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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); | |
4dfd5c45 HH |
401 | |
402 | /* let user-space know that the device status changed */ | |
403 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
407 | * Kick starter for devices that did not complete the startup/shutdown | |
408 | * procedure or were sleeping because of a pending state. | |
409 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
410 | * event daemon. | |
411 | */ | |
412 | static void | |
4927b3f7 | 413 | do_kick_device(struct work_struct *work) |
1da177e4 | 414 | { |
4927b3f7 | 415 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
1da177e4 LT |
416 | dasd_change_state(device); |
417 | dasd_schedule_bh(device); | |
418 | dasd_put_device(device); | |
419 | } | |
420 | ||
421 | void | |
422 | dasd_kick_device(struct dasd_device *device) | |
423 | { | |
424 | dasd_get_device(device); | |
425 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
426 | schedule_work(&device->kick_work); | |
427 | } | |
428 | ||
429 | /* | |
430 | * Set the target state for a device and starts the state change. | |
431 | */ | |
432 | void | |
433 | dasd_set_target_state(struct dasd_device *device, int target) | |
434 | { | |
435 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
436 | if (dasd_probeonly && target > DASD_STATE_READY) | |
437 | target = DASD_STATE_READY; | |
438 | if (device->target != target) { | |
439 | if (device->state == target) | |
440 | wake_up(&dasd_init_waitq); | |
441 | device->target = target; | |
442 | } | |
443 | if (device->state != device->target) | |
444 | dasd_change_state(device); | |
445 | } | |
446 | ||
447 | /* | |
448 | * Enable devices with device numbers in [from..to]. | |
449 | */ | |
450 | static inline int | |
451 | _wait_for_device(struct dasd_device *device) | |
452 | { | |
453 | return (device->state == device->target); | |
454 | } | |
455 | ||
456 | void | |
457 | dasd_enable_device(struct dasd_device *device) | |
458 | { | |
459 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
460 | if (device->state <= DASD_STATE_KNOWN) | |
461 | /* No discipline for device found. */ | |
462 | dasd_set_target_state(device, DASD_STATE_NEW); | |
463 | /* Now wait for the devices to come up. */ | |
464 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
465 | } | |
466 | ||
467 | /* | |
468 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
469 | */ | |
470 | #ifdef CONFIG_DASD_PROFILE | |
471 | ||
472 | struct dasd_profile_info_t dasd_global_profile; | |
473 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
474 | ||
475 | /* | |
476 | * Increments counter in global and local profiling structures. | |
477 | */ | |
478 | #define dasd_profile_counter(value, counter, device) \ | |
479 | { \ | |
480 | int index; \ | |
481 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
482 | dasd_global_profile.counter[index]++; \ | |
483 | device->profile.counter[index]++; \ | |
484 | } | |
485 | ||
486 | /* | |
487 | * Add profiling information for cqr before execution. | |
488 | */ | |
4d284cac | 489 | static void |
1da177e4 LT |
490 | dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr, |
491 | struct request *req) | |
492 | { | |
493 | struct list_head *l; | |
494 | unsigned int counter; | |
495 | ||
496 | if (dasd_profile_level != DASD_PROFILE_ON) | |
497 | return; | |
498 | ||
499 | /* count the length of the chanq for statistics */ | |
500 | counter = 0; | |
501 | list_for_each(l, &device->ccw_queue) | |
502 | if (++counter >= 31) | |
503 | break; | |
504 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
505 | device->profile.dasd_io_nr_req[counter]++; | |
506 | } | |
507 | ||
508 | /* | |
509 | * Add profiling information for cqr after execution. | |
510 | */ | |
4d284cac | 511 | static void |
1da177e4 LT |
512 | dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr, |
513 | struct request *req) | |
514 | { | |
515 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
516 | long tottimeps, sectors; | |
517 | ||
518 | if (dasd_profile_level != DASD_PROFILE_ON) | |
519 | return; | |
520 | ||
521 | sectors = req->nr_sectors; | |
522 | if (!cqr->buildclk || !cqr->startclk || | |
523 | !cqr->stopclk || !cqr->endclk || | |
524 | !sectors) | |
525 | return; | |
526 | ||
527 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
528 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
529 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
530 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
531 | tottimeps = tottime / sectors; | |
532 | ||
533 | if (!dasd_global_profile.dasd_io_reqs) | |
534 | memset(&dasd_global_profile, 0, | |
535 | sizeof (struct dasd_profile_info_t)); | |
536 | dasd_global_profile.dasd_io_reqs++; | |
537 | dasd_global_profile.dasd_io_sects += sectors; | |
538 | ||
539 | if (!device->profile.dasd_io_reqs) | |
540 | memset(&device->profile, 0, | |
541 | sizeof (struct dasd_profile_info_t)); | |
542 | device->profile.dasd_io_reqs++; | |
543 | device->profile.dasd_io_sects += sectors; | |
544 | ||
545 | dasd_profile_counter(sectors, dasd_io_secs, device); | |
546 | dasd_profile_counter(tottime, dasd_io_times, device); | |
547 | dasd_profile_counter(tottimeps, dasd_io_timps, device); | |
548 | dasd_profile_counter(strtime, dasd_io_time1, device); | |
549 | dasd_profile_counter(irqtime, dasd_io_time2, device); | |
550 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device); | |
551 | dasd_profile_counter(endtime, dasd_io_time3, device); | |
552 | } | |
553 | #else | |
554 | #define dasd_profile_start(device, cqr, req) do {} while (0) | |
555 | #define dasd_profile_end(device, cqr, req) do {} while (0) | |
556 | #endif /* CONFIG_DASD_PROFILE */ | |
557 | ||
558 | /* | |
559 | * Allocate memory for a channel program with 'cplength' channel | |
560 | * command words and 'datasize' additional space. There are two | |
561 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
562 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
563 | * that gets allocated for each device. | |
564 | */ | |
565 | struct dasd_ccw_req * | |
566 | dasd_kmalloc_request(char *magic, int cplength, int datasize, | |
567 | struct dasd_device * device) | |
568 | { | |
569 | struct dasd_ccw_req *cqr; | |
570 | ||
571 | /* Sanity checks */ | |
7ac1e877 ES |
572 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
573 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 574 | |
88abaab4 | 575 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
576 | if (cqr == NULL) |
577 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
578 | cqr->cpaddr = NULL; |
579 | if (cplength > 0) { | |
88abaab4 | 580 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
581 | GFP_ATOMIC | GFP_DMA); |
582 | if (cqr->cpaddr == NULL) { | |
583 | kfree(cqr); | |
584 | return ERR_PTR(-ENOMEM); | |
585 | } | |
1da177e4 LT |
586 | } |
587 | cqr->data = NULL; | |
588 | if (datasize > 0) { | |
88abaab4 | 589 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 590 | if (cqr->data == NULL) { |
17fd682e | 591 | kfree(cqr->cpaddr); |
1da177e4 LT |
592 | kfree(cqr); |
593 | return ERR_PTR(-ENOMEM); | |
594 | } | |
1da177e4 LT |
595 | } |
596 | strncpy((char *) &cqr->magic, magic, 4); | |
597 | ASCEBC((char *) &cqr->magic, 4); | |
598 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
599 | dasd_get_device(device); | |
600 | return cqr; | |
601 | } | |
602 | ||
603 | struct dasd_ccw_req * | |
604 | dasd_smalloc_request(char *magic, int cplength, int datasize, | |
605 | struct dasd_device * device) | |
606 | { | |
607 | unsigned long flags; | |
608 | struct dasd_ccw_req *cqr; | |
609 | char *data; | |
610 | int size; | |
611 | ||
612 | /* Sanity checks */ | |
7ac1e877 ES |
613 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
614 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
615 | |
616 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
617 | if (cplength > 0) | |
618 | size += cplength * sizeof(struct ccw1); | |
619 | if (datasize > 0) | |
620 | size += datasize; | |
621 | spin_lock_irqsave(&device->mem_lock, flags); | |
622 | cqr = (struct dasd_ccw_req *) | |
623 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
624 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
625 | if (cqr == NULL) | |
626 | return ERR_PTR(-ENOMEM); | |
627 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
628 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
629 | cqr->cpaddr = NULL; | |
