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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/kmod.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/ctype.h> | |
16 | #include <linux/major.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/buffer_head.h> | |
a885c8c4 | 19 | #include <linux/hdreg.h> |
1da177e4 LT |
20 | |
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/ebcdic.h> | |
23 | #include <asm/idals.h> | |
24 | #include <asm/todclk.h> | |
f3eb5384 | 25 | #include <asm/itcw.h> |
1da177e4 LT |
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; | |
2b67fc46 | 41 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
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"); | |
1da177e4 LT |
47 | MODULE_LICENSE("GPL"); |
48 | ||
49 | /* | |
50 | * SECTION: prototypes for static functions of dasd.c | |
51 | */ | |
8e09f215 SW |
52 | static int dasd_alloc_queue(struct dasd_block *); |
53 | static void dasd_setup_queue(struct dasd_block *); | |
54 | static void dasd_free_queue(struct dasd_block *); | |
55 | static void dasd_flush_request_queue(struct dasd_block *); | |
56 | static int dasd_flush_block_queue(struct dasd_block *); | |
57 | static void dasd_device_tasklet(struct dasd_device *); | |
58 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 59 | static void do_kick_device(struct work_struct *); |
8e09f215 | 60 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
61 | static void dasd_device_timeout(unsigned long); |
62 | static void dasd_block_timeout(unsigned long); | |
1da177e4 LT |
63 | |
64 | /* | |
65 | * SECTION: Operations on the device structure. | |
66 | */ | |
67 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 68 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 69 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
70 | |
71 | /* | |
72 | * Allocate memory for a new device structure. | |
73 | */ | |
8e09f215 | 74 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
75 | { |
76 | struct dasd_device *device; | |
77 | ||
8e09f215 SW |
78 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
79 | if (!device) | |
1da177e4 | 80 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
81 | |
82 | /* Get two pages for normal block device operations. */ | |
83 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 84 | if (!device->ccw_mem) { |
1da177e4 LT |
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); | |
8e09f215 | 90 | if (!device->erp_mem) { |
1da177e4 LT |
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); | |
8e09f215 | 99 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 100 | tasklet_init(&device->tasklet, |
8e09f215 | 101 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
102 | (unsigned long) device); |
103 | INIT_LIST_HEAD(&device->ccw_queue); | |
104 | init_timer(&device->timer); | |
48cae885 SW |
105 | device->timer.function = dasd_device_timeout; |
106 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 107 | INIT_WORK(&device->kick_work, do_kick_device); |
1da177e4 LT |
108 | device->state = DASD_STATE_NEW; |
109 | device->target = DASD_STATE_NEW; | |
110 | ||
111 | return device; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Free memory of a device structure. | |
116 | */ | |
8e09f215 | 117 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 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 | ||
8e09f215 SW |
125 | /* |
126 | * Allocate memory for a new device structure. | |
127 | */ | |
128 | struct dasd_block *dasd_alloc_block(void) | |
129 | { | |
130 | struct dasd_block *block; | |
131 | ||
132 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
133 | if (!block) | |
134 | return ERR_PTR(-ENOMEM); | |
135 | /* open_count = 0 means device online but not in use */ | |
136 | atomic_set(&block->open_count, -1); | |
137 | ||
138 | spin_lock_init(&block->request_queue_lock); | |
139 | atomic_set(&block->tasklet_scheduled, 0); | |
140 | tasklet_init(&block->tasklet, | |
141 | (void (*)(unsigned long)) dasd_block_tasklet, | |
142 | (unsigned long) block); | |
143 | INIT_LIST_HEAD(&block->ccw_queue); | |
144 | spin_lock_init(&block->queue_lock); | |
145 | init_timer(&block->timer); | |
48cae885 SW |
146 | block->timer.function = dasd_block_timeout; |
147 | block->timer.data = (unsigned long) block; | |
8e09f215 SW |
148 | |
149 | return block; | |
150 | } | |
151 | ||
152 | /* | |
153 | * Free memory of a device structure. | |
154 | */ | |
155 | void dasd_free_block(struct dasd_block *block) | |
156 | { | |
157 | kfree(block); | |
158 | } | |
159 | ||
1da177e4 LT |
160 | /* |
161 | * Make a new device known to the system. | |
162 | */ | |
8e09f215 | 163 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
164 | { |
165 | int rc; | |
166 | ||
167 | /* | |
138c014d | 168 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
169 | * keep the reference count > 0. |
170 | */ | |
171 | dasd_get_device(device); | |
172 | ||
8e09f215 SW |
173 | if (device->block) { |
174 | rc = dasd_alloc_queue(device->block); | |
175 | if (rc) { | |
176 | dasd_put_device(device); | |
177 | return rc; | |
178 | } | |
1da177e4 | 179 | } |
1da177e4 LT |
180 | device->state = DASD_STATE_KNOWN; |
181 | return 0; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Let the system forget about a device. | |
186 | */ | |
8e09f215 | 187 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 188 | { |
20c64468 SW |
189 | /* Disable extended error reporting for this device. */ |
190 | dasd_eer_disable(device); | |
1da177e4 | 191 | /* Forget the discipline information. */ |
8e09f215 SW |
192 | if (device->discipline) { |
193 | if (device->discipline->uncheck_device) | |
194 | device->discipline->uncheck_device(device); | |
aa88861f | 195 | module_put(device->discipline->owner); |
8e09f215 | 196 | } |
1da177e4 | 197 | device->discipline = NULL; |
aa88861f PO |
198 | if (device->base_discipline) |
199 | module_put(device->base_discipline->owner); | |
200 | device->base_discipline = NULL; | |
1da177e4 LT |
201 | device->state = DASD_STATE_NEW; |
202 | ||
8e09f215 SW |
203 | if (device->block) |
204 | dasd_free_queue(device->block); | |
1da177e4 LT |
205 | |
206 | /* Give up reference we took in dasd_state_new_to_known. */ | |
207 | dasd_put_device(device); | |
8f61701b | 208 | return 0; |
1da177e4 LT |
209 | } |
210 | ||
211 | /* | |
212 | * Request the irq line for the device. | |
213 | */ | |
8e09f215 | 214 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
215 | { |
216 | int rc; | |
217 | ||
218 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
219 | if (device->block) { |
220 | rc = dasd_gendisk_alloc(device->block); | |
221 | if (rc) | |
222 | return rc; | |
223 | } | |
1da177e4 | 224 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
2a0217d5 | 225 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 1, 1, |
8e09f215 | 226 | 8 * sizeof(long)); |
1da177e4 | 227 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 228 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
229 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
230 | ||
231 | device->state = DASD_STATE_BASIC; | |
232 | return 0; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Release the irq line for the device. Terminate any running i/o. | |
237 | */ | |
8e09f215 | 238 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 239 | { |
8f61701b | 240 | int rc; |
8e09f215 SW |
241 | if (device->block) { |
242 | dasd_gendisk_free(device->block); | |
243 | dasd_block_clear_timer(device->block); | |
244 | } | |
245 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
246 | if (rc) |
247 | return rc; | |
8e09f215 | 248 | dasd_device_clear_timer(device); |
8f61701b | 249 | |
1da177e4 LT |
250 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
251 | if (device->debug_area != NULL) { | |
252 | debug_unregister(device->debug_area); | |
253 | device->debug_area = NULL; | |
254 | } | |
255 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 256 | return 0; |
1da177e4 LT |
257 | } |
258 | ||
259 | /* | |
260 | * Do the initial analysis. The do_analysis function may return | |
261 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
262 | * until the discipline decides to continue the startup sequence | |
263 | * by calling the function dasd_change_state. The eckd disciplines | |
264 | * uses this to start a ccw that detects the format. The completion | |
265 | * interrupt for this detection ccw uses the kernel event daemon to | |
266 | * trigger the call to dasd_change_state. All this is done in the | |
267 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
268 | * After the analysis ccw is done (do_analysis returned 0) the block |
269 | * device is setup. | |
270 | * In case the analysis returns an error, the device setup is stopped | |
271 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 272 | */ |
8e09f215 | 273 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
274 | { |
275 | int rc; | |
8e09f215 | 276 | struct dasd_block *block; |
1da177e4 LT |
277 | |
278 | rc = 0; | |
8e09f215 | 279 | block = device->block; |
90f0094d | 280 | /* make disk known with correct capacity */ |
8e09f215 SW |
281 | if (block) { |
282 | if (block->base->discipline->do_analysis != NULL) | |
283 | rc = block->base->discipline->do_analysis(block); | |
284 | if (rc) { | |
285 | if (rc != -EAGAIN) | |
286 | device->state = DASD_STATE_UNFMT; | |
287 | return rc; | |
288 | } | |
289 | dasd_setup_queue(block); | |
290 | set_capacity(block->gdp, | |
291 | block->blocks << block->s2b_shift); | |
292 | device->state = DASD_STATE_READY; | |
293 | rc = dasd_scan_partitions(block); | |
294 | if (rc) | |
295 | device->state = DASD_STATE_BASIC; | |
296 | } else { | |
297 | device->state = DASD_STATE_READY; | |
298 | } | |
90f0094d | 299 | return rc; |
1da177e4 LT |
300 | } |
301 | ||
302 | /* | |
303 | * Remove device from block device layer. Destroy dirty buffers. | |
304 | * Forget format information. Check if the target level is basic | |
305 | * and if it is create fake disk for formatting. | |
306 | */ | |
8e09f215 | 307 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 308 | { |
8f61701b HH |
309 | int rc; |
310 | ||
1da177e4 | 311 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
312 | if (device->block) { |
313 | struct dasd_block *block = device->block; | |
314 | rc = dasd_flush_block_queue(block); | |
315 | if (rc) { | |
316 | device->state = DASD_STATE_READY; | |
317 | return rc; | |
318 | } | |
319 | dasd_destroy_partitions(block); | |
320 | dasd_flush_request_queue(block); | |
321 | block->blocks = 0; | |
322 | block->bp_block = 0; | |
323 | block->s2b_shift = 0; | |
324 | } | |
8f61701b | 325 | return 0; |
1da177e4 LT |
326 | } |
327 | ||
90f0094d HH |
328 | /* |
329 | * Back to basic. | |
330 | */ | |
8e09f215 | 331 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
332 | { |
333 | device->state = DASD_STATE_BASIC; | |
8f61701b | 334 | return 0; |
90f0094d HH |
335 | } |
336 | ||
1da177e4 LT |
337 | /* |
338 | * Make the device online and schedule the bottom half to start | |
339 | * the requeueing of requests from the linux request queue to the | |
340 | * ccw queue. | |
341 | */ | |
8f61701b | 342 | static int |
1da177e4 LT |
343 | dasd_state_ready_to_online(struct dasd_device * device) |
344 | { | |
8e09f215 | 345 | int rc; |
1301809b SW |
346 | struct gendisk *disk; |
347 | struct disk_part_iter piter; | |
348 | struct hd_struct *part; | |
8e09f215 SW |
349 | |
350 | if (device->discipline->ready_to_online) { | |
351 | rc = device->discipline->ready_to_online(device); | |
352 | if (rc) | |
353 | return rc; | |
354 | } | |
1da177e4 | 355 | device->state = DASD_STATE_ONLINE; |
1301809b | 356 | if (device->block) { |
8e09f215 | 357 | dasd_schedule_block_bh(device->block); |
1301809b SW |
358 | disk = device->block->bdev->bd_disk; |
