Commit | Line | Data |
---|---|---|
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 | ||
fc19f381 SH |
12 | #define KMSG_COMPONENT "dasd" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
1da177e4 LT |
15 | #include <linux/kmod.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/major.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/buffer_head.h> | |
a885c8c4 | 22 | #include <linux/hdreg.h> |
f3445a1a | 23 | #include <linux/async.h> |
1da177e4 LT |
24 | |
25 | #include <asm/ccwdev.h> | |
26 | #include <asm/ebcdic.h> | |
27 | #include <asm/idals.h> | |
28 | #include <asm/todclk.h> | |
f3eb5384 | 29 | #include <asm/itcw.h> |
1da177e4 LT |
30 | |
31 | /* This is ugly... */ | |
32 | #define PRINTK_HEADER "dasd:" | |
33 | ||
34 | #include "dasd_int.h" | |
35 | /* | |
36 | * SECTION: Constant definitions to be used within this file | |
37 | */ | |
38 | #define DASD_CHANQ_MAX_SIZE 4 | |
39 | ||
40 | /* | |
41 | * SECTION: exported variables of dasd.c | |
42 | */ | |
43 | debug_info_t *dasd_debug_area; | |
44 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 45 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
46 | |
47 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
48 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
49 | " Copyright 2000 IBM Corporation"); | |
50 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
51 | MODULE_LICENSE("GPL"); |
52 | ||
53 | /* | |
54 | * SECTION: prototypes for static functions of dasd.c | |
55 | */ | |
8e09f215 SW |
56 | static int dasd_alloc_queue(struct dasd_block *); |
57 | static void dasd_setup_queue(struct dasd_block *); | |
58 | static void dasd_free_queue(struct dasd_block *); | |
59 | static void dasd_flush_request_queue(struct dasd_block *); | |
60 | static int dasd_flush_block_queue(struct dasd_block *); | |
61 | static void dasd_device_tasklet(struct dasd_device *); | |
62 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 63 | static void do_kick_device(struct work_struct *); |
8e09f215 | 64 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
65 | static void dasd_device_timeout(unsigned long); |
66 | static void dasd_block_timeout(unsigned long); | |
1da177e4 LT |
67 | |
68 | /* | |
69 | * SECTION: Operations on the device structure. | |
70 | */ | |
71 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 72 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 73 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
74 | |
75 | /* | |
76 | * Allocate memory for a new device structure. | |
77 | */ | |
8e09f215 | 78 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
79 | { |
80 | struct dasd_device *device; | |
81 | ||
8e09f215 SW |
82 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
83 | if (!device) | |
1da177e4 | 84 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
85 | |
86 | /* Get two pages for normal block device operations. */ | |
87 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 88 | if (!device->ccw_mem) { |
1da177e4 LT |
89 | kfree(device); |
90 | return ERR_PTR(-ENOMEM); | |
91 | } | |
92 | /* Get one page for error recovery. */ | |
93 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 94 | if (!device->erp_mem) { |
1da177e4 LT |
95 | free_pages((unsigned long) device->ccw_mem, 1); |
96 | kfree(device); | |
97 | return ERR_PTR(-ENOMEM); | |
98 | } | |
99 | ||
100 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
101 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
102 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 103 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 104 | tasklet_init(&device->tasklet, |
8e09f215 | 105 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
106 | (unsigned long) device); |
107 | INIT_LIST_HEAD(&device->ccw_queue); | |
108 | init_timer(&device->timer); | |
48cae885 SW |
109 | device->timer.function = dasd_device_timeout; |
110 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 111 | INIT_WORK(&device->kick_work, do_kick_device); |
1da177e4 LT |
112 | device->state = DASD_STATE_NEW; |
113 | device->target = DASD_STATE_NEW; | |
114 | ||
115 | return device; | |
116 | } | |
117 | ||
118 | /* | |
119 | * Free memory of a device structure. | |
120 | */ | |
8e09f215 | 121 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 122 | { |
17fd682e | 123 | kfree(device->private); |
1da177e4 LT |
124 | free_page((unsigned long) device->erp_mem); |
125 | free_pages((unsigned long) device->ccw_mem, 1); | |
126 | kfree(device); | |
127 | } | |
128 | ||
8e09f215 SW |
129 | /* |
130 | * Allocate memory for a new device structure. | |
131 | */ | |
132 | struct dasd_block *dasd_alloc_block(void) | |
133 | { | |
134 | struct dasd_block *block; | |
135 | ||
136 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
137 | if (!block) | |
138 | return ERR_PTR(-ENOMEM); | |
139 | /* open_count = 0 means device online but not in use */ | |
140 | atomic_set(&block->open_count, -1); | |
141 | ||
142 | spin_lock_init(&block->request_queue_lock); | |
143 | atomic_set(&block->tasklet_scheduled, 0); | |
144 | tasklet_init(&block->tasklet, | |
145 | (void (*)(unsigned long)) dasd_block_tasklet, | |
146 | (unsigned long) block); | |
147 | INIT_LIST_HEAD(&block->ccw_queue); | |
148 | spin_lock_init(&block->queue_lock); | |
149 | init_timer(&block->timer); | |
48cae885 SW |
150 | block->timer.function = dasd_block_timeout; |
151 | block->timer.data = (unsigned long) block; | |
8e09f215 SW |
152 | |
153 | return block; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Free memory of a device structure. | |
158 | */ | |
159 | void dasd_free_block(struct dasd_block *block) | |
160 | { | |
161 | kfree(block); | |
162 | } | |
163 | ||
1da177e4 LT |
164 | /* |
165 | * Make a new device known to the system. | |
166 | */ | |
8e09f215 | 167 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
168 | { |
169 | int rc; | |
170 | ||
171 | /* | |
138c014d | 172 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
173 | * keep the reference count > 0. |
174 | */ | |
175 | dasd_get_device(device); | |
176 | ||
8e09f215 SW |
177 | if (device->block) { |
178 | rc = dasd_alloc_queue(device->block); | |
179 | if (rc) { | |
180 | dasd_put_device(device); | |
181 | return rc; | |
182 | } | |
1da177e4 | 183 | } |
1da177e4 LT |
184 | device->state = DASD_STATE_KNOWN; |
185 | return 0; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Let the system forget about a device. | |
190 | */ | |
8e09f215 | 191 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 192 | { |
20c64468 SW |
193 | /* Disable extended error reporting for this device. */ |
194 | dasd_eer_disable(device); | |
1da177e4 | 195 | /* Forget the discipline information. */ |
8e09f215 SW |
196 | if (device->discipline) { |
197 | if (device->discipline->uncheck_device) | |
198 | device->discipline->uncheck_device(device); | |
aa88861f | 199 | module_put(device->discipline->owner); |
8e09f215 | 200 | } |
1da177e4 | 201 | device->discipline = NULL; |
aa88861f PO |
202 | if (device->base_discipline) |
203 | module_put(device->base_discipline->owner); | |
204 | device->base_discipline = NULL; | |
1da177e4 LT |
205 | device->state = DASD_STATE_NEW; |
206 | ||
8e09f215 SW |
207 | if (device->block) |
208 | dasd_free_queue(device->block); | |
1da177e4 LT |
209 | |
210 | /* Give up reference we took in dasd_state_new_to_known. */ | |
211 | dasd_put_device(device); | |
8f61701b | 212 | return 0; |
1da177e4 LT |
213 | } |
214 | ||
215 | /* | |
216 | * Request the irq line for the device. | |
217 | */ | |
8e09f215 | 218 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
219 | { |
220 | int rc; | |
221 | ||
222 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
223 | if (device->block) { |
224 | rc = dasd_gendisk_alloc(device->block); | |
225 | if (rc) | |
226 | return rc; | |
227 | } | |
1da177e4 | 228 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 229 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 230 | 8 * sizeof(long)); |
1da177e4 | 231 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 232 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
233 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
234 | ||
235 | device->state = DASD_STATE_BASIC; | |
236 | return 0; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Release the irq line for the device. Terminate any running i/o. | |
241 | */ | |
8e09f215 | 242 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 243 | { |
8f61701b | 244 | int rc; |
8e09f215 SW |
245 | if (device->block) { |
246 | dasd_gendisk_free(device->block); | |
247 | dasd_block_clear_timer(device->block); | |
248 | } | |
249 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
250 | if (rc) |
251 | return rc; | |
8e09f215 | 252 | dasd_device_clear_timer(device); |
8f61701b | 253 | |
1da177e4 LT |
254 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
255 | if (device->debug_area != NULL) { | |
256 | debug_unregister(device->debug_area); | |
257 | device->debug_area = NULL; | |
258 | } | |
259 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 260 | return 0; |
1da177e4 LT |
261 | } |
262 | ||
263 | /* | |
264 | * Do the initial analysis. The do_analysis function may return | |
265 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
266 | * until the discipline decides to continue the startup sequence | |
267 | * by calling the function dasd_change_state. The eckd disciplines | |
268 | * uses this to start a ccw that detects the format. The completion | |
269 | * interrupt for this detection ccw uses the kernel event daemon to | |
270 | * trigger the call to dasd_change_state. All this is done in the | |
271 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
272 | * After the analysis ccw is done (do_analysis returned 0) the block |
273 | * device is setup. | |
274 | * In case the analysis returns an error, the device setup is stopped | |
275 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 276 | */ |
8e09f215 | 277 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
278 | { |
279 | int rc; | |
8e09f215 | 280 | struct dasd_block *block; |
1da177e4 LT |
281 | |
282 | rc = 0; | |
8e09f215 | 283 | block = device->block; |
90f0094d | 284 | /* make disk known with correct capacity */ |
8e09f215 SW |
285 | if (block) { |
286 | if (block->base->discipline->do_analysis != NULL) | |
287 | rc = block->base->discipline->do_analysis(block); | |
288 | if (rc) { | |
289 | if (rc != -EAGAIN) | |
290 | device->state = DASD_STATE_UNFMT; | |
291 | return rc; | |
292 | } | |
293 | dasd_setup_queue(block); | |
294 | set_capacity(block->gdp, | |
295 | block->blocks << block->s2b_shift); | |
296 | device->state = DASD_STATE_READY; | |
297 | rc = dasd_scan_partitions(block); | |
298 | if (rc) | |
299 | device->state = DASD_STATE_BASIC; | |
300 | } else { | |
301 | device->state = DASD_STATE_READY; | |
302 | } | |
90f0094d | 303 | return rc; |
1da177e4 LT |
304 | } |
305 | ||
306 | /* | |
307 | * Remove device from block device layer. Destroy dirty buffers. | |
308 | * Forget format information. Check if the target level is basic | |
309 | * and if it is create fake disk for formatting. | |
310 | */ | |
8e09f215 | 311 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 312 | { |
8f61701b HH |
313 | int rc; |
314 | ||
1da177e4 | 315 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
316 | if (device->block) { |
317 | struct dasd_block *block = device->block; | |
318 | rc = dasd_flush_block_queue(block); | |
319 | if (rc) { | |
320 | device->state = DASD_STATE_READY; | |
321 | return rc; | |
322 | } | |
323 | dasd_destroy_partitions(block); | |
324 | dasd_flush_request_queue(block); | |
325 | block->blocks = 0; | |
326 | block->bp_block = 0; | |
327 | block->s2b_shift = 0; | |
328 | } | |
8f61701b | 329 | return 0; |
1da177e4 LT |
330 | } |
331 | ||
90f0094d HH |
332 | /* |
333 | * Back to basic. | |
334 | */ | |
8e09f215 | 335 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
336 | { |
337 | device->state = DASD_STATE_BASIC; | |
8f61701b | 338 | return 0; |
90f0094d HH |
339 | } |
340 | ||
