Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
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); | |
b0035f12 | 187 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
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; | |
867dcd0f | 206 | dasd_clear_timer(device); |
8f61701b | 207 | |
1da177e4 LT |
208 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
209 | if (device->debug_area != NULL) { | |
210 | debug_unregister(device->debug_area); | |
211 | device->debug_area = NULL; | |
212 | } | |
213 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 214 | return 0; |
1da177e4 LT |
215 | } |
216 | ||
217 | /* | |
218 | * Do the initial analysis. The do_analysis function may return | |
219 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
220 | * until the discipline decides to continue the startup sequence | |
221 | * by calling the function dasd_change_state. The eckd disciplines | |
222 | * uses this to start a ccw that detects the format. The completion | |
223 | * interrupt for this detection ccw uses the kernel event daemon to | |
224 | * trigger the call to dasd_change_state. All this is done in the | |
225 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
226 | * After the analysis ccw is done (do_analysis returned 0) the block |
227 | * device is setup. | |
228 | * In case the analysis returns an error, the device setup is stopped | |
229 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 230 | */ |
8f61701b | 231 | static int |
1da177e4 LT |
232 | dasd_state_basic_to_ready(struct dasd_device * device) |
233 | { | |
234 | int rc; | |
235 | ||
236 | rc = 0; | |
237 | if (device->discipline->do_analysis != NULL) | |
238 | rc = device->discipline->do_analysis(device); | |
90f0094d HH |
239 | if (rc) { |
240 | if (rc != -EAGAIN) | |
241 | device->state = DASD_STATE_UNFMT; | |
1da177e4 | 242 | return rc; |
90f0094d HH |
243 | } |
244 | /* make disk known with correct capacity */ | |
1da177e4 | 245 | dasd_setup_queue(device); |
90f0094d | 246 | set_capacity(device->gdp, device->blocks << device->s2b_shift); |
1da177e4 | 247 | device->state = DASD_STATE_READY; |
90f0094d HH |
248 | rc = dasd_scan_partitions(device); |
249 | if (rc) | |
1da177e4 | 250 | device->state = DASD_STATE_BASIC; |
90f0094d | 251 | return rc; |
1da177e4 LT |
252 | } |
253 | ||
254 | /* | |
255 | * Remove device from block device layer. Destroy dirty buffers. | |
256 | * Forget format information. Check if the target level is basic | |
257 | * and if it is create fake disk for formatting. | |
258 | */ | |
8f61701b | 259 | static int |
1da177e4 LT |
260 | dasd_state_ready_to_basic(struct dasd_device * device) |
261 | { | |
8f61701b HH |
262 | int rc; |
263 | ||
264 | rc = dasd_flush_ccw_queue(device, 0); | |
265 | if (rc) | |
266 | return rc; | |
1da177e4 LT |
267 | dasd_destroy_partitions(device); |
268 | dasd_flush_request_queue(device); | |
269 | device->blocks = 0; | |
270 | device->bp_block = 0; | |
271 | device->s2b_shift = 0; | |
272 | device->state = DASD_STATE_BASIC; | |
8f61701b | 273 | return 0; |
1da177e4 LT |
274 | } |
275 | ||
90f0094d HH |
276 | /* |
277 | * Back to basic. | |
278 | */ | |
8f61701b | 279 | static int |
90f0094d HH |
280 | dasd_state_unfmt_to_basic(struct dasd_device * device) |
281 | { | |
282 | device->state = DASD_STATE_BASIC; | |
8f61701b | 283 | return 0; |
90f0094d HH |
284 | } |
285 | ||
1da177e4 LT |
286 | /* |
287 | * Make the device online and schedule the bottom half to start | |
288 | * the requeueing of requests from the linux request queue to the | |
289 | * ccw queue. | |
290 | */ | |
8f61701b | 291 | static int |
1da177e4 LT |
292 | dasd_state_ready_to_online(struct dasd_device * device) |
293 | { | |
294 | device->state = DASD_STATE_ONLINE; | |
295 | dasd_schedule_bh(device); | |
296 | return 0; | |
297 | } | |
298 | ||
299 | /* | |
300 | * Stop the requeueing of requests again. | |
301 | */ | |
8f61701b | 302 | static int |
1da177e4 LT |
303 | dasd_state_online_to_ready(struct dasd_device * device) |
304 | { | |
305 | device->state = DASD_STATE_READY; | |
8f61701b | 306 | return 0; |
1da177e4 LT |
307 | } |
308 | ||
309 | /* | |
310 | * Device startup state changes. | |
311 | */ | |
8f61701b | 312 | static int |
1da177e4 LT |
313 | dasd_increase_state(struct dasd_device *device) |
314 | { | |
315 | int rc; | |
316 | ||
317 | rc = 0; | |
318 | if (device->state == DASD_STATE_NEW && | |
319 | device->target >= DASD_STATE_KNOWN) | |
320 | rc = dasd_state_new_to_known(device); | |
321 | ||
322 | if (!rc && | |
323 | device->state == DASD_STATE_KNOWN && | |
324 | device->target >= DASD_STATE_BASIC) | |
325 | rc = dasd_state_known_to_basic(device); | |
326 | ||
327 | if (!rc && | |
328 | device->state == DASD_STATE_BASIC && | |
329 | device->target >= DASD_STATE_READY) | |
330 | rc = dasd_state_basic_to_ready(device); | |
331 | ||
39ccf95e HH |
332 | if (!rc && |
333 | device->state == DASD_STATE_UNFMT && | |
334 | device->target > DASD_STATE_UNFMT) | |
335 | rc = -EPERM; | |
336 | ||
1da177e4 LT |
337 | if (!rc && |
338 | device->state == DASD_STATE_READY && | |
339 | device->target >= DASD_STATE_ONLINE) | |
340 | rc = dasd_state_ready_to_online(device); | |
341 | ||
342 | return rc; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Device shutdown state changes. | |
347 | */ | |
8f61701b | 348 | static int |
1da177e4 LT |
349 | dasd_decrease_state(struct dasd_device *device) |
350 | { | |
8f61701b HH |
351 | int rc; |
352 | ||
353 | rc = 0; | |
1da177e4 LT |
354 | if (device->state == DASD_STATE_ONLINE && |
355 | device->target <= DASD_STATE_READY) | |
8f61701b | 356 | rc = dasd_state_online_to_ready(device); |
138c014d | 357 | |
8f61701b HH |
358 | if (!rc && |
359 | device->state == DASD_STATE_READY && | |
1da177e4 | 360 | device->target <= DASD_STATE_BASIC) |
8f61701b | 361 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 362 | |
8f61701b HH |
363 | if (!rc && |
364 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 365 | device->target <= DASD_STATE_BASIC) |
8f61701b | 366 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 367 | |
8f61701b HH |
368 | if (!rc && |
369 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 370 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 371 | rc = dasd_state_basic_to_known(device); |
138c014d | 372 | |
8f61701b HH |
373 | if (!rc && |
374 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 375 | device->target <= DASD_STATE_NEW) |
8f61701b | 376 | rc = dasd_state_known_to_new(device); |
1da177e4 | 377 | |
8f61701b | 378 | return rc; |
1da177e4 LT |
379 | } |
380 | ||
381 | /* | |
382 | * This is the main startup/shutdown routine. | |
383 | */ | |
384 | static void | |
385 | dasd_change_state(struct dasd_device *device) | |
386 | { | |
387 | int rc; | |
388 | ||
389 | if (device->state == device->target) | |
390 | /* Already where we want to go today... */ | |
391 | return; | |
392 | if (device->state < device->target) | |
393 | rc = dasd_increase_state(device); | |
394 | else | |
395 | rc = dasd_decrease_state(device); | |
396 | if (rc && rc != -EAGAIN) | |
397 | device->target = device->state; | |
398 | ||
399 | if (device->state == device->target) | |
400 | wake_up(&dasd_init_waitq); | |
401 | } | |
402 | ||
403 | /* | |
404 | * Kick starter for devices that did not complete the startup/shutdown | |
405 | * procedure or were sleeping because of a pending state. | |
406 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
407 | * event daemon. | |
408 | */ | |
409 | static void | |
410 | do_kick_device(void *data) | |
411 | { | |
412 | struct dasd_device *device; | |
413 | ||
414 | device = (struct dasd_device *) data; | |
415 | dasd_change_state(device); | |
416 | dasd_schedule_bh(device); | |
417 | dasd_put_device(device); | |
418 | } | |
419 | ||
420 | void | |
421 | dasd_kick_device(struct dasd_device *device) | |
422 | { | |
423 | dasd_get_device(device); | |
424 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
425 | schedule_work(&device->kick_work); | |
426 | } | |
427 | ||
428 | /* | |
429 | * Set the target state for a device and starts the state change. | |
430 | */ | |
431 | void | |
432 | dasd_set_target_state(struct dasd_device *device, int target) | |
433 | { | |
434 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
435 | if (dasd_probeonly && target > DASD_STATE_READY) | |
436 | target = DASD_STATE_READY; | |
437 | if (device->target != target) { | |
438 | if (device->state == target) | |
439 | wake_up(&dasd_init_waitq); | |
440 | device->target = target; | |
441 | } | |
442 | if (device->state != device->target) | |
443 | dasd_change_state(device); | |
444 | } | |
445 | ||
446 | /* | |
447 | * Enable devices with device numbers in [from..to]. | |
448 | */ | |
449 | static inline int | |
450 | _wait_for_device(struct dasd_device *device) | |
451 | { | |
452 | return (device->state == device->target); | |
453 | } | |
454 | ||
455 | void | |
456 | dasd_enable_device(struct dasd_device *device) | |
457 | { | |
458 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
