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; | |
40 | ||
41 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
42 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
43 | " Copyright 2000 IBM Corporation"); | |
44 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
45 | MODULE_LICENSE("GPL"); |
46 | ||
47 | /* | |
48 | * SECTION: prototypes for static functions of dasd.c | |
49 | */ | |
50 | static int dasd_alloc_queue(struct dasd_device * device); | |
51 | static void dasd_setup_queue(struct dasd_device * device); | |
52 | static void dasd_free_queue(struct dasd_device * device); | |
53 | static void dasd_flush_request_queue(struct dasd_device *); | |
54 | static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); | |
8f61701b | 55 | static int dasd_flush_ccw_queue(struct dasd_device *, int); |
1da177e4 LT |
56 | static void dasd_tasklet(struct dasd_device *); |
57 | static void do_kick_device(void *data); | |
58 | ||
59 | /* | |
60 | * SECTION: Operations on the device structure. | |
61 | */ | |
62 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 63 | static wait_queue_head_t dasd_flush_wq; |
1da177e4 LT |
64 | |
65 | /* | |
66 | * Allocate memory for a new device structure. | |
67 | */ | |
68 | struct dasd_device * | |
69 | dasd_alloc_device(void) | |
70 | { | |
71 | struct dasd_device *device; | |
72 | ||
88abaab4 | 73 | device = kzalloc(sizeof (struct dasd_device), GFP_ATOMIC); |
1da177e4 LT |
74 | if (device == NULL) |
75 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
76 | /* open_count = 0 means device online but not in use */ |
77 | atomic_set(&device->open_count, -1); | |
78 | ||
79 | /* Get two pages for normal block device operations. */ | |
80 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
81 | if (device->ccw_mem == NULL) { | |
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); | |
87 | if (device->erp_mem == NULL) { | |
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); | |
96 | spin_lock_init(&device->request_queue_lock); | |
97 | atomic_set (&device->tasklet_scheduled, 0); | |
138c014d | 98 | tasklet_init(&device->tasklet, |
1da177e4 LT |
99 | (void (*)(unsigned long)) dasd_tasklet, |
100 | (unsigned long) device); | |
101 | INIT_LIST_HEAD(&device->ccw_queue); | |
102 | init_timer(&device->timer); | |
103 | INIT_WORK(&device->kick_work, do_kick_device, device); | |
104 | device->state = DASD_STATE_NEW; | |
105 | device->target = DASD_STATE_NEW; | |
106 | ||
107 | return device; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Free memory of a device structure. | |
112 | */ | |
113 | void | |
114 | dasd_free_device(struct dasd_device *device) | |
115 | { | |
17fd682e | 116 | kfree(device->private); |
1da177e4 LT |
117 | free_page((unsigned long) device->erp_mem); |
118 | free_pages((unsigned long) device->ccw_mem, 1); | |
119 | kfree(device); | |
120 | } | |
121 | ||
122 | /* | |
123 | * Make a new device known to the system. | |
124 | */ | |
8f61701b | 125 | static int |
1da177e4 LT |
126 | dasd_state_new_to_known(struct dasd_device *device) |
127 | { | |
128 | int rc; | |
129 | ||
130 | /* | |
138c014d | 131 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
132 | * keep the reference count > 0. |
133 | */ | |
134 | dasd_get_device(device); | |
135 | ||
136 | rc = dasd_alloc_queue(device); | |
137 | if (rc) { | |
138 | dasd_put_device(device); | |
139 | return rc; | |
140 | } | |
141 | ||
142 | device->state = DASD_STATE_KNOWN; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Let the system forget about a device. | |
148 | */ | |
8f61701b | 149 | static int |
1da177e4 LT |
150 | dasd_state_known_to_new(struct dasd_device * device) |
151 | { | |
20c64468 SW |
152 | /* Disable extended error reporting for this device. */ |
153 | dasd_eer_disable(device); | |
1da177e4 | 154 | /* Forget the discipline information. */ |
aa88861f PO |
155 | if (device->discipline) |
156 | module_put(device->discipline->owner); | |
1da177e4 | 157 | device->discipline = NULL; |
aa88861f PO |
158 | if (device->base_discipline) |
159 | module_put(device->base_discipline->owner); | |
160 | device->base_discipline = NULL; | |
1da177e4 LT |
161 | device->state = DASD_STATE_NEW; |
162 | ||
163 | dasd_free_queue(device); | |
164 | ||
165 | /* Give up reference we took in dasd_state_new_to_known. */ | |
166 | dasd_put_device(device); | |
8f61701b | 167 | return 0; |
1da177e4 LT |
168 | } |
169 | ||
170 | /* | |
171 | * Request the irq line for the device. | |
172 | */ | |
8f61701b | 173 | static int |
1da177e4 LT |
174 | dasd_state_known_to_basic(struct dasd_device * device) |
175 | { | |
176 | int rc; | |
177 | ||
178 | /* Allocate and register gendisk structure. */ | |
179 | rc = dasd_gendisk_alloc(device); | |
180 | if (rc) | |
181 | return rc; | |
182 | ||
183 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ | |
66a464db | 184 | device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 2, |
1da177e4 LT |
185 | 8 * sizeof (long)); |
186 | debug_register_view(device->debug_area, &debug_sprintf_view); | |
187 | debug_set_level(device->debug_area, DBF_EMERG); | |
188 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); | |
189 | ||
190 | device->state = DASD_STATE_BASIC; | |
191 | return 0; | |
192 | } | |
193 | ||
194 | /* | |
195 | * Release the irq line for the device. Terminate any running i/o. | |
196 | */ | |
8f61701b | 197 | static int |
1da177e4 LT |
198 | dasd_state_basic_to_known(struct dasd_device * device) |
199 | { | |
8f61701b HH |
200 | int rc; |
201 | ||
1da177e4 | 202 | dasd_gendisk_free(device); |
8f61701b HH |
203 | rc = dasd_flush_ccw_queue(device, 1); |
204 | if (rc) | |
205 | return rc; | |
206 | ||
1da177e4 LT |
207 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
208 | if (device->debug_area != NULL) { | |
209 | debug_unregister(device->debug_area); | |
210 | device->debug_area = NULL; | |
211 | } | |
212 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 213 | return 0; |
1da177e4 LT |
214 | } |
215 | ||
216 | /* | |
217 | * Do the initial analysis. The do_analysis function may return | |
218 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
219 | * until the discipline decides to continue the startup sequence | |
220 | * by calling the function dasd_change_state. The eckd disciplines | |
221 | * uses this to start a ccw that detects the format. The completion | |
222 | * interrupt for this detection ccw uses the kernel event daemon to | |
223 | * trigger the call to dasd_change_state. All this is done in the | |
224 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
225 | * After the analysis ccw is done (do_analysis returned 0) the block |
226 | * device is setup. | |
227 | * In case the analysis returns an error, the device setup is stopped | |
228 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 229 | */ |
8f61701b | 230 | static int |
1da177e4 LT |
231 | dasd_state_basic_to_ready(struct dasd_device * device) |
232 | { | |
233 | int rc; | |
234 | ||
235 | rc = 0; | |
236 | if (device->discipline->do_analysis != NULL) | |
237 | rc = device->discipline->do_analysis(device); | |
90f0094d HH |
238 | if (rc) { |
239 | if (rc != -EAGAIN) | |
240 | device->state = DASD_STATE_UNFMT; | |
1da177e4 | 241 | return rc; |
90f0094d HH |
242 | } |
243 | /* make disk known with correct capacity */ | |
1da177e4 | 244 | dasd_setup_queue(device); |
90f0094d | 245 | set_capacity(device->gdp, device->blocks << device->s2b_shift); |
1da177e4 | 246 | device->state = DASD_STATE_READY; |
90f0094d HH |
247 | rc = dasd_scan_partitions(device); |
248 | if (rc) | |
1da177e4 | 249 | device->state = DASD_STATE_BASIC; |
90f0094d | 250 | return rc; |
1da177e4 LT |
251 | } |
252 | ||
253 | /* | |
254 | * Remove device from block device layer. Destroy dirty buffers. | |
255 | * Forget format information. Check if the target level is basic | |
256 | * and if it is create fake disk for formatting. | |
257 | */ | |
8f61701b | 258 | static int |
1da177e4 LT |
259 | dasd_state_ready_to_basic(struct dasd_device * device) |
260 | { | |
8f61701b HH |
261 | int rc; |
262 | ||
263 | rc = dasd_flush_ccw_queue(device, 0); | |
264 | if (rc) | |
265 | return rc; | |
1da177e4 LT |
266 | dasd_destroy_partitions(device); |
267 | dasd_flush_request_queue(device); | |
268 | device->blocks = 0; | |
269 | device->bp_block = 0; | |
270 | device->s2b_shift = 0; | |
271 | device->state = DASD_STATE_BASIC; | |
8f61701b | 272 | return 0; |
1da177e4 LT |
273 | } |
274 | ||
90f0094d HH |
275 | /* |
276 | * Back to basic. | |
277 | */ | |
8f61701b | 278 | static int |
90f0094d HH |
279 | dasd_state_unfmt_to_basic(struct dasd_device * device) |
280 | { | |
281 | device->state = DASD_STATE_BASIC; | |
8f61701b | 282 | return 0; |
90f0094d HH |
283 | } |
284 | ||
1da177e4 LT |
285 | /* |
286 | * Make the device online and schedule the bottom half to start | |
287 | * the requeueing of requests from the linux request queue to the | |
288 | * ccw queue. | |
289 | */ | |
8f61701b | 290 | static int |
1da177e4 LT |
291 | dasd_state_ready_to_online(struct dasd_device * device) |
292 | { | |
293 | device->state = DASD_STATE_ONLINE; | |
294 | dasd_schedule_bh(device); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Stop the requeueing of requests again. | |
300 | */ | |
8f61701b | 301 | static int |
1da177e4 LT |
302 | dasd_state_online_to_ready(struct dasd_device * device) |
303 | { | |
304 | device->state = DASD_STATE_READY; | |
8f61701b | 305 | return 0; |
1da177e4 LT |
306 | } |
307 | ||
308 | /* | |
309 | * Device startup state changes. | |
310 | */ | |
8f61701b | 311 | static int |
1da177e4 LT |
312 | dasd_increase_state(struct dasd_device *device) |
313 | { | |
314 | int rc; | |
315 | ||
316 | rc = 0; | |
