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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 | * | |
973bd993 | 10 | * $Revision: 1.169 $ |
1da177e4 LT |
11 | */ |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/kmod.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/buffer_head.h> | |
21 | ||
22 | #include <asm/ccwdev.h> | |
23 | #include <asm/ebcdic.h> | |
24 | #include <asm/idals.h> | |
25 | #include <asm/todclk.h> | |
26 | ||
27 | /* This is ugly... */ | |
28 | #define PRINTK_HEADER "dasd:" | |
29 | ||
30 | #include "dasd_int.h" | |
31 | /* | |
32 | * SECTION: Constant definitions to be used within this file | |
33 | */ | |
34 | #define DASD_CHANQ_MAX_SIZE 4 | |
35 | ||
36 | /* | |
37 | * SECTION: exported variables of dasd.c | |
38 | */ | |
39 | debug_info_t *dasd_debug_area; | |
40 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
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"); | |
46 | MODULE_PARM(dasd, "1-" __MODULE_STRING(256) "s"); | |
47 | MODULE_LICENSE("GPL"); | |
48 | ||
49 | /* | |
50 | * SECTION: prototypes for static functions of dasd.c | |
51 | */ | |
52 | static int dasd_alloc_queue(struct dasd_device * device); | |
53 | static void dasd_setup_queue(struct dasd_device * device); | |
54 | static void dasd_free_queue(struct dasd_device * device); | |
55 | static void dasd_flush_request_queue(struct dasd_device *); | |
56 | static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); | |
57 | static void dasd_flush_ccw_queue(struct dasd_device *, int); | |
58 | static void dasd_tasklet(struct dasd_device *); | |
59 | static void do_kick_device(void *data); | |
60 | ||
61 | /* | |
62 | * SECTION: Operations on the device structure. | |
63 | */ | |
64 | static wait_queue_head_t dasd_init_waitq; | |
65 | ||
66 | /* | |
67 | * Allocate memory for a new device structure. | |
68 | */ | |
69 | struct dasd_device * | |
70 | dasd_alloc_device(void) | |
71 | { | |
72 | struct dasd_device *device; | |
73 | ||
74 | device = kmalloc(sizeof (struct dasd_device), GFP_ATOMIC); | |
75 | if (device == NULL) | |
76 | return ERR_PTR(-ENOMEM); | |
77 | memset(device, 0, sizeof (struct dasd_device)); | |
78 | /* open_count = 0 means device online but not in use */ | |
79 | atomic_set(&device->open_count, -1); | |
80 | ||
81 | /* Get two pages for normal block device operations. */ | |
82 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
83 | if (device->ccw_mem == NULL) { | |
84 | kfree(device); | |
85 | return ERR_PTR(-ENOMEM); | |
86 | } | |
87 | /* Get one page for error recovery. */ | |
88 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
89 | if (device->erp_mem == NULL) { | |
90 | free_pages((unsigned long) device->ccw_mem, 1); | |
91 | kfree(device); | |
92 | return ERR_PTR(-ENOMEM); | |
93 | } | |
94 | ||
95 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
96 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
97 | spin_lock_init(&device->mem_lock); | |
98 | spin_lock_init(&device->request_queue_lock); | |
99 | atomic_set (&device->tasklet_scheduled, 0); | |
100 | tasklet_init(&device->tasklet, | |
101 | (void (*)(unsigned long)) dasd_tasklet, | |
102 | (unsigned long) device); | |
103 | INIT_LIST_HEAD(&device->ccw_queue); | |
104 | init_timer(&device->timer); | |
105 | INIT_WORK(&device->kick_work, do_kick_device, device); | |
106 | device->state = DASD_STATE_NEW; | |
107 | device->target = DASD_STATE_NEW; | |
108 | ||
109 | return device; | |
110 | } | |
111 | ||
112 | /* | |
113 | * Free memory of a device structure. | |
114 | */ | |
115 | void | |
116 | dasd_free_device(struct dasd_device *device) | |
117 | { | |
17fd682e | 118 | kfree(device->private); |
1da177e4 LT |
119 | free_page((unsigned long) device->erp_mem); |
120 | free_pages((unsigned long) device->ccw_mem, 1); | |
121 | kfree(device); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Make a new device known to the system. | |
126 | */ | |
127 | static inline int | |
128 | dasd_state_new_to_known(struct dasd_device *device) | |
129 | { | |
130 | int rc; | |
131 | ||
132 | /* | |
133 | * As long as the device is not in state DASD_STATE_NEW we want to | |
134 | * keep the reference count > 0. | |
135 | */ | |
136 | dasd_get_device(device); | |
137 | ||
138 | rc = dasd_alloc_queue(device); | |
139 | if (rc) { | |
140 | dasd_put_device(device); | |
141 | return rc; | |
142 | } | |
143 | ||
144 | device->state = DASD_STATE_KNOWN; | |
145 | return 0; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Let the system forget about a device. | |
150 | */ | |
151 | static inline void | |
152 | dasd_state_known_to_new(struct dasd_device * device) | |
153 | { | |
154 | /* Forget the discipline information. */ | |
155 | device->discipline = NULL; | |
156 | device->state = DASD_STATE_NEW; | |
157 | ||
158 | dasd_free_queue(device); | |
159 | ||
160 | /* Give up reference we took in dasd_state_new_to_known. */ | |
161 | dasd_put_device(device); | |
162 | } | |
163 | ||
164 | /* | |
165 | * Request the irq line for the device. | |
166 | */ | |
167 | static inline int | |
168 | dasd_state_known_to_basic(struct dasd_device * device) | |
169 | { | |
170 | int rc; | |
171 | ||
172 | /* Allocate and register gendisk structure. */ | |
173 | rc = dasd_gendisk_alloc(device); | |
174 | if (rc) | |
175 | return rc; | |
176 | ||
177 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ | |
66a464db | 178 | device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 2, |
1da177e4 LT |
179 | 8 * sizeof (long)); |
180 | debug_register_view(device->debug_area, &debug_sprintf_view); | |
181 | debug_set_level(device->debug_area, DBF_EMERG); | |
182 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); | |
183 | ||
184 | device->state = DASD_STATE_BASIC; | |
185 | return 0; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Release the irq line for the device. Terminate any running i/o. | |
190 | */ | |
191 | static inline void | |
192 | dasd_state_basic_to_known(struct dasd_device * device) | |
193 | { | |
194 | dasd_gendisk_free(device); | |
195 | dasd_flush_ccw_queue(device, 1); | |
196 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); | |
197 | if (device->debug_area != NULL) { | |
198 | debug_unregister(device->debug_area); | |
199 | device->debug_area = NULL; | |
200 | } | |
201 | device->state = DASD_STATE_KNOWN; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Do the initial analysis. The do_analysis function may return | |
206 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
207 | * until the discipline decides to continue the startup sequence | |
208 | * by calling the function dasd_change_state. The eckd disciplines | |
209 | * uses this to start a ccw that detects the format. The completion | |
210 | * interrupt for this detection ccw uses the kernel event daemon to | |
211 | * trigger the call to dasd_change_state. All this is done in the | |
212 | * discipline code, see dasd_eckd.c. | |
213 | * After the analysis ccw is done (do_analysis returned 0 or error) | |
214 | * the block device is setup. Either a fake disk is added to allow | |
215 | * formatting or a proper device request queue is created. | |
216 | */ | |
217 | static inline int | |
218 | dasd_state_basic_to_ready(struct dasd_device * device) | |
219 | { | |
220 | int rc; | |
221 | ||
222 | rc = 0; | |
223 | if (device->discipline->do_analysis != NULL) | |
224 | rc = device->discipline->do_analysis(device); | |
225 | if (rc) | |
226 | return rc; | |
227 | dasd_setup_queue(device); | |
228 | device->state = DASD_STATE_READY; | |
229 | if (dasd_scan_partitions(device) != 0) | |
230 | device->state = DASD_STATE_BASIC; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Remove device from block device layer. Destroy dirty buffers. | |
236 | * Forget format information. Check if the target level is basic | |
237 | * and if it is create fake disk for formatting. | |
238 | */ | |
239 | static inline void | |
240 | dasd_state_ready_to_basic(struct dasd_device * device) | |
241 | { | |
242 | dasd_flush_ccw_queue(device, 0); | |
243 | dasd_destroy_partitions(device); | |
244 | dasd_flush_request_queue(device); | |
245 | device->blocks = 0; | |
246 | device->bp_block = 0; | |
247 | device->s2b_shift = 0; | |
248 | device->state = DASD_STATE_BASIC; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Make the device online and schedule the bottom half to start | |
253 | * the requeueing of requests from the linux request queue to the | |
254 | * ccw queue. | |
255 | */ | |
256 | static inline int | |
257 | dasd_state_ready_to_online(struct dasd_device * device) | |
258 | { | |
259 | device->state = DASD_STATE_ONLINE; | |
260 | dasd_schedule_bh(device); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Stop the requeueing of requests again. | |
266 | */ | |
267 | static inline void | |