459 | if (device->state <= DASD_STATE_KNOWN) | |
460 | /* No discipline for device found. */ | |
461 | dasd_set_target_state(device, DASD_STATE_NEW); | |
462 | /* Now wait for the devices to come up. */ | |
463 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
464 | } | |
465 | ||
466 | /* | |
467 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
468 | */ | |
469 | #ifdef CONFIG_DASD_PROFILE | |
470 | ||
471 | struct dasd_profile_info_t dasd_global_profile; | |
472 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
473 | ||
474 | /* | |
475 | * Increments counter in global and local profiling structures. | |
476 | */ | |
477 | #define dasd_profile_counter(value, counter, device) \ | |
478 | { \ | |
479 | int index; \ | |
480 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
481 | dasd_global_profile.counter[index]++; \ | |
482 | device->profile.counter[index]++; \ | |
483 | } | |
484 | ||
485 | /* | |
486 | * Add profiling information for cqr before execution. | |
487 | */ | |
488 | static inline void | |
489 | dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
490 | struct request *req) | |
491 | { | |
492 | struct list_head *l; | |
493 | unsigned int counter; | |
494 | ||
495 | if (dasd_profile_level != DASD_PROFILE_ON) | |
496 | return; | |
497 | ||
498 | /* count the length of the chanq for statistics */ | |
499 | counter = 0; | |
500 | list_for_each(l, &device->ccw_queue) | |
501 | if (++counter >= 31) | |
502 | break; | |
503 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
504 | device->profile.dasd_io_nr_req[counter]++; | |
505 | } | |
506 | ||
507 | /* | |
508 | * Add profiling information for cqr after execution. | |
509 | */ | |
510 | static inline void | |
511 | dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
512 | struct request *req) | |
513 | { | |
514 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
515 | long tottimeps, sectors; | |
516 | ||
517 | if (dasd_profile_level != DASD_PROFILE_ON) | |
518 | return; | |
519 | ||
520 | sectors = req->nr_sectors; | |
521 | if (!cqr->buildclk || !cqr->startclk || | |
522 | !cqr->stopclk || !cqr->endclk || | |
523 | !sectors) | |
524 | return; | |
525 | ||
526 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
527 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
528 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
529 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
530 | tottimeps = tottime / sectors; | |
531 | ||
532 | if (!dasd_global_profile.dasd_io_reqs) | |
533 | memset(&dasd_global_profile, 0, | |
534 | sizeof (struct dasd_profile_info_t)); | |
535 | dasd_global_profile.dasd_io_reqs++; | |
536 | dasd_global_profile.dasd_io_sects += sectors; | |
537 | ||
538 | if (!device->profile.dasd_io_reqs) | |
539 | memset(&device->profile, 0, | |
540 | sizeof (struct dasd_profile_info_t)); | |
541 | device->profile.dasd_io_reqs++; | |
542 | device->profile.dasd_io_sects += sectors; | |
543 | ||
544 | dasd_profile_counter(sectors, dasd_io_secs, device); | |
545 | dasd_profile_counter(tottime, dasd_io_times, device); | |
546 | dasd_profile_counter(tottimeps, dasd_io_timps, device); | |
547 | dasd_profile_counter(strtime, dasd_io_time1, device); | |
548 | dasd_profile_counter(irqtime, dasd_io_time2, device); | |
549 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device); | |
550 | dasd_profile_counter(endtime, dasd_io_time3, device); | |
551 | } | |
552 | #else | |
553 | #define dasd_profile_start(device, cqr, req) do {} while (0) | |
554 | #define dasd_profile_end(device, cqr, req) do {} while (0) | |
555 | #endif /* CONFIG_DASD_PROFILE */ | |
556 | ||
557 | /* | |
558 | * Allocate memory for a channel program with 'cplength' channel | |
559 | * command words and 'datasize' additional space. There are two | |
560 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
561 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
562 | * that gets allocated for each device. | |
563 | */ | |
564 | struct dasd_ccw_req * | |
565 | dasd_kmalloc_request(char *magic, int cplength, int datasize, | |
566 | struct dasd_device * device) | |
567 | { | |
568 | struct dasd_ccw_req *cqr; | |
569 | ||
570 | /* Sanity checks */ | |
7ac1e877 ES |
571 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
572 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 573 | |
88abaab4 | 574 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
575 | if (cqr == NULL) |
576 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
577 | cqr->cpaddr = NULL; |
578 | if (cplength > 0) { | |
88abaab4 | 579 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
580 | GFP_ATOMIC | GFP_DMA); |
581 | if (cqr->cpaddr == NULL) { | |
582 | kfree(cqr); | |
583 | return ERR_PTR(-ENOMEM); | |
584 | } | |
1da177e4 LT |
585 | } |
586 | cqr->data = NULL; | |
587 | if (datasize > 0) { | |
88abaab4 | 588 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 589 | if (cqr->data == NULL) { |
17fd682e | 590 | kfree(cqr->cpaddr); |
1da177e4 LT |
591 | kfree(cqr); |
592 | return ERR_PTR(-ENOMEM); | |
593 | } | |
1da177e4 LT |
594 | } |
595 | strncpy((char *) &cqr->magic, magic, 4); | |
596 | ASCEBC((char *) &cqr->magic, 4); | |
597 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
598 | dasd_get_device(device); | |
599 | return cqr; | |
600 | } | |
601 | ||
602 | struct dasd_ccw_req * | |
603 | dasd_smalloc_request(char *magic, int cplength, int datasize, | |
604 | struct dasd_device * device) | |
605 | { | |
606 | unsigned long flags; | |
607 | struct dasd_ccw_req *cqr; | |
608 | char *data; | |
609 | int size; | |
610 | ||
611 | /* Sanity checks */ | |
7ac1e877 ES |
612 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
613 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
614 | |
615 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
616 | if (cplength > 0) | |
617 | size += cplength * sizeof(struct ccw1); | |
618 | if (datasize > 0) | |
619 | size += datasize; | |
620 | spin_lock_irqsave(&device->mem_lock, flags); | |
621 | cqr = (struct dasd_ccw_req *) | |
622 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
623 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
624 | if (cqr == NULL) | |
625 | return ERR_PTR(-ENOMEM); | |
626 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
627 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
628 | cqr->cpaddr = NULL; | |
629 | if (cplength > 0) { | |
630 | cqr->cpaddr = (struct ccw1 *) data; | |
631 | data += cplength*sizeof(struct ccw1); | |
632 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
633 | } | |
634 | cqr->data = NULL; | |
635 | if (datasize > 0) { | |
636 | cqr->data = data; | |
637 | memset(cqr->data, 0, datasize); | |
638 | } | |
639 | strncpy((char *) &cqr->magic, magic, 4); | |
640 | ASCEBC((char *) &cqr->magic, 4); | |
641 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
642 | dasd_get_device(device); | |
643 | return cqr; | |
644 | } | |
645 | ||
646 | /* | |
647 | * Free memory of a channel program. This function needs to free all the | |
648 | * idal lists that might have been created by dasd_set_cda and the | |
649 | * struct dasd_ccw_req itself. | |
650 | */ | |
651 | void | |
652 | dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
653 | { | |
347a8dc3 | 654 | #ifdef CONFIG_64BIT |
1da177e4 LT |
655 | struct ccw1 *ccw; |
656 | ||
657 | /* Clear any idals used for the request. */ | |
658 | ccw = cqr->cpaddr; | |
659 | do { | |
660 | clear_normalized_cda(ccw); | |
661 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
662 | #endif | |
17fd682e JJ |
663 | kfree(cqr->cpaddr); |
664 | kfree(cqr->data); | |
1da177e4 LT |
665 | kfree(cqr); |
666 | dasd_put_device(device); | |
667 | } | |
668 | ||
669 | void | |
670 | dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
671 | { | |
672 | unsigned long flags; | |
673 | ||
674 | spin_lock_irqsave(&device->mem_lock, flags); | |
675 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
676 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
677 | dasd_put_device(device); | |
678 | } | |
679 | ||
680 | /* | |
681 | * Check discipline magic in cqr. | |
682 | */ | |
683 | static inline int | |
684 | dasd_check_cqr(struct dasd_ccw_req *cqr) | |
685 | { | |
686 | struct dasd_device *device; | |
687 | ||
688 | if (cqr == NULL) | |
689 | return -EINVAL; | |
690 | device = cqr->device; | |
691 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { | |
692 | DEV_MESSAGE(KERN_WARNING, device, | |
693 | " dasd_ccw_req 0x%08x magic doesn't match" | |
694 | " discipline 0x%08x", | |
695 | cqr->magic, | |
696 | *(unsigned int *) device->discipline->name); | |
697 | return -EINVAL; | |
698 | } | |
699 | return 0; | |
700 | } | |
701 | ||
702 | /* | |
703 | * Terminate the current i/o and set the request to clear_pending. | |
704 | * Timer keeps device runnig. | |
705 | * ccw_device_clear can fail if the i/o subsystem | |
706 | * is in a bad mood. | |
707 | */ | |
708 | int | |
709 | dasd_term_IO(struct dasd_ccw_req * cqr) | |
710 | { | |
711 | struct dasd_device *device; | |
712 | int retries, rc; | |
713 | ||