1da177e4 LT |
341 | /* |
342 | * Make the device online and schedule the bottom half to start | |
343 | * the requeueing of requests from the linux request queue to the | |
344 | * ccw queue. | |
345 | */ | |
8f61701b | 346 | static int |
1da177e4 LT |
347 | dasd_state_ready_to_online(struct dasd_device * device) |
348 | { | |
8e09f215 | 349 | int rc; |
1301809b SW |
350 | struct gendisk *disk; |
351 | struct disk_part_iter piter; | |
352 | struct hd_struct *part; | |
8e09f215 SW |
353 | |
354 | if (device->discipline->ready_to_online) { | |
355 | rc = device->discipline->ready_to_online(device); | |
356 | if (rc) | |
357 | return rc; | |
358 | } | |
1da177e4 | 359 | device->state = DASD_STATE_ONLINE; |
1301809b | 360 | if (device->block) { |
8e09f215 | 361 | dasd_schedule_block_bh(device->block); |
1301809b SW |
362 | disk = device->block->bdev->bd_disk; |
363 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
364 | while ((part = disk_part_iter_next(&piter))) | |
365 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
366 | disk_part_iter_exit(&piter); | |
367 | } | |
1da177e4 LT |
368 | return 0; |
369 | } | |
370 | ||
371 | /* | |
372 | * Stop the requeueing of requests again. | |
373 | */ | |
8e09f215 | 374 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 375 | { |
8e09f215 | 376 | int rc; |
1301809b SW |
377 | struct gendisk *disk; |
378 | struct disk_part_iter piter; | |
379 | struct hd_struct *part; | |
8e09f215 SW |
380 | |
381 | if (device->discipline->online_to_ready) { | |
382 | rc = device->discipline->online_to_ready(device); | |
383 | if (rc) | |
384 | return rc; | |
385 | } | |
1da177e4 | 386 | device->state = DASD_STATE_READY; |
1301809b SW |
387 | if (device->block) { |
388 | disk = device->block->bdev->bd_disk; | |
389 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
390 | while ((part = disk_part_iter_next(&piter))) | |
391 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
392 | disk_part_iter_exit(&piter); | |
393 | } | |
8f61701b | 394 | return 0; |
1da177e4 LT |
395 | } |
396 | ||
397 | /* | |
398 | * Device startup state changes. | |
399 | */ | |
8e09f215 | 400 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
401 | { |
402 | int rc; | |
403 | ||
404 | rc = 0; | |
405 | if (device->state == DASD_STATE_NEW && | |
406 | device->target >= DASD_STATE_KNOWN) | |
407 | rc = dasd_state_new_to_known(device); | |
408 | ||
409 | if (!rc && | |
410 | device->state == DASD_STATE_KNOWN && | |
411 | device->target >= DASD_STATE_BASIC) | |
412 | rc = dasd_state_known_to_basic(device); | |
413 | ||
414 | if (!rc && | |
415 | device->state == DASD_STATE_BASIC && | |
416 | device->target >= DASD_STATE_READY) | |
417 | rc = dasd_state_basic_to_ready(device); | |
418 | ||
39ccf95e HH |
419 | if (!rc && |
420 | device->state == DASD_STATE_UNFMT && | |
421 | device->target > DASD_STATE_UNFMT) | |
422 | rc = -EPERM; | |
423 | ||
1da177e4 LT |
424 | if (!rc && |
425 | device->state == DASD_STATE_READY && | |
426 | device->target >= DASD_STATE_ONLINE) | |
427 | rc = dasd_state_ready_to_online(device); | |
428 | ||
429 | return rc; | |
430 | } | |
431 | ||
432 | /* | |
433 | * Device shutdown state changes. | |
434 | */ | |
8e09f215 | 435 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 436 | { |
8f61701b HH |
437 | int rc; |
438 | ||
439 | rc = 0; | |
1da177e4 LT |
440 | if (device->state == DASD_STATE_ONLINE && |
441 | device->target <= DASD_STATE_READY) | |
8f61701b | 442 | rc = dasd_state_online_to_ready(device); |
138c014d | 443 | |
8f61701b HH |
444 | if (!rc && |
445 | device->state == DASD_STATE_READY && | |
1da177e4 | 446 | device->target <= DASD_STATE_BASIC) |
8f61701b | 447 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 448 | |
8f61701b HH |
449 | if (!rc && |
450 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 451 | device->target <= DASD_STATE_BASIC) |
8f61701b | 452 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 453 | |
8f61701b HH |
454 | if (!rc && |
455 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 456 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 457 | rc = dasd_state_basic_to_known(device); |
138c014d | 458 | |
8f61701b HH |
459 | if (!rc && |
460 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 461 | device->target <= DASD_STATE_NEW) |
8f61701b | 462 | rc = dasd_state_known_to_new(device); |
1da177e4 | 463 | |
8f61701b | 464 | return rc; |
1da177e4 LT |
465 | } |
466 | ||
467 | /* | |
468 | * This is the main startup/shutdown routine. | |
469 | */ | |
8e09f215 | 470 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 LT |
471 | { |
472 | int rc; | |
473 | ||
474 | if (device->state == device->target) | |
475 | /* Already where we want to go today... */ | |
476 | return; | |
477 | if (device->state < device->target) | |
478 | rc = dasd_increase_state(device); | |
479 | else | |
480 | rc = dasd_decrease_state(device); | |
481 | if (rc && rc != -EAGAIN) | |
482 | device->target = device->state; | |
483 | ||
f3445a1a | 484 | if (device->state == device->target) { |
1da177e4 | 485 | wake_up(&dasd_init_waitq); |
f3445a1a CH |
486 | dasd_put_device(device); |
487 | } | |
4dfd5c45 HH |
488 | |
489 | /* let user-space know that the device status changed */ | |
490 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
491 | } |
492 | ||
493 | /* | |
494 | * Kick starter for devices that did not complete the startup/shutdown | |
495 | * procedure or were sleeping because of a pending state. | |
496 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
497 | * event daemon. | |
498 | */ | |
8e09f215 | 499 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 500 | { |
4927b3f7 | 501 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
1da177e4 | 502 | dasd_change_state(device); |
8e09f215 | 503 | dasd_schedule_device_bh(device); |
1da177e4 LT |
504 | dasd_put_device(device); |
505 | } | |
506 | ||
8e09f215 | 507 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
508 | { |
509 | dasd_get_device(device); | |
510 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
511 | schedule_work(&device->kick_work); | |
512 | } | |
513 | ||
514 | /* | |
515 | * Set the target state for a device and starts the state change. | |
516 | */ | |
8e09f215 | 517 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 518 | { |
f3445a1a | 519 | dasd_get_device(device); |
1da177e4 LT |
520 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
521 | if (dasd_probeonly && target > DASD_STATE_READY) | |
522 | target = DASD_STATE_READY; | |
523 | if (device->target != target) { | |
f3445a1a | 524 | if (device->state == target) { |
1da177e4 | 525 | wake_up(&dasd_init_waitq); |
f3445a1a CH |
526 | dasd_put_device(device); |
527 | } | |
1da177e4 LT |
528 | device->target = target; |
529 | } | |
530 | if (device->state != device->target) | |
531 | dasd_change_state(device); | |
532 | } | |
533 | ||
534 | /* | |
535 | * Enable devices with device numbers in [from..to]. | |
536 | */ | |
8e09f215 | 537 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
538 | { |
539 | return (device->state == device->target); | |
540 | } | |
541 | ||
8e09f215 | 542 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
543 | { |
544 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
545 | if (device->state <= DASD_STATE_KNOWN) | |
546 | /* No discipline for device found. */ | |
547 | dasd_set_target_state(device, DASD_STATE_NEW); | |
548 | /* Now wait for the devices to come up. */ | |
549 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
550 | } | |
551 | ||
552 | /* | |
553 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
554 | */ | |
555 | #ifdef CONFIG_DASD_PROFILE | |
556 | ||
557 | struct dasd_profile_info_t dasd_global_profile; | |
558 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
559 | ||
560 | /* | |
561 | * Increments counter in global and local profiling structures. | |
562 | */ | |
8e09f215 | 563 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
564 | { \ |
565 | int index; \ | |
566 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
567 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 568 | block->profile.counter[index]++; \ |
1da177e4 LT |
569 | } |
570 | ||
571 | /* | |
572 | * Add profiling information for cqr before execution. | |
573 | */ | |
8e09f215 SW |
574 | static void dasd_profile_start(struct dasd_block *block, |
575 | struct dasd_ccw_req *cqr, | |
576 | struct request *req) | |
1da177e4 LT |
577 | { |
578 | struct list_head *l; | |
579 | unsigned int counter; | |
580 | ||
581 | if (dasd_profile_level != DASD_PROFILE_ON) | |
582 | return; | |
583 | ||
584 | /* count the length of the chanq for statistics */ | |
585 | counter = 0; | |
8e09f215 | 586 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
587 | if (++counter >= 31) |
588 | break; | |
589 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 590 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
591 | } |
592 | ||
593 | /* | |
594 | * Add profiling information for cqr after execution. | |
595 | */ | |
8e09f215 SW |
596 | static void dasd_profile_end(struct dasd_block *block, |
597 | struct dasd_ccw_req *cqr, | |
598 | struct request *req) | |
1da177e4 LT |
599 | { |
600 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
601 | long tottimeps, sectors; | |
602 | ||
603 | if (dasd_profile_level != DASD_PROFILE_ON) | |
604 | return; | |
605 | ||
83096ebf | 606 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
607 | if (!cqr->buildclk || !cqr->startclk || |
608 | !cqr->stopclk || !cqr->endclk || | |
609 | !sectors) | |
610 | return; | |
611 | ||
612 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
613 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
614 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
615 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
616 | tottimeps = tottime / sectors; | |
617 | ||
618 | if (!dasd_global_profile.dasd_io_reqs) | |
619 | memset(&dasd_global_profile, 0, | |
8e09f215 | 620 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
621 | dasd_global_profile.dasd_io_reqs++; |
622 | dasd_global_profile.dasd_io_sects += sectors; | |
623 | ||
8e09f215 SW |
624 | if (!block->profile.dasd_io_reqs) |
625 | memset(&block->profile, 0, | |
626 | sizeof(struct dasd_profile_info_t)); | |
627 | block->profile.dasd_io_reqs++; | |
628 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 629 | |
8e09f215 SW |
630 | dasd_profile_counter(sectors, dasd_io_secs, block); |
631 | dasd_profile_counter(tottime, dasd_io_times, block); | |
632 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
633 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
634 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
635 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
636 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
637 | } |
638 | #else | |
8e09f215 SW |
639 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
640 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
641 | #endif /* CONFIG_DASD_PROFILE */ |
642 | ||
643 | /* | |
644 | * Allocate memory for a channel program with 'cplength' channel | |
645 | * command words and 'datasize' additional space. There are two | |
646 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
647 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
648 | * that gets allocated for each device. | |
649 | */ | |
8e09f215 SW |
650 | struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength, |
651 | int datasize, | |
652 | struct dasd_device *device) | |
1da177e4 LT |
653 | { |
654 | struct dasd_ccw_req *cqr; | |
655 | ||
656 | /* Sanity checks */ | |
7ac1e877 ES |
657 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
658 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 659 | |
88abaab4 | 660 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
661 | if (cqr == NULL) |
662 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
663 | cqr->cpaddr = NULL; |
664 | if (cplength > 0) { | |
88abaab4 | 665 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
666 | GFP_ATOMIC | GFP_DMA); |