359 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
360 | while ((part = disk_part_iter_next(&piter))) | |
361 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
362 | disk_part_iter_exit(&piter); | |
363 | } | |
1da177e4 LT |
364 | return 0; |
365 | } | |
366 | ||
367 | /* | |
368 | * Stop the requeueing of requests again. | |
369 | */ | |
8e09f215 | 370 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 371 | { |
8e09f215 | 372 | int rc; |
1301809b SW |
373 | struct gendisk *disk; |
374 | struct disk_part_iter piter; | |
375 | struct hd_struct *part; | |
8e09f215 SW |
376 | |
377 | if (device->discipline->online_to_ready) { | |
378 | rc = device->discipline->online_to_ready(device); | |
379 | if (rc) | |
380 | return rc; | |
381 | } | |
1da177e4 | 382 | device->state = DASD_STATE_READY; |
1301809b SW |
383 | if (device->block) { |
384 | disk = device->block->bdev->bd_disk; | |
385 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
386 | while ((part = disk_part_iter_next(&piter))) | |
387 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
388 | disk_part_iter_exit(&piter); | |
389 | } | |
8f61701b | 390 | return 0; |
1da177e4 LT |
391 | } |
392 | ||
393 | /* | |
394 | * Device startup state changes. | |
395 | */ | |
8e09f215 | 396 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
397 | { |
398 | int rc; | |
399 | ||
400 | rc = 0; | |
401 | if (device->state == DASD_STATE_NEW && | |
402 | device->target >= DASD_STATE_KNOWN) | |
403 | rc = dasd_state_new_to_known(device); | |
404 | ||
405 | if (!rc && | |
406 | device->state == DASD_STATE_KNOWN && | |
407 | device->target >= DASD_STATE_BASIC) | |
408 | rc = dasd_state_known_to_basic(device); | |
409 | ||
410 | if (!rc && | |
411 | device->state == DASD_STATE_BASIC && | |
412 | device->target >= DASD_STATE_READY) | |
413 | rc = dasd_state_basic_to_ready(device); | |
414 | ||
39ccf95e HH |
415 | if (!rc && |
416 | device->state == DASD_STATE_UNFMT && | |
417 | device->target > DASD_STATE_UNFMT) | |
418 | rc = -EPERM; | |
419 | ||
1da177e4 LT |
420 | if (!rc && |
421 | device->state == DASD_STATE_READY && | |
422 | device->target >= DASD_STATE_ONLINE) | |
423 | rc = dasd_state_ready_to_online(device); | |
424 | ||
425 | return rc; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Device shutdown state changes. | |
430 | */ | |
8e09f215 | 431 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 432 | { |
8f61701b HH |
433 | int rc; |
434 | ||
435 | rc = 0; | |
1da177e4 LT |
436 | if (device->state == DASD_STATE_ONLINE && |
437 | device->target <= DASD_STATE_READY) | |
8f61701b | 438 | rc = dasd_state_online_to_ready(device); |
138c014d | 439 | |
8f61701b HH |
440 | if (!rc && |
441 | device->state == DASD_STATE_READY && | |
1da177e4 | 442 | device->target <= DASD_STATE_BASIC) |
8f61701b | 443 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 444 | |
8f61701b HH |
445 | if (!rc && |
446 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 447 | device->target <= DASD_STATE_BASIC) |
8f61701b | 448 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 449 | |
8f61701b HH |
450 | if (!rc && |
451 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 452 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 453 | rc = dasd_state_basic_to_known(device); |
138c014d | 454 | |
8f61701b HH |
455 | if (!rc && |
456 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 457 | device->target <= DASD_STATE_NEW) |
8f61701b | 458 | rc = dasd_state_known_to_new(device); |
1da177e4 | 459 | |
8f61701b | 460 | return rc; |
1da177e4 LT |
461 | } |
462 | ||
463 | /* | |
464 | * This is the main startup/shutdown routine. | |
465 | */ | |
8e09f215 | 466 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 LT |
467 | { |
468 | int rc; | |
469 | ||
470 | if (device->state == device->target) | |
471 | /* Already where we want to go today... */ | |
472 | return; | |
473 | if (device->state < device->target) | |
474 | rc = dasd_increase_state(device); | |
475 | else | |
476 | rc = dasd_decrease_state(device); | |
477 | if (rc && rc != -EAGAIN) | |
478 | device->target = device->state; | |
479 | ||
480 | if (device->state == device->target) | |
481 | wake_up(&dasd_init_waitq); | |
4dfd5c45 HH |
482 | |
483 | /* let user-space know that the device status changed */ | |
484 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
485 | } |
486 | ||
487 | /* | |
488 | * Kick starter for devices that did not complete the startup/shutdown | |
489 | * procedure or were sleeping because of a pending state. | |
490 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
491 | * event daemon. | |
492 | */ | |
8e09f215 | 493 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 494 | { |
4927b3f7 | 495 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
1da177e4 | 496 | dasd_change_state(device); |
8e09f215 | 497 | dasd_schedule_device_bh(device); |
1da177e4 LT |
498 | dasd_put_device(device); |
499 | } | |
500 | ||
8e09f215 | 501 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
502 | { |
503 | dasd_get_device(device); | |
504 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
505 | schedule_work(&device->kick_work); | |
506 | } | |
507 | ||
508 | /* | |
509 | * Set the target state for a device and starts the state change. | |
510 | */ | |
8e09f215 | 511 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 LT |
512 | { |
513 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
514 | if (dasd_probeonly && target > DASD_STATE_READY) | |
515 | target = DASD_STATE_READY; | |
516 | if (device->target != target) { | |
517 | if (device->state == target) | |
518 | wake_up(&dasd_init_waitq); | |
519 | device->target = target; | |
520 | } | |
521 | if (device->state != device->target) | |
522 | dasd_change_state(device); | |
523 | } | |
524 | ||
525 | /* | |
526 | * Enable devices with device numbers in [from..to]. | |
527 | */ | |
8e09f215 | 528 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
529 | { |
530 | return (device->state == device->target); | |
531 | } | |
532 | ||
8e09f215 | 533 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
534 | { |
535 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
536 | if (device->state <= DASD_STATE_KNOWN) | |
537 | /* No discipline for device found. */ | |
538 | dasd_set_target_state(device, DASD_STATE_NEW); | |
539 | /* Now wait for the devices to come up. */ | |
540 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
541 | } | |
542 | ||
543 | /* | |
544 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
545 | */ | |
546 | #ifdef CONFIG_DASD_PROFILE | |
547 | ||
548 | struct dasd_profile_info_t dasd_global_profile; | |
549 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
550 | ||
551 | /* | |
552 | * Increments counter in global and local profiling structures. | |
553 | */ | |
8e09f215 | 554 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
555 | { \ |
556 | int index; \ | |
557 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
558 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 559 | block->profile.counter[index]++; \ |
1da177e4 LT |
560 | } |
561 | ||
562 | /* | |
563 | * Add profiling information for cqr before execution. | |
564 | */ | |
8e09f215 SW |
565 | static void dasd_profile_start(struct dasd_block *block, |
566 | struct dasd_ccw_req *cqr, | |
567 | struct request *req) | |
1da177e4 LT |
568 | { |
569 | struct list_head *l; | |
570 | unsigned int counter; | |
571 | ||
572 | if (dasd_profile_level != DASD_PROFILE_ON) | |
573 | return; | |
574 | ||
575 | /* count the length of the chanq for statistics */ | |
576 | counter = 0; | |
8e09f215 | 577 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
578 | if (++counter >= 31) |
579 | break; | |
580 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 581 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
582 | } |
583 | ||
584 | /* | |
585 | * Add profiling information for cqr after execution. | |
586 | */ | |
8e09f215 SW |
587 | static void dasd_profile_end(struct dasd_block *block, |
588 | struct dasd_ccw_req *cqr, | |
589 | struct request *req) | |
1da177e4 LT |
590 | { |
591 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
592 | long tottimeps, sectors; | |
593 | ||
594 | if (dasd_profile_level != DASD_PROFILE_ON) | |
595 | return; | |
596 | ||
597 | sectors = req->nr_sectors; | |
598 | if (!cqr->buildclk || !cqr->startclk || | |
599 | !cqr->stopclk || !cqr->endclk || | |
600 | !sectors) | |
601 | return; | |
602 | ||
603 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
604 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
605 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
606 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
607 | tottimeps = tottime / sectors; | |
608 | ||
609 | if (!dasd_global_profile.dasd_io_reqs) | |
610 | memset(&dasd_global_profile, 0, | |
8e09f215 | 611 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
612 | dasd_global_profile.dasd_io_reqs++; |
613 | dasd_global_profile.dasd_io_sects += sectors; | |
614 | ||
8e09f215 SW |
615 | if (!block->profile.dasd_io_reqs) |
616 | memset(&block->profile, 0, | |
617 | sizeof(struct dasd_profile_info_t)); | |
618 | block->profile.dasd_io_reqs++; | |
619 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 620 | |
8e09f215 SW |
621 | dasd_profile_counter(sectors, dasd_io_secs, block); |
622 | dasd_profile_counter(tottime, dasd_io_times, block); | |
623 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
624 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
625 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
626 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
627 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
628 | } |
629 | #else | |
8e09f215 SW |
630 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
631 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
632 | #endif /* CONFIG_DASD_PROFILE */ |
633 | ||
634 | /* | |
635 | * Allocate memory for a channel program with 'cplength' channel | |
636 | * command words and 'datasize' additional space. There are two | |
637 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
638 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
639 | * that gets allocated for each device. | |
640 | */ | |
8e09f215 SW |
641 | struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength, |
642 | int datasize, | |
643 | struct dasd_device *device) | |
1da177e4 LT |
644 | { |
645 | struct dasd_ccw_req *cqr; | |
646 | ||
647 | /* Sanity checks */ | |
7ac1e877 ES |
648 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
649 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 650 | |
88abaab4 | 651 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
652 | if (cqr == NULL) |
653 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
654 | cqr->cpaddr = NULL; |
655 | if (cplength > 0) { | |
88abaab4 | 656 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
657 | GFP_ATOMIC | GFP_DMA); |
658 | if (cqr->cpaddr == NULL) { | |
659 | kfree(cqr); | |
660 | return ERR_PTR(-ENOMEM); | |
661 | } | |
1da177e4 LT |
662 | } |
663 | cqr->data = NULL; | |
664 | if (datasize > 0) { | |
88abaab4 | 665 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 666 | if (cqr->data == NULL) { |
17fd682e | 667 | kfree(cqr->cpaddr); |
1da177e4 LT |
668 | kfree(cqr); |
669 | return ERR_PTR(-ENOMEM); | |
670 | } | |
1da177e4 LT |
671 | } |
672 | strncpy((char *) &cqr->magic, magic, 4); | |
673 | ASCEBC((char *) &cqr->magic, 4); | |
674 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
675 | dasd_get_device(device); | |
676 | return cqr; | |
677 | } | |
678 | ||
8e09f215 SW |
679 | struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, |
680 | int datasize, | |
681 | struct dasd_device *device) | |
1da177e4 LT |
682 | { |
683 | unsigned long flags; | |
684 | struct dasd_ccw_req *cqr; | |
685 | char *data; | |
