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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
d41dd122 | 8 | * Copyright IBM Corp. 1999, 2009 |
1da177e4 LT |
9 | */ |
10 | ||
fc19f381 SH |
11 | #define KMSG_COMPONENT "dasd" |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
1da177e4 LT |
14 | #include <linux/kmod.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/buffer_head.h> | |
a885c8c4 | 21 | #include <linux/hdreg.h> |
f3445a1a | 22 | #include <linux/async.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 *); |
d41dd122 | 63 | static void do_restore_device(struct work_struct *); |
8e09f215 | 64 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
65 | static void dasd_device_timeout(unsigned long); |
66 | static void dasd_block_timeout(unsigned long); | |
1da177e4 LT |
67 | |
68 | /* | |
69 | * SECTION: Operations on the device structure. | |
70 | */ | |
71 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 72 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 73 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
74 | |
75 | /* | |
76 | * Allocate memory for a new device structure. | |
77 | */ | |
8e09f215 | 78 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
79 | { |
80 | struct dasd_device *device; | |
81 | ||
8e09f215 SW |
82 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
83 | if (!device) | |
1da177e4 | 84 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
85 | |
86 | /* Get two pages for normal block device operations. */ | |
87 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 88 | if (!device->ccw_mem) { |
1da177e4 LT |
89 | kfree(device); |
90 | return ERR_PTR(-ENOMEM); | |
91 | } | |
92 | /* Get one page for error recovery. */ | |
93 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 94 | if (!device->erp_mem) { |
1da177e4 LT |
95 | free_pages((unsigned long) device->ccw_mem, 1); |
96 | kfree(device); | |
97 | return ERR_PTR(-ENOMEM); | |
98 | } | |
99 | ||
100 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
101 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
102 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 103 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 104 | tasklet_init(&device->tasklet, |
8e09f215 | 105 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
106 | (unsigned long) device); |
107 | INIT_LIST_HEAD(&device->ccw_queue); | |
108 | init_timer(&device->timer); | |
48cae885 SW |
109 | device->timer.function = dasd_device_timeout; |
110 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 111 | INIT_WORK(&device->kick_work, do_kick_device); |
d41dd122 | 112 | INIT_WORK(&device->restore_device, do_restore_device); |
1da177e4 LT |
113 | device->state = DASD_STATE_NEW; |
114 | device->target = DASD_STATE_NEW; | |
115 | ||
116 | return device; | |
117 | } | |
118 | ||
119 | /* | |
120 | * Free memory of a device structure. | |
121 | */ | |
8e09f215 | 122 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 123 | { |
17fd682e | 124 | kfree(device->private); |
1da177e4 LT |
125 | free_page((unsigned long) device->erp_mem); |
126 | free_pages((unsigned long) device->ccw_mem, 1); | |
127 | kfree(device); | |
128 | } | |
129 | ||
8e09f215 SW |
130 | /* |
131 | * Allocate memory for a new device structure. | |
132 | */ | |
133 | struct dasd_block *dasd_alloc_block(void) | |
134 | { | |
135 | struct dasd_block *block; | |
136 | ||
137 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
138 | if (!block) | |
139 | return ERR_PTR(-ENOMEM); | |
140 | /* open_count = 0 means device online but not in use */ | |
141 | atomic_set(&block->open_count, -1); | |
142 | ||
143 | spin_lock_init(&block->request_queue_lock); | |
144 | atomic_set(&block->tasklet_scheduled, 0); | |
145 | tasklet_init(&block->tasklet, | |
146 | (void (*)(unsigned long)) dasd_block_tasklet, | |
147 | (unsigned long) block); | |
148 | INIT_LIST_HEAD(&block->ccw_queue); | |
149 | spin_lock_init(&block->queue_lock); | |
150 | init_timer(&block->timer); | |
48cae885 SW |
151 | block->timer.function = dasd_block_timeout; |
152 | block->timer.data = (unsigned long) block; | |
8e09f215 SW |
153 | |
154 | return block; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Free memory of a device structure. | |
159 | */ | |
160 | void dasd_free_block(struct dasd_block *block) | |
161 | { | |
162 | kfree(block); | |
163 | } | |
164 | ||
1da177e4 LT |
165 | /* |
166 | * Make a new device known to the system. | |
167 | */ | |
8e09f215 | 168 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
169 | { |
170 | int rc; | |
171 | ||
172 | /* | |
138c014d | 173 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
174 | * keep the reference count > 0. |
175 | */ | |
176 | dasd_get_device(device); | |
177 | ||
8e09f215 SW |
178 | if (device->block) { |
179 | rc = dasd_alloc_queue(device->block); | |
180 | if (rc) { | |
181 | dasd_put_device(device); | |
182 | return rc; | |
183 | } | |
1da177e4 | 184 | } |
1da177e4 LT |
185 | device->state = DASD_STATE_KNOWN; |
186 | return 0; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Let the system forget about a device. | |
191 | */ | |
8e09f215 | 192 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 193 | { |
20c64468 SW |
194 | /* Disable extended error reporting for this device. */ |
195 | dasd_eer_disable(device); | |
1da177e4 | 196 | /* Forget the discipline information. */ |
8e09f215 SW |
197 | if (device->discipline) { |
198 | if (device->discipline->uncheck_device) | |
199 | device->discipline->uncheck_device(device); | |
aa88861f | 200 | module_put(device->discipline->owner); |
8e09f215 | 201 | } |
1da177e4 | 202 | device->discipline = NULL; |
aa88861f PO |
203 | if (device->base_discipline) |
204 | module_put(device->base_discipline->owner); | |
205 | device->base_discipline = NULL; | |
1da177e4 LT |
206 | device->state = DASD_STATE_NEW; |
207 | ||
8e09f215 SW |
208 | if (device->block) |
209 | dasd_free_queue(device->block); | |
1da177e4 LT |
210 | |
211 | /* Give up reference we took in dasd_state_new_to_known. */ | |
212 | dasd_put_device(device); | |
8f61701b | 213 | return 0; |
1da177e4 LT |
214 | } |
215 | ||
216 | /* | |
217 | * Request the irq line for the device. | |
218 | */ | |
8e09f215 | 219 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
220 | { |
221 | int rc; | |
222 | ||
223 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
224 | if (device->block) { |
225 | rc = dasd_gendisk_alloc(device->block); | |
226 | if (rc) | |
227 | return rc; | |
228 | } | |
1da177e4 | 229 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 230 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 231 | 8 * sizeof(long)); |
1da177e4 | 232 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 233 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
234 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
235 | ||
236 | device->state = DASD_STATE_BASIC; | |
237 | return 0; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Release the irq line for the device. Terminate any running i/o. | |
242 | */ | |
8e09f215 | 243 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 244 | { |
8f61701b | 245 | int rc; |
8e09f215 SW |
246 | if (device->block) { |
247 | dasd_gendisk_free(device->block); | |
248 | dasd_block_clear_timer(device->block); | |
249 | } | |
250 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
251 | if (rc) |
252 | return rc; | |
8e09f215 | 253 | dasd_device_clear_timer(device); |
8f61701b | 254 | |
1da177e4 LT |
255 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
256 | if (device->debug_area != NULL) { | |
257 | debug_unregister(device->debug_area); | |
258 | device->debug_area = NULL; | |
259 | } | |
260 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 261 | return 0; |
1da177e4 LT |
262 | } |
263 | ||
264 | /* | |
265 | * Do the initial analysis. The do_analysis function may return | |
