * flag to prevent dasd_open from opening it while it is | |
2213 | * no quite down yet. | |
2214 | */ | |
2215 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2216 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2217 | block = device->block; |
2218 | device->block = NULL; | |
1da177e4 | 2219 | dasd_delete_device(device); |
8e09f215 SW |
2220 | /* |
2221 | * life cycle of block is bound to device, so delete it after | |
2222 | * device was safely removed | |
2223 | */ | |
2224 | if (block) | |
2225 | dasd_free_block(block); | |
1da177e4 LT |
2226 | } |
2227 | ||
1c01b8a5 HH |
2228 | /* |
2229 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2230 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2231 | * or the user has started activation through sysfs. |
2232 | */ | |
8e09f215 SW |
2233 | int dasd_generic_set_online(struct ccw_device *cdev, |
2234 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2235 | { |
aa88861f | 2236 | struct dasd_discipline *discipline; |
1da177e4 | 2237 | struct dasd_device *device; |
c6eb7b77 | 2238 | int rc; |
f24acd45 | 2239 | |
40545573 HH |
2240 | /* first online clears initial online feature flag */ |
2241 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2242 | device = dasd_create_device(cdev); |
2243 | if (IS_ERR(device)) | |
2244 | return PTR_ERR(device); | |
2245 | ||
aa88861f | 2246 | discipline = base_discipline; |
c6eb7b77 | 2247 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
2248 | if (!dasd_diag_discipline_pointer) { |
2249 | printk (KERN_WARNING | |
2250 | "dasd_generic couldn't online device %s " | |
2251 | "- discipline DIAG not available\n", | |
2a0217d5 | 2252 | dev_name(&cdev->dev)); |
1da177e4 LT |
2253 | dasd_delete_device(device); |
2254 | return -ENODEV; | |
2255 | } | |
2256 | discipline = dasd_diag_discipline_pointer; | |
2257 | } | |
aa88861f PO |
2258 | if (!try_module_get(base_discipline->owner)) { |
2259 | dasd_delete_device(device); | |
2260 | return -EINVAL; | |
2261 | } | |
2262 | if (!try_module_get(discipline->owner)) { | |
2263 | module_put(base_discipline->owner); | |
2264 | dasd_delete_device(device); | |
2265 | return -EINVAL; | |
2266 | } | |
2267 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2268 | device->discipline = discipline; |
2269 | ||
8e09f215 | 2270 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2271 | rc = discipline->check_device(device); |
2272 | if (rc) { | |
2273 | printk (KERN_WARNING | |
2274 | "dasd_generic couldn't online device %s " | |
2275 | "with discipline %s rc=%i\n", | |
2a0217d5 | 2276 | dev_name(&cdev->dev), discipline->name, rc); |
aa88861f PO |
2277 | module_put(discipline->owner); |
2278 | module_put(base_discipline->owner); | |
1da177e4 LT |
2279 | dasd_delete_device(device); |
2280 | return rc; | |
2281 | } | |
2282 | ||
2283 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2284 | if (device->state <= DASD_STATE_KNOWN) { | |
2285 | printk (KERN_WARNING | |
2286 | "dasd_generic discipline not found for %s\n", | |
2a0217d5 | 2287 | dev_name(&cdev->dev)); |
1da177e4 LT |
2288 | rc = -ENODEV; |
2289 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2290 | if (device->block) |
2291 | dasd_free_block(device->block); | |
1da177e4 LT |
2292 | dasd_delete_device(device); |
2293 | } else | |
2294 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2295 | dev_name(&cdev->dev)); |
1da177e4 LT |
2296 | |
2297 | /* FIXME: we have to wait for the root device but we don't want | |
2298 | * to wait for each single device but for all at once. */ | |
2299 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2300 | ||
2301 | dasd_put_device(device); | |
2302 | ||
2303 | return rc; | |
2304 | } | |
2305 | ||
8e09f215 | 2306 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2307 | { |
2308 | struct dasd_device *device; | |
8e09f215 | 2309 | struct dasd_block *block; |
dafd87aa | 2310 | int max_count, open_count; |
1da177e4 LT |
2311 | |
2312 | device = dasd_device_from_cdev(cdev); | |
2313 | if (IS_ERR(device)) | |