630 | if (cplength > 0) { | |
631 | cqr->cpaddr = (struct ccw1 *) data; | |
632 | data += cplength*sizeof(struct ccw1); | |
633 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
634 | } | |
635 | cqr->data = NULL; | |
636 | if (datasize > 0) { | |
637 | cqr->data = data; | |
638 | memset(cqr->data, 0, datasize); | |
639 | } | |
640 | strncpy((char *) &cqr->magic, magic, 4); | |
641 | ASCEBC((char *) &cqr->magic, 4); | |
642 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
643 | dasd_get_device(device); | |
644 | return cqr; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Free memory of a channel program. This function needs to free all the | |
649 | * idal lists that might have been created by dasd_set_cda and the | |
650 | * struct dasd_ccw_req itself. | |
651 | */ | |
652 | void | |
653 | dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
654 | { | |
347a8dc3 | 655 | #ifdef CONFIG_64BIT |
1da177e4 LT |
656 | struct ccw1 *ccw; |
657 | ||
658 | /* Clear any idals used for the request. */ | |
659 | ccw = cqr->cpaddr; | |
660 | do { | |
661 | clear_normalized_cda(ccw); | |
662 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
663 | #endif | |
17fd682e JJ |
664 | kfree(cqr->cpaddr); |
665 | kfree(cqr->data); | |
1da177e4 LT |
666 | kfree(cqr); |
667 | dasd_put_device(device); | |
668 | } | |
669 | ||
670 | void | |
671 | dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
672 | { | |
673 | unsigned long flags; | |
674 | ||
675 | spin_lock_irqsave(&device->mem_lock, flags); | |
676 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
677 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
678 | dasd_put_device(device); | |
679 | } | |
680 | ||
681 | /* | |
682 | * Check discipline magic in cqr. | |
683 | */ | |
684 | static inline int | |
685 | dasd_check_cqr(struct dasd_ccw_req *cqr) | |
686 | { | |
687 | struct dasd_device *device; | |
688 | ||
689 | if (cqr == NULL) | |
690 | return -EINVAL; | |
691 | device = cqr->device; | |
692 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { | |
693 | DEV_MESSAGE(KERN_WARNING, device, | |
694 | " dasd_ccw_req 0x%08x magic doesn't match" | |
695 | " discipline 0x%08x", | |
696 | cqr->magic, | |
697 | *(unsigned int *) device->discipline->name); | |
698 | return -EINVAL; | |
699 | } | |
700 | return 0; | |
701 | } | |
702 | ||
703 | /* | |
704 | * Terminate the current i/o and set the request to clear_pending. | |
705 | * Timer keeps device runnig. | |
706 | * ccw_device_clear can fail if the i/o subsystem | |
707 | * is in a bad mood. | |
708 | */ | |
709 | int | |
710 | dasd_term_IO(struct dasd_ccw_req * cqr) | |
711 | { | |
712 | struct dasd_device *device; | |
713 | int retries, rc; | |
714 | ||
715 | /* Check the cqr */ | |
716 | rc = dasd_check_cqr(cqr); | |
717 | if (rc) | |
718 | return rc; | |
719 | retries = 0; | |
720 | device = (struct dasd_device *) cqr->device; | |
721 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { | |
722 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
723 | switch (rc) { | |
724 | case 0: /* termination successful */ | |
c2ba444d HH |
725 | cqr->retries--; |
726 | cqr->status = DASD_CQR_CLEAR; | |
1da177e4 | 727 | cqr->stopclk = get_clock(); |
8f61701b | 728 | cqr->starttime = 0; |
1da177e4 LT |
729 | DBF_DEV_EVENT(DBF_DEBUG, device, |
730 | "terminate cqr %p successful", | |
731 | cqr); | |
732 | break; | |
733 | case -ENODEV: | |
734 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
735 | "device gone, retry"); | |
736 | break; | |
737 | case -EIO: | |
738 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
739 | "I/O error, retry"); | |
740 | break; | |
741 | case -EINVAL: | |
742 | case -EBUSY: | |
743 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
744 | "device busy, retry later"); | |
745 | break; | |
746 | default: | |
747 | DEV_MESSAGE(KERN_ERR, device, | |
748 | "line %d unknown RC=%d, please " | |
749 | "report to linux390@de.ibm.com", | |
750 | __LINE__, rc); | |
751 | BUG(); | |
752 | break; | |
753 | } | |
754 | retries++; | |
755 | } | |
756 | dasd_schedule_bh(device); | |
757 | return rc; | |
758 | } | |
759 | ||
760 | /* | |
761 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
762 | * In that case set up a timer to start the request later. | |
763 | */ | |
764 | int | |
765 | dasd_start_IO(struct dasd_ccw_req * cqr) | |
766 | { | |
767 | struct dasd_device *device; | |
768 | int rc; | |
769 | ||
770 | /* Check the cqr */ | |
771 | rc = dasd_check_cqr(cqr); | |
772 | if (rc) | |
773 | return rc; | |
774 | device = (struct dasd_device *) cqr->device; | |
775 | if (cqr->retries < 0) { | |
776 | DEV_MESSAGE(KERN_DEBUG, device, | |
777 | "start_IO: request %p (%02x/%i) - no retry left.", | |
778 | cqr, cqr->status, cqr->retries); | |
779 | cqr->status = DASD_CQR_FAILED; | |
780 | return -EIO; | |
781 | } | |
782 | cqr->startclk = get_clock(); | |
783 | cqr->starttime = jiffies; | |
784 | cqr->retries--; | |
785 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
786 | cqr->lpm, 0); | |
787 | switch (rc) { | |
788 | case 0: | |
789 | cqr->status = DASD_CQR_IN_IO; | |
790 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
791 | "start_IO: request %p started successful", | |
792 | cqr); | |
793 | break; | |
794 | case -EBUSY: | |
795 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
796 | "start_IO: device busy, retry later"); | |
797 | break; | |
798 | case -ETIMEDOUT: | |
799 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
800 | "start_IO: request timeout, retry later"); | |
801 | break; | |
802 | case -EACCES: | |
803 | /* -EACCES indicates that the request used only a | |
804 | * subset of the available pathes and all these | |
805 | * pathes are gone. | |
806 | * Do a retry with all available pathes. | |
807 | */ | |
808 | cqr->lpm = LPM_ANYPATH; | |
809 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
810 | "start_IO: selected pathes gone," | |
811 | " retry on all pathes"); | |
812 | break; | |
813 | case -ENODEV: | |
814 | case -EIO: | |
815 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
816 | "start_IO: device gone, retry"); | |
817 | break; | |
818 | default: | |
819 | DEV_MESSAGE(KERN_ERR, device, | |
820 | "line %d unknown RC=%d, please report" | |
821 | " to linux390@de.ibm.com", __LINE__, rc); | |
822 | BUG(); | |
823 | break; | |
824 | } | |
825 | return rc; | |
826 | } | |
827 | ||
828 | /* | |
829 | * Timeout function for dasd devices. This is used for different purposes | |
830 | * 1) missing interrupt handler for normal operation | |
831 | * 2) delayed start of request where start_IO failed with -EBUSY | |
832 | * 3) timeout for missing state change interrupts | |
833 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
834 | * DASD_CQR_QUEUED for 2) and 3). | |
835 | */ | |
836 | static void | |
837 | dasd_timeout_device(unsigned long ptr) | |
838 | { | |
839 | unsigned long flags; | |
840 | struct dasd_device *device; | |
841 | ||
842 | device = (struct dasd_device *) ptr; | |
843 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
844 | /* re-activate request queue */ | |
845 | device->stopped &= ~DASD_STOPPED_PENDING; | |
846 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
847 | dasd_schedule_bh(device); | |
848 | } | |
849 | ||
850 | /* | |
851 | * Setup timeout for a device in jiffies. | |
852 | */ | |
853 | void | |
854 | dasd_set_timer(struct dasd_device *device, int expires) | |
855 | { | |
856 | if (expires == 0) { | |
857 | if (timer_pending(&device->timer)) | |
858 | del_timer(&device->timer); | |
859 | return; | |
860 | } | |
861 | if (timer_pending(&device->timer)) { | |
862 | if (mod_timer(&device->timer, jiffies + expires)) | |
863 | return; | |
864 | } | |
865 | device->timer.function = dasd_timeout_device; | |
866 | device->timer.data = (unsigned long) device; | |
867 | device->timer.expires = jiffies + expires; | |
868 | add_timer(&device->timer); | |
869 | } | |
870 | ||
871 | /* | |
872 | * Clear timeout for a device. | |
873 | */ | |
874 | void | |
875 | dasd_clear_timer(struct dasd_device *device) | |
876 | { | |
877 | if (timer_pending(&device->timer)) | |
878 | del_timer(&device->timer); | |
879 | } | |
880 | ||
881 | static void | |
882 | dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm) | |
883 | { | |
884 | struct dasd_ccw_req *cqr; | |
885 | struct dasd_device *device; | |
886 | ||
887 | cqr = (struct dasd_ccw_req *) intparm; | |
888 | if (cqr->status != DASD_CQR_IN_IO) { | |