317 | if (device->state == DASD_STATE_NEW && | |
318 | device->target >= DASD_STATE_KNOWN) | |
319 | rc = dasd_state_new_to_known(device); | |
320 | ||
321 | if (!rc && | |
322 | device->state == DASD_STATE_KNOWN && | |
323 | device->target >= DASD_STATE_BASIC) | |
324 | rc = dasd_state_known_to_basic(device); | |
325 | ||
326 | if (!rc && | |
327 | device->state == DASD_STATE_BASIC && | |
328 | device->target >= DASD_STATE_READY) | |
329 | rc = dasd_state_basic_to_ready(device); | |
330 | ||
39ccf95e HH |
331 | if (!rc && |
332 | device->state == DASD_STATE_UNFMT && | |
333 | device->target > DASD_STATE_UNFMT) | |
334 | rc = -EPERM; | |
335 | ||
1da177e4 LT |
336 | if (!rc && |
337 | device->state == DASD_STATE_READY && | |
338 | device->target >= DASD_STATE_ONLINE) | |
339 | rc = dasd_state_ready_to_online(device); | |
340 | ||
341 | return rc; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Device shutdown state changes. | |
346 | */ | |
8f61701b | 347 | static int |
1da177e4 LT |
348 | dasd_decrease_state(struct dasd_device *device) |
349 | { | |
8f61701b HH |
350 | int rc; |
351 | ||
352 | rc = 0; | |
1da177e4 LT |
353 | if (device->state == DASD_STATE_ONLINE && |
354 | device->target <= DASD_STATE_READY) | |
8f61701b | 355 | rc = dasd_state_online_to_ready(device); |
138c014d | 356 | |
8f61701b HH |
357 | if (!rc && |
358 | device->state == DASD_STATE_READY && | |
1da177e4 | 359 | device->target <= DASD_STATE_BASIC) |
8f61701b | 360 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 361 | |
8f61701b HH |
362 | if (!rc && |
363 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 364 | device->target <= DASD_STATE_BASIC) |
8f61701b | 365 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 366 | |
8f61701b HH |
367 | if (!rc && |
368 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 369 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 370 | rc = dasd_state_basic_to_known(device); |
138c014d | 371 | |
8f61701b HH |
372 | if (!rc && |
373 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 374 | device->target <= DASD_STATE_NEW) |
8f61701b | 375 | rc = dasd_state_known_to_new(device); |
1da177e4 | 376 | |
8f61701b | 377 | return rc; |
1da177e4 LT |
378 | } |
379 | ||
380 | /* | |
381 | * This is the main startup/shutdown routine. | |
382 | */ | |
383 | static void | |
384 | dasd_change_state(struct dasd_device *device) | |
385 | { | |
386 | int rc; | |
387 | ||
388 | if (device->state == device->target) | |
389 | /* Already where we want to go today... */ | |
390 | return; | |
391 | if (device->state < device->target) | |
392 | rc = dasd_increase_state(device); | |
393 | else | |
394 | rc = dasd_decrease_state(device); | |
395 | if (rc && rc != -EAGAIN) | |
396 | device->target = device->state; | |
397 | ||
398 | if (device->state == device->target) | |
399 | wake_up(&dasd_init_waitq); | |
400 | } | |
401 | ||
402 | /* | |
403 | * Kick starter for devices that did not complete the startup/shutdown | |
404 | * procedure or were sleeping because of a pending state. | |
405 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
406 | * event daemon. | |
407 | */ | |
408 | static void | |
409 | do_kick_device(void *data) | |
410 | { | |
411 | struct dasd_device *device; | |
412 | ||
413 | device = (struct dasd_device *) data; | |
414 | dasd_change_state(device); | |
415 | dasd_schedule_bh(device); | |
416 | dasd_put_device(device); | |
417 | } | |
418 | ||
419 | void | |
420 | dasd_kick_device(struct dasd_device *device) | |
421 | { | |
422 | dasd_get_device(device); | |
423 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
424 | schedule_work(&device->kick_work); | |
425 | } | |
426 | ||
427 | /* | |
428 | * Set the target state for a device and starts the state change. | |
429 | */ | |
430 | void | |
431 | dasd_set_target_state(struct dasd_device *device, int target) | |
432 | { | |
433 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
434 | if (dasd_probeonly && target > DASD_STATE_READY) | |
435 | target = DASD_STATE_READY; | |
436 | if (device->target != target) { | |
437 | if (device->state == target) | |
438 | wake_up(&dasd_init_waitq); | |
439 | device->target = target; | |
440 | } | |
441 | if (device->state != device->target) | |
442 | dasd_change_state(device); | |
443 | } | |
444 | ||
445 | /* | |
446 | * Enable devices with device numbers in [from..to]. | |
447 | */ | |
448 | static inline int | |
449 | _wait_for_device(struct dasd_device *device) | |
450 | { | |
451 | return (device->state == device->target); | |
452 | } | |
453 | ||
454 | void | |
455 | dasd_enable_device(struct dasd_device *device) | |
456 | { | |
457 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
458 | if (device->state <= DASD_STATE_KNOWN) | |
459 | /* No discipline for device found. */ | |
460 | dasd_set_target_state(device, DASD_STATE_NEW); | |
461 | /* Now wait for the devices to come up. */ | |
462 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
463 | } | |
464 | ||
465 | /* | |
466 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
467 | */ | |
468 | #ifdef CONFIG_DASD_PROFILE | |
469 | ||
470 | struct dasd_profile_info_t dasd_global_profile; | |
471 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
472 | ||
473 | /* | |
474 | * Increments counter in global and local profiling structures. | |
475 | */ | |
476 | #define dasd_profile_counter(value, counter, device) \ | |
477 | { \ | |
478 | int index; \ | |
479 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
480 | dasd_global_profile.counter[index]++; \ | |
481 | device->profile.counter[index]++; \ | |
482 | } | |
483 | ||
484 | /* | |
485 | * Add profiling information for cqr before execution. | |
486 | */ | |
487 | static inline void | |
488 | dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
489 | struct request *req) | |
490 | { | |
491 | struct list_head *l; | |
492 | unsigned int counter; | |
493 | ||
494 | if (dasd_profile_level != DASD_PROFILE_ON) | |
495 | return; | |
496 | ||
497 | /* count the length of the chanq for statistics */ | |
498 | counter = 0; | |
499 | list_for_each(l, &device->ccw_queue) | |
500 | if (++counter >= 31) | |
501 | break; | |
502 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
503 | device->profile.dasd_io_nr_req[counter]++; | |
504 | } | |
505 | ||
506 | /* | |
507 | * Add profiling information for cqr after execution. | |
508 | */ | |
509 | static inline void | |
510 | dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
511 | struct request *req) | |
512 | { | |
513 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
514 | long tottimeps, sectors; | |
515 | ||
516 | if (dasd_profile_level != DASD_PROFILE_ON) | |
517 | return; | |
518 | ||
519 | sectors = req->nr_sectors; | |
520 | if (!cqr->buildclk || !cqr->startclk || | |
521 | !cqr->stopclk || !cqr->endclk || | |
522 | !sectors) | |
523 | return; | |
524 | ||
525 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
526 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
527 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
528 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
529 | tottimeps = tottime / sectors; | |
530 | ||
531 | if (!dasd_global_profile.dasd_io_reqs) | |
532 | memset(&dasd_global_profile, 0, | |
533 | sizeof (struct dasd_profile_info_t)); | |
534 | dasd_global_profile.dasd_io_reqs++; | |
535 | dasd_global_profile.dasd_io_sects += sectors; | |
536 | ||
537 | if (!device->profile.dasd_io_reqs) | |
538 | memset(&device->profile, 0, | |
539 | sizeof (struct dasd_profile_info_t)); | |
540 | device->profile.dasd_io_reqs++; | |
541 | device->profile.dasd_io_sects += sectors; | |
542 | ||
543 | dasd_profile_counter(sectors, dasd_io_secs, device); | |
544 | dasd_profile_counter(tottime, dasd_io_times, device); | |
545 | dasd_profile_counter(tottimeps, dasd_io_timps, device); | |
546 | dasd_profile_counter(strtime, dasd_io_time1, device); | |
547 | dasd_profile_counter(irqtime, dasd_io_time2, device); | |
548 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device); | |
549 | dasd_profile_counter(endtime, dasd_io_time3, device); | |
550 | } | |
551 | #else | |
552 | #define dasd_profile_start(device, cqr, req) do {} while (0) | |
553 | #define dasd_profile_end(device, cqr, req) do {} while (0) | |
554 | #endif /* CONFIG_DASD_PROFILE */ | |
555 | ||
556 | /* | |
557 | * Allocate memory for a channel program with 'cplength' channel | |
558 | * command words and 'datasize' additional space. There are two | |
559 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
560 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
561 | * that gets allocated for each device. | |
562 | */ | |
563 | struct dasd_ccw_req * | |
564 | dasd_kmalloc_request(char *magic, int cplength, int datasize, | |
565 | struct dasd_device * device) | |
566 | { | |
567 | struct dasd_ccw_req *cqr; | |
568 | ||
569 | /* Sanity checks */ | |
7ac1e877 ES |
570 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
571 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 572 | |
88abaab4 | 573 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
574 | if (cqr == NULL) |
575 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
576 | cqr->cpaddr = NULL; |
577 | if (cplength > 0) { | |
88abaab4 | 578 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
579 | GFP_ATOMIC | GFP_DMA); |
580 | if (cqr->cpaddr == NULL) { | |
581 | kfree(cqr); | |
582 | return ERR_PTR(-ENOMEM); | |
583 | } | |
1da177e4 LT |
584 | } |
585 | cqr->data = NULL; | |
586 | if (datasize > 0) { | |
88abaab4 | 587 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 588 | if (cqr->data == NULL) { |
17fd682e | 589 | kfree(cqr->cpaddr); |
1da177e4 LT |
590 | kfree(cqr); |
591 | return ERR_PTR(-ENOMEM); | |
