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> |
1da177e4 LT |
23 | |
24 | #include <asm/ccwdev.h> | |
25 | #include <asm/ebcdic.h> | |
26 | #include <asm/idals.h> | |
27 | #include <asm/todclk.h> | |
f3eb5384 | 28 | #include <asm/itcw.h> |
1da177e4 LT |
29 | |
30 | /* This is ugly... */ | |
31 | #define PRINTK_HEADER "dasd:" | |
32 | ||
33 | #include "dasd_int.h" | |
34 | /* | |
35 | * SECTION: Constant definitions to be used within this file | |
36 | */ | |
37 | #define DASD_CHANQ_MAX_SIZE 4 | |
38 | ||
39 | /* | |
40 | * SECTION: exported variables of dasd.c | |
41 | */ | |
42 | debug_info_t *dasd_debug_area; | |
43 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 44 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
45 | |
46 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
47 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
48 | " Copyright 2000 IBM Corporation"); | |
49 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
50 | MODULE_LICENSE("GPL"); |
51 | ||
52 | /* | |
53 | * SECTION: prototypes for static functions of dasd.c | |
54 | */ | |
8e09f215 SW |
55 | static int dasd_alloc_queue(struct dasd_block *); |
56 | static void dasd_setup_queue(struct dasd_block *); | |
57 | static void dasd_free_queue(struct dasd_block *); | |
58 | static void dasd_flush_request_queue(struct dasd_block *); | |
59 | static int dasd_flush_block_queue(struct dasd_block *); | |
60 | static void dasd_device_tasklet(struct dasd_device *); | |
61 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 62 | static void do_kick_device(struct work_struct *); |
8e09f215 | 63 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
64 | static void dasd_device_timeout(unsigned long); |
65 | static void dasd_block_timeout(unsigned long); | |
1da177e4 LT |
66 | |
67 | /* | |
68 | * SECTION: Operations on the device structure. | |
69 | */ | |
70 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 71 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 72 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
73 | |
74 | /* | |
75 | * Allocate memory for a new device structure. | |
76 | */ | |
8e09f215 | 77 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
78 | { |
79 | struct dasd_device *device; | |
80 | ||
8e09f215 SW |
81 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
82 | if (!device) | |
1da177e4 | 83 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
84 | |
85 | /* Get two pages for normal block device operations. */ | |
86 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 87 | if (!device->ccw_mem) { |
1da177e4 LT |
88 | kfree(device); |
89 | return ERR_PTR(-ENOMEM); | |
90 | } | |
91 | /* Get one page for error recovery. */ | |
92 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 93 | if (!device->erp_mem) { |
1da177e4 LT |
94 | free_pages((unsigned long) device->ccw_mem, 1); |
95 | kfree(device); | |
96 | return ERR_PTR(-ENOMEM); | |
97 | } | |
98 | ||
99 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
100 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
101 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 102 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 103 | tasklet_init(&device->tasklet, |
8e09f215 | 104 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
105 | (unsigned long) device); |
106 | INIT_LIST_HEAD(&device->ccw_queue); | |
107 | init_timer(&device->timer); | |
48cae885 SW |
108 | device->timer.function = dasd_device_timeout; |
109 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 110 | INIT_WORK(&device->kick_work, do_kick_device); |
1da177e4 LT |
111 | device->state = DASD_STATE_NEW; |
112 | device->target = DASD_STATE_NEW; | |
113 | ||
114 | return device; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Free memory of a device structure. | |
119 | */ | |
8e09f215 | 120 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 121 | { |
17fd682e | 122 | kfree(device->private); |
1da177e4 LT |
123 | free_page((unsigned long) device->erp_mem); |
124 | free_pages((unsigned long) device->ccw_mem, 1); | |
125 | kfree(device); | |
126 | } | |
127 | ||
8e09f215 SW |
128 | /* |
129 | * Allocate memory for a new device structure. | |
130 | */ | |
131 | struct dasd_block *dasd_alloc_block(void) | |
132 | { | |
133 | struct dasd_block *block; | |
134 | ||
135 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
136 | if (!block) | |
137 | return ERR_PTR(-ENOMEM); | |
138 | /* open_count = 0 means device online but not in use */ | |
139 | atomic_set(&block->open_count, -1); | |
140 | ||
141 | spin_lock_init(&block->request_queue_lock); | |
142 | atomic_set(&block->tasklet_scheduled, 0); | |
143 | tasklet_init(&block->tasklet, | |
144 | (void (*)(unsigned long)) dasd_block_tasklet, | |
145 | (unsigned long) block); | |
146 | INIT_LIST_HEAD(&block->ccw_queue); | |
147 | spin_lock_init(&block->queue_lock); | |
148 | init_timer(&block->timer); | |
48cae885 SW |
149 | block->timer.function = dasd_block_timeout; |
150 | block->timer.data = (unsigned long) block; | |
8e09f215 SW |
151 | |
152 | return block; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Free memory of a device structure. | |
157 | */ | |
158 | void dasd_free_block(struct dasd_block *block) | |
159 | { | |
160 | kfree(block); | |
161 | } | |
162 | ||
1da177e4 LT |
163 | /* |
164 | * Make a new device known to the system. | |
165 | */ | |
8e09f215 | 166 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
167 | { |
168 | int rc; | |
169 | ||
170 | /* | |
138c014d | 171 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
172 | * keep the reference count > 0. |
173 | */ | |
174 | dasd_get_device(device); | |
175 | ||
8e09f215 SW |
176 | if (device->block) { |
177 | rc = dasd_alloc_queue(device->block); | |
178 | if (rc) { | |
179 | dasd_put_device(device); | |
180 | return rc; | |
181 | } | |
1da177e4 | 182 | } |
1da177e4 LT |
183 | device->state = DASD_STATE_KNOWN; |
184 | return 0; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Let the system forget about a device. | |
189 | */ | |
8e09f215 | 190 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 191 | { |
20c64468 SW |
192 | /* Disable extended error reporting for this device. */ |
193 | dasd_eer_disable(device); | |
1da177e4 | 194 | /* Forget the discipline information. */ |
8e09f215 SW |
195 | if (device->discipline) { |
196 | if (device->discipline->uncheck_device) | |
197 | device->discipline->uncheck_device(device); | |
aa88861f | 198 | module_put(device->discipline->owner); |
8e09f215 | 199 | } |
1da177e4 | 200 | device->discipline = NULL; |
aa88861f PO |
201 | if (device->base_discipline) |
202 | module_put(device->base_discipline->owner); | |
203 | device->base_discipline = NULL; | |
1da177e4 LT |
204 | device->state = DASD_STATE_NEW; |
205 | ||
8e09f215 SW |
206 | if (device->block) |
207 | dasd_free_queue(device->block); | |
1da177e4 LT |
208 | |
209 | /* Give up reference we took in dasd_state_new_to_known. */ | |
210 | dasd_put_device(device); | |
8f61701b | 211 | return 0; |
1da177e4 LT |
212 | } |
213 | ||
214 | /* | |
215 | * Request the irq line for the device. | |
216 | */ | |
8e09f215 | 217 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
218 | { |
219 | int rc; | |
220 | ||
221 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
222 | if (device->block) { |
223 | rc = dasd_gendisk_alloc(device->block); | |
224 | if (rc) | |
225 | return rc; | |
226 | } | |
1da177e4 | 227 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 228 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 229 | 8 * sizeof(long)); |
1da177e4 | 230 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 231 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
232 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
233 | ||
234 | device->state = DASD_STATE_BASIC; | |
235 | return 0; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Release the irq line for the device. Terminate any running i/o. | |
240 | */ | |
8e09f215 | 241 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 242 | { |
8f61701b | 243 | int rc; |
8e09f215 SW |
244 | if (device->block) { |
245 | dasd_gendisk_free(device->block); | |
246 | dasd_block_clear_timer(device->block); | |
247 | } | |
248 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
249 | if (rc) |
250 | return rc; | |
8e09f215 | 251 | dasd_device_clear_timer(device); |
8f61701b | 252 | |
1da177e4 LT |
253 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
254 | if (device->debug_area != NULL) { | |
255 | debug_unregister(device->debug_area); | |
256 | device->debug_area = NULL; | |
257 | } | |
258 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 259 | return 0; |
1da177e4 LT |
260 | } |
261 | ||
262 | /* | |
263 | * Do the initial analysis. The do_analysis function may return | |
264 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
265 | * until the discipline decides to continue the startup sequence | |
266 | * by calling the function dasd_change_state. The eckd disciplines | |
267 | * uses this to start a ccw that detects the format. The completion | |
268 | * interrupt for this detection ccw uses the kernel event daemon to | |
269 | * trigger the call to dasd_change_state. All this is done in the | |
270 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
271 | * After the analysis ccw is done (do_analysis returned 0) the block |
272 | * device is setup. | |
273 | * In case the analysis returns an error, the device setup is stopped | |
274 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 275 | */ |
8e09f215 | 276 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
277 | { |
278 | int rc; | |
8e09f215 | 279 | struct dasd_block *block; |
1da177e4 LT |
280 | |
281 | rc = 0; | |
8e09f215 | 282 | block = device->block; |
90f0094d | 283 | /* make disk known with correct capacity */ |
8e09f215 SW |
284 | if (block) { |
285 | if (block->base->discipline->do_analysis != NULL) | |
286 | rc = block->base->discipline->do_analysis(block); | |
287 | if (rc) { | |
288 | if (rc != -EAGAIN) | |
289 | device->state = DASD_STATE_UNFMT; | |
290 | return rc; | |
291 | } | |
292 | dasd_setup_queue(block); | |
293 | set_capacity(block->gdp, | |
294 | block->blocks << block->s2b_shift); | |
295 | device->state = DASD_STATE_READY; | |
296 | rc = dasd_scan_partitions(block); | |
297 | if (rc) | |
298 | device->state = DASD_STATE_BASIC; | |
299 | } else { | |
300 | device->state = DASD_STATE_READY; | |
301 | } | |
90f0094d | 302 | return rc; |
1da177e4 LT |
303 | } |
304 | ||
305 | /* | |
306 | * Remove device from block device layer. Destroy dirty buffers. | |
307 | * Forget format information. Check if the target level is basic | |
308 | * and if it is create fake disk for formatting. | |
309 | */ | |
8e09f215 | 310 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 311 | { |
8f61701b HH |
312 | int rc; |
313 | ||
1da177e4 | 314 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
315 | if (device->block) { |
316 | struct dasd_block *block = device->block; | |
317 | rc = dasd_flush_block_queue(block); | |
318 | if (rc) { | |
319 | device->state = DASD_STATE_READY; | |
320 | return rc; | |
321 | } | |
322 | dasd_destroy_partitions(block); | |
323 | dasd_flush_request_queue(block); | |
324 | block->blocks = 0; | |
325 | block->bp_block = 0; | |
326 | block->s2b_shift = 0; | |
327 | } | |
8f61701b | 328 | return 0; |
1da177e4 LT |
329 | } |
330 | ||
90f0094d HH |
331 | /* |
332 | * Back to basic. | |
333 | */ | |
8e09f215 | 334 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
335 | { |
336 | device->state = DASD_STATE_BASIC; | |
8f61701b | 337 | return 0; |
90f0094d HH |
338 | } |
339 | ||
1da177e4 LT |
340 | /* |
341 | * Make the device online and schedule the bottom half to start | |
342 | * the requeueing of requests from the linux request queue to the | |
343 | * ccw queue. | |
344 | */ | |
8f61701b | 345 | static int |
1da177e4 LT |
346 | dasd_state_ready_to_online(struct dasd_device * device) |
347 | { | |
8e09f215 | 348 | int rc; |