268 | dasd_state_online_to_ready(struct dasd_device * device) | |
269 | { | |
270 | device->state = DASD_STATE_READY; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Device startup state changes. | |
275 | */ | |
276 | static inline int | |
277 | dasd_increase_state(struct dasd_device *device) | |
278 | { | |
279 | int rc; | |
280 | ||
281 | rc = 0; | |
282 | if (device->state == DASD_STATE_NEW && | |
283 | device->target >= DASD_STATE_KNOWN) | |
284 | rc = dasd_state_new_to_known(device); | |
285 | ||
286 | if (!rc && | |
287 | device->state == DASD_STATE_KNOWN && | |
288 | device->target >= DASD_STATE_BASIC) | |
289 | rc = dasd_state_known_to_basic(device); | |
290 | ||
291 | if (!rc && | |
292 | device->state == DASD_STATE_BASIC && | |
293 | device->target >= DASD_STATE_READY) | |
294 | rc = dasd_state_basic_to_ready(device); | |
295 | ||
296 | if (!rc && | |
297 | device->state == DASD_STATE_READY && | |
298 | device->target >= DASD_STATE_ONLINE) | |
299 | rc = dasd_state_ready_to_online(device); | |
300 | ||
301 | return rc; | |
302 | } | |
303 | ||
304 | /* | |
305 | * Device shutdown state changes. | |
306 | */ | |
307 | static inline int | |
308 | dasd_decrease_state(struct dasd_device *device) | |
309 | { | |
310 | if (device->state == DASD_STATE_ONLINE && | |
311 | device->target <= DASD_STATE_READY) | |
312 | dasd_state_online_to_ready(device); | |
313 | ||
314 | if (device->state == DASD_STATE_READY && | |
315 | device->target <= DASD_STATE_BASIC) | |
316 | dasd_state_ready_to_basic(device); | |
317 | ||
318 | if (device->state == DASD_STATE_BASIC && | |
319 | device->target <= DASD_STATE_KNOWN) | |
320 | dasd_state_basic_to_known(device); | |
321 | ||
322 | if (device->state == DASD_STATE_KNOWN && | |
323 | device->target <= DASD_STATE_NEW) | |
324 | dasd_state_known_to_new(device); | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | /* | |
330 | * This is the main startup/shutdown routine. | |
331 | */ | |
332 | static void | |
333 | dasd_change_state(struct dasd_device *device) | |
334 | { | |
335 | int rc; | |
336 | ||
337 | if (device->state == device->target) | |
338 | /* Already where we want to go today... */ | |
339 | return; | |
340 | if (device->state < device->target) | |
341 | rc = dasd_increase_state(device); | |
342 | else | |
343 | rc = dasd_decrease_state(device); | |
344 | if (rc && rc != -EAGAIN) | |
345 | device->target = device->state; | |
346 | ||
347 | if (device->state == device->target) | |
348 | wake_up(&dasd_init_waitq); | |
349 | } | |
350 | ||
351 | /* | |
352 | * Kick starter for devices that did not complete the startup/shutdown | |
353 | * procedure or were sleeping because of a pending state. | |
354 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
355 | * event daemon. | |
356 | */ | |
357 | static void | |
358 | do_kick_device(void *data) | |
359 | { | |
360 | struct dasd_device *device; | |
361 | ||
362 | device = (struct dasd_device *) data; | |
363 | dasd_change_state(device); | |
364 | dasd_schedule_bh(device); | |
365 | dasd_put_device(device); | |
366 | } | |
367 | ||
368 | void | |
369 | dasd_kick_device(struct dasd_device *device) | |
370 | { | |
371 | dasd_get_device(device); | |
372 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
373 | schedule_work(&device->kick_work); | |
374 | } | |
375 | ||
376 | /* | |
377 | * Set the target state for a device and starts the state change. | |
378 | */ | |
379 | void | |
380 | dasd_set_target_state(struct dasd_device *device, int target) | |
381 | { | |
382 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
383 | if (dasd_probeonly && target > DASD_STATE_READY) | |
384 | target = DASD_STATE_READY; | |
385 | if (device->target != target) { | |
386 | if (device->state == target) | |
387 | wake_up(&dasd_init_waitq); | |
388 | device->target = target; | |
389 | } | |
390 | if (device->state != device->target) | |
391 | dasd_change_state(device); | |
392 | } | |
393 | ||
394 | /* | |
395 | * Enable devices with device numbers in [from..to]. | |
396 | */ | |
397 | static inline int | |
398 | _wait_for_device(struct dasd_device *device) | |
399 | { | |
400 | return (device->state == device->target); | |
401 | } | |
402 | ||
403 | void | |
404 | dasd_enable_device(struct dasd_device *device) | |
405 | { | |
406 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
407 | if (device->state <= DASD_STATE_KNOWN) | |
408 | /* No discipline for device found. */ | |
409 | dasd_set_target_state(device, DASD_STATE_NEW); | |
410 | /* Now wait for the devices to come up. */ | |
411 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
412 | } | |
413 | ||
414 | /* | |
415 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
416 | */ | |
417 | #ifdef CONFIG_DASD_PROFILE | |
418 | ||
419 | struct dasd_profile_info_t dasd_global_profile; | |
420 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
421 | ||
422 | /* | |
423 | * Increments counter in global and local profiling structures. | |
424 | */ | |
425 | #define dasd_profile_counter(value, counter, device) \ | |
426 | { \ | |
427 | int index; \ | |
428 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
429 | dasd_global_profile.counter[index]++; \ | |
430 | device->profile.counter[index]++; \ | |
431 | } | |
432 | ||
433 | /* | |
434 | * Add profiling information for cqr before execution. | |
435 | */ | |
436 | static inline void | |
437 | dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
438 | struct request *req) | |
439 | { | |
440 | struct list_head *l; | |
441 | unsigned int counter; | |
442 | ||
443 | if (dasd_profile_level != DASD_PROFILE_ON) | |
444 | return; | |
445 | ||
446 | /* count the length of the chanq for statistics */ | |
447 | counter = 0; | |
448 | list_for_each(l, &device->ccw_queue) | |
449 | if (++counter >= 31) | |
450 | break; | |
451 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
452 | device->profile.dasd_io_nr_req[counter]++; | |
453 | } | |
454 | ||
455 | /* | |
456 | * Add profiling information for cqr after execution. | |
457 | */ | |
458 | static inline void | |
459 | dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
460 | struct request *req) | |
461 | { | |
462 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
463 | long tottimeps, sectors; | |
464 | ||
465 | if (dasd_profile_level != DASD_PROFILE_ON) | |
466 | return; | |
467 | ||
468 | sectors = req->nr_sectors; | |
469 | if (!cqr->buildclk || !cqr->startclk || | |
470 | !cqr->stopclk || !cqr->endclk || | |
471 | !sectors) | |
472 | return; | |
473 | ||
474 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
475 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
476 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
477 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
478 | tottimeps = tottime / sectors; | |
479 | ||
480 | if (!dasd_global_profile.dasd_io_reqs) | |
481 | memset(&dasd_global_profile, 0, | |
482 | sizeof (struct dasd_profile_info_t)); | |
483 | dasd_global_profile.dasd_io_reqs++; | |
484 | dasd_global_profile.dasd_io_sects += sectors; | |
485 | ||
486 | if (!device->profile.dasd_io_reqs) | |
487 | memset(&device->profile, 0, | |
488 | sizeof (struct dasd_profile_info_t)); | |
489 | device->profile.dasd_io_reqs++; | |
490 | device->profile.dasd_io_sects += sectors; | |
491 | ||
492 | dasd_profile_counter(sectors, dasd_io_secs, device); | |
493 | dasd_profile_counter(tottime, dasd_io_times, device); | |
494 | dasd_profile_counter(tottimeps, dasd_io_timps, device); | |
495 | dasd_profile_counter(strtime, dasd_io_time1, device); | |
496 | dasd_profile_counter(irqtime, dasd_io_time2, device); | |
497 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device); | |
498 | dasd_profile_counter(endtime, dasd_io_time3, device); | |
499 | } | |
500 | #else | |
501 | #define dasd_profile_start(device, cqr, req) do {} while (0) | |
502 | #define dasd_profile_end(device, cqr, req) do {} while (0) | |
503 | #endif /* CONFIG_DASD_PROFILE */ | |
504 | ||
505 | /* | |
506 | * Allocate memory for a channel program with 'cplength' channel | |
507 | * command words and 'datasize' additional space. There are two | |
508 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
509 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
510 | * that gets allocated for each device. | |
511 | */ | |
512 | struct dasd_ccw_req * | |
513 | dasd_kmalloc_request(char *magic, int cplength, int datasize, | |
514 | struct dasd_device * device) | |
515 | { | |
516 | struct dasd_ccw_req *cqr; | |
517 | ||
518 | /* Sanity checks */ | |
519 | if ( magic == NULL || datasize > PAGE_SIZE || | |
520 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
521 | BUG(); | |
522 | ||
523 | cqr = kmalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); | |
524 | if (cqr == NULL) | |
525 | return ERR_PTR(-ENOMEM); | |
