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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 | * | |
1c01b8a5 | 10 | * $Revision: 1.172 $ |
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> | |
a885c8c4 | 21 | #include <linux/hdreg.h> |
1da177e4 LT |
22 | |
23 | #include <asm/ccwdev.h> | |
24 | #include <asm/ebcdic.h> | |
25 | #include <asm/idals.h> | |
26 | #include <asm/todclk.h> | |
27 | ||
28 | /* This is ugly... */ | |
29 | #define PRINTK_HEADER "dasd:" | |
30 | ||
31 | #include "dasd_int.h" | |
32 | /* | |
33 | * SECTION: Constant definitions to be used within this file | |
34 | */ | |
35 | #define DASD_CHANQ_MAX_SIZE 4 | |
36 | ||
37 | /* | |
38 | * SECTION: exported variables of dasd.c | |
39 | */ | |
40 | debug_info_t *dasd_debug_area; | |
41 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
42 | ||
43 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
44 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
45 | " Copyright 2000 IBM Corporation"); | |
46 | MODULE_SUPPORTED_DEVICE("dasd"); | |
47 | MODULE_PARM(dasd, "1-" __MODULE_STRING(256) "s"); | |
48 | MODULE_LICENSE("GPL"); | |
49 | ||
50 | /* | |
51 | * SECTION: prototypes for static functions of dasd.c | |
52 | */ | |
53 | static int dasd_alloc_queue(struct dasd_device * device); | |
54 | static void dasd_setup_queue(struct dasd_device * device); | |
55 | static void dasd_free_queue(struct dasd_device * device); | |
56 | static void dasd_flush_request_queue(struct dasd_device *); | |
57 | static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); | |
58 | static void dasd_flush_ccw_queue(struct dasd_device *, int); | |
59 | static void dasd_tasklet(struct dasd_device *); | |
60 | static void do_kick_device(void *data); | |
61 | ||
62 | /* | |
63 | * SECTION: Operations on the device structure. | |
64 | */ | |
65 | static wait_queue_head_t dasd_init_waitq; | |
66 | ||
67 | /* | |
68 | * Allocate memory for a new device structure. | |
69 | */ | |
70 | struct dasd_device * | |
71 | dasd_alloc_device(void) | |
72 | { | |
73 | struct dasd_device *device; | |
74 | ||
75 | device = kmalloc(sizeof (struct dasd_device), GFP_ATOMIC); | |
76 | if (device == NULL) | |
77 | return ERR_PTR(-ENOMEM); | |
78 | memset(device, 0, sizeof (struct dasd_device)); | |
79 | /* open_count = 0 means device online but not in use */ | |
80 | atomic_set(&device->open_count, -1); | |
81 | ||
82 | /* Get two pages for normal block device operations. */ | |
83 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
84 | if (device->ccw_mem == NULL) { | |
85 | kfree(device); | |
86 | return ERR_PTR(-ENOMEM); | |
87 | } | |
88 | /* Get one page for error recovery. */ | |
89 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
90 | if (device->erp_mem == NULL) { | |
91 | free_pages((unsigned long) device->ccw_mem, 1); | |
92 | kfree(device); | |
93 | return ERR_PTR(-ENOMEM); | |
94 | } | |
95 | ||
96 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
97 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
98 | spin_lock_init(&device->mem_lock); | |
99 | spin_lock_init(&device->request_queue_lock); | |
100 | atomic_set (&device->tasklet_scheduled, 0); | |
101 | tasklet_init(&device->tasklet, | |
102 | (void (*)(unsigned long)) dasd_tasklet, | |
103 | (unsigned long) device); | |
104 | INIT_LIST_HEAD(&device->ccw_queue); | |
105 | init_timer(&device->timer); | |
106 | INIT_WORK(&device->kick_work, do_kick_device, device); | |
107 | device->state = DASD_STATE_NEW; | |
108 | device->target = DASD_STATE_NEW; | |
109 | ||
110 | return device; | |
111 | } | |
112 | ||
113 | /* | |
114 | * Free memory of a device structure. | |
115 | */ | |
116 | void | |
117 | dasd_free_device(struct dasd_device *device) | |
118 | { | |
17fd682e | 119 | kfree(device->private); |
1da177e4 LT |
120 | free_page((unsigned long) device->erp_mem); |
121 | free_pages((unsigned long) device->ccw_mem, 1); | |
122 | kfree(device); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Make a new device known to the system. | |
127 | */ | |
128 | static inline int | |
129 | dasd_state_new_to_known(struct dasd_device *device) | |
130 | { | |
131 | int rc; | |
132 | ||
133 | /* | |
134 | * As long as the device is not in state DASD_STATE_NEW we want to | |
135 | * keep the reference count > 0. | |
136 | */ | |
137 | dasd_get_device(device); | |
138 | ||
139 | rc = dasd_alloc_queue(device); | |
140 | if (rc) { | |
141 | dasd_put_device(device); | |
142 | return rc; | |
143 | } | |
144 | ||
145 | device->state = DASD_STATE_KNOWN; | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* | |
150 | * Let the system forget about a device. | |
151 | */ | |
152 | static inline void | |
153 | dasd_state_known_to_new(struct dasd_device * device) | |
154 | { | |
155 | /* Forget the discipline information. */ | |
156 | device->discipline = NULL; | |
157 | device->state = DASD_STATE_NEW; | |
158 | ||
159 | dasd_free_queue(device); | |
160 | ||
161 | /* Give up reference we took in dasd_state_new_to_known. */ | |
162 | dasd_put_device(device); | |
163 | } | |
164 | ||
165 | /* | |
166 | * Request the irq line for the device. | |
167 | */ | |
168 | static inline int | |
169 | dasd_state_known_to_basic(struct dasd_device * device) | |
170 | { | |
171 | int rc; | |
172 | ||
173 | /* Allocate and register gendisk structure. */ | |
174 | rc = dasd_gendisk_alloc(device); | |
175 | if (rc) | |
176 | return rc; | |
177 | ||
178 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ | |
66a464db | 179 | device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 2, |
1da177e4 LT |
180 | 8 * sizeof (long)); |
181 | debug_register_view(device->debug_area, &debug_sprintf_view); | |
182 | debug_set_level(device->debug_area, DBF_EMERG); | |
183 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); | |
184 | ||
185 | device->state = DASD_STATE_BASIC; | |
186 | return 0; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Release the irq line for the device. Terminate any running i/o. | |
191 | */ | |
192 | static inline void | |
193 | dasd_state_basic_to_known(struct dasd_device * device) | |
194 | { | |
195 | dasd_gendisk_free(device); | |
196 | dasd_flush_ccw_queue(device, 1); | |
197 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); | |
198 | if (device->debug_area != NULL) { | |
199 | debug_unregister(device->debug_area); | |
200 | device->debug_area = NULL; | |
201 | } | |
202 | device->state = DASD_STATE_KNOWN; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Do the initial analysis. The do_analysis function may return | |
207 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
208 | * until the discipline decides to continue the startup sequence | |
209 | * by calling the function dasd_change_state. The eckd disciplines | |
210 | * uses this to start a ccw that detects the format. The completion | |
211 | * interrupt for this detection ccw uses the kernel event daemon to | |
212 | * trigger the call to dasd_change_state. All this is done in the | |
213 | * discipline code, see dasd_eckd.c. | |
214 | * After the analysis ccw is done (do_analysis returned 0 or error) | |
215 | * the block device is setup. Either a fake disk is added to allow | |
216 | * formatting or a proper device request queue is created. | |
217 | */ | |
218 | static inline int | |
219 | dasd_state_basic_to_ready(struct dasd_device * device) | |
220 | { | |
221 | int rc; | |
222 | ||
223 | rc = 0; | |
224 | if (device->discipline->do_analysis != NULL) | |
225 | rc = device->discipline->do_analysis(device); | |
226 | if (rc) | |
227 | return rc; | |
228 | dasd_setup_queue(device); | |
229 | device->state = DASD_STATE_READY; | |
230 | if (dasd_scan_partitions(device) != 0) | |
231 | device->state = DASD_STATE_BASIC; | |
232 | return 0; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Remove device from block device layer. Destroy dirty buffers. | |
237 | * Forget format information. Check if the target level is basic | |
238 | * and if it is create fake disk for formatting. | |
239 | */ | |
240 | static inline void | |
241 | dasd_state_ready_to_basic(struct dasd_device * device) | |
242 | { | |
243 | dasd_flush_ccw_queue(device, 0); | |
244 | dasd_destroy_partitions(device); | |
245 | dasd_flush_request_queue(device); | |
246 | device->blocks = 0; | |
247 | device->bp_block = 0; | |
248 | device->s2b_shift = 0; | |
249 | device->state = DASD_STATE_BASIC; | |
250 | } | |
251 | ||
252 | /* | |
253 | * Make the device online and schedule the bottom half to start | |
254 | * the requeueing of requests from the linux request queue to the | |
255 | * ccw queue. | |
256 | */ | |
257 | static inline int | |
258 | dasd_state_ready_to_online(struct dasd_device * device) | |
259 | { | |
260 | device->state = DASD_STATE_ONLINE; | |
261 | dasd_schedule_bh(device); | |
262 | return 0; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Stop the requeueing of requests again. | |
267 | */ | |
268 | static inline void | |
269 | dasd_state_online_to_ready(struct dasd_device * device) | |