1301809b SW |
349 | struct gendisk *disk; |
350 | struct disk_part_iter piter; | |
351 | struct hd_struct *part; | |
8e09f215 SW |
352 | |
353 | if (device->discipline->ready_to_online) { | |
354 | rc = device->discipline->ready_to_online(device); | |
355 | if (rc) | |
356 | return rc; | |
357 | } | |
1da177e4 | 358 | device->state = DASD_STATE_ONLINE; |
1301809b | 359 | if (device->block) { |
8e09f215 | 360 | dasd_schedule_block_bh(device->block); |
1301809b SW |
361 | disk = device->block->bdev->bd_disk; |
362 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
363 | while ((part = disk_part_iter_next(&piter))) | |
364 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
365 | disk_part_iter_exit(&piter); | |
366 | } | |
1da177e4 LT |
367 | return 0; |
368 | } | |
369 | ||
370 | /* | |
371 | * Stop the requeueing of requests again. | |
372 | */ | |
8e09f215 | 373 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 374 | { |
8e09f215 | 375 | int rc; |
1301809b SW |
376 | struct gendisk *disk; |
377 | struct disk_part_iter piter; | |
378 | struct hd_struct *part; | |
8e09f215 SW |
379 | |
380 | if (device->discipline->online_to_ready) { | |
381 | rc = device->discipline->online_to_ready(device); | |
382 | if (rc) | |
383 | return rc; | |
384 | } | |
1da177e4 | 385 | device->state = DASD_STATE_READY; |
1301809b SW |
386 | if (device->block) { |
387 | disk = device->block->bdev->bd_disk; | |
388 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
389 | while ((part = disk_part_iter_next(&piter))) | |
390 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
391 | disk_part_iter_exit(&piter); | |
392 | } | |
8f61701b | 393 | return 0; |
1da177e4 LT |
394 | } |
395 | ||
396 | /* | |
397 | * Device startup state changes. | |
398 | */ | |
8e09f215 | 399 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
400 | { |
401 | int rc; | |
402 | ||
403 | rc = 0; | |
404 | if (device->state == DASD_STATE_NEW && | |
405 | device->target >= DASD_STATE_KNOWN) | |
406 | rc = dasd_state_new_to_known(device); | |
407 | ||
408 | if (!rc && | |
409 | device->state == DASD_STATE_KNOWN && | |
410 | device->target >= DASD_STATE_BASIC) | |
411 | rc = dasd_state_known_to_basic(device); | |
412 | ||
413 | if (!rc && | |
414 | device->state == DASD_STATE_BASIC && | |
415 | device->target >= DASD_STATE_READY) | |
416 | rc = dasd_state_basic_to_ready(device); | |
417 | ||
39ccf95e HH |
418 | if (!rc && |
419 | device->state == DASD_STATE_UNFMT && | |
420 | device->target > DASD_STATE_UNFMT) | |
421 | rc = -EPERM; | |
422 | ||
1da177e4 LT |
423 | if (!rc && |
424 | device->state == DASD_STATE_READY && | |
425 | device->target >= DASD_STATE_ONLINE) | |
426 | rc = dasd_state_ready_to_online(device); | |
427 | ||
428 | return rc; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Device shutdown state changes. | |
433 | */ | |
8e09f215 | 434 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 435 | { |
8f61701b HH |
436 | int rc; |
437 | ||
438 | rc = 0; | |
1da177e4 LT |
439 | if (device->state == DASD_STATE_ONLINE && |
440 | device->target <= DASD_STATE_READY) | |
8f61701b | 441 | rc = dasd_state_online_to_ready(device); |
138c014d | 442 | |
8f61701b HH |
443 | if (!rc && |
444 | device->state == DASD_STATE_READY && | |
1da177e4 | 445 | device->target <= DASD_STATE_BASIC) |
8f61701b | 446 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 447 | |
8f61701b HH |
448 | if (!rc && |
449 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 450 | device->target <= DASD_STATE_BASIC) |
8f61701b | 451 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 452 | |
8f61701b HH |
453 | if (!rc && |
454 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 455 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 456 | rc = dasd_state_basic_to_known(device); |
138c014d | 457 | |
8f61701b HH |
458 | if (!rc && |
459 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 460 | device->target <= DASD_STATE_NEW) |
8f61701b | 461 | rc = dasd_state_known_to_new(device); |
1da177e4 | 462 | |
8f61701b | 463 | return rc; |
1da177e4 LT |
464 | } |
465 | ||
466 | /* | |
467 | * This is the main startup/shutdown routine. | |
468 | */ | |
8e09f215 | 469 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 LT |
470 | { |
471 | int rc; | |
472 | ||
473 | if (device->state == device->target) | |
474 | /* Already where we want to go today... */ | |
475 | return; | |
476 | if (device->state < device->target) | |
477 | rc = dasd_increase_state(device); | |
478 | else | |
479 | rc = dasd_decrease_state(device); | |
480 | if (rc && rc != -EAGAIN) | |
481 | device->target = device->state; | |
482 | ||
483 | if (device->state == device->target) | |
484 | wake_up(&dasd_init_waitq); | |
4dfd5c45 HH |
485 | |
486 | /* let user-space know that the device status changed */ | |
487 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
488 | } |
489 | ||
490 | /* | |
491 | * Kick starter for devices that did not complete the startup/shutdown | |
492 | * procedure or were sleeping because of a pending state. | |
493 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
494 | * event daemon. | |
495 | */ | |
8e09f215 | 496 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 497 | { |
4927b3f7 | 498 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
1da177e4 | 499 | dasd_change_state(device); |
8e09f215 | 500 | dasd_schedule_device_bh(device); |
1da177e4 LT |
501 | dasd_put_device(device); |
502 | } | |
503 | ||
8e09f215 | 504 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
505 | { |
506 | dasd_get_device(device); | |
507 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
508 | schedule_work(&device->kick_work); | |
509 | } | |
510 | ||
511 | /* | |
512 | * Set the target state for a device and starts the state change. | |
513 | */ | |
8e09f215 | 514 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 LT |
515 | { |
516 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
517 | if (dasd_probeonly && target > DASD_STATE_READY) | |
518 | target = DASD_STATE_READY; | |
519 | if (device->target != target) { | |
520 | if (device->state == target) | |
521 | wake_up(&dasd_init_waitq); | |
522 | device->target = target; | |
523 | } | |
524 | if (device->state != device->target) | |
525 | dasd_change_state(device); | |
526 | } | |
527 | ||
528 | /* | |
529 | * Enable devices with device numbers in [from..to]. | |
530 | */ | |
8e09f215 | 531 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
532 | { |
533 | return (device->state == device->target); | |
534 | } | |
535 | ||
8e09f215 | 536 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
537 | { |
538 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
539 | if (device->state <= DASD_STATE_KNOWN) | |
540 | /* No discipline for device found. */ | |
541 | dasd_set_target_state(device, DASD_STATE_NEW); | |
542 | /* Now wait for the devices to come up. */ | |
543 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
544 | } | |
545 | ||
546 | /* | |
547 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
548 | */ | |
549 | #ifdef CONFIG_DASD_PROFILE | |
550 | ||
551 | struct dasd_profile_info_t dasd_global_profile; | |
552 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
553 | ||
554 | /* | |
555 | * Increments counter in global and local profiling structures. | |
556 | */ | |
8e09f215 | 557 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
558 | { \ |
559 | int index; \ | |
560 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
561 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 562 | block->profile.counter[index]++; \ |
1da177e4 LT |
563 | } |
564 | ||
565 | /* | |
566 | * Add profiling information for cqr before execution. | |
567 | */ | |
8e09f215 SW |
568 | static void dasd_profile_start(struct dasd_block *block, |
569 | struct dasd_ccw_req *cqr, | |
570 | struct request *req) | |
1da177e4 LT |
571 | { |
572 | struct list_head *l; | |
573 | unsigned int counter; | |
574 | ||
575 | if (dasd_profile_level != DASD_PROFILE_ON) | |
576 | return; | |
577 | ||
578 | /* count the length of the chanq for statistics */ | |
579 | counter = 0; | |
8e09f215 | 580 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
581 | if (++counter >= 31) |
582 | break; | |
583 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 584 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
585 | } |
586 | ||
587 | /* | |
588 | * Add profiling information for cqr after execution. | |
589 | */ | |
8e09f215 SW |
590 | static void dasd_profile_end(struct dasd_block *block, |
591 | struct dasd_ccw_req *cqr, | |
592 | struct request *req) | |
1da177e4 LT |
593 | { |
594 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
595 | long tottimeps, sectors; | |
596 | ||
597 | if (dasd_profile_level != DASD_PROFILE_ON) | |
598 | return; | |
599 | ||
600 | sectors = req->nr_sectors; | |
601 | if (!cqr->buildclk || !cqr->startclk || | |
602 | !cqr->stopclk || !cqr->endclk || | |
603 | !sectors) | |
604 | return; | |
605 | ||
606 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
607 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
608 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
609 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
610 | tottimeps = tottime / sectors; | |
611 | ||
612 | if (!dasd_global_profile.dasd_io_reqs) | |
613 | memset(&dasd_global_profile, 0, | |
8e09f215 | 614 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
615 | dasd_global_profile.dasd_io_reqs++; |
616 | dasd_global_profile.dasd_io_sects += sectors; | |
617 | ||
8e09f215 SW |
618 | if (!block->profile.dasd_io_reqs) |
619 | memset(&block->profile, 0, | |
620 | sizeof(struct dasd_profile_info_t)); | |
621 | block->profile.dasd_io_reqs++; | |
622 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 623 | |
8e09f215 SW |
624 | dasd_profile_counter(sectors, dasd_io_secs, block); |
625 | dasd_profile_counter(tottime, dasd_io_times, block); | |
626 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
627 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
628 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
629 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
630 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
631 | } |
632 | #else | |
8e09f215 SW |
633 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
634 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
635 | #endif /* CONFIG_DASD_PROFILE */ |
636 | ||
637 | /* | |
638 | * Allocate memory for a channel program with 'cplength' channel | |
639 | * command words and 'datasize' additional space. There are two | |
640 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
641 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
642 | * that gets allocated for each device. | |
643 | */ | |
8e09f215 SW |
644 | struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength, |
645 | int datasize, | |
646 | struct dasd_device *device) | |
1da177e4 LT |
647 | { |
648 | struct dasd_ccw_req *cqr; | |
649 | ||
650 | /* Sanity checks */ | |
7ac1e877 ES |
651 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
652 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 653 | |
88abaab4 | 654 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
655 | if (cqr == NULL) |
656 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
657 | cqr->cpaddr = NULL; |
658 | if (cplength > 0) { | |
88abaab4 | 659 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
660 | GFP_ATOMIC | GFP_DMA); |
661 | if (cqr->cpaddr == NULL) { | |
662 | kfree(cqr); | |
663 | return ERR_PTR(-ENOMEM); | |
664 | } | |
1da177e4 LT |
665 | } |
666 | cqr->data = NULL; | |
667 | if (datasize > 0) { | |
88abaab4 | 668 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 669 | if (cqr->data == NULL) { |
17fd682e | 670 | kfree(cqr->cpaddr); |
1da177e4 LT |
671 | kfree(cqr); |
672 | return ERR_PTR(-ENOMEM); | |
673 | } | |
1da177e4 LT |
674 | } |
675 | strncpy((char *) &cqr->magic, magic, 4); | |
676 | ASCEBC((char *) &cqr->magic, 4); | |