714 | /* Check the cqr */ | |
715 | rc = dasd_check_cqr(cqr); | |
716 | if (rc) | |
717 | return rc; | |
718 | retries = 0; | |
719 | device = (struct dasd_device *) cqr->device; | |
720 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { | |
721 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
722 | switch (rc) { | |
723 | case 0: /* termination successful */ | |
c2ba444d HH |
724 | cqr->retries--; |
725 | cqr->status = DASD_CQR_CLEAR; | |
1da177e4 | 726 | cqr->stopclk = get_clock(); |
8f61701b | 727 | cqr->starttime = 0; |
1da177e4 LT |
728 | DBF_DEV_EVENT(DBF_DEBUG, device, |
729 | "terminate cqr %p successful", | |
730 | cqr); | |
731 | break; | |
732 | case -ENODEV: | |
733 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
734 | "device gone, retry"); | |
735 | break; | |
736 | case -EIO: | |
737 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
738 | "I/O error, retry"); | |
739 | break; | |
740 | case -EINVAL: | |
741 | case -EBUSY: | |
742 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
743 | "device busy, retry later"); | |
744 | break; | |
745 | default: | |
746 | DEV_MESSAGE(KERN_ERR, device, | |
747 | "line %d unknown RC=%d, please " | |
748 | "report to linux390@de.ibm.com", | |
749 | __LINE__, rc); | |
750 | BUG(); | |
751 | break; | |
752 | } | |
753 | retries++; | |
754 | } | |
755 | dasd_schedule_bh(device); | |
756 | return rc; | |
757 | } | |
758 | ||
759 | /* | |
760 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
761 | * In that case set up a timer to start the request later. | |
762 | */ | |
763 | int | |
764 | dasd_start_IO(struct dasd_ccw_req * cqr) | |
765 | { | |
766 | struct dasd_device *device; | |
767 | int rc; | |
768 | ||
769 | /* Check the cqr */ | |
770 | rc = dasd_check_cqr(cqr); | |
771 | if (rc) | |
772 | return rc; | |
773 | device = (struct dasd_device *) cqr->device; | |
774 | if (cqr->retries < 0) { | |
775 | DEV_MESSAGE(KERN_DEBUG, device, | |
776 | "start_IO: request %p (%02x/%i) - no retry left.", | |
777 | cqr, cqr->status, cqr->retries); | |
778 | cqr->status = DASD_CQR_FAILED; | |
779 | return -EIO; | |
780 | } | |
781 | cqr->startclk = get_clock(); | |
782 | cqr->starttime = jiffies; | |
783 | cqr->retries--; | |
784 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
785 | cqr->lpm, 0); | |
786 | switch (rc) { | |
787 | case 0: | |
788 | cqr->status = DASD_CQR_IN_IO; | |
789 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
790 | "start_IO: request %p started successful", | |
791 | cqr); | |
792 | break; | |
793 | case -EBUSY: | |
794 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
795 | "start_IO: device busy, retry later"); | |
796 | break; | |
797 | case -ETIMEDOUT: | |
798 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
799 | "start_IO: request timeout, retry later"); | |
800 | break; | |
801 | case -EACCES: | |
802 | /* -EACCES indicates that the request used only a | |
803 | * subset of the available pathes and all these | |
804 | * pathes are gone. | |
805 | * Do a retry with all available pathes. | |
806 | */ | |
807 | cqr->lpm = LPM_ANYPATH; | |
808 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
809 | "start_IO: selected pathes gone," | |
810 | " retry on all pathes"); | |
811 | break; | |
812 | case -ENODEV: | |
813 | case -EIO: | |
814 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
815 | "start_IO: device gone, retry"); | |
816 | break; | |
817 | default: | |
818 | DEV_MESSAGE(KERN_ERR, device, | |
819 | "line %d unknown RC=%d, please report" | |
820 | " to linux390@de.ibm.com", __LINE__, rc); | |
821 | BUG(); | |
822 | break; | |
823 | } | |
824 | return rc; | |
825 | } | |
826 | ||
827 | /* | |
828 | * Timeout function for dasd devices. This is used for different purposes | |
829 | * 1) missing interrupt handler for normal operation | |
830 | * 2) delayed start of request where start_IO failed with -EBUSY | |
831 | * 3) timeout for missing state change interrupts | |
832 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
833 | * DASD_CQR_QUEUED for 2) and 3). | |
834 | */ | |
835 | static void | |
836 | dasd_timeout_device(unsigned long ptr) | |
837 | { | |
838 | unsigned long flags; | |
839 | struct dasd_device *device; | |
840 | ||
841 | device = (struct dasd_device *) ptr; | |
842 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
843 | /* re-activate request queue */ | |
844 | device->stopped &= ~DASD_STOPPED_PENDING; | |
845 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
846 | dasd_schedule_bh(device); | |
847 | } | |
848 | ||
849 | /* | |
850 | * Setup timeout for a device in jiffies. | |
851 | */ | |
852 | void | |
853 | dasd_set_timer(struct dasd_device *device, int expires) | |
854 | { | |
855 | if (expires == 0) { | |
856 | if (timer_pending(&device->timer)) | |
857 | del_timer(&device->timer); | |
858 | return; | |
859 | } | |
860 | if (timer_pending(&device->timer)) { | |
861 | if (mod_timer(&device->timer, jiffies + expires)) | |
862 | return; | |
863 | } | |
864 | device->timer.function = dasd_timeout_device; | |
865 | device->timer.data = (unsigned long) device; | |
866 | device->timer.expires = jiffies + expires; | |
867 | add_timer(&device->timer); | |
868 | } | |
869 | ||
870 | /* | |
871 | * Clear timeout for a device. | |
872 | */ | |
873 | void | |
874 | dasd_clear_timer(struct dasd_device *device) | |
875 | { | |
876 | if (timer_pending(&device->timer)) | |
877 | del_timer(&device->timer); | |
878 | } | |
879 | ||
880 | static void | |
881 | dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm) | |
882 | { | |
883 | struct dasd_ccw_req *cqr; | |
884 | struct dasd_device *device; | |
885 | ||
886 | cqr = (struct dasd_ccw_req *) intparm; | |
887 | if (cqr->status != DASD_CQR_IN_IO) { | |
888 | MESSAGE(KERN_DEBUG, | |
889 | "invalid status in handle_killed_request: " | |
890 | "bus_id %s, status %02x", | |
891 | cdev->dev.bus_id, cqr->status); | |
892 | return; | |
893 | } | |
894 | ||
895 | device = (struct dasd_device *) cqr->device; | |
896 | if (device == NULL || | |
a00bfd71 | 897 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 LT |
898 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
899 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
900 | cdev->dev.bus_id); | |
901 | return; | |
902 | } | |
903 | ||
904 | /* Schedule request to be retried. */ | |
905 | cqr->status = DASD_CQR_QUEUED; | |
906 | ||
907 | dasd_clear_timer(device); | |
908 | dasd_schedule_bh(device); | |
909 | dasd_put_device(device); | |
910 | } | |
911 | ||
912 | static void | |
913 | dasd_handle_state_change_pending(struct dasd_device *device) | |
914 | { | |
915 | struct dasd_ccw_req *cqr; | |
916 | struct list_head *l, *n; | |
917 | ||
20c64468 SW |
918 | /* First of all start sense subsystem status request. */ |
919 | dasd_eer_snss(device); | |
920 | ||
1da177e4 LT |
921 | device->stopped &= ~DASD_STOPPED_PENDING; |
922 | ||
923 | /* restart all 'running' IO on queue */ | |
924 | list_for_each_safe(l, n, &device->ccw_queue) { | |
925 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
926 | if (cqr->status == DASD_CQR_IN_IO) { | |
927 | cqr->status = DASD_CQR_QUEUED; | |
928 | } | |
929 | } | |
930 | dasd_clear_timer(device); | |
931 | dasd_schedule_bh(device); | |
932 | } | |
933 | ||
934 | /* | |
935 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
936 | */ | |
937 | void | |
938 | dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
939 | struct irb *irb) | |
940 | { | |
941 | struct dasd_ccw_req *cqr, *next; | |
942 | struct dasd_device *device; | |
943 | unsigned long long now; | |
944 | int expires; | |
945 | dasd_era_t era; | |
946 | char mask; | |
947 | ||
948 | if (IS_ERR(irb)) { | |
949 | switch (PTR_ERR(irb)) { | |
950 | case -EIO: | |
951 | dasd_handle_killed_request(cdev, intparm); | |
952 | break; | |
953 | case -ETIMEDOUT: | |
954 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
955 | __FUNCTION__, cdev->dev.bus_id); | |
956 | //FIXME - dasd uses own timeout interface... | |
957 | break; | |
958 | default: | |
959 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
960 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); | |
961 | } | |
962 | return; | |
963 | } | |
964 | ||
965 | now = get_clock(); | |
966 | ||
967 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
968 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), | |
969 | (unsigned int) intparm); | |
970 | ||
971 | /* first of all check for state change pending interrupt */ | |
972 | mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; | |
973 | if ((irb->scsw.dstat & mask) == mask) { | |
a00bfd71 | 974 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
975 | if (!IS_ERR(device)) { |
976 | dasd_handle_state_change_pending(device); | |
977 | dasd_put_device(device); | |
978 | } | |
979 | return; | |
980 | } | |
981 | ||
982 | cqr = (struct dasd_ccw_req *) intparm; | |
983 | ||
984 | /* check for unsolicited interrupts */ | |
985 | if (cqr == NULL) { | |
986 | MESSAGE(KERN_DEBUG, | |
987 | "unsolicited interrupt received: bus_id %s", | |
988 | cdev->dev.bus_id); | |