686 | int size; | |
687 | ||
688 | /* Sanity checks */ | |
7ac1e877 ES |
689 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
690 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
691 | |
692 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
693 | if (cplength > 0) | |
694 | size += cplength * sizeof(struct ccw1); | |
695 | if (datasize > 0) | |
696 | size += datasize; | |
697 | spin_lock_irqsave(&device->mem_lock, flags); | |
698 | cqr = (struct dasd_ccw_req *) | |
699 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
700 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
701 | if (cqr == NULL) | |
702 | return ERR_PTR(-ENOMEM); | |
703 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
704 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
705 | cqr->cpaddr = NULL; | |
706 | if (cplength > 0) { | |
707 | cqr->cpaddr = (struct ccw1 *) data; | |
708 | data += cplength*sizeof(struct ccw1); | |
709 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
710 | } | |
711 | cqr->data = NULL; | |
712 | if (datasize > 0) { | |
713 | cqr->data = data; | |
714 | memset(cqr->data, 0, datasize); | |
715 | } | |
716 | strncpy((char *) &cqr->magic, magic, 4); | |
717 | ASCEBC((char *) &cqr->magic, 4); | |
718 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
719 | dasd_get_device(device); | |
720 | return cqr; | |
721 | } | |
722 | ||
723 | /* | |
724 | * Free memory of a channel program. This function needs to free all the | |
725 | * idal lists that might have been created by dasd_set_cda and the | |
726 | * struct dasd_ccw_req itself. | |
727 | */ | |
8e09f215 | 728 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 729 | { |
347a8dc3 | 730 | #ifdef CONFIG_64BIT |
1da177e4 LT |
731 | struct ccw1 *ccw; |
732 | ||
733 | /* Clear any idals used for the request. */ | |
734 | ccw = cqr->cpaddr; | |
735 | do { | |
736 | clear_normalized_cda(ccw); | |
737 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
738 | #endif | |
17fd682e JJ |
739 | kfree(cqr->cpaddr); |
740 | kfree(cqr->data); | |
1da177e4 LT |
741 | kfree(cqr); |
742 | dasd_put_device(device); | |
743 | } | |
744 | ||
8e09f215 | 745 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
746 | { |
747 | unsigned long flags; | |
748 | ||
749 | spin_lock_irqsave(&device->mem_lock, flags); | |
750 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
751 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
752 | dasd_put_device(device); | |
753 | } | |
754 | ||
755 | /* | |
756 | * Check discipline magic in cqr. | |
757 | */ | |
8e09f215 | 758 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
759 | { |
760 | struct dasd_device *device; | |
761 | ||
762 | if (cqr == NULL) | |
763 | return -EINVAL; | |
8e09f215 | 764 | device = cqr->startdev; |
1da177e4 LT |
765 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
766 | DEV_MESSAGE(KERN_WARNING, device, | |
767 | " dasd_ccw_req 0x%08x magic doesn't match" | |
768 | " discipline 0x%08x", | |
769 | cqr->magic, | |
770 | *(unsigned int *) device->discipline->name); | |
771 | return -EINVAL; | |
772 | } | |
773 | return 0; | |
774 | } | |
775 | ||
776 | /* | |
777 | * Terminate the current i/o and set the request to clear_pending. | |
778 | * Timer keeps device runnig. | |
779 | * ccw_device_clear can fail if the i/o subsystem | |
780 | * is in a bad mood. | |
781 | */ | |
8e09f215 | 782 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
783 | { |
784 | struct dasd_device *device; | |
785 | int retries, rc; | |
786 | ||
787 | /* Check the cqr */ | |
788 | rc = dasd_check_cqr(cqr); | |
789 | if (rc) | |
790 | return rc; | |
791 | retries = 0; | |
8e09f215 | 792 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
793 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
794 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
795 | switch (rc) { | |
796 | case 0: /* termination successful */ | |
c2ba444d | 797 | cqr->retries--; |
8e09f215 | 798 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 799 | cqr->stopclk = get_clock(); |
8f61701b | 800 | cqr->starttime = 0; |
1da177e4 LT |
801 | DBF_DEV_EVENT(DBF_DEBUG, device, |
802 | "terminate cqr %p successful", | |
803 | cqr); | |
804 | break; | |
805 | case -ENODEV: | |
806 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
807 | "device gone, retry"); | |
808 | break; | |
809 | case -EIO: | |
810 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
811 | "I/O error, retry"); | |
812 | break; | |
813 | case -EINVAL: | |
814 | case -EBUSY: | |
815 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
816 | "device busy, retry later"); | |
817 | break; | |
818 | default: | |
819 | DEV_MESSAGE(KERN_ERR, device, | |
820 | "line %d unknown RC=%d, please " | |
821 | "report to linux390@de.ibm.com", | |
822 | __LINE__, rc); | |
823 | BUG(); | |
824 | break; | |
825 | } | |
826 | retries++; | |
827 | } | |
8e09f215 | 828 | dasd_schedule_device_bh(device); |
1da177e4 LT |
829 | return rc; |
830 | } | |
831 | ||
832 | /* | |
833 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
834 | * In that case set up a timer to start the request later. | |
835 | */ | |
8e09f215 | 836 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
837 | { |
838 | struct dasd_device *device; | |
839 | int rc; | |
840 | ||
841 | /* Check the cqr */ | |
842 | rc = dasd_check_cqr(cqr); | |
843 | if (rc) | |
844 | return rc; | |
8e09f215 | 845 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
846 | if (cqr->retries < 0) { |
847 | DEV_MESSAGE(KERN_DEBUG, device, | |
848 | "start_IO: request %p (%02x/%i) - no retry left.", | |
849 | cqr, cqr->status, cqr->retries); | |
8e09f215 | 850 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
851 | return -EIO; |
852 | } | |
853 | cqr->startclk = get_clock(); | |
854 | cqr->starttime = jiffies; | |
855 | cqr->retries--; | |
f3eb5384 SW |
856 | if (cqr->cpmode == 1) { |
857 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
858 | (long) cqr, cqr->lpm); | |
859 | } else { | |
860 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
861 | (long) cqr, cqr->lpm, 0); | |
862 | } | |
1da177e4 LT |
863 | switch (rc) { |
864 | case 0: | |
865 | cqr->status = DASD_CQR_IN_IO; | |
866 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
867 | "start_IO: request %p started successful", | |
868 | cqr); | |
869 | break; | |
870 | case -EBUSY: | |
871 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
872 | "start_IO: device busy, retry later"); | |
873 | break; | |
874 | case -ETIMEDOUT: | |
875 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
876 | "start_IO: request timeout, retry later"); | |
877 | break; | |
878 | case -EACCES: | |
879 | /* -EACCES indicates that the request used only a | |
880 | * subset of the available pathes and all these | |
881 | * pathes are gone. | |
882 | * Do a retry with all available pathes. | |
883 | */ | |
884 | cqr->lpm = LPM_ANYPATH; | |
885 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
886 | "start_IO: selected pathes gone," | |
887 | " retry on all pathes"); | |
888 | break; | |
889 | case -ENODEV: | |
f3eb5384 SW |
890 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
891 | "start_IO: -ENODEV device gone, retry"); | |
892 | break; | |
1da177e4 LT |
893 | case -EIO: |
894 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
f3eb5384 | 895 | "start_IO: -EIO device gone, retry"); |
1da177e4 LT |
896 | break; |
897 | default: | |
898 | DEV_MESSAGE(KERN_ERR, device, | |
899 | "line %d unknown RC=%d, please report" | |
900 | " to linux390@de.ibm.com", __LINE__, rc); | |
901 | BUG(); | |
902 | break; | |
903 | } | |
904 | return rc; | |
905 | } | |
906 | ||
907 | /* | |
908 | * Timeout function for dasd devices. This is used for different purposes | |
909 | * 1) missing interrupt handler for normal operation | |
910 | * 2) delayed start of request where start_IO failed with -EBUSY | |
911 | * 3) timeout for missing state change interrupts | |
912 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
913 | * DASD_CQR_QUEUED for 2) and 3). | |
914 | */ | |
8e09f215 | 915 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
916 | { |
917 | unsigned long flags; | |
918 | struct dasd_device *device; | |
919 | ||
920 | device = (struct dasd_device *) ptr; | |
921 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
922 | /* re-activate request queue */ | |
923 | device->stopped &= ~DASD_STOPPED_PENDING; | |
924 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
8e09f215 | 925 | dasd_schedule_device_bh(device); |
1da177e4 LT |
926 | } |
927 | ||
928 | /* | |
929 | * Setup timeout for a device in jiffies. | |
930 | */ | |
8e09f215 | 931 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 932 | { |
48cae885 SW |
933 | if (expires == 0) |
934 | del_timer(&device->timer); | |
935 | else | |
936 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 LT |
937 | } |
938 | ||
939 | /* | |
940 | * Clear timeout for a device. | |
941 | */ | |
8e09f215 | 942 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 943 | { |
48cae885 | 944 | del_timer(&device->timer); |
1da177e4 LT |
945 | } |
946 | ||
8e09f215 SW |
947 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
948 | unsigned long intparm) | |
1da177e4 LT |
949 | { |
950 | struct dasd_ccw_req *cqr; | |
951 | struct dasd_device *device; | |
952 | ||
f16f5843 SW |
953 | if (!intparm) |
954 | return; | |
1da177e4 LT |
955 | cqr = (struct dasd_ccw_req *) intparm; |
956 | if (cqr->status != DASD_CQR_IN_IO) { | |
957 | MESSAGE(KERN_DEBUG, | |
958 | "invalid status in handle_killed_request: " | |
959 | "bus_id %s, status %02x", | |
2a0217d5 | 960 | dev_name(&cdev->dev), cqr->status); |
1da177e4 LT |
961 | return; |
962 | } | |
963 | ||
8e09f215 | 964 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 965 | if (device == NULL || |
a00bfd71 | 966 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 LT |
967 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
968 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
2a0217d5 | 969 | dev_name(&cdev->dev)); |
1da177e4 LT |
970 | return; |
971 | } | |
972 | ||
973 | /* Schedule request to be retried. */ | |
974 | cqr->status = DASD_CQR_QUEUED; | |
975 | ||
8e09f215 SW |
976 | dasd_device_clear_timer(device); |
977 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
978 | dasd_put_device(device); |
979 | } | |
980 | ||
8e09f215 | 981 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 982 | { |
20c64468 SW |
983 | /* First of all start sense subsystem status request. */ |
984 | dasd_eer_snss(device); | |
985 | ||
1da177e4 | 986 | device->stopped &= ~DASD_STOPPED_PENDING; |
8e09f215 SW |
987 | dasd_schedule_device_bh(device); |
988 | if (device->block) | |
989 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
990 | } |
991 | ||
992 | /* | |
993 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
994 | */ | |
8e09f215 SW |
995 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
996 | struct irb *irb) | |
1da177e4 LT |
997 | { |
998 | struct dasd_ccw_req *cqr, *next; | |
999 | struct dasd_device *device; | |
1000 | unsigned long long now; | |
1001 | int expires; | |
1da177e4 LT |
1002 | |
1003 | if (IS_ERR(irb)) { | |
1004 | switch (PTR_ERR(irb)) { | |
1005 | case -EIO: | |
1da177e4 LT |
1006 | break; |
1007 | case -ETIMEDOUT: | |
1008 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
2a0217d5 | 1009 | __func__, dev_name(&cdev->dev)); |
1da177e4 LT |
1010 | break; |
1011 | default: | |
1012 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
2a0217d5 | 1013 | __func__, dev_name(&cdev->dev), PTR_ERR(irb)); |
1da177e4 | 1014 | } |
f16f5843 | 1015 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1016 | return; |
1017 | } | |
1018 | ||
1019 | now = get_clock(); | |
1020 | ||
1021 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