270 | { | |
271 | device->state = DASD_STATE_READY; | |
272 | } | |
273 | ||
274 | /* | |
275 | * Device startup state changes. | |
276 | */ | |
277 | static inline int | |
278 | dasd_increase_state(struct dasd_device *device) | |
279 | { | |
280 | int rc; | |
281 | ||
282 | rc = 0; | |
283 | if (device->state == DASD_STATE_NEW && | |
284 | device->target >= DASD_STATE_KNOWN) | |
285 | rc = dasd_state_new_to_known(device); | |
286 | ||
287 | if (!rc && | |
288 | device->state == DASD_STATE_KNOWN && | |
289 | device->target >= DASD_STATE_BASIC) | |
290 | rc = dasd_state_known_to_basic(device); | |
291 | ||
292 | if (!rc && | |
293 | device->state == DASD_STATE_BASIC && | |
294 | device->target >= DASD_STATE_READY) | |
295 | rc = dasd_state_basic_to_ready(device); | |
296 | ||
297 | if (!rc && | |
298 | device->state == DASD_STATE_READY && | |
299 | device->target >= DASD_STATE_ONLINE) | |
300 | rc = dasd_state_ready_to_online(device); | |
301 | ||
302 | return rc; | |
303 | } | |
304 | ||
305 | /* | |
306 | * Device shutdown state changes. | |
307 | */ | |
308 | static inline int | |
309 | dasd_decrease_state(struct dasd_device *device) | |
310 | { | |
311 | if (device->state == DASD_STATE_ONLINE && | |
312 | device->target <= DASD_STATE_READY) | |
313 | dasd_state_online_to_ready(device); | |
314 | ||
315 | if (device->state == DASD_STATE_READY && | |
316 | device->target <= DASD_STATE_BASIC) | |
317 | dasd_state_ready_to_basic(device); | |
318 | ||
319 | if (device->state == DASD_STATE_BASIC && | |
320 | device->target <= DASD_STATE_KNOWN) | |
321 | dasd_state_basic_to_known(device); | |
322 | ||
323 | if (device->state == DASD_STATE_KNOWN && | |
324 | device->target <= DASD_STATE_NEW) | |
325 | dasd_state_known_to_new(device); | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | /* | |
331 | * This is the main startup/shutdown routine. | |
332 | */ | |
333 | static void | |
334 | dasd_change_state(struct dasd_device *device) | |
335 | { | |
336 | int rc; | |
337 | ||
338 | if (device->state == device->target) | |
339 | /* Already where we want to go today... */ | |
340 | return; | |
341 | if (device->state < device->target) | |
342 | rc = dasd_increase_state(device); | |
343 | else | |
344 | rc = dasd_decrease_state(device); | |
345 | if (rc && rc != -EAGAIN) | |
346 | device->target = device->state; | |
347 | ||
348 | if (device->state == device->target) | |
349 | wake_up(&dasd_init_waitq); | |
350 | } | |
351 | ||
352 | /* | |
353 | * Kick starter for devices that did not complete the startup/shutdown | |
354 | * procedure or were sleeping because of a pending state. | |
355 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
356 | * event daemon. | |
357 | */ | |
358 | static void | |
359 | do_kick_device(void *data) | |
360 | { | |
361 | struct dasd_device *device; | |
362 | ||
363 | device = (struct dasd_device *) data; | |
364 | dasd_change_state(device); | |
365 | dasd_schedule_bh(device); | |
366 | dasd_put_device(device); | |
367 | } | |
368 | ||
369 | void | |
370 | dasd_kick_device(struct dasd_device *device) | |
371 | { | |
372 | dasd_get_device(device); | |
373 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
374 | schedule_work(&device->kick_work); | |
375 | } | |
376 | ||
377 | /* | |
378 | * Set the target state for a device and starts the state change. | |
379 | */ | |
380 | void | |
381 | dasd_set_target_state(struct dasd_device *device, int target) | |
382 | { | |
383 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
384 | if (dasd_probeonly && target > DASD_STATE_READY) | |
385 | target = DASD_STATE_READY; | |
386 | if (device->target != target) { | |
387 | if (device->state == target) | |
388 | wake_up(&dasd_init_waitq); | |
389 | device->target = target; | |
390 | } | |
391 | if (device->state != device->target) | |
392 | dasd_change_state(device); | |
393 | } | |
394 | ||
395 | /* | |
396 | * Enable devices with device numbers in [from..to]. | |
397 | */ | |
398 | static inline int | |
399 | _wait_for_device(struct dasd_device *device) | |
400 | { | |
401 | return (device->state == device->target); | |
402 | } | |
403 | ||
404 | void | |
405 | dasd_enable_device(struct dasd_device *device) | |
406 | { | |
407 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
408 | if (device->state <= DASD_STATE_KNOWN) | |
409 | /* No discipline for device found. */ | |
410 | dasd_set_target_state(device, DASD_STATE_NEW); | |
411 | /* Now wait for the devices to come up. */ | |
412 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
413 | } | |
414 | ||
415 | /* | |
416 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
417 | */ | |
418 | #ifdef CONFIG_DASD_PROFILE | |
419 | ||
420 | struct dasd_profile_info_t dasd_global_profile; | |
421 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
422 | ||
423 | /* | |
424 | * Increments counter in global and local profiling structures. | |
425 | */ | |
426 | #define dasd_profile_counter(value, counter, device) \ | |
427 | { \ | |
428 | int index; \ | |
429 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
430 | dasd_global_profile.counter[index]++; \ | |
431 | device->profile.counter[index]++; \ | |
432 | } | |
433 | ||
434 | /* | |
435 | * Add profiling information for cqr before execution. | |
436 | */ | |
437 | static inline void | |
438 | dasd_profile_start(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
439 | struct request *req) | |
440 | { | |
441 | struct list_head *l; | |
442 | unsigned int counter; | |
443 | ||
444 | if (dasd_profile_level != DASD_PROFILE_ON) | |
445 | return; | |
446 | ||
447 | /* count the length of the chanq for statistics */ | |
448 | counter = 0; | |
449 | list_for_each(l, &device->ccw_queue) | |
450 | if (++counter >= 31) | |
451 | break; | |
452 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
453 | device->profile.dasd_io_nr_req[counter]++; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Add profiling information for cqr after execution. | |
458 | */ | |
459 | static inline void | |
460 | dasd_profile_end(struct dasd_device *device, struct dasd_ccw_req * cqr, | |
461 | struct request *req) | |
462 | { | |
463 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
464 | long tottimeps, sectors; | |
465 | ||
466 | if (dasd_profile_level != DASD_PROFILE_ON) | |
467 | return; | |
468 | ||
469 | sectors = req->nr_sectors; | |
470 | if (!cqr->buildclk || !cqr->startclk || | |
471 | !cqr->stopclk || !cqr->endclk || | |
472 | !sectors) | |
473 | return; | |
474 | ||
475 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
476 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
477 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
478 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
479 | tottimeps = tottime / sectors; | |
480 | ||
481 | if (!dasd_global_profile.dasd_io_reqs) | |
482 | memset(&dasd_global_profile, 0, | |
483 | sizeof (struct dasd_profile_info_t)); | |
484 | dasd_global_profile.dasd_io_reqs++; | |
485 | dasd_global_profile.dasd_io_sects += sectors; | |
486 | ||
487 | if (!device->profile.dasd_io_reqs) | |
488 | memset(&device->profile, 0, | |
489 | sizeof (struct dasd_profile_info_t)); | |
490 | device->profile.dasd_io_reqs++; | |
491 | device->profile.dasd_io_sects += sectors; | |
492 | ||
493 | dasd_profile_counter(sectors, dasd_io_secs, device); | |
494 | dasd_profile_counter(tottime, dasd_io_times, device); | |
495 | dasd_profile_counter(tottimeps, dasd_io_timps, device); | |
496 | dasd_profile_counter(strtime, dasd_io_time1, device); | |
497 | dasd_profile_counter(irqtime, dasd_io_time2, device); | |
498 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, device); | |
499 | dasd_profile_counter(endtime, dasd_io_time3, device); | |
500 | } | |
501 | #else | |
502 | #define dasd_profile_start(device, cqr, req) do {} while (0) | |
503 | #define dasd_profile_end(device, cqr, req) do {} while (0) | |
504 | #endif /* CONFIG_DASD_PROFILE */ | |
505 | ||
506 | /* | |
507 | * Allocate memory for a channel program with 'cplength' channel | |
508 | * command words and 'datasize' additional space. There are two | |
509 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
510 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
511 | * that gets allocated for each device. | |
512 | */ | |
513 | struct dasd_ccw_req * | |
514 | dasd_kmalloc_request(char *magic, int cplength, int datasize, | |
515 | struct dasd_device * device) | |
516 | { | |
517 | struct dasd_ccw_req *cqr; | |
518 | ||
519 | /* Sanity checks */ | |
520 | if ( magic == NULL || datasize > PAGE_SIZE || | |
521 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
522 | BUG(); | |
523 | ||
524 | cqr = kmalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); | |
525 | if (cqr == NULL) | |
526 | return ERR_PTR(-ENOMEM); | |
527 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
528 | cqr->cpaddr = NULL; | |
529 | if (cplength > 0) { | |
530 | cqr->cpaddr = kmalloc(cplength*sizeof(struct ccw1), | |
531 | GFP_ATOMIC | GFP_DMA); | |
