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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/kmod.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/ctype.h> | |
16 | #include <linux/major.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/buffer_head.h> | |
a885c8c4 | 19 | #include <linux/hdreg.h> |
1da177e4 LT |
20 | |
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/ebcdic.h> | |
23 | #include <asm/idals.h> | |
24 | #include <asm/todclk.h> | |
25 | ||
26 | /* This is ugly... */ | |
27 | #define PRINTK_HEADER "dasd:" | |
28 | ||
29 | #include "dasd_int.h" | |
30 | /* | |
31 | * SECTION: Constant definitions to be used within this file | |
32 | */ | |
33 | #define DASD_CHANQ_MAX_SIZE 4 | |
34 | ||
35 | /* | |
36 | * SECTION: exported variables of dasd.c | |
37 | */ | |
38 | debug_info_t *dasd_debug_area; | |
39 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
40 | ||
41 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
42 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
43 | " Copyright 2000 IBM Corporation"); | |
44 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
45 | MODULE_LICENSE("GPL"); |
46 | ||
47 | /* | |
48 | * SECTION: prototypes for static functions of dasd.c | |
49 | */ | |
50 | static int dasd_alloc_queue(struct dasd_device * device); | |
51 | static void dasd_setup_queue(struct dasd_device * device); | |
52 | static void dasd_free_queue(struct dasd_device * device); | |
53 | static void dasd_flush_request_queue(struct dasd_device *); | |
54 | static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); | |
55 | static void dasd_flush_ccw_queue(struct dasd_device *, int); | |
56 | static void dasd_tasklet(struct dasd_device *); | |
57 | static void do_kick_device(void *data); | |
58 | ||
59 | /* | |
60 | * SECTION: Operations on the device structure. | |
61 | */ | |
62 | static wait_queue_head_t dasd_init_waitq; | |
63 | ||
64 | /* | |
65 | * Allocate memory for a new device structure. | |
66 | */ | |
67 | struct dasd_device * | |
68 | dasd_alloc_device(void) | |
69 | { | |
70 | struct dasd_device *device; | |
71 | ||
88abaab4 | 72 | device = kzalloc(sizeof (struct dasd_device), GFP_ATOMIC); |
1da177e4 LT |
73 | if (device == NULL) |
74 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
75 | /* open_count = 0 means device online but not in use */ |
76 | atomic_set(&device->open_count, -1); | |
77 | ||
78 | /* Get two pages for normal block device operations. */ | |
79 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
80 | if (device->ccw_mem == NULL) { | |
81 | kfree(device); | |
82 | return ERR_PTR(-ENOMEM); | |
83 | } | |
84 | /* Get one page for error recovery. */ | |
85 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
86 | if (device->erp_mem == NULL) { | |
87 | free_pages((unsigned long) device->ccw_mem, 1); | |
88 | kfree(device); | |
89 | return ERR_PTR(-ENOMEM); | |
90 | } | |
91 | ||
92 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
93 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
94 | spin_lock_init(&device->mem_lock); | |
95 | spin_lock_init(&device->request_queue_lock); | |
96 | atomic_set (&device->tasklet_scheduled, 0); | |
138c014d | 97 | tasklet_init(&device->tasklet, |
1da177e4 LT |
98 | (void (*)(unsigned long)) dasd_tasklet, |
99 | (unsigned long) device); | |
100 | INIT_LIST_HEAD(&device->ccw_queue); | |
101 | init_timer(&device->timer); | |
102 | INIT_WORK(&device->kick_work, do_kick_device, device); | |
103 | device->state = DASD_STATE_NEW; | |
104 | device->target = DASD_STATE_NEW; | |
105 | ||
106 | return device; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Free memory of a device structure. | |
111 | */ | |
112 | void | |
113 | dasd_free_device(struct dasd_device *device) | |
114 | { | |
17fd682e | 115 | kfree(device->private); |
1da177e4 LT |
116 | free_page((unsigned long) device->erp_mem); |
117 | free_pages((unsigned long) device->ccw_mem, 1); | |
118 | kfree(device); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Make a new device known to the system. | |
123 | */ | |
124 | static inline int | |
125 | dasd_state_new_to_known(struct dasd_device *device) | |
126 | { | |
127 | int rc; | |
128 | ||
129 | /* | |
138c014d | 130 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
131 | * keep the reference count > 0. |
132 | */ | |
133 | dasd_get_device(device); | |
134 | ||
135 | rc = dasd_alloc_queue(device); | |
136 | if (rc) { | |
137 | dasd_put_device(device); | |
138 | return rc; | |
139 | } | |
140 | ||
141 | device->state = DASD_STATE_KNOWN; | |
142 | return 0; | |
143 | } | |
144 | ||
145 | /* | |
146 | * Let the system forget about a device. | |
147 | */ | |
148 | static inline void | |
149 | dasd_state_known_to_new(struct dasd_device * device) | |
150 | { | |
20c64468 SW |
151 | /* Disable extended error reporting for this device. */ |
152 | dasd_eer_disable(device); | |
1da177e4 | 153 | /* Forget the discipline information. */ |
aa88861f PO |
154 | if (device->discipline) |
155 | module_put(device->discipline->owner); | |
1da177e4 | 156 | device->discipline = NULL; |
aa88861f PO |
157 | if (device->base_discipline) |
158 | module_put(device->base_discipline->owner); | |
159 | device->base_discipline = NULL; | |
1da177e4 LT |
160 | device->state = DASD_STATE_NEW; |
161 | ||
162 | dasd_free_queue(device); | |
163 | ||
164 | /* Give up reference we took in dasd_state_new_to_known. */ | |
165 | dasd_put_device(device); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Request the irq line for the device. | |
170 | */ | |
171 | static inline int | |
172 | dasd_state_known_to_basic(struct dasd_device * device) | |
173 | { | |
174 | int rc; | |
175 | ||
176 | /* Allocate and register gendisk structure. */ | |
177 | rc = dasd_gendisk_alloc(device); | |
178 | if (rc) | |
179 | return rc; | |
180 | ||
181 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ | |
66a464db | 182 | device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 2, |
1da177e4 LT |
183 | 8 * sizeof (long)); |
184 | debug_register_view(device->debug_area, &debug_sprintf_view); | |
185 | debug_set_level(device->debug_area, DBF_EMERG); | |
186 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); | |
187 | ||
188 | device->state = DASD_STATE_BASIC; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Release the irq line for the device. Terminate any running i/o. | |
194 | */ | |
195 | static inline void | |
196 | dasd_state_basic_to_known(struct dasd_device * device) | |
197 | { | |
198 | dasd_gendisk_free(device); | |
199 | dasd_flush_ccw_queue(device, 1); | |
200 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); | |
201 | if (device->debug_area != NULL) { | |
202 | debug_unregister(device->debug_area); | |
203 | device->debug_area = NULL; | |
204 | } | |
205 | device->state = DASD_STATE_KNOWN; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Do the initial analysis. The do_analysis function may return | |
210 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
211 | * until the discipline decides to continue the startup sequence | |
212 | * by calling the function dasd_change_state. The eckd disciplines | |
213 | * uses this to start a ccw that detects the format. The completion | |
214 | * interrupt for this detection ccw uses the kernel event daemon to | |
215 | * trigger the call to dasd_change_state. All this is done in the | |
216 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
217 | * After the analysis ccw is done (do_analysis returned 0) the block |
218 | * device is setup. | |
219 | * In case the analysis returns an error, the device setup is stopped | |
220 | * (a fake disk was already added to allow formatting). | |
1da177e4 LT |
221 | */ |
222 | static inline int | |
223 | dasd_state_basic_to_ready(struct dasd_device * device) | |
224 | { | |
225 | int rc; | |
226 | ||
227 | rc = 0; | |
228 | if (device->discipline->do_analysis != NULL) | |
229 | rc = device->discipline->do_analysis(device); | |
90f0094d HH |
230 | if (rc) { |
231 | if (rc != -EAGAIN) | |
232 | device->state = DASD_STATE_UNFMT; | |
1da177e4 | 233 | return rc; |
90f0094d HH |
234 | } |
235 | /* make disk known with correct capacity */ | |
1da177e4 | 236 | dasd_setup_queue(device); |
90f0094d | 237 | set_capacity(device->gdp, device->blocks << device->s2b_shift); |
1da177e4 | 238 | device->state = DASD_STATE_READY; |
90f0094d HH |
239 | rc = dasd_scan_partitions(device); |
240 | if (rc) | |
1da177e4 | 241 | device->state = DASD_STATE_BASIC; |
90f0094d | 242 | return rc; |
1da177e4 LT |
243 | } |
244 | ||
245 | /* | |
246 | * Remove device from block device layer. Destroy dirty buffers. | |
247 | * Forget format information. Check if the target level is basic | |
248 | * and if it is create fake disk for formatting. | |
249 | */ | |
250 | static inline void | |
251 | dasd_state_ready_to_basic(struct dasd_device * device) | |
252 | { | |
253 | dasd_flush_ccw_queue(device, 0); | |
254 | dasd_destroy_partitions(device); | |
255 | dasd_flush_request_queue(device); | |
256 | device->blocks = 0; | |
257 | device->bp_block = 0; | |
258 | device->s2b_shift = 0; | |
259 | device->state = DASD_STATE_BASIC; | |
260 | } | |
261 | ||
90f0094d HH |
262 | /* |
263 | * Back to basic. | |
264 | */ | |
265 | static inline void | |
266 | dasd_state_unfmt_to_basic(struct dasd_device * device) | |
267 | { | |
268 | device->state = DASD_STATE_BASIC; | |
269 | } | |
270 | ||
1da177e4 LT |
271 | /* |