2a0217d5 | 1022 | dev_name(&cdev->dev), ((irb->scsw.cmd.cstat << 8) | |
23d805b6 | 1023 | irb->scsw.cmd.dstat), (unsigned int) intparm); |
1da177e4 | 1024 | |
8e09f215 SW |
1025 | /* check for unsolicited interrupts */ |
1026 | cqr = (struct dasd_ccw_req *) intparm; | |
f3eb5384 SW |
1027 | if (!cqr || ((scsw_cc(&irb->scsw) == 1) && |
1028 | (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) && | |
1029 | (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) { | |
8e09f215 SW |
1030 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
1031 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1032 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1033 | if (!IS_ERR(device)) { |
8e09f215 SW |
1034 | dasd_device_clear_timer(device); |
1035 | device->discipline->handle_unsolicited_interrupt(device, | |
1036 | irb); | |
1da177e4 LT |
1037 | dasd_put_device(device); |
1038 | } | |
1039 | return; | |
1040 | } | |
1041 | ||
8e09f215 SW |
1042 | device = (struct dasd_device *) cqr->startdev; |
1043 | if (!device || | |
1da177e4 LT |
1044 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
1045 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
2a0217d5 | 1046 | dev_name(&cdev->dev)); |
1da177e4 LT |
1047 | return; |
1048 | } | |
1049 | ||
1050 | /* Check for clear pending */ | |
8e09f215 | 1051 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1052 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1053 | cqr->status = DASD_CQR_CLEARED; |
1054 | dasd_device_clear_timer(device); | |
8f61701b | 1055 | wake_up(&dasd_flush_wq); |
8e09f215 | 1056 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1057 | return; |
1058 | } | |
1059 | ||
f3eb5384 | 1060 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 LT |
1061 | if (cqr->status != DASD_CQR_IN_IO) { |
1062 | MESSAGE(KERN_DEBUG, | |
1063 | "invalid status: bus_id %s, status %02x", | |
2a0217d5 | 1064 | dev_name(&cdev->dev), cqr->status); |
1da177e4 LT |
1065 | return; |
1066 | } | |
1067 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
23d805b6 | 1068 | ((irb->scsw.cmd.cstat << 8) | irb->scsw.cmd.dstat), cqr); |
8e09f215 | 1069 | next = NULL; |
1da177e4 | 1070 | expires = 0; |
f3eb5384 SW |
1071 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1072 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1073 | /* request was completed successfully */ |
1074 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1075 | cqr->stopclk = now; |
1076 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1077 | if (cqr->devlist.next != &device->ccw_queue) { |
1078 | next = list_entry(cqr->devlist.next, | |
1079 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1080 | } |
8e09f215 SW |
1081 | } else { /* error */ |
1082 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
9575bf26 | 1083 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1084 | dasd_log_sense(cqr, irb); |
1085 | } | |
6c5f57c7 SH |
1086 | /* |
1087 | * If we don't want complex ERP for this request, then just | |
1088 | * reset this and retry it in the fastpath | |
8e09f215 | 1089 | */ |
6c5f57c7 | 1090 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 SW |
1091 | cqr->retries > 0) { |
1092 | DEV_MESSAGE(KERN_DEBUG, device, | |
1093 | "default ERP in fastpath (%i retries left)", | |
1094 | cqr->retries); | |
1095 | cqr->lpm = LPM_ANYPATH; | |
1096 | cqr->status = DASD_CQR_QUEUED; | |
1097 | next = cqr; | |
1098 | } else | |
1da177e4 | 1099 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1100 | } |
1101 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1102 | (!device->stopped)) { | |
1103 | if (device->discipline->start_IO(next) == 0) | |
1104 | expires = next->expires; | |
1105 | else | |
1106 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1107 | "Interrupt fastpath " | |
1108 | "failed!"); | |
1da177e4 LT |
1109 | } |
1110 | if (expires != 0) | |
8e09f215 | 1111 | dasd_device_set_timer(device, expires); |
1da177e4 | 1112 | else |
8e09f215 SW |
1113 | dasd_device_clear_timer(device); |
1114 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1115 | } |
1116 | ||
1117 | /* | |
8e09f215 SW |
1118 | * If we have an error on a dasd_block layer request then we cancel |
1119 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1120 | */ |
8e09f215 SW |
1121 | static void __dasd_device_recovery(struct dasd_device *device, |
1122 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1123 | { |
8e09f215 SW |
1124 | struct list_head *l, *n; |
1125 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1126 | |
8e09f215 SW |
1127 | /* |
1128 | * only requeue request that came from the dasd_block layer | |
1129 | */ | |
1130 | if (!ref_cqr->block) | |
1131 | return; | |
1da177e4 | 1132 | |
8e09f215 SW |
1133 | list_for_each_safe(l, n, &device->ccw_queue) { |
1134 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1135 | if (cqr->status == DASD_CQR_QUEUED && | |
1136 | ref_cqr->block == cqr->block) { | |
1137 | cqr->status = DASD_CQR_CLEARED; | |
1138 | } | |
1139 | } | |
1140 | }; | |
1da177e4 LT |
1141 | |
1142 | /* | |
8e09f215 SW |
1143 | * Remove those ccw requests from the queue that need to be returned |
1144 | * to the upper layer. | |
1da177e4 | 1145 | */ |
8e09f215 SW |
1146 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1147 | struct list_head *final_queue) | |
1da177e4 LT |
1148 | { |
1149 | struct list_head *l, *n; | |
1150 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1151 | |
1da177e4 LT |
1152 | /* Process request with final status. */ |
1153 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1154 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1155 | ||
1da177e4 | 1156 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1157 | if (cqr->status == DASD_CQR_QUEUED || |
1158 | cqr->status == DASD_CQR_IN_IO || | |
1159 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1160 | break; |
1da177e4 | 1161 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1162 | __dasd_device_recovery(device, cqr); |
20c64468 | 1163 | } |
1da177e4 | 1164 | /* Rechain finished requests to final queue */ |
8e09f215 | 1165 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1166 | } |
1167 | } | |
1168 | ||
1da177e4 | 1169 | /* |
8e09f215 SW |
1170 | * the cqrs from the final queue are returned to the upper layer |
1171 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1172 | */ |
8e09f215 SW |
1173 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1174 | struct list_head *final_queue) | |
1da177e4 | 1175 | { |
8e09f215 | 1176 | struct list_head *l, *n; |
1da177e4 | 1177 | struct dasd_ccw_req *cqr; |
03513bcc | 1178 | struct dasd_block *block; |
c80ee724 SH |
1179 | void (*callback)(struct dasd_ccw_req *, void *data); |
1180 | void *callback_data; | |
f24acd45 | 1181 | |
8e09f215 SW |
1182 | list_for_each_safe(l, n, final_queue) { |
1183 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1184 | list_del_init(&cqr->devlist); | |
03513bcc | 1185 | block = cqr->block; |
c80ee724 SH |
1186 | callback = cqr->callback; |
1187 | callback_data = cqr->callback_data; | |
03513bcc SW |
1188 | if (block) |
1189 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1190 | switch (cqr->status) { |
1191 | case DASD_CQR_SUCCESS: | |
1192 | cqr->status = DASD_CQR_DONE; | |
1193 | break; | |
1194 | case DASD_CQR_ERROR: | |
1195 | cqr->status = DASD_CQR_NEED_ERP; | |
1196 | break; | |
1197 | case DASD_CQR_CLEARED: | |
1198 | cqr->status = DASD_CQR_TERMINATED; | |
1199 | break; | |
1200 | default: | |
1201 | DEV_MESSAGE(KERN_ERR, device, | |
1202 | "wrong cqr status in __dasd_process_final_queue " | |
1203 | "for cqr %p, status %x", | |
1204 | cqr, cqr->status); | |
1205 | BUG(); | |
1da177e4 | 1206 | } |
8e09f215 | 1207 | if (cqr->callback != NULL) |
c80ee724 | 1208 | (callback)(cqr, callback_data); |
03513bcc SW |
1209 | if (block) |
1210 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1211 | } |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * Take a look at the first request on the ccw queue and check | |
1216 | * if it reached its expire time. If so, terminate the IO. | |
1217 | */ | |
8e09f215 | 1218 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1219 | { |
1220 | struct dasd_ccw_req *cqr; | |
1221 | ||
1222 | if (list_empty(&device->ccw_queue)) | |
1223 | return; | |
8e09f215 | 1224 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1225 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1226 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1227 | if (device->discipline->term_IO(cqr) != 0) { | |
1228 | /* Hmpf, try again in 5 sec */ | |
29145a6c HH |
1229 | DEV_MESSAGE(KERN_ERR, device, |
1230 | "internal error - timeout (%is) expired " | |
1231 | "for cqr %p, termination failed, " | |
1232 | "retrying in 5s", | |
1233 | (cqr->expires/HZ), cqr); | |
7dc1da9f SH |
1234 | cqr->expires += 5*HZ; |
1235 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1236 | } else { |
8f61701b HH |
1237 | DEV_MESSAGE(KERN_ERR, device, |
1238 | "internal error - timeout (%is) expired " | |
1239 | "for cqr %p (%i retries left)", | |
1240 | (cqr->expires/HZ), cqr, cqr->retries); | |
1da177e4 LT |
1241 | } |
1242 | } | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Take a look at the first request on the ccw queue and check | |
1247 | * if it needs to be started. | |
1248 | */ | |
8e09f215 | 1249 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1250 | { |
1251 | struct dasd_ccw_req *cqr; | |
1252 | int rc; | |
1253 | ||
1254 | if (list_empty(&device->ccw_queue)) | |
1255 | return; | |
8e09f215 | 1256 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1257 | if (cqr->status != DASD_CQR_QUEUED) |
1258 | return; | |
8e09f215 SW |
1259 | /* when device is stopped, return request to previous layer */ |
1260 | if (device->stopped) { | |
1261 | cqr->status = DASD_CQR_CLEARED; | |
1262 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1263 | return; |
1c01b8a5 | 1264 | } |
25ee4cf8 PO |
1265 | |
1266 | rc = device->discipline->start_IO(cqr); | |
1267 | if (rc == 0) | |
8e09f215 | 1268 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1269 | else if (rc == -EACCES) { |
8e09f215 | 1270 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1271 | } else |
1272 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1273 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1274 | } |
1275 | ||
1da177e4 | 1276 | /* |
8e09f215 SW |
1277 | * Go through all request on the dasd_device request queue, |
1278 | * terminate them on the cdev if necessary, and return them to the | |
1279 | * submitting layer via callback. | |
1280 | * Note: | |
1281 | * Make sure that all 'submitting layers' still exist when | |
1282 | * this function is called!. In other words, when 'device' is a base | |
1283 | * device then all block layer requests must have been removed before | |
1284 | * via dasd_flush_block_queue. | |
1da177e4 | 1285 | */ |
8e09f215 | 1286 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1287 | { |
8e09f215 SW |
1288 | struct dasd_ccw_req *cqr, *n; |
1289 | int rc; | |
1da177e4 | 1290 | struct list_head flush_queue; |
1da177e4 LT |
1291 | |
1292 | INIT_LIST_HEAD(&flush_queue); | |
1293 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1294 | rc = 0; |
8e09f215 | 1295 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1296 | /* Check status and move request to flush_queue */ |
1297 | switch (cqr->status) { | |
1298 | case DASD_CQR_IN_IO: | |
1299 | rc = device->discipline->term_IO(cqr); | |
1300 | if (rc) { | |
1301 | /* unable to terminate requeust */ | |
1302 | DEV_MESSAGE(KERN_ERR, device, | |
1303 | "dasd flush ccw_queue is unable " | |
1304 | " to terminate request %p", | |
1305 | cqr); | |
1306 | /* stop flush processing */ | |
1307 | goto finished; | |
1308 | } | |
1309 | break; | |
1310 | case DASD_CQR_QUEUED: | |
1da177e4 | 1311 | cqr->stopclk = get_clock(); |