889 | MESSAGE(KERN_DEBUG, | |
890 | "invalid status in handle_killed_request: " | |
891 | "bus_id %s, status %02x", | |
892 | cdev->dev.bus_id, cqr->status); | |
893 | return; | |
894 | } | |
895 | ||
896 | device = (struct dasd_device *) cqr->device; | |
897 | if (device == NULL || | |
a00bfd71 | 898 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 LT |
899 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
900 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
901 | cdev->dev.bus_id); | |
902 | return; | |
903 | } | |
904 | ||
905 | /* Schedule request to be retried. */ | |
906 | cqr->status = DASD_CQR_QUEUED; | |
907 | ||
908 | dasd_clear_timer(device); | |
909 | dasd_schedule_bh(device); | |
910 | dasd_put_device(device); | |
911 | } | |
912 | ||
913 | static void | |
914 | dasd_handle_state_change_pending(struct dasd_device *device) | |
915 | { | |
916 | struct dasd_ccw_req *cqr; | |
917 | struct list_head *l, *n; | |
918 | ||
20c64468 SW |
919 | /* First of all start sense subsystem status request. */ |
920 | dasd_eer_snss(device); | |
921 | ||
1da177e4 LT |
922 | device->stopped &= ~DASD_STOPPED_PENDING; |
923 | ||
924 | /* restart all 'running' IO on queue */ | |
925 | list_for_each_safe(l, n, &device->ccw_queue) { | |
926 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
927 | if (cqr->status == DASD_CQR_IN_IO) { | |
928 | cqr->status = DASD_CQR_QUEUED; | |
929 | } | |
930 | } | |
931 | dasd_clear_timer(device); | |
932 | dasd_schedule_bh(device); | |
933 | } | |
934 | ||
935 | /* | |
936 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
937 | */ | |
938 | void | |
939 | dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
940 | struct irb *irb) | |
941 | { | |
942 | struct dasd_ccw_req *cqr, *next; | |
943 | struct dasd_device *device; | |
944 | unsigned long long now; | |
945 | int expires; | |
946 | dasd_era_t era; | |
947 | char mask; | |
948 | ||
949 | if (IS_ERR(irb)) { | |
950 | switch (PTR_ERR(irb)) { | |
951 | case -EIO: | |
952 | dasd_handle_killed_request(cdev, intparm); | |
953 | break; | |
954 | case -ETIMEDOUT: | |
955 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
956 | __FUNCTION__, cdev->dev.bus_id); | |
957 | //FIXME - dasd uses own timeout interface... | |
958 | break; | |
959 | default: | |
960 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
961 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); | |
962 | } | |
963 | return; | |
964 | } | |
965 | ||
966 | now = get_clock(); | |
967 | ||
968 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
969 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), | |
970 | (unsigned int) intparm); | |
971 | ||
972 | /* first of all check for state change pending interrupt */ | |
973 | mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; | |
974 | if ((irb->scsw.dstat & mask) == mask) { | |
a00bfd71 | 975 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
976 | if (!IS_ERR(device)) { |
977 | dasd_handle_state_change_pending(device); | |
978 | dasd_put_device(device); | |
979 | } | |
980 | return; | |
981 | } | |
982 | ||
983 | cqr = (struct dasd_ccw_req *) intparm; | |
984 | ||
985 | /* check for unsolicited interrupts */ | |
986 | if (cqr == NULL) { | |
987 | MESSAGE(KERN_DEBUG, | |
988 | "unsolicited interrupt received: bus_id %s", | |
989 | cdev->dev.bus_id); | |
990 | return; | |
991 | } | |
992 | ||
993 | device = (struct dasd_device *) cqr->device; | |
994 | if (device == NULL || | |
995 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
996 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
997 | cdev->dev.bus_id); | |
998 | return; | |
999 | } | |
1000 | ||
1001 | /* Check for clear pending */ | |
1002 | if (cqr->status == DASD_CQR_CLEAR && | |
1003 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { | |
1004 | cqr->status = DASD_CQR_QUEUED; | |
1005 | dasd_clear_timer(device); | |
8f61701b | 1006 | wake_up(&dasd_flush_wq); |
1da177e4 LT |
1007 | dasd_schedule_bh(device); |
1008 | return; | |
1009 | } | |
1010 | ||
1011 | /* check status - the request might have been killed by dyn detach */ | |
1012 | if (cqr->status != DASD_CQR_IN_IO) { | |
1013 | MESSAGE(KERN_DEBUG, | |
1014 | "invalid status: bus_id %s, status %02x", | |
1015 | cdev->dev.bus_id, cqr->status); | |
1016 | return; | |
1017 | } | |
1018 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
1019 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); | |
1020 | ||
1021 | /* Find out the appropriate era_action. */ | |
138c014d | 1022 | if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) |
1da177e4 LT |
1023 | era = dasd_era_fatal; |
1024 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
1025 | irb->scsw.cstat == 0 && | |
1026 | !irb->esw.esw0.erw.cons) | |
1027 | era = dasd_era_none; | |
1da177e4 LT |
1028 | else if (irb->esw.esw0.erw.cons) |
1029 | era = device->discipline->examine_error(cqr, irb); | |
138c014d | 1030 | else |
1da177e4 LT |
1031 | era = dasd_era_recover; |
1032 | ||
1033 | DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); | |
1034 | expires = 0; | |
1035 | if (era == dasd_era_none) { | |
1036 | cqr->status = DASD_CQR_DONE; | |
1037 | cqr->stopclk = now; | |
1038 | /* Start first request on queue if possible -> fast_io. */ | |
1039 | if (cqr->list.next != &device->ccw_queue) { | |
1040 | next = list_entry(cqr->list.next, | |
1041 | struct dasd_ccw_req, list); | |
1042 | if ((next->status == DASD_CQR_QUEUED) && | |
1043 | (!device->stopped)) { | |
1044 | if (device->discipline->start_IO(next) == 0) | |
1045 | expires = next->expires; | |
1046 | else | |
1047 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1048 | "Interrupt fastpath " | |
1049 | "failed!"); | |
1050 | } | |
1051 | } | |
1052 | } else { /* error */ | |
1053 | memcpy(&cqr->irb, irb, sizeof (struct irb)); | |
9575bf26 HH |
1054 | if (device->features & DASD_FEATURE_ERPLOG) { |
1055 | /* dump sense data */ | |
1056 | dasd_log_sense(cqr, irb); | |
1057 | } | |
1da177e4 LT |
1058 | switch (era) { |
1059 | case dasd_era_fatal: | |
1060 | cqr->status = DASD_CQR_FAILED; | |
1061 | cqr->stopclk = now; | |
1062 | break; | |
1063 | case dasd_era_recover: | |
1064 | cqr->status = DASD_CQR_ERROR; | |
1065 | break; | |
1066 | default: | |
1067 | BUG(); | |
1068 | } | |
1069 | } | |
1070 | if (expires != 0) | |
1071 | dasd_set_timer(device, expires); | |
1072 | else | |
1073 | dasd_clear_timer(device); | |
1074 | dasd_schedule_bh(device); | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * posts the buffer_cache about a finalized request | |
1079 | */ | |
1080 | static inline void | |
1081 | dasd_end_request(struct request *req, int uptodate) | |
1082 | { | |
1083 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) | |
1084 | BUG(); | |
1085 | add_disk_randomness(req->rq_disk); | |
8ffdc655 | 1086 | end_that_request_last(req, uptodate); |
1da177e4 LT |
1087 | } |
1088 | ||
1089 | /* | |
1090 | * Process finished error recovery ccw. | |
1091 | */ | |
1092 | static inline void | |
1093 | __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr) | |
1094 | { | |
1095 | dasd_erp_fn_t erp_fn; | |
1096 | ||
1097 | if (cqr->status == DASD_CQR_DONE) | |
1098 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1099 | else | |
1100 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1101 | erp_fn = device->discipline->erp_postaction(cqr); | |
1102 | erp_fn(cqr); | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Process ccw request queue. | |
1107 | */ | |
4d284cac | 1108 | static void |
1da177e4 LT |
1109 | __dasd_process_ccw_queue(struct dasd_device * device, |
1110 | struct list_head *final_queue) | |
1111 | { | |
1112 | struct list_head *l, *n; | |
1113 | struct dasd_ccw_req *cqr; | |
1114 | dasd_erp_fn_t erp_fn; | |
1115 | ||
1116 | restart: | |
1117 | /* Process request with final status. */ | |
1118 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1119 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1120 | /* Stop list processing at the first non-final request. */ | |
1121 | if (cqr->status != DASD_CQR_DONE && | |
1122 | cqr->status != DASD_CQR_FAILED && | |
1123 | cqr->status != DASD_CQR_ERROR) | |
1124 | break; | |
1125 | /* Process requests with DASD_CQR_ERROR */ | |
1126 | if (cqr->status == DASD_CQR_ERROR) { | |
1127 | if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) { | |
1128 | cqr->status = DASD_CQR_FAILED; | |
1129 | cqr->stopclk = get_clock(); | |
1130 | } else { | |
336c340b HH |