677 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
678 | dasd_get_device(device); | |
679 | return cqr; | |
680 | } | |
681 | ||
8e09f215 SW |
682 | struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, |
683 | int datasize, | |
684 | struct dasd_device *device) | |
1da177e4 LT |
685 | { |
686 | unsigned long flags; | |
687 | struct dasd_ccw_req *cqr; | |
688 | char *data; | |
689 | int size; | |
690 | ||
691 | /* Sanity checks */ | |
7ac1e877 ES |
692 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
693 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
694 | |
695 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
696 | if (cplength > 0) | |
697 | size += cplength * sizeof(struct ccw1); | |
698 | if (datasize > 0) | |
699 | size += datasize; | |
700 | spin_lock_irqsave(&device->mem_lock, flags); | |
701 | cqr = (struct dasd_ccw_req *) | |
702 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
703 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
704 | if (cqr == NULL) | |
705 | return ERR_PTR(-ENOMEM); | |
706 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
707 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
708 | cqr->cpaddr = NULL; | |
709 | if (cplength > 0) { | |
710 | cqr->cpaddr = (struct ccw1 *) data; | |
711 | data += cplength*sizeof(struct ccw1); | |
712 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
713 | } | |
714 | cqr->data = NULL; | |
715 | if (datasize > 0) { | |
716 | cqr->data = data; | |
717 | memset(cqr->data, 0, datasize); | |
718 | } | |
719 | strncpy((char *) &cqr->magic, magic, 4); | |
720 | ASCEBC((char *) &cqr->magic, 4); | |
721 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
722 | dasd_get_device(device); | |
723 | return cqr; | |
724 | } | |
725 | ||
726 | /* | |
727 | * Free memory of a channel program. This function needs to free all the | |
728 | * idal lists that might have been created by dasd_set_cda and the | |
729 | * struct dasd_ccw_req itself. | |
730 | */ | |
8e09f215 | 731 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 732 | { |
347a8dc3 | 733 | #ifdef CONFIG_64BIT |
1da177e4 LT |
734 | struct ccw1 *ccw; |
735 | ||
736 | /* Clear any idals used for the request. */ | |
737 | ccw = cqr->cpaddr; | |
738 | do { | |
739 | clear_normalized_cda(ccw); | |
740 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
741 | #endif | |
17fd682e JJ |
742 | kfree(cqr->cpaddr); |
743 | kfree(cqr->data); | |
1da177e4 LT |
744 | kfree(cqr); |
745 | dasd_put_device(device); | |
746 | } | |
747 | ||
8e09f215 | 748 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
749 | { |
750 | unsigned long flags; | |
751 | ||
752 | spin_lock_irqsave(&device->mem_lock, flags); | |
753 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
754 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
755 | dasd_put_device(device); | |
756 | } | |
757 | ||
758 | /* | |
759 | * Check discipline magic in cqr. | |
760 | */ | |
8e09f215 | 761 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
762 | { |
763 | struct dasd_device *device; | |
764 | ||
765 | if (cqr == NULL) | |
766 | return -EINVAL; | |
8e09f215 | 767 | device = cqr->startdev; |
1da177e4 | 768 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 769 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
770 | " dasd_ccw_req 0x%08x magic doesn't match" |
771 | " discipline 0x%08x", | |
772 | cqr->magic, | |
773 | *(unsigned int *) device->discipline->name); | |
774 | return -EINVAL; | |
775 | } | |
776 | return 0; | |
777 | } | |
778 | ||
779 | /* | |
780 | * Terminate the current i/o and set the request to clear_pending. | |
781 | * Timer keeps device runnig. | |
782 | * ccw_device_clear can fail if the i/o subsystem | |
783 | * is in a bad mood. | |
784 | */ | |
8e09f215 | 785 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
786 | { |
787 | struct dasd_device *device; | |
788 | int retries, rc; | |
fc19f381 | 789 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
790 | |
791 | /* Check the cqr */ | |
792 | rc = dasd_check_cqr(cqr); | |
793 | if (rc) | |
794 | return rc; | |
795 | retries = 0; | |
8e09f215 | 796 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
797 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
798 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
799 | switch (rc) { | |
800 | case 0: /* termination successful */ | |
c2ba444d | 801 | cqr->retries--; |
8e09f215 | 802 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 803 | cqr->stopclk = get_clock(); |
8f61701b | 804 | cqr->starttime = 0; |
1da177e4 LT |
805 | DBF_DEV_EVENT(DBF_DEBUG, device, |
806 | "terminate cqr %p successful", | |
807 | cqr); | |
808 | break; | |
809 | case -ENODEV: | |
810 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
811 | "device gone, retry"); | |
812 | break; | |
813 | case -EIO: | |
814 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
815 | "I/O error, retry"); | |
816 | break; | |
817 | case -EINVAL: | |
818 | case -EBUSY: | |
819 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
820 | "device busy, retry later"); | |
821 | break; | |
822 | default: | |
fc19f381 SH |
823 | /* internal error 10 - unknown rc*/ |
824 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
825 | dev_err(&device->cdev->dev, "An error occurred in the " | |
826 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
827 | BUG(); |
828 | break; | |
829 | } | |
830 | retries++; | |
831 | } | |
8e09f215 | 832 | dasd_schedule_device_bh(device); |
1da177e4 LT |
833 | return rc; |
834 | } | |
835 | ||
836 | /* | |
837 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
838 | * In that case set up a timer to start the request later. | |
839 | */ | |
8e09f215 | 840 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
841 | { |
842 | struct dasd_device *device; | |
843 | int rc; | |
fc19f381 | 844 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
845 | |
846 | /* Check the cqr */ | |
847 | rc = dasd_check_cqr(cqr); | |
848 | if (rc) | |
849 | return rc; | |
8e09f215 | 850 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 851 | if (cqr->retries < 0) { |
fc19f381 SH |
852 | /* internal error 14 - start_IO run out of retries */ |
853 | sprintf(errorstring, "14 %p", cqr); | |
854 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
855 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 856 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
857 | return -EIO; |
858 | } | |
859 | cqr->startclk = get_clock(); | |
860 | cqr->starttime = jiffies; | |
861 | cqr->retries--; | |
f3eb5384 SW |
862 | if (cqr->cpmode == 1) { |
863 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
864 | (long) cqr, cqr->lpm); | |
865 | } else { | |
866 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
867 | (long) cqr, cqr->lpm, 0); | |
868 | } | |
1da177e4 LT |
869 | switch (rc) { |
870 | case 0: | |
871 | cqr->status = DASD_CQR_IN_IO; | |
872 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
873 | "start_IO: request %p started successful", | |
874 | cqr); | |
875 | break; | |
876 | case -EBUSY: | |
fc19f381 | 877 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
878 | "start_IO: device busy, retry later"); |
879 | break; | |
880 | case -ETIMEDOUT: | |
fc19f381 | 881 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
882 | "start_IO: request timeout, retry later"); |
883 | break; | |
884 | case -EACCES: | |
885 | /* -EACCES indicates that the request used only a | |
886 | * subset of the available pathes and all these | |
887 | * pathes are gone. | |
888 | * Do a retry with all available pathes. | |
889 | */ | |
890 | cqr->lpm = LPM_ANYPATH; | |
fc19f381 | 891 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
892 | "start_IO: selected pathes gone," |
893 | " retry on all pathes"); | |
894 | break; | |
895 | case -ENODEV: | |
f3eb5384 SW |
896 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
897 | "start_IO: -ENODEV device gone, retry"); | |
898 | break; | |
1da177e4 | 899 | case -EIO: |
fc19f381 | 900 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
f3eb5384 | 901 | "start_IO: -EIO device gone, retry"); |
1da177e4 LT |
902 | break; |
903 | default: | |
fc19f381 SH |
904 | /* internal error 11 - unknown rc */ |
905 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
906 | dev_err(&device->cdev->dev, | |
907 | "An error occurred in the DASD device driver, " | |
908 | "reason=%s\n", errorstring); | |
1da177e4 LT |
909 | BUG(); |
910 | break; | |
911 | } | |
912 | return rc; | |
913 | } | |
914 | ||
915 | /* | |
916 | * Timeout function for dasd devices. This is used for different purposes | |
917 | * 1) missing interrupt handler for normal operation | |
918 | * 2) delayed start of request where start_IO failed with -EBUSY | |
919 | * 3) timeout for missing state change interrupts | |
920 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
921 | * DASD_CQR_QUEUED for 2) and 3). | |
922 | */ | |
8e09f215 | 923 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
924 | { |
925 | unsigned long flags; | |
926 | struct dasd_device *device; | |
927 | ||
928 | device = (struct dasd_device *) ptr; | |
929 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
930 | /* re-activate request queue */ | |
931 | device->stopped &= ~DASD_STOPPED_PENDING; | |
932 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
8e09f215 | 933 | dasd_schedule_device_bh(device); |
1da177e4 LT |
934 | } |
935 | ||
936 | /* | |
937 | * Setup timeout for a device in jiffies. | |
938 | */ | |
8e09f215 | 939 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 940 | { |
48cae885 SW |
941 | if (expires == 0) |
942 | del_timer(&device->timer); | |
943 | else | |
944 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 LT |
945 | } |
946 | ||
947 | /* | |
948 | * Clear timeout for a device. | |
949 | */ | |
8e09f215 | 950 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 951 | { |
48cae885 | 952 | del_timer(&device->timer); |
1da177e4 LT |
953 | } |
954 | ||
8e09f215 SW |
955 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
956 | unsigned long intparm) | |
1da177e4 LT |
957 | { |
958 | struct dasd_ccw_req *cqr; | |
959 | struct dasd_device *device; | |
960 | ||
f16f5843 SW |
961 | if (!intparm) |
962 | return; | |
1da177e4 LT |
963 | cqr = (struct dasd_ccw_req *) intparm; |
964 | if (cqr->status != DASD_CQR_IN_IO) { | |
fc19f381 | 965 | DBF_EVENT(DBF_DEBUG, |
1da177e4 LT |
966 | "invalid status in handle_killed_request: " |
967 | "bus_id %s, status %02x", | |
2a0217d5 | 968 | dev_name(&cdev->dev), cqr->status); |
1da177e4 LT |
969 | return; |
970 | } | |
971 | ||
8e09f215 | 972 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 973 | if (device == NULL || |
a00bfd71 | 974 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 | 975 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 SH |
976 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid device in request: " |
977 | "bus_id %s", dev_name(&cdev->dev)); | |
1da177e4 LT |
978 | return; |
979 | } | |
980 | ||
981 | /* Schedule request to be retried. */ | |
982 | cqr->status = DASD_CQR_QUEUED; | |
983 | ||
8e09f215 SW |
984 | dasd_device_clear_timer(device); |
985 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
986 | dasd_put_device(device); |
987 | } | |
988 | ||
8e09f215 | 989 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 990 | { |
20c64468 SW |
991 | /* First of all start sense subsystem status request. */ |
992 | dasd_eer_snss(device); | |
993 | ||
1da177e4 | 994 | device->stopped &= ~DASD_STOPPED_PENDING; |
8e09f215 SW |
995 | dasd_schedule_device_bh(device); |
996 | if (device->block) | |
997 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
998 | } |
999 | ||
1000 | /* | |
1001 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1002 | */ | |
8e09f215 SW |
1003 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1004 | struct irb *irb) | |
1da177e4 LT |
1005 | { |
1006 | struct dasd_ccw_req *cqr, *next; | |
1007 | struct dasd_device *device; | |
1008 | unsigned long long now; | |