2314 | return PTR_ERR(device); | |
2315 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2316 | /* Already doing offline processing */ | |
2317 | dasd_put_device(device); | |
2318 | return 0; | |
2319 | } | |
2320 | /* | |
2321 | * We must make sure that this device is currently not in use. | |
2322 | * The open_count is increased for every opener, that includes | |
2323 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2324 | * in the other openers. | |
2325 | */ | |
8e09f215 | 2326 | if (device->block) { |
a806170e HC |
2327 | max_count = device->block->bdev ? 0 : -1; |
2328 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2329 | if (open_count > max_count) { |
2330 | if (open_count > 0) | |
2331 | printk(KERN_WARNING "Can't offline dasd " | |
2332 | "device with open count = %i.\n", | |
2333 | open_count); | |
2334 | else | |
2335 | printk(KERN_WARNING "%s", | |
2336 | "Can't offline dasd device due " | |
2337 | "to internal use\n"); | |
2338 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); | |
2339 | dasd_put_device(device); | |
2340 | return -EBUSY; | |
2341 | } | |
1da177e4 LT |
2342 | } |
2343 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2344 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2345 | block = device->block; |
2346 | device->block = NULL; | |
1da177e4 | 2347 | dasd_delete_device(device); |
8e09f215 SW |
2348 | /* |
2349 | * life cycle of block is bound to device, so delete it after | |
2350 | * device was safely removed | |
2351 | */ | |
2352 | if (block) | |
2353 | dasd_free_block(block); | |
1da177e4 LT |
2354 | return 0; |
2355 | } | |
2356 | ||
8e09f215 | 2357 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2358 | { |
2359 | struct dasd_device *device; | |
2360 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
2361 | int ret; |
2362 | ||
91c36919 | 2363 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2364 | if (IS_ERR(device)) |
2365 | return 0; | |
1da177e4 LT |
2366 | ret = 0; |
2367 | switch (event) { | |
2368 | case CIO_GONE: | |
2369 | case CIO_NO_PATH: | |
20c64468 SW |
2370 | /* First of all call extended error reporting. */ |
2371 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2372 | ||
1da177e4 LT |
2373 | if (device->state < DASD_STATE_BASIC) |
2374 | break; | |
2375 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2376 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2377 | if (cqr->status == DASD_CQR_IN_IO) { | |
2378 | cqr->status = DASD_CQR_QUEUED; | |
2379 | cqr->retries++; | |
2380 | } | |
2381 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2382 | dasd_device_clear_timer(device); | |
2383 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2384 | ret = 1; |
2385 | break; | |
2386 | case CIO_OPER: | |
2387 | /* FIXME: add a sanity check. */ | |
8e09f215 SW |
2388 | device->stopped &= ~DASD_STOPPED_DC_WAIT; |
2389 | dasd_schedule_device_bh(device); | |
2390 | if (device->block) | |
2391 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2392 | ret = 1; |
2393 | break; | |
2394 | } | |
1da177e4 LT |
2395 | dasd_put_device(device); |
2396 | return ret; | |
2397 | } | |
2398 | ||
763968e2 HC |
2399 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2400 | void *rdc_buffer, | |
2401 | int rdc_buffer_size, | |
2402 | char *magic) | |
17283b56 CH |
2403 | { |
2404 | struct dasd_ccw_req *cqr; | |
2405 | struct ccw1 *ccw; | |
2406 | ||
2407 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2408 | ||
2409 | if (IS_ERR(cqr)) { | |
2410 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
2411 | "Could not allocate RDC request"); | |
2412 | return cqr; | |
2413 | } | |
2414 | ||
2415 | ccw = cqr->cpaddr; | |
2416 | ccw->cmd_code = CCW_CMD_RDC; | |
2417 | ccw->cda = (__u32)(addr_t)rdc_buffer; | |
2418 | ccw->count = rdc_buffer_size; | |
2419 | ||
8e09f215 SW |
2420 | cqr->startdev = device; |
2421 | cqr->memdev = device; | |
17283b56 CH |
2422 | cqr->expires = 10*HZ; |
2423 | clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