532 | if (cqr->cpaddr == NULL) { | |
533 | kfree(cqr); | |
534 | return ERR_PTR(-ENOMEM); | |
535 | } | |
536 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
537 | } | |
538 | cqr->data = NULL; | |
539 | if (datasize > 0) { | |
540 | cqr->data = kmalloc(datasize, GFP_ATOMIC | GFP_DMA); | |
541 | if (cqr->data == NULL) { | |
17fd682e | 542 | kfree(cqr->cpaddr); |
1da177e4 LT |
543 | kfree(cqr); |
544 | return ERR_PTR(-ENOMEM); | |
545 | } | |
546 | memset(cqr->data, 0, datasize); | |
547 | } | |
548 | strncpy((char *) &cqr->magic, magic, 4); | |
549 | ASCEBC((char *) &cqr->magic, 4); | |
550 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
551 | dasd_get_device(device); | |
552 | return cqr; | |
553 | } | |
554 | ||
555 | struct dasd_ccw_req * | |
556 | dasd_smalloc_request(char *magic, int cplength, int datasize, | |
557 | struct dasd_device * device) | |
558 | { | |
559 | unsigned long flags; | |
560 | struct dasd_ccw_req *cqr; | |
561 | char *data; | |
562 | int size; | |
563 | ||
564 | /* Sanity checks */ | |
565 | if ( magic == NULL || datasize > PAGE_SIZE || | |
566 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE) | |
567 | BUG(); | |
568 | ||
569 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
570 | if (cplength > 0) | |
571 | size += cplength * sizeof(struct ccw1); | |
572 | if (datasize > 0) | |
573 | size += datasize; | |
574 | spin_lock_irqsave(&device->mem_lock, flags); | |
575 | cqr = (struct dasd_ccw_req *) | |
576 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
577 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
578 | if (cqr == NULL) | |
579 | return ERR_PTR(-ENOMEM); | |
580 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
581 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
582 | cqr->cpaddr = NULL; | |
583 | if (cplength > 0) { | |
584 | cqr->cpaddr = (struct ccw1 *) data; | |
585 | data += cplength*sizeof(struct ccw1); | |
586 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
587 | } | |
588 | cqr->data = NULL; | |
589 | if (datasize > 0) { | |
590 | cqr->data = data; | |
591 | memset(cqr->data, 0, datasize); | |
592 | } | |
593 | strncpy((char *) &cqr->magic, magic, 4); | |
594 | ASCEBC((char *) &cqr->magic, 4); | |
595 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
596 | dasd_get_device(device); | |
597 | return cqr; | |
598 | } | |
599 | ||
600 | /* | |
601 | * Free memory of a channel program. This function needs to free all the | |
602 | * idal lists that might have been created by dasd_set_cda and the | |
603 | * struct dasd_ccw_req itself. | |
604 | */ | |
605 | void | |
606 | dasd_kfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
607 | { | |
347a8dc3 | 608 | #ifdef CONFIG_64BIT |
1da177e4 LT |
609 | struct ccw1 *ccw; |
610 | ||
611 | /* Clear any idals used for the request. */ | |
612 | ccw = cqr->cpaddr; | |
613 | do { | |
614 | clear_normalized_cda(ccw); | |
615 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
616 | #endif | |
17fd682e JJ |
617 | kfree(cqr->cpaddr); |
618 | kfree(cqr->data); | |
1da177e4 LT |
619 | kfree(cqr); |
620 | dasd_put_device(device); | |
621 | } | |
622 | ||
623 | void | |
624 | dasd_sfree_request(struct dasd_ccw_req * cqr, struct dasd_device * device) | |
625 | { | |
626 | unsigned long flags; | |
627 | ||
628 | spin_lock_irqsave(&device->mem_lock, flags); | |
629 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
630 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
631 | dasd_put_device(device); | |
632 | } | |
633 | ||
634 | /* | |
635 | * Check discipline magic in cqr. | |
636 | */ | |
637 | static inline int | |
638 | dasd_check_cqr(struct dasd_ccw_req *cqr) | |
639 | { | |
640 | struct dasd_device *device; | |
641 | ||
642 | if (cqr == NULL) | |
643 | return -EINVAL; | |
644 | device = cqr->device; | |
645 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { | |
646 | DEV_MESSAGE(KERN_WARNING, device, | |
647 | " dasd_ccw_req 0x%08x magic doesn't match" | |
648 | " discipline 0x%08x", | |
649 | cqr->magic, | |
650 | *(unsigned int *) device->discipline->name); | |
651 | return -EINVAL; | |
652 | } | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* | |
657 | * Terminate the current i/o and set the request to clear_pending. | |
658 | * Timer keeps device runnig. | |
659 | * ccw_device_clear can fail if the i/o subsystem | |
660 | * is in a bad mood. | |
661 | */ | |
662 | int | |
663 | dasd_term_IO(struct dasd_ccw_req * cqr) | |
664 | { | |
665 | struct dasd_device *device; | |
666 | int retries, rc; | |
667 | ||
668 | /* Check the cqr */ | |
669 | rc = dasd_check_cqr(cqr); | |
670 | if (rc) | |
671 | return rc; | |
672 | retries = 0; | |
673 | device = (struct dasd_device *) cqr->device; | |
674 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { | |
675 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
676 | switch (rc) { | |
677 | case 0: /* termination successful */ | |
678 | if (cqr->retries > 0) { | |
679 | cqr->retries--; | |
680 | cqr->status = DASD_CQR_CLEAR; | |
681 | } else | |
682 | cqr->status = DASD_CQR_FAILED; | |
683 | cqr->stopclk = get_clock(); | |
684 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
685 | "terminate cqr %p successful", | |
686 | cqr); | |
687 | break; | |
688 | case -ENODEV: | |
689 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
690 | "device gone, retry"); | |
691 | break; | |
692 | case -EIO: | |
693 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
694 | "I/O error, retry"); | |
695 | break; | |
696 | case -EINVAL: | |
697 | case -EBUSY: | |
698 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
699 | "device busy, retry later"); | |
700 | break; | |
701 | default: | |
702 | DEV_MESSAGE(KERN_ERR, device, | |
703 | "line %d unknown RC=%d, please " | |
704 | "report to linux390@de.ibm.com", | |
705 | __LINE__, rc); | |
706 | BUG(); | |
707 | break; | |
708 | } | |
709 | retries++; | |
710 | } | |
711 | dasd_schedule_bh(device); | |
712 | return rc; | |
713 | } | |
714 | ||
715 | /* | |
716 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
717 | * In that case set up a timer to start the request later. | |
718 | */ | |
719 | int | |
720 | dasd_start_IO(struct dasd_ccw_req * cqr) | |
721 | { | |
722 | struct dasd_device *device; | |
723 | int rc; | |
724 | ||
725 | /* Check the cqr */ | |
726 | rc = dasd_check_cqr(cqr); | |
727 | if (rc) | |
728 | return rc; | |
729 | device = (struct dasd_device *) cqr->device; | |
730 | if (cqr->retries < 0) { | |
731 | DEV_MESSAGE(KERN_DEBUG, device, | |
732 | "start_IO: request %p (%02x/%i) - no retry left.", | |
733 | cqr, cqr->status, cqr->retries); | |
734 | cqr->status = DASD_CQR_FAILED; | |
735 | return -EIO; | |
736 | } | |
737 | cqr->startclk = get_clock(); | |
738 | cqr->starttime = jiffies; | |
739 | cqr->retries--; | |
740 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
741 | cqr->lpm, 0); | |
742 | switch (rc) { | |
743 | case 0: | |
744 | cqr->status = DASD_CQR_IN_IO; | |
745 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
746 | "start_IO: request %p started successful", | |
747 | cqr); | |
748 | break; | |
749 | case -EBUSY: | |
750 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
751 | "start_IO: device busy, retry later"); | |
752 | break; | |
753 | case -ETIMEDOUT: | |
754 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
755 | "start_IO: request timeout, retry later"); | |
756 | break; | |
757 | case -EACCES: | |
758 | /* -EACCES indicates that the request used only a | |
759 | * subset of the available pathes and all these | |
760 | * pathes are gone. | |
761 | * Do a retry with all available pathes. | |
762 | */ | |
763 | cqr->lpm = LPM_ANYPATH; | |
764 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
765 | "start_IO: selected pathes gone," | |
766 | " retry on all pathes"); | |
767 | break; | |
768 | case -ENODEV: | |
769 | case -EIO: | |
770 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
771 | "start_IO: device gone, retry"); | |
772 | break; | |
773 | default: | |
774 | DEV_MESSAGE(KERN_ERR, device, | |
775 | "line %d unknown RC=%d, please report" | |
776 | " to linux390@de.ibm.com", __LINE__, rc); | |
777 | BUG(); | |
778 | break; | |
779 | } | |
780 | return rc; | |
781 | } | |
782 | ||
783 | /* | |
784 | * Timeout function for dasd devices. This is used for different purposes | |
785 | * 1) missing interrupt handler for normal operation | |
786 | * 2) delayed start of request where start_IO failed with -EBUSY | |
787 | * 3) timeout for missing state change interrupts | |
788 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
789 | * DASD_CQR_QUEUED for 2) and 3). | |
790 | */ | |
791 | static void | |
792 | dasd_timeout_device(unsigned long ptr) | |
793 | { | |
794 | unsigned long flags; | |
795 | struct dasd_device *device; | |
796 | ||
797 | device = (struct dasd_device *) ptr; | |
798 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
799 | /* re-activate request queue */ | |
800 | device->stopped &= ~DASD_STOPPED_PENDING; | |