989 | return; | |
990 | } | |
991 | ||
992 | device = (struct dasd_device *) cqr->device; | |
993 | if (device == NULL || | |
994 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
995 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
996 | cdev->dev.bus_id); | |
997 | return; | |
998 | } | |
999 | ||
1000 | /* Check for clear pending */ | |
1001 | if (cqr->status == DASD_CQR_CLEAR && | |
1002 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { | |
1003 | cqr->status = DASD_CQR_QUEUED; | |
1004 | dasd_clear_timer(device); | |
8f61701b | 1005 | wake_up(&dasd_flush_wq); |
1da177e4 LT |
1006 | dasd_schedule_bh(device); |
1007 | return; | |
1008 | } | |
1009 | ||
1010 | /* check status - the request might have been killed by dyn detach */ | |
1011 | if (cqr->status != DASD_CQR_IN_IO) { | |
1012 | MESSAGE(KERN_DEBUG, | |
1013 | "invalid status: bus_id %s, status %02x", | |
1014 | cdev->dev.bus_id, cqr->status); | |
1015 | return; | |
1016 | } | |
1017 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
1018 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); | |
1019 | ||
1020 | /* Find out the appropriate era_action. */ | |
138c014d | 1021 | if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) |
1da177e4 LT |
1022 | era = dasd_era_fatal; |
1023 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
1024 | irb->scsw.cstat == 0 && | |
1025 | !irb->esw.esw0.erw.cons) | |
1026 | era = dasd_era_none; | |
1027 | else if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) | |
1028 | era = dasd_era_fatal; /* don't recover this request */ | |
1029 | else if (irb->esw.esw0.erw.cons) | |
1030 | era = device->discipline->examine_error(cqr, irb); | |
138c014d | 1031 | else |
1da177e4 LT |
1032 | era = dasd_era_recover; |
1033 | ||
1034 | DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); | |
1035 | expires = 0; | |
1036 | if (era == dasd_era_none) { | |
1037 | cqr->status = DASD_CQR_DONE; | |
1038 | cqr->stopclk = now; | |
1039 | /* Start first request on queue if possible -> fast_io. */ | |
1040 | if (cqr->list.next != &device->ccw_queue) { | |
1041 | next = list_entry(cqr->list.next, | |
1042 | struct dasd_ccw_req, list); | |
1043 | if ((next->status == DASD_CQR_QUEUED) && | |
1044 | (!device->stopped)) { | |
1045 | if (device->discipline->start_IO(next) == 0) | |
1046 | expires = next->expires; | |
1047 | else | |
1048 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1049 | "Interrupt fastpath " | |
1050 | "failed!"); | |
1051 | } | |
1052 | } | |
1053 | } else { /* error */ | |
1054 | memcpy(&cqr->irb, irb, sizeof (struct irb)); | |
1055 | #ifdef ERP_DEBUG | |
1056 | /* dump sense data */ | |
1057 | dasd_log_sense(cqr, irb); | |
1058 | #endif | |
1059 | switch (era) { | |
1060 | case dasd_era_fatal: | |
1061 | cqr->status = DASD_CQR_FAILED; | |
1062 | cqr->stopclk = now; | |
1063 | break; | |
1064 | case dasd_era_recover: | |
1065 | cqr->status = DASD_CQR_ERROR; | |
1066 | break; | |
1067 | default: | |
1068 | BUG(); | |
1069 | } | |
1070 | } | |
1071 | if (expires != 0) | |
1072 | dasd_set_timer(device, expires); | |
1073 | else | |
1074 | dasd_clear_timer(device); | |
1075 | dasd_schedule_bh(device); | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * posts the buffer_cache about a finalized request | |
1080 | */ | |
1081 | static inline void | |
1082 | dasd_end_request(struct request *req, int uptodate) | |
1083 | { | |
1084 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) | |
1085 | BUG(); | |
1086 | add_disk_randomness(req->rq_disk); | |
8ffdc655 | 1087 | end_that_request_last(req, uptodate); |
1da177e4 LT |
1088 | } |
1089 | ||
1090 | /* | |
1091 | * Process finished error recovery ccw. | |
1092 | */ | |
1093 | static inline void | |
1094 | __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr) | |
1095 | { | |
1096 | dasd_erp_fn_t erp_fn; | |
1097 | ||
1098 | if (cqr->status == DASD_CQR_DONE) | |
1099 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1100 | else | |
1101 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1102 | erp_fn = device->discipline->erp_postaction(cqr); | |
1103 | erp_fn(cqr); | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * Process ccw request queue. | |
1108 | */ | |
1109 | static inline void | |
1110 | __dasd_process_ccw_queue(struct dasd_device * device, | |
1111 | struct list_head *final_queue) | |
1112 | { | |
1113 | struct list_head *l, *n; | |
1114 | struct dasd_ccw_req *cqr; | |
1115 | dasd_erp_fn_t erp_fn; | |
1116 | ||
1117 | restart: | |
1118 | /* Process request with final status. */ | |
1119 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1120 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1121 | /* Stop list processing at the first non-final request. */ | |
1122 | if (cqr->status != DASD_CQR_DONE && | |
1123 | cqr->status != DASD_CQR_FAILED && | |
1124 | cqr->status != DASD_CQR_ERROR) | |
1125 | break; | |
1126 | /* Process requests with DASD_CQR_ERROR */ | |
1127 | if (cqr->status == DASD_CQR_ERROR) { | |
1128 | if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) { | |
1129 | cqr->status = DASD_CQR_FAILED; | |
1130 | cqr->stopclk = get_clock(); | |
1131 | } else { | |
1132 | if (cqr->irb.esw.esw0.erw.cons) { | |
1133 | erp_fn = device->discipline-> | |
1134 | erp_action(cqr); | |
1135 | erp_fn(cqr); | |
1136 | } else | |
1137 | dasd_default_erp_action(cqr); | |
1138 | } | |
1139 | goto restart; | |
1140 | } | |
20c64468 SW |
1141 | |
1142 | /* First of all call extended error reporting. */ | |
1143 | if (dasd_eer_enabled(device) && | |
1144 | cqr->status == DASD_CQR_FAILED) { | |
1145 | dasd_eer_write(device, cqr, DASD_EER_FATALERROR); | |
1146 | ||
1147 | /* restart request */ | |
1148 | cqr->status = DASD_CQR_QUEUED; | |
1149 | cqr->retries = 255; | |
1150 | device->stopped |= DASD_STOPPED_QUIESCE; | |
1151 | goto restart; | |
1152 | } | |
1153 | ||
1da177e4 LT |
1154 | /* Process finished ERP request. */ |
1155 | if (cqr->refers) { | |
1156 | __dasd_process_erp(device, cqr); | |
1157 | goto restart; | |
1158 | } | |
1159 | ||
1160 | /* Rechain finished requests to final queue */ | |
1161 | cqr->endclk = get_clock(); | |
1162 | list_move_tail(&cqr->list, final_queue); | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | static void | |
1167 | dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data) | |
1168 | { | |
1169 | struct request *req; | |
1170 | struct dasd_device *device; | |
1171 | int status; | |
1172 | ||
1173 | req = (struct request *) data; | |
1174 | device = cqr->device; | |
1175 | dasd_profile_end(device, cqr, req); | |
1176 | status = cqr->device->discipline->free_cp(cqr,req); | |
1177 | spin_lock_irq(&device->request_queue_lock); | |
1178 | dasd_end_request(req, status); | |
1179 | spin_unlock_irq(&device->request_queue_lock); | |
1180 | } | |
1181 | ||
1182 | ||
1183 | /* | |
1184 | * Fetch requests from the block device queue. | |
1185 | */ | |
1186 | static inline void | |
1187 | __dasd_process_blk_queue(struct dasd_device * device) | |
1188 | { | |
1189 | request_queue_t *queue; | |
1190 | struct request *req; | |
1191 | struct dasd_ccw_req *cqr; | |
c6eb7b77 | 1192 | int nr_queued; |
1da177e4 LT |
1193 | |
1194 | queue = device->request_queue; | |
1195 | /* No queue ? Then there is nothing to do. */ | |
1196 | if (queue == NULL) | |
1197 | return; | |
1198 | ||
1199 | /* | |
1200 | * We requeue request from the block device queue to the ccw | |
1201 | * queue only in two states. In state DASD_STATE_READY the | |
1202 | * partition detection is done and we need to requeue requests | |
1203 | * for that. State DASD_STATE_ONLINE is normal block device | |
1204 | * operation. | |
1205 | */ | |
1206 | if (device->state != DASD_STATE_READY && | |
1207 | device->state != DASD_STATE_ONLINE) | |
1208 | return; | |
1209 | nr_queued = 0; | |
1210 | /* Now we try to fetch requests from the request queue */ | |
1211 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1212 | if (cqr->status == DASD_CQR_QUEUED) | |
1213 | nr_queued++; | |
1214 | while (!blk_queue_plugged(queue) && | |
1215 | elv_next_request(queue) && | |
1216 | nr_queued < DASD_CHANQ_MAX_SIZE) { | |
1217 | req = elv_next_request(queue); | |
f24acd45 | 1218 | |
c6eb7b77 HH |
1219 | if (device->features & DASD_FEATURE_READONLY && |
1220 | rq_data_dir(req) == WRITE) { | |
1da177e4 LT |
1221 | DBF_DEV_EVENT(DBF_ERR, device, |
1222 | "Rejecting write request %p", | |
1223 | req); | |
1224 | blkdev_dequeue_request(req); | |
1225 | dasd_end_request(req, 0); | |
1226 | continue; | |
1227 | } | |
1228 | if (device->stopped & DASD_STOPPED_DC_EIO) { | |
1229 | blkdev_dequeue_request(req); | |
1230 | dasd_end_request(req, 0); | |
1231 | continue; | |
1232 | } | |
1233 | cqr = device->discipline->build_cp(device, req); | |
1234 | if (IS_ERR(cqr)) { | |
1235 | if (PTR_ERR(cqr) == -ENOMEM) | |
1236 | break; /* terminate request queue loop */ | |
1237 | DBF_DEV_EVENT(DBF_ERR, device, | |
1238 | "CCW creation failed (rc=%ld) " | |
1239 | "on request %p", | |
1240 | PTR_ERR(cqr), req); | |
1241 | blkdev_dequeue_request(req); | |