272 | * Make the device online and schedule the bottom half to start | |
273 | * the requeueing of requests from the linux request queue to the | |
274 | * ccw queue. | |
275 | */ | |
276 | static inline int | |
277 | dasd_state_ready_to_online(struct dasd_device * device) | |
278 | { | |
279 | device->state = DASD_STATE_ONLINE; | |
280 | dasd_schedule_bh(device); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | /* | |
285 | * Stop the requeueing of requests again. | |
286 | */ | |
287 | static inline void | |
288 | dasd_state_online_to_ready(struct dasd_device * device) | |
289 | { | |
290 | device->state = DASD_STATE_READY; | |
291 | } | |
292 | ||
293 | /* | |
294 | * Device startup state changes. | |
295 | */ | |
296 | static inline int | |
297 | dasd_increase_state(struct dasd_device *device) | |
298 | { | |
299 | int rc; | |
300 | ||
301 | rc = 0; | |
302 | if (device->state == DASD_STATE_NEW && | |
303 | device->target >= DASD_STATE_KNOWN) | |
304 | rc = dasd_state_new_to_known(device); | |
305 | ||
306 | if (!rc && | |
307 | device->state == DASD_STATE_KNOWN && | |
308 | device->target >= DASD_STATE_BASIC) | |
309 | rc = dasd_state_known_to_basic(device); | |
310 | ||
311 | if (!rc && | |
312 | device->state == DASD_STATE_BASIC && | |
313 | device->target >= DASD_STATE_READY) | |
314 | rc = dasd_state_basic_to_ready(device); | |
315 | ||
39ccf95e HH |
316 | if (!rc && |
317 | device->state == DASD_STATE_UNFMT && | |
318 | device->target > DASD_STATE_UNFMT) | |
319 | rc = -EPERM; | |
320 | ||
1da177e4 LT |
321 | if (!rc && |
322 | device->state == DASD_STATE_READY && | |
323 | device->target >= DASD_STATE_ONLINE) | |
324 | rc = dasd_state_ready_to_online(device); | |
325 | ||
326 | return rc; | |
327 | } | |
328 | ||
329 | /* | |
330 | * Device shutdown state changes. | |
331 | */ | |
332 | static inline int | |
333 | dasd_decrease_state(struct dasd_device *device) | |
334 | { | |
335 | if (device->state == DASD_STATE_ONLINE && | |
336 | device->target <= DASD_STATE_READY) | |
337 | dasd_state_online_to_ready(device); | |
138c014d | 338 | |
1da177e4 LT |
339 | if (device->state == DASD_STATE_READY && |
340 | device->target <= DASD_STATE_BASIC) | |
341 | dasd_state_ready_to_basic(device); | |
90f0094d HH |
342 | |
343 | if (device->state == DASD_STATE_UNFMT && | |
344 | device->target <= DASD_STATE_BASIC) | |
345 | dasd_state_unfmt_to_basic(device); | |
346 | ||
347 | if (device->state == DASD_STATE_BASIC && | |
1da177e4 LT |
348 | device->target <= DASD_STATE_KNOWN) |
349 | dasd_state_basic_to_known(device); | |
138c014d | 350 | |
1da177e4 LT |
351 | if (device->state == DASD_STATE_KNOWN && |
352 | device->target <= DASD_STATE_NEW) | |
353 | dasd_state_known_to_new(device); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | /* | |
359 | * This is the main startup/shutdown routine. | |
360 | */ | |
361 | static void | |
362 | dasd_change_state(struct dasd_device *device) | |
363 | { | |
364 | int rc; | |
365 | ||
366 | if (device->state == device->target) | |
367 | /* Already where we want to go today... */ | |
368 | return; | |
369 | if (device->state < device->target) | |
370 | rc = dasd_increase_state(device); | |
371 | else | |
372 | rc = dasd_decrease_state(device); | |
373 | if (rc && rc != -EAGAIN) | |
374 | device->target = device->state; | |
375 | ||
376 | if (device->state == device->target) | |
377 | wake_up(&dasd_init_waitq); | |
378 | } | |
379 | ||
380 | /* | |
381 | * Kick starter for devices that did not complete the startup/shutdown | |
382 | * procedure or were sleeping because of a pending state. | |
383 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
384 | * event daemon. | |
385 | */ | |
386 | static void | |
387 | do_kick_device(void *data) | |
388 | { | |
389 | struct dasd_device *device; | |
390 | ||
391 | device = (struct dasd_device *) data; | |
392 | dasd_change_state(device); | |
393 | dasd_schedule_bh(device); | |
394 | dasd_put_device(device); | |
395 | } | |
396 | ||
397 | void | |
398 | dasd_kick_device(struct dasd_device *device) | |
399 | { | |
400 | dasd_get_device(device); | |
401 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
402 | schedule_work(&device->kick_work); | |
403 | } | |
404 | ||
405 | /* | |
406 | * Set the target state for a device and starts the state change. | |
407 | */ | |
408 | void | |
409 | dasd_set_target_state(struct dasd_device *device, int target) | |
410 | { | |
411 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
412 | if (dasd_probeonly && target > DASD_STATE_READY) | |
413 | target = DASD_STATE_READY; | |
414 | if (device->target != target) { | |
415 | if (device->state == target) | |
416 | wake_up(&dasd_init_waitq); | |
417 | device->target = target; | |
418 | } | |
419 | if (device->state != device->target) | |
420 | dasd_change_state(device); | |
421 | } | |
422 | ||
423 | /* | |
424 | * Enable devices with device numbers in [from..to]. | |
425 | */ | |
426 | static inline int | |
427 | _wait_for_device(struct dasd_device *device) | |
428 | { | |
429 | return (device->state == device->target); | |
430 | } | |
431 | ||
432 | void | |
433 | dasd_enable_device(struct dasd_device *device) | |
434 | { | |
435 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
436 | if (device->state <= DASD_STATE_KNOWN) | |
437 | /* No discipline for device found. */ | |
438 | dasd_set_target_state(device, DASD_STATE_NEW); | |
439 | /* Now wait for the devices to come up. */ | |
440 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
441 | } | |
442 | ||
443 | /* | |
444 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
445 | */ | |
446 | #ifdef CONFIG_DASD_PROFILE | |
447 | ||
448 | struct dasd_profile_info_t dasd_global_profile; | |
449 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
450 | ||
451 | /* | |
452 | * Increments counter in global and local profiling structures. | |
453 | */ | |
454 | #define dasd_profile_counter(value, counter, device) \ | |
455 | { \ | |
456 | int index; \ | |
457 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
458 | dasd_global_profile.counter[index]++; \ | |
459 | device->profile.counter[index]++; \ | |
460 | } | |
461 | ||
462 | /* | |
463 | * Add profiling information for cqr before execution. | |
464 | */ | |
465 | static inline void | |
466 | dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
467 | struct request *req) | |
468 | { | |
469 | struct list_head *l; | |
470 | unsigned int counter; | |
471 | ||
472 | if (dasd_profile_level != DASD_PROFILE_ON) | |
473 | return; | |
474 | ||
475 | /* count the length of the chanq for statistics */ | |
476 | counter = 0; | |
477 | list_for_each(l, &device->ccw_queue) | |
478 | if (++counter >= 31) | |
479 | break; | |
480 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
481 | device->profile.dasd_io_nr_req[counter]++; | |
482 | } | |
483 | ||
484 | /* | |
485 | * Add profiling information for cqr after execution. | |
486 | */ | |
487 | static inline void | |
488 | dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
489 | struct request *req) | |
490 | { | |
491 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
492 | long tottimeps, sectors; | |
493 | ||
494 | if (dasd_profile_level != DASD_PROFILE_ON) | |
495 | return; | |
496 | ||
497 | sectors = req->nr_sectors; | |
498 | if (!cqr->buildclk || !cqr->startclk || | |
499 | !cqr->stopclk || !cqr->endclk || | |
500 | !sectors) | |
501 | return; | |
502 | ||
503 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
504 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
505 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
506 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
507 | tottimeps = tottime / sectors; | |
508 | ||
509 | if (!dasd_global_profile.dasd_io_reqs) | |
510 | memset(&dasd_global_profile, 0, | |
511 | sizeof (struct dasd_profile_info_t)); | |
512 | dasd_global_profile.dasd_io_reqs++; | |
513 | dasd_global_profile.dasd_io_sects += sectors; | |
514 | ||
515 | if (!device->profile.dasd_io_reqs) | |
516 | memset(&device->profile, 0, | |
517 | sizeof (struct dasd_profile_info_t)); | |
518 | device->profile.dasd_io_reqs++; | |
519 | device->profile.dasd_io_sects += sectors; | |
520 | ||
521 | dasd_profile_counter(sectors, dasd_io_secs, device); | |
522 | dasd_profile_counter(tottime, dasd_io_times, device); | |
523 | dasd_profile_counter(tottimeps, dasd_io_timps, device); | |
524 | dasd_profile_counter(strtime, dasd_io_time1, device); | |
525 | dasd_profile_counter(irqtime, dasd_io_time2, device); | |
526 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device); | |
527 | dasd_profile_counter(endtime, dasd_io_time3, device); | |
528 | } | |
529 | #else | |
530 | #define dasd_profile_start(device, cqr, req) do {} while (0) | |
531 | #define dasd_profile_end(device, cqr, req) do {} while (0) | |
532 | #endif /* CONFIG_DASD_PROFILE */ | |
533 | ||
534 | /* | |
535 | * Allocate memory for a channel program with 'cplength' channel | |
536 | * command words and 'datasize' additional space. There are two | |
537 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
538 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
539 | * that gets allocated for each device. | |
540 | */ | |
541 | struct dasd_ccw_req * | |
542 | dasd_kmalloc_request(char *magic, int cplength, int datasize, | |
543 | struct dasd_device * device) | |
544 | { | |
545 | struct dasd_ccw_req *cqr; | |
546 | ||
547 | /* Sanity checks */ | |
7ac1e877 ES |