1131 | if (cqr->irb.esw.esw0.erw.cons && |
1132 | test_bit(DASD_CQR_FLAGS_USE_ERP, | |
1133 | &cqr->flags)) { | |
1da177e4 LT |
1134 | erp_fn = device->discipline-> |
1135 | erp_action(cqr); | |
1136 | erp_fn(cqr); | |
1137 | } else | |
1138 | dasd_default_erp_action(cqr); | |
1139 | } | |
1140 | goto restart; | |
1141 | } | |
20c64468 SW |
1142 | |
1143 | /* First of all call extended error reporting. */ | |
1144 | if (dasd_eer_enabled(device) && | |
1145 | cqr->status == DASD_CQR_FAILED) { | |
1146 | dasd_eer_write(device, cqr, DASD_EER_FATALERROR); | |
1147 | ||
1148 | /* restart request */ | |
1149 | cqr->status = DASD_CQR_QUEUED; | |
1150 | cqr->retries = 255; | |
1151 | device->stopped |= DASD_STOPPED_QUIESCE; | |
1152 | goto restart; | |
1153 | } | |
1154 | ||
1da177e4 LT |
1155 | /* Process finished ERP request. */ |
1156 | if (cqr->refers) { | |
1157 | __dasd_process_erp(device, cqr); | |
1158 | goto restart; | |
1159 | } | |
1160 | ||
1161 | /* Rechain finished requests to final queue */ | |
1162 | cqr->endclk = get_clock(); | |
1163 | list_move_tail(&cqr->list, final_queue); | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | static void | |
1168 | dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data) | |
1169 | { | |
1170 | struct request *req; | |
1171 | struct dasd_device *device; | |
1172 | int status; | |
1173 | ||
1174 | req = (struct request *) data; | |
1175 | device = cqr->device; | |
1176 | dasd_profile_end(device, cqr, req); | |
1177 | status = cqr->device->discipline->free_cp(cqr,req); | |
1178 | spin_lock_irq(&device->request_queue_lock); | |
1179 | dasd_end_request(req, status); | |
1180 | spin_unlock_irq(&device->request_queue_lock); | |
1181 | } | |
1182 | ||
1183 | ||
1184 | /* | |
1185 | * Fetch requests from the block device queue. | |
1186 | */ | |
4d284cac | 1187 | static void |
1da177e4 LT |
1188 | __dasd_process_blk_queue(struct dasd_device * device) |
1189 | { | |
165125e1 | 1190 | struct request_queue *queue; |
1da177e4 LT |
1191 | struct request *req; |
1192 | struct dasd_ccw_req *cqr; | |
c6eb7b77 | 1193 | int nr_queued; |
1da177e4 LT |
1194 | |
1195 | queue = device->request_queue; | |
1196 | /* No queue ? Then there is nothing to do. */ | |
1197 | if (queue == NULL) | |
1198 | return; | |
1199 | ||
1200 | /* | |
1201 | * We requeue request from the block device queue to the ccw | |
1202 | * queue only in two states. In state DASD_STATE_READY the | |
1203 | * partition detection is done and we need to requeue requests | |
1204 | * for that. State DASD_STATE_ONLINE is normal block device | |
1205 | * operation. | |
1206 | */ | |
1207 | if (device->state != DASD_STATE_READY && | |
1208 | device->state != DASD_STATE_ONLINE) | |
1209 | return; | |
1210 | nr_queued = 0; | |
1211 | /* Now we try to fetch requests from the request queue */ | |
1212 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1213 | if (cqr->status == DASD_CQR_QUEUED) | |
1214 | nr_queued++; | |
1215 | while (!blk_queue_plugged(queue) && | |
1216 | elv_next_request(queue) && | |
1217 | nr_queued < DASD_CHANQ_MAX_SIZE) { | |
1218 | req = elv_next_request(queue); | |
f24acd45 | 1219 | |
c6eb7b77 HH |
1220 | if (device->features & DASD_FEATURE_READONLY && |
1221 | rq_data_dir(req) == WRITE) { | |
1da177e4 LT |
1222 | DBF_DEV_EVENT(DBF_ERR, device, |
1223 | "Rejecting write request %p", | |
1224 | req); | |
1225 | blkdev_dequeue_request(req); | |
1226 | dasd_end_request(req, 0); | |
1227 | continue; | |
1228 | } | |
1229 | if (device->stopped & DASD_STOPPED_DC_EIO) { | |
1230 | blkdev_dequeue_request(req); | |
1231 | dasd_end_request(req, 0); | |
1232 | continue; | |
1233 | } | |
1234 | cqr = device->discipline->build_cp(device, req); | |
1235 | if (IS_ERR(cqr)) { | |
1236 | if (PTR_ERR(cqr) == -ENOMEM) | |
1237 | break; /* terminate request queue loop */ | |
d54853ef MS |
1238 | if (PTR_ERR(cqr) == -EAGAIN) { |
1239 | /* | |
1240 | * The current request cannot be build right | |
1241 | * now, we have to try later. If this request | |
1242 | * is the head-of-queue we stop the device | |
1243 | * for 1/2 second. | |
1244 | */ | |
1245 | if (!list_empty(&device->ccw_queue)) | |
1246 | break; | |
1247 | device->stopped |= DASD_STOPPED_PENDING; | |
1248 | dasd_set_timer(device, HZ/2); | |
1249 | break; | |
1250 | } | |
1da177e4 LT |
1251 | DBF_DEV_EVENT(DBF_ERR, device, |
1252 | "CCW creation failed (rc=%ld) " | |
1253 | "on request %p", | |
1254 | PTR_ERR(cqr), req); | |
1255 | blkdev_dequeue_request(req); | |
1256 | dasd_end_request(req, 0); | |
1257 | continue; | |
1258 | } | |
1259 | cqr->callback = dasd_end_request_cb; | |
1260 | cqr->callback_data = (void *) req; | |
1261 | cqr->status = DASD_CQR_QUEUED; | |
1262 | blkdev_dequeue_request(req); | |
1263 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1264 | dasd_profile_start(device, cqr, req); | |
1265 | nr_queued++; | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * Take a look at the first request on the ccw queue and check | |
1271 | * if it reached its expire time. If so, terminate the IO. | |
1272 | */ | |
4d284cac | 1273 | static void |
1da177e4 LT |
1274 | __dasd_check_expire(struct dasd_device * device) |
1275 | { | |
1276 | struct dasd_ccw_req *cqr; | |
1277 | ||
1278 | if (list_empty(&device->ccw_queue)) | |
1279 | return; | |
1280 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
29145a6c HH |
1281 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1282 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1283 | if (device->discipline->term_IO(cqr) != 0) { | |
1284 | /* Hmpf, try again in 5 sec */ | |
1285 | dasd_set_timer(device, 5*HZ); | |
1286 | DEV_MESSAGE(KERN_ERR, device, | |
1287 | "internal error - timeout (%is) expired " | |
1288 | "for cqr %p, termination failed, " | |
1289 | "retrying in 5s", | |
1290 | (cqr->expires/HZ), cqr); | |
1291 | } else { | |
8f61701b HH |
1292 | DEV_MESSAGE(KERN_ERR, device, |
1293 | "internal error - timeout (%is) expired " | |
1294 | "for cqr %p (%i retries left)", | |
1295 | (cqr->expires/HZ), cqr, cqr->retries); | |
1da177e4 LT |
1296 | } |
1297 | } | |
1298 | } | |
1299 | ||
1300 | /* | |
1301 | * Take a look at the first request on the ccw queue and check | |
1302 | * if it needs to be started. | |
1303 | */ | |
4d284cac | 1304 | static void |
1da177e4 LT |
1305 | __dasd_start_head(struct dasd_device * device) |
1306 | { | |
1307 | struct dasd_ccw_req *cqr; | |
1308 | int rc; | |
1309 | ||
1310 | if (list_empty(&device->ccw_queue)) | |
1311 | return; | |
1312 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
25ee4cf8 PO |
1313 | if (cqr->status != DASD_CQR_QUEUED) |
1314 | return; | |
1315 | /* Non-temporary stop condition will trigger fail fast */ | |
1c01b8a5 | 1316 | if (device->stopped & ~DASD_STOPPED_PENDING && |
20c64468 SW |
1317 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
1318 | (!dasd_eer_enabled(device))) { | |
1c01b8a5 HH |
1319 | cqr->status = DASD_CQR_FAILED; |
1320 | dasd_schedule_bh(device); | |
25ee4cf8 | 1321 | return; |
1c01b8a5 | 1322 | } |
25ee4cf8 PO |
1323 | /* Don't try to start requests if device is stopped */ |
1324 | if (device->stopped) | |
1325 | return; | |
1326 | ||
1327 | rc = device->discipline->start_IO(cqr); | |
1328 | if (rc == 0) | |
1329 | dasd_set_timer(device, cqr->expires); | |
1330 | else if (rc == -EACCES) { | |
1331 | dasd_schedule_bh(device); | |
1332 | } else | |
1333 | /* Hmpf, try again in 1/2 sec */ | |
1334 | dasd_set_timer(device, 50); | |
1da177e4 LT |
1335 | } |
1336 | ||
8f61701b HH |
1337 | static inline int |
1338 | _wait_for_clear(struct dasd_ccw_req *cqr) | |
1339 | { | |
1340 | return (cqr->status == DASD_CQR_QUEUED); | |
1341 | } | |
1342 | ||
1da177e4 | 1343 | /* |
8f61701b HH |
1344 | * Remove all requests from the ccw queue (all = '1') or only block device |
1345 | * requests in case all = '0'. | |
1346 | * Take care of the erp-chain (chained via cqr->refers) and remove either | |
1347 | * the whole erp-chain or none of the erp-requests. | |
1348 | * If a request is currently running, term_IO is called and the request | |
1349 | * is re-queued. Prior to removing the terminated request we need to wait | |
1350 | * for the clear-interrupt. | |
1351 | * In case termination is not possible we stop processing and just finishing | |
1352 | * the already moved requests. | |
1da177e4 | 1353 | */ |
8f61701b | 1354 | static int |
1da177e4 LT |
1355 | dasd_flush_ccw_queue(struct dasd_device * device, int all) |
1356 | { | |