526 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
527 | cqr->cpaddr = NULL; | |
528 | if (cplength > 0) { | |
529 | cqr->cpaddr = kmalloc(cplength*sizeof(struct ccw1), | |
530 | GFP_ATOMIC | GFP_DMA); | |
531 | if (cqr->cpaddr == NULL) { | |
532 | kfree(cqr); | |
533 | return ERR_PTR(-ENOMEM); | |
534 | } | |
535 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
536 | } | |
537 | cqr->data = NULL; | |
538 | if (datasize > 0) { | |
539 | cqr->data = kmalloc(datasize, GFP_ATOMIC | GFP_DMA); | |
540 | if (cqr->data == NULL) { | |
17fd682e | 541 | kfree(cqr->cpaddr); |
1da177e4 LT |
542 | kfree(cqr); |
543 | return ERR_PTR(-ENOMEM); | |
544 | } | |
545 | memset(cqr->data, 0, datasize); | |
546 | } | |
547 | strncpy((char *) &cqr->magic, magic, 4); | |
548 | ASCEBC((char *) &cqr->magic, 4); | |
549 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
550 | dasd_get_device(device); | |
551 | return cqr; | |
552 | } | |
553 | ||
554 | struct dasd_ccw_req * | |
555 | dasd_smalloc_request(char *magic, int cplength, int datasize, | |
556 | struct dasd_device * device) | |
557 | { | |
558 | unsigned long flags; | |
559 | struct dasd_ccw_req *cqr; | |
560 | char *data; | |
561 | int size; | |
562 | ||
563 | /* Sanity checks */ | |
564 | if ( magic == NULL || datasize > PAGE_SIZE || | |
565 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
566 | BUG(); | |
567 | ||
568 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
569 | if (cplength > 0) | |
570 | size += cplength * sizeof(struct ccw1); | |
571 | if (datasize > 0) | |
572 | size += datasize; | |
573 | spin_lock_irqsave(&device->mem_lock, flags); | |
574 | cqr = (struct dasd_ccw_req *) | |
575 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
576 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
577 | if (cqr == NULL) | |
578 | return ERR_PTR(-ENOMEM); | |
579 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
580 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
581 | cqr->cpaddr = NULL; | |
582 | if (cplength > 0) { | |
583 | cqr->cpaddr = (struct ccw1 *) data; | |
584 | data += cplength*sizeof(struct ccw1); | |
585 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
586 | } | |
587 | cqr->data = NULL; | |
588 | if (datasize > 0) { | |
589 | cqr->data = data; | |
590 | memset(cqr->data, 0, datasize); | |
591 | } | |
592 | strncpy((char *) &cqr->magic, magic, 4); | |
593 | ASCEBC((char *) &cqr->magic, 4); | |
594 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
595 | dasd_get_device(device); | |
596 | return cqr; | |
597 | } | |
598 | ||
599 | /* | |
600 | * Free memory of a channel program. This function needs to free all the | |
601 | * idal lists that might have been created by dasd_set_cda and the | |
602 | * struct dasd_ccw_req itself. | |
603 | */ | |
604 | void | |
605 | dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
606 | { | |
607 | #ifdef CONFIG_ARCH_S390X | |
608 | struct ccw1 *ccw; | |
609 | ||
610 | /* Clear any idals used for the request. */ | |
611 | ccw = cqr->cpaddr; | |
612 | do { | |
613 | clear_normalized_cda(ccw); | |
614 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
615 | #endif | |
17fd682e JJ |
616 | kfree(cqr->cpaddr); |
617 | kfree(cqr->data); | |
1da177e4 LT |
618 | kfree(cqr); |
619 | dasd_put_device(device); | |
620 | } | |
621 | ||
622 | void | |
623 | dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
624 | { | |
625 | unsigned long flags; | |
626 | ||
627 | spin_lock_irqsave(&device->mem_lock, flags); | |
628 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
629 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
630 | dasd_put_device(device); | |
631 | } | |
632 | ||
633 | /* | |
634 | * Check discipline magic in cqr. | |
635 | */ | |
636 | static inline int | |
637 | dasd_check_cqr(struct dasd_ccw_req *cqr) | |
638 | { | |
639 | struct dasd_device *device; | |
640 | ||
641 | if (cqr == NULL) | |
642 | return -EINVAL; | |
643 | device = cqr->device; | |
644 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { | |
645 | DEV_MESSAGE(KERN_WARNING, device, | |
646 | " dasd_ccw_req 0x%08x magic doesn't match" | |
647 | " discipline 0x%08x", | |
648 | cqr->magic, | |
649 | *(unsigned int *) device->discipline->name); | |
650 | return -EINVAL; | |
651 | } | |
652 | return 0; | |
653 | } | |
654 | ||
655 | /* | |
656 | * Terminate the current i/o and set the request to clear_pending. | |
657 | * Timer keeps device runnig. | |
658 | * ccw_device_clear can fail if the i/o subsystem | |
659 | * is in a bad mood. | |
660 | */ | |
661 | int | |
662 | dasd_term_IO(struct dasd_ccw_req * cqr) | |
663 | { | |
664 | struct dasd_device *device; | |
665 | int retries, rc; | |
666 | ||
667 | /* Check the cqr */ | |
668 | rc = dasd_check_cqr(cqr); | |
669 | if (rc) | |
670 | return rc; | |
671 | retries = 0; | |
672 | device = (struct dasd_device *) cqr->device; | |
673 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { | |
674 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
675 | switch (rc) { | |
676 | case 0: /* termination successful */ | |
677 | if (cqr->retries > 0) { | |
678 | cqr->retries--; | |
679 | cqr->status = DASD_CQR_CLEAR; | |
680 | } else | |
681 | cqr->status = DASD_CQR_FAILED; | |
682 | cqr->stopclk = get_clock(); | |
683 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
684 | "terminate cqr %p successful", | |
685 | cqr); | |
686 | break; | |
687 | case -ENODEV: | |
688 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
689 | "device gone, retry"); | |
690 | break; | |
691 | case -EIO: | |
692 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
693 | "I/O error, retry"); | |
694 | break; | |
695 | case -EINVAL: | |
696 | case -EBUSY: | |
697 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
698 | "device busy, retry later"); | |
699 | break; | |
700 | default: | |
701 | DEV_MESSAGE(KERN_ERR, device, | |
702 | "line %d unknown RC=%d, please " | |
703 | "report to linux390@de.ibm.com", | |
704 | __LINE__, rc); | |
705 | BUG(); | |
706 | break; | |
707 | } | |
708 | retries++; | |
709 | } | |
710 | dasd_schedule_bh(device); | |
711 | return rc; | |
712 | } | |
713 | ||
714 | /* | |
715 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
716 | * In that case set up a timer to start the request later. | |
717 | */ | |
718 | int | |
719 | dasd_start_IO(struct dasd_ccw_req * cqr) | |
720 | { | |
721 | struct dasd_device *device; | |
722 | int rc; | |
723 | ||
724 | /* Check the cqr */ | |
725 | rc = dasd_check_cqr(cqr); | |
726 | if (rc) | |
727 | return rc; | |
728 | device = (struct dasd_device *) cqr->device; | |
729 | if (cqr->retries < 0) { | |
730 | DEV_MESSAGE(KERN_DEBUG, device, | |
731 | "start_IO: request %p (%02x/%i) - no retry left.", | |
732 | cqr, cqr->status, cqr->retries); | |
733 | cqr->status = DASD_CQR_FAILED; | |
734 | return -EIO; | |
735 | } | |
736 | cqr->startclk = get_clock(); | |
737 | cqr->starttime = jiffies; | |
738 | cqr->retries--; | |
739 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
740 | cqr->lpm, 0); | |
741 | switch (rc) { | |
742 | case 0: | |
743 | cqr->status = DASD_CQR_IN_IO; | |
744 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
745 | "start_IO: request %p started successful", | |
746 | cqr); | |
747 | break; | |
748 | case -EBUSY: | |
749 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
750 | "start_IO: device busy, retry later"); | |
751 | break; | |
752 | case -ETIMEDOUT: | |
753 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
754 | "start_IO: request timeout, retry later"); | |
755 | break; | |
756 | case -EACCES: | |
757 | /* -EACCES indicates that the request used only a | |
758 | * subset of the available pathes and all these | |
759 | * pathes are gone. | |
760 | * Do a retry with all available pathes. | |
761 | */ | |
762 | cqr->lpm = LPM_ANYPATH; | |
763 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
764 | "start_IO: selected pathes gone," | |
765 | " retry on all pathes"); | |
766 | break; | |
767 | case -ENODEV: | |
768 | case -EIO: | |
769 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
770 | "start_IO: device gone, retry"); | |
771 | break; | |
772 | default: | |
773 | DEV_MESSAGE(KERN_ERR, device, | |
774 | "line %d unknown RC=%d, please report" | |
775 | " to linux390@de.ibm.com", __LINE__, rc); | |
776 | BUG(); | |
777 | break; | |
778 | } | |
779 | return rc; | |
780 | } | |
781 | ||
782 | /* | |
783 | * Timeout function for dasd devices. This is used for different purposes | |
784 | * 1) missing interrupt handler for normal operation | |
785 | * 2) delayed start of request where start_IO failed with -EBUSY | |
786 | * 3) timeout for missing state change interrupts | |
787 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
788 | * DASD_CQR_QUEUED for 2) and 3). | |
789 | */ | |
790 | static void | |
791 | dasd_timeout_device(unsigned long ptr) | |