266 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
267 | * until the discipline decides to continue the startup sequence | |
268 | * by calling the function dasd_change_state. The eckd disciplines | |
269 | * uses this to start a ccw that detects the format. The completion | |
270 | * interrupt for this detection ccw uses the kernel event daemon to | |
271 | * trigger the call to dasd_change_state. All this is done in the | |
272 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
273 | * After the analysis ccw is done (do_analysis returned 0) the block |
274 | * device is setup. | |
275 | * In case the analysis returns an error, the device setup is stopped | |
276 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 277 | */ |
8e09f215 | 278 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
279 | { |
280 | int rc; | |
8e09f215 | 281 | struct dasd_block *block; |
1da177e4 LT |
282 | |
283 | rc = 0; | |
8e09f215 | 284 | block = device->block; |
90f0094d | 285 | /* make disk known with correct capacity */ |
8e09f215 SW |
286 | if (block) { |
287 | if (block->base->discipline->do_analysis != NULL) | |
288 | rc = block->base->discipline->do_analysis(block); | |
289 | if (rc) { | |
290 | if (rc != -EAGAIN) | |
291 | device->state = DASD_STATE_UNFMT; | |
292 | return rc; | |
293 | } | |
294 | dasd_setup_queue(block); | |
295 | set_capacity(block->gdp, | |
296 | block->blocks << block->s2b_shift); | |
297 | device->state = DASD_STATE_READY; | |
298 | rc = dasd_scan_partitions(block); | |
299 | if (rc) | |
300 | device->state = DASD_STATE_BASIC; | |
301 | } else { | |
302 | device->state = DASD_STATE_READY; | |
303 | } | |
90f0094d | 304 | return rc; |
1da177e4 LT |
305 | } |
306 | ||
307 | /* | |
308 | * Remove device from block device layer. Destroy dirty buffers. | |
309 | * Forget format information. Check if the target level is basic | |
310 | * and if it is create fake disk for formatting. | |
311 | */ | |
8e09f215 | 312 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 313 | { |
8f61701b HH |
314 | int rc; |
315 | ||
1da177e4 | 316 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
317 | if (device->block) { |
318 | struct dasd_block *block = device->block; | |
319 | rc = dasd_flush_block_queue(block); | |
320 | if (rc) { | |
321 | device->state = DASD_STATE_READY; | |
322 | return rc; | |
323 | } | |
324 | dasd_destroy_partitions(block); | |
325 | dasd_flush_request_queue(block); | |
326 | block->blocks = 0; | |
327 | block->bp_block = 0; | |
328 | block->s2b_shift = 0; | |
329 | } | |
8f61701b | 330 | return 0; |
1da177e4 LT |
331 | } |
332 | ||
90f0094d HH |
333 | /* |
334 | * Back to basic. | |
335 | */ | |
8e09f215 | 336 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
337 | { |
338 | device->state = DASD_STATE_BASIC; | |
8f61701b | 339 | return 0; |
90f0094d HH |
340 | } |
341 | ||
1da177e4 LT |
342 | /* |
343 | * Make the device online and schedule the bottom half to start | |
344 | * the requeueing of requests from the linux request queue to the | |
345 | * ccw queue. | |
346 | */ | |
8f61701b | 347 | static int |
1da177e4 LT |
348 | dasd_state_ready_to_online(struct dasd_device * device) |
349 | { | |
8e09f215 | 350 | int rc; |
1301809b SW |
351 | struct gendisk *disk; |
352 | struct disk_part_iter piter; | |
353 | struct hd_struct *part; | |
8e09f215 SW |
354 | |
355 | if (device->discipline->ready_to_online) { | |
356 | rc = device->discipline->ready_to_online(device); | |
357 | if (rc) | |
358 | return rc; | |
359 | } | |
1da177e4 | 360 | device->state = DASD_STATE_ONLINE; |
1301809b | 361 | if (device->block) { |
8e09f215 | 362 | dasd_schedule_block_bh(device->block); |
1301809b SW |
363 | disk = device->block->bdev->bd_disk; |
364 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
365 | while ((part = disk_part_iter_next(&piter))) | |
366 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
367 | disk_part_iter_exit(&piter); | |
368 | } | |
1da177e4 LT |
369 | return 0; |
370 | } | |
371 | ||
372 | /* | |
373 | * Stop the requeueing of requests again. | |
374 | */ | |
8e09f215 | 375 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 376 | { |
8e09f215 | 377 | int rc; |
1301809b SW |
378 | struct gendisk *disk; |
379 | struct disk_part_iter piter; | |
380 | struct hd_struct *part; | |
8e09f215 SW |
381 | |
382 | if (device->discipline->online_to_ready) { | |
383 | rc = device->discipline->online_to_ready(device); | |
384 | if (rc) | |
385 | return rc; | |
386 | } | |
1da177e4 | 387 | device->state = DASD_STATE_READY; |
1301809b SW |
388 | if (device->block) { |
389 | disk = device->block->bdev->bd_disk; | |
390 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
391 | while ((part = disk_part_iter_next(&piter))) | |
392 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
393 | disk_part_iter_exit(&piter); | |
394 | } | |
8f61701b | 395 | return 0; |
1da177e4 LT |
396 | } |
397 | ||
398 | /* | |
399 | * Device startup state changes. | |
400 | */ | |
8e09f215 | 401 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
402 | { |
403 | int rc; | |
404 | ||
405 | rc = 0; | |
406 | if (device->state == DASD_STATE_NEW && | |
407 | device->target >= DASD_STATE_KNOWN) | |
408 | rc = dasd_state_new_to_known(device); | |
409 | ||
410 | if (!rc && | |
411 | device->state == DASD_STATE_KNOWN && | |
412 | device->target >= DASD_STATE_BASIC) | |
413 | rc = dasd_state_known_to_basic(device); | |
414 | ||
415 | if (!rc && | |
416 | device->state == DASD_STATE_BASIC && | |
417 | device->target >= DASD_STATE_READY) | |
418 | rc = dasd_state_basic_to_ready(device); | |
419 | ||
39ccf95e HH |
420 | if (!rc && |
421 | device->state == DASD_STATE_UNFMT && | |
422 | device->target > DASD_STATE_UNFMT) | |
423 | rc = -EPERM; | |
424 | ||
1da177e4 LT |
425 | if (!rc && |
426 | device->state == DASD_STATE_READY && | |
427 | device->target >= DASD_STATE_ONLINE) | |
428 | rc = dasd_state_ready_to_online(device); | |
429 | ||
430 | return rc; | |
431 | } | |
432 | ||
433 | /* | |
434 | * Device shutdown state changes. | |
435 | */ | |
8e09f215 | 436 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 437 | { |
8f61701b HH |
438 | int rc; |
439 | ||
440 | rc = 0; | |
1da177e4 LT |
441 | if (device->state == DASD_STATE_ONLINE && |
442 | device->target <= DASD_STATE_READY) | |
8f61701b | 443 | rc = dasd_state_online_to_ready(device); |
138c014d | 444 | |
8f61701b HH |
445 | if (!rc && |
446 | device->state == DASD_STATE_READY && | |
1da177e4 | 447 | device->target <= DASD_STATE_BASIC) |
8f61701b | 448 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 449 | |
8f61701b HH |
450 | if (!rc && |
451 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 452 | device->target <= DASD_STATE_BASIC) |
8f61701b | 453 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 454 | |
8f61701b HH |
455 | if (!rc && |
456 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 457 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 458 | rc = dasd_state_basic_to_known(device); |
138c014d | 459 | |
8f61701b HH |
460 | if (!rc && |
461 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 462 | device->target <= DASD_STATE_NEW) |
8f61701b | 463 | rc = dasd_state_known_to_new(device); |
1da177e4 | 464 | |
8f61701b | 465 | return rc; |
1da177e4 LT |
466 | } |
467 | ||
468 | /* | |
469 | * This is the main startup/shutdown routine. | |
470 | */ | |
8e09f215 | 471 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 | 472 | { |
181d9522 | 473 | int rc; |
1da177e4 LT |
474 | |
475 | if (device->state == device->target) | |
476 | /* Already where we want to go today... */ | |
477 | return; | |
478 | if (device->state < device->target) | |
479 | rc = dasd_increase_state(device); | |
480 | else | |
481 | rc = dasd_decrease_state(device); | |
181d9522 SO |
482 | if (rc == -EAGAIN) |
483 | return; | |
484 | if (rc) | |
485 | device->target = device->state; | |