548 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
549 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 550 | |
88abaab4 | 551 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
552 | if (cqr == NULL) |
553 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
554 | cqr->cpaddr = NULL; |
555 | if (cplength > 0) { | |
88abaab4 | 556 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
557 | GFP_ATOMIC | GFP_DMA); |
558 | if (cqr->cpaddr == NULL) { | |
559 | kfree(cqr); | |
560 | return ERR_PTR(-ENOMEM); | |
561 | } | |
1da177e4 LT |
562 | } |
563 | cqr->data = NULL; | |
564 | if (datasize > 0) { | |
88abaab4 | 565 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 566 | if (cqr->data == NULL) { |
17fd682e | 567 | kfree(cqr->cpaddr); |
1da177e4 LT |
568 | kfree(cqr); |
569 | return ERR_PTR(-ENOMEM); | |
570 | } | |
1da177e4 LT |
571 | } |
572 | strncpy((char *) &cqr->magic, magic, 4); | |
573 | ASCEBC((char *) &cqr->magic, 4); | |
574 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
575 | dasd_get_device(device); | |
576 | return cqr; | |
577 | } | |
578 | ||
579 | struct dasd_ccw_req * | |
580 | dasd_smalloc_request(char *magic, int cplength, int datasize, | |
581 | struct dasd_device * device) | |
582 | { | |
583 | unsigned long flags; | |
584 | struct dasd_ccw_req *cqr; | |
585 | char *data; | |
586 | int size; | |
587 | ||
588 | /* Sanity checks */ | |
7ac1e877 ES |
589 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
590 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
591 | |
592 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
593 | if (cplength > 0) | |
594 | size += cplength * sizeof(struct ccw1); | |
595 | if (datasize > 0) | |
596 | size += datasize; | |
597 | spin_lock_irqsave(&device->mem_lock, flags); | |
598 | cqr = (struct dasd_ccw_req *) | |
599 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
600 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
601 | if (cqr == NULL) | |
602 | return ERR_PTR(-ENOMEM); | |
603 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
604 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
605 | cqr->cpaddr = NULL; | |
606 | if (cplength > 0) { | |
607 | cqr->cpaddr = (struct ccw1 *) data; | |
608 | data += cplength*sizeof(struct ccw1); | |
609 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
610 | } | |
611 | cqr->data = NULL; | |
612 | if (datasize > 0) { | |
613 | cqr->data = data; | |
614 | memset(cqr->data, 0, datasize); | |
615 | } | |
616 | strncpy((char *) &cqr->magic, magic, 4); | |
617 | ASCEBC((char *) &cqr->magic, 4); | |
618 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
619 | dasd_get_device(device); | |
620 | return cqr; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Free memory of a channel program. This function needs to free all the | |
625 | * idal lists that might have been created by dasd_set_cda and the | |
626 | * struct dasd_ccw_req itself. | |
627 | */ | |
628 | void | |
629 | dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
630 | { | |
347a8dc3 | 631 | #ifdef CONFIG_64BIT |
1da177e4 LT |
632 | struct ccw1 *ccw; |
633 | ||
634 | /* Clear any idals used for the request. */ | |
635 | ccw = cqr->cpaddr; | |
636 | do { | |
637 | clear_normalized_cda(ccw); | |
638 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
639 | #endif | |
17fd682e JJ |
640 | kfree(cqr->cpaddr); |
641 | kfree(cqr->data); | |
1da177e4 LT |
642 | kfree(cqr); |
643 | dasd_put_device(device); | |
644 | } | |
645 | ||
646 | void | |
647 | dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
648 | { | |
649 | unsigned long flags; | |
650 | ||
651 | spin_lock_irqsave(&device->mem_lock, flags); | |
652 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
653 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
654 | dasd_put_device(device); | |
655 | } | |
656 | ||
657 | /* | |
658 | * Check discipline magic in cqr. | |
659 | */ | |
660 | static inline int | |
661 | dasd_check_cqr(struct dasd_ccw_req *cqr) | |
662 | { | |
663 | struct dasd_device *device; | |
664 | ||
665 | if (cqr == NULL) | |
666 | return -EINVAL; | |
667 | device = cqr->device; | |
668 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { | |
669 | DEV_MESSAGE(KERN_WARNING, device, | |
670 | " dasd_ccw_req 0x%08x magic doesn't match" | |
671 | " discipline 0x%08x", | |
672 | cqr->magic, | |
673 | *(unsigned int *) device->discipline->name); | |
674 | return -EINVAL; | |
675 | } | |
676 | return 0; | |
677 | } | |
678 | ||
679 | /* | |
680 | * Terminate the current i/o and set the request to clear_pending. | |
681 | * Timer keeps device runnig. | |
682 | * ccw_device_clear can fail if the i/o subsystem | |
683 | * is in a bad mood. | |
684 | */ | |
685 | int | |
686 | dasd_term_IO(struct dasd_ccw_req * cqr) | |
687 | { | |
688 | struct dasd_device *device; | |
689 | int retries, rc; | |
690 | ||
691 | /* Check the cqr */ | |
692 | rc = dasd_check_cqr(cqr); | |
693 | if (rc) | |
694 | return rc; | |
695 | retries = 0; | |
696 | device = (struct dasd_device *) cqr->device; | |
697 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { | |
698 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
699 | switch (rc) { | |
700 | case 0: /* termination successful */ | |
c2ba444d HH |
701 | cqr->retries--; |
702 | cqr->status = DASD_CQR_CLEAR; | |
1da177e4 LT |
703 | cqr->stopclk = get_clock(); |
704 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
705 | "terminate cqr %p successful", | |
706 | cqr); | |
707 | break; | |
708 | case -ENODEV: | |
709 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
710 | "device gone, retry"); | |
711 | break; | |
712 | case -EIO: | |
713 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
714 | "I/O error, retry"); | |
715 | break; | |
716 | case -EINVAL: | |
717 | case -EBUSY: | |
718 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
719 | "device busy, retry later"); | |
720 | break; | |
721 | default: | |
722 | DEV_MESSAGE(KERN_ERR, device, | |
723 | "line %d unknown RC=%d, please " | |
724 | "report to linux390@de.ibm.com", | |
725 | __LINE__, rc); | |
726 | BUG(); | |
727 | break; | |
728 | } | |
729 | retries++; | |
730 | } | |
731 | dasd_schedule_bh(device); | |
732 | return rc; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
737 | * In that case set up a timer to start the request later. | |
738 | */ | |
739 | int | |
740 | dasd_start_IO(struct dasd_ccw_req * cqr) | |
741 | { | |
742 | struct dasd_device *device; | |
743 | int rc; | |
744 | ||
745 | /* Check the cqr */ | |
746 | rc = dasd_check_cqr(cqr); | |
747 | if (rc) | |
748 | return rc; | |
749 | device = (struct dasd_device *) cqr->device; | |
750 | if (cqr->retries < 0) { | |
751 | DEV_MESSAGE(KERN_DEBUG, device, | |
752 | "start_IO: request %p (%02x/%i) - no retry left.", | |
753 | cqr, cqr->status, cqr->retries); | |
754 | cqr->status = DASD_CQR_FAILED; | |
755 | return -EIO; | |
756 | } | |
757 | cqr->startclk = get_clock(); | |
758 | cqr->starttime = jiffies; | |
759 | cqr->retries--; | |
760 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
761 | cqr->lpm, 0); | |
762 | switch (rc) { | |
763 | case 0: | |
764 | cqr->status = DASD_CQR_IN_IO; | |
765 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
766 | "start_IO: request %p started successful", | |
767 | cqr); | |
768 | break; | |
769 | case -EBUSY: | |
770 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
771 | "start_IO: device busy, retry later"); | |
772 | break; | |
773 | case -ETIMEDOUT: | |
774 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
775 | "start_IO: request timeout, retry later"); | |
776 | break; | |
777 | case -EACCES: | |
778 | /* -EACCES indicates that the request used only a | |
779 | * subset of the available pathes and all these | |
780 | * pathes are gone. | |
781 | * Do a retry with all available pathes. | |
782 | */ | |
783 | cqr->lpm = LPM_ANYPATH; | |
784 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
785 | "start_IO: selected pathes gone," | |
786 | " retry on all pathes"); | |
787 | break; | |
788 | case -ENODEV: | |
789 | case -EIO: | |
790 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
791 | "start_IO: device gone, retry"); | |
792 | break; | |
793 | default: | |
794 | DEV_MESSAGE(KERN_ERR, device, | |
795 | "line %d unknown RC=%d, please report" | |
796 | " to linux390@de.ibm.com", __LINE__, rc); | |
797 | BUG(); | |
798 | break; | |
799 | } | |
800 | return rc; | |
801 | } | |
802 | ||
803 | /* | |
804 | * Timeout function for dasd devices. This is used for different purposes | |
805 | * 1) missing interrupt handler for normal operation | |
806 | * 2) delayed start of request where start_IO failed with -EBUSY | |
807 | * 3) timeout for missing state change interrupts | |
808 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
809 | * DASD_CQR_QUEUED for 2) and 3). | |
810 | */ | |
811 | static void | |
812 | dasd_timeout_device(unsigned long ptr) | |
813 | { | |
814 | unsigned long flags; | |
815 | struct dasd_device *device; | |
816 | ||
817 | device = (struct dasd_device *) ptr; | |
818 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
819 | /* re-activate request queue */ | |
820 | device->stopped &= ~DASD_STOPPED_PENDING; | |
821 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
822 | dasd_schedule_bh(device); | |
823 | } | |
824 | ||
825 | /* | |
826 | * Setup timeout for a device in jiffies. | |
827 | */ | |
828 | void | |
829 | dasd_set_timer(struct dasd_device *device, int expires) | |