8f61701b HH |
1357 | struct dasd_ccw_req *cqr, *orig, *n; |
1358 | int rc, i; | |
1359 | ||
1da177e4 | 1360 | struct list_head flush_queue; |
1da177e4 LT |
1361 | |
1362 | INIT_LIST_HEAD(&flush_queue); | |
1363 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b HH |
1364 | rc = 0; |
1365 | restart: | |
1366 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, list) { | |
1367 | /* get original request of erp request-chain */ | |
1368 | for (orig = cqr; orig->refers != NULL; orig = orig->refers); | |
1369 | ||
1da177e4 | 1370 | /* Flush all request or only block device requests? */ |
8f61701b HH |
1371 | if (all == 0 && cqr->callback != dasd_end_request_cb && |
1372 | orig->callback != dasd_end_request_cb) { | |
1da177e4 | 1373 | continue; |
8f61701b HH |
1374 | } |
1375 | /* Check status and move request to flush_queue */ | |
1376 | switch (cqr->status) { | |
1377 | case DASD_CQR_IN_IO: | |
1378 | rc = device->discipline->term_IO(cqr); | |
1379 | if (rc) { | |
1380 | /* unable to terminate requeust */ | |
1381 | DEV_MESSAGE(KERN_ERR, device, | |
1382 | "dasd flush ccw_queue is unable " | |
1383 | " to terminate request %p", | |
1384 | cqr); | |
1385 | /* stop flush processing */ | |
1386 | goto finished; | |
1387 | } | |
1388 | break; | |
1389 | case DASD_CQR_QUEUED: | |
1390 | case DASD_CQR_ERROR: | |
1391 | /* set request to FAILED */ | |
1da177e4 | 1392 | cqr->stopclk = get_clock(); |
8f61701b HH |
1393 | cqr->status = DASD_CQR_FAILED; |
1394 | break; | |
1395 | default: /* do not touch the others */ | |
1396 | break; | |
1397 | } | |
1398 | /* Rechain request (including erp chain) */ | |
1399 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) { | |
1400 | cqr->endclk = get_clock(); | |
1401 | list_move_tail(&cqr->list, &flush_queue); | |
1402 | } | |
1403 | if (i > 1) | |
1404 | /* moved more than one request - need to restart */ | |
1405 | goto restart; | |
1406 | } | |
1407 | ||
1408 | finished: | |
1409 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1410 | /* Now call the callback function of flushed requests */ | |
1411 | restart_cb: | |
1412 | list_for_each_entry_safe(cqr, n, &flush_queue, list) { | |
1413 | if (cqr->status == DASD_CQR_CLEAR) { | |
1414 | /* wait for clear interrupt! */ | |
1415 | wait_event(dasd_flush_wq, _wait_for_clear(cqr)); | |
1416 | cqr->status = DASD_CQR_FAILED; | |
1da177e4 LT |
1417 | } |
1418 | /* Process finished ERP request. */ | |
1419 | if (cqr->refers) { | |
1420 | __dasd_process_erp(device, cqr); | |
8f61701b HH |
1421 | /* restart list_for_xx loop since dasd_process_erp |
1422 | * might remove multiple elements */ | |
1423 | goto restart_cb; | |
1da177e4 | 1424 | } |
8f61701b | 1425 | /* call the callback function */ |
1da177e4 | 1426 | cqr->endclk = get_clock(); |
1da177e4 LT |
1427 | if (cqr->callback != NULL) |
1428 | (cqr->callback)(cqr, cqr->callback_data); | |
1429 | } | |
8f61701b | 1430 | return rc; |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | /* | |
1434 | * Acquire the device lock and process queues for the device. | |
1435 | */ | |
1436 | static void | |
1437 | dasd_tasklet(struct dasd_device * device) | |
1438 | { | |
1439 | struct list_head final_queue; | |
1440 | struct list_head *l, *n; | |
1441 | struct dasd_ccw_req *cqr; | |
1442 | ||
1443 | atomic_set (&device->tasklet_scheduled, 0); | |
1444 | INIT_LIST_HEAD(&final_queue); | |
1445 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1446 | /* Check expire time of first request on the ccw queue. */ | |
1447 | __dasd_check_expire(device); | |
1448 | /* Finish off requests on ccw queue */ | |
1449 | __dasd_process_ccw_queue(device, &final_queue); | |
1450 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1451 | /* Now call the callback function of requests with final status */ | |
1452 | list_for_each_safe(l, n, &final_queue) { | |
1453 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
c2ba444d | 1454 | list_del_init(&cqr->list); |
1da177e4 LT |
1455 | if (cqr->callback != NULL) |
1456 | (cqr->callback)(cqr, cqr->callback_data); | |
1457 | } | |
1458 | spin_lock_irq(&device->request_queue_lock); | |
1459 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1460 | /* Get new request from the block device request queue */ | |
1461 | __dasd_process_blk_queue(device); | |
1462 | /* Now check if the head of the ccw queue needs to be started. */ | |
1463 | __dasd_start_head(device); | |
1464 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1465 | spin_unlock_irq(&device->request_queue_lock); | |
1466 | dasd_put_device(device); | |
1467 | } | |
1468 | ||
1469 | /* | |
1470 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1471 | */ | |
1472 | void | |
1473 | dasd_schedule_bh(struct dasd_device * device) | |
1474 | { | |
1475 | /* Protect against rescheduling. */ | |
973bd993 | 1476 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1477 | return; |
1478 | dasd_get_device(device); | |
1479 | tasklet_hi_schedule(&device->tasklet); | |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * Queue a request to the head of the ccw_queue. Start the I/O if | |
1484 | * possible. | |
1485 | */ | |
1486 | void | |
1487 | dasd_add_request_head(struct dasd_ccw_req *req) | |
1488 | { | |
1489 | struct dasd_device *device; | |
1490 | unsigned long flags; | |
1491 | ||
1492 | device = req->device; | |
1493 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1494 | req->status = DASD_CQR_QUEUED; | |
1495 | req->device = device; | |
1496 | list_add(&req->list, &device->ccw_queue); | |
1497 | /* let the bh start the request to keep them in order */ | |
1498 | dasd_schedule_bh(device); | |
1499 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | * Queue a request to the tail of the ccw_queue. Start the I/O if | |
1504 | * possible. | |
1505 | */ | |
1506 | void | |
1507 | dasd_add_request_tail(struct dasd_ccw_req *req) | |
1508 | { | |
1509 | struct dasd_device *device; | |
1510 | unsigned long flags; | |
1511 | ||
1512 | device = req->device; | |
1513 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1514 | req->status = DASD_CQR_QUEUED; | |
1515 | req->device = device; | |
1516 | list_add_tail(&req->list, &device->ccw_queue); | |
1517 | /* let the bh start the request to keep them in order */ | |
1518 | dasd_schedule_bh(device); | |
1519 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * Wakeup callback. | |
1524 | */ | |
1525 | static void | |
1526 | dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) | |
1527 | { | |
1528 | wake_up((wait_queue_head_t *) data); | |
1529 | } | |
1530 | ||
1531 | static inline int | |
1532 | _wait_for_wakeup(struct dasd_ccw_req *cqr) | |
1533 | { | |
1534 | struct dasd_device *device; | |
1535 | int rc; | |
1536 | ||
1537 | device = cqr->device; | |
1538 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1539 | rc = ((cqr->status == DASD_CQR_DONE || |
1540 | cqr->status == DASD_CQR_FAILED) && | |
1541 | list_empty(&cqr->list)); | |
1da177e4 LT |
1542 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1543 | return rc; | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * Attempts to start a special ccw queue and waits for its completion. | |
1548 | */ | |
1549 | int | |
1550 | dasd_sleep_on(struct dasd_ccw_req * cqr) | |
1551 | { | |
1552 | wait_queue_head_t wait_q; | |
1553 | struct dasd_device *device; | |
1554 | int rc; | |
138c014d | 1555 | |
1da177e4 LT |
1556 | device = cqr->device; |
1557 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
138c014d | 1558 | |
1da177e4 LT |
1559 | init_waitqueue_head (&wait_q); |
1560 | cqr->callback = dasd_wakeup_cb; | |
1561 | cqr->callback_data = (void *) &wait_q; | |
1562 | cqr->status = DASD_CQR_QUEUED; | |
1563 | list_add_tail(&cqr->list, &device->ccw_queue); | |
138c014d | 1564 | |
1da177e4 LT |
1565 | /* let the bh start the request to keep them in order */ |
1566 | dasd_schedule_bh(device); | |
138c014d | 1567 | |
1da177e4 LT |
1568 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1569 | ||
1570 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1571 | |
1da177e4 LT |
1572 | /* Request status is either done or failed. */ |
1573 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1574 | return rc; | |
1575 | } | |
1576 | ||
1577 | /* | |
1578 | * Attempts to start a special ccw queue and wait interruptible | |
1579 | * for its completion. | |
1580 | */ | |
1581 | int | |
1582 | dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) | |
1583 | { | |
1584 | wait_queue_head_t wait_q; | |