792 | { | |
793 | unsigned long flags; | |
794 | struct dasd_device *device; | |
795 | ||
796 | device = (struct dasd_device *) ptr; | |
797 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
798 | /* re-activate request queue */ | |
799 | device->stopped &= ~DASD_STOPPED_PENDING; | |
800 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
801 | dasd_schedule_bh(device); | |
802 | } | |
803 | ||
804 | /* | |
805 | * Setup timeout for a device in jiffies. | |
806 | */ | |
807 | void | |
808 | dasd_set_timer(struct dasd_device *device, int expires) | |
809 | { | |
810 | if (expires == 0) { | |
811 | if (timer_pending(&device->timer)) | |
812 | del_timer(&device->timer); | |
813 | return; | |
814 | } | |
815 | if (timer_pending(&device->timer)) { | |
816 | if (mod_timer(&device->timer, jiffies + expires)) | |
817 | return; | |
818 | } | |
819 | device->timer.function = dasd_timeout_device; | |
820 | device->timer.data = (unsigned long) device; | |
821 | device->timer.expires = jiffies + expires; | |
822 | add_timer(&device->timer); | |
823 | } | |
824 | ||
825 | /* | |
826 | * Clear timeout for a device. | |
827 | */ | |
828 | void | |
829 | dasd_clear_timer(struct dasd_device *device) | |
830 | { | |
831 | if (timer_pending(&device->timer)) | |
832 | del_timer(&device->timer); | |
833 | } | |
834 | ||
835 | static void | |
836 | dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm) | |
837 | { | |
838 | struct dasd_ccw_req *cqr; | |
839 | struct dasd_device *device; | |
840 | ||
841 | cqr = (struct dasd_ccw_req *) intparm; | |
842 | if (cqr->status != DASD_CQR_IN_IO) { | |
843 | MESSAGE(KERN_DEBUG, | |
844 | "invalid status in handle_killed_request: " | |
845 | "bus_id %s, status %02x", | |
846 | cdev->dev.bus_id, cqr->status); | |
847 | return; | |
848 | } | |
849 | ||
850 | device = (struct dasd_device *) cqr->device; | |
851 | if (device == NULL || | |
852 | device != dasd_device_from_cdev(cdev) || | |
853 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
854 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
855 | cdev->dev.bus_id); | |
856 | return; | |
857 | } | |
858 | ||
859 | /* Schedule request to be retried. */ | |
860 | cqr->status = DASD_CQR_QUEUED; | |
861 | ||
862 | dasd_clear_timer(device); | |
863 | dasd_schedule_bh(device); | |
864 | dasd_put_device(device); | |
865 | } | |
866 | ||
867 | static void | |
868 | dasd_handle_state_change_pending(struct dasd_device *device) | |
869 | { | |
870 | struct dasd_ccw_req *cqr; | |
871 | struct list_head *l, *n; | |
872 | ||
873 | device->stopped &= ~DASD_STOPPED_PENDING; | |
874 | ||
875 | /* restart all 'running' IO on queue */ | |
876 | list_for_each_safe(l, n, &device->ccw_queue) { | |
877 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
878 | if (cqr->status == DASD_CQR_IN_IO) { | |
879 | cqr->status = DASD_CQR_QUEUED; | |
880 | } | |
881 | } | |
882 | dasd_clear_timer(device); | |
883 | dasd_schedule_bh(device); | |
884 | } | |
885 | ||
886 | /* | |
887 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
888 | */ | |
889 | void | |
890 | dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
891 | struct irb *irb) | |
892 | { | |
893 | struct dasd_ccw_req *cqr, *next; | |
894 | struct dasd_device *device; | |
895 | unsigned long long now; | |
896 | int expires; | |
897 | dasd_era_t era; | |
898 | char mask; | |
899 | ||
900 | if (IS_ERR(irb)) { | |
901 | switch (PTR_ERR(irb)) { | |
902 | case -EIO: | |
903 | dasd_handle_killed_request(cdev, intparm); | |
904 | break; | |
905 | case -ETIMEDOUT: | |
906 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
907 | __FUNCTION__, cdev->dev.bus_id); | |
908 | //FIXME - dasd uses own timeout interface... | |
909 | break; | |
910 | default: | |
911 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
912 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); | |
913 | } | |
914 | return; | |
915 | } | |
916 | ||
917 | now = get_clock(); | |
918 | ||
919 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
920 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), | |
921 | (unsigned int) intparm); | |
922 | ||
923 | /* first of all check for state change pending interrupt */ | |
924 | mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; | |
925 | if ((irb->scsw.dstat & mask) == mask) { | |
926 | device = dasd_device_from_cdev(cdev); | |
927 | if (!IS_ERR(device)) { | |
928 | dasd_handle_state_change_pending(device); | |
929 | dasd_put_device(device); | |
930 | } | |
931 | return; | |
932 | } | |
933 | ||
934 | cqr = (struct dasd_ccw_req *) intparm; | |
935 | ||
936 | /* check for unsolicited interrupts */ | |
937 | if (cqr == NULL) { | |
938 | MESSAGE(KERN_DEBUG, | |
939 | "unsolicited interrupt received: bus_id %s", | |
940 | cdev->dev.bus_id); | |
941 | return; | |
942 | } | |
943 | ||
944 | device = (struct dasd_device *) cqr->device; | |
945 | if (device == NULL || | |
946 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
947 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
948 | cdev->dev.bus_id); | |
949 | return; | |
950 | } | |
951 | ||
952 | /* Check for clear pending */ | |
953 | if (cqr->status == DASD_CQR_CLEAR && | |
954 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { | |
955 | cqr->status = DASD_CQR_QUEUED; | |
956 | dasd_clear_timer(device); | |
957 | dasd_schedule_bh(device); | |
958 | return; | |
959 | } | |
960 | ||
961 | /* check status - the request might have been killed by dyn detach */ | |
962 | if (cqr->status != DASD_CQR_IN_IO) { | |
963 | MESSAGE(KERN_DEBUG, | |
964 | "invalid status: bus_id %s, status %02x", | |
965 | cdev->dev.bus_id, cqr->status); | |
966 | return; | |
967 | } | |
968 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
969 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); | |
970 | ||
971 | /* Find out the appropriate era_action. */ | |
972 | if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) | |
973 | era = dasd_era_fatal; | |
974 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
975 | irb->scsw.cstat == 0 && | |
976 | !irb->esw.esw0.erw.cons) | |
977 | era = dasd_era_none; | |
978 | else if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) | |
979 | era = dasd_era_fatal; /* don't recover this request */ | |
980 | else if (irb->esw.esw0.erw.cons) | |
981 | era = device->discipline->examine_error(cqr, irb); | |
982 | else | |
983 | era = dasd_era_recover; | |
984 | ||
985 | DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); | |
986 | expires = 0; | |
987 | if (era == dasd_era_none) { | |
988 | cqr->status = DASD_CQR_DONE; | |
989 | cqr->stopclk = now; | |
990 | /* Start first request on queue if possible -> fast_io. */ | |
991 | if (cqr->list.next != &device->ccw_queue) { | |
992 | next = list_entry(cqr->list.next, | |
993 | struct dasd_ccw_req, list); | |
994 | if ((next->status == DASD_CQR_QUEUED) && | |
995 | (!device->stopped)) { | |
996 | if (device->discipline->start_IO(next) == 0) | |
997 | expires = next->expires; | |
998 | else | |
999 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1000 | "Interrupt fastpath " | |
1001 | "failed!"); | |
1002 | } | |
1003 | } | |
1004 | } else { /* error */ | |
1005 | memcpy(&cqr->irb, irb, sizeof (struct irb)); | |
1006 | #ifdef ERP_DEBUG | |
1007 | /* dump sense data */ | |
1008 | dasd_log_sense(cqr, irb); | |
1009 | #endif | |
1010 | switch (era) { | |
1011 | case dasd_era_fatal: | |
1012 | cqr->status = DASD_CQR_FAILED; | |
1013 | cqr->stopclk = now; | |
1014 | break; | |
1015 | case dasd_era_recover: | |
1016 | cqr->status = DASD_CQR_ERROR; | |
1017 | break; | |
1018 | default: | |
1019 | BUG(); | |
1020 | } | |
1021 | } | |
1022 | if (expires != 0) | |
1023 | dasd_set_timer(device, expires); | |
1024 | else | |
1025 | dasd_clear_timer(device); | |
1026 | dasd_schedule_bh(device); | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * posts the buffer_cache about a finalized request | |
1031 | */ | |
1032 | static inline void | |
1033 | dasd_end_request(struct request *req, int uptodate) | |
1034 | { | |
1035 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) | |
1036 | BUG(); | |
1037 | add_disk_randomness(req->rq_disk); | |
1038 | end_that_request_last(req); | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * Process finished error recovery ccw. | |
1043 | */ | |
1044 | static inline void | |
1045 | __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr) | |
1046 | { | |
1047 | dasd_erp_fn_t erp_fn; | |
1048 | ||
1049 | if (cqr->status == DASD_CQR_DONE) | |
1050 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1051 | else | |
1052 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1053 | erp_fn = device->discipline->erp_postaction(cqr); | |
1054 | erp_fn(cqr); | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Process ccw request queue. | |
1059 | */ | |