830 | { | |
831 | if (expires == 0) { | |
832 | if (timer_pending(&device->timer)) | |
833 | del_timer(&device->timer); | |
834 | return; | |
835 | } | |
836 | if (timer_pending(&device->timer)) { | |
837 | if (mod_timer(&device->timer, jiffies + expires)) | |
838 | return; | |
839 | } | |
840 | device->timer.function = dasd_timeout_device; | |
841 | device->timer.data = (unsigned long) device; | |
842 | device->timer.expires = jiffies + expires; | |
843 | add_timer(&device->timer); | |
844 | } | |
845 | ||
846 | /* | |
847 | * Clear timeout for a device. | |
848 | */ | |
849 | void | |
850 | dasd_clear_timer(struct dasd_device *device) | |
851 | { | |
852 | if (timer_pending(&device->timer)) | |
853 | del_timer(&device->timer); | |
854 | } | |
855 | ||
856 | static void | |
857 | dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm) | |
858 | { | |
859 | struct dasd_ccw_req *cqr; | |
860 | struct dasd_device *device; | |
861 | ||
862 | cqr = (struct dasd_ccw_req *) intparm; | |
863 | if (cqr->status != DASD_CQR_IN_IO) { | |
864 | MESSAGE(KERN_DEBUG, | |
865 | "invalid status in handle_killed_request: " | |
866 | "bus_id %s, status %02x", | |
867 | cdev->dev.bus_id, cqr->status); | |
868 | return; | |
869 | } | |
870 | ||
871 | device = (struct dasd_device *) cqr->device; | |
872 | if (device == NULL || | |
873 | device != dasd_device_from_cdev(cdev) || | |
874 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
875 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
876 | cdev->dev.bus_id); | |
877 | return; | |
878 | } | |
879 | ||
880 | /* Schedule request to be retried. */ | |
881 | cqr->status = DASD_CQR_QUEUED; | |
882 | ||
883 | dasd_clear_timer(device); | |
884 | dasd_schedule_bh(device); | |
885 | dasd_put_device(device); | |
886 | } | |
887 | ||
888 | static void | |
889 | dasd_handle_state_change_pending(struct dasd_device *device) | |
890 | { | |
891 | struct dasd_ccw_req *cqr; | |
892 | struct list_head *l, *n; | |
893 | ||
20c64468 SW |
894 | /* First of all start sense subsystem status request. */ |
895 | dasd_eer_snss(device); | |
896 | ||
1da177e4 LT |
897 | device->stopped &= ~DASD_STOPPED_PENDING; |
898 | ||
899 | /* restart all 'running' IO on queue */ | |
900 | list_for_each_safe(l, n, &device->ccw_queue) { | |
901 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
902 | if (cqr->status == DASD_CQR_IN_IO) { | |
903 | cqr->status = DASD_CQR_QUEUED; | |
904 | } | |
905 | } | |
906 | dasd_clear_timer(device); | |
907 | dasd_schedule_bh(device); | |
908 | } | |
909 | ||
910 | /* | |
911 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
912 | */ | |
913 | void | |
914 | dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
915 | struct irb *irb) | |
916 | { | |
917 | struct dasd_ccw_req *cqr, *next; | |
918 | struct dasd_device *device; | |
919 | unsigned long long now; | |
920 | int expires; | |
921 | dasd_era_t era; | |
922 | char mask; | |
923 | ||
924 | if (IS_ERR(irb)) { | |
925 | switch (PTR_ERR(irb)) { | |
926 | case -EIO: | |
927 | dasd_handle_killed_request(cdev, intparm); | |
928 | break; | |
929 | case -ETIMEDOUT: | |
930 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
931 | __FUNCTION__, cdev->dev.bus_id); | |
932 | //FIXME - dasd uses own timeout interface... | |
933 | break; | |
934 | default: | |
935 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
936 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); | |
937 | } | |
938 | return; | |
939 | } | |
940 | ||
941 | now = get_clock(); | |
942 | ||
943 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
944 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), | |
945 | (unsigned int) intparm); | |
946 | ||
947 | /* first of all check for state change pending interrupt */ | |
948 | mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; | |
949 | if ((irb->scsw.dstat & mask) == mask) { | |
950 | device = dasd_device_from_cdev(cdev); | |
951 | if (!IS_ERR(device)) { | |
952 | dasd_handle_state_change_pending(device); | |
953 | dasd_put_device(device); | |
954 | } | |
955 | return; | |
956 | } | |
957 | ||
958 | cqr = (struct dasd_ccw_req *) intparm; | |
959 | ||
960 | /* check for unsolicited interrupts */ | |
961 | if (cqr == NULL) { | |
962 | MESSAGE(KERN_DEBUG, | |
963 | "unsolicited interrupt received: bus_id %s", | |
964 | cdev->dev.bus_id); | |
965 | return; | |
966 | } | |
967 | ||
968 | device = (struct dasd_device *) cqr->device; | |
969 | if (device == NULL || | |
970 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
971 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
972 | cdev->dev.bus_id); | |
973 | return; | |
974 | } | |
975 | ||
976 | /* Check for clear pending */ | |
977 | if (cqr->status == DASD_CQR_CLEAR && | |
978 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { | |
979 | cqr->status = DASD_CQR_QUEUED; | |
980 | dasd_clear_timer(device); | |
981 | dasd_schedule_bh(device); | |
982 | return; | |
983 | } | |
984 | ||
985 | /* check status - the request might have been killed by dyn detach */ | |
986 | if (cqr->status != DASD_CQR_IN_IO) { | |
987 | MESSAGE(KERN_DEBUG, | |
988 | "invalid status: bus_id %s, status %02x", | |
989 | cdev->dev.bus_id, cqr->status); | |
990 | return; | |
991 | } | |
992 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
993 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); | |
994 | ||
995 | /* Find out the appropriate era_action. */ | |
138c014d | 996 | if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) |
1da177e4 LT |
997 | era = dasd_era_fatal; |
998 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
999 | irb->scsw.cstat == 0 && | |
1000 | !irb->esw.esw0.erw.cons) | |
1001 | era = dasd_era_none; | |
1002 | else if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) | |
1003 | era = dasd_era_fatal; /* don't recover this request */ | |
1004 | else if (irb->esw.esw0.erw.cons) | |
1005 | era = device->discipline->examine_error(cqr, irb); | |
138c014d | 1006 | else |
1da177e4 LT |
1007 | era = dasd_era_recover; |
1008 | ||
1009 | DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); | |
1010 | expires = 0; | |
1011 | if (era == dasd_era_none) { | |
1012 | cqr->status = DASD_CQR_DONE; | |
1013 | cqr->stopclk = now; | |
1014 | /* Start first request on queue if possible -> fast_io. */ | |
1015 | if (cqr->list.next != &device->ccw_queue) { | |
1016 | next = list_entry(cqr->list.next, | |
1017 | struct dasd_ccw_req, list); | |
1018 | if ((next->status == DASD_CQR_QUEUED) && | |
1019 | (!device->stopped)) { | |
1020 | if (device->discipline->start_IO(next) == 0) | |
1021 | expires = next->expires; | |
1022 | else | |
1023 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1024 | "Interrupt fastpath " | |
1025 | "failed!"); | |
1026 | } | |
1027 | } | |
1028 | } else { /* error */ | |
1029 | memcpy(&cqr->irb, irb, sizeof (struct irb)); | |
1030 | #ifdef ERP_DEBUG | |
1031 | /* dump sense data */ | |
1032 | dasd_log_sense(cqr, irb); | |
1033 | #endif | |
1034 | switch (era) { | |
1035 | case dasd_era_fatal: | |
1036 | cqr->status = DASD_CQR_FAILED; | |
1037 | cqr->stopclk = now; | |
1038 | break; | |
1039 | case dasd_era_recover: | |
1040 | cqr->status = DASD_CQR_ERROR; | |
1041 | break; | |
1042 | default: | |
1043 | BUG(); | |
1044 | } | |
1045 | } | |
1046 | if (expires != 0) | |
1047 | dasd_set_timer(device, expires); | |
1048 | else | |
1049 | dasd_clear_timer(device); | |
1050 | dasd_schedule_bh(device); | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * posts the buffer_cache about a finalized request | |
1055 | */ | |
1056 | static inline void | |
1057 | dasd_end_request(struct request *req, int uptodate) | |
1058 | { | |
1059 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) | |
1060 | BUG(); | |
1061 | add_disk_randomness(req->rq_disk); | |
8ffdc655 | 1062 | end_that_request_last(req, uptodate); |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | /* | |
1066 | * Process finished error recovery ccw. | |
1067 | */ | |
1068 | static inline void | |
1069 | __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr) | |
1070 | { | |
1071 | dasd_erp_fn_t erp_fn; | |
1072 | ||
1073 | if (cqr->status == DASD_CQR_DONE) | |
1074 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1075 | else | |
1076 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1077 | erp_fn = device->discipline->erp_postaction(cqr); | |
1078 | erp_fn(cqr); | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * Process ccw request queue. | |
1083 | */ | |
1084 | static inline void | |
1085 | __dasd_process_ccw_queue(struct dasd_device * device, | |
1086 | struct list_head *final_queue) | |
1087 | { | |
1088 | struct list_head *l, *n; | |
1089 | struct dasd_ccw_req *cqr; | |
1090 | dasd_erp_fn_t erp_fn; | |
1091 | ||
1092 | restart: | |
1093 | /* Process request with final status. */ | |
1094 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1095 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1096 | /* Stop list processing at the first non-final request. */ | |
1097 | if (cqr->status != DASD_CQR_DONE && | |
1098 | cqr->status != DASD_CQR_FAILED && | |
1099 | cqr->status != DASD_CQR_ERROR) | |
1100 | break; | |
1101 | /* Process requests with DASD_CQR_ERROR */ | |
1102 | if (cqr->status == DASD_CQR_ERROR) { | |
1103 | if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) { | |
1104 | cqr->status = DASD_CQR_FAILED; | |
1105 | cqr->stopclk = get_clock(); | |
1106 | } else { | |