8e09f215 | 1312 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1313 | break; |
8e09f215 | 1314 | default: /* no need to modify the others */ |
8f61701b HH |
1315 | break; |
1316 | } | |
8e09f215 | 1317 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1318 | } |
8f61701b HH |
1319 | finished: |
1320 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1321 | /* |
1322 | * After this point all requests must be in state CLEAR_PENDING, | |
1323 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1324 | * one of the others. | |
1325 | */ | |
1326 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1327 | wait_event(dasd_flush_wq, | |
1328 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1329 | /* | |
1330 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1331 | * and call the callback function of flushed requests | |
1332 | */ | |
1333 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1334 | return rc; |
1da177e4 LT |
1335 | } |
1336 | ||
1337 | /* | |
1338 | * Acquire the device lock and process queues for the device. | |
1339 | */ | |
8e09f215 | 1340 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1341 | { |
1342 | struct list_head final_queue; | |
1da177e4 LT |
1343 | |
1344 | atomic_set (&device->tasklet_scheduled, 0); | |
1345 | INIT_LIST_HEAD(&final_queue); | |
1346 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1347 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1348 | __dasd_device_check_expire(device); |
1349 | /* find final requests on ccw queue */ | |
1350 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1351 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1352 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1353 | __dasd_device_process_final_queue(device, &final_queue); |
1354 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1355 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1356 | __dasd_device_start_head(device); |
1357 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1358 | dasd_put_device(device); |
1359 | } | |
1360 | ||
1361 | /* | |
1362 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1363 | */ | |
8e09f215 | 1364 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1365 | { |
1366 | /* Protect against rescheduling. */ | |
973bd993 | 1367 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1368 | return; |
1369 | dasd_get_device(device); | |
1370 | tasklet_hi_schedule(&device->tasklet); | |
1371 | } | |
1372 | ||
1373 | /* | |
8e09f215 SW |
1374 | * Queue a request to the head of the device ccw_queue. |
1375 | * Start the I/O if possible. | |
1da177e4 | 1376 | */ |
8e09f215 | 1377 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1378 | { |
1379 | struct dasd_device *device; | |
1380 | unsigned long flags; | |
1381 | ||
8e09f215 | 1382 | device = cqr->startdev; |
1da177e4 | 1383 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1384 | cqr->status = DASD_CQR_QUEUED; |
1385 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1386 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1387 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1388 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1389 | } | |
1390 | ||
1391 | /* | |
8e09f215 SW |
1392 | * Queue a request to the tail of the device ccw_queue. |
1393 | * Start the I/O if possible. | |
1da177e4 | 1394 | */ |
8e09f215 | 1395 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1396 | { |
1397 | struct dasd_device *device; | |
1398 | unsigned long flags; | |
1399 | ||
8e09f215 | 1400 | device = cqr->startdev; |
1da177e4 | 1401 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1402 | cqr->status = DASD_CQR_QUEUED; |
1403 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1404 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1405 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1406 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1407 | } | |
1408 | ||
1409 | /* | |
8e09f215 | 1410 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1411 | */ |
8e09f215 | 1412 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 LT |
1413 | { |
1414 | wake_up((wait_queue_head_t *) data); | |
1415 | } | |
1416 | ||
8e09f215 | 1417 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1418 | { |
1419 | struct dasd_device *device; | |
1420 | int rc; | |
1421 | ||
8e09f215 | 1422 | device = cqr->startdev; |
1da177e4 | 1423 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
c2ba444d | 1424 | rc = ((cqr->status == DASD_CQR_DONE || |
8e09f215 SW |
1425 | cqr->status == DASD_CQR_NEED_ERP || |
1426 | cqr->status == DASD_CQR_TERMINATED) && | |
1427 | list_empty(&cqr->devlist)); | |
1da177e4 LT |
1428 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1429 | return rc; | |
1430 | } | |
1431 | ||
1432 | /* | |
8e09f215 SW |
1433 | * Queue a request to the tail of the device ccw_queue and wait for |
1434 | * it's completion. | |
1da177e4 | 1435 | */ |
8e09f215 | 1436 | int dasd_sleep_on(struct dasd_ccw_req *cqr) |
1da177e4 | 1437 | { |
1da177e4 LT |
1438 | struct dasd_device *device; |
1439 | int rc; | |
138c014d | 1440 | |
8e09f215 | 1441 | device = cqr->startdev; |
138c014d | 1442 | |
1da177e4 | 1443 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1444 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1445 | dasd_add_request_tail(cqr); |
c80ee724 | 1446 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1447 | |
1da177e4 | 1448 | /* Request status is either done or failed. */ |
8e09f215 | 1449 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1450 | return rc; |
1451 | } | |
1452 | ||
1453 | /* | |
8e09f215 SW |
1454 | * Queue a request to the tail of the device ccw_queue and wait |
1455 | * interruptible for it's completion. | |
1da177e4 | 1456 | */ |
8e09f215 | 1457 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1458 | { |
1da177e4 | 1459 | struct dasd_device *device; |
8e09f215 | 1460 | int rc; |
1da177e4 | 1461 | |
8e09f215 | 1462 | device = cqr->startdev; |
1da177e4 | 1463 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1464 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1465 | dasd_add_request_tail(cqr); |
c80ee724 | 1466 | rc = wait_event_interruptible(generic_waitq, _wait_for_wakeup(cqr)); |
8e09f215 SW |
1467 | if (rc == -ERESTARTSYS) { |
1468 | dasd_cancel_req(cqr); | |
1469 | /* wait (non-interruptible) for final status */ | |
c80ee724 | 1470 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
1da177e4 | 1471 | } |
8e09f215 | 1472 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1473 | return rc; |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1478 | * for eckd devices) the currently running request has to be terminated | |
1479 | * and be put back to status queued, before the special request is added | |
1480 | * to the head of the queue. Then the special request is waited on normally. | |
1481 | */ | |
8e09f215 | 1482 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1483 | { |
1484 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1485 | |
1486 | if (list_empty(&device->ccw_queue)) | |
1487 | return 0; | |
8e09f215 | 1488 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1489 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1490 | } |
1491 | ||
8e09f215 | 1492 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1493 | { |
1da177e4 LT |
1494 | struct dasd_device *device; |
1495 | int rc; | |
138c014d | 1496 | |
8e09f215 | 1497 | device = cqr->startdev; |
1da177e4 LT |
1498 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1499 | rc = _dasd_term_running_cqr(device); | |
1500 | if (rc) { | |
1501 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1502 | return rc; | |
1503 | } | |
138c014d | 1504 | |
1da177e4 | 1505 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1506 | cqr->callback_data = (void *) &generic_waitq; |
1da177e4 | 1507 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1508 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1509 | |
1da177e4 | 1510 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1511 | dasd_schedule_device_bh(device); |
138c014d | 1512 | |
1da177e4 LT |
1513 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1514 | ||
c80ee724 | 1515 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1516 | |
1da177e4 | 1517 | /* Request status is either done or failed. */ |
8e09f215 | 1518 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1519 | return rc; |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * Cancels a request that was started with dasd_sleep_on_req. | |
1524 | * This is useful to timeout requests. The request will be | |
1525 | * terminated if it is currently in i/o. | |
1526 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1527 | * 0 if there was no need to terminate the request (not started yet) |
1528 | * negative error code if termination failed | |
1529 | * Cancellation of a request is an asynchronous operation! The calling | |
1530 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1531 | */ |
8e09f215 | 1532 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1533 | { |
8e09f215 | 1534 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1535 | unsigned long flags; |
1536 | int rc; | |
1537 | ||
1538 | rc = 0; | |
1539 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1540 | switch (cqr->status) { | |
1541 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1542 | /* request was not started - just set to cleared */ |
1543 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1544 | break; |
1545 | case DASD_CQR_IN_IO: | |
1546 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1547 | rc = device->discipline->term_IO(cqr); |
1548 | if (rc) { | |
1549 | DEV_MESSAGE(KERN_ERR, device, | |
1550 | "dasd_cancel_req is unable " | |
1551 | " to terminate request %p, rc = %d", | |
1552 | cqr, rc); | |
1553 | } else { | |
1554 | cqr->stopclk = get_clock(); | |
1555 | rc = 1; | |
1556 | } | |
1da177e4 | 1557 | break; |
8e09f215 | 1558 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1559 | break; |
8e09f215 SW |
1560 | } |
1561 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1562 | dasd_schedule_device_bh(device); | |
1563 | return rc; | |
1564 | } | |
1565 | ||
1566 | ||
1567 | /* | |
1568 | * SECTION: Operations of the dasd_block layer. | |
1569 | */ | |
1570 | ||
1571 | /* | |
1572 | * Timeout function for dasd_block. This is used when the block layer | |
1573 | * is waiting for something that may not come reliably, (e.g. a state | |
1574 | * change interrupt) | |
1575 | */ | |
1576 | static void dasd_block_timeout(unsigned long ptr) | |
1577 | { | |
1578 | unsigned long flags; | |
1579 | struct dasd_block *block; | |
1580 | ||
1581 | block = (struct dasd_block *) ptr; | |
1582 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1583 | /* re-activate request queue */ | |
1584 | block->base->stopped &= ~DASD_STOPPED_PENDING; | |
1585 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); | |
1586 | dasd_schedule_block_bh(block); | |
1587 | } | |
1588 | ||
1589 | /* | |
1590 | * Setup timeout for a dasd_block in jiffies. | |
1591 | */ | |
1592 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1593 | { | |
48cae885 SW |
1594 | if (expires == 0) |
1595 | del_timer(&block->timer); | |
1596 | else | |
1597 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 SW |
1598 | } |
1599 | ||
1600 | /* | |
1601 | * Clear timeout for a dasd_block. | |
1602 | */ | |
1603 | void dasd_block_clear_timer(struct dasd_block *block) | |
1604 | { | |
48cae885 | 1605 | del_timer(&block->timer); |
8e09f215 SW |
1606 | } |
1607 | ||
1608 | /* | |
1609 | * posts the buffer_cache about a finalized request | |
1610 | */ | |
4c4e2148 | 1611 | static inline void dasd_end_request(struct request *req, int error) |
8e09f215 | 1612 | { |
4c4e2148 | 1613 | if (__blk_end_request(req, error, blk_rq_bytes(req))) |
1da177e4 | 1614 | BUG(); |
8e09f215 SW |
