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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/kmod.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/ctype.h> | |
16 | #include <linux/major.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/buffer_head.h> | |
a885c8c4 | 19 | #include <linux/hdreg.h> |
1da177e4 LT |
20 | |
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/ebcdic.h> | |
23 | #include <asm/idals.h> | |
24 | #include <asm/todclk.h> | |
25 | ||
26 | /* This is ugly... */ | |
27 | #define PRINTK_HEADER "dasd:" | |
28 | ||
29 | #include "dasd_int.h" | |
30 | /* | |
31 | * SECTION: Constant definitions to be used within this file | |
32 | */ | |
33 | #define DASD_CHANQ_MAX_SIZE 4 | |
34 | ||
35 | /* | |
36 | * SECTION: exported variables of dasd.c | |
37 | */ | |
38 | debug_info_t *dasd_debug_area; | |
39 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 40 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
41 | |
42 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
43 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
44 | " Copyright 2000 IBM Corporation"); | |
45 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
46 | MODULE_LICENSE("GPL"); |
47 | ||
48 | /* | |
49 | * SECTION: prototypes for static functions of dasd.c | |
50 | */ | |
51 | static int dasd_alloc_queue(struct dasd_device * device); | |
52 | static void dasd_setup_queue(struct dasd_device * device); | |
53 | static void dasd_free_queue(struct dasd_device * device); | |
54 | static void dasd_flush_request_queue(struct dasd_device *); | |
8f61701b | 55 | static int dasd_flush_ccw_queue(struct dasd_device *, int); |
1da177e4 | 56 | static void dasd_tasklet(struct dasd_device *); |
4927b3f7 | 57 | static void do_kick_device(struct work_struct *); |
1da177e4 LT |
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); | |
4927b3f7 | 103 | INIT_WORK(&device->kick_work, do_kick_device); |
1da177e4 LT |
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 | |
4927b3f7 | 410 | do_kick_device(struct work_struct *work) |
1da177e4 | 411 | { |
4927b3f7 | 412 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
1da177e4 LT |
413 | dasd_change_state(device); |
414 | dasd_schedule_bh(device); | |
415 | dasd_put_device(device); | |
416 | } | |
417 | ||
418 | void | |
419 | dasd_kick_device(struct dasd_device *device) | |
420 | { | |
421 | dasd_get_device(device); | |
422 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
423 | schedule_work(&device->kick_work); | |
424 | } | |
425 | ||
426 | /* | |
427 | * Set the target state for a device and starts the state change. | |
428 | */ | |
429 | void | |
430 | dasd_set_target_state(struct dasd_device *device, int target) | |
431 | { | |
432 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
433 | if (dasd_probeonly && target > DASD_STATE_READY) | |
434 | target = DASD_STATE_READY; | |
435 | if (device->target != target) { | |
436 | if (device->state == target) | |
437 | wake_up(&dasd_init_waitq); | |
438 | device->target = target; | |
439 | } | |
440 | if (device->state != device->target) | |
441 | dasd_change_state(device); | |
442 | } | |
443 | ||
444 | /* | |
445 | * Enable devices with device numbers in [from..to]. | |
446 | */ | |
447 | static inline int | |
448 | _wait_for_device(struct dasd_device *device) | |
449 | { | |
450 | return (device->state == device->target); | |
451 | } | |
452 | ||
453 | void | |
454 | dasd_enable_device(struct dasd_device *device) | |
455 | { | |
456 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
457 | if (device->state <= DASD_STATE_KNOWN) | |
458 | /* No discipline for device found. */ | |
459 | dasd_set_target_state(device, DASD_STATE_NEW); | |
460 | /* Now wait for the devices to come up. */ | |
461 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
462 | } | |
463 | ||
464 | /* | |
465 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
466 | */ | |
467 | #ifdef CONFIG_DASD_PROFILE | |
468 | ||
469 | struct dasd_profile_info_t dasd_global_profile; | |
470 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
471 | ||
472 | /* | |
473 | * Increments counter in global and local profiling structures. | |
474 | */ | |
475 | #define dasd_profile_counter(value, counter, device) \ | |
476 | { \ | |
477 | int index; \ | |
478 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
479 | dasd_global_profile.counter[index]++; \ | |
480 | device->profile.counter[index]++; \ | |
481 | } | |
482 | ||
483 | /* | |
484 | * Add profiling information for cqr before execution. | |
485 | */ | |
4d284cac | 486 | static void |
1da177e4 LT |
487 | dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr, |
488 | struct request *req) | |
489 | { | |
490 | struct list_head *l; | |
491 | unsigned int counter; | |
492 | ||
493 | if (dasd_profile_level != DASD_PROFILE_ON) | |
494 | return; | |
495 | ||
496 | /* count the length of the chanq for statistics */ | |
497 | counter = 0; | |
498 | list_for_each(l, &device->ccw_queue) | |
499 | if (++counter >= 31) | |
500 | break; | |
501 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
502 | device->profile.dasd_io_nr_req[counter]++; | |
503 | } | |
504 | ||
505 | /* | |
506 | * Add profiling information for cqr after execution. | |
507 | */ | |
4d284cac | 508 | static void |
1da177e4 LT |
509 | dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr, |
510 | struct request *req) | |
511 | { | |
512 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
513 | long tottimeps, sectors; | |
514 | ||
515 | if (dasd_profile_level != DASD_PROFILE_ON) | |
516 | return; | |
517 | ||
518 | sectors = req->nr_sectors; | |
519 | if (!cqr->buildclk || !cqr->startclk || | |
520 | !cqr->stopclk || !cqr->endclk || | |
521 | !sectors) | |
522 | return; | |
523 | ||
524 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
525 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
526 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
527 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
528 | tottimeps = tottime / sectors; | |
529 | ||
530 | if (!dasd_global_profile.dasd_io_reqs) | |
531 | memset(&dasd_global_profile, 0, | |
532 | sizeof (struct dasd_profile_info_t)); | |
533 | dasd_global_profile.dasd_io_reqs++; | |
534 | dasd_global_profile.dasd_io_sects += sectors; | |
535 | ||
536 | if (!device->profile.dasd_io_reqs) | |
537 | memset(&device->profile, 0, | |
538 | sizeof (struct dasd_profile_info_t)); | |
539 | device->profile.dasd_io_reqs++; | |
540 | device->profile.dasd_io_sects += sectors; | |
541 | ||
542 | dasd_profile_counter(sectors, dasd_io_secs, device); | |
543 | dasd_profile_counter(tottime, dasd_io_times, device); | |
544 | dasd_profile_counter(tottimeps, dasd_io_timps, device); | |
545 | dasd_profile_counter(strtime, dasd_io_time1, device); | |
546 | dasd_profile_counter(irqtime, dasd_io_time2, device); | |
547 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device); | |
548 | dasd_profile_counter(endtime, dasd_io_time3, device); | |
549 | } | |
550 | #else | |
551 | #define dasd_profile_start(device, cqr, req) do {} while (0) | |
552 | #define dasd_profile_end(device, cqr, req) do {} while (0) | |
553 | #endif /* CONFIG_DASD_PROFILE */ | |
554 | ||
555 | /* | |
556 | * Allocate memory for a channel program with 'cplength' channel | |
557 | * command words and 'datasize' additional space. There are two | |
558 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
559 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
560 | * that gets allocated for each device. | |
561 | */ | |
562 | struct dasd_ccw_req * | |
563 | dasd_kmalloc_request(char *magic, int cplength, int datasize, | |
564 | struct dasd_device * device) | |
565 | { | |
566 | struct dasd_ccw_req *cqr; | |
567 | ||
568 | /* Sanity checks */ | |
7ac1e877 ES |
569 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
570 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 571 | |
88abaab4 | 572 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
573 | if (cqr == NULL) |
574 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
575 | cqr->cpaddr = NULL; |
576 | if (cplength > 0) { | |
88abaab4 | 577 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
578 | GFP_ATOMIC | GFP_DMA); |
579 | if (cqr->cpaddr == NULL) { | |
580 | kfree(cqr); | |
581 | return ERR_PTR(-ENOMEM); | |
582 | } | |
1da177e4 LT |
583 | } |
584 | cqr->data = NULL; | |
585 | if (datasize > 0) { | |