592 | } | |
1da177e4 LT |
593 | } |
594 | strncpy((char *) &cqr->magic, magic, 4); | |
595 | ASCEBC((char *) &cqr->magic, 4); | |
596 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
597 | dasd_get_device(device); | |
598 | return cqr; | |
599 | } | |
600 | ||
601 | struct dasd_ccw_req * | |
602 | dasd_smalloc_request(char *magic, int cplength, int datasize, | |
603 | struct dasd_device * device) | |
604 | { | |
605 | unsigned long flags; | |
606 | struct dasd_ccw_req *cqr; | |
607 | char *data; | |
608 | int size; | |
609 | ||
610 | /* Sanity checks */ | |
7ac1e877 ES |
611 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
612 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
613 | |
614 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
615 | if (cplength > 0) | |
616 | size += cplength * sizeof(struct ccw1); | |
617 | if (datasize > 0) | |
618 | size += datasize; | |
619 | spin_lock_irqsave(&device->mem_lock, flags); | |
620 | cqr = (struct dasd_ccw_req *) | |
621 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
622 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
623 | if (cqr == NULL) | |
624 | return ERR_PTR(-ENOMEM); | |
625 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
626 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
627 | cqr->cpaddr = NULL; | |
628 | if (cplength > 0) { | |
629 | cqr->cpaddr = (struct ccw1 *) data; | |
630 | data += cplength*sizeof(struct ccw1); | |
631 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
632 | } | |
633 | cqr->data = NULL; | |
634 | if (datasize > 0) { | |
635 | cqr->data = data; | |
636 | memset(cqr->data, 0, datasize); | |
637 | } | |
638 | strncpy((char *) &cqr->magic, magic, 4); | |
639 | ASCEBC((char *) &cqr->magic, 4); | |
640 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
641 | dasd_get_device(device); | |
642 | return cqr; | |
643 | } | |
644 | ||
645 | /* | |
646 | * Free memory of a channel program. This function needs to free all the | |
647 | * idal lists that might have been created by dasd_set_cda and the | |
648 | * struct dasd_ccw_req itself. | |
649 | */ | |
650 | void | |
651 | dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
652 | { | |
347a8dc3 | 653 | #ifdef CONFIG_64BIT |
1da177e4 LT |
654 | struct ccw1 *ccw; |
655 | ||
656 | /* Clear any idals used for the request. */ | |
657 | ccw = cqr->cpaddr; | |
658 | do { | |
659 | clear_normalized_cda(ccw); | |
660 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
661 | #endif | |
17fd682e JJ |
662 | kfree(cqr->cpaddr); |
663 | kfree(cqr->data); | |
1da177e4 LT |
664 | kfree(cqr); |
665 | dasd_put_device(device); | |
666 | } | |
667 | ||
668 | void | |
669 | dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
670 | { | |
671 | unsigned long flags; | |
672 | ||
673 | spin_lock_irqsave(&device->mem_lock, flags); | |
674 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
675 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
676 | dasd_put_device(device); | |
677 | } | |
678 | ||
679 | /* | |
680 | * Check discipline magic in cqr. | |
681 | */ | |
682 | static inline int | |
683 | dasd_check_cqr(struct dasd_ccw_req *cqr) | |
684 | { | |
685 | struct dasd_device *device; | |
686 | ||
687 | if (cqr == NULL) | |
688 | return -EINVAL; | |
689 | device = cqr->device; | |
690 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { | |
691 | DEV_MESSAGE(KERN_WARNING, device, | |
692 | " dasd_ccw_req 0x%08x magic doesn't match" | |
693 | " discipline 0x%08x", | |
694 | cqr->magic, | |
695 | *(unsigned int *) device->discipline->name); | |
696 | return -EINVAL; | |
697 | } | |
698 | return 0; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Terminate the current i/o and set the request to clear_pending. | |
703 | * Timer keeps device runnig. | |
704 | * ccw_device_clear can fail if the i/o subsystem | |
705 | * is in a bad mood. | |
706 | */ | |
707 | int | |
708 | dasd_term_IO(struct dasd_ccw_req * cqr) | |
709 | { | |
710 | struct dasd_device *device; | |
711 | int retries, rc; | |
712 | ||
713 | /* Check the cqr */ | |
714 | rc = dasd_check_cqr(cqr); | |
715 | if (rc) | |
716 | return rc; | |
717 | retries = 0; | |
718 | device = (struct dasd_device *) cqr->device; | |
719 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { | |
720 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
721 | switch (rc) { | |
722 | case 0: /* termination successful */ | |
c2ba444d HH |
723 | cqr->retries--; |
724 | cqr->status = DASD_CQR_CLEAR; | |
1da177e4 | 725 | cqr->stopclk = get_clock(); |
8f61701b | 726 | cqr->starttime = 0; |
1da177e4 LT |
727 | DBF_DEV_EVENT(DBF_DEBUG, device, |
728 | "terminate cqr %p successful", | |
729 | cqr); | |
730 | break; | |
731 | case -ENODEV: | |
732 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
733 | "device gone, retry"); | |
734 | break; | |
735 | case -EIO: | |
736 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
737 | "I/O error, retry"); | |
738 | break; | |
739 | case -EINVAL: | |
740 | case -EBUSY: | |
741 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
742 | "device busy, retry later"); | |
743 | break; | |
744 | default: | |
745 | DEV_MESSAGE(KERN_ERR, device, | |
746 | "line %d unknown RC=%d, please " | |
747 | "report to linux390@de.ibm.com", | |
748 | __LINE__, rc); | |
749 | BUG(); | |
750 | break; | |
751 | } | |
752 | retries++; | |
753 | } | |
754 | dasd_schedule_bh(device); | |
755 | return rc; | |
756 | } | |
757 | ||
758 | /* | |
759 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
760 | * In that case set up a timer to start the request later. | |
761 | */ | |
762 | int | |
763 | dasd_start_IO(struct dasd_ccw_req * cqr) | |
764 | { | |
765 | struct dasd_device *device; | |
766 | int rc; | |
767 | ||
768 | /* Check the cqr */ | |
769 | rc = dasd_check_cqr(cqr); | |
770 | if (rc) | |
771 | return rc; | |
772 | device = (struct dasd_device *) cqr->device; | |
773 | if (cqr->retries < 0) { | |
774 | DEV_MESSAGE(KERN_DEBUG, device, | |
775 | "start_IO: request %p (%02x/%i) - no retry left.", | |
776 | cqr, cqr->status, cqr->retries); | |
777 | cqr->status = DASD_CQR_FAILED; | |
778 | return -EIO; | |
779 | } | |
780 | cqr->startclk = get_clock(); | |
781 | cqr->starttime = jiffies; | |
782 | cqr->retries--; | |
783 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
784 | cqr->lpm, 0); | |
785 | switch (rc) { | |
786 | case 0: | |
787 | cqr->status = DASD_CQR_IN_IO; | |
788 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
789 | "start_IO: request %p started successful", | |
790 | cqr); | |
791 | break; | |
792 | case -EBUSY: | |
793 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
794 | "start_IO: device busy, retry later"); | |
795 | break; | |
796 | case -ETIMEDOUT: | |
797 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
798 | "start_IO: request timeout, retry later"); | |
799 | break; | |
800 | case -EACCES: | |
801 | /* -EACCES indicates that the request used only a | |
802 | * subset of the available pathes and all these | |
803 | * pathes are gone. | |
804 | * Do a retry with all available pathes. | |
805 | */ | |
806 | cqr->lpm = LPM_ANYPATH; | |
807 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
808 | "start_IO: selected pathes gone," | |
809 | " retry on all pathes"); | |
810 | break; | |
811 | case -ENODEV: | |
812 | case -EIO: | |
813 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
814 | "start_IO: device gone, retry"); | |
815 | break; | |
816 | default: | |
817 | DEV_MESSAGE(KERN_ERR, device, | |
818 | "line %d unknown RC=%d, please report" | |
819 | " to linux390@de.ibm.com", __LINE__, rc); | |
820 | BUG(); | |
821 | break; | |
822 | } | |
823 | return rc; | |
824 | } | |
825 | ||
826 | /* | |
827 | * Timeout function for dasd devices. This is used for different purposes | |
828 | * 1) missing interrupt handler for normal operation | |
829 | * 2) delayed start of request where start_IO failed with -EBUSY | |
830 | * 3) timeout for missing state change interrupts | |
831 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
832 | * DASD_CQR_QUEUED for 2) and 3). | |
833 | */ | |
834 | static void | |
835 | dasd_timeout_device(unsigned long ptr) | |
836 | { | |
837 | unsigned long flags; | |
838 | struct dasd_device *device; | |
839 | ||
840 | device = (struct dasd_device *) ptr; | |
841 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
842 | /* re-activate request queue */ | |
843 | device->stopped &= ~DASD_STOPPED_PENDING; | |
844 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
845 | dasd_schedule_bh(device); | |
846 | } | |
847 | ||
848 | /* | |
849 | * Setup timeout for a device in jiffies. | |
850 | */ | |
851 | void | |
852 | dasd_set_timer(struct dasd_device *device, int expires) | |
853 | { | |
854 | if (expires == 0) { | |
855 | if (timer_pending(&device->timer)) | |
856 | del_timer(&device->timer); | |
857 | return; | |
858 | } | |
859 | if (timer_pending(&device->timer)) { | |
860 | if (mod_timer(&device->timer, jiffies + expires)) | |
861 | return; | |
862 | } | |
863 | device->timer.function = dasd_timeout_device; | |
864 | device->timer.data = (unsigned long) device; | |
865 | device->timer.expires = jiffies + expires; | |
866 | add_timer(&device->timer); | |
867 | } | |
868 | ||
869 | /* | |
870 | * Clear timeout for a device. | |
871 | */ | |
872 | void | |
873 | dasd_clear_timer(struct dasd_device *device) | |
874 | { | |
875 | if (timer_pending(&device->timer)) | |
876 | del_timer(&device->timer); | |
877 | } | |
878 | ||
879 | static void | |
880 | dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm) | |
881 | { | |
882 | struct dasd_ccw_req *cqr; | |
883 | struct dasd_device *device; | |
884 | ||
885 | cqr = (struct dasd_ccw_req *) intparm; | |