1da177e4 | 486 | |
f3445a1a | 487 | if (device->state == device->target) { |
1da177e4 | 488 | wake_up(&dasd_init_waitq); |
f3445a1a CH |
489 | dasd_put_device(device); |
490 | } | |
4dfd5c45 HH |
491 | |
492 | /* let user-space know that the device status changed */ | |
493 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
494 | } |
495 | ||
496 | /* | |
497 | * Kick starter for devices that did not complete the startup/shutdown | |
498 | * procedure or were sleeping because of a pending state. | |
499 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
500 | * event daemon. | |
501 | */ | |
8e09f215 | 502 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 503 | { |
4927b3f7 | 504 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
1da177e4 | 505 | dasd_change_state(device); |
8e09f215 | 506 | dasd_schedule_device_bh(device); |
1da177e4 LT |
507 | dasd_put_device(device); |
508 | } | |
509 | ||
8e09f215 | 510 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
511 | { |
512 | dasd_get_device(device); | |
513 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
514 | schedule_work(&device->kick_work); | |
515 | } | |
516 | ||
d41dd122 SH |
517 | /* |
518 | * dasd_restore_device will schedule a call do do_restore_device to the kernel | |
519 | * event daemon. | |
520 | */ | |
521 | static void do_restore_device(struct work_struct *work) | |
522 | { | |
523 | struct dasd_device *device = container_of(work, struct dasd_device, | |
524 | restore_device); | |
525 | device->cdev->drv->restore(device->cdev); | |
526 | dasd_put_device(device); | |
527 | } | |
528 | ||
529 | void dasd_restore_device(struct dasd_device *device) | |
530 | { | |
531 | dasd_get_device(device); | |
532 | /* queue call to dasd_restore_device to the kernel event daemon. */ | |
533 | schedule_work(&device->restore_device); | |
534 | } | |
535 | ||
1da177e4 LT |
536 | /* |
537 | * Set the target state for a device and starts the state change. | |
538 | */ | |
8e09f215 | 539 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 540 | { |
f3445a1a | 541 | dasd_get_device(device); |
1da177e4 LT |
542 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
543 | if (dasd_probeonly && target > DASD_STATE_READY) | |
544 | target = DASD_STATE_READY; | |
545 | if (device->target != target) { | |
f3445a1a | 546 | if (device->state == target) { |
1da177e4 | 547 | wake_up(&dasd_init_waitq); |
f3445a1a CH |
548 | dasd_put_device(device); |
549 | } | |
1da177e4 LT |
550 | device->target = target; |
551 | } | |
552 | if (device->state != device->target) | |
553 | dasd_change_state(device); | |
554 | } | |
555 | ||
556 | /* | |
557 | * Enable devices with device numbers in [from..to]. | |
558 | */ | |
8e09f215 | 559 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
560 | { |
561 | return (device->state == device->target); | |
562 | } | |
563 | ||
8e09f215 | 564 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
565 | { |
566 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
567 | if (device->state <= DASD_STATE_KNOWN) | |
568 | /* No discipline for device found. */ | |
569 | dasd_set_target_state(device, DASD_STATE_NEW); | |
570 | /* Now wait for the devices to come up. */ | |
571 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
572 | } | |
573 | ||
574 | /* | |
575 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
576 | */ | |
577 | #ifdef CONFIG_DASD_PROFILE | |
578 | ||
579 | struct dasd_profile_info_t dasd_global_profile; | |
580 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
581 | ||
582 | /* | |
583 | * Increments counter in global and local profiling structures. | |
584 | */ | |
8e09f215 | 585 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
586 | { \ |
587 | int index; \ | |
588 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
589 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 590 | block->profile.counter[index]++; \ |
1da177e4 LT |
591 | } |
592 | ||
593 | /* | |
594 | * Add profiling information for cqr before execution. | |
595 | */ | |
8e09f215 SW |
596 | static void dasd_profile_start(struct dasd_block *block, |
597 | struct dasd_ccw_req *cqr, | |
598 | struct request *req) | |
1da177e4 LT |
599 | { |
600 | struct list_head *l; | |
601 | unsigned int counter; | |
602 | ||
603 | if (dasd_profile_level != DASD_PROFILE_ON) | |
604 | return; | |
605 | ||
606 | /* count the length of the chanq for statistics */ | |
607 | counter = 0; | |
8e09f215 | 608 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
609 | if (++counter >= 31) |
610 | break; | |
611 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 612 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
613 | } |
614 | ||
615 | /* | |
616 | * Add profiling information for cqr after execution. | |
617 | */ | |
8e09f215 SW |
618 | static void dasd_profile_end(struct dasd_block *block, |
619 | struct dasd_ccw_req *cqr, | |
620 | struct request *req) | |
1da177e4 LT |
621 | { |
622 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
623 | long tottimeps, sectors; | |
624 | ||
625 | if (dasd_profile_level != DASD_PROFILE_ON) | |
626 | return; | |
627 | ||
83096ebf | 628 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
629 | if (!cqr->buildclk || !cqr->startclk || |
630 | !cqr->stopclk || !cqr->endclk || | |
631 | !sectors) | |
632 | return; | |
633 | ||
634 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
635 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
636 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
637 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
638 | tottimeps = tottime / sectors; | |
639 | ||
640 | if (!dasd_global_profile.dasd_io_reqs) | |
641 | memset(&dasd_global_profile, 0, | |
8e09f215 | 642 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
643 | dasd_global_profile.dasd_io_reqs++; |
644 | dasd_global_profile.dasd_io_sects += sectors; | |
645 | ||
8e09f215 SW |
646 | if (!block->profile.dasd_io_reqs) |
647 | memset(&block->profile, 0, | |
648 | sizeof(struct dasd_profile_info_t)); | |
649 | block->profile.dasd_io_reqs++; | |
650 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 651 | |
8e09f215 SW |
652 | dasd_profile_counter(sectors, dasd_io_secs, block); |
653 | dasd_profile_counter(tottime, dasd_io_times, block); | |
654 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
655 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
656 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
657 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
658 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
659 | } |
660 | #else | |
8e09f215 SW |
661 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
662 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
663 | #endif /* CONFIG_DASD_PROFILE */ |
664 | ||
665 | /* | |
666 | * Allocate memory for a channel program with 'cplength' channel | |
667 | * command words and 'datasize' additional space. There are two | |
668 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
669 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
670 | * that gets allocated for each device. | |
671 | */ | |
68b781fe | 672 | struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, |
8e09f215 SW |
673 | int datasize, |
674 | struct dasd_device *device) | |
1da177e4 LT |
675 | { |
676 | struct dasd_ccw_req *cqr; | |
677 | ||
678 | /* Sanity checks */ | |
68b781fe | 679 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 680 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 | 681 | |
88abaab4 | 682 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
683 | if (cqr == NULL) |
684 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
685 | cqr->cpaddr = NULL; |
686 | if (cplength > 0) { | |
88abaab4 | 687 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
688 | GFP_ATOMIC | GFP_DMA); |
689 | if (cqr->cpaddr == NULL) { | |
690 | kfree(cqr); | |
691 | return ERR_PTR(-ENOMEM); | |
692 | } | |