1585 | struct dasd_device *device; | |
1586 | int rc, finished; | |
1587 | ||
1588 | device = cqr->device; | |
1589 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1590 | ||
1591 | init_waitqueue_head (&wait_q); | |
1592 | cqr->callback = dasd_wakeup_cb; | |
1593 | cqr->callback_data = (void *) &wait_q; | |
1594 | cqr->status = DASD_CQR_QUEUED; | |
1595 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1596 | ||
1597 | /* let the bh start the request to keep them in order */ | |
1598 | dasd_schedule_bh(device); | |
1599 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1600 | ||
1601 | finished = 0; | |
1602 | while (!finished) { | |
1603 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); | |
1604 | if (rc != -ERESTARTSYS) { | |
c2ba444d HH |
1605 | /* Request is final (done or failed) */ |
1606 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1da177e4 LT |
1607 | break; |
1608 | } | |
1609 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1610 | switch (cqr->status) { |
1611 | case DASD_CQR_IN_IO: | |
1612 | /* terminate runnig cqr */ | |
1613 | if (device->discipline->term_IO) { | |
1614 | cqr->retries = -1; | |
1615 | device->discipline->term_IO(cqr); | |
8f61701b HH |
1616 | /* wait (non-interruptible) for final status |
1617 | * because signal ist still pending */ | |
c2ba444d HH |
1618 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1619 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1620 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1621 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1622 | finished = 1; | |
1623 | } | |
1624 | break; | |
1625 | case DASD_CQR_QUEUED: | |
1626 | /* request */ | |
1627 | list_del_init(&cqr->list); | |
1628 | rc = -EIO; | |
1da177e4 | 1629 | finished = 1; |
c2ba444d HH |
1630 | break; |
1631 | default: | |
1632 | /* cqr with 'non-interruptable' status - just wait */ | |
1633 | break; | |
1da177e4 LT |
1634 | } |
1635 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1636 | } | |
1637 | return rc; | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1642 | * for eckd devices) the currently running request has to be terminated | |
1643 | * and be put back to status queued, before the special request is added | |
1644 | * to the head of the queue. Then the special request is waited on normally. | |
1645 | */ | |
1646 | static inline int | |
1647 | _dasd_term_running_cqr(struct dasd_device *device) | |
1648 | { | |
1649 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1650 | |
1651 | if (list_empty(&device->ccw_queue)) | |
1652 | return 0; | |
1653 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
8f61701b | 1654 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1655 | } |
1656 | ||
1657 | int | |
1658 | dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) | |
1659 | { | |
1660 | wait_queue_head_t wait_q; | |
1661 | struct dasd_device *device; | |
1662 | int rc; | |
138c014d | 1663 | |
1da177e4 LT |
1664 | device = cqr->device; |
1665 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1666 | rc = _dasd_term_running_cqr(device); | |
1667 | if (rc) { | |
1668 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1669 | return rc; | |
1670 | } | |
138c014d | 1671 | |
1da177e4 LT |
1672 | init_waitqueue_head (&wait_q); |
1673 | cqr->callback = dasd_wakeup_cb; | |
1674 | cqr->callback_data = (void *) &wait_q; | |
1675 | cqr->status = DASD_CQR_QUEUED; | |
1676 | list_add(&cqr->list, &device->ccw_queue); | |
138c014d | 1677 | |
1da177e4 LT |
1678 | /* let the bh start the request to keep them in order */ |
1679 | dasd_schedule_bh(device); | |
138c014d | 1680 | |
1da177e4 LT |
1681 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1682 | ||
1683 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1684 | |
1da177e4 LT |
1685 | /* Request status is either done or failed. */ |
1686 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1687 | return rc; | |
1688 | } | |
1689 | ||
1690 | /* | |
1691 | * Cancels a request that was started with dasd_sleep_on_req. | |
1692 | * This is useful to timeout requests. The request will be | |
1693 | * terminated if it is currently in i/o. | |
1694 | * Returns 1 if the request has been terminated. | |
1695 | */ | |
1696 | int | |
1697 | dasd_cancel_req(struct dasd_ccw_req *cqr) | |
1698 | { | |
1699 | struct dasd_device *device = cqr->device; | |
1700 | unsigned long flags; | |
1701 | int rc; | |
1702 | ||
1703 | rc = 0; | |
1704 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1705 | switch (cqr->status) { | |
1706 | case DASD_CQR_QUEUED: | |
1707 | /* request was not started - just set to failed */ | |
1708 | cqr->status = DASD_CQR_FAILED; | |
1709 | break; | |
1710 | case DASD_CQR_IN_IO: | |
1711 | /* request in IO - terminate IO and release again */ | |
1712 | if (device->discipline->term_IO(cqr) != 0) | |
1713 | /* what to do if unable to terminate ?????? | |
1714 | e.g. not _IN_IO */ | |
1715 | cqr->status = DASD_CQR_FAILED; | |
1716 | cqr->stopclk = get_clock(); | |
1717 | rc = 1; | |
1718 | break; | |
1719 | case DASD_CQR_DONE: | |
1720 | case DASD_CQR_FAILED: | |
1721 | /* already finished - do nothing */ | |
1722 | break; | |
1723 | default: | |
1724 | DEV_MESSAGE(KERN_ALERT, device, | |
1725 | "invalid status %02x in request", | |
1726 | cqr->status); | |
1727 | BUG(); | |
1728 | ||
1729 | } | |
1730 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1731 | dasd_schedule_bh(device); | |
1732 | return rc; | |
1733 | } | |
1734 | ||
1735 | /* | |
1736 | * SECTION: Block device operations (request queue, partitions, open, release). | |
1737 | */ | |
1738 | ||
1739 | /* | |
1740 | * Dasd request queue function. Called from ll_rw_blk.c | |
1741 | */ | |
1742 | static void | |
165125e1 | 1743 | do_dasd_request(struct request_queue * queue) |
1da177e4 LT |
1744 | { |
1745 | struct dasd_device *device; | |
1746 | ||
1747 | device = (struct dasd_device *) queue->queuedata; | |
1748 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1749 | /* Get new request from the block device request queue */ | |
1750 | __dasd_process_blk_queue(device); | |
1751 | /* Now check if the head of the ccw queue needs to be started. */ | |
1752 | __dasd_start_head(device); | |
1753 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1754 | } | |
1755 | ||
1756 | /* | |
1757 | * Allocate and initialize request queue and default I/O scheduler. | |
1758 | */ | |
1759 | static int | |
1760 | dasd_alloc_queue(struct dasd_device * device) | |
1761 | { | |
1762 | int rc; | |
1763 | ||
1764 | device->request_queue = blk_init_queue(do_dasd_request, | |
1765 | &device->request_queue_lock); | |
1766 | if (device->request_queue == NULL) | |
1767 | return -ENOMEM; | |
1768 | ||
1769 | device->request_queue->queuedata = device; | |
1770 | ||
1771 | elevator_exit(device->request_queue->elevator); | |
1772 | rc = elevator_init(device->request_queue, "deadline"); | |
1773 | if (rc) { | |
1774 | blk_cleanup_queue(device->request_queue); | |
1775 | return rc; | |
1776 | } | |
1777 | return 0; | |
1778 | } | |
1779 | ||
1780 | /* | |
1781 | * Allocate and initialize request queue. | |
1782 | */ | |
1783 | static void | |
1784 | dasd_setup_queue(struct dasd_device * device) | |
1785 | { | |
1786 | int max; | |
1787 | ||
1788 | blk_queue_hardsect_size(device->request_queue, device->bp_block); | |
1789 | max = device->discipline->max_blocks << device->s2b_shift; | |
1790 | blk_queue_max_sectors(device->request_queue, max); | |
1791 | blk_queue_max_phys_segments(device->request_queue, -1L); | |
1792 | blk_queue_max_hw_segments(device->request_queue, -1L); | |
1793 | blk_queue_max_segment_size(device->request_queue, -1L); | |
1794 | blk_queue_segment_boundary(device->request_queue, -1L); | |
ed68cb36 | 1795 | blk_queue_ordered(device->request_queue, QUEUE_ORDERED_TAG, NULL); |
1da177e4 LT |
1796 | } |
1797 | ||
1798 | /* | |
1799 | * Deactivate and free request queue. | |
1800 | */ | |
1801 | static void | |
1802 | dasd_free_queue(struct dasd_device * device) | |
1803 | { | |
1804 | if (device->request_queue) { | |
1805 | blk_cleanup_queue(device->request_queue); | |
1806 | device->request_queue = NULL; | |
1807 | } | |
1808 | } | |
1809 | ||
1810 | /* | |
1811 | * Flush request on the request queue. | |
1812 | */ | |
1813 | static void | |
1814 | dasd_flush_request_queue(struct dasd_device * device) | |
1815 | { | |
1816 | struct request *req; | |
1817 | ||
1818 | if (!device->request_queue) | |