886 | if (cqr->status != DASD_CQR_IN_IO) { | |
887 | MESSAGE(KERN_DEBUG, | |
888 | "invalid status in handle_killed_request: " | |
889 | "bus_id %s, status %02x", | |
890 | cdev->dev.bus_id, cqr->status); | |
891 | return; | |
892 | } | |
893 | ||
894 | device = (struct dasd_device *) cqr->device; | |
895 | if (device == NULL || | |
a00bfd71 | 896 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 LT |
897 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
898 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
899 | cdev->dev.bus_id); | |
900 | return; | |
901 | } | |
902 | ||
903 | /* Schedule request to be retried. */ | |
904 | cqr->status = DASD_CQR_QUEUED; | |
905 | ||
906 | dasd_clear_timer(device); | |
907 | dasd_schedule_bh(device); | |
908 | dasd_put_device(device); | |
909 | } | |
910 | ||
911 | static void | |
912 | dasd_handle_state_change_pending(struct dasd_device *device) | |
913 | { | |
914 | struct dasd_ccw_req *cqr; | |
915 | struct list_head *l, *n; | |
916 | ||
20c64468 SW |
917 | /* First of all start sense subsystem status request. */ |
918 | dasd_eer_snss(device); | |
919 | ||
1da177e4 LT |
920 | device->stopped &= ~DASD_STOPPED_PENDING; |
921 | ||
922 | /* restart all 'running' IO on queue */ | |
923 | list_for_each_safe(l, n, &device->ccw_queue) { | |
924 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
925 | if (cqr->status == DASD_CQR_IN_IO) { | |
926 | cqr->status = DASD_CQR_QUEUED; | |
927 | } | |
928 | } | |
929 | dasd_clear_timer(device); | |
930 | dasd_schedule_bh(device); | |
931 | } | |
932 | ||
933 | /* | |
934 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
935 | */ | |
936 | void | |
937 | dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
938 | struct irb *irb) | |
939 | { | |
940 | struct dasd_ccw_req *cqr, *next; | |
941 | struct dasd_device *device; | |
942 | unsigned long long now; | |
943 | int expires; | |
944 | dasd_era_t era; | |
945 | char mask; | |
946 | ||
947 | if (IS_ERR(irb)) { | |
948 | switch (PTR_ERR(irb)) { | |
949 | case -EIO: | |
950 | dasd_handle_killed_request(cdev, intparm); | |
951 | break; | |
952 | case -ETIMEDOUT: | |
953 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
954 | __FUNCTION__, cdev->dev.bus_id); | |
955 | //FIXME - dasd uses own timeout interface... | |
956 | break; | |
957 | default: | |
958 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
959 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); | |
960 | } | |
961 | return; | |
962 | } | |
963 | ||
964 | now = get_clock(); | |
965 | ||
966 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
967 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), | |
968 | (unsigned int) intparm); | |
969 | ||
970 | /* first of all check for state change pending interrupt */ | |
971 | mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; | |
972 | if ((irb->scsw.dstat & mask) == mask) { | |
a00bfd71 | 973 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
974 | if (!IS_ERR(device)) { |
975 | dasd_handle_state_change_pending(device); | |
976 | dasd_put_device(device); | |
977 | } | |
978 | return; | |
979 | } | |
980 | ||
981 | cqr = (struct dasd_ccw_req *) intparm; | |
982 | ||
983 | /* check for unsolicited interrupts */ | |
984 | if (cqr == NULL) { | |
985 | MESSAGE(KERN_DEBUG, | |
986 | "unsolicited interrupt received: bus_id %s", | |
987 | cdev->dev.bus_id); | |
988 | return; | |
989 | } | |
990 | ||
991 | device = (struct dasd_device *) cqr->device; | |
992 | if (device == NULL || | |
993 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
994 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
995 | cdev->dev.bus_id); | |
996 | return; | |
997 | } | |
998 | ||
999 | /* Check for clear pending */ | |
1000 | if (cqr->status == DASD_CQR_CLEAR && | |
1001 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { | |
1002 | cqr->status = DASD_CQR_QUEUED; | |
1003 | dasd_clear_timer(device); | |
8f61701b | 1004 | wake_up(&dasd_flush_wq); |
1da177e4 LT |
1005 | dasd_schedule_bh(device); |
1006 | return; | |
1007 | } | |
1008 | ||
1009 | /* check status - the request might have been killed by dyn detach */ | |
1010 | if (cqr->status != DASD_CQR_IN_IO) { | |
1011 | MESSAGE(KERN_DEBUG, | |
1012 | "invalid status: bus_id %s, status %02x", | |
1013 | cdev->dev.bus_id, cqr->status); | |
1014 | return; | |
1015 | } | |
1016 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
1017 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); | |
1018 | ||
1019 | /* Find out the appropriate era_action. */ | |
138c014d | 1020 | if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) |
1da177e4 LT |
1021 | era = dasd_era_fatal; |
1022 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
1023 | irb->scsw.cstat == 0 && | |
1024 | !irb->esw.esw0.erw.cons) | |
1025 | era = dasd_era_none; | |
1026 | else if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) | |
1027 | era = dasd_era_fatal; /* don't recover this request */ | |
1028 | else if (irb->esw.esw0.erw.cons) | |
1029 | era = device->discipline->examine_error(cqr, irb); | |
138c014d | 1030 | else |
1da177e4 LT |
1031 | era = dasd_era_recover; |
1032 | ||
1033 | DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); | |
1034 | expires = 0; | |
1035 | if (era == dasd_era_none) { | |
1036 | cqr->status = DASD_CQR_DONE; | |
1037 | cqr->stopclk = now; | |
1038 | /* Start first request on queue if possible -> fast_io. */ | |
1039 | if (cqr->list.next != &device->ccw_queue) { | |
1040 | next = list_entry(cqr->list.next, | |
1041 | struct dasd_ccw_req, list); | |
1042 | if ((next->status == DASD_CQR_QUEUED) && | |
1043 | (!device->stopped)) { | |
1044 | if (device->discipline->start_IO(next) == 0) | |
1045 | expires = next->expires; | |
1046 | else | |
1047 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1048 | "Interrupt fastpath " | |
1049 | "failed!"); | |
1050 | } | |
1051 | } | |
1052 | } else { /* error */ | |
1053 | memcpy(&cqr->irb, irb, sizeof (struct irb)); | |
1054 | #ifdef ERP_DEBUG | |
1055 | /* dump sense data */ | |
1056 | dasd_log_sense(cqr, irb); | |
1057 | #endif | |
1058 | switch (era) { | |
1059 | case dasd_era_fatal: | |
1060 | cqr->status = DASD_CQR_FAILED; | |
1061 | cqr->stopclk = now; | |
1062 | break; | |
1063 | case dasd_era_recover: | |
1064 | cqr->status = DASD_CQR_ERROR; | |
1065 | break; | |
1066 | default: | |
1067 | BUG(); | |
1068 | } | |
1069 | } | |
1070 | if (expires != 0) | |
1071 | dasd_set_timer(device, expires); | |
1072 | else | |
1073 | dasd_clear_timer(device); | |
1074 | dasd_schedule_bh(device); | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * posts the buffer_cache about a finalized request | |
1079 | */ | |
1080 | static inline void | |
1081 | dasd_end_request(struct request *req, int uptodate) | |
1082 | { | |
1083 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) | |
1084 | BUG(); | |
1085 | add_disk_randomness(req->rq_disk); | |
8ffdc655 | 1086 | end_that_request_last(req, uptodate); |
1da177e4 LT |
1087 | } |
1088 | ||
1089 | /* | |
1090 | * Process finished error recovery ccw. | |
1091 | */ | |
1092 | static inline void | |
1093 | __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr) | |
1094 | { | |
1095 | dasd_erp_fn_t erp_fn; | |
1096 | ||
1097 | if (cqr->status == DASD_CQR_DONE) | |
1098 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1099 | else | |
1100 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1101 | erp_fn = device->discipline->erp_postaction(cqr); | |
1102 | erp_fn(cqr); | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Process ccw request queue. | |
1107 | */ | |
1108 | static inline void | |
1109 | __dasd_process_ccw_queue(struct dasd_device * device, | |
1110 | struct list_head *final_queue) | |
1111 | { | |
1112 | struct list_head *l, *n; | |
1113 | struct dasd_ccw_req *cqr; | |
1114 | dasd_erp_fn_t erp_fn; | |
1115 | ||
1116 | restart: | |
1117 | /* Process request with final status. */ | |
1118 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1119 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1120 | /* Stop list processing at the first non-final request. */ | |
1121 | if (cqr->status != DASD_CQR_DONE && | |
1122 | cqr->status != DASD_CQR_FAILED && | |
1123 | cqr->status != DASD_CQR_ERROR) | |
1124 | break; | |
1125 | /* Process requests with DASD_CQR_ERROR */ | |
1126 | if (cqr->status == DASD_CQR_ERROR) { | |
1127 | if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) { | |
1128 | cqr->status = DASD_CQR_FAILED; | |
1129 | cqr->stopclk = get_clock(); | |
1130 | } else { | |
1131 | if (cqr->irb.esw.esw0.erw.cons) { | |
1132 | erp_fn = device->discipline-> | |
1133 | erp_action(cqr); | |
1134 | erp_fn(cqr); | |
1135 | } else | |
1136 | dasd_default_erp_action(cqr); | |
1137 | } | |
1138 | goto restart; | |
1139 | } | |
20c64468 SW |
1140 | |
1141 | /* First of all call extended error reporting. */ | |
1142 | if (dasd_eer_enabled(device) && | |
1143 | cqr->status == DASD_CQR_FAILED) { | |
1144 | dasd_eer_write(device, cqr, DASD_EER_FATALERROR); | |
1145 | ||
1146 | /* restart request */ | |
1147 | cqr->status = DASD_CQR_QUEUED; | |
1148 | cqr->retries = 255; | |
1149 | device->stopped |= DASD_STOPPED_QUIESCE; | |
1150 | goto restart; | |
1151 | } | |
1152 | ||
1da177e4 LT |
1153 | /* Process finished ERP request. */ |
1154 | if (cqr->refers) { | |
1155 | __dasd_process_erp(device, cqr); | |
1156 | goto restart; | |
1157 | } | |
1158 | ||
1159 | /* Rechain finished requests to final queue */ | |
1160 | cqr->endclk = get_clock(); | |
1161 | list_move_tail(&cqr->list, final_queue); | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | static void | |
1166 | dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data) | |