667 | if (cqr->cpaddr == NULL) { | |
668 | kfree(cqr); | |
669 | return ERR_PTR(-ENOMEM); | |
670 | } | |
1da177e4 LT |
671 | } |
672 | cqr->data = NULL; | |
673 | if (datasize > 0) { | |
88abaab4 | 674 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 675 | if (cqr->data == NULL) { |
17fd682e | 676 | kfree(cqr->cpaddr); |
1da177e4 LT |
677 | kfree(cqr); |
678 | return ERR_PTR(-ENOMEM); | |
679 | } | |
1da177e4 LT |
680 | } |
681 | strncpy((char *) &cqr->magic, magic, 4); | |
682 | ASCEBC((char *) &cqr->magic, 4); | |
683 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
684 | dasd_get_device(device); | |
685 | return cqr; | |
686 | } | |
687 | ||
8e09f215 SW |
688 | struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, |
689 | int datasize, | |
690 | struct dasd_device *device) | |
1da177e4 LT |
691 | { |
692 | unsigned long flags; | |
693 | struct dasd_ccw_req *cqr; | |
694 | char *data; | |
695 | int size; | |
696 | ||
697 | /* Sanity checks */ | |
7ac1e877 ES |
698 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
699 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
700 | |
701 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
702 | if (cplength > 0) | |
703 | size += cplength * sizeof(struct ccw1); | |
704 | if (datasize > 0) | |
705 | size += datasize; | |
706 | spin_lock_irqsave(&device->mem_lock, flags); | |
707 | cqr = (struct dasd_ccw_req *) | |
708 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
709 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
710 | if (cqr == NULL) | |
711 | return ERR_PTR(-ENOMEM); | |
712 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
713 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
714 | cqr->cpaddr = NULL; | |
715 | if (cplength > 0) { | |
716 | cqr->cpaddr = (struct ccw1 *) data; | |
717 | data += cplength*sizeof(struct ccw1); | |
718 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
719 | } | |
720 | cqr->data = NULL; | |
721 | if (datasize > 0) { | |
722 | cqr->data = data; | |
723 | memset(cqr->data, 0, datasize); | |
724 | } | |
725 | strncpy((char *) &cqr->magic, magic, 4); | |
726 | ASCEBC((char *) &cqr->magic, 4); | |
727 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
728 | dasd_get_device(device); | |
729 | return cqr; | |
730 | } | |
731 | ||
732 | /* | |
733 | * Free memory of a channel program. This function needs to free all the | |
734 | * idal lists that might have been created by dasd_set_cda and the | |
735 | * struct dasd_ccw_req itself. | |
736 | */ | |
8e09f215 | 737 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 738 | { |
347a8dc3 | 739 | #ifdef CONFIG_64BIT |
1da177e4 LT |
740 | struct ccw1 *ccw; |
741 | ||
742 | /* Clear any idals used for the request. */ | |
743 | ccw = cqr->cpaddr; | |
744 | do { | |
745 | clear_normalized_cda(ccw); | |
746 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
747 | #endif | |
17fd682e JJ |
748 | kfree(cqr->cpaddr); |
749 | kfree(cqr->data); | |
1da177e4 LT |
750 | kfree(cqr); |
751 | dasd_put_device(device); | |
752 | } | |
753 | ||
8e09f215 | 754 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
755 | { |
756 | unsigned long flags; | |
757 | ||
758 | spin_lock_irqsave(&device->mem_lock, flags); | |
759 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
760 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
761 | dasd_put_device(device); | |
762 | } | |
763 | ||
764 | /* | |
765 | * Check discipline magic in cqr. | |
766 | */ | |
8e09f215 | 767 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
768 | { |
769 | struct dasd_device *device; | |
770 | ||
771 | if (cqr == NULL) | |
772 | return -EINVAL; | |
8e09f215 | 773 | device = cqr->startdev; |
1da177e4 | 774 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 775 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
776 | " dasd_ccw_req 0x%08x magic doesn't match" |
777 | " discipline 0x%08x", | |
778 | cqr->magic, | |
779 | *(unsigned int *) device->discipline->name); | |
780 | return -EINVAL; | |
781 | } | |
782 | return 0; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Terminate the current i/o and set the request to clear_pending. | |
787 | * Timer keeps device runnig. | |
788 | * ccw_device_clear can fail if the i/o subsystem | |
789 | * is in a bad mood. | |
790 | */ | |
8e09f215 | 791 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
792 | { |
793 | struct dasd_device *device; | |
794 | int retries, rc; | |
fc19f381 | 795 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
796 | |
797 | /* Check the cqr */ | |
798 | rc = dasd_check_cqr(cqr); | |
799 | if (rc) | |
800 | return rc; | |
801 | retries = 0; | |
8e09f215 | 802 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
803 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
804 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
805 | switch (rc) { | |
806 | case 0: /* termination successful */ | |
c2ba444d | 807 | cqr->retries--; |
8e09f215 | 808 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 809 | cqr->stopclk = get_clock(); |
8f61701b | 810 | cqr->starttime = 0; |
1da177e4 LT |
811 | DBF_DEV_EVENT(DBF_DEBUG, device, |
812 | "terminate cqr %p successful", | |
813 | cqr); | |
814 | break; | |
815 | case -ENODEV: | |
816 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
817 | "device gone, retry"); | |
818 | break; | |
819 | case -EIO: | |
820 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
821 | "I/O error, retry"); | |
822 | break; | |
823 | case -EINVAL: | |
824 | case -EBUSY: | |
825 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
826 | "device busy, retry later"); | |
827 | break; | |
828 | default: | |
fc19f381 SH |
829 | /* internal error 10 - unknown rc*/ |
830 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
831 | dev_err(&device->cdev->dev, "An error occurred in the " | |
832 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
833 | BUG(); |
834 | break; | |
835 | } | |
836 | retries++; | |
837 | } | |
8e09f215 | 838 | dasd_schedule_device_bh(device); |
1da177e4 LT |
839 | return rc; |
840 | } | |
841 | ||
842 | /* | |
843 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
844 | * In that case set up a timer to start the request later. | |
845 | */ | |
8e09f215 | 846 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
847 | { |
848 | struct dasd_device *device; | |
849 | int rc; | |
fc19f381 | 850 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
851 | |
852 | /* Check the cqr */ | |
853 | rc = dasd_check_cqr(cqr); | |
854 | if (rc) | |
855 | return rc; | |
8e09f215 | 856 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 857 | if (cqr->retries < 0) { |
fc19f381 SH |
858 | /* internal error 14 - start_IO run out of retries */ |
859 | sprintf(errorstring, "14 %p", cqr); | |
860 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
861 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 862 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
863 | return -EIO; |
864 | } | |
865 | cqr->startclk = get_clock(); | |
866 | cqr->starttime = jiffies; | |
867 | cqr->retries--; | |
f3eb5384 SW |
868 | if (cqr->cpmode == 1) { |
869 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
870 | (long) cqr, cqr->lpm); | |
871 | } else { | |
872 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
873 | (long) cqr, cqr->lpm, 0); | |
874 | } | |
1da177e4 LT |
875 | switch (rc) { |
876 | case 0: | |
877 | cqr->status = DASD_CQR_IN_IO; | |
878 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
879 | "start_IO: request %p started successful", | |
880 | cqr); | |
881 | break; | |
882 | case -EBUSY: | |
fc19f381 | 883 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
884 | "start_IO: device busy, retry later"); |
885 | break; | |
886 | case -ETIMEDOUT: | |
fc19f381 | 887 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
888 | "start_IO: request timeout, retry later"); |
889 | break; | |
890 | case -EACCES: | |
891 | /* -EACCES indicates that the request used only a | |
892 | * subset of the available pathes and all these | |
893 | * pathes are gone. | |
894 | * Do a retry with all available pathes. | |
895 | */ | |
896 | cqr->lpm = LPM_ANYPATH; | |
fc19f381 | 897 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
898 | "start_IO: selected pathes gone," |
899 | " retry on all pathes"); | |
900 | break; | |
901 | case -ENODEV: | |
f3eb5384 SW |
902 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
903 | "start_IO: -ENODEV device gone, retry"); | |
904 | break; | |
1da177e4 | 905 | case -EIO: |
fc19f381 | 906 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
f3eb5384 | 907 | "start_IO: -EIO device gone, retry"); |
1da177e4 LT |
908 | break; |
909 | default: | |
fc19f381 SH |
910 | /* internal error 11 - unknown rc */ |
911 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
912 | dev_err(&device->cdev->dev, | |
913 | "An error occurred in the DASD device driver, " | |
914 | "reason=%s\n", errorstring); | |
1da177e4 LT |
915 | BUG(); |
916 | break; | |
917 | } | |
918 | return rc; | |
919 | } | |
920 | ||
921 | /* | |
922 | * Timeout function for dasd devices. This is used for different purposes | |
923 | * 1) missing interrupt handler for normal operation | |
924 | * 2) delayed start of request where start_IO failed with -EBUSY | |
925 | * 3) timeout for missing state change interrupts | |
926 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
927 | * DASD_CQR_QUEUED for 2) and 3). | |
928 | */ | |
8e09f215 | 929 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
930 | { |
931 | unsigned long flags; | |
932 | struct dasd_device *device; | |
933 | ||
934 | device = (struct dasd_device *) ptr; | |
935 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
936 | /* re-activate request queue */ | |
937 | device->stopped &= ~DASD_STOPPED_PENDING; | |
938 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
8e09f215 | 939 | dasd_schedule_device_bh(device); |
1da177e4 LT |
940 | } |
941 | ||
942 | /* | |
943 | * Setup timeout for a device in jiffies. | |
944 | */ | |
8e09f215 | 945 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 946 | { |
48cae885 SW |
947 | if (expires == 0) |
948 | del_timer(&device->timer); | |
949 | else | |
950 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 LT |
951 | } |
952 | ||
953 | /* | |
954 | * Clear timeout for a device. | |
955 | */ | |
8e09f215 | 956 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 957 | { |
48cae885 | 958 | del_timer(&device->timer); |
1da177e4 LT |
959 | } |
960 | ||
8e09f215 SW |
961 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
962 | unsigned long intparm) | |
1da177e4 LT |
963 | { |
964 | struct dasd_ccw_req *cqr; | |
965 | struct dasd_device *device; | |
966 | ||
f16f5843 SW |
967 | if (!intparm) |
968 | return; | |
1da177e4 LT |
969 | cqr = (struct dasd_ccw_req *) intparm; |
970 | if (cqr->status != DASD_CQR_IN_IO) { | |
fc19f381 | 971 | DBF_EVENT(DBF_DEBUG, |
1da177e4 LT |
972 | "invalid status in handle_killed_request: " |
973 | "bus_id %s, status %02x", | |
2a0217d5 | 974 | dev_name(&cdev->dev), cqr->status); |
1da177e4 LT |
975 | return; |
976 | } | |
977 | ||
8e09f215 | 978 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 979 | if (device == NULL || |
a00bfd71 | 980 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 | 981 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 SH |
982 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid device in request: " |
983 | "bus_id %s", dev_name(&cdev->dev)); | |
1da177e4 LT |
984 | return; |
985 | } | |
986 | ||
987 | /* Schedule request to be retried. */ | |
988 | cqr->status = DASD_CQR_QUEUED; | |
989 | ||
8e09f215 SW |
990 | dasd_device_clear_timer(device); |
991 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
992 | dasd_put_device(device); |
993 | } | |
994 | ||
8e09f215 | 995 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 996 | { |
20c64468 SW |
997 | /* First of all start sense subsystem status request. */ |
998 | dasd_eer_snss(device); | |
999 | ||
1da177e4 | 1000 | device->stopped &= ~DASD_STOPPED_PENDING; |