88abaab4 | 586 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 587 | if (cqr->data == NULL) { |
17fd682e | 588 | kfree(cqr->cpaddr); |
1da177e4 LT |
589 | kfree(cqr); |
590 | return ERR_PTR(-ENOMEM); | |
591 | } | |
1da177e4 LT |
592 | } |
593 | strncpy((char *) &cqr->magic, magic, 4); | |
594 | ASCEBC((char *) &cqr->magic, 4); | |
595 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
596 | dasd_get_device(device); | |
597 | return cqr; | |
598 | } | |
599 | ||
600 | struct dasd_ccw_req * | |
601 | dasd_smalloc_request(char *magic, int cplength, int datasize, | |
602 | struct dasd_device * device) | |
603 | { | |
604 | unsigned long flags; | |
605 | struct dasd_ccw_req *cqr; | |
606 | char *data; | |
607 | int size; | |
608 | ||
609 | /* Sanity checks */ | |
7ac1e877 ES |
610 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
611 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
612 | |
613 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
614 | if (cplength > 0) | |
615 | size += cplength * sizeof(struct ccw1); | |
616 | if (datasize > 0) | |
617 | size += datasize; | |
618 | spin_lock_irqsave(&device->mem_lock, flags); | |
619 | cqr = (struct dasd_ccw_req *) | |
620 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
621 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
622 | if (cqr == NULL) | |
623 | return ERR_PTR(-ENOMEM); | |
624 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
625 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
626 | cqr->cpaddr = NULL; | |
627 | if (cplength > 0) { | |
628 | cqr->cpaddr = (struct ccw1 *) data; | |
629 | data += cplength*sizeof(struct ccw1); | |
630 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
631 | } | |
632 | cqr->data = NULL; | |
633 | if (datasize > 0) { | |
634 | cqr->data = data; | |
635 | memset(cqr->data, 0, datasize); | |
636 | } | |
637 | strncpy((char *) &cqr->magic, magic, 4); | |
638 | ASCEBC((char *) &cqr->magic, 4); | |
639 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
640 | dasd_get_device(device); | |
641 | return cqr; | |
642 | } | |
643 | ||
644 | /* | |
645 | * Free memory of a channel program. This function needs to free all the | |
646 | * idal lists that might have been created by dasd_set_cda and the | |
647 | * struct dasd_ccw_req itself. | |
648 | */ | |
649 | void | |
650 | dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
651 | { | |
347a8dc3 | 652 | #ifdef CONFIG_64BIT |
1da177e4 LT |
653 | struct ccw1 *ccw; |
654 | ||
655 | /* Clear any idals used for the request. */ | |
656 | ccw = cqr->cpaddr; | |
657 | do { | |
658 | clear_normalized_cda(ccw); | |
659 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
660 | #endif | |
17fd682e JJ |
661 | kfree(cqr->cpaddr); |
662 | kfree(cqr->data); | |
1da177e4 LT |
663 | kfree(cqr); |
664 | dasd_put_device(device); | |
665 | } | |
666 | ||
667 | void | |
668 | dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
669 | { | |
670 | unsigned long flags; | |
671 | ||
672 | spin_lock_irqsave(&device->mem_lock, flags); | |
673 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
674 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
675 | dasd_put_device(device); | |
676 | } | |
677 | ||
678 | /* | |
679 | * Check discipline magic in cqr. | |
680 | */ | |
681 | static inline int | |
682 | dasd_check_cqr(struct dasd_ccw_req *cqr) | |
683 | { | |
684 | struct dasd_device *device; | |
685 | ||
686 | if (cqr == NULL) | |
687 | return -EINVAL; | |
688 | device = cqr->device; | |
689 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { | |
690 | DEV_MESSAGE(KERN_WARNING, device, | |
691 | " dasd_ccw_req 0x%08x magic doesn't match" | |
692 | " discipline 0x%08x", | |
693 | cqr->magic, | |
694 | *(unsigned int *) device->discipline->name); | |
695 | return -EINVAL; | |
696 | } | |
697 | return 0; | |
698 | } | |
699 | ||
700 | /* | |
701 | * Terminate the current i/o and set the request to clear_pending. | |
702 | * Timer keeps device runnig. | |
703 | * ccw_device_clear can fail if the i/o subsystem | |
704 | * is in a bad mood. | |
705 | */ | |
706 | int | |
707 | dasd_term_IO(struct dasd_ccw_req * cqr) | |
708 | { | |
709 | struct dasd_device *device; | |
710 | int retries, rc; | |
711 | ||
712 | /* Check the cqr */ | |
713 | rc = dasd_check_cqr(cqr); | |
714 | if (rc) | |
715 | return rc; | |
716 | retries = 0; | |
717 | device = (struct dasd_device *) cqr->device; | |
718 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { | |
719 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
720 | switch (rc) { | |
721 | case 0: /* termination successful */ | |
c2ba444d HH |
722 | cqr->retries--; |
723 | cqr->status = DASD_CQR_CLEAR; | |
1da177e4 | 724 | cqr->stopclk = get_clock(); |
8f61701b | 725 | cqr->starttime = 0; |
1da177e4 LT |
726 | DBF_DEV_EVENT(DBF_DEBUG, device, |
727 | "terminate cqr %p successful", | |
728 | cqr); | |
729 | break; | |
730 | case -ENODEV: | |
731 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
732 | "device gone, retry"); | |
733 | break; | |
734 | case -EIO: | |
735 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
736 | "I/O error, retry"); | |
737 | break; | |
738 | case -EINVAL: | |
739 | case -EBUSY: | |
740 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
741 | "device busy, retry later"); | |
742 | break; | |
743 | default: | |
744 | DEV_MESSAGE(KERN_ERR, device, | |
745 | "line %d unknown RC=%d, please " | |
746 | "report to linux390@de.ibm.com", | |
747 | __LINE__, rc); | |
748 | BUG(); | |
749 | break; | |
750 | } | |
751 | retries++; | |
752 | } | |
753 | dasd_schedule_bh(device); | |
754 | return rc; | |
755 | } | |
756 | ||
757 | /* | |
758 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
759 | * In that case set up a timer to start the request later. | |
760 | */ | |
761 | int | |
762 | dasd_start_IO(struct dasd_ccw_req * cqr) | |
763 | { | |
764 | struct dasd_device *device; | |
765 | int rc; | |
766 | ||
767 | /* Check the cqr */ | |
768 | rc = dasd_check_cqr(cqr); | |
769 | if (rc) | |
770 | return rc; | |
771 | device = (struct dasd_device *) cqr->device; | |
772 | if (cqr->retries < 0) { | |
773 | DEV_MESSAGE(KERN_DEBUG, device, | |
774 | "start_IO: request %p (%02x/%i) - no retry left.", | |
775 | cqr, cqr->status, cqr->retries); | |
776 | cqr->status = DASD_CQR_FAILED; | |
777 | return -EIO; | |
778 | } | |
779 | cqr->startclk = get_clock(); | |
780 | cqr->starttime = jiffies; | |
781 | cqr->retries--; | |
782 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
783 | cqr->lpm, 0); | |
784 | switch (rc) { | |
785 | case 0: | |
786 | cqr->status = DASD_CQR_IN_IO; | |
787 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
788 | "start_IO: request %p started successful", | |
789 | cqr); | |
790 | break; | |
791 | case -EBUSY: | |
792 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
793 | "start_IO: device busy, retry later"); | |
794 | break; | |
795 | case -ETIMEDOUT: | |
796 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
797 | "start_IO: request timeout, retry later"); | |
798 | break; | |
799 | case -EACCES: | |
800 | /* -EACCES indicates that the request used only a | |
801 | * subset of the available pathes and all these | |
802 | * pathes are gone. | |
803 | * Do a retry with all available pathes. | |
804 | */ | |
805 | cqr->lpm = LPM_ANYPATH; | |
806 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
807 | "start_IO: selected pathes gone," | |
808 | " retry on all pathes"); | |
809 | break; | |
810 | case -ENODEV: | |
811 | case -EIO: | |
812 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
813 | "start_IO: device gone, retry"); | |
814 | break; | |
815 | default: | |
816 | DEV_MESSAGE(KERN_ERR, device, | |
817 | "line %d unknown RC=%d, please report" | |
818 | " to linux390@de.ibm.com", __LINE__, rc); | |
819 | BUG(); | |
820 | break; | |
821 | } | |
822 | return rc; | |
823 | } | |
824 | ||
825 | /* | |
826 | * Timeout function for dasd devices. This is used for different purposes | |
827 | * 1) missing interrupt handler for normal operation | |
828 | * 2) delayed start of request where start_IO failed with -EBUSY | |
829 | * 3) timeout for missing state change interrupts | |
830 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
831 | * DASD_CQR_QUEUED for 2) and 3). | |
832 | */ | |
833 | static void | |
834 | dasd_timeout_device(unsigned long ptr) | |
835 | { | |
836 | unsigned long flags; | |
837 | struct dasd_device *device; | |
838 | ||
839 | device = (struct dasd_device *) ptr; | |