1009 | int expires; | |
1da177e4 LT |
1010 | |
1011 | if (IS_ERR(irb)) { | |
1012 | switch (PTR_ERR(irb)) { | |
1013 | case -EIO: | |
1da177e4 LT |
1014 | break; |
1015 | case -ETIMEDOUT: | |
fc19f381 | 1016 | DBF_EVENT(DBF_WARNING, "%s(%s): request timed out\n", |
2a0217d5 | 1017 | __func__, dev_name(&cdev->dev)); |
1da177e4 LT |
1018 | break; |
1019 | default: | |
fc19f381 | 1020 | DBF_EVENT(DBF_WARNING, "%s(%s): unknown error %ld\n", |
2a0217d5 | 1021 | __func__, dev_name(&cdev->dev), PTR_ERR(irb)); |
1da177e4 | 1022 | } |
f16f5843 | 1023 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1024 | return; |
1025 | } | |
1026 | ||
1027 | now = get_clock(); | |
1028 | ||
8e09f215 SW |
1029 | /* check for unsolicited interrupts */ |
1030 | cqr = (struct dasd_ccw_req *) intparm; | |
f3eb5384 SW |
1031 | if (!cqr || ((scsw_cc(&irb->scsw) == 1) && |
1032 | (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) && | |
1033 | (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) { | |
8e09f215 SW |
1034 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
1035 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1036 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1037 | if (!IS_ERR(device)) { |
8e09f215 SW |
1038 | dasd_device_clear_timer(device); |
1039 | device->discipline->handle_unsolicited_interrupt(device, | |
1040 | irb); | |
1da177e4 LT |
1041 | dasd_put_device(device); |
1042 | } | |
1043 | return; | |
1044 | } | |
1045 | ||
8e09f215 SW |
1046 | device = (struct dasd_device *) cqr->startdev; |
1047 | if (!device || | |
1da177e4 | 1048 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 SH |
1049 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid device in request: " |
1050 | "bus_id %s", dev_name(&cdev->dev)); | |
1da177e4 LT |
1051 | return; |
1052 | } | |
1053 | ||
1054 | /* Check for clear pending */ | |
8e09f215 | 1055 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1056 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1057 | cqr->status = DASD_CQR_CLEARED; |
1058 | dasd_device_clear_timer(device); | |
8f61701b | 1059 | wake_up(&dasd_flush_wq); |
8e09f215 | 1060 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1061 | return; |
1062 | } | |
1063 | ||
f3eb5384 | 1064 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1065 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1066 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1067 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1068 | return; |
1069 | } | |
fc19f381 | 1070 | |
8e09f215 | 1071 | next = NULL; |
1da177e4 | 1072 | expires = 0; |
f3eb5384 SW |
1073 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1074 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1075 | /* request was completed successfully */ |
1076 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1077 | cqr->stopclk = now; |
1078 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1079 | if (cqr->devlist.next != &device->ccw_queue) { |
1080 | next = list_entry(cqr->devlist.next, | |
1081 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1082 | } |
8e09f215 SW |
1083 | } else { /* error */ |
1084 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
fc19f381 SH |
1085 | /* log sense for every failed I/O to s390 debugfeature */ |
1086 | dasd_log_sense_dbf(cqr, irb); | |
9575bf26 | 1087 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1088 | dasd_log_sense(cqr, irb); |
1089 | } | |
fc19f381 | 1090 | |
6c5f57c7 SH |
1091 | /* |
1092 | * If we don't want complex ERP for this request, then just | |
1093 | * reset this and retry it in the fastpath | |
8e09f215 | 1094 | */ |
6c5f57c7 | 1095 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1096 | cqr->retries > 0) { |
fc19f381 SH |
1097 | if (cqr->lpm == LPM_ANYPATH) |
1098 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
1099 | "default ERP in fastpath " | |
1100 | "(%i retries left)", | |
1101 | cqr->retries); | |
8e09f215 SW |
1102 | cqr->lpm = LPM_ANYPATH; |
1103 | cqr->status = DASD_CQR_QUEUED; | |
1104 | next = cqr; | |
1105 | } else | |
1da177e4 | 1106 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1107 | } |
1108 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1109 | (!device->stopped)) { | |
1110 | if (device->discipline->start_IO(next) == 0) | |
1111 | expires = next->expires; | |
1da177e4 LT |
1112 | } |
1113 | if (expires != 0) | |
8e09f215 | 1114 | dasd_device_set_timer(device, expires); |
1da177e4 | 1115 | else |
8e09f215 SW |
1116 | dasd_device_clear_timer(device); |
1117 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | /* | |
8e09f215 SW |
1121 | * If we have an error on a dasd_block layer request then we cancel |
1122 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1123 | */ |
8e09f215 SW |
1124 | static void __dasd_device_recovery(struct dasd_device *device, |
1125 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1126 | { |
8e09f215 SW |
1127 | struct list_head *l, *n; |
1128 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1129 | |
8e09f215 SW |
1130 | /* |
1131 | * only requeue request that came from the dasd_block layer | |
1132 | */ | |
1133 | if (!ref_cqr->block) | |
1134 | return; | |
1da177e4 | 1135 | |
8e09f215 SW |
1136 | list_for_each_safe(l, n, &device->ccw_queue) { |
1137 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1138 | if (cqr->status == DASD_CQR_QUEUED && | |
1139 | ref_cqr->block == cqr->block) { | |
1140 | cqr->status = DASD_CQR_CLEARED; | |
1141 | } | |
1142 | } | |
1143 | }; | |
1da177e4 LT |
1144 | |
1145 | /* | |
8e09f215 SW |
1146 | * Remove those ccw requests from the queue that need to be returned |
1147 | * to the upper layer. | |
1da177e4 | 1148 | */ |
8e09f215 SW |
1149 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1150 | struct list_head *final_queue) | |
1da177e4 LT |
1151 | { |
1152 | struct list_head *l, *n; | |
1153 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1154 | |
1da177e4 LT |
1155 | /* Process request with final status. */ |
1156 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1157 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1158 | ||
1da177e4 | 1159 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1160 | if (cqr->status == DASD_CQR_QUEUED || |
1161 | cqr->status == DASD_CQR_IN_IO || | |
1162 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1163 | break; |
1da177e4 | 1164 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1165 | __dasd_device_recovery(device, cqr); |
20c64468 | 1166 | } |
1da177e4 | 1167 | /* Rechain finished requests to final queue */ |
8e09f215 | 1168 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1169 | } |
1170 | } | |
1171 | ||
1da177e4 | 1172 | /* |
8e09f215 SW |
1173 | * the cqrs from the final queue are returned to the upper layer |
1174 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1175 | */ |
8e09f215 SW |
1176 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1177 | struct list_head *final_queue) | |
1da177e4 | 1178 | { |
8e09f215 | 1179 | struct list_head *l, *n; |
1da177e4 | 1180 | struct dasd_ccw_req *cqr; |
03513bcc | 1181 | struct dasd_block *block; |
c80ee724 SH |
1182 | void (*callback)(struct dasd_ccw_req *, void *data); |
1183 | void *callback_data; | |
fc19f381 | 1184 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1185 | |
8e09f215 SW |
1186 | list_for_each_safe(l, n, final_queue) { |
1187 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1188 | list_del_init(&cqr->devlist); | |
03513bcc | 1189 | block = cqr->block; |
c80ee724 SH |
1190 | callback = cqr->callback; |
1191 | callback_data = cqr->callback_data; | |
03513bcc SW |
1192 | if (block) |
1193 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1194 | switch (cqr->status) { |
1195 | case DASD_CQR_SUCCESS: | |
1196 | cqr->status = DASD_CQR_DONE; | |
1197 | break; | |
1198 | case DASD_CQR_ERROR: | |
1199 | cqr->status = DASD_CQR_NEED_ERP; | |
1200 | break; | |
1201 | case DASD_CQR_CLEARED: | |
1202 | cqr->status = DASD_CQR_TERMINATED; | |
1203 | break; | |
1204 | default: | |
fc19f381 SH |
1205 | /* internal error 12 - wrong cqr status*/ |
1206 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1207 | dev_err(&device->cdev->dev, | |
1208 | "An error occurred in the DASD device driver, " | |
1209 | "reason=%s\n", errorstring); | |
8e09f215 | 1210 | BUG(); |
1da177e4 | 1211 | } |
8e09f215 | 1212 | if (cqr->callback != NULL) |
c80ee724 | 1213 | (callback)(cqr, callback_data); |
03513bcc SW |
1214 | if (block) |
1215 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1216 | } |
1217 | } | |
1218 | ||
1219 | /* | |
1220 | * Take a look at the first request on the ccw queue and check | |
1221 | * if it reached its expire time. If so, terminate the IO. | |
1222 | */ | |
8e09f215 | 1223 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1224 | { |
1225 | struct dasd_ccw_req *cqr; | |
1226 | ||
1227 | if (list_empty(&device->ccw_queue)) | |
1228 | return; | |
8e09f215 | 1229 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1230 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1231 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1232 | if (device->discipline->term_IO(cqr) != 0) { | |
1233 | /* Hmpf, try again in 5 sec */ | |
fc19f381 SH |
1234 | dev_err(&device->cdev->dev, |
1235 | "cqr %p timed out (%is) but cannot be " | |
1236 | "ended, retrying in 5 s\n", | |
1237 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1238 | cqr->expires += 5*HZ; |
1239 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1240 | } else { |
fc19f381 SH |
1241 | dev_err(&device->cdev->dev, |
1242 | "cqr %p timed out (%is), %i retries " | |
1243 | "remaining\n", cqr, (cqr->expires/HZ), | |
1244 | cqr->retries); | |
1da177e4 LT |
1245 | } |
1246 | } | |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * Take a look at the first request on the ccw queue and check | |
1251 | * if it needs to be started. | |
1252 | */ | |
8e09f215 | 1253 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1254 | { |
1255 | struct dasd_ccw_req *cqr; | |
1256 | int rc; | |
1257 | ||
1258 | if (list_empty(&device->ccw_queue)) | |
1259 | return; | |
8e09f215 | 1260 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1261 | if (cqr->status != DASD_CQR_QUEUED) |
1262 | return; | |
8e09f215 SW |
1263 | /* when device is stopped, return request to previous layer */ |
1264 | if (device->stopped) { | |
1265 | cqr->status = DASD_CQR_CLEARED; | |
1266 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1267 | return; |
1c01b8a5 | 1268 | } |
25ee4cf8 PO |
1269 | |
1270 | rc = device->discipline->start_IO(cqr); | |
1271 | if (rc == 0) | |
8e09f215 | 1272 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1273 | else if (rc == -EACCES) { |
8e09f215 | 1274 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1275 | } else |
1276 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1277 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1278 | } |
1279 | ||
1da177e4 | 1280 | /* |
8e09f215 SW |
1281 | * Go through all request on the dasd_device request queue, |
1282 | * terminate them on the cdev if necessary, and return them to the | |
1283 | * submitting layer via callback. | |
1284 | * Note: | |
1285 | * Make sure that all 'submitting layers' still exist when | |
1286 | * this function is called!. In other words, when 'device' is a base | |
1287 | * device then all block layer requests must have been removed before | |
1288 | * via dasd_flush_block_queue. | |
1da177e4 | 1289 | */ |
8e09f215 | 1290 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1291 | { |
8e09f215 SW |
1292 | struct dasd_ccw_req *cqr, *n; |
1293 | int rc; | |
1da177e4 | 1294 | struct list_head flush_queue; |
1da177e4 LT |
1295 | |
1296 | INIT_LIST_HEAD(&flush_queue); | |
1297 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1298 | rc = 0; |
8e09f215 | 1299 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1300 | /* Check status and move request to flush_queue */ |
1301 | switch (cqr->status) { | |