1da177e4 LT |
693 | } |
694 | cqr->data = NULL; | |
695 | if (datasize > 0) { | |
88abaab4 | 696 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 697 | if (cqr->data == NULL) { |
17fd682e | 698 | kfree(cqr->cpaddr); |
1da177e4 LT |
699 | kfree(cqr); |
700 | return ERR_PTR(-ENOMEM); | |
701 | } | |
1da177e4 | 702 | } |
68b781fe | 703 | cqr->magic = magic; |
1da177e4 LT |
704 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
705 | dasd_get_device(device); | |
706 | return cqr; | |
707 | } | |
708 | ||
68b781fe | 709 | struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
8e09f215 SW |
710 | int datasize, |
711 | struct dasd_device *device) | |
1da177e4 LT |
712 | { |
713 | unsigned long flags; | |
714 | struct dasd_ccw_req *cqr; | |
715 | char *data; | |
716 | int size; | |
717 | ||
718 | /* Sanity checks */ | |
68b781fe | 719 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 720 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 LT |
721 | |
722 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
723 | if (cplength > 0) | |
724 | size += cplength * sizeof(struct ccw1); | |
725 | if (datasize > 0) | |
726 | size += datasize; | |
727 | spin_lock_irqsave(&device->mem_lock, flags); | |
728 | cqr = (struct dasd_ccw_req *) | |
729 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
730 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
731 | if (cqr == NULL) | |
732 | return ERR_PTR(-ENOMEM); | |
733 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
734 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
735 | cqr->cpaddr = NULL; | |
736 | if (cplength > 0) { | |
737 | cqr->cpaddr = (struct ccw1 *) data; | |
738 | data += cplength*sizeof(struct ccw1); | |
739 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
740 | } | |
741 | cqr->data = NULL; | |
742 | if (datasize > 0) { | |
743 | cqr->data = data; | |
744 | memset(cqr->data, 0, datasize); | |
745 | } | |
68b781fe | 746 | cqr->magic = magic; |
1da177e4 LT |
747 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
748 | dasd_get_device(device); | |
749 | return cqr; | |
750 | } | |
751 | ||
752 | /* | |
753 | * Free memory of a channel program. This function needs to free all the | |
754 | * idal lists that might have been created by dasd_set_cda and the | |
755 | * struct dasd_ccw_req itself. | |
756 | */ | |
8e09f215 | 757 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 758 | { |
347a8dc3 | 759 | #ifdef CONFIG_64BIT |
1da177e4 LT |
760 | struct ccw1 *ccw; |
761 | ||
762 | /* Clear any idals used for the request. */ | |
763 | ccw = cqr->cpaddr; | |
764 | do { | |
765 | clear_normalized_cda(ccw); | |
766 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
767 | #endif | |
17fd682e JJ |
768 | kfree(cqr->cpaddr); |
769 | kfree(cqr->data); | |
1da177e4 LT |
770 | kfree(cqr); |
771 | dasd_put_device(device); | |
772 | } | |
773 | ||
8e09f215 | 774 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
775 | { |
776 | unsigned long flags; | |
777 | ||
778 | spin_lock_irqsave(&device->mem_lock, flags); | |
779 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
780 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
781 | dasd_put_device(device); | |
782 | } | |
783 | ||
784 | /* | |
785 | * Check discipline magic in cqr. | |
786 | */ | |
8e09f215 | 787 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
788 | { |
789 | struct dasd_device *device; | |
790 | ||
791 | if (cqr == NULL) | |
792 | return -EINVAL; | |
8e09f215 | 793 | device = cqr->startdev; |
1da177e4 | 794 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 795 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
796 | " dasd_ccw_req 0x%08x magic doesn't match" |
797 | " discipline 0x%08x", | |
798 | cqr->magic, | |
799 | *(unsigned int *) device->discipline->name); | |
800 | return -EINVAL; | |
801 | } | |
802 | return 0; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Terminate the current i/o and set the request to clear_pending. | |
807 | * Timer keeps device runnig. | |
808 | * ccw_device_clear can fail if the i/o subsystem | |
809 | * is in a bad mood. | |
810 | */ | |
8e09f215 | 811 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
812 | { |
813 | struct dasd_device *device; | |
814 | int retries, rc; | |
fc19f381 | 815 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
816 | |
817 | /* Check the cqr */ | |
818 | rc = dasd_check_cqr(cqr); | |
819 | if (rc) | |
820 | return rc; | |
821 | retries = 0; | |
8e09f215 | 822 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
823 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
824 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
825 | switch (rc) { | |
826 | case 0: /* termination successful */ | |
c2ba444d | 827 | cqr->retries--; |
8e09f215 | 828 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 829 | cqr->stopclk = get_clock(); |
8f61701b | 830 | cqr->starttime = 0; |
1da177e4 LT |
831 | DBF_DEV_EVENT(DBF_DEBUG, device, |
832 | "terminate cqr %p successful", | |
833 | cqr); | |
834 | break; | |
835 | case -ENODEV: | |
836 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
837 | "device gone, retry"); | |
838 | break; | |
839 | case -EIO: | |
840 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
841 | "I/O error, retry"); | |
842 | break; | |
843 | case -EINVAL: | |
844 | case -EBUSY: | |
845 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
846 | "device busy, retry later"); | |
847 | break; | |
848 | default: | |
fc19f381 SH |
849 | /* internal error 10 - unknown rc*/ |
850 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
851 | dev_err(&device->cdev->dev, "An error occurred in the " | |
852 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
853 | BUG(); |
854 | break; | |
855 | } | |
856 | retries++; | |
857 | } | |
8e09f215 | 858 | dasd_schedule_device_bh(device); |
1da177e4 LT |
859 | return rc; |
860 | } | |
861 | ||
862 | /* | |
863 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
864 | * In that case set up a timer to start the request later. | |
865 | */ | |
8e09f215 | 866 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
867 | { |
868 | struct dasd_device *device; | |
869 | int rc; | |
fc19f381 | 870 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
871 | |
872 | /* Check the cqr */ | |
873 | rc = dasd_check_cqr(cqr); | |
6cc7f168 SW |
874 | if (rc) { |
875 | cqr->intrc = rc; | |
1da177e4 | 876 | return rc; |
6cc7f168 | 877 | } |
8e09f215 | 878 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 879 | if (cqr->retries < 0) { |
fc19f381 SH |
880 | /* internal error 14 - start_IO run out of retries */ |
881 | sprintf(errorstring, "14 %p", cqr); | |
882 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
883 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 884 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
885 | return -EIO; |
886 | } | |
887 | cqr->startclk = get_clock(); | |
888 | cqr->starttime = jiffies; | |
889 | cqr->retries--; | |
f3eb5384 SW |
890 | if (cqr->cpmode == 1) { |
891 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
892 | (long) cqr, cqr->lpm); | |
893 | } else { | |
894 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
895 | (long) cqr, cqr->lpm, 0); | |
896 | } | |
1da177e4 LT |
897 | switch (rc) { |
898 | case 0: | |
899 | cqr->status = DASD_CQR_IN_IO; | |
1da177e4 LT |
900 | break; |
901 | case -EBUSY: | |
fc19f381 | 902 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
903 | "start_IO: device busy, retry later"); |
904 | break; | |
905 | case -ETIMEDOUT: | |
fc19f381 | 906 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
907 | "start_IO: request timeout, retry later"); |
908 | break; | |
909 | case -EACCES: | |
910 | /* -EACCES indicates that the request used only a | |
911 | * subset of the available pathes and all these | |
912 | * pathes are gone. | |
913 | * Do a retry with all available pathes. | |
914 | */ | |