840 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
841 | /* re-activate request queue */ | |
842 | device->stopped &= ~DASD_STOPPED_PENDING; | |
843 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
844 | dasd_schedule_bh(device); | |
845 | } | |
846 | ||
847 | /* | |
848 | * Setup timeout for a device in jiffies. | |
849 | */ | |
850 | void | |
851 | dasd_set_timer(struct dasd_device *device, int expires) | |
852 | { | |
853 | if (expires == 0) { | |
854 | if (timer_pending(&device->timer)) | |
855 | del_timer(&device->timer); | |
856 | return; | |
857 | } | |
858 | if (timer_pending(&device->timer)) { | |
859 | if (mod_timer(&device->timer, jiffies + expires)) | |
860 | return; | |
861 | } | |
862 | device->timer.function = dasd_timeout_device; | |
863 | device->timer.data = (unsigned long) device; | |
864 | device->timer.expires = jiffies + expires; | |
865 | add_timer(&device->timer); | |
866 | } | |
867 | ||
868 | /* | |
869 | * Clear timeout for a device. | |
870 | */ | |
871 | void | |
872 | dasd_clear_timer(struct dasd_device *device) | |
873 | { | |
874 | if (timer_pending(&device->timer)) | |
875 | del_timer(&device->timer); | |
876 | } | |
877 | ||
878 | static void | |
879 | dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm) | |
880 | { | |
881 | struct dasd_ccw_req *cqr; | |
882 | struct dasd_device *device; | |
883 | ||
884 | cqr = (struct dasd_ccw_req *) intparm; | |
885 | if (cqr->status != DASD_CQR_IN_IO) { | |
886 | MESSAGE(KERN_DEBUG, | |
887 | "invalid status in handle_killed_request: " | |
888 | "bus_id %s, status %02x", | |
889 | cdev->dev.bus_id, cqr->status); | |
890 | return; | |
891 | } | |
892 | ||
893 | device = (struct dasd_device *) cqr->device; | |
894 | if (device == NULL || | |
a00bfd71 | 895 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 LT |
896 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
897 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
898 | cdev->dev.bus_id); | |
899 | return; | |
900 | } | |
901 | ||
902 | /* Schedule request to be retried. */ | |
903 | cqr->status = DASD_CQR_QUEUED; | |
904 | ||
905 | dasd_clear_timer(device); | |
906 | dasd_schedule_bh(device); | |
907 | dasd_put_device(device); | |
908 | } | |
909 | ||
910 | static void | |
911 | dasd_handle_state_change_pending(struct dasd_device *device) | |
912 | { | |
913 | struct dasd_ccw_req *cqr; | |
914 | struct list_head *l, *n; | |
915 | ||
20c64468 SW |
916 | /* First of all start sense subsystem status request. */ |
917 | dasd_eer_snss(device); | |
918 | ||
1da177e4 LT |
919 | device->stopped &= ~DASD_STOPPED_PENDING; |
920 | ||
921 | /* restart all 'running' IO on queue */ | |
922 | list_for_each_safe(l, n, &device->ccw_queue) { | |
923 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
924 | if (cqr->status == DASD_CQR_IN_IO) { | |
925 | cqr->status = DASD_CQR_QUEUED; | |
926 | } | |
927 | } | |
928 | dasd_clear_timer(device); | |
929 | dasd_schedule_bh(device); | |
930 | } | |
931 | ||
932 | /* | |
933 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
934 | */ | |
935 | void | |
936 | dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
937 | struct irb *irb) | |
938 | { | |
939 | struct dasd_ccw_req *cqr, *next; | |
940 | struct dasd_device *device; | |
941 | unsigned long long now; | |
942 | int expires; | |
943 | dasd_era_t era; | |
944 | char mask; | |
945 | ||
946 | if (IS_ERR(irb)) { | |
947 | switch (PTR_ERR(irb)) { | |
948 | case -EIO: | |
949 | dasd_handle_killed_request(cdev, intparm); | |
950 | break; | |
951 | case -ETIMEDOUT: | |
952 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
953 | __FUNCTION__, cdev->dev.bus_id); | |
954 | //FIXME - dasd uses own timeout interface... | |
955 | break; | |
956 | default: | |
957 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
958 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); | |
959 | } | |
960 | return; | |
961 | } | |
962 | ||
963 | now = get_clock(); | |
964 | ||
965 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
966 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), | |
967 | (unsigned int) intparm); | |
968 | ||
969 | /* first of all check for state change pending interrupt */ | |
970 | mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; | |
971 | if ((irb->scsw.dstat & mask) == mask) { | |
a00bfd71 | 972 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
973 | if (!IS_ERR(device)) { |
974 | dasd_handle_state_change_pending(device); | |
975 | dasd_put_device(device); | |
976 | } | |
977 | return; | |
978 | } | |
979 | ||
980 | cqr = (struct dasd_ccw_req *) intparm; | |
981 | ||
982 | /* check for unsolicited interrupts */ | |
983 | if (cqr == NULL) { | |
984 | MESSAGE(KERN_DEBUG, | |
985 | "unsolicited interrupt received: bus_id %s", | |
986 | cdev->dev.bus_id); | |
987 | return; | |
988 | } | |
989 | ||
990 | device = (struct dasd_device *) cqr->device; | |
991 | if (device == NULL || | |
992 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
993 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
994 | cdev->dev.bus_id); | |
995 | return; | |
996 | } | |
997 | ||
998 | /* Check for clear pending */ | |
999 | if (cqr->status == DASD_CQR_CLEAR && | |
1000 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { | |
1001 | cqr->status = DASD_CQR_QUEUED; | |
1002 | dasd_clear_timer(device); | |
8f61701b | 1003 | wake_up(&dasd_flush_wq); |
1da177e4 LT |
1004 | dasd_schedule_bh(device); |
1005 | return; | |
1006 | } | |
1007 | ||
1008 | /* check status - the request might have been killed by dyn detach */ | |
1009 | if (cqr->status != DASD_CQR_IN_IO) { | |
1010 | MESSAGE(KERN_DEBUG, | |
1011 | "invalid status: bus_id %s, status %02x", | |
1012 | cdev->dev.bus_id, cqr->status); | |
1013 | return; | |
1014 | } | |
1015 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
1016 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); | |
1017 | ||
1018 | /* Find out the appropriate era_action. */ | |
138c014d | 1019 | if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) |
1da177e4 LT |
1020 | era = dasd_era_fatal; |
1021 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
1022 | irb->scsw.cstat == 0 && | |
1023 | !irb->esw.esw0.erw.cons) | |
1024 | era = dasd_era_none; | |
1da177e4 LT |
1025 | else if (irb->esw.esw0.erw.cons) |
1026 | era = device->discipline->examine_error(cqr, irb); | |
138c014d | 1027 | else |
1da177e4 LT |
1028 | era = dasd_era_recover; |
1029 | ||
1030 | DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); | |
1031 | expires = 0; | |
1032 | if (era == dasd_era_none) { | |
1033 | cqr->status = DASD_CQR_DONE; | |
1034 | cqr->stopclk = now; | |
1035 | /* Start first request on queue if possible -> fast_io. */ | |
1036 | if (cqr->list.next != &device->ccw_queue) { | |
1037 | next = list_entry(cqr->list.next, | |
1038 | struct dasd_ccw_req, list); | |
1039 | if ((next->status == DASD_CQR_QUEUED) && | |
1040 | (!device->stopped)) { | |
1041 | if (device->discipline->start_IO(next) == 0) | |
1042 | expires = next->expires; | |
1043 | else | |
1044 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1045 | "Interrupt fastpath " | |
1046 | "failed!"); | |
1047 | } | |
1048 | } | |
1049 | } else { /* error */ | |
1050 | memcpy(&cqr->irb, irb, sizeof (struct irb)); | |
9575bf26 HH |
1051 | if (device->features & DASD_FEATURE_ERPLOG) { |
1052 | /* dump sense data */ | |
1053 | dasd_log_sense(cqr, irb); | |
1054 | } | |
1da177e4 LT |
1055 | switch (era) { |
1056 | case dasd_era_fatal: | |
1057 | cqr->status = DASD_CQR_FAILED; | |
1058 | cqr->stopclk = now; | |
1059 | break; | |
1060 | case dasd_era_recover: | |
1061 | cqr->status = DASD_CQR_ERROR; | |
1062 | break; | |
1063 | default: | |
1064 | BUG(); | |
1065 | } | |
1066 | } | |
1067 | if (expires != 0) | |
1068 | dasd_set_timer(device, expires); | |
1069 | else | |
1070 | dasd_clear_timer(device); | |
1071 | dasd_schedule_bh(device); | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * posts the buffer_cache about a finalized request | |
1076 | */ | |
1077 | static inline void | |
1078 | dasd_end_request(struct request *req, int uptodate) | |
1079 | { | |
1080 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) | |
1081 | BUG(); | |
1082 | add_disk_randomness(req->rq_disk); | |
8ffdc655 | 1083 | end_that_request_last(req, uptodate); |
1da177e4 LT |
1084 | } |
1085 | ||
1086 | /* | |
1087 | * Process finished error recovery ccw. | |
1088 | */ | |
1089 | static inline void | |