1819 | return; | |
138c014d | 1820 | |
1da177e4 | 1821 | spin_lock_irq(&device->request_queue_lock); |
8f61701b | 1822 | while ((req = elv_next_request(device->request_queue))) { |
1da177e4 | 1823 | blkdev_dequeue_request(req); |
ebc45999 | 1824 | dasd_end_request(req, 0); |
1da177e4 LT |
1825 | } |
1826 | spin_unlock_irq(&device->request_queue_lock); | |
1827 | } | |
1828 | ||
1829 | static int | |
1830 | dasd_open(struct inode *inp, struct file *filp) | |
1831 | { | |
1832 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1833 | struct dasd_device *device = disk->private_data; | |
1834 | int rc; | |
1835 | ||
1836 | atomic_inc(&device->open_count); | |
1837 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1838 | rc = -ENODEV; | |
1839 | goto unlock; | |
1840 | } | |
1841 | ||
1842 | if (!try_module_get(device->discipline->owner)) { | |
1843 | rc = -EINVAL; | |
1844 | goto unlock; | |
1845 | } | |
1846 | ||
1847 | if (dasd_probeonly) { | |
1848 | DEV_MESSAGE(KERN_INFO, device, "%s", | |
1849 | "No access to device due to probeonly mode"); | |
1850 | rc = -EPERM; | |
1851 | goto out; | |
1852 | } | |
1853 | ||
90f0094d | 1854 | if (device->state <= DASD_STATE_BASIC) { |
1da177e4 LT |
1855 | DBF_DEV_EVENT(DBF_ERR, device, " %s", |
1856 | " Cannot open unrecognized device"); | |
1857 | rc = -ENODEV; | |
1858 | goto out; | |
1859 | } | |
1860 | ||
1861 | return 0; | |
1862 | ||
1863 | out: | |
1864 | module_put(device->discipline->owner); | |
1865 | unlock: | |
1866 | atomic_dec(&device->open_count); | |
1867 | return rc; | |
1868 | } | |
1869 | ||
1870 | static int | |
1871 | dasd_release(struct inode *inp, struct file *filp) | |
1872 | { | |
1873 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1874 | struct dasd_device *device = disk->private_data; | |
1875 | ||
1876 | atomic_dec(&device->open_count); | |
1877 | module_put(device->discipline->owner); | |
1878 | return 0; | |
1879 | } | |
1880 | ||
a885c8c4 CH |
1881 | /* |
1882 | * Return disk geometry. | |
1883 | */ | |
1884 | static int | |
1885 | dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1886 | { | |
1887 | struct dasd_device *device; | |
1888 | ||
1889 | device = bdev->bd_disk->private_data; | |
1890 | if (!device) | |
1891 | return -ENODEV; | |
1892 | ||
1893 | if (!device->discipline || | |
1894 | !device->discipline->fill_geometry) | |
1895 | return -EINVAL; | |
1896 | ||
1897 | device->discipline->fill_geometry(device, geo); | |
1898 | geo->start = get_start_sect(bdev) >> device->s2b_shift; | |
1899 | return 0; | |
1900 | } | |
1901 | ||
1da177e4 LT |
1902 | struct block_device_operations |
1903 | dasd_device_operations = { | |
1904 | .owner = THIS_MODULE, | |
1905 | .open = dasd_open, | |
1906 | .release = dasd_release, | |
1907 | .ioctl = dasd_ioctl, | |
8262037f | 1908 | .compat_ioctl = dasd_compat_ioctl, |
a885c8c4 | 1909 | .getgeo = dasd_getgeo, |
1da177e4 LT |
1910 | }; |
1911 | ||
1912 | ||
1913 | static void | |
1914 | dasd_exit(void) | |
1915 | { | |
1916 | #ifdef CONFIG_PROC_FS | |
1917 | dasd_proc_exit(); | |
1918 | #endif | |
20c64468 | 1919 | dasd_eer_exit(); |
6bb0e010 HH |
1920 | if (dasd_page_cache != NULL) { |
1921 | kmem_cache_destroy(dasd_page_cache); | |
1922 | dasd_page_cache = NULL; | |
1923 | } | |
1da177e4 LT |
1924 | dasd_gendisk_exit(); |
1925 | dasd_devmap_exit(); | |
1da177e4 LT |
1926 | if (dasd_debug_area != NULL) { |
1927 | debug_unregister(dasd_debug_area); | |
1928 | dasd_debug_area = NULL; | |
1929 | } | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * SECTION: common functions for ccw_driver use | |
1934 | */ | |
1935 | ||
1c01b8a5 HH |
1936 | /* |
1937 | * Initial attempt at a probe function. this can be simplified once | |
1938 | * the other detection code is gone. | |
1939 | */ | |
1da177e4 LT |
1940 | int |
1941 | dasd_generic_probe (struct ccw_device *cdev, | |
1942 | struct dasd_discipline *discipline) | |
1943 | { | |
1944 | int ret; | |
1945 | ||
40545573 HH |
1946 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
1947 | if (ret) { | |
1948 | printk(KERN_WARNING | |
1949 | "dasd_generic_probe: could not set ccw-device options " | |
1950 | "for %s\n", cdev->dev.bus_id); | |
1951 | return ret; | |
1952 | } | |
1da177e4 LT |
1953 | ret = dasd_add_sysfs_files(cdev); |
1954 | if (ret) { | |
1955 | printk(KERN_WARNING | |
1956 | "dasd_generic_probe: could not add sysfs entries " | |
1957 | "for %s\n", cdev->dev.bus_id); | |
40545573 | 1958 | return ret; |
1da177e4 | 1959 | } |
40545573 | 1960 | cdev->handler = &dasd_int_handler; |
1da177e4 | 1961 | |
40545573 HH |
1962 | /* |
1963 | * Automatically online either all dasd devices (dasd_autodetect) | |
1964 | * or all devices specified with dasd= parameters during | |
1965 | * initial probe. | |
1966 | */ | |
1967 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
1968 | (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0)) | |
1969 | ret = ccw_device_set_online(cdev); | |
1970 | if (ret) | |
1971 | printk(KERN_WARNING | |
1972 | "dasd_generic_probe: could not initially online " | |
1973 | "ccw-device %s\n", cdev->dev.bus_id); | |
1da177e4 LT |
1974 | return ret; |
1975 | } | |
1976 | ||
1c01b8a5 HH |
1977 | /* |
1978 | * This will one day be called from a global not_oper handler. | |
1979 | * It is also used by driver_unregister during module unload. | |
1980 | */ | |
1da177e4 LT |
1981 | void |
1982 | dasd_generic_remove (struct ccw_device *cdev) | |
1983 | { | |
1984 | struct dasd_device *device; | |
1985 | ||
59afda78 HH |
1986 | cdev->handler = NULL; |
1987 | ||
1da177e4 LT |
1988 | dasd_remove_sysfs_files(cdev); |
1989 | device = dasd_device_from_cdev(cdev); | |
1990 | if (IS_ERR(device)) | |
1991 | return; | |
1992 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1993 | /* Already doing offline processing */ | |
1994 | dasd_put_device(device); | |
1995 | return; | |
1996 | } | |
1997 | /* | |
1998 | * This device is removed unconditionally. Set offline | |
1999 | * flag to prevent dasd_open from opening it while it is | |
2000 | * no quite down yet. | |
2001 | */ | |
2002 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2003 | /* dasd_delete_device destroys the device reference. */ | |
2004 | dasd_delete_device(device); | |
2005 | } | |
2006 | ||
1c01b8a5 HH |
2007 | /* |
2008 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2009 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2010 | * or the user has started activation through sysfs. |
2011 | */ | |
1da177e4 LT |
2012 | int |
2013 | dasd_generic_set_online (struct ccw_device *cdev, | |
aa88861f | 2014 | struct dasd_discipline *base_discipline) |
1da177e4 LT |
2015 | |
2016 | { | |
aa88861f | 2017 | struct dasd_discipline *discipline; |
1da177e4 | 2018 | struct dasd_device *device; |
c6eb7b77 | 2019 | int rc; |
f24acd45 | 2020 | |
40545573 HH |
2021 | /* first online clears initial online feature flag */ |
2022 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2023 | device = dasd_create_device(cdev); |
2024 | if (IS_ERR(device)) | |
2025 | return PTR_ERR(device); | |
2026 | ||
aa88861f | 2027 | discipline = base_discipline; |
c6eb7b77 | 2028 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
2029 | if (!dasd_diag_discipline_pointer) { |
2030 | printk (KERN_WARNING | |
2031 | "dasd_generic couldn't online device %s " | |
2032 | "- discipline DIAG not available\n", | |
2033 | cdev->dev.bus_id); | |
2034 | dasd_delete_device(device); | |
2035 | return -ENODEV; | |
2036 | } | |
2037 | discipline = dasd_diag_discipline_pointer; | |
2038 | } | |
aa88861f PO |
2039 | if (!try_module_get(base_discipline->owner)) { |
2040 | dasd_delete_device(device); | |
2041 | return -EINVAL; | |
2042 | } | |
2043 | if (!try_module_get(discipline->owner)) { | |
2044 | module_put(base_discipline->owner); | |
2045 | dasd_delete_device(device); | |
2046 | return -EINVAL; | |
2047 | } | |
2048 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2049 | device->discipline = discipline; |
2050 | ||
2051 | rc = discipline->check_device(device); | |
2052 | if (rc) { | |
2053 | printk (KERN_WARNING | |
2054 | "dasd_generic couldn't online device %s " | |
2055 | "with discipline %s rc=%i\n", | |
2056 | cdev->dev.bus_id, discipline->name, rc); | |
aa88861f PO |
2057 | module_put(discipline->owner); |
2058 | module_put(base_discipline->owner); | |
1da177e4 LT |
2059 | dasd_delete_device(device); |
2060 | return rc; | |
2061 | } | |
2062 | ||