801 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
802 | dasd_schedule_bh(device); | |
803 | } | |
804 | ||
805 | /* | |
806 | * Setup timeout for a device in jiffies. | |
807 | */ | |
808 | void | |
809 | dasd_set_timer(struct dasd_device *device, int expires) | |
810 | { | |
811 | if (expires == 0) { | |
812 | if (timer_pending(&device->timer)) | |
813 | del_timer(&device->timer); | |
814 | return; | |
815 | } | |
816 | if (timer_pending(&device->timer)) { | |
817 | if (mod_timer(&device->timer, jiffies + expires)) | |
818 | return; | |
819 | } | |
820 | device->timer.function = dasd_timeout_device; | |
821 | device->timer.data = (unsigned long) device; | |
822 | device->timer.expires = jiffies + expires; | |
823 | add_timer(&device->timer); | |
824 | } | |
825 | ||
826 | /* | |
827 | * Clear timeout for a device. | |
828 | */ | |
829 | void | |
830 | dasd_clear_timer(struct dasd_device *device) | |
831 | { | |
832 | if (timer_pending(&device->timer)) | |
833 | del_timer(&device->timer); | |
834 | } | |
835 | ||
836 | static void | |
837 | dasd_handle_killed_request(struct ccw_device *cdev, unsigned long intparm) | |
838 | { | |
839 | struct dasd_ccw_req *cqr; | |
840 | struct dasd_device *device; | |
841 | ||
842 | cqr = (struct dasd_ccw_req *) intparm; | |
843 | if (cqr->status != DASD_CQR_IN_IO) { | |
844 | MESSAGE(KERN_DEBUG, | |
845 | "invalid status in handle_killed_request: " | |
846 | "bus_id %s, status %02x", | |
847 | cdev->dev.bus_id, cqr->status); | |
848 | return; | |
849 | } | |
850 | ||
851 | device = (struct dasd_device *) cqr->device; | |
852 | if (device == NULL || | |
853 | device != dasd_device_from_cdev(cdev) || | |
854 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
855 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
856 | cdev->dev.bus_id); | |
857 | return; | |
858 | } | |
859 | ||
860 | /* Schedule request to be retried. */ | |
861 | cqr->status = DASD_CQR_QUEUED; | |
862 | ||
863 | dasd_clear_timer(device); | |
864 | dasd_schedule_bh(device); | |
865 | dasd_put_device(device); | |
866 | } | |
867 | ||
868 | static void | |
869 | dasd_handle_state_change_pending(struct dasd_device *device) | |
870 | { | |
871 | struct dasd_ccw_req *cqr; | |
872 | struct list_head *l, *n; | |
873 | ||
874 | device->stopped &= ~DASD_STOPPED_PENDING; | |
875 | ||
876 | /* restart all 'running' IO on queue */ | |
877 | list_for_each_safe(l, n, &device->ccw_queue) { | |
878 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
879 | if (cqr->status == DASD_CQR_IN_IO) { | |
880 | cqr->status = DASD_CQR_QUEUED; | |
881 | } | |
882 | } | |
883 | dasd_clear_timer(device); | |
884 | dasd_schedule_bh(device); | |
885 | } | |
886 | ||
887 | /* | |
888 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
889 | */ | |
890 | void | |
891 | dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
892 | struct irb *irb) | |
893 | { | |
894 | struct dasd_ccw_req *cqr, *next; | |
895 | struct dasd_device *device; | |
896 | unsigned long long now; | |
897 | int expires; | |
898 | dasd_era_t era; | |
899 | char mask; | |
900 | ||
901 | if (IS_ERR(irb)) { | |
902 | switch (PTR_ERR(irb)) { | |
903 | case -EIO: | |
904 | dasd_handle_killed_request(cdev, intparm); | |
905 | break; | |
906 | case -ETIMEDOUT: | |
907 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
908 | __FUNCTION__, cdev->dev.bus_id); | |
909 | //FIXME - dasd uses own timeout interface... | |
910 | break; | |
911 | default: | |
912 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
913 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); | |
914 | } | |
915 | return; | |
916 | } | |
917 | ||
918 | now = get_clock(); | |
919 | ||
920 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
921 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), | |
922 | (unsigned int) intparm); | |
923 | ||
924 | /* first of all check for state change pending interrupt */ | |
925 | mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP; | |
926 | if ((irb->scsw.dstat & mask) == mask) { | |
927 | device = dasd_device_from_cdev(cdev); | |
928 | if (!IS_ERR(device)) { | |
929 | dasd_handle_state_change_pending(device); | |
930 | dasd_put_device(device); | |
931 | } | |
932 | return; | |
933 | } | |
934 | ||
935 | cqr = (struct dasd_ccw_req *) intparm; | |
936 | ||
937 | /* check for unsolicited interrupts */ | |
938 | if (cqr == NULL) { | |
939 | MESSAGE(KERN_DEBUG, | |
940 | "unsolicited interrupt received: bus_id %s", | |
941 | cdev->dev.bus_id); | |
942 | return; | |
943 | } | |
944 | ||
945 | device = (struct dasd_device *) cqr->device; | |
946 | if (device == NULL || | |
947 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
948 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
949 | cdev->dev.bus_id); | |
950 | return; | |
951 | } | |
952 | ||
953 | /* Check for clear pending */ | |
954 | if (cqr->status == DASD_CQR_CLEAR && | |
955 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { | |
956 | cqr->status = DASD_CQR_QUEUED; | |
957 | dasd_clear_timer(device); | |
958 | dasd_schedule_bh(device); | |
959 | return; | |
960 | } | |
961 | ||
962 | /* check status - the request might have been killed by dyn detach */ | |
963 | if (cqr->status != DASD_CQR_IN_IO) { | |
964 | MESSAGE(KERN_DEBUG, | |
965 | "invalid status: bus_id %s, status %02x", | |
966 | cdev->dev.bus_id, cqr->status); | |
967 | return; | |
968 | } | |
969 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
970 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); | |
971 | ||
972 | /* Find out the appropriate era_action. */ | |
973 | if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) | |
974 | era = dasd_era_fatal; | |
975 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
976 | irb->scsw.cstat == 0 && | |
977 | !irb->esw.esw0.erw.cons) | |
978 | era = dasd_era_none; | |
979 | else if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) | |
980 | era = dasd_era_fatal; /* don't recover this request */ | |
981 | else if (irb->esw.esw0.erw.cons) | |
982 | era = device->discipline->examine_error(cqr, irb); | |
983 | else | |
984 | era = dasd_era_recover; | |
985 | ||
986 | DBF_DEV_EVENT(DBF_DEBUG, device, "era_code %d", era); | |
987 | expires = 0; | |
988 | if (era == dasd_era_none) { | |
989 | cqr->status = DASD_CQR_DONE; | |
990 | cqr->stopclk = now; | |
991 | /* Start first request on queue if possible -> fast_io. */ | |
992 | if (cqr->list.next != &device->ccw_queue) { | |
993 | next = list_entry(cqr->list.next, | |
994 | struct dasd_ccw_req, list); | |
995 | if ((next->status == DASD_CQR_QUEUED) && | |
996 | (!device->stopped)) { | |
997 | if (device->discipline->start_IO(next) == 0) | |
998 | expires = next->expires; | |
999 | else | |
1000 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1001 | "Interrupt fastpath " | |
1002 | "failed!"); | |
1003 | } | |
1004 | } | |
1005 | } else { /* error */ | |
1006 | memcpy(&cqr->irb, irb, sizeof (struct irb)); | |
1007 | #ifdef ERP_DEBUG | |
1008 | /* dump sense data */ | |
1009 | dasd_log_sense(cqr, irb); | |
1010 | #endif | |
1011 | switch (era) { | |
1012 | case dasd_era_fatal: | |
1013 | cqr->status = DASD_CQR_FAILED; | |
1014 | cqr->stopclk = now; | |
1015 | break; | |
1016 | case dasd_era_recover: | |
1017 | cqr->status = DASD_CQR_ERROR; | |
1018 | break; | |
1019 | default: | |
1020 | BUG(); | |
1021 | } | |
1022 | } | |
1023 | if (expires != 0) | |
1024 | dasd_set_timer(device, expires); | |
1025 | else | |
1026 | dasd_clear_timer(device); | |
1027 | dasd_schedule_bh(device); | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * posts the buffer_cache about a finalized request | |
1032 | */ | |
1033 | static inline void | |
1034 | dasd_end_request(struct request *req, int uptodate) | |
1035 | { | |
1036 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) | |
1037 | BUG(); | |
1038 | add_disk_randomness(req->rq_disk); | |
8ffdc655 | 1039 | end_that_request_last(req, uptodate); |
1da177e4 LT |
1040 | } |
1041 | ||
1042 | /* | |
1043 | * Process finished error recovery ccw. | |
1044 | */ | |
1045 | static inline void | |
1046 | __dasd_process_erp(struct dasd_device *device, struct dasd_ccw_req *cqr) | |
1047 | { | |
1048 | dasd_erp_fn_t erp_fn; | |
1049 | ||
1050 | if (cqr->status == DASD_CQR_DONE) | |
1051 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1052 | else | |
1053 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1054 | erp_fn = device->discipline->erp_postaction(cqr); | |
1055 | erp_fn(cqr); | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Process ccw request queue. | |
1060 | */ | |
1061 | static inline void | |
1062 | __dasd_process_ccw_queue(struct dasd_device * device, | |
1063 | struct list_head *final_queue) | |
1064 | { | |
1065 | struct list_head *l, *n; | |
1066 | struct dasd_ccw_req *cqr; | |
1067 | dasd_erp_fn_t erp_fn; | |
1068 | ||
1069 | restart: | |
1070 | /* Process request with final status. */ | |