8e09f215 SW |
1001 | dasd_schedule_device_bh(device); |
1002 | if (device->block) | |
1003 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | /* | |
1007 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1008 | */ | |
8e09f215 SW |
1009 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1010 | struct irb *irb) | |
1da177e4 LT |
1011 | { |
1012 | struct dasd_ccw_req *cqr, *next; | |
1013 | struct dasd_device *device; | |
1014 | unsigned long long now; | |
1015 | int expires; | |
1da177e4 LT |
1016 | |
1017 | if (IS_ERR(irb)) { | |
1018 | switch (PTR_ERR(irb)) { | |
1019 | case -EIO: | |
1da177e4 LT |
1020 | break; |
1021 | case -ETIMEDOUT: | |
fc19f381 | 1022 | DBF_EVENT(DBF_WARNING, "%s(%s): request timed out\n", |
2a0217d5 | 1023 | __func__, dev_name(&cdev->dev)); |
1da177e4 LT |
1024 | break; |
1025 | default: | |
fc19f381 | 1026 | DBF_EVENT(DBF_WARNING, "%s(%s): unknown error %ld\n", |
2a0217d5 | 1027 | __func__, dev_name(&cdev->dev), PTR_ERR(irb)); |
1da177e4 | 1028 | } |
f16f5843 | 1029 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1030 | return; |
1031 | } | |
1032 | ||
1033 | now = get_clock(); | |
1034 | ||
8e09f215 SW |
1035 | /* check for unsolicited interrupts */ |
1036 | cqr = (struct dasd_ccw_req *) intparm; | |
f3eb5384 SW |
1037 | if (!cqr || ((scsw_cc(&irb->scsw) == 1) && |
1038 | (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) && | |
1039 | (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) { | |
8e09f215 SW |
1040 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
1041 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1042 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1043 | if (!IS_ERR(device)) { |
8e09f215 SW |
1044 | dasd_device_clear_timer(device); |
1045 | device->discipline->handle_unsolicited_interrupt(device, | |
1046 | irb); | |
1da177e4 LT |
1047 | dasd_put_device(device); |
1048 | } | |
1049 | return; | |
1050 | } | |
1051 | ||
8e09f215 SW |
1052 | device = (struct dasd_device *) cqr->startdev; |
1053 | if (!device || | |
1da177e4 | 1054 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 SH |
1055 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid device in request: " |
1056 | "bus_id %s", dev_name(&cdev->dev)); | |
1da177e4 LT |
1057 | return; |
1058 | } | |
1059 | ||
1060 | /* Check for clear pending */ | |
8e09f215 | 1061 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1062 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1063 | cqr->status = DASD_CQR_CLEARED; |
1064 | dasd_device_clear_timer(device); | |
8f61701b | 1065 | wake_up(&dasd_flush_wq); |
8e09f215 | 1066 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1067 | return; |
1068 | } | |
1069 | ||
f3eb5384 | 1070 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1071 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1072 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1073 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1074 | return; |
1075 | } | |
fc19f381 | 1076 | |
8e09f215 | 1077 | next = NULL; |
1da177e4 | 1078 | expires = 0; |
f3eb5384 SW |
1079 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1080 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1081 | /* request was completed successfully */ |
1082 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1083 | cqr->stopclk = now; |
1084 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1085 | if (cqr->devlist.next != &device->ccw_queue) { |
1086 | next = list_entry(cqr->devlist.next, | |
1087 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1088 | } |
8e09f215 SW |
1089 | } else { /* error */ |
1090 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
fc19f381 SH |
1091 | /* log sense for every failed I/O to s390 debugfeature */ |
1092 | dasd_log_sense_dbf(cqr, irb); | |
9575bf26 | 1093 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1094 | dasd_log_sense(cqr, irb); |
1095 | } | |
fc19f381 | 1096 | |
6c5f57c7 SH |
1097 | /* |
1098 | * If we don't want complex ERP for this request, then just | |
1099 | * reset this and retry it in the fastpath | |
8e09f215 | 1100 | */ |
6c5f57c7 | 1101 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1102 | cqr->retries > 0) { |
fc19f381 SH |
1103 | if (cqr->lpm == LPM_ANYPATH) |
1104 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
1105 | "default ERP in fastpath " | |
1106 | "(%i retries left)", | |
1107 | cqr->retries); | |
8e09f215 SW |
1108 | cqr->lpm = LPM_ANYPATH; |
1109 | cqr->status = DASD_CQR_QUEUED; | |
1110 | next = cqr; | |
1111 | } else | |
1da177e4 | 1112 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1113 | } |
1114 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1115 | (!device->stopped)) { | |
1116 | if (device->discipline->start_IO(next) == 0) | |
1117 | expires = next->expires; | |
1da177e4 LT |
1118 | } |
1119 | if (expires != 0) | |
8e09f215 | 1120 | dasd_device_set_timer(device, expires); |
1da177e4 | 1121 | else |
8e09f215 SW |
1122 | dasd_device_clear_timer(device); |
1123 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | /* | |
8e09f215 SW |
1127 | * If we have an error on a dasd_block layer request then we cancel |
1128 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1129 | */ |
8e09f215 SW |
1130 | static void __dasd_device_recovery(struct dasd_device *device, |
1131 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1132 | { |
8e09f215 SW |
1133 | struct list_head *l, *n; |
1134 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1135 | |
8e09f215 SW |
1136 | /* |
1137 | * only requeue request that came from the dasd_block layer | |
1138 | */ | |
1139 | if (!ref_cqr->block) | |
1140 | return; | |
1da177e4 | 1141 | |
8e09f215 SW |
1142 | list_for_each_safe(l, n, &device->ccw_queue) { |
1143 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1144 | if (cqr->status == DASD_CQR_QUEUED && | |
1145 | ref_cqr->block == cqr->block) { | |
1146 | cqr->status = DASD_CQR_CLEARED; | |
1147 | } | |
1148 | } | |
1149 | }; | |
1da177e4 LT |
1150 | |
1151 | /* | |
8e09f215 SW |
1152 | * Remove those ccw requests from the queue that need to be returned |
1153 | * to the upper layer. | |
1da177e4 | 1154 | */ |
8e09f215 SW |
1155 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1156 | struct list_head *final_queue) | |
1da177e4 LT |
1157 | { |
1158 | struct list_head *l, *n; | |
1159 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1160 | |
1da177e4 LT |
1161 | /* Process request with final status. */ |
1162 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1163 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1164 | ||
1da177e4 | 1165 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1166 | if (cqr->status == DASD_CQR_QUEUED || |
1167 | cqr->status == DASD_CQR_IN_IO || | |
1168 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1169 | break; |
1da177e4 | 1170 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1171 | __dasd_device_recovery(device, cqr); |
20c64468 | 1172 | } |
1da177e4 | 1173 | /* Rechain finished requests to final queue */ |
8e09f215 | 1174 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1175 | } |
1176 | } | |
1177 | ||
1da177e4 | 1178 | /* |
8e09f215 SW |
1179 | * the cqrs from the final queue are returned to the upper layer |
1180 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1181 | */ |
8e09f215 SW |
1182 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1183 | struct list_head *final_queue) | |
1da177e4 | 1184 | { |
8e09f215 | 1185 | struct list_head *l, *n; |
1da177e4 | 1186 | struct dasd_ccw_req *cqr; |
03513bcc | 1187 | struct dasd_block *block; |
c80ee724 SH |
1188 | void (*callback)(struct dasd_ccw_req *, void *data); |
1189 | void *callback_data; | |
fc19f381 | 1190 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1191 | |
8e09f215 SW |
1192 | list_for_each_safe(l, n, final_queue) { |
1193 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1194 | list_del_init(&cqr->devlist); | |
03513bcc | 1195 | block = cqr->block; |
c80ee724 SH |
1196 | callback = cqr->callback; |
1197 | callback_data = cqr->callback_data; | |
03513bcc SW |
1198 | if (block) |
1199 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1200 | switch (cqr->status) { |
1201 | case DASD_CQR_SUCCESS: | |
1202 | cqr->status = DASD_CQR_DONE; | |
1203 | break; | |
1204 | case DASD_CQR_ERROR: | |
1205 | cqr->status = DASD_CQR_NEED_ERP; | |
1206 | break; | |
1207 | case DASD_CQR_CLEARED: | |
1208 | cqr->status = DASD_CQR_TERMINATED; | |
1209 | break; | |
1210 | default: | |
fc19f381 SH |
1211 | /* internal error 12 - wrong cqr status*/ |
1212 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1213 | dev_err(&device->cdev->dev, | |
1214 | "An error occurred in the DASD device driver, " | |
1215 | "reason=%s\n", errorstring); | |
8e09f215 | 1216 | BUG(); |
1da177e4 | 1217 | } |
8e09f215 | 1218 | if (cqr->callback != NULL) |
c80ee724 | 1219 | (callback)(cqr, callback_data); |
03513bcc SW |
1220 | if (block) |
1221 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1222 | } |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * Take a look at the first request on the ccw queue and check | |
1227 | * if it reached its expire time. If so, terminate the IO. | |
1228 | */ | |
8e09f215 | 1229 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1230 | { |
1231 | struct dasd_ccw_req *cqr; | |
1232 | ||
1233 | if (list_empty(&device->ccw_queue)) | |
1234 | return; | |
8e09f215 | 1235 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1236 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1237 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1238 | if (device->discipline->term_IO(cqr) != 0) { | |
1239 | /* Hmpf, try again in 5 sec */ | |
fc19f381 SH |
1240 | dev_err(&device->cdev->dev, |
1241 | "cqr %p timed out (%is) but cannot be " | |
1242 | "ended, retrying in 5 s\n", | |
1243 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1244 | cqr->expires += 5*HZ; |
1245 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1246 | } else { |
fc19f381 SH |
1247 | dev_err(&device->cdev->dev, |
1248 | "cqr %p timed out (%is), %i retries " | |
1249 | "remaining\n", cqr, (cqr->expires/HZ), | |
1250 | cqr->retries); | |
1da177e4 LT |
1251 | } |
1252 | } | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Take a look at the first request on the ccw queue and check | |
1257 | * if it needs to be started. | |
1258 | */ | |
8e09f215 | 1259 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1260 | { |
1261 | struct dasd_ccw_req *cqr; | |
1262 | int rc; | |
1263 | ||
1264 | if (list_empty(&device->ccw_queue)) | |
1265 | return; | |
8e09f215 | 1266 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1267 | if (cqr->status != DASD_CQR_QUEUED) |
1268 | return; | |
8e09f215 SW |
1269 | /* when device is stopped, return request to previous layer */ |
1270 | if (device->stopped) { | |
1271 | cqr->status = DASD_CQR_CLEARED; | |
1272 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1273 | return; |
1c01b8a5 | 1274 | } |
25ee4cf8 PO |
1275 | |
1276 | rc = device->discipline->start_IO(cqr); | |
1277 | if (rc == 0) | |
8e09f215 | 1278 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1279 | else if (rc == -EACCES) { |
8e09f215 | 1280 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1281 | } else |
1282 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1283 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1284 | } |
1285 | ||
1da177e4 | 1286 | /* |
8e09f215 SW |
1287 | * Go through all request on the dasd_device request queue, |
1288 | * terminate them on the cdev if necessary, and return them to the | |
1289 | * submitting layer via callback. | |
1290 | * Note: | |
1291 | * Make sure that all 'submitting layers' still exist when | |
1292 | * this function is called!. In other words, when 'device' is a base | |
1293 | * device then all block layer requests must have been removed before | |
1294 | * via dasd_flush_block_queue. | |
1da177e4 | 1295 | */ |
8e09f215 | 1296 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1297 | { |
8e09f215 SW |