1302 | case DASD_CQR_IN_IO: | |
1303 | rc = device->discipline->term_IO(cqr); | |
1304 | if (rc) { | |
1305 | /* unable to terminate requeust */ | |
fc19f381 SH |
1306 | dev_err(&device->cdev->dev, |
1307 | "Flushing the DASD request queue " | |
1308 | "failed for request %p\n", cqr); | |
8f61701b HH |
1309 | /* stop flush processing */ |
1310 | goto finished; | |
1311 | } | |
1312 | break; | |
1313 | case DASD_CQR_QUEUED: | |
1da177e4 | 1314 | cqr->stopclk = get_clock(); |
8e09f215 | 1315 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1316 | break; |
8e09f215 | 1317 | default: /* no need to modify the others */ |
8f61701b HH |
1318 | break; |
1319 | } | |
8e09f215 | 1320 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1321 | } |
8f61701b HH |
1322 | finished: |
1323 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1324 | /* |
1325 | * After this point all requests must be in state CLEAR_PENDING, | |
1326 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1327 | * one of the others. | |
1328 | */ | |
1329 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1330 | wait_event(dasd_flush_wq, | |
1331 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1332 | /* | |
1333 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1334 | * and call the callback function of flushed requests | |
1335 | */ | |
1336 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1337 | return rc; |
1da177e4 LT |
1338 | } |
1339 | ||
1340 | /* | |
1341 | * Acquire the device lock and process queues for the device. | |
1342 | */ | |
8e09f215 | 1343 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1344 | { |
1345 | struct list_head final_queue; | |
1da177e4 LT |
1346 | |
1347 | atomic_set (&device->tasklet_scheduled, 0); | |
1348 | INIT_LIST_HEAD(&final_queue); | |
1349 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1350 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1351 | __dasd_device_check_expire(device); |
1352 | /* find final requests on ccw queue */ | |
1353 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1354 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1355 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1356 | __dasd_device_process_final_queue(device, &final_queue); |
1357 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1358 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1359 | __dasd_device_start_head(device); |
1360 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1361 | dasd_put_device(device); |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1366 | */ | |
8e09f215 | 1367 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1368 | { |
1369 | /* Protect against rescheduling. */ | |
973bd993 | 1370 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1371 | return; |
1372 | dasd_get_device(device); | |
1373 | tasklet_hi_schedule(&device->tasklet); | |
1374 | } | |
1375 | ||
1376 | /* | |
8e09f215 SW |
1377 | * Queue a request to the head of the device ccw_queue. |
1378 | * Start the I/O if possible. | |
1da177e4 | 1379 | */ |
8e09f215 | 1380 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1381 | { |
1382 | struct dasd_device *device; | |
1383 | unsigned long flags; | |
1384 | ||
8e09f215 | 1385 | device = cqr->startdev; |
1da177e4 | 1386 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1387 | cqr->status = DASD_CQR_QUEUED; |
1388 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1389 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1390 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1391 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1392 | } | |
1393 | ||
1394 | /* | |
8e09f215 SW |
1395 | * Queue a request to the tail of the device ccw_queue. |
1396 | * Start the I/O if possible. | |
1da177e4 | 1397 | */ |
8e09f215 | 1398 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1399 | { |
1400 | struct dasd_device *device; | |
1401 | unsigned long flags; | |
1402 | ||
8e09f215 | 1403 | device = cqr->startdev; |
1da177e4 | 1404 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1405 | cqr->status = DASD_CQR_QUEUED; |
1406 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1407 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1408 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1409 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1410 | } | |
1411 | ||
1412 | /* | |
8e09f215 | 1413 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1414 | */ |
8e09f215 | 1415 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 LT |
1416 | { |
1417 | wake_up((wait_queue_head_t *) data); | |
1418 | } | |
1419 | ||
8e09f215 | 1420 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1421 | { |
1422 | struct dasd_device *device; | |
1423 | int rc; | |
1424 | ||
8e09f215 | 1425 | device = cqr->startdev; |
1da177e4 | 1426 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
c2ba444d | 1427 | rc = ((cqr->status == DASD_CQR_DONE || |
8e09f215 SW |
1428 | cqr->status == DASD_CQR_NEED_ERP || |
1429 | cqr->status == DASD_CQR_TERMINATED) && | |
1430 | list_empty(&cqr->devlist)); | |
1da177e4 LT |
1431 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1432 | return rc; | |
1433 | } | |
1434 | ||
1435 | /* | |
8e09f215 SW |
1436 | * Queue a request to the tail of the device ccw_queue and wait for |
1437 | * it's completion. | |
1da177e4 | 1438 | */ |
8e09f215 | 1439 | int dasd_sleep_on(struct dasd_ccw_req *cqr) |
1da177e4 | 1440 | { |
1da177e4 LT |
1441 | struct dasd_device *device; |
1442 | int rc; | |
138c014d | 1443 | |
8e09f215 | 1444 | device = cqr->startdev; |
138c014d | 1445 | |
1da177e4 | 1446 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1447 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1448 | dasd_add_request_tail(cqr); |
c80ee724 | 1449 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1450 | |
1da177e4 | 1451 | /* Request status is either done or failed. */ |
8e09f215 | 1452 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1453 | return rc; |
1454 | } | |
1455 | ||
1456 | /* | |
8e09f215 SW |
1457 | * Queue a request to the tail of the device ccw_queue and wait |
1458 | * interruptible for it's completion. | |
1da177e4 | 1459 | */ |
8e09f215 | 1460 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1461 | { |
1da177e4 | 1462 | struct dasd_device *device; |
8e09f215 | 1463 | int rc; |
1da177e4 | 1464 | |
8e09f215 | 1465 | device = cqr->startdev; |
1da177e4 | 1466 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1467 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1468 | dasd_add_request_tail(cqr); |
c80ee724 | 1469 | rc = wait_event_interruptible(generic_waitq, _wait_for_wakeup(cqr)); |
8e09f215 SW |
1470 | if (rc == -ERESTARTSYS) { |
1471 | dasd_cancel_req(cqr); | |
1472 | /* wait (non-interruptible) for final status */ | |
c80ee724 | 1473 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
1da177e4 | 1474 | } |
8e09f215 | 1475 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1476 | return rc; |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1481 | * for eckd devices) the currently running request has to be terminated | |
1482 | * and be put back to status queued, before the special request is added | |
1483 | * to the head of the queue. Then the special request is waited on normally. | |
1484 | */ | |
8e09f215 | 1485 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1486 | { |
1487 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1488 | |
1489 | if (list_empty(&device->ccw_queue)) | |
1490 | return 0; | |
8e09f215 | 1491 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1492 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1493 | } |
1494 | ||
8e09f215 | 1495 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1496 | { |
1da177e4 LT |
1497 | struct dasd_device *device; |
1498 | int rc; | |
138c014d | 1499 | |
8e09f215 | 1500 | device = cqr->startdev; |
1da177e4 LT |
1501 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1502 | rc = _dasd_term_running_cqr(device); | |
1503 | if (rc) { | |
1504 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1505 | return rc; | |
1506 | } | |
138c014d | 1507 | |
1da177e4 | 1508 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1509 | cqr->callback_data = (void *) &generic_waitq; |
1da177e4 | 1510 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1511 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1512 | |
1da177e4 | 1513 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1514 | dasd_schedule_device_bh(device); |
138c014d | 1515 | |
1da177e4 LT |
1516 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1517 | ||
c80ee724 | 1518 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1519 | |
1da177e4 | 1520 | /* Request status is either done or failed. */ |
8e09f215 | 1521 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1522 | return rc; |
1523 | } | |
1524 | ||
1525 | /* | |
1526 | * Cancels a request that was started with dasd_sleep_on_req. | |
1527 | * This is useful to timeout requests. The request will be | |
1528 | * terminated if it is currently in i/o. | |
1529 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1530 | * 0 if there was no need to terminate the request (not started yet) |
1531 | * negative error code if termination failed | |
1532 | * Cancellation of a request is an asynchronous operation! The calling | |
1533 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1534 | */ |
8e09f215 | 1535 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1536 | { |
8e09f215 | 1537 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1538 | unsigned long flags; |
1539 | int rc; | |
1540 | ||
1541 | rc = 0; | |
1542 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1543 | switch (cqr->status) { | |
1544 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1545 | /* request was not started - just set to cleared */ |
1546 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1547 | break; |
1548 | case DASD_CQR_IN_IO: | |
1549 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1550 | rc = device->discipline->term_IO(cqr); |
1551 | if (rc) { | |
fc19f381 SH |
1552 | dev_err(&device->cdev->dev, |
1553 | "Cancelling request %p failed with rc=%d\n", | |
1554 | cqr, rc); | |
8e09f215 SW |
1555 | } else { |
1556 | cqr->stopclk = get_clock(); | |
1557 | rc = 1; | |
1558 | } | |
1da177e4 | 1559 | break; |
8e09f215 | 1560 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1561 | break; |
8e09f215 SW |
1562 | } |
1563 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1564 | dasd_schedule_device_bh(device); | |
1565 | return rc; | |
1566 | } | |
1567 | ||
1568 | ||
1569 | /* | |
1570 | * SECTION: Operations of the dasd_block layer. | |
1571 | */ | |
1572 | ||
1573 | /* | |
1574 | * Timeout function for dasd_block. This is used when the block layer | |
1575 | * is waiting for something that may not come reliably, (e.g. a state | |
1576 | * change interrupt) | |
1577 | */ | |
1578 | static void dasd_block_timeout(unsigned long ptr) | |
1579 | { | |
1580 | unsigned long flags; | |
1581 | struct dasd_block *block; | |
1582 | ||
1583 | block = (struct dasd_block *) ptr; | |
1584 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1585 | /* re-activate request queue */ | |
1586 | block->base->stopped &= ~DASD_STOPPED_PENDING; | |
1587 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); | |
1588 | dasd_schedule_block_bh(block); | |
1589 | } | |
1590 | ||
1591 | /* | |
1592 | * Setup timeout for a dasd_block in jiffies. | |
1593 | */ | |
1594 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1595 | { | |
48cae885 SW |
1596 | if (expires == 0) |
1597 | del_timer(&block->timer); | |
1598 | else | |
1599 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 SW |
1600 | } |
1601 | ||
1602 | /* | |
1603 | * Clear timeout for a dasd_block. | |
1604 | */ | |
1605 | void dasd_block_clear_timer(struct dasd_block *block) | |
1606 | { | |
48cae885 | 1607 | del_timer(&block->timer); |
8e09f215 SW |
1608 | } |
1609 | ||
1610 | /* | |
1611 | * posts the buffer_cache about a finalized request | |