1071 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1072 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1073 | /* Stop list processing at the first non-final request. */ | |
1074 | if (cqr->status != DASD_CQR_DONE && | |
1075 | cqr->status != DASD_CQR_FAILED && | |
1076 | cqr->status != DASD_CQR_ERROR) | |
1077 | break; | |
1078 | /* Process requests with DASD_CQR_ERROR */ | |
1079 | if (cqr->status == DASD_CQR_ERROR) { | |
1080 | if (cqr->irb.scsw.fctl & SCSW_FCTL_HALT_FUNC) { | |
1081 | cqr->status = DASD_CQR_FAILED; | |
1082 | cqr->stopclk = get_clock(); | |
1083 | } else { | |
1084 | if (cqr->irb.esw.esw0.erw.cons) { | |
1085 | erp_fn = device->discipline-> | |
1086 | erp_action(cqr); | |
1087 | erp_fn(cqr); | |
1088 | } else | |
1089 | dasd_default_erp_action(cqr); | |
1090 | } | |
1091 | goto restart; | |
1092 | } | |
1093 | /* Process finished ERP request. */ | |
1094 | if (cqr->refers) { | |
1095 | __dasd_process_erp(device, cqr); | |
1096 | goto restart; | |
1097 | } | |
1098 | ||
1099 | /* Rechain finished requests to final queue */ | |
1100 | cqr->endclk = get_clock(); | |
1101 | list_move_tail(&cqr->list, final_queue); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | static void | |
1106 | dasd_end_request_cb(struct dasd_ccw_req * cqr, void *data) | |
1107 | { | |
1108 | struct request *req; | |
1109 | struct dasd_device *device; | |
1110 | int status; | |
1111 | ||
1112 | req = (struct request *) data; | |
1113 | device = cqr->device; | |
1114 | dasd_profile_end(device, cqr, req); | |
1115 | status = cqr->device->discipline->free_cp(cqr,req); | |
1116 | spin_lock_irq(&device->request_queue_lock); | |
1117 | dasd_end_request(req, status); | |
1118 | spin_unlock_irq(&device->request_queue_lock); | |
1119 | } | |
1120 | ||
1121 | ||
1122 | /* | |
1123 | * Fetch requests from the block device queue. | |
1124 | */ | |
1125 | static inline void | |
1126 | __dasd_process_blk_queue(struct dasd_device * device) | |
1127 | { | |
1128 | request_queue_t *queue; | |
1129 | struct request *req; | |
1130 | struct dasd_ccw_req *cqr; | |
c6eb7b77 | 1131 | int nr_queued; |
1da177e4 LT |
1132 | |
1133 | queue = device->request_queue; | |
1134 | /* No queue ? Then there is nothing to do. */ | |
1135 | if (queue == NULL) | |
1136 | return; | |
1137 | ||
1138 | /* | |
1139 | * We requeue request from the block device queue to the ccw | |
1140 | * queue only in two states. In state DASD_STATE_READY the | |
1141 | * partition detection is done and we need to requeue requests | |
1142 | * for that. State DASD_STATE_ONLINE is normal block device | |
1143 | * operation. | |
1144 | */ | |
1145 | if (device->state != DASD_STATE_READY && | |
1146 | device->state != DASD_STATE_ONLINE) | |
1147 | return; | |
1148 | nr_queued = 0; | |
1149 | /* Now we try to fetch requests from the request queue */ | |
1150 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1151 | if (cqr->status == DASD_CQR_QUEUED) | |
1152 | nr_queued++; | |
1153 | while (!blk_queue_plugged(queue) && | |
1154 | elv_next_request(queue) && | |
1155 | nr_queued < DASD_CHANQ_MAX_SIZE) { | |
1156 | req = elv_next_request(queue); | |
f24acd45 | 1157 | |
c6eb7b77 HH |
1158 | if (device->features & DASD_FEATURE_READONLY && |
1159 | rq_data_dir(req) == WRITE) { | |
1da177e4 LT |
1160 | DBF_DEV_EVENT(DBF_ERR, device, |
1161 | "Rejecting write request %p", | |
1162 | req); | |
1163 | blkdev_dequeue_request(req); | |
1164 | dasd_end_request(req, 0); | |
1165 | continue; | |
1166 | } | |
1167 | if (device->stopped & DASD_STOPPED_DC_EIO) { | |
1168 | blkdev_dequeue_request(req); | |
1169 | dasd_end_request(req, 0); | |
1170 | continue; | |
1171 | } | |
1172 | cqr = device->discipline->build_cp(device, req); | |
1173 | if (IS_ERR(cqr)) { | |
1174 | if (PTR_ERR(cqr) == -ENOMEM) | |
1175 | break; /* terminate request queue loop */ | |
1176 | DBF_DEV_EVENT(DBF_ERR, device, | |
1177 | "CCW creation failed (rc=%ld) " | |
1178 | "on request %p", | |
1179 | PTR_ERR(cqr), req); | |
1180 | blkdev_dequeue_request(req); | |
1181 | dasd_end_request(req, 0); | |
1182 | continue; | |
1183 | } | |
1184 | cqr->callback = dasd_end_request_cb; | |
1185 | cqr->callback_data = (void *) req; | |
1186 | cqr->status = DASD_CQR_QUEUED; | |
1187 | blkdev_dequeue_request(req); | |
1188 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1189 | dasd_profile_start(device, cqr, req); | |
1190 | nr_queued++; | |
1191 | } | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Take a look at the first request on the ccw queue and check | |
1196 | * if it reached its expire time. If so, terminate the IO. | |
1197 | */ | |
1198 | static inline void | |
1199 | __dasd_check_expire(struct dasd_device * device) | |
1200 | { | |
1201 | struct dasd_ccw_req *cqr; | |
1202 | ||
1203 | if (list_empty(&device->ccw_queue)) | |
1204 | return; | |
1205 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1206 | if (cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) { | |
1207 | if (time_after_eq(jiffies, cqr->expires + cqr->starttime)) { | |
1208 | if (device->discipline->term_IO(cqr) != 0) | |
1209 | /* Hmpf, try again in 1/10 sec */ | |
1210 | dasd_set_timer(device, 10); | |
1211 | } | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Take a look at the first request on the ccw queue and check | |
1217 | * if it needs to be started. | |
1218 | */ | |
1219 | static inline void | |
1220 | __dasd_start_head(struct dasd_device * device) | |
1221 | { | |
1222 | struct dasd_ccw_req *cqr; | |
1223 | int rc; | |
1224 | ||
1225 | if (list_empty(&device->ccw_queue)) | |
1226 | return; | |
1227 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1c01b8a5 HH |
1228 | /* check FAILFAST */ |
1229 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
1230 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags)) { | |
1231 | cqr->status = DASD_CQR_FAILED; | |
1232 | dasd_schedule_bh(device); | |
1233 | } | |
1da177e4 LT |
1234 | if ((cqr->status == DASD_CQR_QUEUED) && |
1235 | (!device->stopped)) { | |
1236 | /* try to start the first I/O that can be started */ | |
1237 | rc = device->discipline->start_IO(cqr); | |
1238 | if (rc == 0) | |
1239 | dasd_set_timer(device, cqr->expires); | |
1240 | else if (rc == -EACCES) { | |
1241 | dasd_schedule_bh(device); | |
1242 | } else | |
1243 | /* Hmpf, try again in 1/2 sec */ | |
1244 | dasd_set_timer(device, 50); | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * Remove requests from the ccw queue. | |
1250 | */ | |
1251 | static void | |
1252 | dasd_flush_ccw_queue(struct dasd_device * device, int all) | |
1253 | { | |
1254 | struct list_head flush_queue; | |
1255 | struct list_head *l, *n; | |
1256 | struct dasd_ccw_req *cqr; | |
1257 | ||
1258 | INIT_LIST_HEAD(&flush_queue); | |
1259 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1260 | list_for_each_safe(l, n, &device->ccw_queue) { | |
1261 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1262 | /* Flush all request or only block device requests? */ | |
1263 | if (all == 0 && cqr->callback == dasd_end_request_cb) | |
1264 | continue; | |
1265 | if (cqr->status == DASD_CQR_IN_IO) | |
1266 | device->discipline->term_IO(cqr); | |
1267 | if (cqr->status != DASD_CQR_DONE || | |
1268 | cqr->status != DASD_CQR_FAILED) { | |
1269 | cqr->status = DASD_CQR_FAILED; | |
1270 | cqr->stopclk = get_clock(); | |
1271 | } | |
1272 | /* Process finished ERP request. */ | |
1273 | if (cqr->refers) { | |
1274 | __dasd_process_erp(device, cqr); | |
1275 | continue; | |
1276 | } | |
1277 | /* Rechain request on device request queue */ | |
1278 | cqr->endclk = get_clock(); | |
1279 | list_move_tail(&cqr->list, &flush_queue); | |
1280 | } | |
1281 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1282 | /* Now call the callback function of flushed requests */ | |
1283 | list_for_each_safe(l, n, &flush_queue) { | |
1284 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1285 | if (cqr->callback != NULL) | |
1286 | (cqr->callback)(cqr, cqr->callback_data); | |
1287 | } | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Acquire the device lock and process queues for the device. | |
1292 | */ | |
1293 | static void | |
1294 | dasd_tasklet(struct dasd_device * device) | |
1295 | { | |
1296 | struct list_head final_queue; | |
1297 | struct list_head *l, *n; | |
1298 | struct dasd_ccw_req *cqr; | |
1299 | ||
1300 | atomic_set (&device->tasklet_scheduled, 0); | |
1301 | INIT_LIST_HEAD(&final_queue); | |
1302 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1303 | /* Check expire time of first request on the ccw queue. */ | |
1304 | __dasd_check_expire(device); | |
1305 | /* Finish off requests on ccw queue */ | |
1306 | __dasd_process_ccw_queue(device, &final_queue); | |
1307 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1308 | /* Now call the callback function of requests with final status */ | |
1309 | list_for_each_safe(l, n, &final_queue) { | |
1310 | cqr = list_entry(l, struct dasd_ccw_req, list); | |
1311 | list_del(&cqr->list); | |
1312 | if (cqr->callback != NULL) | |
1313 | (cqr->callback)(cqr, cqr->callback_data); | |