2424 | cqr->retries = 2; | |
2425 | cqr->buildclk = get_clock(); | |
2426 | cqr->status = DASD_CQR_FILLED; | |
2427 | return cqr; | |
2428 | } | |
2429 | ||
2430 | ||
2431 | int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic, | |
2432 | void **rdc_buffer, int rdc_buffer_size) | |
2433 | { | |
2434 | int ret; | |
2435 | struct dasd_ccw_req *cqr; | |
2436 | ||
2437 | cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size, | |
2438 | magic); | |
2439 | if (IS_ERR(cqr)) | |
2440 | return PTR_ERR(cqr); | |
2441 | ||
2442 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2443 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2444 | return ret; |
2445 | } | |
aaff0f64 | 2446 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2447 | |
8e09f215 | 2448 | static int __init dasd_init(void) |
1da177e4 LT |
2449 | { |
2450 | int rc; | |
2451 | ||
2452 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2453 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2454 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2455 | |
2456 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2457 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2458 | if (dasd_debug_area == NULL) { |
2459 | rc = -ENOMEM; | |
2460 | goto failed; | |
2461 | } | |
2462 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2463 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2464 | |
2465 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2466 | ||
2467 | dasd_diag_discipline_pointer = NULL; | |
2468 | ||
1da177e4 LT |
2469 | rc = dasd_devmap_init(); |
2470 | if (rc) | |
2471 | goto failed; | |
2472 | rc = dasd_gendisk_init(); | |
2473 | if (rc) | |
2474 | goto failed; | |
2475 | rc = dasd_parse(); | |
2476 | if (rc) | |
2477 | goto failed; | |
20c64468 SW |
2478 | rc = dasd_eer_init(); |
2479 | if (rc) | |
2480 | goto failed; | |
1da177e4 LT |
2481 | #ifdef CONFIG_PROC_FS |
2482 | rc = dasd_proc_init(); | |
2483 | if (rc) | |
2484 | goto failed; | |
2485 | #endif | |
2486 | ||
2487 | return 0; | |
2488 | failed: | |
2489 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2490 | dasd_exit(); | |
2491 | return rc; | |
2492 | } | |
2493 | ||
2494 | module_init(dasd_init); | |
2495 | module_exit(dasd_exit); | |
2496 | ||
2497 | EXPORT_SYMBOL(dasd_debug_area); | |
2498 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2499 | ||
2500 | EXPORT_SYMBOL(dasd_add_request_head); | |
2501 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2502 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2503 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2504 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2505 | EXPORT_SYMBOL(dasd_enable_device); |
2506 | EXPORT_SYMBOL(dasd_int_handler); | |
2507 | EXPORT_SYMBOL(dasd_kfree_request); | |
2508 | EXPORT_SYMBOL(dasd_kick_device); | |
2509 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2510 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2511 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2512 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2513 | EXPORT_SYMBOL(dasd_device_set_timer); |
2514 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2515 | EXPORT_SYMBOL(dasd_sfree_request); |
2516 | EXPORT_SYMBOL(dasd_sleep_on); | |
2517 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2518 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2519 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2520 | EXPORT_SYMBOL(dasd_start_IO); | |
2521 | EXPORT_SYMBOL(dasd_term_IO); | |
2522 | ||
2523 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2524 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2525 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2526 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2527 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2528 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2529 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2530 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2531 | EXPORT_SYMBOL_GPL(dasd_free_block); |