1167 | { | |
1168 | struct request *req; | |
1169 | struct dasd_device *device; | |
1170 | int status; | |
1171 | ||
1172 | req = (struct request *) data; | |
1173 | device = cqr->device; | |
1174 | dasd_profile_end(device, cqr, req); | |
1175 | status = cqr->device->discipline->free_cp(cqr,req); | |
1176 | spin_lock_irq(&device->request_queue_lock); | |
1177 | dasd_end_request(req, status); | |
1178 | spin_unlock_irq(&device->request_queue_lock); | |
1179 | } | |
1180 | ||
1181 | ||
1182 | /* | |
1183 | * Fetch requests from the block device queue. | |
1184 | */ | |
1185 | static inline void | |
1186 | __dasd_process_blk_queue(struct dasd_device * device) | |
1187 | { | |
1188 | request_queue_t *queue; | |
1189 | struct request *req; | |
1190 | struct dasd_ccw_req *cqr; | |
c6eb7b77 | 1191 | int nr_queued; |
1da177e4 LT |
1192 | |
1193 | queue = device->request_queue; | |
1194 | /* No queue ? Then there is nothing to do. */ | |
1195 | if (queue == NULL) | |
1196 | return; | |
1197 | ||
1198 | /* | |
1199 | * We requeue request from the block device queue to the ccw | |
1200 | * queue only in two states. In state DASD_STATE_READY the | |
1201 | * partition detection is done and we need to requeue requests | |
1202 | * for that. State DASD_STATE_ONLINE is normal block device | |
1203 | * operation. | |
1204 | */ | |
1205 | if (device->state != DASD_STATE_READY && | |
1206 | device->state != DASD_STATE_ONLINE) | |
1207 | return; | |
1208 | nr_queued = 0; | |
1209 | /* Now we try to fetch requests from the request queue */ | |
1210 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1211 | if (cqr->status == DASD_CQR_QUEUED) | |
1212 | nr_queued++; | |
1213 | while (!blk_queue_plugged(queue) && | |
1214 | elv_next_request(queue) && | |
1215 | nr_queued < DASD_CHANQ_MAX_SIZE) { | |
1216 | req = elv_next_request(queue); | |
f24acd45 | 1217 | |
c6eb7b77 HH |
1218 | if (device->features & DASD_FEATURE_READONLY && |
1219 | rq_data_dir(req) == WRITE) { | |
1da177e4 LT |
1220 | DBF_DEV_EVENT(DBF_ERR, device, |
1221 | "Rejecting write request %p", | |
1222 | req); | |
1223 | blkdev_dequeue_request(req); | |
1224 | dasd_end_request(req, 0); | |
1225 | continue; | |
1226 | } | |
1227 | if (device->stopped & DASD_STOPPED_DC_EIO) { | |
1228 | blkdev_dequeue_request(req); | |
1229 | dasd_end_request(req, 0); | |
1230 | continue; | |
1231 | } | |
1232 | cqr = device->discipline->build_cp(device, req); | |
1233 | if (IS_ERR(cqr)) { | |
1234 | if (PTR_ERR(cqr) == -ENOMEM) | |
1235 | break; /* terminate request queue loop */ | |
1236 | DBF_DEV_EVENT(DBF_ERR, device, | |
1237 | "CCW creation failed (rc=%ld) " | |
1238 | "on request %p", | |
1239 | PTR_ERR(cqr), req); | |
1240 | blkdev_dequeue_request(req); | |
1241 | dasd_end_request(req, 0); | |
1242 | continue; | |
1243 | } | |
1244 | cqr->callback = dasd_end_request_cb; | |
1245 | cqr->callback_data = (void *) req; | |
1246 | cqr->status = DASD_CQR_QUEUED; | |
1247 | blkdev_dequeue_request(req); | |
1248 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1249 | dasd_profile_start(device, cqr, req); | |
1250 | nr_queued++; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Take a look at the first request on the ccw queue and check | |
1256 | * if it reached its expire time. If so, terminate the IO. | |
1257 | */ | |
1258 | static inline void | |
1259 | __dasd_check_expire(struct dasd_device * device) | |
1260 | { | |
1261 | struct dasd_ccw_req *cqr; | |
1262 | ||
1263 | if (list_empty(&device->ccw_queue)) | |
1264 | return; | |
1265 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1266 | if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) { | |
1267 | if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) { | |
8f61701b HH |
1268 | DEV_MESSAGE(KERN_ERR, device, |
1269 | "internal error - timeout (%is) expired " | |
1270 | "for cqr %p (%i retries left)", | |
1271 | (cqr->expires/HZ), cqr, cqr->retries); | |
1da177e4 LT |
1272 | if (device->discipline->term_IO(cqr) != 0) |
1273 | /* Hmpf, try again in 1/10 sec */ | |
1274 | dasd_set_timer(device, 10); | |
1275 | } | |
1276 | } | |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * Take a look at the first request on the ccw queue and check | |
1281 | * if it needs to be started. | |
1282 | */ | |
1283 | static inline void | |
1284 | __dasd_start_head(struct dasd_device * device) | |
1285 | { | |
1286 | struct dasd_ccw_req *cqr; | |
1287 | int rc; | |
1288 | ||
1289 | if (list_empty(&device->ccw_queue)) | |
1290 | return; | |
1291 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
25ee4cf8 PO |
1292 | if (cqr->status != DASD_CQR_QUEUED) |
1293 | return; | |
1294 | /* Non-temporary stop condition will trigger fail fast */ | |
1c01b8a5 | 1295 | if (device->stopped & ~DASD_STOPPED_PENDING && |
20c64468 SW |
1296 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
1297 | (!dasd_eer_enabled(device))) { | |
1c01b8a5 HH |
1298 | cqr->status = DASD_CQR_FAILED; |
1299 | dasd_schedule_bh(device); | |
25ee4cf8 | 1300 | return; |
1c01b8a5 | 1301 | } |
25ee4cf8 PO |
1302 | /* Don't try to start requests if device is stopped */ |
1303 | if (device->stopped) | |
1304 | return; | |
1305 | ||
1306 | rc = device->discipline->start_IO(cqr); | |
1307 | if (rc == 0) | |
1308 | dasd_set_timer(device, cqr->expires); | |
1309 | else if (rc == -EACCES) { | |
1310 | dasd_schedule_bh(device); | |
1311 | } else | |
1312 | /* Hmpf, try again in 1/2 sec */ | |
1313 | dasd_set_timer(device, 50); | |
1da177e4 LT |
1314 | } |
1315 | ||
8f61701b HH |
1316 | static inline int |
1317 | _wait_for_clear(struct dasd_ccw_req *cqr) | |
1318 | { | |
1319 | return (cqr->status == DASD_CQR_QUEUED); | |
1320 | } | |
1321 | ||
1da177e4 | 1322 | /* |
8f61701b HH |
1323 | * Remove all requests from the ccw queue (all = '1') or only block device |
1324 | * requests in case all = '0'. | |
1325 | * Take care of the erp-chain (chained via cqr->refers) and remove either | |
1326 | * the whole erp-chain or none of the erp-requests. | |
1327 | * If a request is currently running, term_IO is called and the request | |
1328 | * is re-queued. Prior to removing the terminated request we need to wait | |
1329 | * for the clear-interrupt. | |
1330 | * In case termination is not possible we stop processing and just finishing | |
1331 | * the already moved requests. | |
1da177e4 | 1332 | */ |
8f61701b | 1333 | static int |
1da177e4 LT |
1334 | dasd_flush_ccw_queue(struct dasd_device * device, int all) |
1335 | { | |
8f61701b HH |
1336 | struct dasd_ccw_req *cqr, *orig, *n; |
1337 | int rc, i; | |
1338 | ||
1da177e4 | 1339 | struct list_head flush_queue; |
1da177e4 LT |
1340 | |
1341 | INIT_LIST_HEAD(&flush_queue); | |
1342 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b HH |
1343 | rc = 0; |
1344 | restart: | |
1345 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, list) { | |
1346 | /* get original request of erp request-chain */ | |
1347 | for (orig = cqr; orig->refers != NULL; orig = orig->refers); | |
1348 | ||
1da177e4 | 1349 | /* Flush all request or only block device requests? */ |
8f61701b HH |
1350 | if (all == 0 && cqr->callback != dasd_end_request_cb && |
1351 | orig->callback != dasd_end_request_cb) { | |
1da177e4 | 1352 | continue; |
8f61701b HH |
1353 | } |
1354 | /* Check status and move request to flush_queue */ | |
1355 | switch (cqr->status) { | |
1356 | case DASD_CQR_IN_IO: | |
1357 | rc = device->discipline->term_IO(cqr); | |
1358 | if (rc) { | |
1359 | /* unable to terminate requeust */ | |
1360 | DEV_MESSAGE(KERN_ERR, device, | |
1361 | "dasd flush ccw_queue is unable " | |
1362 | " to terminate request %p", | |
1363 | cqr); | |
1364 | /* stop flush processing */ | |
1365 | goto finished; | |
1366 | } | |
1367 | break; | |
1368 | case DASD_CQR_QUEUED: | |
1369 | case DASD_CQR_ERROR: | |
1370 | /* set request to FAILED */ | |
1da177e4 | 1371 | cqr->stopclk = get_clock(); |
8f61701b HH |
1372 | cqr->status = DASD_CQR_FAILED; |
1373 | break; | |
1374 | default: /* do not touch the others */ | |
1375 | break; | |
1376 | } | |
1377 | /* Rechain request (including erp chain) */ | |
1378 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) { | |
1379 | cqr->endclk = get_clock(); | |
1380 | list_move_tail(&cqr->list, &flush_queue); | |
1381 | } | |
1382 | if (i > 1) | |
1383 | /* moved more than one request - need to restart */ | |
1384 | goto restart; | |
1385 | } | |
1386 | ||
1387 | finished: | |
1388 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1389 | /* Now call the callback function of flushed requests */ | |
1390 | restart_cb: | |
1391 | list_for_each_entry_safe(cqr, n, &flush_queue, list) { | |
1392 | if (cqr->status == DASD_CQR_CLEAR) { | |
1393 | /* wait for clear interrupt! */ | |
1394 | wait_event(dasd_flush_wq, _wait_for_clear(cqr)); | |
1395 | cqr->status = DASD_CQR_FAILED; | |
1da177e4 LT |
1396 | } |
1397 | /* Process finished ERP request. */ | |
1398 | if (cqr->refers) { | |
1399 | __dasd_process_erp(device, cqr); | |
8f61701b HH |
1400 | /* restart list_for_xx loop since dasd_process_erp |
1401 | * might remove multiple elements */ | |
1402 | goto restart_cb; | |
1da177e4 | 1403 | } |
8f61701b | 1404 | /* call the callback function */ |
1da177e4 | 1405 | cqr->endclk = get_clock(); |
1da177e4 LT |
1406 | if (cqr->callback != NULL) |
1407 | (cqr->callback)(cqr, cqr->callback_data); | |
1408 | } | |
8f61701b | 1409 | return rc; |
1da177e4 LT |
1410 | } |
1411 | ||
1412 | /* | |
1413 | * Acquire the device lock and process queues for the device. | |
1414 | */ | |
1415 | static void | |
1416 | dasd_tasklet(struct dasd_device * device) | |
1417 | { | |
1418 | struct list_head final_queue; | |
1419 | struct list_head *l, *n; | |
1420 | struct dasd_ccw_req *cqr; | |