1314 | } | |
1315 | spin_lock_irq(&device->request_queue_lock); | |
1316 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1317 | /* Get new request from the block device request queue */ | |
1318 | __dasd_process_blk_queue(device); | |
1319 | /* Now check if the head of the ccw queue needs to be started. */ | |
1320 | __dasd_start_head(device); | |
1321 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1322 | spin_unlock_irq(&device->request_queue_lock); | |
1323 | dasd_put_device(device); | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1328 | */ | |
1329 | void | |
1330 | dasd_schedule_bh(struct dasd_device * device) | |
1331 | { | |
1332 | /* Protect against rescheduling. */ | |
973bd993 | 1333 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1334 | return; |
1335 | dasd_get_device(device); | |
1336 | tasklet_hi_schedule(&device->tasklet); | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Queue a request to the head of the ccw_queue. Start the I/O if | |
1341 | * possible. | |
1342 | */ | |
1343 | void | |
1344 | dasd_add_request_head(struct dasd_ccw_req *req) | |
1345 | { | |
1346 | struct dasd_device *device; | |
1347 | unsigned long flags; | |
1348 | ||
1349 | device = req->device; | |
1350 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1351 | req->status = DASD_CQR_QUEUED; | |
1352 | req->device = device; | |
1353 | list_add(&req->list, &device->ccw_queue); | |
1354 | /* let the bh start the request to keep them in order */ | |
1355 | dasd_schedule_bh(device); | |
1356 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * Queue a request to the tail of the ccw_queue. Start the I/O if | |
1361 | * possible. | |
1362 | */ | |
1363 | void | |
1364 | dasd_add_request_tail(struct dasd_ccw_req *req) | |
1365 | { | |
1366 | struct dasd_device *device; | |
1367 | unsigned long flags; | |
1368 | ||
1369 | device = req->device; | |
1370 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1371 | req->status = DASD_CQR_QUEUED; | |
1372 | req->device = device; | |
1373 | list_add_tail(&req->list, &device->ccw_queue); | |
1374 | /* let the bh start the request to keep them in order */ | |
1375 | dasd_schedule_bh(device); | |
1376 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1377 | } | |
1378 | ||
1379 | /* | |
1380 | * Wakeup callback. | |
1381 | */ | |
1382 | static void | |
1383 | dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) | |
1384 | { | |
1385 | wake_up((wait_queue_head_t *) data); | |
1386 | } | |
1387 | ||
1388 | static inline int | |
1389 | _wait_for_wakeup(struct dasd_ccw_req *cqr) | |
1390 | { | |
1391 | struct dasd_device *device; | |
1392 | int rc; | |
1393 | ||
1394 | device = cqr->device; | |
1395 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1396 | rc = cqr->status == DASD_CQR_DONE || cqr->status == DASD_CQR_FAILED; | |
1397 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1398 | return rc; | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Attempts to start a special ccw queue and waits for its completion. | |
1403 | */ | |
1404 | int | |
1405 | dasd_sleep_on(struct dasd_ccw_req * cqr) | |
1406 | { | |
1407 | wait_queue_head_t wait_q; | |
1408 | struct dasd_device *device; | |
1409 | int rc; | |
1410 | ||
1411 | device = cqr->device; | |
1412 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1413 | ||
1414 | init_waitqueue_head (&wait_q); | |
1415 | cqr->callback = dasd_wakeup_cb; | |
1416 | cqr->callback_data = (void *) &wait_q; | |
1417 | cqr->status = DASD_CQR_QUEUED; | |
1418 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1419 | ||
1420 | /* let the bh start the request to keep them in order */ | |
1421 | dasd_schedule_bh(device); | |
1422 | ||
1423 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1424 | ||
1425 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1426 | ||
1427 | /* Request status is either done or failed. */ | |
1428 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1429 | return rc; | |
1430 | } | |
1431 | ||
1432 | /* | |
1433 | * Attempts to start a special ccw queue and wait interruptible | |
1434 | * for its completion. | |
1435 | */ | |
1436 | int | |
1437 | dasd_sleep_on_interruptible(struct dasd_ccw_req * cqr) | |
1438 | { | |
1439 | wait_queue_head_t wait_q; | |
1440 | struct dasd_device *device; | |
1441 | int rc, finished; | |
1442 | ||
1443 | device = cqr->device; | |
1444 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1445 | ||
1446 | init_waitqueue_head (&wait_q); | |
1447 | cqr->callback = dasd_wakeup_cb; | |
1448 | cqr->callback_data = (void *) &wait_q; | |
1449 | cqr->status = DASD_CQR_QUEUED; | |
1450 | list_add_tail(&cqr->list, &device->ccw_queue); | |
1451 | ||
1452 | /* let the bh start the request to keep them in order */ | |
1453 | dasd_schedule_bh(device); | |
1454 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1455 | ||
1456 | finished = 0; | |
1457 | while (!finished) { | |
1458 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); | |
1459 | if (rc != -ERESTARTSYS) { | |
1460 | /* Request status is either done or failed. */ | |
1461 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1462 | break; | |
1463 | } | |
1464 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1465 | if (cqr->status == DASD_CQR_IN_IO && | |
1466 | device->discipline->term_IO(cqr) == 0) { | |
1467 | list_del(&cqr->list); | |
1468 | finished = 1; | |
1469 | } | |
1470 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1471 | } | |
1472 | return rc; | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1477 | * for eckd devices) the currently running request has to be terminated | |
1478 | * and be put back to status queued, before the special request is added | |
1479 | * to the head of the queue. Then the special request is waited on normally. | |
1480 | */ | |
1481 | static inline int | |
1482 | _dasd_term_running_cqr(struct dasd_device *device) | |
1483 | { | |
1484 | struct dasd_ccw_req *cqr; | |
1485 | int rc; | |
1486 | ||
1487 | if (list_empty(&device->ccw_queue)) | |
1488 | return 0; | |
1489 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); | |
1490 | rc = device->discipline->term_IO(cqr); | |
1491 | if (rc == 0) { | |
1492 | /* termination successful */ | |
1493 | cqr->status = DASD_CQR_QUEUED; | |
1494 | cqr->startclk = cqr->stopclk = 0; | |
1495 | cqr->starttime = 0; | |
1496 | } | |
1497 | return rc; | |
1498 | } | |
1499 | ||
1500 | int | |
1501 | dasd_sleep_on_immediatly(struct dasd_ccw_req * cqr) | |
1502 | { | |
1503 | wait_queue_head_t wait_q; | |
1504 | struct dasd_device *device; | |
1505 | int rc; | |
1506 | ||
1507 | device = cqr->device; | |
1508 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1509 | rc = _dasd_term_running_cqr(device); | |
1510 | if (rc) { | |
1511 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1512 | return rc; | |
1513 | } | |
1514 | ||
1515 | init_waitqueue_head (&wait_q); | |
1516 | cqr->callback = dasd_wakeup_cb; | |
1517 | cqr->callback_data = (void *) &wait_q; | |
1518 | cqr->status = DASD_CQR_QUEUED; | |
1519 | list_add(&cqr->list, &device->ccw_queue); | |
1520 | ||
1521 | /* let the bh start the request to keep them in order */ | |
1522 | dasd_schedule_bh(device); | |
1523 | ||
1524 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1525 | ||
1526 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1527 | ||
1528 | /* Request status is either done or failed. */ | |
1529 | rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0; | |
1530 | return rc; | |
1531 | } | |
1532 | ||
1533 | /* | |
1534 | * Cancels a request that was started with dasd_sleep_on_req. | |
1535 | * This is useful to timeout requests. The request will be | |
1536 | * terminated if it is currently in i/o. | |
1537 | * Returns 1 if the request has been terminated. | |
1538 | */ | |
1539 | int | |
1540 | dasd_cancel_req(struct dasd_ccw_req *cqr) | |
1541 | { | |
1542 | struct dasd_device *device = cqr->device; | |
1543 | unsigned long flags; | |
1544 | int rc; | |
1545 | ||
1546 | rc = 0; | |
1547 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1548 | switch (cqr->status) { | |
1549 | case DASD_CQR_QUEUED: | |
1550 | /* request was not started - just set to failed */ | |
1551 | cqr->status = DASD_CQR_FAILED; | |
1552 | break; | |
1553 | case DASD_CQR_IN_IO: | |
1554 | /* request in IO - terminate IO and release again */ | |
1555 | if (device->discipline->term_IO(cqr) != 0) | |
1556 | /* what to do if unable to terminate ?????? | |
1557 | e.g. not _IN_IO */ | |
1558 | cqr->status = DASD_CQR_FAILED; | |
1559 | cqr->stopclk = get_clock(); | |
1560 | rc = 1; | |
1561 | break; | |
1562 | case DASD_CQR_DONE: | |
1563 | case DASD_CQR_FAILED: | |
1564 | /* already finished - do nothing */ | |
1565 | break; | |
1566 | default: | |
1567 | DEV_MESSAGE(KERN_ALERT, device, | |
1568 | "invalid status %02x in request", | |
1569 | cqr->status); | |
1570 | BUG(); | |
1571 | ||
1572 | } | |
1573 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1574 | dasd_schedule_bh(device); | |