1612 | */ | |
4c4e2148 | 1613 | static inline void dasd_end_request(struct request *req, int error) |
8e09f215 | 1614 | { |
4c4e2148 | 1615 | if (__blk_end_request(req, error, blk_rq_bytes(req))) |
1da177e4 | 1616 | BUG(); |
8e09f215 SW |
1617 | } |
1618 | ||
1619 | /* | |
1620 | * Process finished error recovery ccw. | |
1621 | */ | |
1622 | static inline void __dasd_block_process_erp(struct dasd_block *block, | |
1623 | struct dasd_ccw_req *cqr) | |
1624 | { | |
1625 | dasd_erp_fn_t erp_fn; | |
1626 | struct dasd_device *device = block->base; | |
1627 | ||
1628 | if (cqr->status == DASD_CQR_DONE) | |
1629 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1630 | else | |
fc19f381 | 1631 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
1632 | erp_fn = device->discipline->erp_postaction(cqr); |
1633 | erp_fn(cqr); | |
1634 | } | |
1da177e4 | 1635 | |
8e09f215 SW |
1636 | /* |
1637 | * Fetch requests from the block device queue. | |
1638 | */ | |
1639 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1640 | { | |
1641 | struct request_queue *queue; | |
1642 | struct request *req; | |
1643 | struct dasd_ccw_req *cqr; | |
1644 | struct dasd_device *basedev; | |
1645 | unsigned long flags; | |
1646 | queue = block->request_queue; | |
1647 | basedev = block->base; | |
1648 | /* No queue ? Then there is nothing to do. */ | |
1649 | if (queue == NULL) | |
1650 | return; | |
1651 | ||
1652 | /* | |
1653 | * We requeue request from the block device queue to the ccw | |
1654 | * queue only in two states. In state DASD_STATE_READY the | |
1655 | * partition detection is done and we need to requeue requests | |
1656 | * for that. State DASD_STATE_ONLINE is normal block device | |
1657 | * operation. | |
1658 | */ | |
1659 | if (basedev->state < DASD_STATE_READY) | |
1660 | return; | |
1661 | /* Now we try to fetch requests from the request queue */ | |
1662 | while (!blk_queue_plugged(queue) && | |
1663 | elv_next_request(queue)) { | |
1664 | ||
1665 | req = elv_next_request(queue); | |
1666 | ||
1667 | if (basedev->features & DASD_FEATURE_READONLY && | |
1668 | rq_data_dir(req) == WRITE) { | |
1669 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1670 | "Rejecting write request %p", | |
1671 | req); | |
1672 | blkdev_dequeue_request(req); | |
4c4e2148 | 1673 | dasd_end_request(req, -EIO); |
8e09f215 SW |
1674 | continue; |
1675 | } | |
1676 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1677 | if (IS_ERR(cqr)) { | |
1678 | if (PTR_ERR(cqr) == -EBUSY) | |
1679 | break; /* normal end condition */ | |
1680 | if (PTR_ERR(cqr) == -ENOMEM) | |
1681 | break; /* terminate request queue loop */ | |
1682 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1683 | /* | |
1684 | * The current request cannot be build right | |
1685 | * now, we have to try later. If this request | |
1686 | * is the head-of-queue we stop the device | |
1687 | * for 1/2 second. | |
1688 | */ | |
1689 | if (!list_empty(&block->ccw_queue)) | |
1690 | break; | |
1691 | spin_lock_irqsave(get_ccwdev_lock(basedev->cdev), flags); | |
1692 | basedev->stopped |= DASD_STOPPED_PENDING; | |
1693 | spin_unlock_irqrestore(get_ccwdev_lock(basedev->cdev), flags); | |
1694 | dasd_block_set_timer(block, HZ/2); | |
1695 | break; | |
1696 | } | |
1697 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1698 | "CCW creation failed (rc=%ld) " | |
1699 | "on request %p", | |
1700 | PTR_ERR(cqr), req); | |
1701 | blkdev_dequeue_request(req); | |
4c4e2148 | 1702 | dasd_end_request(req, -EIO); |
8e09f215 SW |
1703 | continue; |
1704 | } | |
1705 | /* | |
1706 | * Note: callback is set to dasd_return_cqr_cb in | |
1707 | * __dasd_block_start_head to cover erp requests as well | |
1708 | */ | |
1709 | cqr->callback_data = (void *) req; | |
1710 | cqr->status = DASD_CQR_FILLED; | |
1711 | blkdev_dequeue_request(req); | |
1712 | list_add_tail(&cqr->blocklist, &block->ccw_queue); | |
1713 | dasd_profile_start(block, cqr, req); | |
1714 | } | |
1715 | } | |
1716 | ||
1717 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1718 | { | |
1719 | struct request *req; | |
1720 | int status; | |
4c4e2148 | 1721 | int error = 0; |
8e09f215 SW |
1722 | |
1723 | req = (struct request *) cqr->callback_data; | |
1724 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1725 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1726 | if (status <= 0) |
1727 | error = status ? status : -EIO; | |
1728 | dasd_end_request(req, error); | |
8e09f215 SW |
1729 | } |
1730 | ||
1731 | /* | |
1732 | * Process ccw request queue. | |
1733 | */ | |
1734 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1735 | struct list_head *final_queue) | |
1736 | { | |
1737 | struct list_head *l, *n; | |
1738 | struct dasd_ccw_req *cqr; | |
1739 | dasd_erp_fn_t erp_fn; | |
1740 | unsigned long flags; | |
1741 | struct dasd_device *base = block->base; | |
1742 | ||
1743 | restart: | |
1744 | /* Process request with final status. */ | |
1745 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1746 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1747 | if (cqr->status != DASD_CQR_DONE && | |
1748 | cqr->status != DASD_CQR_FAILED && | |
1749 | cqr->status != DASD_CQR_NEED_ERP && | |
1750 | cqr->status != DASD_CQR_TERMINATED) | |
1751 | continue; | |
1752 | ||
1753 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1754 | base->discipline->handle_terminated_request(cqr); | |
1755 | goto restart; | |
1756 | } | |
1757 | ||
1758 | /* Process requests that may be recovered */ | |
1759 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 SH |
1760 | erp_fn = base->discipline->erp_action(cqr); |
1761 | erp_fn(cqr); | |
8e09f215 SW |
1762 | goto restart; |
1763 | } | |
1764 | ||
a9cffb22 SH |
1765 | /* log sense for fatal error */ |
1766 | if (cqr->status == DASD_CQR_FAILED) { | |
1767 | dasd_log_sense(cqr, &cqr->irb); | |
1768 | } | |
1769 | ||
8e09f215 SW |
1770 | /* First of all call extended error reporting. */ |
1771 | if (dasd_eer_enabled(base) && | |
1772 | cqr->status == DASD_CQR_FAILED) { | |
1773 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1774 | ||
1775 | /* restart request */ | |
1776 | cqr->status = DASD_CQR_FILLED; | |
1777 | cqr->retries = 255; | |
1778 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
1779 | base->stopped |= DASD_STOPPED_QUIESCE; | |
1780 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), | |
1781 | flags); | |
1782 | goto restart; | |
1783 | } | |
1784 | ||
1785 | /* Process finished ERP request. */ | |
1786 | if (cqr->refers) { | |
1787 | __dasd_block_process_erp(block, cqr); | |
1788 | goto restart; | |
1789 | } | |
1790 | ||
1791 | /* Rechain finished requests to final queue */ | |
1792 | cqr->endclk = get_clock(); | |
1793 | list_move_tail(&cqr->blocklist, final_queue); | |
1794 | } | |
1795 | } | |
1796 | ||
1797 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1798 | { | |
1799 | dasd_schedule_block_bh(cqr->block); | |
1800 | } | |
1801 | ||
1802 | static void __dasd_block_start_head(struct dasd_block *block) | |
1803 | { | |
1804 | struct dasd_ccw_req *cqr; | |
1805 | ||
1806 | if (list_empty(&block->ccw_queue)) | |
1807 | return; | |
1808 | /* We allways begin with the first requests on the queue, as some | |
1809 | * of previously started requests have to be enqueued on a | |
1810 | * dasd_device again for error recovery. | |
1811 | */ | |
1812 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1813 | if (cqr->status != DASD_CQR_FILLED) | |
1814 | continue; | |
1815 | /* Non-temporary stop condition will trigger fail fast */ | |
1816 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1817 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1818 | (!dasd_eer_enabled(block->base))) { | |
1819 | cqr->status = DASD_CQR_FAILED; | |
1820 | dasd_schedule_block_bh(block); | |
1821 | continue; | |
1822 | } | |
1823 | /* Don't try to start requests if device is stopped */ | |
1824 | if (block->base->stopped) | |
1825 | return; | |
1826 | ||
1827 | /* just a fail safe check, should not happen */ | |
1828 | if (!cqr->startdev) | |
1829 | cqr->startdev = block->base; | |
1830 | ||
1831 | /* make sure that the requests we submit find their way back */ | |
1832 | cqr->callback = dasd_return_cqr_cb; | |
1833 | ||
1834 | dasd_add_request_tail(cqr); | |
1835 | } | |
1836 | } | |
1837 | ||
1838 | /* | |
1839 | * Central dasd_block layer routine. Takes requests from the generic | |
1840 | * block layer request queue, creates ccw requests, enqueues them on | |
1841 | * a dasd_device and processes ccw requests that have been returned. | |
1842 | */ | |
1843 | static void dasd_block_tasklet(struct dasd_block *block) | |
1844 | { | |
1845 | struct list_head final_queue; | |
1846 | struct list_head *l, *n; | |
1847 | struct dasd_ccw_req *cqr; | |
1848 | ||
1849 | atomic_set(&block->tasklet_scheduled, 0); | |
1850 | INIT_LIST_HEAD(&final_queue); | |
1851 | spin_lock(&block->queue_lock); | |
1852 | /* Finish off requests on ccw queue */ | |
1853 | __dasd_process_block_ccw_queue(block, &final_queue); | |
1854 | spin_unlock(&block->queue_lock); | |
1855 | /* Now call the callback function of requests with final status */ | |
1856 | spin_lock_irq(&block->request_queue_lock); | |
1857 | list_for_each_safe(l, n, &final_queue) { | |
1858 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1859 | list_del_init(&cqr->blocklist); | |
1860 | __dasd_cleanup_cqr(cqr); | |
1861 | } | |
1862 | spin_lock(&block->queue_lock); | |
1863 | /* Get new request from the block device request queue */ | |
1864 | __dasd_process_request_queue(block); | |
1865 | /* Now check if the head of the ccw queue needs to be started. */ | |
1866 | __dasd_block_start_head(block); | |
1867 | spin_unlock(&block->queue_lock); | |
1868 | spin_unlock_irq(&block->request_queue_lock); | |
1869 | dasd_put_device(block->base); | |
1870 | } | |
1871 | ||
1872 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
1873 | { | |
1874 | wake_up(&dasd_flush_wq); | |
1875 | } | |
1876 | ||
1877 | /* | |
1878 | * Go through all request on the dasd_block request queue, cancel them | |
1879 | * on the respective dasd_device, and return them to the generic | |
1880 | * block layer. | |
1881 | */ | |
1882 | static int dasd_flush_block_queue(struct dasd_block *block) | |
1883 | { | |
1884 | struct dasd_ccw_req *cqr, *n; | |
1885 | int rc, i; | |
1886 | struct list_head flush_queue; | |
1887 | ||
1888 | INIT_LIST_HEAD(&flush_queue); | |
1889 | spin_lock_bh(&block->queue_lock); | |
1890 | rc = 0; | |
1891 | restart: | |
1892 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
1893 | /* if this request currently owned by a dasd_device cancel it */ | |
1894 | if (cqr->status >= DASD_CQR_QUEUED) | |
1895 | rc = dasd_cancel_req(cqr); | |
1896 | if (rc < 0) | |
1897 | break; | |
1898 | /* Rechain request (including erp chain) so it won't be | |
1899 | * touched by the dasd_block_tasklet anymore. | |
1900 | * Replace the callback so we notice when the request | |
1901 | * is returned from the dasd_device layer. | |
1902 | */ | |
1903 | cqr->callback = _dasd_wake_block_flush_cb; | |
1904 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
1905 | list_move_tail(&cqr->blocklist, &flush_queue); | |
1906 | if (i > 1) | |
1907 | /* moved more than one request - need to restart */ | |
1908 | goto restart; | |
1909 | } | |
1910 | spin_unlock_bh(&block->queue_lock); | |
1911 | /* Now call the callback function of flushed requests */ | |
1912 | restart_cb: | |
1913 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
1914 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
1915 | /* Process finished ERP request. */ | |
1916 | if (cqr->refers) { | |
0cd4bd47 | 1917 | spin_lock_bh(&block->queue_lock); |
8e09f215 | 1918 | __dasd_block_process_erp(block, cqr); |
0cd4bd47 | 1919 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
1920 | /* restart list_for_xx loop since dasd_process_erp |
1921 | * might remove multiple elements */ | |
1922 | goto restart_cb; | |