915 | cqr->lpm = LPM_ANYPATH; | |
fc19f381 | 916 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
917 | "start_IO: selected pathes gone," |
918 | " retry on all pathes"); | |
919 | break; | |
920 | case -ENODEV: | |
f3eb5384 SW |
921 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
922 | "start_IO: -ENODEV device gone, retry"); | |
923 | break; | |
1da177e4 | 924 | case -EIO: |
fc19f381 | 925 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
f3eb5384 | 926 | "start_IO: -EIO device gone, retry"); |
1da177e4 | 927 | break; |
d41dd122 SH |
928 | case -EINVAL: |
929 | /* most likely caused in power management context */ | |
930 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", | |
931 | "start_IO: -EINVAL device currently " | |
932 | "not accessible"); | |
933 | break; | |
1da177e4 | 934 | default: |
fc19f381 SH |
935 | /* internal error 11 - unknown rc */ |
936 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
937 | dev_err(&device->cdev->dev, | |
938 | "An error occurred in the DASD device driver, " | |
939 | "reason=%s\n", errorstring); | |
1da177e4 LT |
940 | BUG(); |
941 | break; | |
942 | } | |
6cc7f168 | 943 | cqr->intrc = rc; |
1da177e4 LT |
944 | return rc; |
945 | } | |
946 | ||
947 | /* | |
948 | * Timeout function for dasd devices. This is used for different purposes | |
949 | * 1) missing interrupt handler for normal operation | |
950 | * 2) delayed start of request where start_IO failed with -EBUSY | |
951 | * 3) timeout for missing state change interrupts | |
952 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
953 | * DASD_CQR_QUEUED for 2) and 3). | |
954 | */ | |
8e09f215 | 955 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
956 | { |
957 | unsigned long flags; | |
958 | struct dasd_device *device; | |
959 | ||
960 | device = (struct dasd_device *) ptr; | |
961 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
962 | /* re-activate request queue */ | |
963 | device->stopped &= ~DASD_STOPPED_PENDING; | |
964 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
8e09f215 | 965 | dasd_schedule_device_bh(device); |
1da177e4 LT |
966 | } |
967 | ||
968 | /* | |
969 | * Setup timeout for a device in jiffies. | |
970 | */ | |
8e09f215 | 971 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 972 | { |
48cae885 SW |
973 | if (expires == 0) |
974 | del_timer(&device->timer); | |
975 | else | |
976 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 LT |
977 | } |
978 | ||
979 | /* | |
980 | * Clear timeout for a device. | |
981 | */ | |
8e09f215 | 982 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 983 | { |
48cae885 | 984 | del_timer(&device->timer); |
1da177e4 LT |
985 | } |
986 | ||
8e09f215 SW |
987 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
988 | unsigned long intparm) | |
1da177e4 LT |
989 | { |
990 | struct dasd_ccw_req *cqr; | |
991 | struct dasd_device *device; | |
992 | ||
f16f5843 SW |
993 | if (!intparm) |
994 | return; | |
1da177e4 LT |
995 | cqr = (struct dasd_ccw_req *) intparm; |
996 | if (cqr->status != DASD_CQR_IN_IO) { | |
fc19f381 | 997 | DBF_EVENT(DBF_DEBUG, |
1da177e4 LT |
998 | "invalid status in handle_killed_request: " |
999 | "bus_id %s, status %02x", | |
2a0217d5 | 1000 | dev_name(&cdev->dev), cqr->status); |
1da177e4 LT |
1001 | return; |
1002 | } | |
1003 | ||
8e09f215 | 1004 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 1005 | if (device == NULL || |
a00bfd71 | 1006 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 | 1007 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 SH |
1008 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid device in request: " |
1009 | "bus_id %s", dev_name(&cdev->dev)); | |
1da177e4 LT |
1010 | return; |
1011 | } | |
1012 | ||
1013 | /* Schedule request to be retried. */ | |
1014 | cqr->status = DASD_CQR_QUEUED; | |
1015 | ||
8e09f215 SW |
1016 | dasd_device_clear_timer(device); |
1017 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1018 | dasd_put_device(device); |
1019 | } | |
1020 | ||
8e09f215 | 1021 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 1022 | { |
20c64468 SW |
1023 | /* First of all start sense subsystem status request. */ |
1024 | dasd_eer_snss(device); | |
1025 | ||
1da177e4 | 1026 | device->stopped &= ~DASD_STOPPED_PENDING; |
8e09f215 SW |
1027 | dasd_schedule_device_bh(device); |
1028 | if (device->block) | |
1029 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | /* | |
1033 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1034 | */ | |
8e09f215 SW |
1035 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1036 | struct irb *irb) | |
1da177e4 LT |
1037 | { |
1038 | struct dasd_ccw_req *cqr, *next; | |
1039 | struct dasd_device *device; | |
1040 | unsigned long long now; | |
1041 | int expires; | |
1da177e4 LT |
1042 | |
1043 | if (IS_ERR(irb)) { | |
1044 | switch (PTR_ERR(irb)) { | |
1045 | case -EIO: | |
1da177e4 LT |
1046 | break; |
1047 | case -ETIMEDOUT: | |
fc19f381 | 1048 | DBF_EVENT(DBF_WARNING, "%s(%s): request timed out\n", |
2a0217d5 | 1049 | __func__, dev_name(&cdev->dev)); |
1da177e4 LT |
1050 | break; |
1051 | default: | |
fc19f381 | 1052 | DBF_EVENT(DBF_WARNING, "%s(%s): unknown error %ld\n", |
2a0217d5 | 1053 | __func__, dev_name(&cdev->dev), PTR_ERR(irb)); |
1da177e4 | 1054 | } |
f16f5843 | 1055 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1056 | return; |
1057 | } | |
1058 | ||
1059 | now = get_clock(); | |
1060 | ||
8e09f215 SW |
1061 | /* check for unsolicited interrupts */ |
1062 | cqr = (struct dasd_ccw_req *) intparm; | |
f3eb5384 SW |
1063 | if (!cqr || ((scsw_cc(&irb->scsw) == 1) && |
1064 | (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) && | |
1065 | (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) { | |
8e09f215 SW |
1066 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
1067 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1068 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1069 | if (!IS_ERR(device)) { |
8e09f215 SW |
1070 | dasd_device_clear_timer(device); |
1071 | device->discipline->handle_unsolicited_interrupt(device, | |
1072 | irb); | |
1da177e4 LT |
1073 | dasd_put_device(device); |
1074 | } | |
1075 | return; | |
1076 | } | |
1077 | ||
8e09f215 SW |
1078 | device = (struct dasd_device *) cqr->startdev; |
1079 | if (!device || | |
1da177e4 | 1080 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 SH |
1081 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid device in request: " |
1082 | "bus_id %s", dev_name(&cdev->dev)); | |
1da177e4 LT |
1083 | return; |
1084 | } | |
1085 | ||
1086 | /* Check for clear pending */ | |
8e09f215 | 1087 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1088 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1089 | cqr->status = DASD_CQR_CLEARED; |
1090 | dasd_device_clear_timer(device); | |
8f61701b | 1091 | wake_up(&dasd_flush_wq); |
8e09f215 | 1092 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1093 | return; |
1094 | } | |
1095 | ||
f3eb5384 | 1096 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1097 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1098 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1099 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1100 | return; |
1101 | } | |
fc19f381 | 1102 | |
8e09f215 | 1103 | next = NULL; |
1da177e4 | 1104 | expires = 0; |
f3eb5384 SW |
1105 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1106 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1107 | /* request was completed successfully */ |
1108 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1109 | cqr->stopclk = now; |
1110 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1111 | if (cqr->devlist.next != &device->ccw_queue) { |
1112 | next = list_entry(cqr->devlist.next, | |
1113 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1114 | } |
8e09f215 SW |
1115 | } else { /* error */ |