1242 | dasd_end_request(req, 0); | |
1243 | continue; | |
1244 | } | |
1245 | cqr->callback = dasd_end_request_cb; | |
1246 | cqr->callback_data = (void *) req; | |
1247 | cqr->status = DASD_CQR_QUEUED; | |
1248 | blkdev_dequeue_request(req); | |
1249 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1250 | dasd_profile_start(device, cqr, req); | |
1251 | nr_queued++; | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Take a look at the first request on the ccw queue and check | |
1257 | * if it reached its expire time. If so, terminate the IO. | |
1258 | */ | |
1259 | static inline void | |
1260 | __dasd_check_expire(struct dasd_device * device) | |
1261 | { | |
1262 | struct dasd_ccw_req *cqr; | |
1263 | ||
1264 | if (list_empty(&device->ccw_queue)) | |
1265 | return; | |
1266 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
29145a6c HH |
1267 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1268 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1269 | if (device->discipline->term_IO(cqr) != 0) { | |
1270 | /* Hmpf, try again in 5 sec */ | |
1271 | dasd_set_timer(device, 5*HZ); | |
1272 | DEV_MESSAGE(KERN_ERR, device, | |
1273 | "internal error - timeout (%is) expired " | |
1274 | "for cqr %p, termination failed, " | |
1275 | "retrying in 5s", | |
1276 | (cqr->expires/HZ), cqr); | |
1277 | } else { | |
8f61701b HH |
1278 | DEV_MESSAGE(KERN_ERR, device, |
1279 | "internal error - timeout (%is) expired " | |
1280 | "for cqr %p (%i retries left)", | |
1281 | (cqr->expires/HZ), cqr, cqr->retries); | |
1da177e4 LT |
1282 | } |
1283 | } | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * Take a look at the first request on the ccw queue and check | |
1288 | * if it needs to be started. | |
1289 | */ | |
1290 | static inline void | |
1291 | __dasd_start_head(struct dasd_device * device) | |
1292 | { | |
1293 | struct dasd_ccw_req *cqr; | |
1294 | int rc; | |
1295 | ||
1296 | if (list_empty(&device->ccw_queue)) | |
1297 | return; | |
1298 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
25ee4cf8 PO |
1299 | if (cqr->status != DASD_CQR_QUEUED) |
1300 | return; | |
1301 | /* Non-temporary stop condition will trigger fail fast */ | |
1c01b8a5 | 1302 | if (device->stopped & ~DASD_STOPPED_PENDING && |
20c64468 SW |
1303 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
1304 | (!dasd_eer_enabled(device))) { | |
1c01b8a5 HH |
1305 | cqr->status = DASD_CQR_FAILED; |
1306 | dasd_schedule_bh(device); | |
25ee4cf8 | 1307 | return; |
1c01b8a5 | 1308 | } |
25ee4cf8 PO |
1309 | /* Don't try to start requests if device is stopped */ |
1310 | if (device->stopped) | |
1311 | return; | |
1312 | ||
1313 | rc = device->discipline->start_IO(cqr); | |
1314 | if (rc == 0) | |
1315 | dasd_set_timer(device, cqr->expires); | |
1316 | else if (rc == -EACCES) { | |
1317 | dasd_schedule_bh(device); | |
1318 | } else | |
1319 | /* Hmpf, try again in 1/2 sec */ | |
1320 | dasd_set_timer(device, 50); | |
1da177e4 LT |
1321 | } |
1322 | ||
8f61701b HH |
1323 | static inline int |
1324 | _wait_for_clear(struct dasd_ccw_req *cqr) | |
1325 | { | |
1326 | return (cqr->status == DASD_CQR_QUEUED); | |
1327 | } | |
1328 | ||
1da177e4 | 1329 | /* |
8f61701b HH |
1330 | * Remove all requests from the ccw queue (all = '1') or only block device |
1331 | * requests in case all = '0'. | |
1332 | * Take care of the erp-chain (chained via cqr->refers) and remove either | |
1333 | * the whole erp-chain or none of the erp-requests. | |
1334 | * If a request is currently running, term_IO is called and the request | |
1335 | * is re-queued. Prior to removing the terminated request we need to wait | |
1336 | * for the clear-interrupt. | |
1337 | * In case termination is not possible we stop processing and just finishing | |
1338 | * the already moved requests. | |
1da177e4 | 1339 | */ |
8f61701b | 1340 | static int |
1da177e4 LT |
1341 | dasd_flush_ccw_queue(struct dasd_device * device, int all) |
1342 | { | |
8f61701b HH |
1343 | struct dasd_ccw_req *cqr, *orig, *n; |
1344 | int rc, i; | |
1345 | ||
1da177e4 | 1346 | struct list_head flush_queue; |
1da177e4 LT |
1347 | |
1348 | INIT_LIST_HEAD(&flush_queue); | |
1349 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b HH |
1350 | rc = 0; |
1351 | restart: | |
1352 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, list) { | |
1353 | /* get original request of erp request-chain */ | |
1354 | for (orig = cqr; orig->refers != NULL; orig = orig->refers); | |
1355 | ||
1da177e4 | 1356 | /* Flush all request or only block device requests? */ |
8f61701b HH |
1357 | if (all == 0 && cqr->callback != dasd_end_request_cb && |
1358 | orig->callback != dasd_end_request_cb) { | |
1da177e4 | 1359 | continue; |
8f61701b HH |
1360 | } |
1361 | /* Check status and move request to flush_queue */ | |
1362 | switch (cqr->status) { | |
1363 | case DASD_CQR_IN_IO: | |
1364 | rc = device->discipline->term_IO(cqr); | |
1365 | if (rc) { | |
1366 | /* unable to terminate requeust */ | |
1367 | DEV_MESSAGE(KERN_ERR, device, | |
1368 | "dasd flush ccw_queue is unable " | |
1369 | " to terminate request %p", | |
1370 | cqr); | |
1371 | /* stop flush processing */ | |
1372 | goto finished; | |
1373 | } | |
1374 | break; | |
1375 | case DASD_CQR_QUEUED: | |
1376 | case DASD_CQR_ERROR: | |
1377 | /* set request to FAILED */ | |
1da177e4 | 1378 | cqr->stopclk = get_clock(); |
8f61701b HH |
1379 | cqr->status = DASD_CQR_FAILED; |
1380 | break; | |
1381 | default: /* do not touch the others */ | |
1382 | break; | |
1383 | } | |
1384 | /* Rechain request (including erp chain) */ | |
1385 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) { | |
1386 | cqr->endclk = get_clock(); | |
1387 | list_move_tail(&cqr->list, &flush_queue); | |
1388 | } | |
1389 | if (i > 1) | |
1390 | /* moved more than one request - need to restart */ | |
1391 | goto restart; | |
1392 | } | |
1393 | ||
1394 | finished: | |
1395 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1396 | /* Now call the callback function of flushed requests */ | |
1397 | restart_cb: | |
1398 | list_for_each_entry_safe(cqr, n, &flush_queue, list) { | |
1399 | if (cqr->status == DASD_CQR_CLEAR) { | |
1400 | /* wait for clear interrupt! */ | |
1401 | wait_event(dasd_flush_wq, _wait_for_clear(cqr)); | |
1402 | cqr->status = DASD_CQR_FAILED; | |
1da177e4 LT |
1403 | } |
1404 | /* Process finished ERP request. */ | |
1405 | if (cqr->refers) { | |
1406 | __dasd_process_erp(device, cqr); | |
8f61701b HH |
1407 | /* restart list_for_xx loop since dasd_process_erp |
1408 | * might remove multiple elements */ | |
1409 | goto restart_cb; | |
1da177e4 | 1410 | } |
8f61701b | 1411 | /* call the callback function */ |
1da177e4 | 1412 | cqr->endclk = get_clock(); |
1da177e4 LT |
1413 | if (cqr->callback != NULL) |
1414 | (cqr->callback)(cqr, cqr->callback_data); | |
1415 | } | |
8f61701b | 1416 | return rc; |
1da177e4 LT |
1417 | } |
1418 | ||
1419 | /* | |
1420 | * Acquire the device lock and process queues for the device. | |
1421 | */ | |
1422 | static void | |
1423 | dasd_tasklet(struct dasd_device * device) | |
1424 | { | |
1425 | struct list_head final_queue; | |
1426 | struct list_head *l, *n; | |
1427 | struct dasd_ccw_req *cqr; | |
1428 | ||
1429 | atomic_set (&device->tasklet_scheduled, 0); | |
1430 | INIT_LIST_HEAD(&final_queue); | |
1431 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1432 | /* Check expire time of first request on the ccw queue. */ | |
1433 | __dasd_check_expire(device); | |
1434 | /* Finish off requests on ccw queue */ | |
1435 | __dasd_process_ccw_queue(device, &final_queue); | |
1436 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1437 | /* Now call the callback function of requests with final status */ | |
1438 | list_for_each_safe(l, n, &final_queue) { | |
1439 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
c2ba444d | 1440 | list_del_init(&cqr->list); |
1da177e4 LT |
1441 | if (cqr->callback != NULL) |
1442 | (cqr->callback)(cqr, cqr->callback_data); | |
1443 | } | |
1444 | spin_lock_irq(&device->request_queue_lock); | |
1445 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1446 | /* Get new request from the block device request queue */ | |
1447 | __dasd_process_blk_queue(device); | |
1448 | /* Now check if the head of the ccw queue needs to be started. */ | |
1449 | __dasd_start_head(device); | |
1450 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1451 | spin_unlock_irq(&device->request_queue_lock); | |
1452 | dasd_put_device(device); | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1457 | */ | |
1458 | void | |
1459 | dasd_schedule_bh(struct dasd_device * device) | |
1460 | { | |
1461 | /* Protect against rescheduling. */ | |
973bd993 | 1462 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1463 | return; |
1464 | dasd_get_device(device); | |
1465 | tasklet_hi_schedule(&device->tasklet); | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Queue a request to the head of the ccw_queue. Start the I/O if | |
1470 | * possible. | |
1471 | */ | |
1472 | void | |
1473 | dasd_add_request_head(struct dasd_ccw_req *req) | |