1060 | static inline void | |
1061 | __dasd_process_ccw_queue(struct dasd_device * device, | |
1062 | struct list_head *final_queue) | |
1063 | { | |
1064 | struct list_head *l, *n; | |
1065 | struct dasd_ccw_req *cqr; | |
1066 | dasd_erp_fn_t erp_fn; | |
1067 | ||
1068 | restart: | |
1069 | /* Process request with final status. */ | |
1070 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1071 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1072 | /* Stop list processing at the first non-final request. */ | |
1073 | if (cqr->status != DASD_CQR_DONE && | |
1074 | cqr->status != DASD_CQR_FAILED && | |
1075 | cqr->status != DASD_CQR_ERROR) | |
1076 | break; | |
1077 | /* Process requests with DASD_CQR_ERROR */ | |
1078 | if (cqr->status == DASD_CQR_ERROR) { | |
1079 | if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) { | |
1080 | cqr->status = DASD_CQR_FAILED; | |
1081 | cqr->stopclk = get_clock(); | |
1082 | } else { | |
1083 | if (cqr->irb.esw.esw0.erw.cons) { | |
1084 | erp_fn = device->discipline-> | |
1085 | erp_action(cqr); | |
1086 | erp_fn(cqr); | |
1087 | } else | |
1088 | dasd_default_erp_action(cqr); | |
1089 | } | |
1090 | goto restart; | |
1091 | } | |
1092 | /* Process finished ERP request. */ | |
1093 | if (cqr->refers) { | |
1094 | __dasd_process_erp(device, cqr); | |
1095 | goto restart; | |
1096 | } | |
1097 | ||
1098 | /* Rechain finished requests to final queue */ | |
1099 | cqr->endclk = get_clock(); | |
1100 | list_move_tail(&cqr->list, final_queue); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | static void | |
1105 | dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data) | |
1106 | { | |
1107 | struct request *req; | |
1108 | struct dasd_device *device; | |
1109 | int status; | |
1110 | ||
1111 | req = (struct request *) data; | |
1112 | device = cqr->device; | |
1113 | dasd_profile_end(device, cqr, req); | |
1114 | status = cqr->device->discipline->free_cp(cqr,req); | |
1115 | spin_lock_irq(&device->request_queue_lock); | |
1116 | dasd_end_request(req, status); | |
1117 | spin_unlock_irq(&device->request_queue_lock); | |
1118 | } | |
1119 | ||
1120 | ||
1121 | /* | |
1122 | * Fetch requests from the block device queue. | |
1123 | */ | |
1124 | static inline void | |
1125 | __dasd_process_blk_queue(struct dasd_device * device) | |
1126 | { | |
1127 | request_queue_t *queue; | |
1128 | struct request *req; | |
1129 | struct dasd_ccw_req *cqr; | |
c6eb7b77 | 1130 | int nr_queued; |
1da177e4 LT |
1131 | |
1132 | queue = device->request_queue; | |
1133 | /* No queue ? Then there is nothing to do. */ | |
1134 | if (queue == NULL) | |
1135 | return; | |
1136 | ||
1137 | /* | |
1138 | * We requeue request from the block device queue to the ccw | |
1139 | * queue only in two states. In state DASD_STATE_READY the | |
1140 | * partition detection is done and we need to requeue requests | |
1141 | * for that. State DASD_STATE_ONLINE is normal block device | |
1142 | * operation. | |
1143 | */ | |
1144 | if (device->state != DASD_STATE_READY && | |
1145 | device->state != DASD_STATE_ONLINE) | |
1146 | return; | |
1147 | nr_queued = 0; | |
1148 | /* Now we try to fetch requests from the request queue */ | |
1149 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1150 | if (cqr->status == DASD_CQR_QUEUED) | |
1151 | nr_queued++; | |
1152 | while (!blk_queue_plugged(queue) && | |
1153 | elv_next_request(queue) && | |
1154 | nr_queued < DASD_CHANQ_MAX_SIZE) { | |
1155 | req = elv_next_request(queue); | |
f24acd45 | 1156 | |
c6eb7b77 HH |
1157 | if (device->features & DASD_FEATURE_READONLY && |
1158 | rq_data_dir(req) == WRITE) { | |
1da177e4 LT |
1159 | DBF_DEV_EVENT(DBF_ERR, device, |
1160 | "Rejecting write request %p", | |
1161 | req); | |
1162 | blkdev_dequeue_request(req); | |
1163 | dasd_end_request(req, 0); | |
1164 | continue; | |
1165 | } | |
1166 | if (device->stopped & DASD_STOPPED_DC_EIO) { | |
1167 | blkdev_dequeue_request(req); | |
1168 | dasd_end_request(req, 0); | |
1169 | continue; | |
1170 | } | |
1171 | cqr = device->discipline->build_cp(device, req); | |
1172 | if (IS_ERR(cqr)) { | |
1173 | if (PTR_ERR(cqr) == -ENOMEM) | |
1174 | break; /* terminate request queue loop */ | |
1175 | DBF_DEV_EVENT(DBF_ERR, device, | |
1176 | "CCW creation failed (rc=%ld) " | |
1177 | "on request %p", | |
1178 | PTR_ERR(cqr), req); | |
1179 | blkdev_dequeue_request(req); | |
1180 | dasd_end_request(req, 0); | |
1181 | continue; | |
1182 | } | |
1183 | cqr->callback = dasd_end_request_cb; | |
1184 | cqr->callback_data = (void *) req; | |
1185 | cqr->status = DASD_CQR_QUEUED; | |
1186 | blkdev_dequeue_request(req); | |
1187 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1188 | dasd_profile_start(device, cqr, req); | |
1189 | nr_queued++; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * Take a look at the first request on the ccw queue and check | |
1195 | * if it reached its expire time. If so, terminate the IO. | |
1196 | */ | |
1197 | static inline void | |
1198 | __dasd_check_expire(struct dasd_device * device) | |
1199 | { | |
1200 | struct dasd_ccw_req *cqr; | |
1201 | ||
1202 | if (list_empty(&device->ccw_queue)) | |
1203 | return; | |
1204 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1205 | if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) { | |
1206 | if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) { | |
1207 | if (device->discipline->term_IO(cqr) != 0) | |
1208 | /* Hmpf, try again in 1/10 sec */ | |
1209 | dasd_set_timer(device, 10); | |
1210 | } | |
1211 | } | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * Take a look at the first request on the ccw queue and check | |
1216 | * if it needs to be started. | |
1217 | */ | |
1218 | static inline void | |
1219 | __dasd_start_head(struct dasd_device * device) | |
1220 | { | |
1221 | struct dasd_ccw_req *cqr; | |
1222 | int rc; | |
1223 | ||
1224 | if (list_empty(&device->ccw_queue)) | |
1225 | return; | |
1226 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1227 | if ((cqr->status == DASD_CQR_QUEUED) && | |
1228 | (!device->stopped)) { | |
1229 | /* try to start the first I/O that can be started */ | |
1230 | rc = device->discipline->start_IO(cqr); | |
1231 | if (rc == 0) | |
1232 | dasd_set_timer(device, cqr->expires); | |
1233 | else if (rc == -EACCES) { | |
1234 | dasd_schedule_bh(device); | |
1235 | } else | |
1236 | /* Hmpf, try again in 1/2 sec */ | |
1237 | dasd_set_timer(device, 50); | |
1238 | } | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Remove requests from the ccw queue. | |
1243 | */ | |
1244 | static void | |
1245 | dasd_flush_ccw_queue(struct dasd_device * device, int all) | |
1246 | { | |
1247 | struct list_head flush_queue; | |
1248 | struct list_head *l, *n; | |
1249 | struct dasd_ccw_req *cqr; | |
1250 | ||
1251 | INIT_LIST_HEAD(&flush_queue); | |
1252 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1253 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1254 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1255 | /* Flush all request or only block device requests? */ | |
1256 | if (all == 0 && cqr->callback == dasd_end_request_cb) | |
1257 | continue; | |
1258 | if (cqr->status == DASD_CQR_IN_IO) | |
1259 | device->discipline->term_IO(cqr); | |
1260 | if (cqr->status != DASD_CQR_DONE || | |
1261 | cqr->status != DASD_CQR_FAILED) { | |
1262 | cqr->status = DASD_CQR_FAILED; | |
1263 | cqr->stopclk = get_clock(); | |
1264 | } | |
1265 | /* Process finished ERP request. */ | |
1266 | if (cqr->refers) { | |
1267 | __dasd_process_erp(device, cqr); | |
1268 | continue; | |
1269 | } | |
1270 | /* Rechain request on device request queue */ | |
1271 | cqr->endclk = get_clock(); | |
1272 | list_move_tail(&cqr->list, &flush_queue); | |
1273 | } | |
1274 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1275 | /* Now call the callback function of flushed requests */ | |
1276 | list_for_each_safe(l, n, &flush_queue) { | |
1277 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1278 | if (cqr->callback != NULL) | |
1279 | (cqr->callback)(cqr, cqr->callback_data); | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Acquire the device lock and process queues for the device. | |
1285 | */ | |
1286 | static void | |
1287 | dasd_tasklet(struct dasd_device * device) | |
1288 | { | |
1289 | struct list_head final_queue; | |
1290 | struct list_head *l, *n; | |
1291 | struct dasd_ccw_req *cqr; | |
1292 | ||
1293 | atomic_set (&device->tasklet_scheduled, 0); | |
1294 | INIT_LIST_HEAD(&final_queue); | |
1295 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1296 | /* Check expire time of first request on the ccw queue. */ | |
1297 | __dasd_check_expire(device); | |
1298 | /* Finish off requests on ccw queue */ | |
1299 | __dasd_process_ccw_queue(device, &final_queue); | |