1116 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
fc19f381 SH |
1117 | /* log sense for every failed I/O to s390 debugfeature */ |
1118 | dasd_log_sense_dbf(cqr, irb); | |
9575bf26 | 1119 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1120 | dasd_log_sense(cqr, irb); |
1121 | } | |
fc19f381 | 1122 | |
6c5f57c7 SH |
1123 | /* |
1124 | * If we don't want complex ERP for this request, then just | |
1125 | * reset this and retry it in the fastpath | |
8e09f215 | 1126 | */ |
6c5f57c7 | 1127 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1128 | cqr->retries > 0) { |
fc19f381 SH |
1129 | if (cqr->lpm == LPM_ANYPATH) |
1130 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
1131 | "default ERP in fastpath " | |
1132 | "(%i retries left)", | |
1133 | cqr->retries); | |
8e09f215 SW |
1134 | cqr->lpm = LPM_ANYPATH; |
1135 | cqr->status = DASD_CQR_QUEUED; | |
1136 | next = cqr; | |
1137 | } else | |
1da177e4 | 1138 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1139 | } |
1140 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1141 | (!device->stopped)) { | |
1142 | if (device->discipline->start_IO(next) == 0) | |
1143 | expires = next->expires; | |
1da177e4 LT |
1144 | } |
1145 | if (expires != 0) | |
8e09f215 | 1146 | dasd_device_set_timer(device, expires); |
1da177e4 | 1147 | else |
8e09f215 SW |
1148 | dasd_device_clear_timer(device); |
1149 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | /* | |
8e09f215 SW |
1153 | * If we have an error on a dasd_block layer request then we cancel |
1154 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1155 | */ |
8e09f215 SW |
1156 | static void __dasd_device_recovery(struct dasd_device *device, |
1157 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1158 | { |
8e09f215 SW |
1159 | struct list_head *l, *n; |
1160 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1161 | |
8e09f215 SW |
1162 | /* |
1163 | * only requeue request that came from the dasd_block layer | |
1164 | */ | |
1165 | if (!ref_cqr->block) | |
1166 | return; | |
1da177e4 | 1167 | |
8e09f215 SW |
1168 | list_for_each_safe(l, n, &device->ccw_queue) { |
1169 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1170 | if (cqr->status == DASD_CQR_QUEUED && | |
1171 | ref_cqr->block == cqr->block) { | |
1172 | cqr->status = DASD_CQR_CLEARED; | |
1173 | } | |
1174 | } | |
1175 | }; | |
1da177e4 LT |
1176 | |
1177 | /* | |
8e09f215 SW |
1178 | * Remove those ccw requests from the queue that need to be returned |
1179 | * to the upper layer. | |
1da177e4 | 1180 | */ |
8e09f215 SW |
1181 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1182 | struct list_head *final_queue) | |
1da177e4 LT |
1183 | { |
1184 | struct list_head *l, *n; | |
1185 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1186 | |
1da177e4 LT |
1187 | /* Process request with final status. */ |
1188 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1189 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1190 | ||
1da177e4 | 1191 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1192 | if (cqr->status == DASD_CQR_QUEUED || |
1193 | cqr->status == DASD_CQR_IN_IO || | |
1194 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1195 | break; |
1da177e4 | 1196 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1197 | __dasd_device_recovery(device, cqr); |
20c64468 | 1198 | } |
1da177e4 | 1199 | /* Rechain finished requests to final queue */ |
8e09f215 | 1200 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1201 | } |
1202 | } | |
1203 | ||
1da177e4 | 1204 | /* |
8e09f215 SW |
1205 | * the cqrs from the final queue are returned to the upper layer |
1206 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1207 | */ |
8e09f215 SW |
1208 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1209 | struct list_head *final_queue) | |
1da177e4 | 1210 | { |
8e09f215 | 1211 | struct list_head *l, *n; |
1da177e4 | 1212 | struct dasd_ccw_req *cqr; |
03513bcc | 1213 | struct dasd_block *block; |
c80ee724 SH |
1214 | void (*callback)(struct dasd_ccw_req *, void *data); |
1215 | void *callback_data; | |
fc19f381 | 1216 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1217 | |
8e09f215 SW |
1218 | list_for_each_safe(l, n, final_queue) { |
1219 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1220 | list_del_init(&cqr->devlist); | |
03513bcc | 1221 | block = cqr->block; |
c80ee724 SH |
1222 | callback = cqr->callback; |
1223 | callback_data = cqr->callback_data; | |
03513bcc SW |
1224 | if (block) |
1225 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1226 | switch (cqr->status) { |
1227 | case DASD_CQR_SUCCESS: | |
1228 | cqr->status = DASD_CQR_DONE; | |
1229 | break; | |
1230 | case DASD_CQR_ERROR: | |
1231 | cqr->status = DASD_CQR_NEED_ERP; | |
1232 | break; | |
1233 | case DASD_CQR_CLEARED: | |
1234 | cqr->status = DASD_CQR_TERMINATED; | |
1235 | break; | |
1236 | default: | |
fc19f381 SH |
1237 | /* internal error 12 - wrong cqr status*/ |
1238 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1239 | dev_err(&device->cdev->dev, | |
1240 | "An error occurred in the DASD device driver, " | |
1241 | "reason=%s\n", errorstring); | |
8e09f215 | 1242 | BUG(); |
1da177e4 | 1243 | } |
8e09f215 | 1244 | if (cqr->callback != NULL) |
c80ee724 | 1245 | (callback)(cqr, callback_data); |
03513bcc SW |
1246 | if (block) |
1247 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1248 | } |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * Take a look at the first request on the ccw queue and check | |
1253 | * if it reached its expire time. If so, terminate the IO. | |
1254 | */ | |
8e09f215 | 1255 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1256 | { |
1257 | struct dasd_ccw_req *cqr; | |
1258 | ||
1259 | if (list_empty(&device->ccw_queue)) | |
1260 | return; | |
8e09f215 | 1261 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1262 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1263 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1264 | if (device->discipline->term_IO(cqr) != 0) { | |
1265 | /* Hmpf, try again in 5 sec */ | |
fc19f381 SH |
1266 | dev_err(&device->cdev->dev, |
1267 | "cqr %p timed out (%is) but cannot be " | |
1268 | "ended, retrying in 5 s\n", | |
1269 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1270 | cqr->expires += 5*HZ; |
1271 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1272 | } else { |
fc19f381 SH |
1273 | dev_err(&device->cdev->dev, |
1274 | "cqr %p timed out (%is), %i retries " | |
1275 | "remaining\n", cqr, (cqr->expires/HZ), | |
1276 | cqr->retries); | |
1da177e4 LT |
1277 | } |
1278 | } | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * Take a look at the first request on the ccw queue and check | |
1283 | * if it needs to be started. | |
1284 | */ | |
8e09f215 | 1285 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1286 | { |
1287 | struct dasd_ccw_req *cqr; | |
1288 | int rc; | |
1289 | ||
1290 | if (list_empty(&device->ccw_queue)) | |
1291 | return; | |
8e09f215 | 1292 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1293 | if (cqr->status != DASD_CQR_QUEUED) |
1294 | return; | |
8e09f215 SW |
1295 | /* when device is stopped, return request to previous layer */ |
1296 | if (device->stopped) { | |
1297 | cqr->status = DASD_CQR_CLEARED; | |
1298 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1299 | return; |
1c01b8a5 | 1300 | } |
25ee4cf8 PO |
1301 | |
1302 | rc = device->discipline->start_IO(cqr); | |
1303 | if (rc == 0) | |
8e09f215 | 1304 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1305 | else if (rc == -EACCES) { |
8e09f215 | 1306 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1307 | } else |
1308 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1309 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1310 | } |
1311 | ||
1da177e4 | 1312 | /* |
8e09f215 SW |
1313 | * Go through all request on the dasd_device request queue, |