1090 | __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr) | |
1091 | { | |
1092 | dasd_erp_fn_t erp_fn; | |
1093 | ||
1094 | if (cqr->status == DASD_CQR_DONE) | |
1095 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1096 | else | |
1097 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1098 | erp_fn = device->discipline->erp_postaction(cqr); | |
1099 | erp_fn(cqr); | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Process ccw request queue. | |
1104 | */ | |
4d284cac | 1105 | static void |
1da177e4 LT |
1106 | __dasd_process_ccw_queue(struct dasd_device * device, |
1107 | struct list_head *final_queue) | |
1108 | { | |
1109 | struct list_head *l, *n; | |
1110 | struct dasd_ccw_req *cqr; | |
1111 | dasd_erp_fn_t erp_fn; | |
1112 | ||
1113 | restart: | |
1114 | /* Process request with final status. */ | |
1115 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1116 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1117 | /* Stop list processing at the first non-final request. */ | |
1118 | if (cqr->status != DASD_CQR_DONE && | |
1119 | cqr->status != DASD_CQR_FAILED && | |
1120 | cqr->status != DASD_CQR_ERROR) | |
1121 | break; | |
1122 | /* Process requests with DASD_CQR_ERROR */ | |
1123 | if (cqr->status == DASD_CQR_ERROR) { | |
1124 | if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) { | |
1125 | cqr->status = DASD_CQR_FAILED; | |
1126 | cqr->stopclk = get_clock(); | |
1127 | } else { | |
336c340b HH |
1128 | if (cqr->irb.esw.esw0.erw.cons && |
1129 | test_bit(DASD_CQR_FLAGS_USE_ERP, | |
1130 | &cqr->flags)) { | |
1da177e4 LT |
1131 | erp_fn = device->discipline-> |
1132 | erp_action(cqr); | |
1133 | erp_fn(cqr); | |
1134 | } else | |
1135 | dasd_default_erp_action(cqr); | |
1136 | } | |
1137 | goto restart; | |
1138 | } | |
20c64468 SW |
1139 | |
1140 | /* First of all call extended error reporting. */ | |
1141 | if (dasd_eer_enabled(device) && | |
1142 | cqr->status == DASD_CQR_FAILED) { | |
1143 | dasd_eer_write(device, cqr, DASD_EER_FATALERROR); | |
1144 | ||
1145 | /* restart request */ | |
1146 | cqr->status = DASD_CQR_QUEUED; | |
1147 | cqr->retries = 255; | |
1148 | device->stopped |= DASD_STOPPED_QUIESCE; | |
1149 | goto restart; | |
1150 | } | |
1151 | ||
1da177e4 LT |
1152 | /* Process finished ERP request. */ |
1153 | if (cqr->refers) { | |
1154 | __dasd_process_erp(device, cqr); | |
1155 | goto restart; | |
1156 | } | |
1157 | ||
1158 | /* Rechain finished requests to final queue */ | |
1159 | cqr->endclk = get_clock(); | |
1160 | list_move_tail(&cqr->list, final_queue); | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | static void | |
1165 | dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data) | |
1166 | { | |
1167 | struct request *req; | |
1168 | struct dasd_device *device; | |
1169 | int status; | |
1170 | ||
1171 | req = (struct request *) data; | |
1172 | device = cqr->device; | |
1173 | dasd_profile_end(device, cqr, req); | |
1174 | status = cqr->device->discipline->free_cp(cqr,req); | |
1175 | spin_lock_irq(&device->request_queue_lock); | |
1176 | dasd_end_request(req, status); | |
1177 | spin_unlock_irq(&device->request_queue_lock); | |
1178 | } | |
1179 | ||
1180 | ||
1181 | /* | |
1182 | * Fetch requests from the block device queue. | |
1183 | */ | |
4d284cac | 1184 | static void |
1da177e4 LT |
1185 | __dasd_process_blk_queue(struct dasd_device * device) |
1186 | { | |
1187 | request_queue_t *queue; | |
1188 | struct request *req; | |
1189 | struct dasd_ccw_req *cqr; | |
c6eb7b77 | 1190 | int nr_queued; |
1da177e4 LT |
1191 | |
1192 | queue = device->request_queue; | |
1193 | /* No queue ? Then there is nothing to do. */ | |
1194 | if (queue == NULL) | |
1195 | return; | |
1196 | ||
1197 | /* | |
1198 | * We requeue request from the block device queue to the ccw | |
1199 | * queue only in two states. In state DASD_STATE_READY the | |
1200 | * partition detection is done and we need to requeue requests | |
1201 | * for that. State DASD_STATE_ONLINE is normal block device | |
1202 | * operation. | |
1203 | */ | |
1204 | if (device->state != DASD_STATE_READY && | |
1205 | device->state != DASD_STATE_ONLINE) | |
1206 | return; | |
1207 | nr_queued = 0; | |
1208 | /* Now we try to fetch requests from the request queue */ | |
1209 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1210 | if (cqr->status == DASD_CQR_QUEUED) | |
1211 | nr_queued++; | |
1212 | while (!blk_queue_plugged(queue) && | |
1213 | elv_next_request(queue) && | |
1214 | nr_queued < DASD_CHANQ_MAX_SIZE) { | |
1215 | req = elv_next_request(queue); | |
f24acd45 | 1216 | |
c6eb7b77 HH |
1217 | if (device->features & DASD_FEATURE_READONLY && |
1218 | rq_data_dir(req) == WRITE) { | |
1da177e4 LT |
1219 | DBF_DEV_EVENT(DBF_ERR, device, |
1220 | "Rejecting write request %p", | |
1221 | req); | |
1222 | blkdev_dequeue_request(req); | |
1223 | dasd_end_request(req, 0); | |
1224 | continue; | |
1225 | } | |
1226 | if (device->stopped & DASD_STOPPED_DC_EIO) { | |
1227 | blkdev_dequeue_request(req); | |
1228 | dasd_end_request(req, 0); | |
1229 | continue; | |
1230 | } | |
1231 | cqr = device->discipline->build_cp(device, req); | |
1232 | if (IS_ERR(cqr)) { | |
1233 | if (PTR_ERR(cqr) == -ENOMEM) | |
1234 | break; /* terminate request queue loop */ | |
d54853ef MS |
1235 | if (PTR_ERR(cqr) == -EAGAIN) { |
1236 | /* | |
1237 | * The current request cannot be build right | |
1238 | * now, we have to try later. If this request | |
1239 | * is the head-of-queue we stop the device | |
1240 | * for 1/2 second. | |
1241 | */ | |
1242 | if (!list_empty(&device->ccw_queue)) | |
1243 | break; | |
1244 | device->stopped |= DASD_STOPPED_PENDING; | |
1245 | dasd_set_timer(device, HZ/2); | |
1246 | break; | |
1247 | } | |
1da177e4 LT |
1248 | DBF_DEV_EVENT(DBF_ERR, device, |
1249 | "CCW creation failed (rc=%ld) " | |
1250 | "on request %p", | |
1251 | PTR_ERR(cqr), req); | |
1252 | blkdev_dequeue_request(req); | |
1253 | dasd_end_request(req, 0); | |
1254 | continue; | |
1255 | } | |
1256 | cqr->callback = dasd_end_request_cb; | |
1257 | cqr->callback_data = (void *) req; | |
1258 | cqr->status = DASD_CQR_QUEUED; | |
1259 | blkdev_dequeue_request(req); | |
1260 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1261 | dasd_profile_start(device, cqr, req); | |
1262 | nr_queued++; | |
1263 | } | |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * Take a look at the first request on the ccw queue and check | |
1268 | * if it reached its expire time. If so, terminate the IO. | |
1269 | */ | |
4d284cac | 1270 | static void |
1da177e4 LT |
1271 | __dasd_check_expire(struct dasd_device * device) |
1272 | { | |
1273 | struct dasd_ccw_req *cqr; | |
1274 | ||
1275 | if (list_empty(&device->ccw_queue)) | |
1276 | return; | |
1277 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
29145a6c HH |
1278 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1279 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1280 | if (device->discipline->term_IO(cqr) != 0) { | |
1281 | /* Hmpf, try again in 5 sec */ | |
1282 | dasd_set_timer(device, 5*HZ); | |
1283 | DEV_MESSAGE(KERN_ERR, device, | |
1284 | "internal error - timeout (%is) expired " | |
1285 | "for cqr %p, termination failed, " | |
1286 | "retrying in 5s", | |
1287 | (cqr->expires/HZ), cqr); | |
1288 | } else { | |
8f61701b HH |
1289 | DEV_MESSAGE(KERN_ERR, device, |
1290 | "internal error - timeout (%is) expired " | |
1291 | "for cqr %p (%i retries left)", | |
1292 | (cqr->expires/HZ), cqr, cqr->retries); | |
1da177e4 LT |
1293 | } |
1294 | } | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Take a look at the first request on the ccw queue and check | |
1299 | * if it needs to be started. | |
1300 | */ | |
4d284cac | 1301 | static void |
1da177e4 LT |
1302 | __dasd_start_head(struct dasd_device * device) |
1303 | { | |
1304 | struct dasd_ccw_req *cqr; | |
1305 | int rc; | |
1306 | ||
1307 | if (list_empty(&device->ccw_queue)) | |
1308 | return; | |
1309 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
25ee4cf8 PO |
1310 | if (cqr->status != DASD_CQR_QUEUED) |
1311 | return; | |
1312 | /* Non-temporary stop condition will trigger fail fast */ | |
1c01b8a5 | 1313 | if (device->stopped & ~DASD_STOPPED_PENDING && |
20c64468 SW |
1314 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
1315 | (!dasd_eer_enabled(device))) { | |
1c01b8a5 HH |
1316 | cqr->status = DASD_CQR_FAILED; |
1317 | dasd_schedule_bh(device); | |
25ee4cf8 | 1318 | return; |