1107 | if (cqr->irb.esw.esw0.erw.cons) { | |
1108 | erp_fn = device->discipline-> | |
1109 | erp_action(cqr); | |
1110 | erp_fn(cqr); | |
1111 | } else | |
1112 | dasd_default_erp_action(cqr); | |
1113 | } | |
1114 | goto restart; | |
1115 | } | |
20c64468 SW |
1116 | |
1117 | /* First of all call extended error reporting. */ | |
1118 | if (dasd_eer_enabled(device) && | |
1119 | cqr->status == DASD_CQR_FAILED) { | |
1120 | dasd_eer_write(device, cqr, DASD_EER_FATALERROR); | |
1121 | ||
1122 | /* restart request */ | |
1123 | cqr->status = DASD_CQR_QUEUED; | |
1124 | cqr->retries = 255; | |
1125 | device->stopped |= DASD_STOPPED_QUIESCE; | |
1126 | goto restart; | |
1127 | } | |
1128 | ||
1da177e4 LT |
1129 | /* Process finished ERP request. */ |
1130 | if (cqr->refers) { | |
1131 | __dasd_process_erp(device, cqr); | |
1132 | goto restart; | |
1133 | } | |
1134 | ||
1135 | /* Rechain finished requests to final queue */ | |
1136 | cqr->endclk = get_clock(); | |
1137 | list_move_tail(&cqr->list, final_queue); | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | static void | |
1142 | dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data) | |
1143 | { | |
1144 | struct request *req; | |
1145 | struct dasd_device *device; | |
1146 | int status; | |
1147 | ||
1148 | req = (struct request *) data; | |
1149 | device = cqr->device; | |
1150 | dasd_profile_end(device, cqr, req); | |
1151 | status = cqr->device->discipline->free_cp(cqr,req); | |
1152 | spin_lock_irq(&device->request_queue_lock); | |
1153 | dasd_end_request(req, status); | |
1154 | spin_unlock_irq(&device->request_queue_lock); | |
1155 | } | |
1156 | ||
1157 | ||
1158 | /* | |
1159 | * Fetch requests from the block device queue. | |
1160 | */ | |
1161 | static inline void | |
1162 | __dasd_process_blk_queue(struct dasd_device * device) | |
1163 | { | |
1164 | request_queue_t *queue; | |
1165 | struct request *req; | |
1166 | struct dasd_ccw_req *cqr; | |
c6eb7b77 | 1167 | int nr_queued; |
1da177e4 LT |
1168 | |
1169 | queue = device->request_queue; | |
1170 | /* No queue ? Then there is nothing to do. */ | |
1171 | if (queue == NULL) | |
1172 | return; | |
1173 | ||
1174 | /* | |
1175 | * We requeue request from the block device queue to the ccw | |
1176 | * queue only in two states. In state DASD_STATE_READY the | |
1177 | * partition detection is done and we need to requeue requests | |
1178 | * for that. State DASD_STATE_ONLINE is normal block device | |
1179 | * operation. | |
1180 | */ | |
1181 | if (device->state != DASD_STATE_READY && | |
1182 | device->state != DASD_STATE_ONLINE) | |
1183 | return; | |
1184 | nr_queued = 0; | |
1185 | /* Now we try to fetch requests from the request queue */ | |
1186 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1187 | if (cqr->status == DASD_CQR_QUEUED) | |
1188 | nr_queued++; | |
1189 | while (!blk_queue_plugged(queue) && | |
1190 | elv_next_request(queue) && | |
1191 | nr_queued < DASD_CHANQ_MAX_SIZE) { | |
1192 | req = elv_next_request(queue); | |
f24acd45 | 1193 | |
c6eb7b77 HH |
1194 | if (device->features & DASD_FEATURE_READONLY && |
1195 | rq_data_dir(req) == WRITE) { | |
1da177e4 LT |
1196 | DBF_DEV_EVENT(DBF_ERR, device, |
1197 | "Rejecting write request %p", | |
1198 | req); | |
1199 | blkdev_dequeue_request(req); | |
1200 | dasd_end_request(req, 0); | |
1201 | continue; | |
1202 | } | |
1203 | if (device->stopped & DASD_STOPPED_DC_EIO) { | |
1204 | blkdev_dequeue_request(req); | |
1205 | dasd_end_request(req, 0); | |
1206 | continue; | |
1207 | } | |
1208 | cqr = device->discipline->build_cp(device, req); | |
1209 | if (IS_ERR(cqr)) { | |
1210 | if (PTR_ERR(cqr) == -ENOMEM) | |
1211 | break; /* terminate request queue loop */ | |
1212 | DBF_DEV_EVENT(DBF_ERR, device, | |
1213 | "CCW creation failed (rc=%ld) " | |
1214 | "on request %p", | |
1215 | PTR_ERR(cqr), req); | |
1216 | blkdev_dequeue_request(req); | |
1217 | dasd_end_request(req, 0); | |
1218 | continue; | |
1219 | } | |
1220 | cqr->callback = dasd_end_request_cb; | |
1221 | cqr->callback_data = (void *) req; | |
1222 | cqr->status = DASD_CQR_QUEUED; | |
1223 | blkdev_dequeue_request(req); | |
1224 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1225 | dasd_profile_start(device, cqr, req); | |
1226 | nr_queued++; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Take a look at the first request on the ccw queue and check | |
1232 | * if it reached its expire time. If so, terminate the IO. | |
1233 | */ | |
1234 | static inline void | |
1235 | __dasd_check_expire(struct dasd_device * device) | |
1236 | { | |
1237 | struct dasd_ccw_req *cqr; | |
1238 | ||
1239 | if (list_empty(&device->ccw_queue)) | |
1240 | return; | |
1241 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1242 | if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) { | |
1243 | if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) { | |
1244 | if (device->discipline->term_IO(cqr) != 0) | |
1245 | /* Hmpf, try again in 1/10 sec */ | |
1246 | dasd_set_timer(device, 10); | |
1247 | } | |
1248 | } | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * Take a look at the first request on the ccw queue and check | |
1253 | * if it needs to be started. | |
1254 | */ | |
1255 | static inline void | |
1256 | __dasd_start_head(struct dasd_device * device) | |
1257 | { | |
1258 | struct dasd_ccw_req *cqr; | |
1259 | int rc; | |
1260 | ||
1261 | if (list_empty(&device->ccw_queue)) | |
1262 | return; | |
1263 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
25ee4cf8 PO |
1264 | if (cqr->status != DASD_CQR_QUEUED) |
1265 | return; | |
1266 | /* Non-temporary stop condition will trigger fail fast */ | |
1c01b8a5 | 1267 | if (device->stopped & ~DASD_STOPPED_PENDING && |
20c64468 SW |
1268 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
1269 | (!dasd_eer_enabled(device))) { | |
1c01b8a5 HH |
1270 | cqr->status = DASD_CQR_FAILED; |
1271 | dasd_schedule_bh(device); | |
25ee4cf8 | 1272 | return; |
1c01b8a5 | 1273 | } |
25ee4cf8 PO |
1274 | /* Don't try to start requests if device is stopped */ |
1275 | if (device->stopped) | |
1276 | return; | |
1277 | ||
1278 | rc = device->discipline->start_IO(cqr); | |
1279 | if (rc == 0) | |
1280 | dasd_set_timer(device, cqr->expires); | |
1281 | else if (rc == -EACCES) { | |
1282 | dasd_schedule_bh(device); | |
1283 | } else | |
1284 | /* Hmpf, try again in 1/2 sec */ | |
1285 | dasd_set_timer(device, 50); | |
1da177e4 LT |
1286 | } |
1287 | ||
1288 | /* | |
138c014d | 1289 | * Remove requests from the ccw queue. |
1da177e4 LT |
1290 | */ |
1291 | static void | |
1292 | dasd_flush_ccw_queue(struct dasd_device * device, int all) | |
1293 | { | |
1294 | struct list_head flush_queue; | |
1295 | struct list_head *l, *n; | |
1296 | struct dasd_ccw_req *cqr; | |
1297 | ||
1298 | INIT_LIST_HEAD(&flush_queue); | |
1299 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1300 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1301 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1302 | /* Flush all request or only block device requests? */ | |
1303 | if (all == 0 && cqr->callback == dasd_end_request_cb) | |
1304 | continue; | |
1305 | if (cqr->status == DASD_CQR_IN_IO) | |
1306 | device->discipline->term_IO(cqr); | |
1307 | if (cqr->status != DASD_CQR_DONE || | |
1308 | cqr->status != DASD_CQR_FAILED) { | |
1309 | cqr->status = DASD_CQR_FAILED; | |
1310 | cqr->stopclk = get_clock(); | |
1311 | } | |
1312 | /* Process finished ERP request. */ | |
1313 | if (cqr->refers) { | |
1314 | __dasd_process_erp(device, cqr); | |
1315 | continue; | |
1316 | } | |
1317 | /* Rechain request on device request queue */ | |
1318 | cqr->endclk = get_clock(); | |
1319 | list_move_tail(&cqr->list, &flush_queue); | |
1320 | } | |
1321 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1322 | /* Now call the callback function of flushed requests */ | |
1323 | list_for_each_safe(l, n, &flush_queue) { | |
1324 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1325 | if (cqr->callback != NULL) | |
1326 | (cqr->callback)(cqr, cqr->callback_data); | |
1327 | } | |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * Acquire the device lock and process queues for the device. | |
1332 | */ | |
1333 | static void | |
1334 | dasd_tasklet(struct dasd_device * device) | |
1335 | { | |
1336 | struct list_head final_queue; | |
1337 | struct list_head *l, *n; | |
1338 | struct dasd_ccw_req *cqr; | |
1339 | ||
1340 | atomic_set (&device->tasklet_scheduled, 0); | |
1341 | INIT_LIST_HEAD(&final_queue); | |
1342 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1343 | /* Check expire time of first request on the ccw queue. */ | |
1344 | __dasd_check_expire(device); | |
1345 | /* Finish off requests on ccw queue */ | |
1346 | __dasd_process_ccw_queue(device, &final_queue); | |
1347 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1348 | /* Now call the callback function of requests with final status */ | |
1349 | list_for_each_safe(l, n, &final_queue) { | |
1350 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
c2ba444d | 1351 | list_del_init(&cqr->list); |
1da177e4 LT |
1352 | if (cqr->callback != NULL) |
1353 | (cqr->callback)(cqr, cqr->callback_data); | |
1354 | } | |
1355 | spin_lock_irq(&device->request_queue_lock); | |
1356 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1357 | /* Get new request from the block device request queue */ | |
1358 | __dasd_process_blk_queue(device); | |