1314 | * terminate them on the cdev if necessary, and return them to the | |
1315 | * submitting layer via callback. | |
1316 | * Note: | |
1317 | * Make sure that all 'submitting layers' still exist when | |
1318 | * this function is called!. In other words, when 'device' is a base | |
1319 | * device then all block layer requests must have been removed before | |
1320 | * via dasd_flush_block_queue. | |
1da177e4 | 1321 | */ |
8e09f215 | 1322 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1323 | { |
8e09f215 SW |
1324 | struct dasd_ccw_req *cqr, *n; |
1325 | int rc; | |
1da177e4 | 1326 | struct list_head flush_queue; |
1da177e4 LT |
1327 | |
1328 | INIT_LIST_HEAD(&flush_queue); | |
1329 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1330 | rc = 0; |
8e09f215 | 1331 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1332 | /* Check status and move request to flush_queue */ |
1333 | switch (cqr->status) { | |
1334 | case DASD_CQR_IN_IO: | |
1335 | rc = device->discipline->term_IO(cqr); | |
1336 | if (rc) { | |
1337 | /* unable to terminate requeust */ | |
fc19f381 SH |
1338 | dev_err(&device->cdev->dev, |
1339 | "Flushing the DASD request queue " | |
1340 | "failed for request %p\n", cqr); | |
8f61701b HH |
1341 | /* stop flush processing */ |
1342 | goto finished; | |
1343 | } | |
1344 | break; | |
1345 | case DASD_CQR_QUEUED: | |
1da177e4 | 1346 | cqr->stopclk = get_clock(); |
8e09f215 | 1347 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1348 | break; |
8e09f215 | 1349 | default: /* no need to modify the others */ |
8f61701b HH |
1350 | break; |
1351 | } | |
8e09f215 | 1352 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1353 | } |
8f61701b HH |
1354 | finished: |
1355 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1356 | /* |
1357 | * After this point all requests must be in state CLEAR_PENDING, | |
1358 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1359 | * one of the others. | |
1360 | */ | |
1361 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1362 | wait_event(dasd_flush_wq, | |
1363 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1364 | /* | |
1365 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1366 | * and call the callback function of flushed requests | |
1367 | */ | |
1368 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1369 | return rc; |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | /* | |
1373 | * Acquire the device lock and process queues for the device. | |
1374 | */ | |
8e09f215 | 1375 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1376 | { |
1377 | struct list_head final_queue; | |
1da177e4 LT |
1378 | |
1379 | atomic_set (&device->tasklet_scheduled, 0); | |
1380 | INIT_LIST_HEAD(&final_queue); | |
1381 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1382 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1383 | __dasd_device_check_expire(device); |
1384 | /* find final requests on ccw queue */ | |
1385 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1386 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1387 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1388 | __dasd_device_process_final_queue(device, &final_queue); |
1389 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1390 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1391 | __dasd_device_start_head(device); |
1392 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1393 | dasd_put_device(device); |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1398 | */ | |
8e09f215 | 1399 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1400 | { |
1401 | /* Protect against rescheduling. */ | |
973bd993 | 1402 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1403 | return; |
1404 | dasd_get_device(device); | |
1405 | tasklet_hi_schedule(&device->tasklet); | |
1406 | } | |
1407 | ||
1408 | /* | |
8e09f215 SW |
1409 | * Queue a request to the head of the device ccw_queue. |
1410 | * Start the I/O if possible. | |
1da177e4 | 1411 | */ |
8e09f215 | 1412 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1413 | { |
1414 | struct dasd_device *device; | |
1415 | unsigned long flags; | |
1416 | ||
8e09f215 | 1417 | device = cqr->startdev; |
1da177e4 | 1418 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1419 | cqr->status = DASD_CQR_QUEUED; |
1420 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1421 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1422 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1423 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1424 | } | |
1425 | ||
1426 | /* | |
8e09f215 SW |
1427 | * Queue a request to the tail of the device ccw_queue. |
1428 | * Start the I/O if possible. | |
1da177e4 | 1429 | */ |
8e09f215 | 1430 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1431 | { |
1432 | struct dasd_device *device; | |
1433 | unsigned long flags; | |
1434 | ||
8e09f215 | 1435 | device = cqr->startdev; |
1da177e4 | 1436 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1437 | cqr->status = DASD_CQR_QUEUED; |
1438 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1439 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1440 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1441 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1442 | } | |
1443 | ||
1444 | /* | |
8e09f215 | 1445 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1446 | */ |
8e09f215 | 1447 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 LT |
1448 | { |
1449 | wake_up((wait_queue_head_t *) data); | |
1450 | } | |
1451 | ||
8e09f215 | 1452 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1453 | { |
1454 | struct dasd_device *device; | |
1455 | int rc; | |
1456 | ||
8e09f215 | 1457 | device = cqr->startdev; |
1da177e4 | 1458 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
c2ba444d | 1459 | rc = ((cqr->status == DASD_CQR_DONE || |
8e09f215 SW |
1460 | cqr->status == DASD_CQR_NEED_ERP || |
1461 | cqr->status == DASD_CQR_TERMINATED) && | |
1462 | list_empty(&cqr->devlist)); | |
1da177e4 LT |
1463 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1464 | return rc; | |
1465 | } | |
1466 | ||
1467 | /* | |
8e09f215 SW |
1468 | * Queue a request to the tail of the device ccw_queue and wait for |
1469 | * it's completion. | |
1da177e4 | 1470 | */ |
8e09f215 | 1471 | int dasd_sleep_on(struct dasd_ccw_req *cqr) |
1da177e4 | 1472 | { |
1da177e4 LT |
1473 | struct dasd_device *device; |
1474 | int rc; | |
138c014d | 1475 | |
8e09f215 | 1476 | device = cqr->startdev; |
138c014d | 1477 | |
1da177e4 | 1478 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1479 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1480 | dasd_add_request_tail(cqr); |
c80ee724 | 1481 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1482 | |
6cc7f168 SW |
1483 | if (cqr->status == DASD_CQR_DONE) |
1484 | rc = 0; | |
1485 | else if (cqr->intrc) | |
1486 | rc = cqr->intrc; | |
1487 | else | |
1488 | rc = -EIO; | |
1da177e4 LT |
1489 | return rc; |
1490 | } | |
1491 | ||
1492 | /* | |
8e09f215 SW |
1493 | * Queue a request to the tail of the device ccw_queue and wait |
1494 | * interruptible for it's completion. | |
1da177e4 | 1495 | */ |
8e09f215 | 1496 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1497 | { |
1da177e4 | 1498 | struct dasd_device *device; |
8e09f215 | 1499 | int rc; |
1da177e4 | 1500 | |
8e09f215 | 1501 | device = cqr->startdev; |
1da177e4 | 1502 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1503 | cqr->callback_data = (void *) &generic_waitq; |
8e09f215 | 1504 | dasd_add_request_tail(cqr); |
c80ee724 | 1505 | rc = wait_event_interruptible(generic_waitq, _wait_for_wakeup(cqr)); |
8e09f215 SW |
1506 | if (rc == -ERESTARTSYS) { |
1507 | dasd_cancel_req(cqr); | |
1508 | /* wait (non-interruptible) for final status */ | |
c80ee724 | 1509 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
6cc7f168 | 1510 | cqr->intrc = rc; |
1da177e4 | 1511 | } |