1300 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1301 | /* Now call the callback function of requests with final status */ | |
1302 | list_for_each_safe(l, n, &final_queue) { | |
1303 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1304 | list_del(&cqr->list); | |
1305 | if (cqr->callback != NULL) | |
1306 | (cqr->callback)(cqr, cqr->callback_data); | |
1307 | } | |
1308 | spin_lock_irq(&device->request_queue_lock); | |
1309 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1310 | /* Get new request from the block device request queue */ | |
1311 | __dasd_process_blk_queue(device); | |
1312 | /* Now check if the head of the ccw queue needs to be started. */ | |
1313 | __dasd_start_head(device); | |
1314 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1315 | spin_unlock_irq(&device->request_queue_lock); | |
1316 | dasd_put_device(device); | |
1317 | } | |
1318 | ||
1319 | /* | |
1320 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1321 | */ | |
1322 | void | |
1323 | dasd_schedule_bh(struct dasd_device * device) | |
1324 | { | |
1325 | /* Protect against rescheduling. */ | |
973bd993 | 1326 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1327 | return; |
1328 | dasd_get_device(device); | |
1329 | tasklet_hi_schedule(&device->tasklet); | |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * Queue a request to the head of the ccw_queue. Start the I/O if | |
1334 | * possible. | |
1335 | */ | |
1336 | void | |
1337 | dasd_add_request_head(struct dasd_ccw_req *req) | |
1338 | { | |
1339 | struct dasd_device *device; | |
1340 | unsigned long flags; | |
1341 | ||
1342 | device = req->device; | |
1343 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1344 | req->status = DASD_CQR_QUEUED; | |
1345 | req->device = device; | |
1346 | list_add(&req->list, &device->ccw_queue); | |
1347 | /* let the bh start the request to keep them in order */ | |
1348 | dasd_schedule_bh(device); | |
1349 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Queue a request to the tail of the ccw_queue. Start the I/O if | |
1354 | * possible. | |
1355 | */ | |
1356 | void | |
1357 | dasd_add_request_tail(struct dasd_ccw_req *req) | |
1358 | { | |
1359 | struct dasd_device *device; | |
1360 | unsigned long flags; | |
1361 | ||
1362 | device = req->device; | |
1363 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1364 | req->status = DASD_CQR_QUEUED; | |
1365 | req->device = device; | |
1366 | list_add_tail(&req->list, &device->ccw_queue); | |
1367 | /* let the bh start the request to keep them in order */ | |
1368 | dasd_schedule_bh(device); | |
1369 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | * Wakeup callback. | |
1374 | */ | |
1375 | static void | |
1376 | dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) | |
1377 | { | |
1378 | wake_up((wait_queue_head_t *) data); | |
1379 | } | |
1380 | ||
1381 | static inline int | |
1382 | _wait_for_wakeup(struct dasd_ccw_req *cqr) | |
1383 | { | |
1384 | struct dasd_device *device; | |
1385 | int rc; | |
1386 | ||
1387 | device = cqr->device; | |
1388 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1389 | rc = cqr->status == DASD_CQR_DONE || cqr->status == DASD_CQR_FAILED; | |
1390 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1391 | return rc; | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * Attempts to start a special ccw queue and waits for its completion. | |
1396 | */ | |
1397 | int | |
1398 | dasd_sleep_on(struct dasd_ccw_req * cqr) | |
1399 | { | |
1400 | wait_queue_head_t wait_q; | |
1401 | struct dasd_device *device; | |
1402 | int rc; | |
1403 | ||
1404 | device = cqr->device; | |
1405 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1406 | ||
1407 | init_waitqueue_head (&wait_q); | |
1408 | cqr->callback = dasd_wakeup_cb; | |
1409 | cqr->callback_data = (void *) &wait_q; | |
1410 | cqr->status = DASD_CQR_QUEUED; | |
1411 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1412 | ||
1413 | /* let the bh start the request to keep them in order */ | |
1414 | dasd_schedule_bh(device); | |
1415 | ||
1416 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1417 | ||
1418 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1419 | ||
1420 | /* Request status is either done or failed. */ | |
1421 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1422 | return rc; | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * Attempts to start a special ccw queue and wait interruptible | |
1427 | * for its completion. | |
1428 | */ | |
1429 | int | |
1430 | dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) | |
1431 | { | |
1432 | wait_queue_head_t wait_q; | |
1433 | struct dasd_device *device; | |
1434 | int rc, finished; | |
1435 | ||
1436 | device = cqr->device; | |
1437 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1438 | ||
1439 | init_waitqueue_head (&wait_q); | |
1440 | cqr->callback = dasd_wakeup_cb; | |
1441 | cqr->callback_data = (void *) &wait_q; | |
1442 | cqr->status = DASD_CQR_QUEUED; | |
1443 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1444 | ||
1445 | /* let the bh start the request to keep them in order */ | |
1446 | dasd_schedule_bh(device); | |
1447 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1448 | ||
1449 | finished = 0; | |
1450 | while (!finished) { | |
1451 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); | |
1452 | if (rc != -ERESTARTSYS) { | |
1453 | /* Request status is either done or failed. */ | |
1454 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1455 | break; | |
1456 | } | |
1457 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1458 | if (cqr->status == DASD_CQR_IN_IO && | |
1459 | device->discipline->term_IO(cqr) == 0) { | |
1460 | list_del(&cqr->list); | |
1461 | finished = 1; | |
1462 | } | |
1463 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1464 | } | |
1465 | return rc; | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1470 | * for eckd devices) the currently running request has to be terminated | |
1471 | * and be put back to status queued, before the special request is added | |
1472 | * to the head of the queue. Then the special request is waited on normally. | |
1473 | */ | |
1474 | static inline int | |
1475 | _dasd_term_running_cqr(struct dasd_device *device) | |
1476 | { | |
1477 | struct dasd_ccw_req *cqr; | |
1478 | int rc; | |
1479 | ||
1480 | if (list_empty(&device->ccw_queue)) | |
1481 | return 0; | |
1482 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1483 | rc = device->discipline->term_IO(cqr); | |
1484 | if (rc == 0) { | |
1485 | /* termination successful */ | |
1486 | cqr->status = DASD_CQR_QUEUED; | |
1487 | cqr->startclk = cqr->stopclk = 0; | |
1488 | cqr->starttime = 0; | |
1489 | } | |
1490 | return rc; | |
1491 | } | |
1492 | ||
1493 | int | |
1494 | dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) | |
1495 | { | |
1496 | wait_queue_head_t wait_q; | |
1497 | struct dasd_device *device; | |
1498 | int rc; | |
1499 | ||
1500 | device = cqr->device; | |
1501 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1502 | rc = _dasd_term_running_cqr(device); | |
1503 | if (rc) { | |
1504 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1505 | return rc; | |
1506 | } | |
1507 | ||
1508 | init_waitqueue_head (&wait_q); | |
1509 | cqr->callback = dasd_wakeup_cb; | |
1510 | cqr->callback_data = (void *) &wait_q; | |
1511 | cqr->status = DASD_CQR_QUEUED; | |
1512 | list_add(&cqr->list, &device->ccw_queue); | |
1513 | ||
1514 | /* let the bh start the request to keep them in order */ | |
1515 | dasd_schedule_bh(device); | |
1516 | ||
1517 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1518 | ||
1519 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1520 | ||
1521 | /* Request status is either done or failed. */ | |
1522 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1523 | return rc; | |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * Cancels a request that was started with dasd_sleep_on_req. | |
1528 | * This is useful to timeout requests. The request will be | |
1529 | * terminated if it is currently in i/o. | |
1530 | * Returns 1 if the request has been terminated. | |
1531 | */ | |
1532 | int | |
1533 | dasd_cancel_req(struct dasd_ccw_req *cqr) | |
1534 | { | |
1535 | struct dasd_device *device = cqr->device; | |
1536 | unsigned long flags; | |
1537 | int rc; | |
1538 | ||
1539 | rc = 0; | |
1540 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1541 | switch (cqr->status) { | |
1542 | case DASD_CQR_QUEUED: | |
1543 | /* request was not started - just set to failed */ | |
1544 | cqr->status = DASD_CQR_FAILED; | |
1545 | break; | |
1546 | case DASD_CQR_IN_IO: | |
1547 | /* request in IO - terminate IO and release again */ | |
1548 | if (device->discipline->term_IO(cqr) != 0) | |
1549 | /* what to do if unable to terminate ?????? | |
1550 | e.g. not _IN_IO */ | |