1298 | struct dasd_ccw_req *cqr, *n; |
1299 | int rc; | |
1da177e4 | 1300 | struct list_head flush_queue; |
1da177e4 LT |
1301 | |
1302 | INIT_LIST_HEAD(&flush_queue); | |
1303 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1304 | rc = 0; |
8e09f215 | 1305 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1306 | /* Check status and move request to flush_queue */ |
1307 | switch (cqr->status) { | |
1308 | case DASD_CQR_IN_IO: | |
1309 | rc = device->discipline->term_IO(cqr); | |
1310 | if (rc) { | |
1311 | /* unable to terminate requeust */ | |
fc19f381 SH |
1312 | dev_err(&device->cdev->dev, |
1313 | "Flushing the DASD request queue " | |
1314 | "failed for request %p\n", cqr); | |
8f61701b HH |
1315 | /* stop flush processing */ |
1316 | goto finished; | |
1317 | } | |
1318 | break; | |
1319 | case DASD_CQR_QUEUED: | |
1da177e4 | 1320 | cqr->stopclk = get_clock(); |
8e09f215 | 1321 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1322 | break; |
8e09f215 | 1323 | default: /* no need to modify the others */ |
8f61701b HH |
1324 | break; |
1325 | } | |
8e09f215 | 1326 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1327 | } |
8f61701b HH |
1328 | finished: |
1329 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1330 | /* |
1331 | * After this point all requests must be in state CLEAR_PENDING, | |
1332 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1333 | * one of the others. | |
1334 | */ | |
1335 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1336 | wait_event(dasd_flush_wq, | |
1337 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1338 | /* | |
1339 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1340 | * and call the callback function of flushed requests | |
1341 | */ | |
1342 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1343 | return rc; |
1da177e4 LT |
1344 | } |
1345 | ||
1346 | /* | |
1347 | * Acquire the device lock and process queues for the device. | |
1348 | */ | |
8e09f215 | 1349 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1350 | { |
1351 | struct list_head final_queue; | |
1da177e4 LT |
1352 | |
1353 | atomic_set (&device->tasklet_scheduled, 0); | |
1354 | INIT_LIST_HEAD(&final_queue); | |
1355 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1356 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1357 | __dasd_device_check_expire(device); |
1358 | /* find final requests on ccw queue */ | |
1359 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1360 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1361 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1362 | __dasd_device_process_final_queue(device, &final_queue); |
1363 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1364 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1365 | __dasd_device_start_head(device); |
1366 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1367 | dasd_put_device(device); |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1372 | */ | |
8e09f215 | 1373 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1374 | { |
1375 | /* Protect against rescheduling. */ | |
973bd993 | 1376 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1377 | return; |
1378 | dasd_get_device(device); | |
1379 | tasklet_hi_schedule(&device->tasklet); | |
1380 | } | |
1381 | ||
1382 | /* | |
8e09f215 SW |
1383 | * Queue a request to the head of the device ccw_queue. |
1384 | * Start the I/O if possible. | |
1da177e4 | 1385 | */ |
8e09f215 | 1386 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1387 | { |
1388 | struct dasd_device *device; | |
1389 | unsigned long flags; | |
1390 | ||
8e09f215 | 1391 | device = cqr->startdev; |
1da177e4 | 1392 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1393 | cqr->status = DASD_CQR_QUEUED; |
1394 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1395 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1396 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1397 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1398 | } | |
1399 | ||
1400 | /* | |
8e09f215 SW |
1401 | * Queue a request to the tail of the device ccw_queue. |
1402 | * Start the I/O if possible. | |
1da177e4 | 1403 | */ |
8e09f215 | 1404 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1405 | { |
1406 | struct dasd_device *device; | |
1407 | unsigned long flags; | |
1408 | ||
8e09f215 | 1409 | device = cqr->startdev; |
1da177e4 | 1410 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1411 | cqr->status = DASD_CQR_QUEUED; |
1412 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1413 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1414 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1415 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1416 | } | |
1417 | ||
1418 | /* | |
8e09f215 | 1419 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1420 | */ |
8e09f215 | 1421 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 LT |
1422 | { |
1423 | wake_up((wait_queue_head_t *) data); | |
1424 | } | |
1425 | ||
8e09f215 | 1426 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1427 | { |
1428 | struct dasd_device *device; | |
1429 | int rc; | |
1430 | ||
8e09f215 | 1431 | device = cqr->startdev; |
1da177e4 | 1432 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
c2ba444d | 1433 | rc = ((cqr->status == DASD_CQR_DONE || |
8e09f215 SW |
1434 | cqr->status == DASD_CQR_NEED_ERP || |
1435 | cqr->status == DASD_CQR_TERMINATED) && | |
1436 | list_empty(&cqr->devlist)); | |
1da177e4 LT |
1437 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1438 | return rc; | |
1439 | } | |
1440 | ||
1441 | /* | |
8e09f215 SW |
1442 | * Queue a request to the tail of the device ccw_queue and wait for |
1443 | * it's completion. | |
1da177e4 | 1444 | */ |
8e09f215 | 1445 | int dasd_sleep_on(struct dasd_ccw_req *cqr) |
1da177e4 | 1446 | { |
1da177e4 LT |
1447 | struct dasd_device *device; |
1448 | int rc; | |
138c014d | 1449 | |
8e09f215 | 1450 | device = cqr->startdev; |
138c014d | 1451 | |
1da177e4 | 1452 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1453 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1454 | dasd_add_request_tail(cqr); |
c80ee724 | 1455 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1456 | |
1da177e4 | 1457 | /* Request status is either done or failed. */ |
8e09f215 | 1458 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1459 | return rc; |
1460 | } | |
1461 | ||
1462 | /* | |
8e09f215 SW |
1463 | * Queue a request to the tail of the device ccw_queue and wait |
1464 | * interruptible for it's completion. | |
1da177e4 | 1465 | */ |
8e09f215 | 1466 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1467 | { |
1da177e4 | 1468 | struct dasd_device *device; |
8e09f215 | 1469 | int rc; |
1da177e4 | 1470 | |
8e09f215 | 1471 | device = cqr->startdev; |
1da177e4 | 1472 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1473 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1474 | dasd_add_request_tail(cqr); |
c80ee724 | 1475 | rc = wait_event_interruptible(generic_waitq, _wait_for_wakeup(cqr)); |
8e09f215 SW |
1476 | if (rc == -ERESTARTSYS) { |
1477 | dasd_cancel_req(cqr); | |
1478 | /* wait (non-interruptible) for final status */ | |
c80ee724 | 1479 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
1da177e4 | 1480 | } |
8e09f215 | 1481 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1482 | return rc; |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1487 | * for eckd devices) the currently running request has to be terminated | |
1488 | * and be put back to status queued, before the special request is added | |
1489 | * to the head of the queue. Then the special request is waited on normally. | |
1490 | */ | |
8e09f215 | 1491 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1492 | { |
1493 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1494 | |
1495 | if (list_empty(&device->ccw_queue)) | |
1496 | return 0; | |
8e09f215 | 1497 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1498 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1499 | } |
1500 | ||
8e09f215 | 1501 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1502 | { |
1da177e4 LT |
1503 | struct dasd_device *device; |
1504 | int rc; | |
138c014d | 1505 | |
8e09f215 | 1506 | device = cqr->startdev; |
1da177e4 LT |
1507 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1508 | rc = _dasd_term_running_cqr(device); | |
1509 | if (rc) { | |
1510 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1511 | return rc; | |
1512 | } | |
138c014d | 1513 | |
1da177e4 | 1514 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1515 | cqr->callback_data = (void *) &generic_waitq; |
1da177e4 | 1516 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1517 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1518 | |
1da177e4 | 1519 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1520 | dasd_schedule_device_bh(device); |
138c014d | 1521 | |
1da177e4 LT |
1522 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1523 | ||
c80ee724 | 1524 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1525 | |
1da177e4 | 1526 | /* Request status is either done or failed. */ |
8e09f215 | 1527 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1528 | return rc; |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * Cancels a request that was started with dasd_sleep_on_req. | |
1533 | * This is useful to timeout requests. The request will be | |
1534 | * terminated if it is currently in i/o. | |
1535 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1536 | * 0 if there was no need to terminate the request (not started yet) |
1537 | * negative error code if termination failed | |
1538 | * Cancellation of a request is an asynchronous operation! The calling | |
1539 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1540 | */ |
8e09f215 | 1541 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1542 | { |
8e09f215 | 1543 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1544 | unsigned long flags; |
1545 | int rc; | |
1546 | ||
1547 | rc = 0; | |
1548 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1549 | switch (cqr->status) { | |
1550 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1551 | /* request was not started - just set to cleared */ |
1552 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1553 | break; |
1554 | case DASD_CQR_IN_IO: | |
1555 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1556 | rc = device->discipline->term_IO(cqr); |
1557 | if (rc) { | |
fc19f381 SH |
1558 | dev_err(&device->cdev->dev, |
1559 | "Cancelling request %p failed with rc=%d\n", | |
1560 | cqr, rc); | |
8e09f215 SW |
1561 | } else { |
1562 | cqr->stopclk = get_clock(); | |
1563 | rc = 1; | |
1564 | } | |
1da177e4 | 1565 | break; |
8e09f215 | 1566 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1567 | break; |
8e09f215 SW |
1568 | } |
1569 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1570 | dasd_schedule_device_bh(device); | |
1571 | return rc; | |
1572 | } | |
1573 | ||
1574 | ||
1575 | /* | |
1576 | * SECTION: Operations of the dasd_block layer. | |
1577 | */ | |
1578 | ||
1579 | /* | |
1580 | * Timeout function for dasd_block. This is used when the block layer | |
1581 | * is waiting for something that may not come reliably, (e.g. a state | |
1582 | * change interrupt) | |
1583 | */ | |
1584 | static void dasd_block_timeout(unsigned long ptr) | |
1585 | { | |
1586 | unsigned long flags; | |
1587 | struct dasd_block *block; | |
1588 | ||
1589 | block = (struct dasd_block *) ptr; | |
1590 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1591 | /* re-activate request queue */ | |
1592 | block->base->stopped &= ~DASD_STOPPED_PENDING; | |
1593 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); | |
1594 | dasd_schedule_block_bh(block); | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * Setup timeout for a dasd_block in jiffies. | |
1599 | */ | |
1600 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1601 | { | |
48cae885 SW |
1602 | if (expires == 0) |
1603 | del_timer(&block->timer); | |
1604 | else | |