1474 | { | |
1475 | struct dasd_device *device; | |
1476 | unsigned long flags; | |
1477 | ||
1478 | device = req->device; | |
1479 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1480 | req->status = DASD_CQR_QUEUED; | |
1481 | req->device = device; | |
1482 | list_add(&req->list, &device->ccw_queue); | |
1483 | /* let the bh start the request to keep them in order */ | |
1484 | dasd_schedule_bh(device); | |
1485 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Queue a request to the tail of the ccw_queue. Start the I/O if | |
1490 | * possible. | |
1491 | */ | |
1492 | void | |
1493 | dasd_add_request_tail(struct dasd_ccw_req *req) | |
1494 | { | |
1495 | struct dasd_device *device; | |
1496 | unsigned long flags; | |
1497 | ||
1498 | device = req->device; | |
1499 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1500 | req->status = DASD_CQR_QUEUED; | |
1501 | req->device = device; | |
1502 | list_add_tail(&req->list, &device->ccw_queue); | |
1503 | /* let the bh start the request to keep them in order */ | |
1504 | dasd_schedule_bh(device); | |
1505 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1506 | } | |
1507 | ||
1508 | /* | |
1509 | * Wakeup callback. | |
1510 | */ | |
1511 | static void | |
1512 | dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) | |
1513 | { | |
1514 | wake_up((wait_queue_head_t *) data); | |
1515 | } | |
1516 | ||
1517 | static inline int | |
1518 | _wait_for_wakeup(struct dasd_ccw_req *cqr) | |
1519 | { | |
1520 | struct dasd_device *device; | |
1521 | int rc; | |
1522 | ||
1523 | device = cqr->device; | |
1524 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1525 | rc = ((cqr->status == DASD_CQR_DONE || |
1526 | cqr->status == DASD_CQR_FAILED) && | |
1527 | list_empty(&cqr->list)); | |
1da177e4 LT |
1528 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1529 | return rc; | |
1530 | } | |
1531 | ||
1532 | /* | |
1533 | * Attempts to start a special ccw queue and waits for its completion. | |
1534 | */ | |
1535 | int | |
1536 | dasd_sleep_on(struct dasd_ccw_req * cqr) | |
1537 | { | |
1538 | wait_queue_head_t wait_q; | |
1539 | struct dasd_device *device; | |
1540 | int rc; | |
138c014d | 1541 | |
1da177e4 LT |
1542 | device = cqr->device; |
1543 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
138c014d | 1544 | |
1da177e4 LT |
1545 | init_waitqueue_head (&wait_q); |
1546 | cqr->callback = dasd_wakeup_cb; | |
1547 | cqr->callback_data = (void *) &wait_q; | |
1548 | cqr->status = DASD_CQR_QUEUED; | |
1549 | list_add_tail(&cqr->list, &device->ccw_queue); | |
138c014d | 1550 | |
1da177e4 LT |
1551 | /* let the bh start the request to keep them in order */ |
1552 | dasd_schedule_bh(device); | |
138c014d | 1553 | |
1da177e4 LT |
1554 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1555 | ||
1556 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1557 | |
1da177e4 LT |
1558 | /* Request status is either done or failed. */ |
1559 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1560 | return rc; | |
1561 | } | |
1562 | ||
1563 | /* | |
1564 | * Attempts to start a special ccw queue and wait interruptible | |
1565 | * for its completion. | |
1566 | */ | |
1567 | int | |
1568 | dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) | |
1569 | { | |
1570 | wait_queue_head_t wait_q; | |
1571 | struct dasd_device *device; | |
1572 | int rc, finished; | |
1573 | ||
1574 | device = cqr->device; | |
1575 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1576 | ||
1577 | init_waitqueue_head (&wait_q); | |
1578 | cqr->callback = dasd_wakeup_cb; | |
1579 | cqr->callback_data = (void *) &wait_q; | |
1580 | cqr->status = DASD_CQR_QUEUED; | |
1581 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1582 | ||
1583 | /* let the bh start the request to keep them in order */ | |
1584 | dasd_schedule_bh(device); | |
1585 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1586 | ||
1587 | finished = 0; | |
1588 | while (!finished) { | |
1589 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); | |
1590 | if (rc != -ERESTARTSYS) { | |
c2ba444d HH |
1591 | /* Request is final (done or failed) */ |
1592 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1da177e4 LT |
1593 | break; |
1594 | } | |
1595 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1596 | switch (cqr->status) { |
1597 | case DASD_CQR_IN_IO: | |
1598 | /* terminate runnig cqr */ | |
1599 | if (device->discipline->term_IO) { | |
1600 | cqr->retries = -1; | |
1601 | device->discipline->term_IO(cqr); | |
8f61701b HH |
1602 | /* wait (non-interruptible) for final status |
1603 | * because signal ist still pending */ | |
c2ba444d HH |
1604 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1605 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1606 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1607 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1608 | finished = 1; | |
1609 | } | |
1610 | break; | |
1611 | case DASD_CQR_QUEUED: | |
1612 | /* request */ | |
1613 | list_del_init(&cqr->list); | |
1614 | rc = -EIO; | |
1da177e4 | 1615 | finished = 1; |
c2ba444d HH |
1616 | break; |
1617 | default: | |
1618 | /* cqr with 'non-interruptable' status - just wait */ | |
1619 | break; | |
1da177e4 LT |
1620 | } |
1621 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1622 | } | |
1623 | return rc; | |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1628 | * for eckd devices) the currently running request has to be terminated | |
1629 | * and be put back to status queued, before the special request is added | |
1630 | * to the head of the queue. Then the special request is waited on normally. | |
1631 | */ | |
1632 | static inline int | |
1633 | _dasd_term_running_cqr(struct dasd_device *device) | |
1634 | { | |
1635 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1636 | |
1637 | if (list_empty(&device->ccw_queue)) | |
1638 | return 0; | |
1639 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
8f61701b | 1640 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1641 | } |
1642 | ||
1643 | int | |
1644 | dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) | |
1645 | { | |
1646 | wait_queue_head_t wait_q; | |
1647 | struct dasd_device *device; | |
1648 | int rc; | |
138c014d | 1649 | |
1da177e4 LT |
1650 | device = cqr->device; |
1651 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1652 | rc = _dasd_term_running_cqr(device); | |
1653 | if (rc) { | |
1654 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1655 | return rc; | |
1656 | } | |
138c014d | 1657 | |
1da177e4 LT |
1658 | init_waitqueue_head (&wait_q); |
1659 | cqr->callback = dasd_wakeup_cb; | |
1660 | cqr->callback_data = (void *) &wait_q; | |
1661 | cqr->status = DASD_CQR_QUEUED; | |
1662 | list_add(&cqr->list, &device->ccw_queue); | |
138c014d | 1663 | |
1da177e4 LT |
1664 | /* let the bh start the request to keep them in order */ |
1665 | dasd_schedule_bh(device); | |
138c014d | 1666 | |
1da177e4 LT |
1667 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1668 | ||
1669 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1670 | |
1da177e4 LT |
1671 | /* Request status is either done or failed. */ |
1672 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1673 | return rc; | |
1674 | } | |
1675 | ||
1676 | /* | |
1677 | * Cancels a request that was started with dasd_sleep_on_req. | |
1678 | * This is useful to timeout requests. The request will be | |
1679 | * terminated if it is currently in i/o. | |
1680 | * Returns 1 if the request has been terminated. | |
1681 | */ | |
1682 | int | |
1683 | dasd_cancel_req(struct dasd_ccw_req *cqr) | |
1684 | { | |
1685 | struct dasd_device *device = cqr->device; | |
1686 | unsigned long flags; | |
1687 | int rc; | |
1688 | ||
1689 | rc = 0; | |
1690 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1691 | switch (cqr->status) { | |
1692 | case DASD_CQR_QUEUED: | |
1693 | /* request was not started - just set to failed */ | |
1694 | cqr->status = DASD_CQR_FAILED; | |
1695 | break; | |
1696 | case DASD_CQR_IN_IO: | |
1697 | /* request in IO - terminate IO and release again */ | |
1698 | if (device->discipline->term_IO(cqr) != 0) | |
1699 | /* what to do if unable to terminate ?????? | |
1700 | e.g. not _IN_IO */ | |
1701 | cqr->status = DASD_CQR_FAILED; | |
1702 | cqr->stopclk = get_clock(); | |
1703 | rc = 1; | |
1704 | break; | |
1705 | case DASD_CQR_DONE: | |
1706 | case DASD_CQR_FAILED: | |
1707 | /* already finished - do nothing */ | |
1708 | break; | |
1709 | default: | |
1710 | DEV_MESSAGE(KERN_ALERT, device, | |
1711 | "invalid status %02x in request", | |
1712 | cqr->status); | |
1713 | BUG(); | |
1714 | ||
1715 | } | |
1716 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1717 | dasd_schedule_bh(device); | |
1718 | return rc; | |
1719 | } | |
1720 | ||
1721 | /* | |
1722 | * SECTION: Block device operations (request queue, partitions, open, release). | |
1723 | */ | |
1724 | ||
1725 | /* | |
1726 | * Dasd request queue function. Called from ll_rw_blk.c | |
1727 | */ | |
1728 | static void | |