1615 | } |
1616 | ||
1617 | /* | |
1618 | * Process finished error recovery ccw. | |
1619 | */ | |
1620 | static inline void __dasd_block_process_erp(struct dasd_block *block, | |
1621 | struct dasd_ccw_req *cqr) | |
1622 | { | |
1623 | dasd_erp_fn_t erp_fn; | |
1624 | struct dasd_device *device = block->base; | |
1625 | ||
1626 | if (cqr->status == DASD_CQR_DONE) | |
1627 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1628 | else | |
1629 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1630 | erp_fn = device->discipline->erp_postaction(cqr); | |
1631 | erp_fn(cqr); | |
1632 | } | |
1da177e4 | 1633 | |
8e09f215 SW |
1634 | /* |
1635 | * Fetch requests from the block device queue. | |
1636 | */ | |
1637 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1638 | { | |
1639 | struct request_queue *queue; | |
1640 | struct request *req; | |
1641 | struct dasd_ccw_req *cqr; | |
1642 | struct dasd_device *basedev; | |
1643 | unsigned long flags; | |
1644 | queue = block->request_queue; | |
1645 | basedev = block->base; | |
1646 | /* No queue ? Then there is nothing to do. */ | |
1647 | if (queue == NULL) | |
1648 | return; | |
1649 | ||
1650 | /* | |
1651 | * We requeue request from the block device queue to the ccw | |
1652 | * queue only in two states. In state DASD_STATE_READY the | |
1653 | * partition detection is done and we need to requeue requests | |
1654 | * for that. State DASD_STATE_ONLINE is normal block device | |
1655 | * operation. | |
1656 | */ | |
1657 | if (basedev->state < DASD_STATE_READY) | |
1658 | return; | |
1659 | /* Now we try to fetch requests from the request queue */ | |
1660 | while (!blk_queue_plugged(queue) && | |
1661 | elv_next_request(queue)) { | |
1662 | ||
1663 | req = elv_next_request(queue); | |
1664 | ||
1665 | if (basedev->features & DASD_FEATURE_READONLY && | |
1666 | rq_data_dir(req) == WRITE) { | |
1667 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1668 | "Rejecting write request %p", | |
1669 | req); | |
1670 | blkdev_dequeue_request(req); | |
4c4e2148 | 1671 | dasd_end_request(req, -EIO); |
8e09f215 SW |
1672 | continue; |
1673 | } | |
1674 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1675 | if (IS_ERR(cqr)) { | |
1676 | if (PTR_ERR(cqr) == -EBUSY) | |
1677 | break; /* normal end condition */ | |
1678 | if (PTR_ERR(cqr) == -ENOMEM) | |
1679 | break; /* terminate request queue loop */ | |
1680 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1681 | /* | |
1682 | * The current request cannot be build right | |
1683 | * now, we have to try later. If this request | |
1684 | * is the head-of-queue we stop the device | |
1685 | * for 1/2 second. | |
1686 | */ | |
1687 | if (!list_empty(&block->ccw_queue)) | |
1688 | break; | |
1689 | spin_lock_irqsave(get_ccwdev_lock(basedev->cdev), flags); | |
1690 | basedev->stopped |= DASD_STOPPED_PENDING; | |
1691 | spin_unlock_irqrestore(get_ccwdev_lock(basedev->cdev), flags); | |
1692 | dasd_block_set_timer(block, HZ/2); | |
1693 | break; | |
1694 | } | |
1695 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1696 | "CCW creation failed (rc=%ld) " | |
1697 | "on request %p", | |
1698 | PTR_ERR(cqr), req); | |
1699 | blkdev_dequeue_request(req); | |
4c4e2148 | 1700 | dasd_end_request(req, -EIO); |
8e09f215 SW |
1701 | continue; |
1702 | } | |
1703 | /* | |
1704 | * Note: callback is set to dasd_return_cqr_cb in | |
1705 | * __dasd_block_start_head to cover erp requests as well | |
1706 | */ | |
1707 | cqr->callback_data = (void *) req; | |
1708 | cqr->status = DASD_CQR_FILLED; | |
1709 | blkdev_dequeue_request(req); | |
1710 | list_add_tail(&cqr->blocklist, &block->ccw_queue); | |
1711 | dasd_profile_start(block, cqr, req); | |
1712 | } | |
1713 | } | |
1714 | ||
1715 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1716 | { | |
1717 | struct request *req; | |
1718 | int status; | |
4c4e2148 | 1719 | int error = 0; |
8e09f215 SW |
1720 | |
1721 | req = (struct request *) cqr->callback_data; | |
1722 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1723 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1724 | if (status <= 0) |
1725 | error = status ? status : -EIO; | |
1726 | dasd_end_request(req, error); | |
8e09f215 SW |
1727 | } |
1728 | ||
1729 | /* | |
1730 | * Process ccw request queue. | |
1731 | */ | |
1732 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1733 | struct list_head *final_queue) | |
1734 | { | |
1735 | struct list_head *l, *n; | |
1736 | struct dasd_ccw_req *cqr; | |
1737 | dasd_erp_fn_t erp_fn; | |
1738 | unsigned long flags; | |
1739 | struct dasd_device *base = block->base; | |
1740 | ||
1741 | restart: | |
1742 | /* Process request with final status. */ | |
1743 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1744 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1745 | if (cqr->status != DASD_CQR_DONE && | |
1746 | cqr->status != DASD_CQR_FAILED && | |
1747 | cqr->status != DASD_CQR_NEED_ERP && | |
1748 | cqr->status != DASD_CQR_TERMINATED) | |
1749 | continue; | |
1750 | ||
1751 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1752 | base->discipline->handle_terminated_request(cqr); | |
1753 | goto restart; | |
1754 | } | |
1755 | ||
1756 | /* Process requests that may be recovered */ | |
1757 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 SH |
1758 | erp_fn = base->discipline->erp_action(cqr); |
1759 | erp_fn(cqr); | |
8e09f215 SW |
1760 | goto restart; |
1761 | } | |
1762 | ||
a9cffb22 SH |
1763 | /* log sense for fatal error */ |
1764 | if (cqr->status == DASD_CQR_FAILED) { | |
1765 | dasd_log_sense(cqr, &cqr->irb); | |
1766 | } | |
1767 | ||
8e09f215 SW |
1768 | /* First of all call extended error reporting. */ |
1769 | if (dasd_eer_enabled(base) && | |
1770 | cqr->status == DASD_CQR_FAILED) { | |
1771 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1772 | ||
1773 | /* restart request */ | |
1774 | cqr->status = DASD_CQR_FILLED; | |
1775 | cqr->retries = 255; | |
1776 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
1777 | base->stopped |= DASD_STOPPED_QUIESCE; | |
1778 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), | |
1779 | flags); | |
1780 | goto restart; | |
1781 | } | |
1782 | ||
1783 | /* Process finished ERP request. */ | |
1784 | if (cqr->refers) { | |
1785 | __dasd_block_process_erp(block, cqr); | |
1786 | goto restart; | |
1787 | } | |
1788 | ||
1789 | /* Rechain finished requests to final queue */ | |
1790 | cqr->endclk = get_clock(); | |
1791 | list_move_tail(&cqr->blocklist, final_queue); | |
1792 | } | |
1793 | } | |
1794 | ||
1795 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1796 | { | |
1797 | dasd_schedule_block_bh(cqr->block); | |
1798 | } | |
1799 | ||
1800 | static void __dasd_block_start_head(struct dasd_block *block) | |
1801 | { | |
1802 | struct dasd_ccw_req *cqr; | |
1803 | ||
1804 | if (list_empty(&block->ccw_queue)) | |
1805 | return; | |
1806 | /* We allways begin with the first requests on the queue, as some | |
1807 | * of previously started requests have to be enqueued on a | |
1808 | * dasd_device again for error recovery. | |
1809 | */ | |
1810 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1811 | if (cqr->status != DASD_CQR_FILLED) | |
1812 | continue; | |
1813 | /* Non-temporary stop condition will trigger fail fast */ | |
1814 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1815 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1816 | (!dasd_eer_enabled(block->base))) { | |
1817 | cqr->status = DASD_CQR_FAILED; | |
1818 | dasd_schedule_block_bh(block); | |
1819 | continue; | |
1820 | } | |
1821 | /* Don't try to start requests if device is stopped */ | |
1822 | if (block->base->stopped) | |
1823 | return; | |
1824 | ||
1825 | /* just a fail safe check, should not happen */ | |
1826 | if (!cqr->startdev) | |
1827 | cqr->startdev = block->base; | |
1828 | ||
1829 | /* make sure that the requests we submit find their way back */ | |
1830 | cqr->callback = dasd_return_cqr_cb; | |
1831 | ||
1832 | dasd_add_request_tail(cqr); | |
1833 | } | |
1834 | } | |
1835 | ||
1836 | /* | |
1837 | * Central dasd_block layer routine. Takes requests from the generic | |
1838 | * block layer request queue, creates ccw requests, enqueues them on | |
1839 | * a dasd_device and processes ccw requests that have been returned. | |
1840 | */ | |
1841 | static void dasd_block_tasklet(struct dasd_block *block) | |
1842 | { | |
1843 | struct list_head final_queue; | |
1844 | struct list_head *l, *n; | |
1845 | struct dasd_ccw_req *cqr; | |
1846 | ||
1847 | atomic_set(&block->tasklet_scheduled, 0); | |
1848 | INIT_LIST_HEAD(&final_queue); | |
1849 | spin_lock(&block->queue_lock); | |
1850 | /* Finish off requests on ccw queue */ | |
1851 | __dasd_process_block_ccw_queue(block, &final_queue); | |
1852 | spin_unlock(&block->queue_lock); | |
1853 | /* Now call the callback function of requests with final status */ | |
1854 | spin_lock_irq(&block->request_queue_lock); | |
1855 | list_for_each_safe(l, n, &final_queue) { | |
1856 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1857 | list_del_init(&cqr->blocklist); | |
1858 | __dasd_cleanup_cqr(cqr); | |
1859 | } | |
1860 | spin_lock(&block->queue_lock); | |
1861 | /* Get new request from the block device request queue */ | |
1862 | __dasd_process_request_queue(block); | |
1863 | /* Now check if the head of the ccw queue needs to be started. */ | |
1864 | __dasd_block_start_head(block); | |
1865 | spin_unlock(&block->queue_lock); | |
1866 | spin_unlock_irq(&block->request_queue_lock); | |
1867 | dasd_put_device(block->base); | |
1868 | } | |
1869 | ||
1870 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
1871 | { | |
1872 | wake_up(&dasd_flush_wq); | |
1873 | } | |
1874 | ||
1875 | /* | |
1876 | * Go through all request on the dasd_block request queue, cancel them | |
1877 | * on the respective dasd_device, and return them to the generic | |
1878 | * block layer. | |
1879 | */ | |
1880 | static int dasd_flush_block_queue(struct dasd_block *block) | |
1881 | { | |
1882 | struct dasd_ccw_req *cqr, *n; | |
1883 | int rc, i; | |
1884 | struct list_head flush_queue; | |
1885 | ||
1886 | INIT_LIST_HEAD(&flush_queue); | |
1887 | spin_lock_bh(&block->queue_lock); | |
1888 | rc = 0; | |
1889 | restart: | |
1890 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
1891 | /* if this request currently owned by a dasd_device cancel it */ | |
1892 | if (cqr->status >= DASD_CQR_QUEUED) | |
1893 | rc = dasd_cancel_req(cqr); | |
1894 | if (rc < 0) | |
1895 | break; | |
1896 | /* Rechain request (including erp chain) so it won't be | |
1897 | * touched by the dasd_block_tasklet anymore. | |
1898 | * Replace the callback so we notice when the request | |
1899 | * is returned from the dasd_device layer. | |
1900 | */ | |
1901 | cqr->callback = _dasd_wake_block_flush_cb; | |
1902 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
1903 | list_move_tail(&cqr->blocklist, &flush_queue); | |
1904 | if (i > 1) | |
1905 | /* moved more than one request - need to restart */ | |
1906 | goto restart; | |
1907 | } | |
1908 | spin_unlock_bh(&block->queue_lock); | |
1909 | /* Now call the callback function of flushed requests */ | |
1910 | restart_cb: | |
1911 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
1912 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
1913 | /* Process finished ERP request. */ | |
1914 | if (cqr->refers) { | |
0cd4bd47 | 1915 | spin_lock_bh(&block->queue_lock); |
8e09f215 | 1916 | __dasd_block_process_erp(block, cqr); |
0cd4bd47 | 1917 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
1918 | /* restart list_for_xx loop since dasd_process_erp |
1919 | * might remove multiple elements */ | |
1920 | goto restart_cb; | |
1921 | } | |
1922 | /* call the callback function */ | |
0cd4bd47 | 1923 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