1c01b8a5 | 1319 | } |
25ee4cf8 PO |
1320 | /* Don't try to start requests if device is stopped */ |
1321 | if (device->stopped) | |
1322 | return; | |
1323 | ||
1324 | rc = device->discipline->start_IO(cqr); | |
1325 | if (rc == 0) | |
1326 | dasd_set_timer(device, cqr->expires); | |
1327 | else if (rc == -EACCES) { | |
1328 | dasd_schedule_bh(device); | |
1329 | } else | |
1330 | /* Hmpf, try again in 1/2 sec */ | |
1331 | dasd_set_timer(device, 50); | |
1da177e4 LT |
1332 | } |
1333 | ||
8f61701b HH |
1334 | static inline int |
1335 | _wait_for_clear(struct dasd_ccw_req *cqr) | |
1336 | { | |
1337 | return (cqr->status == DASD_CQR_QUEUED); | |
1338 | } | |
1339 | ||
1da177e4 | 1340 | /* |
8f61701b HH |
1341 | * Remove all requests from the ccw queue (all = '1') or only block device |
1342 | * requests in case all = '0'. | |
1343 | * Take care of the erp-chain (chained via cqr->refers) and remove either | |
1344 | * the whole erp-chain or none of the erp-requests. | |
1345 | * If a request is currently running, term_IO is called and the request | |
1346 | * is re-queued. Prior to removing the terminated request we need to wait | |
1347 | * for the clear-interrupt. | |
1348 | * In case termination is not possible we stop processing and just finishing | |
1349 | * the already moved requests. | |
1da177e4 | 1350 | */ |
8f61701b | 1351 | static int |
1da177e4 LT |
1352 | dasd_flush_ccw_queue(struct dasd_device * device, int all) |
1353 | { | |
8f61701b HH |
1354 | struct dasd_ccw_req *cqr, *orig, *n; |
1355 | int rc, i; | |
1356 | ||
1da177e4 | 1357 | struct list_head flush_queue; |
1da177e4 LT |
1358 | |
1359 | INIT_LIST_HEAD(&flush_queue); | |
1360 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b HH |
1361 | rc = 0; |
1362 | restart: | |
1363 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, list) { | |
1364 | /* get original request of erp request-chain */ | |
1365 | for (orig = cqr; orig->refers != NULL; orig = orig->refers); | |
1366 | ||
1da177e4 | 1367 | /* Flush all request or only block device requests? */ |
8f61701b HH |
1368 | if (all == 0 && cqr->callback != dasd_end_request_cb && |
1369 | orig->callback != dasd_end_request_cb) { | |
1da177e4 | 1370 | continue; |
8f61701b HH |
1371 | } |
1372 | /* Check status and move request to flush_queue */ | |
1373 | switch (cqr->status) { | |
1374 | case DASD_CQR_IN_IO: | |
1375 | rc = device->discipline->term_IO(cqr); | |
1376 | if (rc) { | |
1377 | /* unable to terminate requeust */ | |
1378 | DEV_MESSAGE(KERN_ERR, device, | |
1379 | "dasd flush ccw_queue is unable " | |
1380 | " to terminate request %p", | |
1381 | cqr); | |
1382 | /* stop flush processing */ | |
1383 | goto finished; | |
1384 | } | |
1385 | break; | |
1386 | case DASD_CQR_QUEUED: | |
1387 | case DASD_CQR_ERROR: | |
1388 | /* set request to FAILED */ | |
1da177e4 | 1389 | cqr->stopclk = get_clock(); |
8f61701b HH |
1390 | cqr->status = DASD_CQR_FAILED; |
1391 | break; | |
1392 | default: /* do not touch the others */ | |
1393 | break; | |
1394 | } | |
1395 | /* Rechain request (including erp chain) */ | |
1396 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) { | |
1397 | cqr->endclk = get_clock(); | |
1398 | list_move_tail(&cqr->list, &flush_queue); | |
1399 | } | |
1400 | if (i > 1) | |
1401 | /* moved more than one request - need to restart */ | |
1402 | goto restart; | |
1403 | } | |
1404 | ||
1405 | finished: | |
1406 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1407 | /* Now call the callback function of flushed requests */ | |
1408 | restart_cb: | |
1409 | list_for_each_entry_safe(cqr, n, &flush_queue, list) { | |
1410 | if (cqr->status == DASD_CQR_CLEAR) { | |
1411 | /* wait for clear interrupt! */ | |
1412 | wait_event(dasd_flush_wq, _wait_for_clear(cqr)); | |
1413 | cqr->status = DASD_CQR_FAILED; | |
1da177e4 LT |
1414 | } |
1415 | /* Process finished ERP request. */ | |
1416 | if (cqr->refers) { | |
1417 | __dasd_process_erp(device, cqr); | |
8f61701b HH |
1418 | /* restart list_for_xx loop since dasd_process_erp |
1419 | * might remove multiple elements */ | |
1420 | goto restart_cb; | |
1da177e4 | 1421 | } |
8f61701b | 1422 | /* call the callback function */ |
1da177e4 | 1423 | cqr->endclk = get_clock(); |
1da177e4 LT |
1424 | if (cqr->callback != NULL) |
1425 | (cqr->callback)(cqr, cqr->callback_data); | |
1426 | } | |
8f61701b | 1427 | return rc; |
1da177e4 LT |
1428 | } |
1429 | ||
1430 | /* | |
1431 | * Acquire the device lock and process queues for the device. | |
1432 | */ | |
1433 | static void | |
1434 | dasd_tasklet(struct dasd_device * device) | |
1435 | { | |
1436 | struct list_head final_queue; | |
1437 | struct list_head *l, *n; | |
1438 | struct dasd_ccw_req *cqr; | |
1439 | ||
1440 | atomic_set (&device->tasklet_scheduled, 0); | |
1441 | INIT_LIST_HEAD(&final_queue); | |
1442 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1443 | /* Check expire time of first request on the ccw queue. */ | |
1444 | __dasd_check_expire(device); | |
1445 | /* Finish off requests on ccw queue */ | |
1446 | __dasd_process_ccw_queue(device, &final_queue); | |
1447 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1448 | /* Now call the callback function of requests with final status */ | |
1449 | list_for_each_safe(l, n, &final_queue) { | |
1450 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
c2ba444d | 1451 | list_del_init(&cqr->list); |
1da177e4 LT |
1452 | if (cqr->callback != NULL) |
1453 | (cqr->callback)(cqr, cqr->callback_data); | |
1454 | } | |
1455 | spin_lock_irq(&device->request_queue_lock); | |
1456 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1457 | /* Get new request from the block device request queue */ | |
1458 | __dasd_process_blk_queue(device); | |
1459 | /* Now check if the head of the ccw queue needs to be started. */ | |
1460 | __dasd_start_head(device); | |
1461 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1462 | spin_unlock_irq(&device->request_queue_lock); | |
1463 | dasd_put_device(device); | |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1468 | */ | |
1469 | void | |
1470 | dasd_schedule_bh(struct dasd_device * device) | |
1471 | { | |
1472 | /* Protect against rescheduling. */ | |
973bd993 | 1473 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1474 | return; |
1475 | dasd_get_device(device); | |
1476 | tasklet_hi_schedule(&device->tasklet); | |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Queue a request to the head of the ccw_queue. Start the I/O if | |
1481 | * possible. | |
1482 | */ | |
1483 | void | |
1484 | dasd_add_request_head(struct dasd_ccw_req *req) | |
1485 | { | |
1486 | struct dasd_device *device; | |
1487 | unsigned long flags; | |
1488 | ||
1489 | device = req->device; | |
1490 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1491 | req->status = DASD_CQR_QUEUED; | |
1492 | req->device = device; | |
1493 | list_add(&req->list, &device->ccw_queue); | |
1494 | /* let the bh start the request to keep them in order */ | |
1495 | dasd_schedule_bh(device); | |
1496 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * Queue a request to the tail of the ccw_queue. Start the I/O if | |
1501 | * possible. | |
1502 | */ | |
1503 | void | |
1504 | dasd_add_request_tail(struct dasd_ccw_req *req) | |
1505 | { | |
1506 | struct dasd_device *device; | |
1507 | unsigned long flags; | |
1508 | ||
1509 | device = req->device; | |
1510 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1511 | req->status = DASD_CQR_QUEUED; | |
1512 | req->device = device; | |
1513 | list_add_tail(&req->list, &device->ccw_queue); | |
1514 | /* let the bh start the request to keep them in order */ | |
1515 | dasd_schedule_bh(device); | |
1516 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1517 | } | |
1518 | ||
1519 | /* | |
1520 | * Wakeup callback. | |
1521 | */ | |
1522 | static void | |
1523 | dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) | |
1524 | { | |
1525 | wake_up((wait_queue_head_t *) data); | |
1526 | } | |
1527 | ||
1528 | static inline int | |
1529 | _wait_for_wakeup(struct dasd_ccw_req *cqr) | |
1530 | { | |
1531 | struct dasd_device *device; | |
1532 | int rc; | |
1533 | ||
1534 | device = cqr->device; | |
1535 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1536 | rc = ((cqr->status == DASD_CQR_DONE || |
1537 | cqr->status == DASD_CQR_FAILED) && | |
1538 | list_empty(&cqr->list)); | |
1da177e4 LT |