1729 | do_dasd_request(request_queue_t * queue) | |
1730 | { | |
1731 | struct dasd_device *device; | |
1732 | ||
1733 | device = (struct dasd_device *) queue->queuedata; | |
1734 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1735 | /* Get new request from the block device request queue */ | |
1736 | __dasd_process_blk_queue(device); | |
1737 | /* Now check if the head of the ccw queue needs to be started. */ | |
1738 | __dasd_start_head(device); | |
1739 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1740 | } | |
1741 | ||
1742 | /* | |
1743 | * Allocate and initialize request queue and default I/O scheduler. | |
1744 | */ | |
1745 | static int | |
1746 | dasd_alloc_queue(struct dasd_device * device) | |
1747 | { | |
1748 | int rc; | |
1749 | ||
1750 | device->request_queue = blk_init_queue(do_dasd_request, | |
1751 | &device->request_queue_lock); | |
1752 | if (device->request_queue == NULL) | |
1753 | return -ENOMEM; | |
1754 | ||
1755 | device->request_queue->queuedata = device; | |
1756 | ||
1757 | elevator_exit(device->request_queue->elevator); | |
1758 | rc = elevator_init(device->request_queue, "deadline"); | |
1759 | if (rc) { | |
1760 | blk_cleanup_queue(device->request_queue); | |
1761 | return rc; | |
1762 | } | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | /* | |
1767 | * Allocate and initialize request queue. | |
1768 | */ | |
1769 | static void | |
1770 | dasd_setup_queue(struct dasd_device * device) | |
1771 | { | |
1772 | int max; | |
1773 | ||
1774 | blk_queue_hardsect_size(device->request_queue, device->bp_block); | |
1775 | max = device->discipline->max_blocks << device->s2b_shift; | |
1776 | blk_queue_max_sectors(device->request_queue, max); | |
1777 | blk_queue_max_phys_segments(device->request_queue, -1L); | |
1778 | blk_queue_max_hw_segments(device->request_queue, -1L); | |
1779 | blk_queue_max_segment_size(device->request_queue, -1L); | |
1780 | blk_queue_segment_boundary(device->request_queue, -1L); | |
ed68cb36 | 1781 | blk_queue_ordered(device->request_queue, QUEUE_ORDERED_TAG, NULL); |
1da177e4 LT |
1782 | } |
1783 | ||
1784 | /* | |
1785 | * Deactivate and free request queue. | |
1786 | */ | |
1787 | static void | |
1788 | dasd_free_queue(struct dasd_device * device) | |
1789 | { | |
1790 | if (device->request_queue) { | |
1791 | blk_cleanup_queue(device->request_queue); | |
1792 | device->request_queue = NULL; | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | /* | |
1797 | * Flush request on the request queue. | |
1798 | */ | |
1799 | static void | |
1800 | dasd_flush_request_queue(struct dasd_device * device) | |
1801 | { | |
1802 | struct request *req; | |
1803 | ||
1804 | if (!device->request_queue) | |
1805 | return; | |
138c014d | 1806 | |
1da177e4 | 1807 | spin_lock_irq(&device->request_queue_lock); |
8f61701b | 1808 | while ((req = elv_next_request(device->request_queue))) { |
1da177e4 | 1809 | blkdev_dequeue_request(req); |
ebc45999 | 1810 | dasd_end_request(req, 0); |
1da177e4 LT |
1811 | } |
1812 | spin_unlock_irq(&device->request_queue_lock); | |
1813 | } | |
1814 | ||
1815 | static int | |
1816 | dasd_open(struct inode *inp, struct file *filp) | |
1817 | { | |
1818 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1819 | struct dasd_device *device = disk->private_data; | |
1820 | int rc; | |
1821 | ||
1822 | atomic_inc(&device->open_count); | |
1823 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1824 | rc = -ENODEV; | |
1825 | goto unlock; | |
1826 | } | |
1827 | ||
1828 | if (!try_module_get(device->discipline->owner)) { | |
1829 | rc = -EINVAL; | |
1830 | goto unlock; | |
1831 | } | |
1832 | ||
1833 | if (dasd_probeonly) { | |
1834 | DEV_MESSAGE(KERN_INFO, device, "%s", | |
1835 | "No access to device due to probeonly mode"); | |
1836 | rc = -EPERM; | |
1837 | goto out; | |
1838 | } | |
1839 | ||
90f0094d | 1840 | if (device->state <= DASD_STATE_BASIC) { |
1da177e4 LT |
1841 | DBF_DEV_EVENT(DBF_ERR, device, " %s", |
1842 | " Cannot open unrecognized device"); | |
1843 | rc = -ENODEV; | |
1844 | goto out; | |
1845 | } | |
1846 | ||
1847 | return 0; | |
1848 | ||
1849 | out: | |
1850 | module_put(device->discipline->owner); | |
1851 | unlock: | |
1852 | atomic_dec(&device->open_count); | |
1853 | return rc; | |
1854 | } | |
1855 | ||
1856 | static int | |
1857 | dasd_release(struct inode *inp, struct file *filp) | |
1858 | { | |
1859 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1860 | struct dasd_device *device = disk->private_data; | |
1861 | ||
1862 | atomic_dec(&device->open_count); | |
1863 | module_put(device->discipline->owner); | |
1864 | return 0; | |
1865 | } | |
1866 | ||
a885c8c4 CH |
1867 | /* |
1868 | * Return disk geometry. | |
1869 | */ | |
1870 | static int | |
1871 | dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1872 | { | |
1873 | struct dasd_device *device; | |
1874 | ||
1875 | device = bdev->bd_disk->private_data; | |
1876 | if (!device) | |
1877 | return -ENODEV; | |
1878 | ||
1879 | if (!device->discipline || | |
1880 | !device->discipline->fill_geometry) | |
1881 | return -EINVAL; | |
1882 | ||
1883 | device->discipline->fill_geometry(device, geo); | |
1884 | geo->start = get_start_sect(bdev) >> device->s2b_shift; | |
1885 | return 0; | |
1886 | } | |
1887 | ||
1da177e4 LT |
1888 | struct block_device_operations |
1889 | dasd_device_operations = { | |
1890 | .owner = THIS_MODULE, | |
1891 | .open = dasd_open, | |
1892 | .release = dasd_release, | |
1893 | .ioctl = dasd_ioctl, | |
8262037f | 1894 | .compat_ioctl = dasd_compat_ioctl, |
a885c8c4 | 1895 | .getgeo = dasd_getgeo, |
1da177e4 LT |
1896 | }; |
1897 | ||
1898 | ||
1899 | static void | |
1900 | dasd_exit(void) | |
1901 | { | |
1902 | #ifdef CONFIG_PROC_FS | |
1903 | dasd_proc_exit(); | |
1904 | #endif | |
20c64468 | 1905 | dasd_eer_exit(); |
6bb0e010 HH |
1906 | if (dasd_page_cache != NULL) { |
1907 | kmem_cache_destroy(dasd_page_cache); | |
1908 | dasd_page_cache = NULL; | |
1909 | } | |
1da177e4 LT |
1910 | dasd_gendisk_exit(); |
1911 | dasd_devmap_exit(); | |
1da177e4 LT |
1912 | if (dasd_debug_area != NULL) { |
1913 | debug_unregister(dasd_debug_area); | |
1914 | dasd_debug_area = NULL; | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | /* | |
1919 | * SECTION: common functions for ccw_driver use | |
1920 | */ | |
1921 | ||
1c01b8a5 HH |
1922 | /* |
1923 | * Initial attempt at a probe function. this can be simplified once | |
1924 | * the other detection code is gone. | |
1925 | */ | |
1da177e4 LT |
1926 | int |
1927 | dasd_generic_probe (struct ccw_device *cdev, | |
1928 | struct dasd_discipline *discipline) | |
1929 | { | |
1930 | int ret; | |
1931 | ||
40545573 HH |
1932 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
1933 | if (ret) { | |
1934 | printk(KERN_WARNING | |
1935 | "dasd_generic_probe: could not set ccw-device options " | |
1936 | "for %s\n", cdev->dev.bus_id); | |
1937 | return ret; | |
1938 | } | |
1da177e4 LT |
1939 | ret = dasd_add_sysfs_files(cdev); |
1940 | if (ret) { | |
1941 | printk(KERN_WARNING | |
1942 | "dasd_generic_probe: could not add sysfs entries " | |
1943 | "for %s\n", cdev->dev.bus_id); | |
40545573 | 1944 | return ret; |
1da177e4 | 1945 | } |
40545573 | 1946 | cdev->handler = &dasd_int_handler; |
1da177e4 | 1947 | |
40545573 HH |
1948 | /* |
1949 | * Automatically online either all dasd devices (dasd_autodetect) | |
1950 | * or all devices specified with dasd= parameters during | |
1951 | * initial probe. | |
1952 | */ | |
1953 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
1954 | (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0)) | |
1955 | ret = ccw_device_set_online(cdev); | |
1956 | if (ret) | |
1957 | printk(KERN_WARNING | |
1958 | "dasd_generic_probe: could not initially online " | |
1959 | "ccw-device %s\n", cdev->dev.bus_id); | |
1da177e4 LT |
1960 | return ret; |
1961 | } | |
1962 | ||
1c01b8a5 HH |
1963 | /* |
1964 | * This will one day be called from a global not_oper handler. | |
1965 | * It is also used by driver_unregister during module unload. | |
1966 | */ | |
1da177e4 LT |
1967 | void |
1968 | dasd_generic_remove (struct ccw_device *cdev) | |
1969 | { | |
1970 | struct dasd_device *device; | |
1971 | ||
59afda78 HH |
1972 | cdev->handler = NULL; |
1973 | ||
1da177e4 LT |
1974 | dasd_remove_sysfs_files(cdev); |
1975 | device = dasd_device_from_cdev(cdev); | |
1976 | if (IS_ERR(device)) | |
1977 | return; | |
1978 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1979 | /* Already doing offline processing */ | |
1980 | dasd_put_device(device); | |
1981 | return; | |
1982 | } | |
1983 | /* | |
1984 | * This device is removed unconditionally. Set offline | |
1985 | * flag to prevent dasd_open from opening it while it is | |
1986 | * no quite down yet. | |
1987 | */ | |
1988 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1989 | /* dasd_delete_device destroys the device reference. */ | |
1990 | dasd_delete_device(device); | |
1991 | } | |
1992 | ||
1c01b8a5 HH |
1993 | /* |
1994 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 1995 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