1551 | cqr->status = DASD_CQR_FAILED; | |
1552 | cqr->stopclk = get_clock(); | |
1553 | rc = 1; | |
1554 | break; | |
1555 | case DASD_CQR_DONE: | |
1556 | case DASD_CQR_FAILED: | |
1557 | /* already finished - do nothing */ | |
1558 | break; | |
1559 | default: | |
1560 | DEV_MESSAGE(KERN_ALERT, device, | |
1561 | "invalid status %02x in request", | |
1562 | cqr->status); | |
1563 | BUG(); | |
1564 | ||
1565 | } | |
1566 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1567 | dasd_schedule_bh(device); | |
1568 | return rc; | |
1569 | } | |
1570 | ||
1571 | /* | |
1572 | * SECTION: Block device operations (request queue, partitions, open, release). | |
1573 | */ | |
1574 | ||
1575 | /* | |
1576 | * Dasd request queue function. Called from ll_rw_blk.c | |
1577 | */ | |
1578 | static void | |
1579 | do_dasd_request(request_queue_t * queue) | |
1580 | { | |
1581 | struct dasd_device *device; | |
1582 | ||
1583 | device = (struct dasd_device *) queue->queuedata; | |
1584 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1585 | /* Get new request from the block device request queue */ | |
1586 | __dasd_process_blk_queue(device); | |
1587 | /* Now check if the head of the ccw queue needs to be started. */ | |
1588 | __dasd_start_head(device); | |
1589 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * Allocate and initialize request queue and default I/O scheduler. | |
1594 | */ | |
1595 | static int | |
1596 | dasd_alloc_queue(struct dasd_device * device) | |
1597 | { | |
1598 | int rc; | |
1599 | ||
1600 | device->request_queue = blk_init_queue(do_dasd_request, | |
1601 | &device->request_queue_lock); | |
1602 | if (device->request_queue == NULL) | |
1603 | return -ENOMEM; | |
1604 | ||
1605 | device->request_queue->queuedata = device; | |
1606 | ||
1607 | elevator_exit(device->request_queue->elevator); | |
1608 | rc = elevator_init(device->request_queue, "deadline"); | |
1609 | if (rc) { | |
1610 | blk_cleanup_queue(device->request_queue); | |
1611 | return rc; | |
1612 | } | |
1613 | return 0; | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * Allocate and initialize request queue. | |
1618 | */ | |
1619 | static void | |
1620 | dasd_setup_queue(struct dasd_device * device) | |
1621 | { | |
1622 | int max; | |
1623 | ||
1624 | blk_queue_hardsect_size(device->request_queue, device->bp_block); | |
1625 | max = device->discipline->max_blocks << device->s2b_shift; | |
1626 | blk_queue_max_sectors(device->request_queue, max); | |
1627 | blk_queue_max_phys_segments(device->request_queue, -1L); | |
1628 | blk_queue_max_hw_segments(device->request_queue, -1L); | |
1629 | blk_queue_max_segment_size(device->request_queue, -1L); | |
1630 | blk_queue_segment_boundary(device->request_queue, -1L); | |
6ed93c82 | 1631 | blk_queue_ordered(device->request_queue, 1); |
1da177e4 LT |
1632 | } |
1633 | ||
1634 | /* | |
1635 | * Deactivate and free request queue. | |
1636 | */ | |
1637 | static void | |
1638 | dasd_free_queue(struct dasd_device * device) | |
1639 | { | |
1640 | if (device->request_queue) { | |
1641 | blk_cleanup_queue(device->request_queue); | |
1642 | device->request_queue = NULL; | |
1643 | } | |
1644 | } | |
1645 | ||
1646 | /* | |
1647 | * Flush request on the request queue. | |
1648 | */ | |
1649 | static void | |
1650 | dasd_flush_request_queue(struct dasd_device * device) | |
1651 | { | |
1652 | struct request *req; | |
1653 | ||
1654 | if (!device->request_queue) | |
1655 | return; | |
1656 | ||
1657 | spin_lock_irq(&device->request_queue_lock); | |
1658 | while (!list_empty(&device->request_queue->queue_head)) { | |
1659 | req = elv_next_request(device->request_queue); | |
1660 | if (req == NULL) | |
1661 | break; | |
1662 | dasd_end_request(req, 0); | |
1663 | blkdev_dequeue_request(req); | |
1664 | } | |
1665 | spin_unlock_irq(&device->request_queue_lock); | |
1666 | } | |
1667 | ||
1668 | static int | |
1669 | dasd_open(struct inode *inp, struct file *filp) | |
1670 | { | |
1671 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1672 | struct dasd_device *device = disk->private_data; | |
1673 | int rc; | |
1674 | ||
1675 | atomic_inc(&device->open_count); | |
1676 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1677 | rc = -ENODEV; | |
1678 | goto unlock; | |
1679 | } | |
1680 | ||
1681 | if (!try_module_get(device->discipline->owner)) { | |
1682 | rc = -EINVAL; | |
1683 | goto unlock; | |
1684 | } | |
1685 | ||
1686 | if (dasd_probeonly) { | |
1687 | DEV_MESSAGE(KERN_INFO, device, "%s", | |
1688 | "No access to device due to probeonly mode"); | |
1689 | rc = -EPERM; | |
1690 | goto out; | |
1691 | } | |
1692 | ||
1693 | if (device->state < DASD_STATE_BASIC) { | |
1694 | DBF_DEV_EVENT(DBF_ERR, device, " %s", | |
1695 | " Cannot open unrecognized device"); | |
1696 | rc = -ENODEV; | |
1697 | goto out; | |
1698 | } | |
1699 | ||
1700 | return 0; | |
1701 | ||
1702 | out: | |
1703 | module_put(device->discipline->owner); | |
1704 | unlock: | |
1705 | atomic_dec(&device->open_count); | |
1706 | return rc; | |
1707 | } | |
1708 | ||
1709 | static int | |
1710 | dasd_release(struct inode *inp, struct file *filp) | |
1711 | { | |
1712 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1713 | struct dasd_device *device = disk->private_data; | |
1714 | ||
1715 | atomic_dec(&device->open_count); | |
1716 | module_put(device->discipline->owner); | |
1717 | return 0; | |
1718 | } | |
1719 | ||
1720 | struct block_device_operations | |
1721 | dasd_device_operations = { | |
1722 | .owner = THIS_MODULE, | |
1723 | .open = dasd_open, | |
1724 | .release = dasd_release, | |
1725 | .ioctl = dasd_ioctl, | |
1726 | }; | |
1727 | ||
1728 | ||
1729 | static void | |
1730 | dasd_exit(void) | |
1731 | { | |
1732 | #ifdef CONFIG_PROC_FS | |
1733 | dasd_proc_exit(); | |
1734 | #endif | |
1735 | dasd_ioctl_exit(); | |
6bb0e010 HH |
1736 | if (dasd_page_cache != NULL) { |
1737 | kmem_cache_destroy(dasd_page_cache); | |
1738 | dasd_page_cache = NULL; | |
1739 | } | |
1da177e4 LT |
1740 | dasd_gendisk_exit(); |
1741 | dasd_devmap_exit(); | |
1742 | devfs_remove("dasd"); | |
1743 | if (dasd_debug_area != NULL) { | |
1744 | debug_unregister(dasd_debug_area); | |
1745 | dasd_debug_area = NULL; | |
1746 | } | |
1747 | } | |
1748 | ||
1749 | /* | |
1750 | * SECTION: common functions for ccw_driver use | |
1751 | */ | |
1752 | ||
1753 | /* initial attempt at a probe function. this can be simplified once | |
1754 | * the other detection code is gone */ | |
1755 | int | |
1756 | dasd_generic_probe (struct ccw_device *cdev, | |
1757 | struct dasd_discipline *discipline) | |
1758 | { | |
1759 | int ret; | |
1760 | ||
1761 | ret = dasd_add_sysfs_files(cdev); | |
1762 | if (ret) { | |
1763 | printk(KERN_WARNING | |
1764 | "dasd_generic_probe: could not add sysfs entries " | |
1765 | "for %s\n", cdev->dev.bus_id); | |
59afda78 HH |
1766 | } else { |
1767 | cdev->handler = &dasd_int_handler; | |
1da177e4 LT |
1768 | } |
1769 | ||
1da177e4 LT |
1770 | return ret; |
1771 | } | |
1772 | ||
1773 | /* this will one day be called from a global not_oper handler. | |
1774 | * It is also used by driver_unregister during module unload */ | |
1775 | void | |
1776 | dasd_generic_remove (struct ccw_device *cdev) | |
1777 | { | |
1778 | struct dasd_device *device; | |
1779 | ||
59afda78 HH |
1780 | cdev->handler = NULL; |
1781 | ||
1da177e4 LT |
1782 | dasd_remove_sysfs_files(cdev); |
1783 | device = dasd_device_from_cdev(cdev); | |
1784 | if (IS_ERR(device)) | |
1785 | return; | |
1786 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1787 | /* Already doing offline processing */ | |
1788 | dasd_put_device(device); | |
1789 | return; | |
1790 | } | |
1791 | /* | |
1792 | * This device is removed unconditionally. Set offline | |
1793 | * flag to prevent dasd_open from opening it while it is | |
1794 | * no quite down yet. | |
1795 | */ | |
1796 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1797 | /* dasd_delete_device destroys the device reference. */ | |
1798 | dasd_delete_device(device); | |
1799 | } | |
1800 | ||
1801 | /* activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1802 | * the device is detected for the first time and is supposed to be used | |
1803 | * or the user has started activation through sysfs */ | |
1804 | int | |
1805 | dasd_generic_set_online (struct ccw_device *cdev, | |
1806 | struct dasd_discipline *discipline) | |
1807 | ||
1808 | { | |
1809 | struct dasd_device *device; | |
c6eb7b77 | 1810 | int rc; |
f24acd45 | 1811 | |
1da177e4 LT |
1812 | device = dasd_create_device(cdev); |
1813 | if (IS_ERR(device)) | |
1814 | return PTR_ERR(device); | |
1815 | ||
c6eb7b77 | 1816 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
1817 | if (!dasd_diag_discipline_pointer) { |
1818 | printk (KERN_WARNING | |
1819 | "dasd_generic couldn't online device %s " | |