1923 | } | |
1924 | /* call the callback function */ | |
0cd4bd47 | 1925 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
1926 | cqr->endclk = get_clock(); |
1927 | list_del_init(&cqr->blocklist); | |
1928 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 1929 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 1930 | } |
1da177e4 LT |
1931 | return rc; |
1932 | } | |
1933 | ||
1934 | /* | |
8e09f215 SW |
1935 | * Schedules a call to dasd_tasklet over the device tasklet. |
1936 | */ | |
1937 | void dasd_schedule_block_bh(struct dasd_block *block) | |
1938 | { | |
1939 | /* Protect against rescheduling. */ | |
1940 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
1941 | return; | |
1942 | /* life cycle of block is bound to it's base device */ | |
1943 | dasd_get_device(block->base); | |
1944 | tasklet_hi_schedule(&block->tasklet); | |
1945 | } | |
1946 | ||
1947 | ||
1948 | /* | |
1949 | * SECTION: external block device operations | |
1950 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
1951 | */ |
1952 | ||
1953 | /* | |
1954 | * Dasd request queue function. Called from ll_rw_blk.c | |
1955 | */ | |
8e09f215 | 1956 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 1957 | { |
8e09f215 | 1958 | struct dasd_block *block; |
1da177e4 | 1959 | |
8e09f215 SW |
1960 | block = queue->queuedata; |
1961 | spin_lock(&block->queue_lock); | |
1da177e4 | 1962 | /* Get new request from the block device request queue */ |
8e09f215 | 1963 | __dasd_process_request_queue(block); |
1da177e4 | 1964 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1965 | __dasd_block_start_head(block); |
1966 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
1967 | } |
1968 | ||
1969 | /* | |
1970 | * Allocate and initialize request queue and default I/O scheduler. | |
1971 | */ | |
8e09f215 | 1972 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
1973 | { |
1974 | int rc; | |
1975 | ||
8e09f215 SW |
1976 | block->request_queue = blk_init_queue(do_dasd_request, |
1977 | &block->request_queue_lock); | |
1978 | if (block->request_queue == NULL) | |
1da177e4 LT |
1979 | return -ENOMEM; |
1980 | ||
8e09f215 | 1981 | block->request_queue->queuedata = block; |
1da177e4 | 1982 | |
8e09f215 | 1983 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 1984 | block->request_queue->elevator = NULL; |
8e09f215 | 1985 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 1986 | if (rc) { |
8e09f215 | 1987 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
1988 | return rc; |
1989 | } | |
1990 | return 0; | |
1991 | } | |
1992 | ||
1993 | /* | |
1994 | * Allocate and initialize request queue. | |
1995 | */ | |
8e09f215 | 1996 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
1997 | { |
1998 | int max; | |
1999 | ||
8e09f215 SW |
2000 | blk_queue_hardsect_size(block->request_queue, block->bp_block); |
2001 | max = block->base->discipline->max_blocks << block->s2b_shift; | |
2002 | blk_queue_max_sectors(block->request_queue, max); | |
2003 | blk_queue_max_phys_segments(block->request_queue, -1L); | |
2004 | blk_queue_max_hw_segments(block->request_queue, -1L); | |
f3eb5384 SW |
2005 | /* with page sized segments we can translate each segement into |
2006 | * one idaw/tidaw | |
2007 | */ | |
2008 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
2009 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
8e09f215 | 2010 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); |
1da177e4 LT |
2011 | } |
2012 | ||
2013 | /* | |
2014 | * Deactivate and free request queue. | |
2015 | */ | |
8e09f215 | 2016 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2017 | { |
8e09f215 SW |
2018 | if (block->request_queue) { |
2019 | blk_cleanup_queue(block->request_queue); | |
2020 | block->request_queue = NULL; | |
1da177e4 LT |
2021 | } |
2022 | } | |
2023 | ||
2024 | /* | |
2025 | * Flush request on the request queue. | |
2026 | */ | |
8e09f215 | 2027 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2028 | { |
2029 | struct request *req; | |
2030 | ||
8e09f215 | 2031 | if (!block->request_queue) |
1da177e4 | 2032 | return; |
138c014d | 2033 | |
8e09f215 SW |
2034 | spin_lock_irq(&block->request_queue_lock); |
2035 | while ((req = elv_next_request(block->request_queue))) { | |
1da177e4 | 2036 | blkdev_dequeue_request(req); |
4c4e2148 | 2037 | dasd_end_request(req, -EIO); |
1da177e4 | 2038 | } |
8e09f215 | 2039 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2040 | } |
2041 | ||
57a7c0bc | 2042 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2043 | { |
57a7c0bc | 2044 | struct dasd_block *block = bdev->bd_disk->private_data; |
8e09f215 | 2045 | struct dasd_device *base = block->base; |
1da177e4 LT |
2046 | int rc; |
2047 | ||
8e09f215 SW |
2048 | atomic_inc(&block->open_count); |
2049 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2050 | rc = -ENODEV; |
2051 | goto unlock; | |
2052 | } | |
2053 | ||
8e09f215 | 2054 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2055 | rc = -EINVAL; |
2056 | goto unlock; | |
2057 | } | |
2058 | ||
2059 | if (dasd_probeonly) { | |
fc19f381 SH |
2060 | dev_info(&base->cdev->dev, |
2061 | "Accessing the DASD failed because it is in " | |
2062 | "probeonly mode\n"); | |
1da177e4 LT |
2063 | rc = -EPERM; |
2064 | goto out; | |
2065 | } | |
2066 | ||
8e09f215 SW |
2067 | if (base->state <= DASD_STATE_BASIC) { |
2068 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2069 | " Cannot open unrecognized device"); |
2070 | rc = -ENODEV; | |
2071 | goto out; | |
2072 | } | |
2073 | ||
2074 | return 0; | |
2075 | ||
2076 | out: | |
8e09f215 | 2077 | module_put(base->discipline->owner); |
1da177e4 | 2078 | unlock: |
8e09f215 | 2079 | atomic_dec(&block->open_count); |
1da177e4 LT |
2080 | return rc; |
2081 | } | |
2082 | ||
57a7c0bc | 2083 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2084 | { |
8e09f215 | 2085 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2086 | |
8e09f215 SW |
2087 | atomic_dec(&block->open_count); |
2088 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2089 | return 0; |
2090 | } | |
2091 | ||
a885c8c4 CH |
2092 | /* |
2093 | * Return disk geometry. | |
2094 | */ | |
8e09f215 | 2095 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2096 | { |
8e09f215 SW |
2097 | struct dasd_block *block; |
2098 | struct dasd_device *base; | |
a885c8c4 | 2099 | |
8e09f215 SW |
2100 | block = bdev->bd_disk->private_data; |
2101 | base = block->base; | |
2102 | if (!block) | |
a885c8c4 CH |
2103 | return -ENODEV; |
2104 | ||
8e09f215 SW |
2105 | if (!base->discipline || |
2106 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2107 | return -EINVAL; |
2108 | ||
8e09f215 SW |
2109 | base->discipline->fill_geometry(block, geo); |
2110 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2111 | return 0; |
2112 | } | |
2113 | ||
1da177e4 LT |
2114 | struct block_device_operations |
2115 | dasd_device_operations = { | |
2116 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2117 | .open = dasd_open, |
2118 | .release = dasd_release, | |
0000d031 HC |
2119 | .ioctl = dasd_ioctl, |
2120 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 2121 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2122 | }; |
2123 | ||
8e09f215 SW |
2124 | /******************************************************************************* |
2125 | * end of block device operations | |
2126 | */ | |
1da177e4 LT |
2127 | |
2128 | static void | |
2129 | dasd_exit(void) | |
2130 | { | |
2131 | #ifdef CONFIG_PROC_FS | |
2132 | dasd_proc_exit(); | |
2133 | #endif | |
20c64468 | 2134 | dasd_eer_exit(); |
6bb0e010 HH |
2135 | if (dasd_page_cache != NULL) { |
2136 | kmem_cache_destroy(dasd_page_cache); | |
2137 | dasd_page_cache = NULL; | |
2138 | } | |
1da177e4 LT |
2139 | dasd_gendisk_exit(); |
2140 | dasd_devmap_exit(); | |
1da177e4 LT |
2141 | if (dasd_debug_area != NULL) { |
2142 | debug_unregister(dasd_debug_area); | |
2143 | dasd_debug_area = NULL; | |
2144 | } | |
2145 | } | |
2146 | ||
2147 | /* | |
2148 | * SECTION: common functions for ccw_driver use | |
2149 | */ | |
2150 | ||
1c01b8a5 HH |
2151 | /* |
2152 | * Initial attempt at a probe function. this can be simplified once | |
2153 | * the other detection code is gone. | |
2154 | */ | |
8e09f215 SW |
2155 | int dasd_generic_probe(struct ccw_device *cdev, |
2156 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2157 | { |
2158 | int ret; | |
2159 | ||
40545573 HH |
2160 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
2161 | if (ret) { | |
fc19f381 | 2162 | DBF_EVENT(DBF_WARNING, |
40545573 | 2163 | "dasd_generic_probe: could not set ccw-device options " |
2a0217d5 | 2164 | "for %s\n", dev_name(&cdev->dev)); |
40545573 HH |
2165 | return ret; |
2166 | } | |
1da177e4 LT |
2167 | ret = dasd_add_sysfs_files(cdev); |
2168 | if (ret) { | |
fc19f381 | 2169 | DBF_EVENT(DBF_WARNING, |
1da177e4 | 2170 | "dasd_generic_probe: could not add sysfs entries " |
2a0217d5 | 2171 | "for %s\n", dev_name(&cdev->dev)); |
40545573 | 2172 | return ret; |
1da177e4 | 2173 | } |
40545573 | 2174 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2175 | |
40545573 HH |
2176 | /* |
2177 | * Automatically online either all dasd devices (dasd_autodetect) | |
2178 | * or all devices specified with dasd= parameters during | |
2179 | * initial probe. | |
2180 | */ | |
2181 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2182 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
40545573 HH |
2183 | ret = ccw_device_set_online(cdev); |
2184 | if (ret) | |
fc19f381 | 2185 | pr_warning("%s: Setting the DASD online failed with rc=%d\n", |
2a0217d5 | 2186 | dev_name(&cdev->dev), ret); |
de3e0da1 | 2187 | return 0; |
1da177e4 LT |
2188 | } |
2189 | ||
1c01b8a5 HH |
2190 | /* |
2191 | * This will one day be called from a global not_oper handler. | |
2192 | * It is also used by driver_unregister during module unload. | |
2193 | */ | |
8e09f215 | 2194 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2195 | { |
2196 | struct dasd_device *device; | |
8e09f215 | 2197 | struct dasd_block *block; |
1da177e4 | 2198 | |
59afda78 HH |
2199 | cdev->handler = NULL; |
2200 | ||
1da177e4 LT |
2201 | dasd_remove_sysfs_files(cdev); |
2202 | device = dasd_device_from_cdev(cdev); | |
2203 | if (IS_ERR(device)) | |
2204 | return; | |
2205 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2206 | /* Already doing offline processing */ | |
2207 | dasd_put_device(device); | |
2208 | return; | |
2209 | } | |
2210 | /* | |
2211 | * This device is removed unconditionally. Set offline | |
2212 | * flag to prevent dasd_open from opening it while it is | |
2213 | * no quite down yet. | |
2214 | */ | |
2215 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2216 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2217 | block = device->block; |
2218 | device->block = NULL; | |
1da177e4 | 2219 | dasd_delete_device(device); |
8e09f215 SW |
2220 | /* |
2221 | * life cycle of block is bound to device, so delete it after | |
2222 | * device was safely removed | |
2223 | */ | |
2224 | if (block) | |
2225 | dasd_free_block(block); | |
1da177e4 LT |
2226 | } |
2227 | ||
1c01b8a5 HH |
2228 | /* |
2229 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2230 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2231 | * or the user has started activation through sysfs. |
2232 | */ | |
8e09f215 SW |
2233 | int dasd_generic_set_online(struct ccw_device *cdev, |
2234 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2235 | { |
aa88861f | 2236 | struct dasd_discipline *discipline; |
1da177e4 | 2237 | struct dasd_device *device; |
c6eb7b77 | 2238 | int rc; |
f24acd45 | 2239 | |
40545573 HH |
2240 | /* first online clears initial online feature flag */ |
2241 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2242 | device = dasd_create_device(cdev); |
2243 | if (IS_ERR(device)) | |
2244 | return PTR_ERR(device); | |
2245 | ||
aa88861f | 2246 | discipline = base_discipline; |
c6eb7b77 | 2247 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 2248 | if (!dasd_diag_discipline_pointer) { |