1359 | /* Now check if the head of the ccw queue needs to be started. */ | |
1360 | __dasd_start_head(device); | |
1361 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1362 | spin_unlock_irq(&device->request_queue_lock); | |
1363 | dasd_put_device(device); | |
1364 | } | |
1365 | ||
1366 | /* | |
1367 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1368 | */ | |
1369 | void | |
1370 | dasd_schedule_bh(struct dasd_device * device) | |
1371 | { | |
1372 | /* Protect against rescheduling. */ | |
973bd993 | 1373 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1374 | return; |
1375 | dasd_get_device(device); | |
1376 | tasklet_hi_schedule(&device->tasklet); | |
1377 | } | |
1378 | ||
1379 | /* | |
1380 | * Queue a request to the head of the ccw_queue. Start the I/O if | |
1381 | * possible. | |
1382 | */ | |
1383 | void | |
1384 | dasd_add_request_head(struct dasd_ccw_req *req) | |
1385 | { | |
1386 | struct dasd_device *device; | |
1387 | unsigned long flags; | |
1388 | ||
1389 | device = req->device; | |
1390 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1391 | req->status = DASD_CQR_QUEUED; | |
1392 | req->device = device; | |
1393 | list_add(&req->list, &device->ccw_queue); | |
1394 | /* let the bh start the request to keep them in order */ | |
1395 | dasd_schedule_bh(device); | |
1396 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * Queue a request to the tail of the ccw_queue. Start the I/O if | |
1401 | * possible. | |
1402 | */ | |
1403 | void | |
1404 | dasd_add_request_tail(struct dasd_ccw_req *req) | |
1405 | { | |
1406 | struct dasd_device *device; | |
1407 | unsigned long flags; | |
1408 | ||
1409 | device = req->device; | |
1410 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1411 | req->status = DASD_CQR_QUEUED; | |
1412 | req->device = device; | |
1413 | list_add_tail(&req->list, &device->ccw_queue); | |
1414 | /* let the bh start the request to keep them in order */ | |
1415 | dasd_schedule_bh(device); | |
1416 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1417 | } | |
1418 | ||
1419 | /* | |
1420 | * Wakeup callback. | |
1421 | */ | |
1422 | static void | |
1423 | dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) | |
1424 | { | |
1425 | wake_up((wait_queue_head_t *) data); | |
1426 | } | |
1427 | ||
1428 | static inline int | |
1429 | _wait_for_wakeup(struct dasd_ccw_req *cqr) | |
1430 | { | |
1431 | struct dasd_device *device; | |
1432 | int rc; | |
1433 | ||
1434 | device = cqr->device; | |
1435 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1436 | rc = ((cqr->status == DASD_CQR_DONE || |
1437 | cqr->status == DASD_CQR_FAILED) && | |
1438 | list_empty(&cqr->list)); | |
1da177e4 LT |
1439 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1440 | return rc; | |
1441 | } | |
1442 | ||
1443 | /* | |
1444 | * Attempts to start a special ccw queue and waits for its completion. | |
1445 | */ | |
1446 | int | |
1447 | dasd_sleep_on(struct dasd_ccw_req * cqr) | |
1448 | { | |
1449 | wait_queue_head_t wait_q; | |
1450 | struct dasd_device *device; | |
1451 | int rc; | |
138c014d | 1452 | |
1da177e4 LT |
1453 | device = cqr->device; |
1454 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
138c014d | 1455 | |
1da177e4 LT |
1456 | init_waitqueue_head (&wait_q); |
1457 | cqr->callback = dasd_wakeup_cb; | |
1458 | cqr->callback_data = (void *) &wait_q; | |
1459 | cqr->status = DASD_CQR_QUEUED; | |
1460 | list_add_tail(&cqr->list, &device->ccw_queue); | |
138c014d | 1461 | |
1da177e4 LT |
1462 | /* let the bh start the request to keep them in order */ |
1463 | dasd_schedule_bh(device); | |
138c014d | 1464 | |
1da177e4 LT |
1465 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1466 | ||
1467 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1468 | |
1da177e4 LT |
1469 | /* Request status is either done or failed. */ |
1470 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1471 | return rc; | |
1472 | } | |
1473 | ||
1474 | /* | |
1475 | * Attempts to start a special ccw queue and wait interruptible | |
1476 | * for its completion. | |
1477 | */ | |
1478 | int | |
1479 | dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) | |
1480 | { | |
1481 | wait_queue_head_t wait_q; | |
1482 | struct dasd_device *device; | |
1483 | int rc, finished; | |
1484 | ||
1485 | device = cqr->device; | |
1486 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1487 | ||
1488 | init_waitqueue_head (&wait_q); | |
1489 | cqr->callback = dasd_wakeup_cb; | |
1490 | cqr->callback_data = (void *) &wait_q; | |
1491 | cqr->status = DASD_CQR_QUEUED; | |
1492 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1493 | ||
1494 | /* let the bh start the request to keep them in order */ | |
1495 | dasd_schedule_bh(device); | |
1496 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1497 | ||
1498 | finished = 0; | |
1499 | while (!finished) { | |
1500 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); | |
1501 | if (rc != -ERESTARTSYS) { | |
c2ba444d HH |
1502 | /* Request is final (done or failed) */ |
1503 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1da177e4 LT |
1504 | break; |
1505 | } | |
1506 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
c2ba444d HH |
1507 | switch (cqr->status) { |
1508 | case DASD_CQR_IN_IO: | |
1509 | /* terminate runnig cqr */ | |
1510 | if (device->discipline->term_IO) { | |
1511 | cqr->retries = -1; | |
1512 | device->discipline->term_IO(cqr); | |
1513 | /*nished = | |
1514 | * wait (non-interruptible) for final status | |
1515 | * because signal ist still pending | |
1516 | */ | |
1517 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1518 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1519 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1520 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; | |
1521 | finished = 1; | |
1522 | } | |
1523 | break; | |
1524 | case DASD_CQR_QUEUED: | |
1525 | /* request */ | |
1526 | list_del_init(&cqr->list); | |
1527 | rc = -EIO; | |
1da177e4 | 1528 | finished = 1; |
c2ba444d HH |
1529 | break; |
1530 | default: | |
1531 | /* cqr with 'non-interruptable' status - just wait */ | |
1532 | break; | |
1da177e4 LT |
1533 | } |
1534 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1535 | } | |
1536 | return rc; | |
1537 | } | |
1538 | ||
1539 | /* | |
1540 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1541 | * for eckd devices) the currently running request has to be terminated | |
1542 | * and be put back to status queued, before the special request is added | |
1543 | * to the head of the queue. Then the special request is waited on normally. | |
1544 | */ | |
1545 | static inline int | |
1546 | _dasd_term_running_cqr(struct dasd_device *device) | |
1547 | { | |
1548 | struct dasd_ccw_req *cqr; | |
1549 | int rc; | |
1550 | ||
1551 | if (list_empty(&device->ccw_queue)) | |
1552 | return 0; | |
1553 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1554 | rc = device->discipline->term_IO(cqr); | |
1555 | if (rc == 0) { | |
1556 | /* termination successful */ | |
1557 | cqr->status = DASD_CQR_QUEUED; | |
1558 | cqr->startclk = cqr->stopclk = 0; | |
1559 | cqr->starttime = 0; | |
1560 | } | |
1561 | return rc; | |
1562 | } | |
1563 | ||
1564 | int | |
1565 | dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) | |
1566 | { | |
1567 | wait_queue_head_t wait_q; | |
1568 | struct dasd_device *device; | |
1569 | int rc; | |
138c014d | 1570 | |
1da177e4 LT |
1571 | device = cqr->device; |
1572 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1573 | rc = _dasd_term_running_cqr(device); | |
1574 | if (rc) { | |
1575 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1576 | return rc; | |
1577 | } | |
138c014d | 1578 | |
1da177e4 LT |
1579 | init_waitqueue_head (&wait_q); |
1580 | cqr->callback = dasd_wakeup_cb; | |
1581 | cqr->callback_data = (void *) &wait_q; | |
1582 | cqr->status = DASD_CQR_QUEUED; | |
1583 | list_add(&cqr->list, &device->ccw_queue); | |
138c014d | 1584 | |
1da177e4 LT |
1585 | /* let the bh start the request to keep them in order */ |
1586 | dasd_schedule_bh(device); | |
138c014d | 1587 | |
1da177e4 LT |
1588 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1589 | ||
1590 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1591 | |
1da177e4 LT |
1592 | /* Request status is either done or failed. */ |
1593 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1594 | return rc; | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * Cancels a request that was started with dasd_sleep_on_req. | |
1599 | * This is useful to timeout requests. The request will be | |
1600 | * terminated if it is currently in i/o. | |
1601 | * Returns 1 if the request has been terminated. | |
1602 | */ | |
1603 | int | |
1604 | dasd_cancel_req(struct dasd_ccw_req *cqr) | |
1605 | { | |
1606 | struct dasd_device *device = cqr->device; | |
1607 | unsigned long flags; | |
1608 | int rc; | |
1609 | ||
1610 | rc = 0; | |
1611 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1612 | switch (cqr->status) { | |
1613 | case DASD_CQR_QUEUED: | |
1614 | /* request was not started - just set to failed */ | |
1615 | cqr->status = DASD_CQR_FAILED; | |
1616 | break; | |
1617 | case DASD_CQR_IN_IO: | |
1618 | /* request in IO - terminate IO and release again */ | |
1619 | if (device->discipline->term_IO(cqr) != 0) | |
1620 | /* what to do if unable to terminate ?????? | |
1621 | e.g. not _IN_IO */ | |
1622 | cqr->status = DASD_CQR_FAILED; | |
1623 | cqr->stopclk = get_clock(); | |