1924 | cqr->endclk = get_clock(); |
1925 | list_del_init(&cqr->blocklist); | |
1926 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 1927 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 1928 | } |
1da177e4 LT |
1929 | return rc; |
1930 | } | |
1931 | ||
1932 | /* | |
8e09f215 SW |
1933 | * Schedules a call to dasd_tasklet over the device tasklet. |
1934 | */ | |
1935 | void dasd_schedule_block_bh(struct dasd_block *block) | |
1936 | { | |
1937 | /* Protect against rescheduling. */ | |
1938 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
1939 | return; | |
1940 | /* life cycle of block is bound to it's base device */ | |
1941 | dasd_get_device(block->base); | |
1942 | tasklet_hi_schedule(&block->tasklet); | |
1943 | } | |
1944 | ||
1945 | ||
1946 | /* | |
1947 | * SECTION: external block device operations | |
1948 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
1949 | */ |
1950 | ||
1951 | /* | |
1952 | * Dasd request queue function. Called from ll_rw_blk.c | |
1953 | */ | |
8e09f215 | 1954 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 1955 | { |
8e09f215 | 1956 | struct dasd_block *block; |
1da177e4 | 1957 | |
8e09f215 SW |
1958 | block = queue->queuedata; |
1959 | spin_lock(&block->queue_lock); | |
1da177e4 | 1960 | /* Get new request from the block device request queue */ |
8e09f215 | 1961 | __dasd_process_request_queue(block); |
1da177e4 | 1962 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1963 | __dasd_block_start_head(block); |
1964 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
1965 | } |
1966 | ||
1967 | /* | |
1968 | * Allocate and initialize request queue and default I/O scheduler. | |
1969 | */ | |
8e09f215 | 1970 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
1971 | { |
1972 | int rc; | |
1973 | ||
8e09f215 SW |
1974 | block->request_queue = blk_init_queue(do_dasd_request, |
1975 | &block->request_queue_lock); | |
1976 | if (block->request_queue == NULL) | |
1da177e4 LT |
1977 | return -ENOMEM; |
1978 | ||
8e09f215 | 1979 | block->request_queue->queuedata = block; |
1da177e4 | 1980 | |
8e09f215 | 1981 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 1982 | block->request_queue->elevator = NULL; |
8e09f215 | 1983 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 1984 | if (rc) { |
8e09f215 | 1985 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
1986 | return rc; |
1987 | } | |
1988 | return 0; | |
1989 | } | |
1990 | ||
1991 | /* | |
1992 | * Allocate and initialize request queue. | |
1993 | */ | |
8e09f215 | 1994 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
1995 | { |
1996 | int max; | |
1997 | ||
8e09f215 SW |
1998 | blk_queue_hardsect_size(block->request_queue, block->bp_block); |
1999 | max = block->base->discipline->max_blocks << block->s2b_shift; | |
2000 | blk_queue_max_sectors(block->request_queue, max); | |
2001 | blk_queue_max_phys_segments(block->request_queue, -1L); | |
2002 | blk_queue_max_hw_segments(block->request_queue, -1L); | |
f3eb5384 SW |
2003 | /* with page sized segments we can translate each segement into |
2004 | * one idaw/tidaw | |
2005 | */ | |
2006 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
2007 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
8e09f215 | 2008 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); |
1da177e4 LT |
2009 | } |
2010 | ||
2011 | /* | |
2012 | * Deactivate and free request queue. | |
2013 | */ | |
8e09f215 | 2014 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2015 | { |
8e09f215 SW |
2016 | if (block->request_queue) { |
2017 | blk_cleanup_queue(block->request_queue); | |
2018 | block->request_queue = NULL; | |
1da177e4 LT |
2019 | } |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Flush request on the request queue. | |
2024 | */ | |
8e09f215 | 2025 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2026 | { |
2027 | struct request *req; | |
2028 | ||
8e09f215 | 2029 | if (!block->request_queue) |
1da177e4 | 2030 | return; |
138c014d | 2031 | |
8e09f215 SW |
2032 | spin_lock_irq(&block->request_queue_lock); |
2033 | while ((req = elv_next_request(block->request_queue))) { | |
1da177e4 | 2034 | blkdev_dequeue_request(req); |
4c4e2148 | 2035 | dasd_end_request(req, -EIO); |
1da177e4 | 2036 | } |
8e09f215 | 2037 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2038 | } |
2039 | ||
57a7c0bc | 2040 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2041 | { |
57a7c0bc | 2042 | struct dasd_block *block = bdev->bd_disk->private_data; |
8e09f215 | 2043 | struct dasd_device *base = block->base; |
1da177e4 LT |
2044 | int rc; |
2045 | ||
8e09f215 SW |
2046 | atomic_inc(&block->open_count); |
2047 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2048 | rc = -ENODEV; |
2049 | goto unlock; | |
2050 | } | |
2051 | ||
8e09f215 | 2052 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2053 | rc = -EINVAL; |
2054 | goto unlock; | |
2055 | } | |
2056 | ||
2057 | if (dasd_probeonly) { | |
8e09f215 | 2058 | DEV_MESSAGE(KERN_INFO, base, "%s", |
1da177e4 LT |
2059 | "No access to device due to probeonly mode"); |
2060 | rc = -EPERM; | |
2061 | goto out; | |
2062 | } | |
2063 | ||
8e09f215 SW |
2064 | if (base->state <= DASD_STATE_BASIC) { |
2065 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2066 | " Cannot open unrecognized device"); |
2067 | rc = -ENODEV; | |
2068 | goto out; | |
2069 | } | |
2070 | ||
2071 | return 0; | |
2072 | ||
2073 | out: | |
8e09f215 | 2074 | module_put(base->discipline->owner); |
1da177e4 | 2075 | unlock: |
8e09f215 | 2076 | atomic_dec(&block->open_count); |
1da177e4 LT |
2077 | return rc; |
2078 | } | |
2079 | ||
57a7c0bc | 2080 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2081 | { |
8e09f215 | 2082 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2083 | |
8e09f215 SW |
2084 | atomic_dec(&block->open_count); |
2085 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2086 | return 0; |
2087 | } | |
2088 | ||
a885c8c4 CH |
2089 | /* |
2090 | * Return disk geometry. | |
2091 | */ | |
8e09f215 | 2092 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2093 | { |
8e09f215 SW |
2094 | struct dasd_block *block; |
2095 | struct dasd_device *base; | |
a885c8c4 | 2096 | |
8e09f215 SW |
2097 | block = bdev->bd_disk->private_data; |
2098 | base = block->base; | |
2099 | if (!block) | |
a885c8c4 CH |
2100 | return -ENODEV; |
2101 | ||
8e09f215 SW |
2102 | if (!base->discipline || |
2103 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2104 | return -EINVAL; |
2105 | ||
8e09f215 SW |
2106 | base->discipline->fill_geometry(block, geo); |
2107 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2108 | return 0; |
2109 | } | |
2110 | ||
1da177e4 LT |
2111 | struct block_device_operations |
2112 | dasd_device_operations = { | |
2113 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2114 | .open = dasd_open, |
2115 | .release = dasd_release, | |
0000d031 HC |
2116 | .ioctl = dasd_ioctl, |
2117 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 2118 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2119 | }; |
2120 | ||
8e09f215 SW |
2121 | /******************************************************************************* |
2122 | * end of block device operations | |
2123 | */ | |
1da177e4 LT |
2124 | |
2125 | static void | |
2126 | dasd_exit(void) | |
2127 | { | |
2128 | #ifdef CONFIG_PROC_FS | |
2129 | dasd_proc_exit(); | |
2130 | #endif | |
20c64468 | 2131 | dasd_eer_exit(); |
6bb0e010 HH |
2132 | if (dasd_page_cache != NULL) { |
2133 | kmem_cache_destroy(dasd_page_cache); | |
2134 | dasd_page_cache = NULL; | |
2135 | } | |
1da177e4 LT |
2136 | dasd_gendisk_exit(); |
2137 | dasd_devmap_exit(); | |
1da177e4 LT |
2138 | if (dasd_debug_area != NULL) { |
2139 | debug_unregister(dasd_debug_area); | |
2140 | dasd_debug_area = NULL; | |
2141 | } | |
2142 | } | |
2143 | ||
2144 | /* | |
2145 | * SECTION: common functions for ccw_driver use | |
2146 | */ | |
2147 | ||
1c01b8a5 HH |
2148 | /* |
2149 | * Initial attempt at a probe function. this can be simplified once | |
2150 | * the other detection code is gone. | |
2151 | */ | |
8e09f215 SW |
2152 | int dasd_generic_probe(struct ccw_device *cdev, |
2153 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2154 | { |
2155 | int ret; | |
2156 | ||
40545573 HH |
2157 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
2158 | if (ret) { | |
2159 | printk(KERN_WARNING | |
2160 | "dasd_generic_probe: could not set ccw-device options " | |
2a0217d5 | 2161 | "for %s\n", dev_name(&cdev->dev)); |
40545573 HH |
2162 | return ret; |
2163 | } | |
1da177e4 LT |
2164 | ret = dasd_add_sysfs_files(cdev); |
2165 | if (ret) { | |
2166 | printk(KERN_WARNING | |
2167 | "dasd_generic_probe: could not add sysfs entries " | |
2a0217d5 | 2168 | "for %s\n", dev_name(&cdev->dev)); |
40545573 | 2169 | return ret; |
1da177e4 | 2170 | } |
40545573 | 2171 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2172 | |
40545573 HH |
2173 | /* |
2174 | * Automatically online either all dasd devices (dasd_autodetect) | |
2175 | * or all devices specified with dasd= parameters during | |
2176 | * initial probe. | |
2177 | */ | |
2178 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2179 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
40545573 HH |
2180 | ret = ccw_device_set_online(cdev); |
2181 | if (ret) | |
2182 | printk(KERN_WARNING | |
de3e0da1 SH |
2183 | "dasd_generic_probe: could not initially " |
2184 | "online ccw-device %s; return code: %d\n", | |
2a0217d5 | 2185 | dev_name(&cdev->dev), ret); |
de3e0da1 | 2186 | return 0; |
1da177e4 LT |
2187 | } |
2188 | ||
1c01b8a5 HH |
2189 | /* |
2190 | * This will one day be called from a global not_oper handler. | |
2191 | * It is also used by driver_unregister during module unload. | |
2192 | */ | |
8e09f215 | 2193 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2194 | { |
2195 | struct dasd_device *device; | |
8e09f215 | 2196 | struct dasd_block *block; |
1da177e4 | 2197 | |
59afda78 HH |
2198 | cdev->handler = NULL; |
2199 | ||
1da177e4 LT |
2200 | dasd_remove_sysfs_files(cdev); |
2201 | device = dasd_device_from_cdev(cdev); | |
2202 | if (IS_ERR(device)) | |
2203 | return; | |
2204 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2205 | /* Already doing offline processing */ | |
2206 | dasd_put_device(device); | |
2207 | return; | |
2208 | } | |
2209 | /* | |
2210 | * This device is removed unconditionally. Set offline | |
2211 | * flag to prevent dasd_open from opening it while it is | |
2212 | * no quite down yet. | |
2213 | */ | |
2214 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2215 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2216 | block = device->block; |
2217 | device->block = NULL; | |
1da177e4 | 2218 | dasd_delete_device(device); |
8e09f215 SW |
2219 | /* |
2220 | * life cycle of block is bound to device, so delete it after | |
2221 | * device was safely removed | |
2222 | */ | |
2223 | if (block) | |
2224 | dasd_free_block(block); | |
1da177e4 LT |
2225 | } |
2226 | ||
1c01b8a5 HH |
2227 | /* |
2228 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2229 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2230 | * or the user has started activation through sysfs. |
2231 | */ | |
8e09f215 SW |
2232 | int dasd_generic_set_online(struct ccw_device *cdev, |
2233 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2234 | { |
aa88861f | 2235 | struct dasd_discipline *discipline; |
1da177e4 | 2236 | struct dasd_device *device; |
c6eb7b77 | 2237 | int rc; |
f24acd45 | 2238 | |
40545573 HH |
2239 | /* first online clears initial online feature flag */ |
2240 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2241 | device = dasd_create_device(cdev); |
2242 | if (IS_ERR(device)) | |
2243 | return PTR_ERR(device); | |
2244 | ||
aa88861f | 2245 | discipline = base_discipline; |