fc19f381 SH |
2249 | pr_warning("%s Setting the DASD online failed because " |
2250 | "of missing DIAG discipline\n", | |
2251 | dev_name(&cdev->dev)); | |
1da177e4 LT |
2252 | dasd_delete_device(device); |
2253 | return -ENODEV; | |
2254 | } | |
2255 | discipline = dasd_diag_discipline_pointer; | |
2256 | } | |
aa88861f PO |
2257 | if (!try_module_get(base_discipline->owner)) { |
2258 | dasd_delete_device(device); | |
2259 | return -EINVAL; | |
2260 | } | |
2261 | if (!try_module_get(discipline->owner)) { | |
2262 | module_put(base_discipline->owner); | |
2263 | dasd_delete_device(device); | |
2264 | return -EINVAL; | |
2265 | } | |
2266 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2267 | device->discipline = discipline; |
2268 | ||
8e09f215 | 2269 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2270 | rc = discipline->check_device(device); |
2271 | if (rc) { | |
fc19f381 SH |
2272 | pr_warning("%s Setting the DASD online with discipline %s " |
2273 | "failed with rc=%i\n", | |
2274 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
2275 | module_put(discipline->owner); |
2276 | module_put(base_discipline->owner); | |
1da177e4 LT |
2277 | dasd_delete_device(device); |
2278 | return rc; | |
2279 | } | |
2280 | ||
2281 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2282 | if (device->state <= DASD_STATE_KNOWN) { | |
fc19f381 SH |
2283 | pr_warning("%s Setting the DASD online failed because of a " |
2284 | "missing discipline\n", dev_name(&cdev->dev)); | |
1da177e4 LT |
2285 | rc = -ENODEV; |
2286 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2287 | if (device->block) |
2288 | dasd_free_block(device->block); | |
1da177e4 LT |
2289 | dasd_delete_device(device); |
2290 | } else | |
2291 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2292 | dev_name(&cdev->dev)); |
1da177e4 LT |
2293 | |
2294 | /* FIXME: we have to wait for the root device but we don't want | |
2295 | * to wait for each single device but for all at once. */ | |
2296 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2297 | ||
2298 | dasd_put_device(device); | |
2299 | ||
2300 | return rc; | |
2301 | } | |
2302 | ||
8e09f215 | 2303 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2304 | { |
2305 | struct dasd_device *device; | |
8e09f215 | 2306 | struct dasd_block *block; |
dafd87aa | 2307 | int max_count, open_count; |
1da177e4 LT |
2308 | |
2309 | device = dasd_device_from_cdev(cdev); | |
2310 | if (IS_ERR(device)) | |
2311 | return PTR_ERR(device); | |
2312 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2313 | /* Already doing offline processing */ | |
2314 | dasd_put_device(device); | |
2315 | return 0; | |
2316 | } | |
2317 | /* | |
2318 | * We must make sure that this device is currently not in use. | |
2319 | * The open_count is increased for every opener, that includes | |
2320 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2321 | * in the other openers. | |
2322 | */ | |
8e09f215 | 2323 | if (device->block) { |
a806170e HC |
2324 | max_count = device->block->bdev ? 0 : -1; |
2325 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2326 | if (open_count > max_count) { |
2327 | if (open_count > 0) | |
fc19f381 SH |
2328 | pr_warning("%s: The DASD cannot be set offline " |
2329 | "with open count %i\n", | |
2330 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 2331 | else |
fc19f381 SH |
2332 | pr_warning("%s: The DASD cannot be set offline " |
2333 | "while it is in use\n", | |
2334 | dev_name(&cdev->dev)); | |
8e09f215 SW |
2335 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2336 | dasd_put_device(device); | |
2337 | return -EBUSY; | |
2338 | } | |
1da177e4 LT |
2339 | } |
2340 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2341 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2342 | block = device->block; |
2343 | device->block = NULL; | |
1da177e4 | 2344 | dasd_delete_device(device); |
8e09f215 SW |
2345 | /* |
2346 | * life cycle of block is bound to device, so delete it after | |
2347 | * device was safely removed | |
2348 | */ | |
2349 | if (block) | |
2350 | dasd_free_block(block); | |
1da177e4 LT |
2351 | return 0; |
2352 | } | |
2353 | ||
8e09f215 | 2354 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2355 | { |
2356 | struct dasd_device *device; | |
2357 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
2358 | int ret; |
2359 | ||
91c36919 | 2360 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2361 | if (IS_ERR(device)) |
2362 | return 0; | |
1da177e4 LT |
2363 | ret = 0; |
2364 | switch (event) { | |
2365 | case CIO_GONE: | |
47593bfa | 2366 | case CIO_BOXED: |
1da177e4 | 2367 | case CIO_NO_PATH: |
20c64468 SW |
2368 | /* First of all call extended error reporting. */ |
2369 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2370 | ||
1da177e4 LT |
2371 | if (device->state < DASD_STATE_BASIC) |
2372 | break; | |
2373 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2374 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2375 | if (cqr->status == DASD_CQR_IN_IO) { | |
2376 | cqr->status = DASD_CQR_QUEUED; | |
2377 | cqr->retries++; | |
2378 | } | |
2379 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2380 | dasd_device_clear_timer(device); | |
2381 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2382 | ret = 1; |
2383 | break; | |
2384 | case CIO_OPER: | |
2385 | /* FIXME: add a sanity check. */ | |
8e09f215 SW |
2386 | device->stopped &= ~DASD_STOPPED_DC_WAIT; |
2387 | dasd_schedule_device_bh(device); | |
2388 | if (device->block) | |
2389 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2390 | ret = 1; |
2391 | break; | |
2392 | } | |
1da177e4 LT |
2393 | dasd_put_device(device); |
2394 | return ret; | |
2395 | } | |
2396 | ||
763968e2 HC |
2397 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2398 | void *rdc_buffer, | |
2399 | int rdc_buffer_size, | |
2400 | char *magic) | |
17283b56 CH |
2401 | { |
2402 | struct dasd_ccw_req *cqr; | |
2403 | struct ccw1 *ccw; | |
2404 | ||
2405 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2406 | ||
2407 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
2408 | /* internal error 13 - Allocating the RDC request failed*/ |
2409 | dev_err(&device->cdev->dev, | |
2410 | "An error occurred in the DASD device driver, " | |
2411 | "reason=%s\n", "13"); | |
17283b56 CH |
2412 | return cqr; |
2413 | } | |
2414 | ||
2415 | ccw = cqr->cpaddr; | |
2416 | ccw->cmd_code = CCW_CMD_RDC; | |
2417 | ccw->cda = (__u32)(addr_t)rdc_buffer; | |
2418 | ccw->count = rdc_buffer_size; | |
2419 | ||
8e09f215 SW |
2420 | cqr->startdev = device; |
2421 | cqr->memdev = device; | |
17283b56 CH |
2422 | cqr->expires = 10*HZ; |
2423 | clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
2424 | cqr->retries = 2; | |
2425 | cqr->buildclk = get_clock(); | |
2426 | cqr->status = DASD_CQR_FILLED; | |
2427 | return cqr; | |
2428 | } | |
2429 | ||
2430 | ||
2431 | int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic, | |
2432 | void **rdc_buffer, int rdc_buffer_size) | |
2433 | { | |
2434 | int ret; | |
2435 | struct dasd_ccw_req *cqr; | |
2436 | ||
2437 | cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size, | |
2438 | magic); | |
2439 | if (IS_ERR(cqr)) | |
2440 | return PTR_ERR(cqr); | |
2441 | ||
2442 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2443 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2444 | return ret; |
2445 | } | |
aaff0f64 | 2446 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2447 | |
f3eb5384 SW |
2448 | /* |
2449 | * In command mode and transport mode we need to look for sense | |
2450 | * data in different places. The sense data itself is allways | |
2451 | * an array of 32 bytes, so we can unify the sense data access | |
2452 | * for both modes. | |
2453 | */ | |
2454 | char *dasd_get_sense(struct irb *irb) | |
2455 | { | |
2456 | struct tsb *tsb = NULL; | |
2457 | char *sense = NULL; | |
2458 | ||
2459 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
2460 | if (irb->scsw.tm.tcw) | |
2461 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
2462 | irb->scsw.tm.tcw); | |
2463 | if (tsb && tsb->length == 64 && tsb->flags) | |
2464 | switch (tsb->flags & 0x07) { | |
2465 | case 1: /* tsa_iostat */ | |
2466 | sense = tsb->tsa.iostat.sense; | |
2467 | break; | |
2468 | case 2: /* tsa_ddpc */ | |
2469 | sense = tsb->tsa.ddpc.sense; | |
2470 | break; | |
2471 | default: | |
2472 | /* currently we don't use interrogate data */ | |
2473 | break; | |
2474 | } | |
2475 | } else if (irb->esw.esw0.erw.cons) { | |
2476 | sense = irb->ecw; | |
2477 | } | |
2478 | return sense; | |
2479 | } | |
2480 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
2481 | ||
8e09f215 | 2482 | static int __init dasd_init(void) |
1da177e4 LT |
2483 | { |
2484 | int rc; | |
2485 | ||
2486 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2487 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2488 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2489 | |
2490 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2491 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2492 | if (dasd_debug_area == NULL) { |
2493 | rc = -ENOMEM; | |
2494 | goto failed; | |
2495 | } | |
2496 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2497 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2498 | |
2499 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2500 | ||
2501 | dasd_diag_discipline_pointer = NULL; | |
2502 | ||
1da177e4 LT |
2503 | rc = dasd_devmap_init(); |
2504 | if (rc) | |
2505 | goto failed; | |
2506 | rc = dasd_gendisk_init(); | |
2507 | if (rc) | |
2508 | goto failed; | |
2509 | rc = dasd_parse(); | |
2510 | if (rc) | |
2511 | goto failed; | |
20c64468 SW |
2512 | rc = dasd_eer_init(); |
2513 | if (rc) | |
2514 | goto failed; | |
1da177e4 LT |
2515 | #ifdef CONFIG_PROC_FS |
2516 | rc = dasd_proc_init(); | |
2517 | if (rc) | |
2518 | goto failed; | |
2519 | #endif | |
2520 | ||
2521 | return 0; | |
2522 | failed: | |
fc19f381 | 2523 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
2524 | dasd_exit(); |
2525 | return rc; | |
2526 | } | |
2527 | ||
2528 | module_init(dasd_init); | |
2529 | module_exit(dasd_exit); | |
2530 | ||
2531 | EXPORT_SYMBOL(dasd_debug_area); | |
2532 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2533 | ||
2534 | EXPORT_SYMBOL(dasd_add_request_head); | |
2535 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2536 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2537 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2538 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2539 | EXPORT_SYMBOL(dasd_enable_device); |
2540 | EXPORT_SYMBOL(dasd_int_handler); | |
2541 | EXPORT_SYMBOL(dasd_kfree_request); | |
2542 | EXPORT_SYMBOL(dasd_kick_device); | |
2543 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2544 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2545 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2546 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2547 | EXPORT_SYMBOL(dasd_device_set_timer); |
2548 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2549 | EXPORT_SYMBOL(dasd_sfree_request); |
2550 | EXPORT_SYMBOL(dasd_sleep_on); | |
2551 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2552 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2553 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2554 | EXPORT_SYMBOL(dasd_start_IO); | |
2555 | EXPORT_SYMBOL(dasd_term_IO); | |
2556 | ||
2557 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2558 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2559 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2560 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2561 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2562 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2563 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2564 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2565 | EXPORT_SYMBOL_GPL(dasd_free_block); |