1539 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1540 | return rc; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Attempts to start a special ccw queue and waits for its completion. | |
1545 | */ | |
1546 | int | |
1547 | dasd_sleep_on(struct dasd_ccw_req * cqr) | |
1548 | { | |
1549 | wait_queue_head_t wait_q; | |
1550 | struct dasd_device *device; | |
1551 | int rc; | |
138c014d | 1552 | |
1da177e4 LT |
1553 | device = cqr->device; |
1554 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
138c014d | 1555 | |
1da177e4 LT |
1556 | init_waitqueue_head (&wait_q); |
1557 | cqr->callback = dasd_wakeup_cb; | |
1558 | cqr->callback_data = (void *) &wait_q; | |
1559 | cqr->status = DASD_CQR_QUEUED; | |
1560 | list_add_tail(&cqr->list, &device->ccw_queue); | |
138c014d | 1561 | |
1da177e4 LT |
1562 | /* let the bh start the request to keep them in order */ |
1563 | dasd_schedule_bh(device); | |
138c014d | 1564 | |
1da177e4 LT |
1565 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1566 | ||
1567 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1568 | |
1da177e4 LT |
1569 | /* Request status is either done or failed. */ |
1570 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1571 | return rc; | |
1572 | } | |
1573 | ||
1574 | /* | |
1575 | * Attempts to start a special ccw queue and wait interruptible | |
1576 | * for its completion. | |
1577 | */ | |
1578 | int | |
1579 | dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) | |
1580 | { | |
1581 | wait_queue_head_t wait_q; | |
1582 | struct dasd_device *device; | |
1583 | int rc, finished; | |
1584 | ||
1585 | device = cqr->device; | |
1586 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1587 | ||
1588 | init_waitqueue_head (&wait_q); | |
1589 | cqr->callback = dasd_wakeup_cb; | |
1590 | cqr->callback_data = (void *) &wait_q; | |
1591 | cqr->status = DASD_CQR_QUEUED; | |
1592 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1593 | ||
1594 | /* let the bh start the request to keep them in order */ | |
1595 | dasd_schedule_bh(device); | |
1596 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1597 | ||
1598 | finished = 0; | |
1599 | while (!finished) { | |
1600 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); | |
1601 | if (rc != -ERESTARTSYS) { | |
c2ba444d HH |
1602 | /* Request is final (done or failed) */ |
1603 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1da177e4 LT |
1604 | break; |
1605 | } | |
1606 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1607 | switch (cqr->status) { |
1608 | case DASD_CQR_IN_IO: | |
1609 | /* terminate runnig cqr */ | |
1610 | if (device->discipline->term_IO) { | |
1611 | cqr->retries = -1; | |
1612 | device->discipline->term_IO(cqr); | |
8f61701b HH |
1613 | /* wait (non-interruptible) for final status |
1614 | * because signal ist still pending */ | |
c2ba444d HH |
1615 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1616 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1617 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1618 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1619 | finished = 1; | |
1620 | } | |
1621 | break; | |
1622 | case DASD_CQR_QUEUED: | |
1623 | /* request */ | |
1624 | list_del_init(&cqr->list); | |
1625 | rc = -EIO; | |
1da177e4 | 1626 | finished = 1; |
c2ba444d HH |
1627 | break; |
1628 | default: | |
1629 | /* cqr with 'non-interruptable' status - just wait */ | |
1630 | break; | |
1da177e4 LT |
1631 | } |
1632 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1633 | } | |
1634 | return rc; | |
1635 | } | |
1636 | ||
1637 | /* | |
1638 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1639 | * for eckd devices) the currently running request has to be terminated | |
1640 | * and be put back to status queued, before the special request is added | |
1641 | * to the head of the queue. Then the special request is waited on normally. | |
1642 | */ | |
1643 | static inline int | |
1644 | _dasd_term_running_cqr(struct dasd_device *device) | |
1645 | { | |
1646 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1647 | |
1648 | if (list_empty(&device->ccw_queue)) | |
1649 | return 0; | |
1650 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
8f61701b | 1651 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1652 | } |
1653 | ||
1654 | int | |
1655 | dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) | |
1656 | { | |
1657 | wait_queue_head_t wait_q; | |
1658 | struct dasd_device *device; | |
1659 | int rc; | |
138c014d | 1660 | |
1da177e4 LT |
1661 | device = cqr->device; |
1662 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1663 | rc = _dasd_term_running_cqr(device); | |
1664 | if (rc) { | |
1665 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1666 | return rc; | |
1667 | } | |
138c014d | 1668 | |
1da177e4 LT |
1669 | init_waitqueue_head (&wait_q); |
1670 | cqr->callback = dasd_wakeup_cb; | |
1671 | cqr->callback_data = (void *) &wait_q; | |
1672 | cqr->status = DASD_CQR_QUEUED; | |
1673 | list_add(&cqr->list, &device->ccw_queue); | |
138c014d | 1674 | |
1da177e4 LT |
1675 | /* let the bh start the request to keep them in order */ |
1676 | dasd_schedule_bh(device); | |
138c014d | 1677 | |
1da177e4 LT |
1678 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1679 | ||
1680 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1681 | |
1da177e4 LT |
1682 | /* Request status is either done or failed. */ |
1683 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1684 | return rc; | |
1685 | } | |
1686 | ||
1687 | /* | |
1688 | * Cancels a request that was started with dasd_sleep_on_req. | |
1689 | * This is useful to timeout requests. The request will be | |
1690 | * terminated if it is currently in i/o. | |
1691 | * Returns 1 if the request has been terminated. | |
1692 | */ | |
1693 | int | |
1694 | dasd_cancel_req(struct dasd_ccw_req *cqr) | |
1695 | { | |
1696 | struct dasd_device *device = cqr->device; | |
1697 | unsigned long flags; | |
1698 | int rc; | |
1699 | ||
1700 | rc = 0; | |
1701 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1702 | switch (cqr->status) { | |
1703 | case DASD_CQR_QUEUED: | |
1704 | /* request was not started - just set to failed */ | |
1705 | cqr->status = DASD_CQR_FAILED; | |
1706 | break; | |
1707 | case DASD_CQR_IN_IO: | |
1708 | /* request in IO - terminate IO and release again */ | |
1709 | if (device->discipline->term_IO(cqr) != 0) | |
1710 | /* what to do if unable to terminate ?????? | |
1711 | e.g. not _IN_IO */ | |
1712 | cqr->status = DASD_CQR_FAILED; | |
1713 | cqr->stopclk = get_clock(); | |
1714 | rc = 1; | |
1715 | break; | |
1716 | case DASD_CQR_DONE: | |
1717 | case DASD_CQR_FAILED: | |
1718 | /* already finished - do nothing */ | |
1719 | break; | |
1720 | default: | |
1721 | DEV_MESSAGE(KERN_ALERT, device, | |
1722 | "invalid status %02x in request", | |
1723 | cqr->status); | |
1724 | BUG(); | |
1725 | ||
1726 | } | |
1727 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1728 | dasd_schedule_bh(device); | |
1729 | return rc; | |
1730 | } | |
1731 | ||
1732 | /* | |
1733 | * SECTION: Block device operations (request queue, partitions, open, release). | |
1734 | */ | |
1735 | ||
1736 | /* | |
1737 | * Dasd request queue function. Called from ll_rw_blk.c | |
1738 | */ | |
1739 | static void | |
1740 | do_dasd_request(request_queue_t * queue) | |
1741 | { | |
1742 | struct dasd_device *device; | |
1743 | ||
1744 | device = (struct dasd_device *) queue->queuedata; | |
1745 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1746 | /* Get new request from the block device request queue */ | |
1747 | __dasd_process_blk_queue(device); | |
1748 | /* Now check if the head of the ccw queue needs to be started. */ | |
1749 | __dasd_start_head(device); | |
1750 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1751 | } | |
1752 | ||
1753 | /* | |
1754 | * Allocate and initialize request queue and default I/O scheduler. | |
1755 | */ | |
1756 | static int | |
1757 | dasd_alloc_queue(struct dasd_device * device) | |
1758 | { | |
1759 | int rc; | |
1760 | ||
1761 | device->request_queue = blk_init_queue(do_dasd_request, | |
1762 | &device->request_queue_lock); | |
1763 | if (device->request_queue == NULL) | |
1764 | return -ENOMEM; | |
1765 | ||
1766 | device->request_queue->queuedata = device; | |
1767 | ||
1768 | elevator_exit(device->request_queue->elevator); | |
1769 | rc = elevator_init(device->request_queue, "deadline"); | |
1770 | if (rc) { | |
1771 | blk_cleanup_queue(device->request_queue); | |