1575 | return rc; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * SECTION: Block device operations (request queue, partitions, open, release). | |
1580 | */ | |
1581 | ||
1582 | /* | |
1583 | * Dasd request queue function. Called from ll_rw_blk.c | |
1584 | */ | |
1585 | static void | |
1586 | do_dasd_request(request_queue_t * queue) | |
1587 | { | |
1588 | struct dasd_device *device; | |
1589 | ||
1590 | device = (struct dasd_device *) queue->queuedata; | |
1591 | spin_lock(get_ccwdev_lock(device->cdev)); | |
1592 | /* Get new request from the block device request queue */ | |
1593 | __dasd_process_blk_queue(device); | |
1594 | /* Now check if the head of the ccw queue needs to be started. */ | |
1595 | __dasd_start_head(device); | |
1596 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
1597 | } | |
1598 | ||
1599 | /* | |
1600 | * Allocate and initialize request queue and default I/O scheduler. | |
1601 | */ | |
1602 | static int | |
1603 | dasd_alloc_queue(struct dasd_device * device) | |
1604 | { | |
1605 | int rc; | |
1606 | ||
1607 | device->request_queue = blk_init_queue(do_dasd_request, | |
1608 | &device->request_queue_lock); | |
1609 | if (device->request_queue == NULL) | |
1610 | return -ENOMEM; | |
1611 | ||
1612 | device->request_queue->queuedata = device; | |
1613 | ||
1614 | elevator_exit(device->request_queue->elevator); | |
1615 | rc = elevator_init(device->request_queue, "deadline"); | |
1616 | if (rc) { | |
1617 | blk_cleanup_queue(device->request_queue); | |
1618 | return rc; | |
1619 | } | |
1620 | return 0; | |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * Allocate and initialize request queue. | |
1625 | */ | |
1626 | static void | |
1627 | dasd_setup_queue(struct dasd_device * device) | |
1628 | { | |
1629 | int max; | |
1630 | ||
1631 | blk_queue_hardsect_size(device->request_queue, device->bp_block); | |
1632 | max = device->discipline->max_blocks << device->s2b_shift; | |
1633 | blk_queue_max_sectors(device->request_queue, max); | |
1634 | blk_queue_max_phys_segments(device->request_queue, -1L); | |
1635 | blk_queue_max_hw_segments(device->request_queue, -1L); | |
1636 | blk_queue_max_segment_size(device->request_queue, -1L); | |
1637 | blk_queue_segment_boundary(device->request_queue, -1L); | |
6ed93c82 | 1638 | blk_queue_ordered(device->request_queue, 1); |
1da177e4 LT |
1639 | } |
1640 | ||
1641 | /* | |
1642 | * Deactivate and free request queue. | |
1643 | */ | |
1644 | static void | |
1645 | dasd_free_queue(struct dasd_device * device) | |
1646 | { | |
1647 | if (device->request_queue) { | |
1648 | blk_cleanup_queue(device->request_queue); | |
1649 | device->request_queue = NULL; | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | /* | |
1654 | * Flush request on the request queue. | |
1655 | */ | |
1656 | static void | |
1657 | dasd_flush_request_queue(struct dasd_device * device) | |
1658 | { | |
1659 | struct request *req; | |
1660 | ||
1661 | if (!device->request_queue) | |
1662 | return; | |
1663 | ||
1664 | spin_lock_irq(&device->request_queue_lock); | |
1665 | while (!list_empty(&device->request_queue->queue_head)) { | |
1666 | req = elv_next_request(device->request_queue); | |
1667 | if (req == NULL) | |
1668 | break; | |
1669 | dasd_end_request(req, 0); | |
1670 | blkdev_dequeue_request(req); | |
1671 | } | |
1672 | spin_unlock_irq(&device->request_queue_lock); | |
1673 | } | |
1674 | ||
1675 | static int | |
1676 | dasd_open(struct inode *inp, struct file *filp) | |
1677 | { | |
1678 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1679 | struct dasd_device *device = disk->private_data; | |
1680 | int rc; | |
1681 | ||
1682 | atomic_inc(&device->open_count); | |
1683 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1684 | rc = -ENODEV; | |
1685 | goto unlock; | |
1686 | } | |
1687 | ||
1688 | if (!try_module_get(device->discipline->owner)) { | |
1689 | rc = -EINVAL; | |
1690 | goto unlock; | |
1691 | } | |
1692 | ||
1693 | if (dasd_probeonly) { | |
1694 | DEV_MESSAGE(KERN_INFO, device, "%s", | |
1695 | "No access to device due to probeonly mode"); | |
1696 | rc = -EPERM; | |
1697 | goto out; | |
1698 | } | |
1699 | ||
1700 | if (device->state < DASD_STATE_BASIC) { | |
1701 | DBF_DEV_EVENT(DBF_ERR, device, " %s", | |
1702 | " Cannot open unrecognized device"); | |
1703 | rc = -ENODEV; | |
1704 | goto out; | |
1705 | } | |
1706 | ||
1707 | return 0; | |
1708 | ||
1709 | out: | |
1710 | module_put(device->discipline->owner); | |
1711 | unlock: | |
1712 | atomic_dec(&device->open_count); | |
1713 | return rc; | |
1714 | } | |
1715 | ||
1716 | static int | |
1717 | dasd_release(struct inode *inp, struct file *filp) | |
1718 | { | |
1719 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
1720 | struct dasd_device *device = disk->private_data; | |
1721 | ||
1722 | atomic_dec(&device->open_count); | |
1723 | module_put(device->discipline->owner); | |
1724 | return 0; | |
1725 | } | |
1726 | ||
a885c8c4 CH |
1727 | /* |
1728 | * Return disk geometry. | |
1729 | */ | |
1730 | static int | |
1731 | dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
1732 | { | |
1733 | struct dasd_device *device; | |
1734 | ||
1735 | device = bdev->bd_disk->private_data; | |
1736 | if (!device) | |
1737 | return -ENODEV; | |
1738 | ||
1739 | if (!device->discipline || | |
1740 | !device->discipline->fill_geometry) | |
1741 | return -EINVAL; | |
1742 | ||
1743 | device->discipline->fill_geometry(device, geo); | |
1744 | geo->start = get_start_sect(bdev) >> device->s2b_shift; | |
1745 | return 0; | |
1746 | } | |
1747 | ||
1da177e4 LT |
1748 | struct block_device_operations |
1749 | dasd_device_operations = { | |
1750 | .owner = THIS_MODULE, | |
1751 | .open = dasd_open, | |
1752 | .release = dasd_release, | |
1753 | .ioctl = dasd_ioctl, | |
a885c8c4 | 1754 | .getgeo = dasd_getgeo, |
1da177e4 LT |
1755 | }; |
1756 | ||
1757 | ||
1758 | static void | |
1759 | dasd_exit(void) | |
1760 | { | |
1761 | #ifdef CONFIG_PROC_FS | |
1762 | dasd_proc_exit(); | |
1763 | #endif | |
1764 | dasd_ioctl_exit(); | |
6bb0e010 HH |
1765 | if (dasd_page_cache != NULL) { |
1766 | kmem_cache_destroy(dasd_page_cache); | |
1767 | dasd_page_cache = NULL; | |
1768 | } | |
1da177e4 LT |
1769 | dasd_gendisk_exit(); |
1770 | dasd_devmap_exit(); | |
1771 | devfs_remove("dasd"); | |
1772 | if (dasd_debug_area != NULL) { | |
1773 | debug_unregister(dasd_debug_area); | |
1774 | dasd_debug_area = NULL; | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * SECTION: common functions for ccw_driver use | |
1780 | */ | |
1781 | ||
1c01b8a5 HH |
1782 | /* |
1783 | * Initial attempt at a probe function. this can be simplified once | |
1784 | * the other detection code is gone. | |
1785 | */ | |
1da177e4 LT |
1786 | int |
1787 | dasd_generic_probe (struct ccw_device *cdev, | |
1788 | struct dasd_discipline *discipline) | |
1789 | { | |
1790 | int ret; | |
1791 | ||
1792 | ret = dasd_add_sysfs_files(cdev); | |
1793 | if (ret) { | |
1794 | printk(KERN_WARNING | |
1795 | "dasd_generic_probe: could not add sysfs entries " | |
1796 | "for %s\n", cdev->dev.bus_id); | |
59afda78 HH |
1797 | } else { |
1798 | cdev->handler = &dasd_int_handler; | |
1da177e4 LT |
1799 | } |
1800 | ||
1da177e4 LT |
1801 | return ret; |
1802 | } | |
1803 | ||
1c01b8a5 HH |
1804 | /* |
1805 | * This will one day be called from a global not_oper handler. | |
1806 | * It is also used by driver_unregister during module unload. | |
1807 | */ | |
1da177e4 LT |
1808 | void |
1809 | dasd_generic_remove (struct ccw_device *cdev) | |
1810 | { | |
1811 | struct dasd_device *device; | |
1812 | ||
59afda78 HH |
1813 | cdev->handler = NULL; |
1814 | ||
1da177e4 LT |
1815 | dasd_remove_sysfs_files(cdev); |
1816 | device = dasd_device_from_cdev(cdev); | |
1817 | if (IS_ERR(device)) | |
1818 | return; | |
1819 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1820 | /* Already doing offline processing */ | |
1821 | dasd_put_device(device); | |
1822 | return; | |
1823 | } | |
1824 | /* | |
1825 | * This device is removed unconditionally. Set offline | |
1826 | * flag to prevent dasd_open from opening it while it is | |
1827 | * no quite down yet. | |
1828 | */ | |
1829 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1830 | /* dasd_delete_device destroys the device reference. */ | |
1831 | dasd_delete_device(device); | |
1832 | } | |
1833 | ||
1c01b8a5 HH |
1834 | /* |
1835 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 1836 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
1837 | * or the user has started activation through sysfs. |
1838 | */ | |
1da177e4 LT |
1839 | int |
1840 | dasd_generic_set_online (struct ccw_device *cdev, | |
1841 | struct dasd_discipline *discipline) | |
1842 | ||
1843 | { | |
1844 | struct dasd_device *device; | |
c6eb7b77 | 1845 | int rc; |
f24acd45 | 1846 | |
1da177e4 LT |
1847 | device = dasd_create_device(cdev); |
1848 | if (IS_ERR(device)) | |
1849 | return PTR_ERR(device); | |
1850 | ||
c6eb7b77 | 1851 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