1624 | rc = 1; | |
1625 | break; | |
1626 | case DASD_CQR_DONE: | |
1627 | case DASD_CQR_FAILED: | |
1628 | /* already finished - do nothing */ | |
1629 | break; | |
1630 | default: | |
1631 | DEV_MESSAGE(KERN_ALERT, device, | |
1632 | "invalid status %02x in request", | |
1633 | cqr->status); | |
1634 | BUG(); | |
1635 | ||
1636 | } | |
1637 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1638 | dasd_schedule_bh(device); | |
1639 | return rc; | |
1640 | } | |
1641 | ||
1642 | /* | |
1643 | * SECTION: Block device operations (request queue, partitions, open, release). | |
1644 | */ | |
1645 | ||
1646 | /* | |
1647 | * Dasd request queue function. Called from ll_rw_blk.c | |
1648 | */ | |
1649 | static void | |
1650 | do_dasd_request(request_queue_t * queue) | |
1651 | { | |
1652 | struct dasd_device *device; | |
1653 | ||
1654 | device = (struct dasd_device *) queue->queuedata; | |
1655 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1656 | /* Get new request from the block device request queue */ | |
1657 | __dasd_process_blk_queue(device); | |
1658 | /* Now check if the head of the ccw queue needs to be started. */ | |
1659 | __dasd_start_head(device); | |
1660 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1661 | } | |
1662 | ||
1663 | /* | |
1664 | * Allocate and initialize request queue and default I/O scheduler. | |
1665 | */ | |
1666 | static int | |
1667 | dasd_alloc_queue(struct dasd_device * device) | |
1668 | { | |
1669 | int rc; | |
1670 | ||
1671 | device->request_queue = blk_init_queue(do_dasd_request, | |
1672 | &device->request_queue_lock); | |
1673 | if (device->request_queue == NULL) | |
1674 | return -ENOMEM; | |
1675 | ||
1676 | device->request_queue->queuedata = device; | |
1677 | ||
1678 | elevator_exit(device->request_queue->elevator); | |
1679 | rc = elevator_init(device->request_queue, "deadline"); | |
1680 | if (rc) { | |
1681 | blk_cleanup_queue(device->request_queue); | |
1682 | return rc; | |
1683 | } | |
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | /* | |
1688 | * Allocate and initialize request queue. | |
1689 | */ | |
1690 | static void | |
1691 | dasd_setup_queue(struct dasd_device * device) | |
1692 | { | |
1693 | int max; | |
1694 | ||
1695 | blk_queue_hardsect_size(device->request_queue, device->bp_block); | |
1696 | max = device->discipline->max_blocks << device->s2b_shift; | |
1697 | blk_queue_max_sectors(device->request_queue, max); | |
1698 | blk_queue_max_phys_segments(device->request_queue, -1L); | |
1699 | blk_queue_max_hw_segments(device->request_queue, -1L); | |
1700 | blk_queue_max_segment_size(device->request_queue, -1L); | |
1701 | blk_queue_segment_boundary(device->request_queue, -1L); | |
ed68cb36 | 1702 | blk_queue_ordered(device->request_queue, QUEUE_ORDERED_TAG, NULL); |
1da177e4 LT |
1703 | } |
1704 | ||
1705 | /* | |
1706 | * Deactivate and free request queue. | |
1707 | */ | |
1708 | static void | |
1709 | dasd_free_queue(struct dasd_device * device) | |
1710 | { | |
1711 | if (device->request_queue) { | |
1712 | blk_cleanup_queue(device->request_queue); | |
1713 | device->request_queue = NULL; | |
1714 | } | |
1715 | } | |
1716 | ||
1717 | /* | |
1718 | * Flush request on the request queue. | |
1719 | */ | |
1720 | static void | |
1721 | dasd_flush_request_queue(struct dasd_device * device) | |
1722 | { | |
1723 | struct request *req; | |
1724 | ||
1725 | if (!device->request_queue) | |
1726 | return; | |
138c014d | 1727 | |
1da177e4 LT |
1728 | spin_lock_irq(&device->request_queue_lock); |
1729 | while (!list_empty(&device->request_queue->queue_head)) { | |
1730 | req = elv_next_request(device->request_queue); | |
1731 | if (req == NULL) | |
1732 | break; | |
1da177e4 | 1733 | blkdev_dequeue_request(req); |
ebc45999 | 1734 | dasd_end_request(req, 0); |
1da177e4 LT |
1735 | } |
1736 | spin_unlock_irq(&device->request_queue_lock); | |
1737 | } | |
1738 | ||
1739 | static int | |
1740 | dasd_open(struct inode *inp, struct file *filp) | |
1741 | { | |
1742 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1743 | struct dasd_device *device = disk->private_data; | |
1744 | int rc; | |
1745 | ||
1746 | atomic_inc(&device->open_count); | |
1747 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1748 | rc = -ENODEV; | |
1749 | goto unlock; | |
1750 | } | |
1751 | ||
1752 | if (!try_module_get(device->discipline->owner)) { | |
1753 | rc = -EINVAL; | |
1754 | goto unlock; | |
1755 | } | |
1756 | ||
1757 | if (dasd_probeonly) { | |
1758 | DEV_MESSAGE(KERN_INFO, device, "%s", | |
1759 | "No access to device due to probeonly mode"); | |
1760 | rc = -EPERM; | |
1761 | goto out; | |
1762 | } | |
1763 | ||
90f0094d | 1764 | if (device->state <= DASD_STATE_BASIC) { |
1da177e4 LT |
1765 | DBF_DEV_EVENT(DBF_ERR, device, " %s", |
1766 | " Cannot open unrecognized device"); | |
1767 | rc = -ENODEV; | |
1768 | goto out; | |
1769 | } | |
1770 | ||
1771 | return 0; | |
1772 | ||
1773 | out: | |
1774 | module_put(device->discipline->owner); | |
1775 | unlock: | |
1776 | atomic_dec(&device->open_count); | |
1777 | return rc; | |
1778 | } | |
1779 | ||
1780 | static int | |
1781 | dasd_release(struct inode *inp, struct file *filp) | |
1782 | { | |
1783 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1784 | struct dasd_device *device = disk->private_data; | |
1785 | ||
1786 | atomic_dec(&device->open_count); | |
1787 | module_put(device->discipline->owner); | |
1788 | return 0; | |
1789 | } | |
1790 | ||
a885c8c4 CH |
1791 | /* |
1792 | * Return disk geometry. | |
1793 | */ | |
1794 | static int | |
1795 | dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1796 | { | |
1797 | struct dasd_device *device; | |
1798 | ||
1799 | device = bdev->bd_disk->private_data; | |
1800 | if (!device) | |
1801 | return -ENODEV; | |
1802 | ||
1803 | if (!device->discipline || | |
1804 | !device->discipline->fill_geometry) | |
1805 | return -EINVAL; | |
1806 | ||
1807 | device->discipline->fill_geometry(device, geo); | |
1808 | geo->start = get_start_sect(bdev) >> device->s2b_shift; | |
1809 | return 0; | |
1810 | } | |
1811 | ||
1da177e4 LT |
1812 | struct block_device_operations |
1813 | dasd_device_operations = { | |
1814 | .owner = THIS_MODULE, | |
1815 | .open = dasd_open, | |
1816 | .release = dasd_release, | |
1817 | .ioctl = dasd_ioctl, | |
8262037f | 1818 | .compat_ioctl = dasd_compat_ioctl, |
a885c8c4 | 1819 | .getgeo = dasd_getgeo, |
1da177e4 LT |
1820 | }; |
1821 | ||
1822 | ||
1823 | static void | |
1824 | dasd_exit(void) | |
1825 | { | |
1826 | #ifdef CONFIG_PROC_FS | |
1827 | dasd_proc_exit(); | |
1828 | #endif | |
20c64468 | 1829 | dasd_eer_exit(); |
6bb0e010 HH |
1830 | if (dasd_page_cache != NULL) { |
1831 | kmem_cache_destroy(dasd_page_cache); | |
1832 | dasd_page_cache = NULL; | |
1833 | } | |
1da177e4 LT |
1834 | dasd_gendisk_exit(); |
1835 | dasd_devmap_exit(); | |
1da177e4 LT |
1836 | if (dasd_debug_area != NULL) { |
1837 | debug_unregister(dasd_debug_area); | |
1838 | dasd_debug_area = NULL; | |
1839 | } | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * SECTION: common functions for ccw_driver use | |
1844 | */ | |
1845 | ||
1c01b8a5 HH |
1846 | /* |
1847 | * Initial attempt at a probe function. this can be simplified once | |
1848 | * the other detection code is gone. | |
1849 | */ | |
1da177e4 LT |
1850 | int |
1851 | dasd_generic_probe (struct ccw_device *cdev, | |
1852 | struct dasd_discipline *discipline) | |
1853 | { | |
1854 | int ret; | |
1855 | ||
40545573 HH |
1856 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
1857 | if (ret) { | |
1858 | printk(KERN_WARNING | |
1859 | "dasd_generic_probe: could not set ccw-device options " | |
1860 | "for %s\n", cdev->dev.bus_id); | |
1861 | return ret; | |
1862 | } | |
1da177e4 LT |
1863 | ret = dasd_add_sysfs_files(cdev); |
1864 | if (ret) { | |
1865 | printk(KERN_WARNING | |
1866 | "dasd_generic_probe: could not add sysfs entries " | |
1867 | "for %s\n", cdev->dev.bus_id); | |
40545573 | 1868 | return ret; |
1da177e4 | 1869 | } |
40545573 | 1870 | cdev->handler = &dasd_int_handler; |
1da177e4 | 1871 | |
40545573 HH |
1872 | /* |
1873 | * Automatically online either all dasd devices (dasd_autodetect) | |
1874 | * or all devices specified with dasd= parameters during | |
1875 | * initial probe. | |
1876 | */ | |
1877 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
1878 | (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0)) | |
1879 | ret = ccw_device_set_online(cdev); | |
1880 | if (ret) | |
1881 | printk(KERN_WARNING | |
1882 | "dasd_generic_probe: could not initially online " | |
1883 | "ccw-device %s\n", cdev->dev.bus_id); | |
1da177e4 LT |
1884 | return ret; |
1885 | } | |
1886 | ||
1c01b8a5 HH |
1887 | /* |
1888 | * This will one day be called from a global not_oper handler. | |
1889 | * It is also used by driver_unregister during module unload. | |
1890 | */ | |
1da177e4 LT |
1891 | void |
1892 | dasd_generic_remove (struct ccw_device *cdev) | |
1893 | { | |
1894 | struct dasd_device *device; | |
1895 | ||
59afda78 HH |
1896 | cdev->handler = NULL; |
1897 | ||
1da177e4 LT |
1898 | dasd_remove_sysfs_files(cdev); |
1899 | device = dasd_device_from_cdev(cdev); | |
1900 | if (IS_ERR(device)) | |
1901 | return; | |
1902 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1903 | /* Already doing offline processing */ | |
1904 | dasd_put_device(device); | |
1905 | return; | |
1906 | } | |
1907 | /* | |