1772 | return rc; | |
1773 | } | |
1774 | return 0; | |
1775 | } | |
1776 | ||
1777 | /* | |
1778 | * Allocate and initialize request queue. | |
1779 | */ | |
1780 | static void | |
1781 | dasd_setup_queue(struct dasd_device * device) | |
1782 | { | |
1783 | int max; | |
1784 | ||
1785 | blk_queue_hardsect_size(device->request_queue, device->bp_block); | |
1786 | max = device->discipline->max_blocks << device->s2b_shift; | |
1787 | blk_queue_max_sectors(device->request_queue, max); | |
1788 | blk_queue_max_phys_segments(device->request_queue, -1L); | |
1789 | blk_queue_max_hw_segments(device->request_queue, -1L); | |
1790 | blk_queue_max_segment_size(device->request_queue, -1L); | |
1791 | blk_queue_segment_boundary(device->request_queue, -1L); | |
ed68cb36 | 1792 | blk_queue_ordered(device->request_queue, QUEUE_ORDERED_TAG, NULL); |
1da177e4 LT |
1793 | } |
1794 | ||
1795 | /* | |
1796 | * Deactivate and free request queue. | |
1797 | */ | |
1798 | static void | |
1799 | dasd_free_queue(struct dasd_device * device) | |
1800 | { | |
1801 | if (device->request_queue) { | |
1802 | blk_cleanup_queue(device->request_queue); | |
1803 | device->request_queue = NULL; | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | /* | |
1808 | * Flush request on the request queue. | |
1809 | */ | |
1810 | static void | |
1811 | dasd_flush_request_queue(struct dasd_device * device) | |
1812 | { | |
1813 | struct request *req; | |
1814 | ||
1815 | if (!device->request_queue) | |
1816 | return; | |
138c014d | 1817 | |
1da177e4 | 1818 | spin_lock_irq(&device->request_queue_lock); |
8f61701b | 1819 | while ((req = elv_next_request(device->request_queue))) { |
1da177e4 | 1820 | blkdev_dequeue_request(req); |
ebc45999 | 1821 | dasd_end_request(req, 0); |
1da177e4 LT |
1822 | } |
1823 | spin_unlock_irq(&device->request_queue_lock); | |
1824 | } | |
1825 | ||
1826 | static int | |
1827 | dasd_open(struct inode *inp, struct file *filp) | |
1828 | { | |
1829 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1830 | struct dasd_device *device = disk->private_data; | |
1831 | int rc; | |
1832 | ||
1833 | atomic_inc(&device->open_count); | |
1834 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1835 | rc = -ENODEV; | |
1836 | goto unlock; | |
1837 | } | |
1838 | ||
1839 | if (!try_module_get(device->discipline->owner)) { | |
1840 | rc = -EINVAL; | |
1841 | goto unlock; | |
1842 | } | |
1843 | ||
1844 | if (dasd_probeonly) { | |
1845 | DEV_MESSAGE(KERN_INFO, device, "%s", | |
1846 | "No access to device due to probeonly mode"); | |
1847 | rc = -EPERM; | |
1848 | goto out; | |
1849 | } | |
1850 | ||
90f0094d | 1851 | if (device->state <= DASD_STATE_BASIC) { |
1da177e4 LT |
1852 | DBF_DEV_EVENT(DBF_ERR, device, " %s", |
1853 | " Cannot open unrecognized device"); | |
1854 | rc = -ENODEV; | |
1855 | goto out; | |
1856 | } | |
1857 | ||
1858 | return 0; | |
1859 | ||
1860 | out: | |
1861 | module_put(device->discipline->owner); | |
1862 | unlock: | |
1863 | atomic_dec(&device->open_count); | |
1864 | return rc; | |
1865 | } | |
1866 | ||
1867 | static int | |
1868 | dasd_release(struct inode *inp, struct file *filp) | |
1869 | { | |
1870 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1871 | struct dasd_device *device = disk->private_data; | |
1872 | ||
1873 | atomic_dec(&device->open_count); | |
1874 | module_put(device->discipline->owner); | |
1875 | return 0; | |
1876 | } | |
1877 | ||
a885c8c4 CH |
1878 | /* |
1879 | * Return disk geometry. | |
1880 | */ | |
1881 | static int | |
1882 | dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1883 | { | |
1884 | struct dasd_device *device; | |
1885 | ||
1886 | device = bdev->bd_disk->private_data; | |
1887 | if (!device) | |
1888 | return -ENODEV; | |
1889 | ||
1890 | if (!device->discipline || | |
1891 | !device->discipline->fill_geometry) | |
1892 | return -EINVAL; | |
1893 | ||
1894 | device->discipline->fill_geometry(device, geo); | |
1895 | geo->start = get_start_sect(bdev) >> device->s2b_shift; | |
1896 | return 0; | |
1897 | } | |
1898 | ||
1da177e4 LT |
1899 | struct block_device_operations |
1900 | dasd_device_operations = { | |
1901 | .owner = THIS_MODULE, | |
1902 | .open = dasd_open, | |
1903 | .release = dasd_release, | |
1904 | .ioctl = dasd_ioctl, | |
8262037f | 1905 | .compat_ioctl = dasd_compat_ioctl, |
a885c8c4 | 1906 | .getgeo = dasd_getgeo, |
1da177e4 LT |
1907 | }; |
1908 | ||
1909 | ||
1910 | static void | |
1911 | dasd_exit(void) | |
1912 | { | |
1913 | #ifdef CONFIG_PROC_FS | |
1914 | dasd_proc_exit(); | |
1915 | #endif | |
20c64468 | 1916 | dasd_eer_exit(); |
6bb0e010 HH |
1917 | if (dasd_page_cache != NULL) { |
1918 | kmem_cache_destroy(dasd_page_cache); | |
1919 | dasd_page_cache = NULL; | |
1920 | } | |
1da177e4 LT |
1921 | dasd_gendisk_exit(); |
1922 | dasd_devmap_exit(); | |
1da177e4 LT |
1923 | if (dasd_debug_area != NULL) { |
1924 | debug_unregister(dasd_debug_area); | |
1925 | dasd_debug_area = NULL; | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | /* | |
1930 | * SECTION: common functions for ccw_driver use | |
1931 | */ | |
1932 | ||
1c01b8a5 HH |
1933 | /* |
1934 | * Initial attempt at a probe function. this can be simplified once | |
1935 | * the other detection code is gone. | |
1936 | */ | |
1da177e4 LT |
1937 | int |
1938 | dasd_generic_probe (struct ccw_device *cdev, | |
1939 | struct dasd_discipline *discipline) | |
1940 | { | |
1941 | int ret; | |
1942 | ||
40545573 HH |
1943 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
1944 | if (ret) { | |
1945 | printk(KERN_WARNING | |
1946 | "dasd_generic_probe: could not set ccw-device options " | |
1947 | "for %s\n", cdev->dev.bus_id); | |
1948 | return ret; | |
1949 | } | |
1da177e4 LT |
1950 | ret = dasd_add_sysfs_files(cdev); |
1951 | if (ret) { | |
1952 | printk(KERN_WARNING | |
1953 | "dasd_generic_probe: could not add sysfs entries " | |
1954 | "for %s\n", cdev->dev.bus_id); | |
40545573 | 1955 | return ret; |
1da177e4 | 1956 | } |
40545573 | 1957 | cdev->handler = &dasd_int_handler; |
1da177e4 | 1958 | |
40545573 HH |
1959 | /* |
1960 | * Automatically online either all dasd devices (dasd_autodetect) | |
1961 | * or all devices specified with dasd= parameters during | |
1962 | * initial probe. | |
1963 | */ | |
1964 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
1965 | (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0)) | |
1966 | ret = ccw_device_set_online(cdev); | |
1967 | if (ret) | |
1968 | printk(KERN_WARNING | |
1969 | "dasd_generic_probe: could not initially online " | |
1970 | "ccw-device %s\n", cdev->dev.bus_id); | |
1da177e4 LT |
1971 | return ret; |
1972 | } | |
1973 | ||
1c01b8a5 HH |
1974 | /* |
1975 | * This will one day be called from a global not_oper handler. | |
1976 | * It is also used by driver_unregister during module unload. | |
1977 | */ | |
1da177e4 LT |
1978 | void |
1979 | dasd_generic_remove (struct ccw_device *cdev) | |
1980 | { | |
1981 | struct dasd_device *device; | |
1982 | ||
59afda78 HH |
1983 | cdev->handler = NULL; |
1984 | ||
1da177e4 LT |
1985 | dasd_remove_sysfs_files(cdev); |
1986 | device = dasd_device_from_cdev(cdev); | |
1987 | if (IS_ERR(device)) | |
1988 | return; | |
1989 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1990 | /* Already doing offline processing */ | |
1991 | dasd_put_device(device); | |
1992 | return; | |
1993 | } | |
1994 | /* | |
1995 | * This device is removed unconditionally. Set offline | |
1996 | * flag to prevent dasd_open from opening it while it is | |
1997 | * no quite down yet. | |
1998 | */ | |
1999 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2000 | /* dasd_delete_device destroys the device reference. */ | |
2001 | dasd_delete_device(device); | |
2002 | } | |
2003 | ||
1c01b8a5 HH |
2004 | /* |
2005 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2006 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2007 | * or the user has started activation through sysfs. |
2008 | */ | |
1da177e4 LT |
2009 | int |
2010 | dasd_generic_set_online (struct ccw_device *cdev, | |
aa88861f | 2011 | struct dasd_discipline *base_discipline) |
1da177e4 LT |
2012 | |
2013 | { | |
aa88861f | 2014 | struct dasd_discipline *discipline; |
1da177e4 | 2015 | struct dasd_device *device; |
c6eb7b77 | 2016 | int rc; |
f24acd45 | 2017 | |
40545573 HH |
2018 | /* first online clears initial online feature flag */ |
2019 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2020 | device = dasd_create_device(cdev); |