c6eb7b77 | 2246 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
2247 | if (!dasd_diag_discipline_pointer) { |
2248 | printk (KERN_WARNING | |
2249 | "dasd_generic couldn't online device %s " | |
2250 | "- discipline DIAG not available\n", | |
2a0217d5 | 2251 | dev_name(&cdev->dev)); |
1da177e4 LT |
2252 | dasd_delete_device(device); |
2253 | return -ENODEV; | |
2254 | } | |
2255 | discipline = dasd_diag_discipline_pointer; | |
2256 | } | |
aa88861f PO |
2257 | if (!try_module_get(base_discipline->owner)) { |
2258 | dasd_delete_device(device); | |
2259 | return -EINVAL; | |
2260 | } | |
2261 | if (!try_module_get(discipline->owner)) { | |
2262 | module_put(base_discipline->owner); | |
2263 | dasd_delete_device(device); | |
2264 | return -EINVAL; | |
2265 | } | |
2266 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2267 | device->discipline = discipline; |
2268 | ||
8e09f215 | 2269 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2270 | rc = discipline->check_device(device); |
2271 | if (rc) { | |
2272 | printk (KERN_WARNING | |
2273 | "dasd_generic couldn't online device %s " | |
2274 | "with discipline %s rc=%i\n", | |
2a0217d5 | 2275 | dev_name(&cdev->dev), discipline->name, rc); |
aa88861f PO |
2276 | module_put(discipline->owner); |
2277 | module_put(base_discipline->owner); | |
1da177e4 LT |
2278 | dasd_delete_device(device); |
2279 | return rc; | |
2280 | } | |
2281 | ||
2282 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2283 | if (device->state <= DASD_STATE_KNOWN) { | |
2284 | printk (KERN_WARNING | |
2285 | "dasd_generic discipline not found for %s\n", | |
2a0217d5 | 2286 | dev_name(&cdev->dev)); |
1da177e4 LT |
2287 | rc = -ENODEV; |
2288 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2289 | if (device->block) |
2290 | dasd_free_block(device->block); | |
1da177e4 LT |
2291 | dasd_delete_device(device); |
2292 | } else | |
2293 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2294 | dev_name(&cdev->dev)); |
1da177e4 LT |
2295 | |
2296 | /* FIXME: we have to wait for the root device but we don't want | |
2297 | * to wait for each single device but for all at once. */ | |
2298 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2299 | ||
2300 | dasd_put_device(device); | |
2301 | ||
2302 | return rc; | |
2303 | } | |
2304 | ||
8e09f215 | 2305 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2306 | { |
2307 | struct dasd_device *device; | |
8e09f215 | 2308 | struct dasd_block *block; |
dafd87aa | 2309 | int max_count, open_count; |
1da177e4 LT |
2310 | |
2311 | device = dasd_device_from_cdev(cdev); | |
2312 | if (IS_ERR(device)) | |
2313 | return PTR_ERR(device); | |
2314 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2315 | /* Already doing offline processing */ | |
2316 | dasd_put_device(device); | |
2317 | return 0; | |
2318 | } | |
2319 | /* | |
2320 | * We must make sure that this device is currently not in use. | |
2321 | * The open_count is increased for every opener, that includes | |
2322 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2323 | * in the other openers. | |
2324 | */ | |
8e09f215 | 2325 | if (device->block) { |
a806170e HC |
2326 | max_count = device->block->bdev ? 0 : -1; |
2327 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2328 | if (open_count > max_count) { |
2329 | if (open_count > 0) | |
2330 | printk(KERN_WARNING "Can't offline dasd " | |
2331 | "device with open count = %i.\n", | |
2332 | open_count); | |
2333 | else | |
2334 | printk(KERN_WARNING "%s", | |
2335 | "Can't offline dasd device due " | |
2336 | "to internal use\n"); | |
2337 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); | |
2338 | dasd_put_device(device); | |
2339 | return -EBUSY; | |
2340 | } | |
1da177e4 LT |
2341 | } |
2342 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2343 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2344 | block = device->block; |
2345 | device->block = NULL; | |
1da177e4 | 2346 | dasd_delete_device(device); |
8e09f215 SW |
2347 | /* |
2348 | * life cycle of block is bound to device, so delete it after | |
2349 | * device was safely removed | |
2350 | */ | |
2351 | if (block) | |
2352 | dasd_free_block(block); | |
1da177e4 LT |
2353 | return 0; |
2354 | } | |
2355 | ||
8e09f215 | 2356 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2357 | { |
2358 | struct dasd_device *device; | |
2359 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
2360 | int ret; |
2361 | ||
91c36919 | 2362 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2363 | if (IS_ERR(device)) |
2364 | return 0; | |
1da177e4 LT |
2365 | ret = 0; |
2366 | switch (event) { | |
2367 | case CIO_GONE: | |
2368 | case CIO_NO_PATH: | |
20c64468 SW |
2369 | /* First of all call extended error reporting. */ |
2370 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2371 | ||
1da177e4 LT |
2372 | if (device->state < DASD_STATE_BASIC) |
2373 | break; | |
2374 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2375 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2376 | if (cqr->status == DASD_CQR_IN_IO) { | |
2377 | cqr->status = DASD_CQR_QUEUED; | |
2378 | cqr->retries++; | |
2379 | } | |
2380 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2381 | dasd_device_clear_timer(device); | |
2382 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2383 | ret = 1; |
2384 | break; | |
2385 | case CIO_OPER: | |
2386 | /* FIXME: add a sanity check. */ | |
8e09f215 SW |
2387 | device->stopped &= ~DASD_STOPPED_DC_WAIT; |
2388 | dasd_schedule_device_bh(device); | |
2389 | if (device->block) | |
2390 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2391 | ret = 1; |
2392 | break; | |
2393 | } | |
1da177e4 LT |
2394 | dasd_put_device(device); |
2395 | return ret; | |
2396 | } | |
2397 | ||
763968e2 HC |
2398 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2399 | void *rdc_buffer, | |
2400 | int rdc_buffer_size, | |
2401 | char *magic) | |
17283b56 CH |
2402 | { |
2403 | struct dasd_ccw_req *cqr; | |
2404 | struct ccw1 *ccw; | |
2405 | ||
2406 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2407 | ||
2408 | if (IS_ERR(cqr)) { | |
2409 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
2410 | "Could not allocate RDC request"); | |
2411 | return cqr; | |
2412 | } | |
2413 | ||
2414 | ccw = cqr->cpaddr; | |
2415 | ccw->cmd_code = CCW_CMD_RDC; | |
2416 | ccw->cda = (__u32)(addr_t)rdc_buffer; | |
2417 | ccw->count = rdc_buffer_size; | |
2418 | ||
8e09f215 SW |
2419 | cqr->startdev = device; |
2420 | cqr->memdev = device; | |
17283b56 CH |
2421 | cqr->expires = 10*HZ; |
2422 | clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
2423 | cqr->retries = 2; | |
2424 | cqr->buildclk = get_clock(); | |
2425 | cqr->status = DASD_CQR_FILLED; | |
2426 | return cqr; | |
2427 | } | |
2428 | ||
2429 | ||
2430 | int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic, | |
2431 | void **rdc_buffer, int rdc_buffer_size) | |
2432 | { | |
2433 | int ret; | |
2434 | struct dasd_ccw_req *cqr; | |
2435 | ||
2436 | cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size, | |
2437 | magic); | |
2438 | if (IS_ERR(cqr)) | |
2439 | return PTR_ERR(cqr); | |
2440 | ||
2441 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2442 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2443 | return ret; |
2444 | } | |
aaff0f64 | 2445 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2446 | |
f3eb5384 SW |
2447 | /* |
2448 | * In command mode and transport mode we need to look for sense | |
2449 | * data in different places. The sense data itself is allways | |
2450 | * an array of 32 bytes, so we can unify the sense data access | |
2451 | * for both modes. | |
2452 | */ | |
2453 | char *dasd_get_sense(struct irb *irb) | |
2454 | { | |
2455 | struct tsb *tsb = NULL; | |
2456 | char *sense = NULL; | |
2457 | ||
2458 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
2459 | if (irb->scsw.tm.tcw) | |
2460 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
2461 | irb->scsw.tm.tcw); | |
2462 | if (tsb && tsb->length == 64 && tsb->flags) | |
2463 | switch (tsb->flags & 0x07) { | |
2464 | case 1: /* tsa_iostat */ | |
2465 | sense = tsb->tsa.iostat.sense; | |
2466 | break; | |
2467 | case 2: /* tsa_ddpc */ | |
2468 | sense = tsb->tsa.ddpc.sense; | |
2469 | break; | |
2470 | default: | |
2471 | /* currently we don't use interrogate data */ | |
2472 | break; | |
2473 | } | |
2474 | } else if (irb->esw.esw0.erw.cons) { | |
2475 | sense = irb->ecw; | |
2476 | } | |
2477 | return sense; | |
2478 | } | |
2479 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
2480 | ||
8e09f215 | 2481 | static int __init dasd_init(void) |
1da177e4 LT |
2482 | { |
2483 | int rc; | |
2484 | ||
2485 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2486 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2487 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2488 | |
2489 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2490 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2491 | if (dasd_debug_area == NULL) { |
2492 | rc = -ENOMEM; | |
2493 | goto failed; | |
2494 | } | |
2495 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2496 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2497 | |
2498 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2499 | ||
2500 | dasd_diag_discipline_pointer = NULL; | |
2501 | ||
1da177e4 LT |
2502 | rc = dasd_devmap_init(); |
2503 | if (rc) | |
2504 | goto failed; | |
2505 | rc = dasd_gendisk_init(); | |
2506 | if (rc) | |
2507 | goto failed; | |
2508 | rc = dasd_parse(); | |
2509 | if (rc) | |
2510 | goto failed; | |
20c64468 SW |
2511 | rc = dasd_eer_init(); |
2512 | if (rc) | |
2513 | goto failed; | |
1da177e4 LT |
2514 | #ifdef CONFIG_PROC_FS |
2515 | rc = dasd_proc_init(); | |
2516 | if (rc) | |
2517 | goto failed; | |
2518 | #endif | |
2519 | ||
2520 | return 0; | |
2521 | failed: | |
2522 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2523 | dasd_exit(); | |
2524 | return rc; | |
2525 | } | |
2526 | ||
2527 | module_init(dasd_init); | |
2528 | module_exit(dasd_exit); | |
2529 | ||
2530 | EXPORT_SYMBOL(dasd_debug_area); | |
2531 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2532 | ||
2533 | EXPORT_SYMBOL(dasd_add_request_head); | |
2534 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2535 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2536 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2537 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2538 | EXPORT_SYMBOL(dasd_enable_device); |
2539 | EXPORT_SYMBOL(dasd_int_handler); | |
2540 | EXPORT_SYMBOL(dasd_kfree_request); | |
2541 | EXPORT_SYMBOL(dasd_kick_device); | |
2542 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2543 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2544 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2545 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2546 | EXPORT_SYMBOL(dasd_device_set_timer); |
2547 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2548 | EXPORT_SYMBOL(dasd_sfree_request); |
2549 | EXPORT_SYMBOL(dasd_sleep_on); | |
2550 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2551 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2552 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2553 | EXPORT_SYMBOL(dasd_start_IO); | |
2554 | EXPORT_SYMBOL(dasd_term_IO); | |
2555 | ||
2556 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2557 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2558 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2559 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2560 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2561 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2562 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2563 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2564 | EXPORT_SYMBOL_GPL(dasd_free_block); |