1820 | "- discipline DIAG not available\n", | |
1821 | cdev->dev.bus_id); | |
1822 | dasd_delete_device(device); | |
1823 | return -ENODEV; | |
1824 | } | |
1825 | discipline = dasd_diag_discipline_pointer; | |
1826 | } | |
1827 | device->discipline = discipline; | |
1828 | ||
1829 | rc = discipline->check_device(device); | |
1830 | if (rc) { | |
1831 | printk (KERN_WARNING | |
1832 | "dasd_generic couldn't online device %s " | |
1833 | "with discipline %s rc=%i\n", | |
1834 | cdev->dev.bus_id, discipline->name, rc); | |
1835 | dasd_delete_device(device); | |
1836 | return rc; | |
1837 | } | |
1838 | ||
1839 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
1840 | if (device->state <= DASD_STATE_KNOWN) { | |
1841 | printk (KERN_WARNING | |
1842 | "dasd_generic discipline not found for %s\n", | |
1843 | cdev->dev.bus_id); | |
1844 | rc = -ENODEV; | |
1845 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1846 | dasd_delete_device(device); | |
1847 | } else | |
1848 | pr_debug("dasd_generic device %s found\n", | |
1849 | cdev->dev.bus_id); | |
1850 | ||
1851 | /* FIXME: we have to wait for the root device but we don't want | |
1852 | * to wait for each single device but for all at once. */ | |
1853 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
1854 | ||
1855 | dasd_put_device(device); | |
1856 | ||
1857 | return rc; | |
1858 | } | |
1859 | ||
1860 | int | |
1861 | dasd_generic_set_offline (struct ccw_device *cdev) | |
1862 | { | |
1863 | struct dasd_device *device; | |
1864 | int max_count; | |
1865 | ||
1866 | device = dasd_device_from_cdev(cdev); | |
1867 | if (IS_ERR(device)) | |
1868 | return PTR_ERR(device); | |
1869 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1870 | /* Already doing offline processing */ | |
1871 | dasd_put_device(device); | |
1872 | return 0; | |
1873 | } | |
1874 | /* | |
1875 | * We must make sure that this device is currently not in use. | |
1876 | * The open_count is increased for every opener, that includes | |
1877 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
1878 | * in the other openers. | |
1879 | */ | |
1880 | max_count = device->bdev ? 0 : -1; | |
1881 | if (atomic_read(&device->open_count) > max_count) { | |
1882 | printk (KERN_WARNING "Can't offline dasd device with open" | |
1883 | " count = %i.\n", | |
1884 | atomic_read(&device->open_count)); | |
1885 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); | |
1886 | dasd_put_device(device); | |
1887 | return -EBUSY; | |
1888 | } | |
1889 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1890 | /* dasd_delete_device destroys the device reference. */ | |
1891 | dasd_delete_device(device); | |
1892 | ||
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | int | |
1897 | dasd_generic_notify(struct ccw_device *cdev, int event) | |
1898 | { | |
1899 | struct dasd_device *device; | |
1900 | struct dasd_ccw_req *cqr; | |
1901 | unsigned long flags; | |
1902 | int ret; | |
1903 | ||
1904 | device = dasd_device_from_cdev(cdev); | |
1905 | if (IS_ERR(device)) | |
1906 | return 0; | |
1907 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1908 | ret = 0; | |
1909 | switch (event) { | |
1910 | case CIO_GONE: | |
1911 | case CIO_NO_PATH: | |
1912 | if (device->state < DASD_STATE_BASIC) | |
1913 | break; | |
1914 | /* Device is active. We want to keep it. */ | |
1915 | if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) { | |
1916 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1917 | if (cqr->status == DASD_CQR_IN_IO) | |
1918 | cqr->status = DASD_CQR_FAILED; | |
1919 | device->stopped |= DASD_STOPPED_DC_EIO; | |
1920 | dasd_schedule_bh(device); | |
1921 | } else { | |
1922 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1923 | if (cqr->status == DASD_CQR_IN_IO) { | |
1924 | cqr->status = DASD_CQR_QUEUED; | |
1925 | cqr->retries++; | |
1926 | } | |
1927 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
1928 | dasd_set_timer(device, 0); | |
1929 | } | |
1930 | ret = 1; | |
1931 | break; | |
1932 | case CIO_OPER: | |
1933 | /* FIXME: add a sanity check. */ | |
1934 | device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO); | |
1935 | dasd_schedule_bh(device); | |
1936 | ret = 1; | |
1937 | break; | |
1938 | } | |
1939 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1940 | dasd_put_device(device); | |
1941 | return ret; | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * Automatically online either all dasd devices (dasd_autodetect) or | |
1946 | * all devices specified with dasd= parameters. | |
1947 | */ | |
c551288e CH |
1948 | static int |
1949 | __dasd_auto_online(struct device *dev, void *data) | |
1950 | { | |
1951 | struct ccw_device *cdev; | |
1952 | ||
1953 | cdev = to_ccwdev(dev); | |
1954 | if (dasd_autodetect || dasd_busid_known(cdev->dev.bus_id) == 0) | |
1955 | ccw_device_set_online(cdev); | |
1956 | return 0; | |
1957 | } | |
1958 | ||
1da177e4 LT |
1959 | void |
1960 | dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver) | |
1961 | { | |
1962 | struct device_driver *drv; | |
1da177e4 LT |
1963 | |
1964 | drv = get_driver(&dasd_discipline_driver->driver); | |
c551288e | 1965 | driver_for_each_device(drv, NULL, NULL, __dasd_auto_online); |
1da177e4 LT |
1966 | put_driver(drv); |
1967 | } | |
1968 | ||
1969 | static int __init | |
1970 | dasd_init(void) | |
1971 | { | |
1972 | int rc; | |
1973 | ||
1974 | init_waitqueue_head(&dasd_init_waitq); | |
1975 | ||
1976 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
66a464db | 1977 | dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long)); |
1da177e4 LT |
1978 | if (dasd_debug_area == NULL) { |
1979 | rc = -ENOMEM; | |
1980 | goto failed; | |
1981 | } | |
1982 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
1983 | debug_set_level(dasd_debug_area, DBF_EMERG); | |
1984 | ||
1985 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
1986 | ||
1987 | dasd_diag_discipline_pointer = NULL; | |
1988 | ||
1989 | rc = devfs_mk_dir("dasd"); | |
1990 | if (rc) | |
1991 | goto failed; | |
1992 | rc = dasd_devmap_init(); | |
1993 | if (rc) | |
1994 | goto failed; | |
1995 | rc = dasd_gendisk_init(); | |
1996 | if (rc) | |
1997 | goto failed; | |
1998 | rc = dasd_parse(); | |
1999 | if (rc) | |
2000 | goto failed; | |
2001 | rc = dasd_ioctl_init(); | |
2002 | if (rc) | |
2003 | goto failed; | |
2004 | #ifdef CONFIG_PROC_FS | |
2005 | rc = dasd_proc_init(); | |
2006 | if (rc) | |
2007 | goto failed; | |
2008 | #endif | |
2009 | ||
2010 | return 0; | |
2011 | failed: | |
2012 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2013 | dasd_exit(); | |
2014 | return rc; | |
2015 | } | |
2016 | ||
2017 | module_init(dasd_init); | |
2018 | module_exit(dasd_exit); | |
2019 | ||
2020 | EXPORT_SYMBOL(dasd_debug_area); | |
2021 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2022 | ||
2023 | EXPORT_SYMBOL(dasd_add_request_head); | |
2024 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2025 | EXPORT_SYMBOL(dasd_cancel_req); | |
2026 | EXPORT_SYMBOL(dasd_clear_timer); | |
2027 | EXPORT_SYMBOL(dasd_enable_device); | |
2028 | EXPORT_SYMBOL(dasd_int_handler); | |
2029 | EXPORT_SYMBOL(dasd_kfree_request); | |
2030 | EXPORT_SYMBOL(dasd_kick_device); | |
2031 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
2032 | EXPORT_SYMBOL(dasd_schedule_bh); | |
2033 | EXPORT_SYMBOL(dasd_set_target_state); | |
2034 | EXPORT_SYMBOL(dasd_set_timer); | |
2035 | EXPORT_SYMBOL(dasd_sfree_request); | |
2036 | EXPORT_SYMBOL(dasd_sleep_on); | |
2037 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2038 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2039 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2040 | EXPORT_SYMBOL(dasd_start_IO); | |
2041 | EXPORT_SYMBOL(dasd_term_IO); | |
2042 | ||
2043 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2044 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2045 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2046 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2047 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
2048 | EXPORT_SYMBOL_GPL(dasd_generic_auto_online); | |
2049 | ||
2050 | /* | |
2051 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
2052 | * Emacs will notice this stuff at the end of the file and automatically | |
2053 | * adjust the settings for this buffer only. This must remain at the end | |
2054 | * of the file. | |
2055 | * --------------------------------------------------------------------------- | |
2056 | * Local variables: | |
2057 | * c-indent-level: 4 | |
2058 | * c-brace-imaginary-offset: 0 | |
2059 | * c-brace-offset: -4 | |
2060 | * c-argdecl-indent: 4 | |
2061 | * c-label-offset: -4 | |
2062 | * c-continued-statement-offset: 4 | |
2063 | * c-continued-brace-offset: 0 | |
2064 | * indent-tabs-mode: 1 | |
2065 | * tab-width: 8 | |
2066 | * End: | |
2067 | */ |