1996 | * or the user has started activation through sysfs. |
1997 | */ | |
1da177e4 LT |
1998 | int |
1999 | dasd_generic_set_online (struct ccw_device *cdev, | |
aa88861f | 2000 | struct dasd_discipline *base_discipline) |
1da177e4 LT |
2001 | |
2002 | { | |
aa88861f | 2003 | struct dasd_discipline *discipline; |
1da177e4 | 2004 | struct dasd_device *device; |
c6eb7b77 | 2005 | int rc; |
f24acd45 | 2006 | |
40545573 HH |
2007 | /* first online clears initial online feature flag */ |
2008 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2009 | device = dasd_create_device(cdev); |
2010 | if (IS_ERR(device)) | |
2011 | return PTR_ERR(device); | |
2012 | ||
aa88861f | 2013 | discipline = base_discipline; |
c6eb7b77 | 2014 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
2015 | if (!dasd_diag_discipline_pointer) { |
2016 | printk (KERN_WARNING | |
2017 | "dasd_generic couldn't online device %s " | |
2018 | "- discipline DIAG not available\n", | |
2019 | cdev->dev.bus_id); | |
2020 | dasd_delete_device(device); | |
2021 | return -ENODEV; | |
2022 | } | |
2023 | discipline = dasd_diag_discipline_pointer; | |
2024 | } | |
aa88861f PO |
2025 | if (!try_module_get(base_discipline->owner)) { |
2026 | dasd_delete_device(device); | |
2027 | return -EINVAL; | |
2028 | } | |
2029 | if (!try_module_get(discipline->owner)) { | |
2030 | module_put(base_discipline->owner); | |
2031 | dasd_delete_device(device); | |
2032 | return -EINVAL; | |
2033 | } | |
2034 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2035 | device->discipline = discipline; |
2036 | ||
2037 | rc = discipline->check_device(device); | |
2038 | if (rc) { | |
2039 | printk (KERN_WARNING | |
2040 | "dasd_generic couldn't online device %s " | |
2041 | "with discipline %s rc=%i\n", | |
2042 | cdev->dev.bus_id, discipline->name, rc); | |
aa88861f PO |
2043 | module_put(discipline->owner); |
2044 | module_put(base_discipline->owner); | |
1da177e4 LT |
2045 | dasd_delete_device(device); |
2046 | return rc; | |
2047 | } | |
2048 | ||
2049 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2050 | if (device->state <= DASD_STATE_KNOWN) { | |
2051 | printk (KERN_WARNING | |
2052 | "dasd_generic discipline not found for %s\n", | |
2053 | cdev->dev.bus_id); | |
2054 | rc = -ENODEV; | |
2055 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2056 | dasd_delete_device(device); | |
2057 | } else | |
2058 | pr_debug("dasd_generic device %s found\n", | |
2059 | cdev->dev.bus_id); | |
2060 | ||
2061 | /* FIXME: we have to wait for the root device but we don't want | |
2062 | * to wait for each single device but for all at once. */ | |
2063 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2064 | ||
2065 | dasd_put_device(device); | |
2066 | ||
2067 | return rc; | |
2068 | } | |
2069 | ||
2070 | int | |
2071 | dasd_generic_set_offline (struct ccw_device *cdev) | |
2072 | { | |
2073 | struct dasd_device *device; | |
dafd87aa | 2074 | int max_count, open_count; |
1da177e4 LT |
2075 | |
2076 | device = dasd_device_from_cdev(cdev); | |
2077 | if (IS_ERR(device)) | |
2078 | return PTR_ERR(device); | |
2079 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2080 | /* Already doing offline processing */ | |
2081 | dasd_put_device(device); | |
2082 | return 0; | |
2083 | } | |
2084 | /* | |
2085 | * We must make sure that this device is currently not in use. | |
2086 | * The open_count is increased for every opener, that includes | |
2087 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2088 | * in the other openers. | |
2089 | */ | |
2090 | max_count = device->bdev ? 0 : -1; | |
dafd87aa HH |
2091 | open_count = (int) atomic_read(&device->open_count); |
2092 | if (open_count > max_count) { | |
2093 | if (open_count > 0) | |
2094 | printk (KERN_WARNING "Can't offline dasd device with " | |
2095 | "open count = %i.\n", | |
2096 | open_count); | |
2097 | else | |
2098 | printk (KERN_WARNING "%s", | |
2099 | "Can't offline dasd device due to internal " | |
2100 | "use\n"); | |
1da177e4 LT |
2101 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2102 | dasd_put_device(device); | |
2103 | return -EBUSY; | |
2104 | } | |
2105 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2106 | /* dasd_delete_device destroys the device reference. */ | |
2107 | dasd_delete_device(device); | |
2108 | ||
2109 | return 0; | |
2110 | } | |
2111 | ||
2112 | int | |
2113 | dasd_generic_notify(struct ccw_device *cdev, int event) | |
2114 | { | |
2115 | struct dasd_device *device; | |
2116 | struct dasd_ccw_req *cqr; | |
2117 | unsigned long flags; | |
2118 | int ret; | |
2119 | ||
2120 | device = dasd_device_from_cdev(cdev); | |
2121 | if (IS_ERR(device)) | |
2122 | return 0; | |
2123 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
2124 | ret = 0; | |
2125 | switch (event) { | |
2126 | case CIO_GONE: | |
2127 | case CIO_NO_PATH: | |
20c64468 SW |
2128 | /* First of all call extended error reporting. */ |
2129 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2130 | ||
1da177e4 LT |
2131 | if (device->state < DASD_STATE_BASIC) |
2132 | break; | |
2133 | /* Device is active. We want to keep it. */ | |
2134 | if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) { | |
2135 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2136 | if (cqr->status == DASD_CQR_IN_IO) | |
2137 | cqr->status = DASD_CQR_FAILED; | |
2138 | device->stopped |= DASD_STOPPED_DC_EIO; | |
1da177e4 LT |
2139 | } else { |
2140 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2141 | if (cqr->status == DASD_CQR_IN_IO) { | |
2142 | cqr->status = DASD_CQR_QUEUED; | |
2143 | cqr->retries++; | |
2144 | } | |
2145 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2146 | dasd_set_timer(device, 0); | |
2147 | } | |
1c01b8a5 | 2148 | dasd_schedule_bh(device); |
1da177e4 LT |
2149 | ret = 1; |
2150 | break; | |
2151 | case CIO_OPER: | |
2152 | /* FIXME: add a sanity check. */ | |
2153 | device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO); | |
2154 | dasd_schedule_bh(device); | |
2155 | ret = 1; | |
2156 | break; | |
2157 | } | |
2158 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
2159 | dasd_put_device(device); | |
2160 | return ret; | |
2161 | } | |
2162 | ||
20c64468 | 2163 | |
1da177e4 LT |
2164 | static int __init |
2165 | dasd_init(void) | |
2166 | { | |
2167 | int rc; | |
2168 | ||
2169 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2170 | init_waitqueue_head(&dasd_flush_wq); |
1da177e4 LT |
2171 | |
2172 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
66a464db | 2173 | dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long)); |
1da177e4 LT |
2174 | if (dasd_debug_area == NULL) { |
2175 | rc = -ENOMEM; | |
2176 | goto failed; | |
2177 | } | |
2178 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2179 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2180 | |
2181 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2182 | ||
2183 | dasd_diag_discipline_pointer = NULL; | |
2184 | ||
1da177e4 LT |
2185 | rc = dasd_devmap_init(); |
2186 | if (rc) | |
2187 | goto failed; | |
2188 | rc = dasd_gendisk_init(); | |
2189 | if (rc) | |
2190 | goto failed; | |
2191 | rc = dasd_parse(); | |
2192 | if (rc) | |
2193 | goto failed; | |
20c64468 SW |
2194 | rc = dasd_eer_init(); |
2195 | if (rc) | |
2196 | goto failed; | |
1da177e4 LT |
2197 | #ifdef CONFIG_PROC_FS |
2198 | rc = dasd_proc_init(); | |
2199 | if (rc) | |
2200 | goto failed; | |
2201 | #endif | |
2202 | ||
2203 | return 0; | |
2204 | failed: | |
2205 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2206 | dasd_exit(); | |
2207 | return rc; | |
2208 | } | |
2209 | ||
2210 | module_init(dasd_init); | |
2211 | module_exit(dasd_exit); | |
2212 | ||
2213 | EXPORT_SYMBOL(dasd_debug_area); | |
2214 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2215 | ||
2216 | EXPORT_SYMBOL(dasd_add_request_head); | |
2217 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2218 | EXPORT_SYMBOL(dasd_cancel_req); | |
2219 | EXPORT_SYMBOL(dasd_clear_timer); | |
2220 | EXPORT_SYMBOL(dasd_enable_device); | |
2221 | EXPORT_SYMBOL(dasd_int_handler); | |
2222 | EXPORT_SYMBOL(dasd_kfree_request); | |
2223 | EXPORT_SYMBOL(dasd_kick_device); | |
2224 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
2225 | EXPORT_SYMBOL(dasd_schedule_bh); | |
2226 | EXPORT_SYMBOL(dasd_set_target_state); | |
2227 | EXPORT_SYMBOL(dasd_set_timer); | |
2228 | EXPORT_SYMBOL(dasd_sfree_request); | |
2229 | EXPORT_SYMBOL(dasd_sleep_on); | |
2230 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2231 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2232 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2233 | EXPORT_SYMBOL(dasd_start_IO); | |
2234 | EXPORT_SYMBOL(dasd_term_IO); | |
2235 | ||
2236 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2237 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2238 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2239 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2240 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
1da177e4 | 2241 |