1852 | if (!dasd_diag_discipline_pointer) { |
1853 | printk (KERN_WARNING | |
1854 | "dasd_generic couldn't online device %s " | |
1855 | "- discipline DIAG not available\n", | |
1856 | cdev->dev.bus_id); | |
1857 | dasd_delete_device(device); | |
1858 | return -ENODEV; | |
1859 | } | |
1860 | discipline = dasd_diag_discipline_pointer; | |
1861 | } | |
1862 | device->discipline = discipline; | |
1863 | ||
1864 | rc = discipline->check_device(device); | |
1865 | if (rc) { | |
1866 | printk (KERN_WARNING | |
1867 | "dasd_generic couldn't online device %s " | |
1868 | "with discipline %s rc=%i\n", | |
1869 | cdev->dev.bus_id, discipline->name, rc); | |
1870 | dasd_delete_device(device); | |
1871 | return rc; | |
1872 | } | |
1873 | ||
1874 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
1875 | if (device->state <= DASD_STATE_KNOWN) { | |
1876 | printk (KERN_WARNING | |
1877 | "dasd_generic discipline not found for %s\n", | |
1878 | cdev->dev.bus_id); | |
1879 | rc = -ENODEV; | |
1880 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1881 | dasd_delete_device(device); | |
1882 | } else | |
1883 | pr_debug("dasd_generic device %s found\n", | |
1884 | cdev->dev.bus_id); | |
1885 | ||
1886 | /* FIXME: we have to wait for the root device but we don't want | |
1887 | * to wait for each single device but for all at once. */ | |
1888 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
1889 | ||
1890 | dasd_put_device(device); | |
1891 | ||
1892 | return rc; | |
1893 | } | |
1894 | ||
1895 | int | |
1896 | dasd_generic_set_offline (struct ccw_device *cdev) | |
1897 | { | |
1898 | struct dasd_device *device; | |
1899 | int max_count; | |
1900 | ||
1901 | device = dasd_device_from_cdev(cdev); | |
1902 | if (IS_ERR(device)) | |
1903 | return PTR_ERR(device); | |
1904 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1905 | /* Already doing offline processing */ | |
1906 | dasd_put_device(device); | |
1907 | return 0; | |
1908 | } | |
1909 | /* | |
1910 | * We must make sure that this device is currently not in use. | |
1911 | * The open_count is increased for every opener, that includes | |
1912 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
1913 | * in the other openers. | |
1914 | */ | |
1915 | max_count = device->bdev ? 0 : -1; | |
1916 | if (atomic_read(&device->open_count) > max_count) { | |
1917 | printk (KERN_WARNING "Can't offline dasd device with open" | |
1918 | " count = %i.\n", | |
1919 | atomic_read(&device->open_count)); | |
1920 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); | |
1921 | dasd_put_device(device); | |
1922 | return -EBUSY; | |
1923 | } | |
1924 | dasd_set_target_state(device, DASD_STATE_NEW); | |
1925 | /* dasd_delete_device destroys the device reference. */ | |
1926 | dasd_delete_device(device); | |
1927 | ||
1928 | return 0; | |
1929 | } | |
1930 | ||
1931 | int | |
1932 | dasd_generic_notify(struct ccw_device *cdev, int event) | |
1933 | { | |
1934 | struct dasd_device *device; | |
1935 | struct dasd_ccw_req *cqr; | |
1936 | unsigned long flags; | |
1937 | int ret; | |
1938 | ||
1939 | device = dasd_device_from_cdev(cdev); | |
1940 | if (IS_ERR(device)) | |
1941 | return 0; | |
1942 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1943 | ret = 0; | |
1944 | switch (event) { | |
1945 | case CIO_GONE: | |
1946 | case CIO_NO_PATH: | |
1947 | if (device->state < DASD_STATE_BASIC) | |
1948 | break; | |
1949 | /* Device is active. We want to keep it. */ | |
1950 | if (test_bit(DASD_FLAG_DSC_ERROR, &device->flags)) { | |
1951 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1952 | if (cqr->status == DASD_CQR_IN_IO) | |
1953 | cqr->status = DASD_CQR_FAILED; | |
1954 | device->stopped |= DASD_STOPPED_DC_EIO; | |
1da177e4 LT |
1955 | } else { |
1956 | list_for_each_entry(cqr, &device->ccw_queue, list) | |
1957 | if (cqr->status == DASD_CQR_IN_IO) { | |
1958 | cqr->status = DASD_CQR_QUEUED; | |
1959 | cqr->retries++; | |
1960 | } | |
1961 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
1962 | dasd_set_timer(device, 0); | |
1963 | } | |
1c01b8a5 | 1964 | dasd_schedule_bh(device); |
1da177e4 LT |
1965 | ret = 1; |
1966 | break; | |
1967 | case CIO_OPER: | |
1968 | /* FIXME: add a sanity check. */ | |
1969 | device->stopped &= ~(DASD_STOPPED_DC_WAIT|DASD_STOPPED_DC_EIO); | |
1970 | dasd_schedule_bh(device); | |
1971 | ret = 1; | |
1972 | break; | |
1973 | } | |
1974 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1975 | dasd_put_device(device); | |
1976 | return ret; | |
1977 | } | |
1978 | ||
1979 | /* | |
1980 | * Automatically online either all dasd devices (dasd_autodetect) or | |
1981 | * all devices specified with dasd= parameters. | |
1982 | */ | |
c551288e CH |
1983 | static int |
1984 | __dasd_auto_online(struct device *dev, void *data) | |
1985 | { | |
1986 | struct ccw_device *cdev; | |
1987 | ||
1988 | cdev = to_ccwdev(dev); | |
1989 | if (dasd_autodetect || dasd_busid_known(cdev->dev.bus_id) == 0) | |
1990 | ccw_device_set_online(cdev); | |
1991 | return 0; | |
1992 | } | |
1993 | ||
1da177e4 LT |
1994 | void |
1995 | dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver) | |
1996 | { | |
1997 | struct device_driver *drv; | |
1da177e4 LT |
1998 | |
1999 | drv = get_driver(&dasd_discipline_driver->driver); | |
c551288e | 2000 | driver_for_each_device(drv, NULL, NULL, __dasd_auto_online); |
1da177e4 LT |
2001 | put_driver(drv); |
2002 | } | |
2003 | ||
2004 | static int __init | |
2005 | dasd_init(void) | |
2006 | { | |
2007 | int rc; | |
2008 | ||
2009 | init_waitqueue_head(&dasd_init_waitq); | |
2010 | ||
2011 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
66a464db | 2012 | dasd_debug_area = debug_register("dasd", 1, 2, 8 * sizeof (long)); |
1da177e4 LT |
2013 | if (dasd_debug_area == NULL) { |
2014 | rc = -ENOMEM; | |
2015 | goto failed; | |
2016 | } | |
2017 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
2018 | debug_set_level(dasd_debug_area, DBF_EMERG); | |
2019 | ||
2020 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2021 | ||
2022 | dasd_diag_discipline_pointer = NULL; | |
2023 | ||
2024 | rc = devfs_mk_dir("dasd"); | |
2025 | if (rc) | |
2026 | goto failed; | |
2027 | rc = dasd_devmap_init(); | |
2028 | if (rc) | |
2029 | goto failed; | |
2030 | rc = dasd_gendisk_init(); | |
2031 | if (rc) | |
2032 | goto failed; | |
2033 | rc = dasd_parse(); | |
2034 | if (rc) | |
2035 | goto failed; | |
2036 | rc = dasd_ioctl_init(); | |
2037 | if (rc) | |
2038 | goto failed; | |
2039 | #ifdef CONFIG_PROC_FS | |
2040 | rc = dasd_proc_init(); | |
2041 | if (rc) | |
2042 | goto failed; | |
2043 | #endif | |
2044 | ||
2045 | return 0; | |
2046 | failed: | |
2047 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2048 | dasd_exit(); | |
2049 | return rc; | |
2050 | } | |
2051 | ||
2052 | module_init(dasd_init); | |
2053 | module_exit(dasd_exit); | |
2054 | ||
2055 | EXPORT_SYMBOL(dasd_debug_area); | |
2056 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2057 | ||
2058 | EXPORT_SYMBOL(dasd_add_request_head); | |
2059 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2060 | EXPORT_SYMBOL(dasd_cancel_req); | |
2061 | EXPORT_SYMBOL(dasd_clear_timer); | |
2062 | EXPORT_SYMBOL(dasd_enable_device); | |
2063 | EXPORT_SYMBOL(dasd_int_handler); | |
2064 | EXPORT_SYMBOL(dasd_kfree_request); | |
2065 | EXPORT_SYMBOL(dasd_kick_device); | |
2066 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
2067 | EXPORT_SYMBOL(dasd_schedule_bh); | |
2068 | EXPORT_SYMBOL(dasd_set_target_state); | |
2069 | EXPORT_SYMBOL(dasd_set_timer); | |
2070 | EXPORT_SYMBOL(dasd_sfree_request); | |
2071 | EXPORT_SYMBOL(dasd_sleep_on); | |
2072 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2073 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2074 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2075 | EXPORT_SYMBOL(dasd_start_IO); | |
2076 | EXPORT_SYMBOL(dasd_term_IO); | |
2077 | ||
2078 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2079 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2080 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2081 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2082 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
2083 | EXPORT_SYMBOL_GPL(dasd_generic_auto_online); | |
2084 | ||
2085 | /* | |
2086 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
2087 | * Emacs will notice this stuff at the end of the file and automatically | |
2088 | * adjust the settings for this buffer only. This must remain at the end | |
2089 | * of the file. | |
2090 | * --------------------------------------------------------------------------- | |
2091 | * Local variables: | |
2092 | * c-indent-level: 4 | |
2093 | * c-brace-imaginary-offset: 0 | |
2094 | * c-brace-offset: -4 | |
2095 | * c-argdecl-indent: 4 | |
2096 | * c-label-offset: -4 | |
2097 | * c-continued-statement-offset: 4 | |
2098 | * c-continued-brace-offset: 0 | |
2099 | * indent-tabs-mode: 1 | |
2100 | * tab-width: 8 | |
2101 | * End: | |
2102 | */ |