1908 | * This device is removed unconditionally. Set offline | |
1909 | * flag to prevent dasd_open from opening it while it is | |
1910 | * no quite down yet. | |
1911 | */ | |
1912 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1913 | /* dasd_delete_device destroys the device reference. */ | |
1914 | dasd_delete_device(device); | |
1915 | } | |
1916 | ||
1c01b8a5 HH |
1917 | /* |
1918 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 1919 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
1920 | * or the user has started activation through sysfs. |
1921 | */ | |
1da177e4 LT |
1922 | int |
1923 | dasd_generic_set_online (struct ccw_device *cdev, | |
aa88861f | 1924 | struct dasd_discipline *base_discipline) |
1da177e4 LT |
1925 | |
1926 | { | |
aa88861f | 1927 | struct dasd_discipline *discipline; |
1da177e4 | 1928 | struct dasd_device *device; |
c6eb7b77 | 1929 | int rc; |
f24acd45 | 1930 | |
40545573 HH |
1931 | /* first online clears initial online feature flag */ |
1932 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
1933 | device = dasd_create_device(cdev); |
1934 | if (IS_ERR(device)) | |
1935 | return PTR_ERR(device); | |
1936 | ||
aa88861f | 1937 | discipline = base_discipline; |
c6eb7b77 | 1938 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
1939 | if (!dasd_diag_discipline_pointer) { |
1940 | printk (KERN_WARNING | |
1941 | "dasd_generic couldn't online device %s " | |
1942 | "- discipline DIAG not available\n", | |
1943 | cdev->dev.bus_id); | |
1944 | dasd_delete_device(device); | |
1945 | return -ENODEV; | |
1946 | } | |
1947 | discipline = dasd_diag_discipline_pointer; | |
1948 | } | |
aa88861f PO |
1949 | if (!try_module_get(base_discipline->owner)) { |
1950 | dasd_delete_device(device); | |
1951 | return -EINVAL; | |
1952 | } | |
1953 | if (!try_module_get(discipline->owner)) { | |
1954 | module_put(base_discipline->owner); | |
1955 | dasd_delete_device(device); | |
1956 | return -EINVAL; | |
1957 | } | |
1958 | device->base_discipline = base_discipline; | |
1da177e4 LT |
1959 | device->discipline = discipline; |
1960 | ||
1961 | rc = discipline->check_device(device); | |
1962 | if (rc) { | |
1963 | printk (KERN_WARNING | |
1964 | "dasd_generic couldn't online device %s " | |
1965 | "with discipline %s rc=%i\n", | |
1966 | cdev->dev.bus_id, discipline->name, rc); | |
aa88861f PO |
1967 | module_put(discipline->owner); |
1968 | module_put(base_discipline->owner); | |
1da177e4 LT |
1969 | dasd_delete_device(device); |
1970 | return rc; | |
1971 | } | |
1972 | ||
1973 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
1974 | if (device->state <= DASD_STATE_KNOWN) { | |
1975 | printk (KERN_WARNING | |
1976 | "dasd_generic discipline not found for %s\n", | |
1977 | cdev->dev.bus_id); | |
1978 | rc = -ENODEV; | |
1979 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1980 | dasd_delete_device(device); | |
1981 | } else | |
1982 | pr_debug("dasd_generic device %s found\n", | |
1983 | cdev->dev.bus_id); | |
1984 | ||
1985 | /* FIXME: we have to wait for the root device but we don't want | |
1986 | * to wait for each single device but for all at once. */ | |
1987 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
1988 | ||
1989 | dasd_put_device(device); | |
1990 | ||
1991 | return rc; | |
1992 | } | |
1993 | ||
1994 | int | |
1995 | dasd_generic_set_offline (struct ccw_device *cdev) | |
1996 | { | |
1997 | struct dasd_device *device; | |
dafd87aa | 1998 | int max_count, open_count; |
1da177e4 LT |
1999 | |
2000 | device = dasd_device_from_cdev(cdev); | |
2001 | if (IS_ERR(device)) | |
2002 | return PTR_ERR(device); | |
2003 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2004 | /* Already doing offline processing */ | |
2005 | dasd_put_device(device); | |
2006 | return 0; | |
2007 | } | |
2008 | /* | |
2009 | * We must make sure that this device is currently not in use. | |
2010 | * The open_count is increased for every opener, that includes | |
2011 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2012 | * in the other openers. | |
2013 | */ | |
2014 | max_count = device->bdev ? 0 : -1; | |
dafd87aa HH |
2015 | open_count = (int) atomic_read(&device->open_count); |
2016 | if (open_count > max_count) { | |
2017 | if (open_count > 0) | |
2018 | printk (KERN_WARNING "Can't offline dasd device with " | |
2019 | "open count = %i.\n", | |
2020 | open_count); | |
2021 | else | |
2022 | printk (KERN_WARNING "%s", | |
2023 | "Can't offline dasd device due to internal " | |
2024 | "use\n"); | |
1da177e4 LT |
2025 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2026 | dasd_put_device(device); | |
2027 | return -EBUSY; | |
2028 | } | |
2029 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2030 | /* dasd_delete_device destroys the device reference. */ | |
2031 | dasd_delete_device(device); | |
2032 | ||
2033 | return 0; | |
2034 | } | |
2035 | ||
2036 | int | |
2037 | dasd_generic_notify(struct ccw_device *cdev, int event) | |
2038 | { | |
2039 | struct dasd_device *device; | |
2040 | struct dasd_ccw_req *cqr; | |
2041 | unsigned long flags; | |
2042 | int ret; | |
2043 | ||
2044 | device = dasd_device_from_cdev(cdev); | |
2045 | if (IS_ERR(device)) | |
2046 | return 0; | |
2047 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
2048 | ret = 0; | |
2049 | switch (event) { | |
2050 | case CIO_GONE: | |
2051 | case CIO_NO_PATH: | |
20c64468 SW |
2052 | /* First of all call extended error reporting. */ |
2053 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2054 | ||
1da177e4 LT |
2055 | if (device->state < DASD_STATE_BASIC) |
2056 | break; | |
2057 | /* Device is active. We want to keep it. */ | |
2058 | if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) { | |
2059 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2060 | if (cqr->status == DASD_CQR_IN_IO) | |
2061 | cqr->status = DASD_CQR_FAILED; | |
2062 | device->stopped |= DASD_STOPPED_DC_EIO; | |
1da177e4 LT |
2063 | } else { |
2064 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
2065 | if (cqr->status == DASD_CQR_IN_IO) { | |
2066 | cqr->status = DASD_CQR_QUEUED; | |
2067 | cqr->retries++; | |
2068 | } | |
2069 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2070 | dasd_set_timer(device, 0); | |
2071 | } | |
1c01b8a5 | 2072 | dasd_schedule_bh(device); |
1da177e4 LT |
2073 | ret = 1; |
2074 | break; | |
2075 | case CIO_OPER: | |
2076 | /* FIXME: add a sanity check. */ | |
2077 | device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO); | |
2078 | dasd_schedule_bh(device); | |
2079 | ret = 1; | |
2080 | break; | |
2081 | } | |
2082 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
2083 | dasd_put_device(device); | |
2084 | return ret; | |
2085 | } | |
2086 | ||
20c64468 | 2087 | |
1da177e4 LT |
2088 | static int __init |
2089 | dasd_init(void) | |
2090 | { | |
2091 | int rc; | |
2092 | ||
2093 | init_waitqueue_head(&dasd_init_waitq); | |
2094 | ||
2095 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
66a464db | 2096 | dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long)); |
1da177e4 LT |
2097 | if (dasd_debug_area == NULL) { |
2098 | rc = -ENOMEM; | |
2099 | goto failed; | |
2100 | } | |
2101 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
2102 | debug_set_level(dasd_debug_area, DBF_EMERG); | |
2103 | ||
2104 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2105 | ||
2106 | dasd_diag_discipline_pointer = NULL; | |
2107 | ||
1da177e4 LT |
2108 | rc = dasd_devmap_init(); |
2109 | if (rc) | |
2110 | goto failed; | |
2111 | rc = dasd_gendisk_init(); | |
2112 | if (rc) | |
2113 | goto failed; | |
2114 | rc = dasd_parse(); | |
2115 | if (rc) | |
2116 | goto failed; | |
20c64468 SW |
2117 | rc = dasd_eer_init(); |
2118 | if (rc) | |
2119 | goto failed; | |
1da177e4 LT |
2120 | #ifdef CONFIG_PROC_FS |
2121 | rc = dasd_proc_init(); | |
2122 | if (rc) | |
2123 | goto failed; | |
2124 | #endif | |
2125 | ||
2126 | return 0; | |
2127 | failed: | |
2128 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2129 | dasd_exit(); | |
2130 | return rc; | |
2131 | } | |
2132 | ||
2133 | module_init(dasd_init); | |
2134 | module_exit(dasd_exit); | |
2135 | ||
2136 | EXPORT_SYMBOL(dasd_debug_area); | |
2137 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2138 | ||
2139 | EXPORT_SYMBOL(dasd_add_request_head); | |
2140 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2141 | EXPORT_SYMBOL(dasd_cancel_req); | |
2142 | EXPORT_SYMBOL(dasd_clear_timer); | |
2143 | EXPORT_SYMBOL(dasd_enable_device); | |
2144 | EXPORT_SYMBOL(dasd_int_handler); | |
2145 | EXPORT_SYMBOL(dasd_kfree_request); | |
2146 | EXPORT_SYMBOL(dasd_kick_device); | |
2147 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
2148 | EXPORT_SYMBOL(dasd_schedule_bh); | |
2149 | EXPORT_SYMBOL(dasd_set_target_state); | |
2150 | EXPORT_SYMBOL(dasd_set_timer); | |
2151 | EXPORT_SYMBOL(dasd_sfree_request); | |
2152 | EXPORT_SYMBOL(dasd_sleep_on); | |
2153 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2154 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2155 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2156 | EXPORT_SYMBOL(dasd_start_IO); | |
2157 | EXPORT_SYMBOL(dasd_term_IO); | |
2158 | ||
2159 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2160 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2161 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2162 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2163 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
1da177e4 | 2164 |