2063 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2064 | if (device->state <= DASD_STATE_KNOWN) { | |
2065 | printk (KERN_WARNING | |
2066 | "dasd_generic discipline not found for %s\n", | |
2067 | cdev->dev.bus_id); | |
2068 | rc = -ENODEV; | |
2069 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2070 | dasd_delete_device(device); | |
2071 | } else | |
2072 | pr_debug("dasd_generic device %s found\n", | |
2073 | cdev->dev.bus_id); | |
2074 | ||
2075 | /* FIXME: we have to wait for the root device but we don't want | |
2076 | * to wait for each single device but for all at once. */ | |
2077 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2078 | ||
2079 | dasd_put_device(device); | |
2080 | ||
2081 | return rc; | |
2082 | } | |
2083 | ||
2084 | int | |
2085 | dasd_generic_set_offline (struct ccw_device *cdev) | |
2086 | { | |
2087 | struct dasd_device *device; | |
dafd87aa | 2088 | int max_count, open_count; |
1da177e4 LT |
2089 | |
2090 | device = dasd_device_from_cdev(cdev); | |
2091 | if (IS_ERR(device)) | |
2092 | return PTR_ERR(device); | |
2093 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2094 | /* Already doing offline processing */ | |
2095 | dasd_put_device(device); | |
2096 | return 0; | |
2097 | } | |
2098 | /* | |
2099 | * We must make sure that this device is currently not in use. | |
2100 | * The open_count is increased for every opener, that includes | |
2101 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2102 | * in the other openers. | |
2103 | */ | |
2104 | max_count = device->bdev ? 0 : -1; | |
dafd87aa HH |
2105 | open_count = (int) atomic_read(&device->open_count); |
2106 | if (open_count > max_count) { | |
2107 | if (open_count > 0) | |
2108 | printk (KERN_WARNING "Can't offline dasd device with " | |
2109 | "open count = %i.\n", | |
2110 | open_count); | |
2111 | else | |
2112 | printk (KERN_WARNING "%s", | |
2113 | "Can't offline dasd device due to internal " | |
2114 | "use\n"); | |
1da177e4 LT |
2115 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2116 | dasd_put_device(device); | |
2117 | return -EBUSY; | |
2118 | } | |
2119 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2120 | /* dasd_delete_device destroys the device reference. */ | |
2121 | dasd_delete_device(device); | |
2122 | ||
2123 | return 0; | |
2124 | } | |
2125 | ||
2126 | int | |
2127 | dasd_generic_notify(struct ccw_device *cdev, int event) | |
2128 | { | |
2129 | struct dasd_device *device; | |
2130 | struct dasd_ccw_req *cqr; | |
2131 | unsigned long flags; | |
2132 | int ret; | |
2133 | ||
2134 | device = dasd_device_from_cdev(cdev); | |
2135 | if (IS_ERR(device)) | |
2136 | return 0; | |
2137 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
2138 | ret = 0; | |
2139 | switch (event) { | |
2140 | case CIO_GONE: | |
2141 | case CIO_NO_PATH: | |
20c64468 SW |
2142 | /* First of all call extended error reporting. */ |
2143 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2144 | ||
1da177e4 LT |
2145 | if (device->state < DASD_STATE_BASIC) |
2146 | break; | |
2147 | /* Device is active. We want to keep it. */ | |
2148 | if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) { | |
2149 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2150 | if (cqr->status == DASD_CQR_IN_IO) | |
2151 | cqr->status = DASD_CQR_FAILED; | |
2152 | device->stopped |= DASD_STOPPED_DC_EIO; | |
1da177e4 LT |
2153 | } else { |
2154 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2155 | if (cqr->status == DASD_CQR_IN_IO) { | |
2156 | cqr->status = DASD_CQR_QUEUED; | |
2157 | cqr->retries++; | |
2158 | } | |
2159 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2160 | dasd_set_timer(device, 0); | |
2161 | } | |
1c01b8a5 | 2162 | dasd_schedule_bh(device); |
1da177e4 LT |
2163 | ret = 1; |
2164 | break; | |
2165 | case CIO_OPER: | |
2166 | /* FIXME: add a sanity check. */ | |
2167 | device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO); | |
2168 | dasd_schedule_bh(device); | |
2169 | ret = 1; | |
2170 | break; | |
2171 | } | |
2172 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
2173 | dasd_put_device(device); | |
2174 | return ret; | |
2175 | } | |
2176 | ||
763968e2 HC |
2177 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2178 | void *rdc_buffer, | |
2179 | int rdc_buffer_size, | |
2180 | char *magic) | |
17283b56 CH |
2181 | { |
2182 | struct dasd_ccw_req *cqr; | |
2183 | struct ccw1 *ccw; | |
2184 | ||
2185 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2186 | ||
2187 | if (IS_ERR(cqr)) { | |
2188 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
2189 | "Could not allocate RDC request"); | |
2190 | return cqr; | |
2191 | } | |
2192 | ||
2193 | ccw = cqr->cpaddr; | |
2194 | ccw->cmd_code = CCW_CMD_RDC; | |
2195 | ccw->cda = (__u32)(addr_t)rdc_buffer; | |
2196 | ccw->count = rdc_buffer_size; | |
2197 | ||
2198 | cqr->device = device; | |
2199 | cqr->expires = 10*HZ; | |
2200 | clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
2201 | cqr->retries = 2; | |
2202 | cqr->buildclk = get_clock(); | |
2203 | cqr->status = DASD_CQR_FILLED; | |
2204 | return cqr; | |
2205 | } | |
2206 | ||
2207 | ||
2208 | int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic, | |
2209 | void **rdc_buffer, int rdc_buffer_size) | |
2210 | { | |
2211 | int ret; | |
2212 | struct dasd_ccw_req *cqr; | |
2213 | ||
2214 | cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size, | |
2215 | magic); | |
2216 | if (IS_ERR(cqr)) | |
2217 | return PTR_ERR(cqr); | |
2218 | ||
2219 | ret = dasd_sleep_on(cqr); | |
2220 | dasd_sfree_request(cqr, cqr->device); | |
2221 | return ret; | |
2222 | } | |
aaff0f64 | 2223 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2224 | |
1da177e4 LT |
2225 | static int __init |
2226 | dasd_init(void) | |
2227 | { | |
2228 | int rc; | |
2229 | ||
2230 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2231 | init_waitqueue_head(&dasd_flush_wq); |
1da177e4 LT |
2232 | |
2233 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
66a464db | 2234 | dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long)); |
1da177e4 LT |
2235 | if (dasd_debug_area == NULL) { |
2236 | rc = -ENOMEM; | |
2237 | goto failed; | |
2238 | } | |
2239 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2240 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2241 | |
2242 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2243 | ||
2244 | dasd_diag_discipline_pointer = NULL; | |
2245 | ||
1da177e4 LT |
2246 | rc = dasd_devmap_init(); |
2247 | if (rc) | |
2248 | goto failed; | |
2249 | rc = dasd_gendisk_init(); | |
2250 | if (rc) | |
2251 | goto failed; | |
2252 | rc = dasd_parse(); | |
2253 | if (rc) | |
2254 | goto failed; | |
20c64468 SW |
2255 | rc = dasd_eer_init(); |
2256 | if (rc) | |
2257 | goto failed; | |
1da177e4 LT |
2258 | #ifdef CONFIG_PROC_FS |
2259 | rc = dasd_proc_init(); | |
2260 | if (rc) | |
2261 | goto failed; | |
2262 | #endif | |
2263 | ||
2264 | return 0; | |
2265 | failed: | |
2266 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2267 | dasd_exit(); | |
2268 | return rc; | |
2269 | } | |
2270 | ||
2271 | module_init(dasd_init); | |
2272 | module_exit(dasd_exit); | |
2273 | ||
2274 | EXPORT_SYMBOL(dasd_debug_area); | |
2275 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2276 | ||
2277 | EXPORT_SYMBOL(dasd_add_request_head); | |
2278 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2279 | EXPORT_SYMBOL(dasd_cancel_req); | |
2280 | EXPORT_SYMBOL(dasd_clear_timer); | |
2281 | EXPORT_SYMBOL(dasd_enable_device); | |
2282 | EXPORT_SYMBOL(dasd_int_handler); | |
2283 | EXPORT_SYMBOL(dasd_kfree_request); | |
2284 | EXPORT_SYMBOL(dasd_kick_device); | |
2285 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
2286 | EXPORT_SYMBOL(dasd_schedule_bh); | |
2287 | EXPORT_SYMBOL(dasd_set_target_state); | |
2288 | EXPORT_SYMBOL(dasd_set_timer); | |
2289 | EXPORT_SYMBOL(dasd_sfree_request); | |
2290 | EXPORT_SYMBOL(dasd_sleep_on); | |
2291 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2292 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2293 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2294 | EXPORT_SYMBOL(dasd_start_IO); | |
2295 | EXPORT_SYMBOL(dasd_term_IO); | |
2296 | ||
2297 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2298 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2299 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2300 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2301 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
1da177e4 | 2302 |