1421 | ||
1422 | atomic_set (&device->tasklet_scheduled, 0); | |
1423 | INIT_LIST_HEAD(&final_queue); | |
1424 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1425 | /* Check expire time of first request on the ccw queue. */ | |
1426 | __dasd_check_expire(device); | |
1427 | /* Finish off requests on ccw queue */ | |
1428 | __dasd_process_ccw_queue(device, &final_queue); | |
1429 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1430 | /* Now call the callback function of requests with final status */ | |
1431 | list_for_each_safe(l, n, &final_queue) { | |
1432 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
c2ba444d | 1433 | list_del_init(&cqr->list); |
1da177e4 LT |
1434 | if (cqr->callback != NULL) |
1435 | (cqr->callback)(cqr, cqr->callback_data); | |
1436 | } | |
1437 | spin_lock_irq(&device->request_queue_lock); | |
1438 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1439 | /* Get new request from the block device request queue */ | |
1440 | __dasd_process_blk_queue(device); | |
1441 | /* Now check if the head of the ccw queue needs to be started. */ | |
1442 | __dasd_start_head(device); | |
1443 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1444 | spin_unlock_irq(&device->request_queue_lock); | |
1445 | dasd_put_device(device); | |
1446 | } | |
1447 | ||
1448 | /* | |
1449 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1450 | */ | |
1451 | void | |
1452 | dasd_schedule_bh(struct dasd_device * device) | |
1453 | { | |
1454 | /* Protect against rescheduling. */ | |
973bd993 | 1455 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1456 | return; |
1457 | dasd_get_device(device); | |
1458 | tasklet_hi_schedule(&device->tasklet); | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Queue a request to the head of the ccw_queue. Start the I/O if | |
1463 | * possible. | |
1464 | */ | |
1465 | void | |
1466 | dasd_add_request_head(struct dasd_ccw_req *req) | |
1467 | { | |
1468 | struct dasd_device *device; | |
1469 | unsigned long flags; | |
1470 | ||
1471 | device = req->device; | |
1472 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1473 | req->status = DASD_CQR_QUEUED; | |
1474 | req->device = device; | |
1475 | list_add(&req->list, &device->ccw_queue); | |
1476 | /* let the bh start the request to keep them in order */ | |
1477 | dasd_schedule_bh(device); | |
1478 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1479 | } | |
1480 | ||
1481 | /* | |
1482 | * Queue a request to the tail of the ccw_queue. Start the I/O if | |
1483 | * possible. | |
1484 | */ | |
1485 | void | |
1486 | dasd_add_request_tail(struct dasd_ccw_req *req) | |
1487 | { | |
1488 | struct dasd_device *device; | |
1489 | unsigned long flags; | |
1490 | ||
1491 | device = req->device; | |
1492 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1493 | req->status = DASD_CQR_QUEUED; | |
1494 | req->device = device; | |
1495 | list_add_tail(&req->list, &device->ccw_queue); | |
1496 | /* let the bh start the request to keep them in order */ | |
1497 | dasd_schedule_bh(device); | |
1498 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1499 | } | |
1500 | ||
1501 | /* | |
1502 | * Wakeup callback. | |
1503 | */ | |
1504 | static void | |
1505 | dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) | |
1506 | { | |
1507 | wake_up((wait_queue_head_t *) data); | |
1508 | } | |
1509 | ||
1510 | static inline int | |
1511 | _wait_for_wakeup(struct dasd_ccw_req *cqr) | |
1512 | { | |
1513 | struct dasd_device *device; | |
1514 | int rc; | |
1515 | ||
1516 | device = cqr->device; | |
1517 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1518 | rc = ((cqr->status == DASD_CQR_DONE || |
1519 | cqr->status == DASD_CQR_FAILED) && | |
1520 | list_empty(&cqr->list)); | |
1da177e4 LT |
1521 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1522 | return rc; | |
1523 | } | |
1524 | ||
1525 | /* | |
1526 | * Attempts to start a special ccw queue and waits for its completion. | |
1527 | */ | |
1528 | int | |
1529 | dasd_sleep_on(struct dasd_ccw_req * cqr) | |
1530 | { | |
1531 | wait_queue_head_t wait_q; | |
1532 | struct dasd_device *device; | |
1533 | int rc; | |
138c014d | 1534 | |
1da177e4 LT |
1535 | device = cqr->device; |
1536 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
138c014d | 1537 | |
1da177e4 LT |
1538 | init_waitqueue_head (&wait_q); |
1539 | cqr->callback = dasd_wakeup_cb; | |
1540 | cqr->callback_data = (void *) &wait_q; | |
1541 | cqr->status = DASD_CQR_QUEUED; | |
1542 | list_add_tail(&cqr->list, &device->ccw_queue); | |
138c014d | 1543 | |
1da177e4 LT |
1544 | /* let the bh start the request to keep them in order */ |
1545 | dasd_schedule_bh(device); | |
138c014d | 1546 | |
1da177e4 LT |
1547 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1548 | ||
1549 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1550 | |
1da177e4 LT |
1551 | /* Request status is either done or failed. */ |
1552 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1553 | return rc; | |
1554 | } | |
1555 | ||
1556 | /* | |
1557 | * Attempts to start a special ccw queue and wait interruptible | |
1558 | * for its completion. | |
1559 | */ | |
1560 | int | |
1561 | dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) | |
1562 | { | |
1563 | wait_queue_head_t wait_q; | |
1564 | struct dasd_device *device; | |
1565 | int rc, finished; | |
1566 | ||
1567 | device = cqr->device; | |
1568 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1569 | ||
1570 | init_waitqueue_head (&wait_q); | |
1571 | cqr->callback = dasd_wakeup_cb; | |
1572 | cqr->callback_data = (void *) &wait_q; | |
1573 | cqr->status = DASD_CQR_QUEUED; | |
1574 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1575 | ||
1576 | /* let the bh start the request to keep them in order */ | |
1577 | dasd_schedule_bh(device); | |
1578 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1579 | ||
1580 | finished = 0; | |
1581 | while (!finished) { | |
1582 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); | |
1583 | if (rc != -ERESTARTSYS) { | |
c2ba444d HH |
1584 | /* Request is final (done or failed) */ |
1585 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1da177e4 LT |
1586 | break; |
1587 | } | |
1588 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1589 | switch (cqr->status) { |
1590 | case DASD_CQR_IN_IO: | |
1591 | /* terminate runnig cqr */ | |
1592 | if (device->discipline->term_IO) { | |
1593 | cqr->retries = -1; | |
1594 | device->discipline->term_IO(cqr); | |
8f61701b HH |
1595 | /* wait (non-interruptible) for final status |
1596 | * because signal ist still pending */ | |
c2ba444d HH |
1597 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1598 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1599 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1600 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1601 | finished = 1; | |
1602 | } | |
1603 | break; | |
1604 | case DASD_CQR_QUEUED: | |
1605 | /* request */ | |
1606 | list_del_init(&cqr->list); | |
1607 | rc = -EIO; | |
1da177e4 | 1608 | finished = 1; |
c2ba444d HH |
1609 | break; |
1610 | default: | |
1611 | /* cqr with 'non-interruptable' status - just wait */ | |
1612 | break; | |
1da177e4 LT |
1613 | } |
1614 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1615 | } | |
1616 | return rc; | |
1617 | } | |
1618 | ||
1619 | /* | |
1620 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1621 | * for eckd devices) the currently running request has to be terminated | |
1622 | * and be put back to status queued, before the special request is added | |
1623 | * to the head of the queue. Then the special request is waited on normally. | |
1624 | */ | |
1625 | static inline int | |
1626 | _dasd_term_running_cqr(struct dasd_device *device) | |
1627 | { | |
1628 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1629 | |
1630 | if (list_empty(&device->ccw_queue)) | |
1631 | return 0; | |
1632 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
8f61701b | 1633 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1634 | } |
1635 | ||
1636 | int | |
1637 | dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) | |
1638 | { | |
1639 | wait_queue_head_t wait_q; | |
1640 | struct dasd_device *device; | |
1641 | int rc; | |
138c014d | 1642 | |
1da177e4 LT |
1643 | device = cqr->device; |
1644 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1645 | rc = _dasd_term_running_cqr(device); | |
1646 | if (rc) { | |
1647 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1648 | return rc; | |
1649 | } | |
138c014d | 1650 | |
1da177e4 LT |
1651 | init_waitqueue_head (&wait_q); |
1652 | cqr->callback = dasd_wakeup_cb; | |
1653 | cqr->callback_data = (void *) &wait_q; | |
1654 | cqr->status = DASD_CQR_QUEUED; | |
1655 | list_add(&cqr->list, &device->ccw_queue); | |
138c014d | 1656 | |
1da177e4 LT |
1657 | /* let the bh start the request to keep them in order */ |
1658 | dasd_schedule_bh(device); | |
138c014d | 1659 | |
1da177e4 LT |
1660 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1661 | ||
1662 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1663 | |
1da177e4 LT |
1664 | /* Request status is either done or failed. */ |
1665 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1666 | return rc; | |
1667 | } | |
1668 | ||
1669 | /* | |
1670 | * Cancels a request that was started with dasd_sleep_on_req. | |
1671 | * This is useful to timeout requests. The request will be | |
1672 | * terminated if it is currently in i/o. | |
1673 | * Returns 1 if the request has been terminated. | |
1674 | */ | |
1675 | int | |
1676 | dasd_cancel_req(struct dasd_ccw_req *cqr) | |
1677 | { | |
1678 | struct dasd_device *device = cqr->device; | |
1679 | unsigned long flags; | |