1605 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 SW |
1606 | } |
1607 | ||
1608 | /* | |
1609 | * Clear timeout for a dasd_block. | |
1610 | */ | |
1611 | void dasd_block_clear_timer(struct dasd_block *block) | |
1612 | { | |
48cae885 | 1613 | del_timer(&block->timer); |
8e09f215 SW |
1614 | } |
1615 | ||
8e09f215 SW |
1616 | /* |
1617 | * Process finished error recovery ccw. | |
1618 | */ | |
1619 | static inline void __dasd_block_process_erp(struct dasd_block *block, | |
1620 | struct dasd_ccw_req *cqr) | |
1621 | { | |
1622 | dasd_erp_fn_t erp_fn; | |
1623 | struct dasd_device *device = block->base; | |
1624 | ||
1625 | if (cqr->status == DASD_CQR_DONE) | |
1626 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1627 | else | |
fc19f381 | 1628 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
1629 | erp_fn = device->discipline->erp_postaction(cqr); |
1630 | erp_fn(cqr); | |
1631 | } | |
1da177e4 | 1632 | |
8e09f215 SW |
1633 | /* |
1634 | * Fetch requests from the block device queue. | |
1635 | */ | |
1636 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1637 | { | |
1638 | struct request_queue *queue; | |
1639 | struct request *req; | |
1640 | struct dasd_ccw_req *cqr; | |
1641 | struct dasd_device *basedev; | |
1642 | unsigned long flags; | |
1643 | queue = block->request_queue; | |
1644 | basedev = block->base; | |
1645 | /* No queue ? Then there is nothing to do. */ | |
1646 | if (queue == NULL) | |
1647 | return; | |
1648 | ||
1649 | /* | |
1650 | * We requeue request from the block device queue to the ccw | |
1651 | * queue only in two states. In state DASD_STATE_READY the | |
1652 | * partition detection is done and we need to requeue requests | |
1653 | * for that. State DASD_STATE_ONLINE is normal block device | |
1654 | * operation. | |
1655 | */ | |
1656 | if (basedev->state < DASD_STATE_READY) | |
1657 | return; | |
1658 | /* Now we try to fetch requests from the request queue */ | |
9934c8c0 | 1659 | while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) { |
8e09f215 SW |
1660 | if (basedev->features & DASD_FEATURE_READONLY && |
1661 | rq_data_dir(req) == WRITE) { | |
1662 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1663 | "Rejecting write request %p", | |
1664 | req); | |
9934c8c0 | 1665 | blk_start_request(req); |
40cbbb78 | 1666 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1667 | continue; |
1668 | } | |
1669 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1670 | if (IS_ERR(cqr)) { | |
1671 | if (PTR_ERR(cqr) == -EBUSY) | |
1672 | break; /* normal end condition */ | |
1673 | if (PTR_ERR(cqr) == -ENOMEM) | |
1674 | break; /* terminate request queue loop */ | |
1675 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1676 | /* | |
1677 | * The current request cannot be build right | |
1678 | * now, we have to try later. If this request | |
1679 | * is the head-of-queue we stop the device | |
1680 | * for 1/2 second. | |
1681 | */ | |
1682 | if (!list_empty(&block->ccw_queue)) | |
1683 | break; | |
1684 | spin_lock_irqsave(get_ccwdev_lock(basedev->cdev), flags); | |
1685 | basedev->stopped |= DASD_STOPPED_PENDING; | |
1686 | spin_unlock_irqrestore(get_ccwdev_lock(basedev->cdev), flags); | |
1687 | dasd_block_set_timer(block, HZ/2); | |
1688 | break; | |
1689 | } | |
1690 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1691 | "CCW creation failed (rc=%ld) " | |
1692 | "on request %p", | |
1693 | PTR_ERR(cqr), req); | |
9934c8c0 | 1694 | blk_start_request(req); |
40cbbb78 | 1695 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1696 | continue; |
1697 | } | |
1698 | /* | |
1699 | * Note: callback is set to dasd_return_cqr_cb in | |
1700 | * __dasd_block_start_head to cover erp requests as well | |
1701 | */ | |
1702 | cqr->callback_data = (void *) req; | |
1703 | cqr->status = DASD_CQR_FILLED; | |
9934c8c0 | 1704 | blk_start_request(req); |
8e09f215 SW |
1705 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
1706 | dasd_profile_start(block, cqr, req); | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1711 | { | |
1712 | struct request *req; | |
1713 | int status; | |
4c4e2148 | 1714 | int error = 0; |
8e09f215 SW |
1715 | |
1716 | req = (struct request *) cqr->callback_data; | |
1717 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1718 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1719 | if (status <= 0) |
1720 | error = status ? status : -EIO; | |
40cbbb78 | 1721 | __blk_end_request_all(req, error); |
8e09f215 SW |
1722 | } |
1723 | ||
1724 | /* | |
1725 | * Process ccw request queue. | |
1726 | */ | |
1727 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1728 | struct list_head *final_queue) | |
1729 | { | |
1730 | struct list_head *l, *n; | |
1731 | struct dasd_ccw_req *cqr; | |
1732 | dasd_erp_fn_t erp_fn; | |
1733 | unsigned long flags; | |
1734 | struct dasd_device *base = block->base; | |
1735 | ||
1736 | restart: | |
1737 | /* Process request with final status. */ | |
1738 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1739 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1740 | if (cqr->status != DASD_CQR_DONE && | |
1741 | cqr->status != DASD_CQR_FAILED && | |
1742 | cqr->status != DASD_CQR_NEED_ERP && | |
1743 | cqr->status != DASD_CQR_TERMINATED) | |
1744 | continue; | |
1745 | ||
1746 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1747 | base->discipline->handle_terminated_request(cqr); | |
1748 | goto restart; | |
1749 | } | |
1750 | ||
1751 | /* Process requests that may be recovered */ | |
1752 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 SH |
1753 | erp_fn = base->discipline->erp_action(cqr); |
1754 | erp_fn(cqr); | |
8e09f215 SW |
1755 | goto restart; |
1756 | } | |
1757 | ||
a9cffb22 SH |
1758 | /* log sense for fatal error */ |
1759 | if (cqr->status == DASD_CQR_FAILED) { | |
1760 | dasd_log_sense(cqr, &cqr->irb); | |
1761 | } | |
1762 | ||
8e09f215 SW |
1763 | /* First of all call extended error reporting. */ |
1764 | if (dasd_eer_enabled(base) && | |
1765 | cqr->status == DASD_CQR_FAILED) { | |
1766 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1767 | ||
1768 | /* restart request */ | |
1769 | cqr->status = DASD_CQR_FILLED; | |
1770 | cqr->retries = 255; | |
1771 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
1772 | base->stopped |= DASD_STOPPED_QUIESCE; | |
1773 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), | |
1774 | flags); | |
1775 | goto restart; | |
1776 | } | |
1777 | ||
1778 | /* Process finished ERP request. */ | |
1779 | if (cqr->refers) { | |
1780 | __dasd_block_process_erp(block, cqr); | |
1781 | goto restart; | |
1782 | } | |
1783 | ||
1784 | /* Rechain finished requests to final queue */ | |
1785 | cqr->endclk = get_clock(); | |
1786 | list_move_tail(&cqr->blocklist, final_queue); | |
1787 | } | |
1788 | } | |
1789 | ||
1790 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1791 | { | |
1792 | dasd_schedule_block_bh(cqr->block); | |
1793 | } | |
1794 | ||
1795 | static void __dasd_block_start_head(struct dasd_block *block) | |
1796 | { | |
1797 | struct dasd_ccw_req *cqr; | |
1798 | ||
1799 | if (list_empty(&block->ccw_queue)) | |
1800 | return; | |
1801 | /* We allways begin with the first requests on the queue, as some | |
1802 | * of previously started requests have to be enqueued on a | |
1803 | * dasd_device again for error recovery. | |
1804 | */ | |
1805 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1806 | if (cqr->status != DASD_CQR_FILLED) | |
1807 | continue; | |
1808 | /* Non-temporary stop condition will trigger fail fast */ | |
1809 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1810 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1811 | (!dasd_eer_enabled(block->base))) { | |
1812 | cqr->status = DASD_CQR_FAILED; | |
1813 | dasd_schedule_block_bh(block); | |
1814 | continue; | |
1815 | } | |
1816 | /* Don't try to start requests if device is stopped */ | |
1817 | if (block->base->stopped) | |
1818 | return; | |
1819 | ||
1820 | /* just a fail safe check, should not happen */ | |
1821 | if (!cqr->startdev) | |
1822 | cqr->startdev = block->base; | |
1823 | ||
1824 | /* make sure that the requests we submit find their way back */ | |
1825 | cqr->callback = dasd_return_cqr_cb; | |
1826 | ||
1827 | dasd_add_request_tail(cqr); | |
1828 | } | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Central dasd_block layer routine. Takes requests from the generic | |
1833 | * block layer request queue, creates ccw requests, enqueues them on | |
1834 | * a dasd_device and processes ccw requests that have been returned. | |
1835 | */ | |
1836 | static void dasd_block_tasklet(struct dasd_block *block) | |
1837 | { | |
1838 | struct list_head final_queue; | |
1839 | struct list_head *l, *n; | |
1840 | struct dasd_ccw_req *cqr; | |
1841 | ||
1842 | atomic_set(&block->tasklet_scheduled, 0); | |
1843 | INIT_LIST_HEAD(&final_queue); | |
1844 | spin_lock(&block->queue_lock); | |
1845 | /* Finish off requests on ccw queue */ | |
1846 | __dasd_process_block_ccw_queue(block, &final_queue); | |
1847 | spin_unlock(&block->queue_lock); | |
1848 | /* Now call the callback function of requests with final status */ | |
1849 | spin_lock_irq(&block->request_queue_lock); | |
1850 | list_for_each_safe(l, n, &final_queue) { | |
1851 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1852 | list_del_init(&cqr->blocklist); | |
1853 | __dasd_cleanup_cqr(cqr); | |
1854 | } | |
1855 | spin_lock(&block->queue_lock); | |
1856 | /* Get new request from the block device request queue */ | |
1857 | __dasd_process_request_queue(block); | |
1858 | /* Now check if the head of the ccw queue needs to be started. */ | |
1859 | __dasd_block_start_head(block); | |
1860 | spin_unlock(&block->queue_lock); | |
1861 | spin_unlock_irq(&block->request_queue_lock); | |
1862 | dasd_put_device(block->base); | |
1863 | } | |
1864 | ||
1865 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
1866 | { | |
1867 | wake_up(&dasd_flush_wq); | |
1868 | } | |
1869 | ||
1870 | /* | |
1871 | * Go through all request on the dasd_block request queue, cancel them | |
1872 | * on the respective dasd_device, and return them to the generic | |
1873 | * block layer. | |
1874 | */ | |
1875 | static int dasd_flush_block_queue(struct dasd_block *block) | |
1876 | { | |
1877 | struct dasd_ccw_req *cqr, *n; | |
1878 | int rc, i; | |
1879 | struct list_head flush_queue; | |
1880 | ||
1881 | INIT_LIST_HEAD(&flush_queue); | |
1882 | spin_lock_bh(&block->queue_lock); | |
1883 | rc = 0; | |
1884 | restart: | |
1885 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
1886 | /* if this request currently owned by a dasd_device cancel it */ | |
1887 | if (cqr->status >= DASD_CQR_QUEUED) | |
1888 | rc = dasd_cancel_req(cqr); | |
1889 | if (rc < 0) | |
1890 | break; | |
1891 | /* Rechain request (including erp chain) so it won't be | |
1892 | * touched by the dasd_block_tasklet anymore. | |
1893 | * Replace the callback so we notice when the request | |
1894 | * is returned from the dasd_device layer. | |
1895 | */ | |
1896 | cqr->callback = _dasd_wake_block_flush_cb; | |
1897 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
1898 | list_move_tail(&cqr->blocklist, &flush_queue); | |
1899 | if (i > 1) | |
1900 | /* moved more than one request - need to restart */ | |
1901 | goto restart; | |
1902 | } | |
1903 | spin_unlock_bh(&block->queue_lock); | |
1904 | /* Now call the callback function of flushed requests */ | |
1905 | restart_cb: | |
1906 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
1907 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
1908 | /* Process finished ERP request. */ | |
1909 | if (cqr->refers) { | |
0cd4bd47 | 1910 | spin_lock_bh(&block->queue_lock); |
8e09f215 | 1911 | __dasd_block_process_erp(block, cqr); |
0cd4bd47 | 1912 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
1913 | /* restart list_for_xx loop since dasd_process_erp |
1914 | * might remove multiple elements */ | |
1915 | goto restart_cb; | |
1916 | } | |