2021 | if (IS_ERR(device)) | |
2022 | return PTR_ERR(device); | |
2023 | ||
aa88861f | 2024 | discipline = base_discipline; |
c6eb7b77 | 2025 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
2026 | if (!dasd_diag_discipline_pointer) { |
2027 | printk (KERN_WARNING | |
2028 | "dasd_generic couldn't online device %s " | |
2029 | "- discipline DIAG not available\n", | |
2030 | cdev->dev.bus_id); | |
2031 | dasd_delete_device(device); | |
2032 | return -ENODEV; | |
2033 | } | |
2034 | discipline = dasd_diag_discipline_pointer; | |
2035 | } | |
aa88861f PO |
2036 | if (!try_module_get(base_discipline->owner)) { |
2037 | dasd_delete_device(device); | |
2038 | return -EINVAL; | |
2039 | } | |
2040 | if (!try_module_get(discipline->owner)) { | |
2041 | module_put(base_discipline->owner); | |
2042 | dasd_delete_device(device); | |
2043 | return -EINVAL; | |
2044 | } | |
2045 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2046 | device->discipline = discipline; |
2047 | ||
2048 | rc = discipline->check_device(device); | |
2049 | if (rc) { | |
2050 | printk (KERN_WARNING | |
2051 | "dasd_generic couldn't online device %s " | |
2052 | "with discipline %s rc=%i\n", | |
2053 | cdev->dev.bus_id, discipline->name, rc); | |
aa88861f PO |
2054 | module_put(discipline->owner); |
2055 | module_put(base_discipline->owner); | |
1da177e4 LT |
2056 | dasd_delete_device(device); |
2057 | return rc; | |
2058 | } | |
2059 | ||
2060 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2061 | if (device->state <= DASD_STATE_KNOWN) { | |
2062 | printk (KERN_WARNING | |
2063 | "dasd_generic discipline not found for %s\n", | |
2064 | cdev->dev.bus_id); | |
2065 | rc = -ENODEV; | |
2066 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2067 | dasd_delete_device(device); | |
2068 | } else | |
2069 | pr_debug("dasd_generic device %s found\n", | |
2070 | cdev->dev.bus_id); | |
2071 | ||
2072 | /* FIXME: we have to wait for the root device but we don't want | |
2073 | * to wait for each single device but for all at once. */ | |
2074 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2075 | ||
2076 | dasd_put_device(device); | |
2077 | ||
2078 | return rc; | |
2079 | } | |
2080 | ||
2081 | int | |
2082 | dasd_generic_set_offline (struct ccw_device *cdev) | |
2083 | { | |
2084 | struct dasd_device *device; | |
dafd87aa | 2085 | int max_count, open_count; |
1da177e4 LT |
2086 | |
2087 | device = dasd_device_from_cdev(cdev); | |
2088 | if (IS_ERR(device)) | |
2089 | return PTR_ERR(device); | |
2090 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2091 | /* Already doing offline processing */ | |
2092 | dasd_put_device(device); | |
2093 | return 0; | |
2094 | } | |
2095 | /* | |
2096 | * We must make sure that this device is currently not in use. | |
2097 | * The open_count is increased for every opener, that includes | |
2098 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2099 | * in the other openers. | |
2100 | */ | |
2101 | max_count = device->bdev ? 0 : -1; | |
dafd87aa HH |
2102 | open_count = (int) atomic_read(&device->open_count); |
2103 | if (open_count > max_count) { | |
2104 | if (open_count > 0) | |
2105 | printk (KERN_WARNING "Can't offline dasd device with " | |
2106 | "open count = %i.\n", | |
2107 | open_count); | |
2108 | else | |
2109 | printk (KERN_WARNING "%s", | |
2110 | "Can't offline dasd device due to internal " | |
2111 | "use\n"); | |
1da177e4 LT |
2112 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2113 | dasd_put_device(device); | |
2114 | return -EBUSY; | |
2115 | } | |
2116 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2117 | /* dasd_delete_device destroys the device reference. */ | |
2118 | dasd_delete_device(device); | |
2119 | ||
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | int | |
2124 | dasd_generic_notify(struct ccw_device *cdev, int event) | |
2125 | { | |
2126 | struct dasd_device *device; | |
2127 | struct dasd_ccw_req *cqr; | |
2128 | unsigned long flags; | |
2129 | int ret; | |
2130 | ||
2131 | device = dasd_device_from_cdev(cdev); | |
2132 | if (IS_ERR(device)) | |
2133 | return 0; | |
2134 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
2135 | ret = 0; | |
2136 | switch (event) { | |
2137 | case CIO_GONE: | |
2138 | case CIO_NO_PATH: | |
20c64468 SW |
2139 | /* First of all call extended error reporting. */ |
2140 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2141 | ||
1da177e4 LT |
2142 | if (device->state < DASD_STATE_BASIC) |
2143 | break; | |
2144 | /* Device is active. We want to keep it. */ | |
2145 | if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) { | |
2146 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2147 | if (cqr->status == DASD_CQR_IN_IO) | |
2148 | cqr->status = DASD_CQR_FAILED; | |
2149 | device->stopped |= DASD_STOPPED_DC_EIO; | |
1da177e4 LT |
2150 | } else { |
2151 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2152 | if (cqr->status == DASD_CQR_IN_IO) { | |
2153 | cqr->status = DASD_CQR_QUEUED; | |
2154 | cqr->retries++; | |
2155 | } | |
2156 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2157 | dasd_set_timer(device, 0); | |
2158 | } | |
1c01b8a5 | 2159 | dasd_schedule_bh(device); |
1da177e4 LT |
2160 | ret = 1; |
2161 | break; | |
2162 | case CIO_OPER: | |
2163 | /* FIXME: add a sanity check. */ | |
2164 | device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO); | |
2165 | dasd_schedule_bh(device); | |
2166 | ret = 1; | |
2167 | break; | |
2168 | } | |
2169 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
2170 | dasd_put_device(device); | |
2171 | return ret; | |
2172 | } | |
2173 | ||
20c64468 | 2174 | |
1da177e4 LT |
2175 | static int __init |
2176 | dasd_init(void) | |
2177 | { | |
2178 | int rc; | |
2179 | ||
2180 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2181 | init_waitqueue_head(&dasd_flush_wq); |
1da177e4 LT |
2182 | |
2183 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
66a464db | 2184 | dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long)); |
1da177e4 LT |
2185 | if (dasd_debug_area == NULL) { |
2186 | rc = -ENOMEM; | |
2187 | goto failed; | |
2188 | } | |
2189 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2190 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2191 | |
2192 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2193 | ||
2194 | dasd_diag_discipline_pointer = NULL; | |
2195 | ||
1da177e4 LT |
2196 | rc = dasd_devmap_init(); |
2197 | if (rc) | |
2198 | goto failed; | |
2199 | rc = dasd_gendisk_init(); | |
2200 | if (rc) | |
2201 | goto failed; | |
2202 | rc = dasd_parse(); | |
2203 | if (rc) | |
2204 | goto failed; | |
20c64468 SW |
2205 | rc = dasd_eer_init(); |
2206 | if (rc) | |
2207 | goto failed; | |
1da177e4 LT |
2208 | #ifdef CONFIG_PROC_FS |
2209 | rc = dasd_proc_init(); | |
2210 | if (rc) | |
2211 | goto failed; | |
2212 | #endif | |
2213 | ||
2214 | return 0; | |
2215 | failed: | |
2216 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2217 | dasd_exit(); | |
2218 | return rc; | |
2219 | } | |
2220 | ||
2221 | module_init(dasd_init); | |
2222 | module_exit(dasd_exit); | |
2223 | ||
2224 | EXPORT_SYMBOL(dasd_debug_area); | |
2225 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2226 | ||
2227 | EXPORT_SYMBOL(dasd_add_request_head); | |
2228 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2229 | EXPORT_SYMBOL(dasd_cancel_req); | |
2230 | EXPORT_SYMBOL(dasd_clear_timer); | |
2231 | EXPORT_SYMBOL(dasd_enable_device); | |
2232 | EXPORT_SYMBOL(dasd_int_handler); | |
2233 | EXPORT_SYMBOL(dasd_kfree_request); | |
2234 | EXPORT_SYMBOL(dasd_kick_device); | |
2235 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
2236 | EXPORT_SYMBOL(dasd_schedule_bh); | |
2237 | EXPORT_SYMBOL(dasd_set_target_state); | |
2238 | EXPORT_SYMBOL(dasd_set_timer); | |
2239 | EXPORT_SYMBOL(dasd_sfree_request); | |
2240 | EXPORT_SYMBOL(dasd_sleep_on); | |
2241 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2242 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2243 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2244 | EXPORT_SYMBOL(dasd_start_IO); | |
2245 | EXPORT_SYMBOL(dasd_term_IO); | |
2246 | ||
2247 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2248 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2249 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2250 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2251 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
1da177e4 | 2252 |