1680 | int rc; | |
1681 | ||
1682 | rc = 0; | |
1683 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1684 | switch (cqr->status) { | |
1685 | case DASD_CQR_QUEUED: | |
1686 | /* request was not started - just set to failed */ | |
1687 | cqr->status = DASD_CQR_FAILED; | |
1688 | break; | |
1689 | case DASD_CQR_IN_IO: | |
1690 | /* request in IO - terminate IO and release again */ | |
1691 | if (device->discipline->term_IO(cqr) != 0) | |
1692 | /* what to do if unable to terminate ?????? | |
1693 | e.g. not _IN_IO */ | |
1694 | cqr->status = DASD_CQR_FAILED; | |
1695 | cqr->stopclk = get_clock(); | |
1696 | rc = 1; | |
1697 | break; | |
1698 | case DASD_CQR_DONE: | |
1699 | case DASD_CQR_FAILED: | |
1700 | /* already finished - do nothing */ | |
1701 | break; | |
1702 | default: | |
1703 | DEV_MESSAGE(KERN_ALERT, device, | |
1704 | "invalid status %02x in request", | |
1705 | cqr->status); | |
1706 | BUG(); | |
1707 | ||
1708 | } | |
1709 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1710 | dasd_schedule_bh(device); | |
1711 | return rc; | |
1712 | } | |
1713 | ||
1714 | /* | |
1715 | * SECTION: Block device operations (request queue, partitions, open, release). | |
1716 | */ | |
1717 | ||
1718 | /* | |
1719 | * Dasd request queue function. Called from ll_rw_blk.c | |
1720 | */ | |
1721 | static void | |
1722 | do_dasd_request(request_queue_t * queue) | |
1723 | { | |
1724 | struct dasd_device *device; | |
1725 | ||
1726 | device = (struct dasd_device *) queue->queuedata; | |
1727 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1728 | /* Get new request from the block device request queue */ | |
1729 | __dasd_process_blk_queue(device); | |
1730 | /* Now check if the head of the ccw queue needs to be started. */ | |
1731 | __dasd_start_head(device); | |
1732 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1733 | } | |
1734 | ||
1735 | /* | |
1736 | * Allocate and initialize request queue and default I/O scheduler. | |
1737 | */ | |
1738 | static int | |
1739 | dasd_alloc_queue(struct dasd_device * device) | |
1740 | { | |
1741 | int rc; | |
1742 | ||
1743 | device->request_queue = blk_init_queue(do_dasd_request, | |
1744 | &device->request_queue_lock); | |
1745 | if (device->request_queue == NULL) | |
1746 | return -ENOMEM; | |
1747 | ||
1748 | device->request_queue->queuedata = device; | |
1749 | ||
1750 | elevator_exit(device->request_queue->elevator); | |
1751 | rc = elevator_init(device->request_queue, "deadline"); | |
1752 | if (rc) { | |
1753 | blk_cleanup_queue(device->request_queue); | |
1754 | return rc; | |
1755 | } | |
1756 | return 0; | |
1757 | } | |
1758 | ||
1759 | /* | |
1760 | * Allocate and initialize request queue. | |
1761 | */ | |
1762 | static void | |
1763 | dasd_setup_queue(struct dasd_device * device) | |
1764 | { | |
1765 | int max; | |
1766 | ||
1767 | blk_queue_hardsect_size(device->request_queue, device->bp_block); | |
1768 | max = device->discipline->max_blocks << device->s2b_shift; | |
1769 | blk_queue_max_sectors(device->request_queue, max); | |
1770 | blk_queue_max_phys_segments(device->request_queue, -1L); | |
1771 | blk_queue_max_hw_segments(device->request_queue, -1L); | |
1772 | blk_queue_max_segment_size(device->request_queue, -1L); | |
1773 | blk_queue_segment_boundary(device->request_queue, -1L); | |
ed68cb36 | 1774 | blk_queue_ordered(device->request_queue, QUEUE_ORDERED_TAG, NULL); |
1da177e4 LT |
1775 | } |
1776 | ||
1777 | /* | |
1778 | * Deactivate and free request queue. | |
1779 | */ | |
1780 | static void | |
1781 | dasd_free_queue(struct dasd_device * device) | |
1782 | { | |
1783 | if (device->request_queue) { | |
1784 | blk_cleanup_queue(device->request_queue); | |
1785 | device->request_queue = NULL; | |
1786 | } | |
1787 | } | |
1788 | ||
1789 | /* | |
1790 | * Flush request on the request queue. | |
1791 | */ | |
1792 | static void | |
1793 | dasd_flush_request_queue(struct dasd_device * device) | |
1794 | { | |
1795 | struct request *req; | |
1796 | ||
1797 | if (!device->request_queue) | |
1798 | return; | |
138c014d | 1799 | |
1da177e4 | 1800 | spin_lock_irq(&device->request_queue_lock); |
8f61701b | 1801 | while ((req = elv_next_request(device->request_queue))) { |
1da177e4 | 1802 | blkdev_dequeue_request(req); |
ebc45999 | 1803 | dasd_end_request(req, 0); |
1da177e4 LT |
1804 | } |
1805 | spin_unlock_irq(&device->request_queue_lock); | |
1806 | } | |
1807 | ||
1808 | static int | |
1809 | dasd_open(struct inode *inp, struct file *filp) | |
1810 | { | |
1811 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1812 | struct dasd_device *device = disk->private_data; | |
1813 | int rc; | |
1814 | ||
1815 | atomic_inc(&device->open_count); | |
1816 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1817 | rc = -ENODEV; | |
1818 | goto unlock; | |
1819 | } | |
1820 | ||
1821 | if (!try_module_get(device->discipline->owner)) { | |
1822 | rc = -EINVAL; | |
1823 | goto unlock; | |
1824 | } | |
1825 | ||
1826 | if (dasd_probeonly) { | |
1827 | DEV_MESSAGE(KERN_INFO, device, "%s", | |
1828 | "No access to device due to probeonly mode"); | |
1829 | rc = -EPERM; | |
1830 | goto out; | |
1831 | } | |
1832 | ||
90f0094d | 1833 | if (device->state <= DASD_STATE_BASIC) { |
1da177e4 LT |
1834 | DBF_DEV_EVENT(DBF_ERR, device, " %s", |
1835 | " Cannot open unrecognized device"); | |
1836 | rc = -ENODEV; | |
1837 | goto out; | |
1838 | } | |
1839 | ||
1840 | return 0; | |
1841 | ||
1842 | out: | |
1843 | module_put(device->discipline->owner); | |
1844 | unlock: | |
1845 | atomic_dec(&device->open_count); | |
1846 | return rc; | |
1847 | } | |
1848 | ||
1849 | static int | |
1850 | dasd_release(struct inode *inp, struct file *filp) | |
1851 | { | |
1852 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1853 | struct dasd_device *device = disk->private_data; | |
1854 | ||
1855 | atomic_dec(&device->open_count); | |
1856 | module_put(device->discipline->owner); | |
1857 | return 0; | |
1858 | } | |
1859 | ||
a885c8c4 CH |
1860 | /* |
1861 | * Return disk geometry. | |
1862 | */ | |
1863 | static int | |
1864 | dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1865 | { | |
1866 | struct dasd_device *device; | |
1867 | ||
1868 | device = bdev->bd_disk->private_data; | |
1869 | if (!device) | |
1870 | return -ENODEV; | |
1871 | ||
1872 | if (!device->discipline || | |
1873 | !device->discipline->fill_geometry) | |
1874 | return -EINVAL; | |
1875 | ||
1876 | device->discipline->fill_geometry(device, geo); | |
1877 | geo->start = get_start_sect(bdev) >> device->s2b_shift; | |
1878 | return 0; | |
1879 | } | |
1880 | ||
1da177e4 LT |
1881 | struct block_device_operations |
1882 | dasd_device_operations = { | |
1883 | .owner = THIS_MODULE, | |
1884 | .open = dasd_open, | |
1885 | .release = dasd_release, | |
1886 | .ioctl = dasd_ioctl, | |
8262037f | 1887 | .compat_ioctl = dasd_compat_ioctl, |
a885c8c4 | 1888 | .getgeo = dasd_getgeo, |
1da177e4 LT |
1889 | }; |
1890 | ||
1891 | ||
1892 | static void | |
1893 | dasd_exit(void) | |
1894 | { | |
1895 | #ifdef CONFIG_PROC_FS | |
1896 | dasd_proc_exit(); | |
1897 | #endif | |
20c64468 | 1898 | dasd_eer_exit(); |
6bb0e010 HH |
1899 | if (dasd_page_cache != NULL) { |
1900 | kmem_cache_destroy(dasd_page_cache); | |
1901 | dasd_page_cache = NULL; | |
1902 | } | |
1da177e4 LT |
1903 | dasd_gendisk_exit(); |
1904 | dasd_devmap_exit(); | |
1da177e4 LT |
1905 | if (dasd_debug_area != NULL) { |
1906 | debug_unregister(dasd_debug_area); | |
1907 | dasd_debug_area = NULL; | |
1908 | } | |
1909 | } | |
1910 | ||
1911 | /* | |
1912 | * SECTION: common functions for ccw_driver use | |
1913 | */ | |
1914 | ||
1c01b8a5 HH |
1915 | /* |
1916 | * Initial attempt at a probe function. this can be simplified once | |
1917 | * the other detection code is gone. | |
1918 | */ | |
1da177e4 LT |
1919 | int |
1920 | dasd_generic_probe (struct ccw_device *cdev, | |
1921 | struct dasd_discipline *discipline) | |
1922 | { | |
1923 | int ret; | |
1924 | ||
40545573 HH |
1925 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
1926 | if (ret) { | |
1927 | printk(KERN_WARNING | |
1928 | "dasd_generic_probe: could not set ccw-device options " | |
1929 | "for %s\n", cdev->dev.bus_id); | |
1930 | return ret; | |
1931 | } | |
1da177e4 LT |
1932 | ret = dasd_add_sysfs_files(cdev); |
1933 | if (ret) { | |
1934 | printk(KERN_WARNING | |
1935 | "dasd_generic_probe: could not add sysfs entries " | |
1936 | "for %s\n", cdev->dev.bus_id); | |
40545573 | 1937 | return ret; |
1da177e4 | 1938 | } |
40545573 | 1939 | cdev->handler = &dasd_int_handler; |
1da177e4 | 1940 | |
40545573 HH |
1941 | /* |
1942 | * Automatically online either all dasd devices (dasd_autodetect) | |
1943 | * or all devices specified with dasd= parameters during | |
1944 | * initial probe. | |
1945 | */ | |
1946 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
1947 | (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0)) | |
1948 | ret = ccw_device_set_online(cdev); | |
1949 | if (ret) | |
1950 | printk(KERN_WARNING | |
1951 | "dasd_generic_probe: could not initially online " | |
1952 | "ccw-device %s\n", cdev->dev.bus_id); | |
1da177e4 LT |
1953 | return ret; |
1954 | } | |
1955 | ||
1c01b8a5 HH |
1956 | /* |
1957 | * This will one day be called from a global not_oper handler. | |
1958 | * It is also used by driver_unregister during module unload. | |
1959 | */ | |
1da177e4 LT |
1960 | void |
1961 | dasd_generic_remove (struct ccw_device *cdev) | |
1962 | { | |
1963 | struct dasd_device *device; | |
1964 | ||
59afda78 HH |
1965 | cdev->handler = NULL; |
1966 | ||
1da177e4 LT |
1967 | dasd_remove_sysfs_files(cdev); |
1968 | device = dasd_device_from_cdev(cdev); | |
1969 | if (IS_ERR(device)) | |
1970 | return; | |