1917 | /* call the callback function */ | |
0cd4bd47 | 1918 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
1919 | cqr->endclk = get_clock(); |
1920 | list_del_init(&cqr->blocklist); | |
1921 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 1922 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 1923 | } |
1da177e4 LT |
1924 | return rc; |
1925 | } | |
1926 | ||
1927 | /* | |
8e09f215 SW |
1928 | * Schedules a call to dasd_tasklet over the device tasklet. |
1929 | */ | |
1930 | void dasd_schedule_block_bh(struct dasd_block *block) | |
1931 | { | |
1932 | /* Protect against rescheduling. */ | |
1933 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
1934 | return; | |
1935 | /* life cycle of block is bound to it's base device */ | |
1936 | dasd_get_device(block->base); | |
1937 | tasklet_hi_schedule(&block->tasklet); | |
1938 | } | |
1939 | ||
1940 | ||
1941 | /* | |
1942 | * SECTION: external block device operations | |
1943 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
1944 | */ |
1945 | ||
1946 | /* | |
1947 | * Dasd request queue function. Called from ll_rw_blk.c | |
1948 | */ | |
8e09f215 | 1949 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 1950 | { |
8e09f215 | 1951 | struct dasd_block *block; |
1da177e4 | 1952 | |
8e09f215 SW |
1953 | block = queue->queuedata; |
1954 | spin_lock(&block->queue_lock); | |
1da177e4 | 1955 | /* Get new request from the block device request queue */ |
8e09f215 | 1956 | __dasd_process_request_queue(block); |
1da177e4 | 1957 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1958 | __dasd_block_start_head(block); |
1959 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
1960 | } |
1961 | ||
1962 | /* | |
1963 | * Allocate and initialize request queue and default I/O scheduler. | |
1964 | */ | |
8e09f215 | 1965 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
1966 | { |
1967 | int rc; | |
1968 | ||
8e09f215 SW |
1969 | block->request_queue = blk_init_queue(do_dasd_request, |
1970 | &block->request_queue_lock); | |
1971 | if (block->request_queue == NULL) | |
1da177e4 LT |
1972 | return -ENOMEM; |
1973 | ||
8e09f215 | 1974 | block->request_queue->queuedata = block; |
1da177e4 | 1975 | |
8e09f215 | 1976 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 1977 | block->request_queue->elevator = NULL; |
8e09f215 | 1978 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 1979 | if (rc) { |
8e09f215 | 1980 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
1981 | return rc; |
1982 | } | |
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | /* | |
1987 | * Allocate and initialize request queue. | |
1988 | */ | |
8e09f215 | 1989 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
1990 | { |
1991 | int max; | |
1992 | ||
e1defc4f | 1993 | blk_queue_logical_block_size(block->request_queue, block->bp_block); |
8e09f215 SW |
1994 | max = block->base->discipline->max_blocks << block->s2b_shift; |
1995 | blk_queue_max_sectors(block->request_queue, max); | |
1996 | blk_queue_max_phys_segments(block->request_queue, -1L); | |
1997 | blk_queue_max_hw_segments(block->request_queue, -1L); | |
f3eb5384 SW |
1998 | /* with page sized segments we can translate each segement into |
1999 | * one idaw/tidaw | |
2000 | */ | |
2001 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
2002 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
8e09f215 | 2003 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); |
1da177e4 LT |
2004 | } |
2005 | ||
2006 | /* | |
2007 | * Deactivate and free request queue. | |
2008 | */ | |
8e09f215 | 2009 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2010 | { |
8e09f215 SW |
2011 | if (block->request_queue) { |
2012 | blk_cleanup_queue(block->request_queue); | |
2013 | block->request_queue = NULL; | |
1da177e4 LT |
2014 | } |
2015 | } | |
2016 | ||
2017 | /* | |
2018 | * Flush request on the request queue. | |
2019 | */ | |
8e09f215 | 2020 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2021 | { |
2022 | struct request *req; | |
2023 | ||
8e09f215 | 2024 | if (!block->request_queue) |
1da177e4 | 2025 | return; |
138c014d | 2026 | |
8e09f215 | 2027 | spin_lock_irq(&block->request_queue_lock); |
9934c8c0 | 2028 | while ((req = blk_fetch_request(block->request_queue))) |
40cbbb78 | 2029 | __blk_end_request_all(req, -EIO); |
8e09f215 | 2030 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2031 | } |
2032 | ||
57a7c0bc | 2033 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2034 | { |
57a7c0bc | 2035 | struct dasd_block *block = bdev->bd_disk->private_data; |
8e09f215 | 2036 | struct dasd_device *base = block->base; |
1da177e4 LT |
2037 | int rc; |
2038 | ||
8e09f215 SW |
2039 | atomic_inc(&block->open_count); |
2040 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2041 | rc = -ENODEV; |
2042 | goto unlock; | |
2043 | } | |
2044 | ||
8e09f215 | 2045 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2046 | rc = -EINVAL; |
2047 | goto unlock; | |
2048 | } | |
2049 | ||
2050 | if (dasd_probeonly) { | |
fc19f381 SH |
2051 | dev_info(&base->cdev->dev, |
2052 | "Accessing the DASD failed because it is in " | |
2053 | "probeonly mode\n"); | |
1da177e4 LT |
2054 | rc = -EPERM; |
2055 | goto out; | |
2056 | } | |
2057 | ||
8e09f215 SW |
2058 | if (base->state <= DASD_STATE_BASIC) { |
2059 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2060 | " Cannot open unrecognized device"); |
2061 | rc = -ENODEV; | |
2062 | goto out; | |
2063 | } | |
2064 | ||
2065 | return 0; | |
2066 | ||
2067 | out: | |
8e09f215 | 2068 | module_put(base->discipline->owner); |
1da177e4 | 2069 | unlock: |
8e09f215 | 2070 | atomic_dec(&block->open_count); |
1da177e4 LT |
2071 | return rc; |
2072 | } | |
2073 | ||
57a7c0bc | 2074 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2075 | { |
8e09f215 | 2076 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2077 | |
8e09f215 SW |
2078 | atomic_dec(&block->open_count); |
2079 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2080 | return 0; |
2081 | } | |
2082 | ||
a885c8c4 CH |
2083 | /* |
2084 | * Return disk geometry. | |
2085 | */ | |
8e09f215 | 2086 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2087 | { |
8e09f215 SW |
2088 | struct dasd_block *block; |
2089 | struct dasd_device *base; | |
a885c8c4 | 2090 | |
8e09f215 SW |
2091 | block = bdev->bd_disk->private_data; |
2092 | base = block->base; | |
2093 | if (!block) | |
a885c8c4 CH |
2094 | return -ENODEV; |
2095 | ||
8e09f215 SW |
2096 | if (!base->discipline || |
2097 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2098 | return -EINVAL; |
2099 | ||
8e09f215 SW |
2100 | base->discipline->fill_geometry(block, geo); |
2101 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2102 | return 0; |
2103 | } | |
2104 | ||
1da177e4 LT |
2105 | struct block_device_operations |
2106 | dasd_device_operations = { | |
2107 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2108 | .open = dasd_open, |
2109 | .release = dasd_release, | |
0000d031 HC |
2110 | .ioctl = dasd_ioctl, |
2111 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 2112 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2113 | }; |
2114 | ||
8e09f215 SW |
2115 | /******************************************************************************* |
2116 | * end of block device operations | |
2117 | */ | |
1da177e4 LT |
2118 | |
2119 | static void | |
2120 | dasd_exit(void) | |
2121 | { | |
2122 | #ifdef CONFIG_PROC_FS | |
2123 | dasd_proc_exit(); | |
2124 | #endif | |
20c64468 | 2125 | dasd_eer_exit(); |
6bb0e010 HH |
2126 | if (dasd_page_cache != NULL) { |
2127 | kmem_cache_destroy(dasd_page_cache); | |
2128 | dasd_page_cache = NULL; | |
2129 | } | |
1da177e4 LT |
2130 | dasd_gendisk_exit(); |
2131 | dasd_devmap_exit(); | |
1da177e4 LT |
2132 | if (dasd_debug_area != NULL) { |
2133 | debug_unregister(dasd_debug_area); | |
2134 | dasd_debug_area = NULL; | |
2135 | } | |
2136 | } | |
2137 | ||
2138 | /* | |
2139 | * SECTION: common functions for ccw_driver use | |
2140 | */ | |
2141 | ||
f3445a1a CH |
2142 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
2143 | { | |
2144 | struct ccw_device *cdev = data; | |
2145 | int ret; | |
2146 | ||
2147 | ret = ccw_device_set_online(cdev); | |
2148 | if (ret) | |
2149 | pr_warning("%s: Setting the DASD online failed with rc=%d\n", | |
2150 | dev_name(&cdev->dev), ret); | |
2151 | else { | |
2152 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2153 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2154 | dasd_put_device(device); | |
2155 | } | |
2156 | } | |
2157 | ||
1c01b8a5 HH |
2158 | /* |
2159 | * Initial attempt at a probe function. this can be simplified once | |
2160 | * the other detection code is gone. | |
2161 | */ | |
8e09f215 SW |
2162 | int dasd_generic_probe(struct ccw_device *cdev, |
2163 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2164 | { |
2165 | int ret; | |
2166 | ||
40545573 HH |
2167 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
2168 | if (ret) { | |
fc19f381 | 2169 | DBF_EVENT(DBF_WARNING, |
40545573 | 2170 | "dasd_generic_probe: could not set ccw-device options " |
2a0217d5 | 2171 | "for %s\n", dev_name(&cdev->dev)); |
40545573 HH |
2172 | return ret; |
2173 | } | |
1da177e4 LT |
2174 | ret = dasd_add_sysfs_files(cdev); |
2175 | if (ret) { | |
fc19f381 | 2176 | DBF_EVENT(DBF_WARNING, |
1da177e4 | 2177 | "dasd_generic_probe: could not add sysfs entries " |
2a0217d5 | 2178 | "for %s\n", dev_name(&cdev->dev)); |
40545573 | 2179 | return ret; |
1da177e4 | 2180 | } |
40545573 | 2181 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2182 | |
40545573 HH |
2183 | /* |
2184 | * Automatically online either all dasd devices (dasd_autodetect) | |
2185 | * or all devices specified with dasd= parameters during | |
2186 | * initial probe. | |
2187 | */ | |
2188 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2189 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 2190 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 2191 | return 0; |
1da177e4 LT |
2192 | } |
2193 | ||
1c01b8a5 HH |
2194 | /* |
2195 | * This will one day be called from a global not_oper handler. | |
2196 | * It is also used by driver_unregister during module unload. | |
2197 | */ | |
8e09f215 | 2198 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2199 | { |
2200 | struct dasd_device *device; | |
8e09f215 | 2201 | struct dasd_block *block; |
1da177e4 | 2202 | |
59afda78 HH |
2203 | cdev->handler = NULL; |
2204 | ||
1da177e4 LT |
2205 | dasd_remove_sysfs_files(cdev); |
2206 | device = dasd_device_from_cdev(cdev); | |
2207 | if (IS_ERR(device)) | |
2208 | return; | |
2209 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2210 | /* Already doing offline processing */ | |
2211 | dasd_put_device(device); | |
2212 | return; | |
2213 | } | |
2214 | /* | |
2215 | * This device is removed unconditionally. Set offline | |
2216 | * flag to prevent dasd_open from opening it while it is | |
2217 | * no quite down yet. | |
2218 | */ | |
2219 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2220 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2221 | block = device->block; |
2222 | device->block = NULL; | |
1da177e4 | 2223 | dasd_delete_device(device); |
8e09f215 SW |
2224 | /* |
2225 | * life cycle of block is bound to device, so delete it after | |
2226 | * device was safely removed | |
2227 | */ | |
2228 | if (block) | |
2229 | dasd_free_block(block); | |
1da177e4 LT |
2230 | } |
2231 | ||
1c01b8a5 HH |
2232 | /* |
2233 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2234 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2235 | * or the user has started activation through sysfs. |
2236 | */ | |
8e09f215 SW |
2237 | int dasd_generic_set_online(struct ccw_device *cdev, |
2238 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2239 | { |
aa88861f | 2240 | struct dasd_discipline *discipline; |
1da177e4 | 2241 | struct dasd_device *device; |
c6eb7b77 | 2242 | int rc; |
f24acd45 | 2243 | |
40545573 HH |
2244 | /* first online clears initial online feature flag */ |
2245 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2246 | device = dasd_create_device(cdev); |
2247 | if (IS_ERR(device)) | |
2248 | return PTR_ERR(device); | |
2249 | ||
aa88861f | 2250 | discipline = base_discipline; |
c6eb7b77 | 2251 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 2252 | if (!dasd_diag_discipline_pointer) { |
fc19f381 SH |
2253 | pr_warning("%s Setting the DASD online failed because " |
2254 | "of missing DIAG discipline\n", | |
2255 | dev_name(&cdev->dev)); | |
1da177e4 LT |
2256 | dasd_delete_device(device); |
2257 | return -ENODEV; | |
2258 | } | |
2259 | discipline = dasd_diag_discipline_pointer; | |
2260 | } | |
aa88861f PO |
2261 | if (!try_module_get(base_discipline->owner)) { |
2262 | dasd_delete_device(device); | |
2263 | return -EINVAL; | |
2264 | } | |
2265 | if (!try_module_get(discipline->owner)) { | |
2266 | module_put(base_discipline->owner); | |
2267 | dasd_delete_device(device); | |
2268 | return -EINVAL; | |
2269 | } | |
2270 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2271 | device->discipline = discipline; |
2272 | ||
8e09f215 | 2273 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2274 | rc = discipline->check_device(device); |
2275 | if (rc) { | |
fc19f381 SH |
2276 | pr_warning("%s Setting the DASD online with discipline %s " |
2277 | "failed with rc=%i\n", | |
2278 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
2279 | module_put(discipline->owner); |
2280 | module_put(base_discipline->owner); | |
1da177e4 LT |
2281 | dasd_delete_device(device); |
2282 | return rc; | |
2283 | } | |
2284 | ||
2285 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2286 | if (device->state <= DASD_STATE_KNOWN) { | |
fc19f381 SH |
2287 | pr_warning("%s Setting the DASD online failed because of a " |
2288 | "missing discipline\n", dev_name(&cdev->dev)); | |
1da177e4 LT |
2289 | rc = -ENODEV; |
2290 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2291 | if (device->block) |
2292 | dasd_free_block(device->block); | |
1da177e4 LT |
2293 | dasd_delete_device(device); |
2294 | } else | |
2295 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2296 | dev_name(&cdev->dev)); |
1da177e4 | 2297 | dasd_put_device(device); |
1da177e4 LT |
2298 | return rc; |
2299 | } | |
2300 | ||
8e09f215 | 2301 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2302 | { |
2303 | struct dasd_device *device; | |
8e09f215 | 2304 | struct dasd_block *block; |
dafd87aa | 2305 | int max_count, open_count; |
1da177e4 LT |
2306 | |
2307 | device = dasd_device_from_cdev(cdev); | |
2308 | if (IS_ERR(device)) | |
2309 | return PTR_ERR(device); | |
2310 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2311 | /* Already doing offline processing */ | |
2312 | dasd_put_device(device); | |
2313 | return 0; | |
2314 | } | |
2315 | /* | |
2316 | * We must make sure that this device is currently not in use. | |
2317 | * The open_count is increased for every opener, that includes | |
2318 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2319 | * in the other openers. | |
2320 | */ | |
8e09f215 | 2321 | if (device->block) { |
a806170e HC |
2322 | max_count = device->block->bdev ? 0 : -1; |
2323 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2324 | if (open_count > max_count) { |
2325 | if (open_count > 0) | |
fc19f381 SH |
2326 | pr_warning("%s: The DASD cannot be set offline " |
2327 | "with open count %i\n", | |
2328 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 2329 | else |
fc19f381 SH |
2330 | pr_warning("%s: The DASD cannot be set offline " |
2331 | "while it is in use\n", | |
2332 | dev_name(&cdev->dev)); | |
8e09f215 SW |
2333 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2334 | dasd_put_device(device); | |
2335 | return -EBUSY; | |
2336 | } | |
1da177e4 LT |
2337 | } |
2338 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2339 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2340 | block = device->block; |
2341 | device->block = NULL; | |
1da177e4 | 2342 | dasd_delete_device(device); |
8e09f215 SW |
2343 | /* |
2344 | * life cycle of block is bound to device, so delete it after | |
2345 | * device was safely removed | |
2346 | */ | |
2347 | if (block) | |
2348 | dasd_free_block(block); | |
1da177e4 LT |
2349 | return 0; |
2350 | } | |
2351 | ||
8e09f215 | 2352 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2353 | { |
2354 | struct dasd_device *device; | |
2355 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
2356 | int ret; |
2357 | ||
91c36919 | 2358 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2359 | if (IS_ERR(device)) |
2360 | return 0; | |
1da177e4 LT |
2361 | ret = 0; |
2362 | switch (event) { | |
2363 | case CIO_GONE: | |
47593bfa | 2364 | case CIO_BOXED: |
1da177e4 | 2365 | case CIO_NO_PATH: |
20c64468 SW |
2366 | /* First of all call extended error reporting. */ |
2367 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2368 | ||
1da177e4 LT |
2369 | if (device->state < DASD_STATE_BASIC) |
2370 | break; | |
2371 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2372 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2373 | if (cqr->status == DASD_CQR_IN_IO) { | |
2374 | cqr->status = DASD_CQR_QUEUED; | |
2375 | cqr->retries++; | |
2376 | } | |
2377 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2378 | dasd_device_clear_timer(device); | |
2379 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2380 | ret = 1; |
2381 | break; | |
2382 | case CIO_OPER: | |
2383 | /* FIXME: add a sanity check. */ | |
8e09f215 SW |
2384 | device->stopped &= ~DASD_STOPPED_DC_WAIT; |
2385 | dasd_schedule_device_bh(device); | |
2386 | if (device->block) | |
2387 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2388 | ret = 1; |
2389 | break; | |
2390 | } | |
1da177e4 LT |
2391 | dasd_put_device(device); |
2392 | return ret; | |
2393 | } | |
2394 | ||
763968e2 HC |
2395 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2396 | void *rdc_buffer, | |
2397 | int rdc_buffer_size, | |
2398 | char *magic) | |
17283b56 CH |
2399 | { |
2400 | struct dasd_ccw_req *cqr; | |
2401 | struct ccw1 *ccw; | |
2402 | ||
2403 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2404 | ||
2405 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
2406 | /* internal error 13 - Allocating the RDC request failed*/ |
2407 | dev_err(&device->cdev->dev, | |
2408 | "An error occurred in the DASD device driver, " | |
2409 | "reason=%s\n", "13"); | |
17283b56 CH |
2410 | return cqr; |
2411 | } | |
2412 | ||
2413 | ccw = cqr->cpaddr; | |
2414 | ccw->cmd_code = CCW_CMD_RDC; | |
2415 | ccw->cda = (__u32)(addr_t)rdc_buffer; | |
2416 | ccw->count = rdc_buffer_size; | |
2417 | ||
8e09f215 SW |
2418 | cqr->startdev = device; |
2419 | cqr->memdev = device; | |
17283b56 CH |
2420 | cqr->expires = 10*HZ; |
2421 | clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
2422 | cqr->retries = 2; | |
2423 | cqr->buildclk = get_clock(); | |
2424 | cqr->status = DASD_CQR_FILLED; | |
2425 | return cqr; | |
2426 | } | |
2427 | ||
2428 | ||
2429 | int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic, | |
92636b15 | 2430 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
2431 | { |
2432 | int ret; | |
2433 | struct dasd_ccw_req *cqr; | |
2434 | ||
92636b15 | 2435 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
2436 | magic); |
2437 | if (IS_ERR(cqr)) | |
2438 | return PTR_ERR(cqr); | |
2439 | ||
2440 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2441 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2442 | return ret; |
2443 | } | |
aaff0f64 | 2444 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2445 | |
f3eb5384 SW |
2446 | /* |
2447 | * In command mode and transport mode we need to look for sense | |
2448 | * data in different places. The sense data itself is allways | |
2449 | * an array of 32 bytes, so we can unify the sense data access | |
2450 | * for both modes. | |
2451 | */ | |
2452 | char *dasd_get_sense(struct irb *irb) | |
2453 | { | |
2454 | struct tsb *tsb = NULL; | |
2455 | char *sense = NULL; | |
2456 | ||
2457 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
2458 | if (irb->scsw.tm.tcw) | |
2459 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
2460 | irb->scsw.tm.tcw); | |
2461 | if (tsb && tsb->length == 64 && tsb->flags) | |
2462 | switch (tsb->flags & 0x07) { | |
2463 | case 1: /* tsa_iostat */ | |
2464 | sense = tsb->tsa.iostat.sense; | |
2465 | break; | |
2466 | case 2: /* tsa_ddpc */ | |
2467 | sense = tsb->tsa.ddpc.sense; | |
2468 | break; | |
2469 | default: | |
2470 | /* currently we don't use interrogate data */ | |
2471 | break; | |
2472 | } | |
2473 | } else if (irb->esw.esw0.erw.cons) { | |
2474 | sense = irb->ecw; | |
2475 | } | |
2476 | return sense; | |
2477 | } | |
2478 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
2479 | ||
8e09f215 | 2480 | static int __init dasd_init(void) |
1da177e4 LT |
2481 | { |
2482 | int rc; | |
2483 | ||
2484 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2485 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2486 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2487 | |
2488 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2489 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2490 | if (dasd_debug_area == NULL) { |
2491 | rc = -ENOMEM; | |
2492 | goto failed; | |
2493 | } | |
2494 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2495 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2496 | |
2497 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2498 | ||
2499 | dasd_diag_discipline_pointer = NULL; | |
2500 | ||
1da177e4 LT |
2501 | rc = dasd_devmap_init(); |
2502 | if (rc) | |
2503 | goto failed; | |
2504 | rc = dasd_gendisk_init(); | |
2505 | if (rc) | |
2506 | goto failed; | |
2507 | rc = dasd_parse(); | |
2508 | if (rc) | |
2509 | goto failed; | |
20c64468 SW |
2510 | rc = dasd_eer_init(); |
2511 | if (rc) | |
2512 | goto failed; | |
1da177e4 LT |
2513 | #ifdef CONFIG_PROC_FS |
2514 | rc = dasd_proc_init(); | |
2515 | if (rc) | |
2516 | goto failed; | |
2517 | #endif | |
2518 | ||
2519 | return 0; | |
2520 | failed: | |
fc19f381 | 2521 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
2522 | dasd_exit(); |
2523 | return rc; | |
2524 | } | |
2525 | ||
2526 | module_init(dasd_init); | |
2527 | module_exit(dasd_exit); | |
2528 | ||
2529 | EXPORT_SYMBOL(dasd_debug_area); | |
2530 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2531 | ||
2532 | EXPORT_SYMBOL(dasd_add_request_head); | |
2533 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2534 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2535 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2536 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2537 | EXPORT_SYMBOL(dasd_enable_device); |
2538 | EXPORT_SYMBOL(dasd_int_handler); | |
2539 | EXPORT_SYMBOL(dasd_kfree_request); | |
2540 | EXPORT_SYMBOL(dasd_kick_device); | |
2541 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2542 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2543 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2544 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2545 | EXPORT_SYMBOL(dasd_device_set_timer); |
2546 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2547 | EXPORT_SYMBOL(dasd_sfree_request); |
2548 | EXPORT_SYMBOL(dasd_sleep_on); | |
2549 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2550 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2551 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2552 | EXPORT_SYMBOL(dasd_start_IO); | |
2553 | EXPORT_SYMBOL(dasd_term_IO); | |
2554 | ||
2555 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2556 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2557 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2558 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2559 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2560 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2561 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2562 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2563 | EXPORT_SYMBOL_GPL(dasd_free_block); |