1971 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1972 | /* Already doing offline processing */ | |
1973 | dasd_put_device(device); | |
1974 | return; | |
1975 | } | |
1976 | /* | |
1977 | * This device is removed unconditionally. Set offline | |
1978 | * flag to prevent dasd_open from opening it while it is | |
1979 | * no quite down yet. | |
1980 | */ | |
1981 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1982 | /* dasd_delete_device destroys the device reference. */ | |
1983 | dasd_delete_device(device); | |
1984 | } | |
1985 | ||
1c01b8a5 HH |
1986 | /* |
1987 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 1988 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
1989 | * or the user has started activation through sysfs. |
1990 | */ | |
1da177e4 LT |
1991 | int |
1992 | dasd_generic_set_online (struct ccw_device *cdev, | |
aa88861f | 1993 | struct dasd_discipline *base_discipline) |
1da177e4 LT |
1994 | |
1995 | { | |
aa88861f | 1996 | struct dasd_discipline *discipline; |
1da177e4 | 1997 | struct dasd_device *device; |
c6eb7b77 | 1998 | int rc; |
f24acd45 | 1999 | |
40545573 HH |
2000 | /* first online clears initial online feature flag */ |
2001 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2002 | device = dasd_create_device(cdev); |
2003 | if (IS_ERR(device)) | |
2004 | return PTR_ERR(device); | |
2005 | ||
aa88861f | 2006 | discipline = base_discipline; |
c6eb7b77 | 2007 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
2008 | if (!dasd_diag_discipline_pointer) { |
2009 | printk (KERN_WARNING | |
2010 | "dasd_generic couldn't online device %s " | |
2011 | "- discipline DIAG not available\n", | |
2012 | cdev->dev.bus_id); | |
2013 | dasd_delete_device(device); | |
2014 | return -ENODEV; | |
2015 | } | |
2016 | discipline = dasd_diag_discipline_pointer; | |
2017 | } | |
aa88861f PO |
2018 | if (!try_module_get(base_discipline->owner)) { |
2019 | dasd_delete_device(device); | |
2020 | return -EINVAL; | |
2021 | } | |
2022 | if (!try_module_get(discipline->owner)) { | |
2023 | module_put(base_discipline->owner); | |
2024 | dasd_delete_device(device); | |
2025 | return -EINVAL; | |
2026 | } | |
2027 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2028 | device->discipline = discipline; |
2029 | ||
2030 | rc = discipline->check_device(device); | |
2031 | if (rc) { | |
2032 | printk (KERN_WARNING | |
2033 | "dasd_generic couldn't online device %s " | |
2034 | "with discipline %s rc=%i\n", | |
2035 | cdev->dev.bus_id, discipline->name, rc); | |
aa88861f PO |
2036 | module_put(discipline->owner); |
2037 | module_put(base_discipline->owner); | |
1da177e4 LT |
2038 | dasd_delete_device(device); |
2039 | return rc; | |
2040 | } | |
2041 | ||
2042 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2043 | if (device->state <= DASD_STATE_KNOWN) { | |
2044 | printk (KERN_WARNING | |
2045 | "dasd_generic discipline not found for %s\n", | |
2046 | cdev->dev.bus_id); | |
2047 | rc = -ENODEV; | |
2048 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2049 | dasd_delete_device(device); | |
2050 | } else | |
2051 | pr_debug("dasd_generic device %s found\n", | |
2052 | cdev->dev.bus_id); | |
2053 | ||
2054 | /* FIXME: we have to wait for the root device but we don't want | |
2055 | * to wait for each single device but for all at once. */ | |
2056 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2057 | ||
2058 | dasd_put_device(device); | |
2059 | ||
2060 | return rc; | |
2061 | } | |
2062 | ||
2063 | int | |
2064 | dasd_generic_set_offline (struct ccw_device *cdev) | |
2065 | { | |
2066 | struct dasd_device *device; | |
dafd87aa | 2067 | int max_count, open_count; |
1da177e4 LT |
2068 | |
2069 | device = dasd_device_from_cdev(cdev); | |
2070 | if (IS_ERR(device)) | |
2071 | return PTR_ERR(device); | |
2072 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2073 | /* Already doing offline processing */ | |
2074 | dasd_put_device(device); | |
2075 | return 0; | |
2076 | } | |
2077 | /* | |
2078 | * We must make sure that this device is currently not in use. | |
2079 | * The open_count is increased for every opener, that includes | |
2080 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2081 | * in the other openers. | |
2082 | */ | |
2083 | max_count = device->bdev ? 0 : -1; | |
dafd87aa HH |
2084 | open_count = (int) atomic_read(&device->open_count); |
2085 | if (open_count > max_count) { | |
2086 | if (open_count > 0) | |
2087 | printk (KERN_WARNING "Can't offline dasd device with " | |
2088 | "open count = %i.\n", | |
2089 | open_count); | |
2090 | else | |
2091 | printk (KERN_WARNING "%s", | |
2092 | "Can't offline dasd device due to internal " | |
2093 | "use\n"); | |
1da177e4 LT |
2094 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2095 | dasd_put_device(device); | |
2096 | return -EBUSY; | |
2097 | } | |
2098 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2099 | /* dasd_delete_device destroys the device reference. */ | |
2100 | dasd_delete_device(device); | |
2101 | ||
2102 | return 0; | |
2103 | } | |
2104 | ||
2105 | int | |
2106 | dasd_generic_notify(struct ccw_device *cdev, int event) | |
2107 | { | |
2108 | struct dasd_device *device; | |
2109 | struct dasd_ccw_req *cqr; | |
2110 | unsigned long flags; | |
2111 | int ret; | |
2112 | ||
2113 | device = dasd_device_from_cdev(cdev); | |
2114 | if (IS_ERR(device)) | |
2115 | return 0; | |
2116 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
2117 | ret = 0; | |
2118 | switch (event) { | |
2119 | case CIO_GONE: | |
2120 | case CIO_NO_PATH: | |
20c64468 SW |
2121 | /* First of all call extended error reporting. */ |
2122 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2123 | ||
1da177e4 LT |
2124 | if (device->state < DASD_STATE_BASIC) |
2125 | break; | |
2126 | /* Device is active. We want to keep it. */ | |
2127 | if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) { | |
2128 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2129 | if (cqr->status == DASD_CQR_IN_IO) | |
2130 | cqr->status = DASD_CQR_FAILED; | |
2131 | device->stopped |= DASD_STOPPED_DC_EIO; | |
1da177e4 LT |
2132 | } else { |
2133 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2134 | if (cqr->status == DASD_CQR_IN_IO) { | |
2135 | cqr->status = DASD_CQR_QUEUED; | |
2136 | cqr->retries++; | |
2137 | } | |
2138 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2139 | dasd_set_timer(device, 0); | |
2140 | } | |
1c01b8a5 | 2141 | dasd_schedule_bh(device); |
1da177e4 LT |
2142 | ret = 1; |
2143 | break; | |
2144 | case CIO_OPER: | |
2145 | /* FIXME: add a sanity check. */ | |
2146 | device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO); | |
2147 | dasd_schedule_bh(device); | |
2148 | ret = 1; | |
2149 | break; | |
2150 | } | |
2151 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
2152 | dasd_put_device(device); | |
2153 | return ret; | |
2154 | } | |
2155 | ||
20c64468 | 2156 | |
1da177e4 LT |
2157 | static int __init |
2158 | dasd_init(void) | |
2159 | { | |
2160 | int rc; | |
2161 | ||
2162 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2163 | init_waitqueue_head(&dasd_flush_wq); |
1da177e4 LT |
2164 | |
2165 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
66a464db | 2166 | dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long)); |
1da177e4 LT |
2167 | if (dasd_debug_area == NULL) { |
2168 | rc = -ENOMEM; | |
2169 | goto failed; | |
2170 | } | |
2171 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
2172 | debug_set_level(dasd_debug_area, DBF_EMERG); | |
2173 | ||
2174 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2175 | ||
2176 | dasd_diag_discipline_pointer = NULL; | |
2177 | ||
1da177e4 LT |
2178 | rc = dasd_devmap_init(); |
2179 | if (rc) | |
2180 | goto failed; | |
2181 | rc = dasd_gendisk_init(); | |
2182 | if (rc) | |
2183 | goto failed; | |
2184 | rc = dasd_parse(); | |
2185 | if (rc) | |
2186 | goto failed; | |
20c64468 SW |
2187 | rc = dasd_eer_init(); |
2188 | if (rc) | |
2189 | goto failed; | |
1da177e4 LT |
2190 | #ifdef CONFIG_PROC_FS |
2191 | rc = dasd_proc_init(); | |
2192 | if (rc) | |
2193 | goto failed; | |
2194 | #endif | |
2195 | ||
2196 | return 0; | |
2197 | failed: | |
2198 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2199 | dasd_exit(); | |
2200 | return rc; | |
2201 | } | |
2202 | ||
2203 | module_init(dasd_init); | |
2204 | module_exit(dasd_exit); | |
2205 | ||
2206 | EXPORT_SYMBOL(dasd_debug_area); | |
2207 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2208 | ||
2209 | EXPORT_SYMBOL(dasd_add_request_head); | |
2210 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2211 | EXPORT_SYMBOL(dasd_cancel_req); | |
2212 | EXPORT_SYMBOL(dasd_clear_timer); | |
2213 | EXPORT_SYMBOL(dasd_enable_device); | |
2214 | EXPORT_SYMBOL(dasd_int_handler); | |
2215 | EXPORT_SYMBOL(dasd_kfree_request); | |
2216 | EXPORT_SYMBOL(dasd_kick_device); | |
2217 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
2218 | EXPORT_SYMBOL(dasd_schedule_bh); | |
2219 | EXPORT_SYMBOL(dasd_set_target_state); | |
2220 | EXPORT_SYMBOL(dasd_set_timer); | |
2221 | EXPORT_SYMBOL(dasd_sfree_request); | |
2222 | EXPORT_SYMBOL(dasd_sleep_on); | |
2223 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2224 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2225 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2226 | EXPORT_SYMBOL(dasd_start_IO); | |
2227 | EXPORT_SYMBOL(dasd_term_IO); | |
2228 | ||
2229 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2230 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2231 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2232 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2233 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
1da177e4 | 2234 |