6cc7f168 SW |
1512 | |
1513 | if (cqr->status == DASD_CQR_DONE) | |
1514 | rc = 0; | |
1515 | else if (cqr->intrc) | |
1516 | rc = cqr->intrc; | |
1517 | else | |
1518 | rc = -EIO; | |
1da177e4 LT |
1519 | return rc; |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1524 | * for eckd devices) the currently running request has to be terminated | |
1525 | * and be put back to status queued, before the special request is added | |
1526 | * to the head of the queue. Then the special request is waited on normally. | |
1527 | */ | |
8e09f215 | 1528 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1529 | { |
1530 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1531 | |
1532 | if (list_empty(&device->ccw_queue)) | |
1533 | return 0; | |
8e09f215 | 1534 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1535 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1536 | } |
1537 | ||
8e09f215 | 1538 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1539 | { |
1da177e4 LT |
1540 | struct dasd_device *device; |
1541 | int rc; | |
138c014d | 1542 | |
8e09f215 | 1543 | device = cqr->startdev; |
1da177e4 LT |
1544 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1545 | rc = _dasd_term_running_cqr(device); | |
1546 | if (rc) { | |
1547 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1548 | return rc; | |
1549 | } | |
138c014d | 1550 | |
1da177e4 | 1551 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1552 | cqr->callback_data = (void *) &generic_waitq; |
1da177e4 | 1553 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1554 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1555 | |
1da177e4 | 1556 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1557 | dasd_schedule_device_bh(device); |
138c014d | 1558 | |
1da177e4 LT |
1559 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1560 | ||
c80ee724 | 1561 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1562 | |
6cc7f168 SW |
1563 | if (cqr->status == DASD_CQR_DONE) |
1564 | rc = 0; | |
1565 | else if (cqr->intrc) | |
1566 | rc = cqr->intrc; | |
1567 | else | |
1568 | rc = -EIO; | |
1da177e4 LT |
1569 | return rc; |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * Cancels a request that was started with dasd_sleep_on_req. | |
1574 | * This is useful to timeout requests. The request will be | |
1575 | * terminated if it is currently in i/o. | |
1576 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1577 | * 0 if there was no need to terminate the request (not started yet) |
1578 | * negative error code if termination failed | |
1579 | * Cancellation of a request is an asynchronous operation! The calling | |
1580 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1581 | */ |
8e09f215 | 1582 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1583 | { |
8e09f215 | 1584 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1585 | unsigned long flags; |
1586 | int rc; | |
1587 | ||
1588 | rc = 0; | |
1589 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1590 | switch (cqr->status) { | |
1591 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1592 | /* request was not started - just set to cleared */ |
1593 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1594 | break; |
1595 | case DASD_CQR_IN_IO: | |
1596 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1597 | rc = device->discipline->term_IO(cqr); |
1598 | if (rc) { | |
fc19f381 SH |
1599 | dev_err(&device->cdev->dev, |
1600 | "Cancelling request %p failed with rc=%d\n", | |
1601 | cqr, rc); | |
8e09f215 SW |
1602 | } else { |
1603 | cqr->stopclk = get_clock(); | |
1604 | rc = 1; | |
1605 | } | |
1da177e4 | 1606 | break; |
8e09f215 | 1607 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1608 | break; |
8e09f215 SW |
1609 | } |
1610 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1611 | dasd_schedule_device_bh(device); | |
1612 | return rc; | |
1613 | } | |
1614 | ||
1615 | ||
1616 | /* | |
1617 | * SECTION: Operations of the dasd_block layer. | |
1618 | */ | |
1619 | ||
1620 | /* | |
1621 | * Timeout function for dasd_block. This is used when the block layer | |
1622 | * is waiting for something that may not come reliably, (e.g. a state | |
1623 | * change interrupt) | |
1624 | */ | |
1625 | static void dasd_block_timeout(unsigned long ptr) | |
1626 | { | |
1627 | unsigned long flags; | |
1628 | struct dasd_block *block; | |
1629 | ||
1630 | block = (struct dasd_block *) ptr; | |
1631 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1632 | /* re-activate request queue */ | |
1633 | block->base->stopped &= ~DASD_STOPPED_PENDING; | |
1634 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); | |
1635 | dasd_schedule_block_bh(block); | |
1636 | } | |
1637 | ||
1638 | /* | |
1639 | * Setup timeout for a dasd_block in jiffies. | |
1640 | */ | |
1641 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1642 | { | |
48cae885 SW |
1643 | if (expires == 0) |
1644 | del_timer(&block->timer); | |
1645 | else | |
1646 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 SW |
1647 | } |
1648 | ||
1649 | /* | |
1650 | * Clear timeout for a dasd_block. | |
1651 | */ | |
1652 | void dasd_block_clear_timer(struct dasd_block *block) | |
1653 | { | |
48cae885 | 1654 | del_timer(&block->timer); |
8e09f215 SW |
1655 | } |
1656 | ||
8e09f215 SW |
1657 | /* |
1658 | * Process finished error recovery ccw. | |
1659 | */ | |
1660 | static inline void __dasd_block_process_erp(struct dasd_block *block, | |
1661 | struct dasd_ccw_req *cqr) | |
1662 | { | |
1663 | dasd_erp_fn_t erp_fn; | |
1664 | struct dasd_device *device = block->base; | |
1665 | ||
1666 | if (cqr->status == DASD_CQR_DONE) | |
1667 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1668 | else | |
fc19f381 | 1669 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
1670 | erp_fn = device->discipline->erp_postaction(cqr); |
1671 | erp_fn(cqr); | |
1672 | } | |
1da177e4 | 1673 | |
8e09f215 SW |
1674 | /* |
1675 | * Fetch requests from the block device queue. | |
1676 | */ | |
1677 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1678 | { | |
1679 | struct request_queue *queue; | |
1680 | struct request *req; | |
1681 | struct dasd_ccw_req *cqr; | |
1682 | struct dasd_device *basedev; | |
1683 | unsigned long flags; | |
1684 | queue = block->request_queue; | |
1685 | basedev = block->base; | |
1686 | /* No queue ? Then there is nothing to do. */ | |
1687 | if (queue == NULL) | |
1688 | return; | |
1689 | ||
1690 | /* | |
1691 | * We requeue request from the block device queue to the ccw | |
1692 | * queue only in two states. In state DASD_STATE_READY the | |
1693 | * partition detection is done and we need to requeue requests | |
1694 | * for that. State DASD_STATE_ONLINE is normal block device | |
1695 | * operation. | |
1696 | */ | |
97f604b0 SW |
1697 | if (basedev->state < DASD_STATE_READY) { |
1698 | while ((req = blk_fetch_request(block->request_queue))) | |
1699 | __blk_end_request_all(req, -EIO); | |
8e09f215 | 1700 | return; |
97f604b0 | 1701 | } |
8e09f215 | 1702 | /* Now we try to fetch requests from the request queue */ |
9934c8c0 | 1703 | while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) { |
8e09f215 SW |
1704 | if (basedev->features & DASD_FEATURE_READONLY && |
1705 | rq_data_dir(req) == WRITE) { | |
1706 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1707 | "Rejecting write request %p", | |
1708 | req); | |
9934c8c0 | 1709 | blk_start_request(req); |
40cbbb78 | 1710 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1711 | continue; |
1712 | } | |
1713 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1714 | if (IS_ERR(cqr)) { | |
1715 | if (PTR_ERR(cqr) == -EBUSY) | |
1716 | break; /* normal end condition */ | |
1717 | if (PTR_ERR(cqr) == -ENOMEM) | |
1718 | break; /* terminate request queue loop */ | |
1719 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1720 | /* | |
1721 | * The current request cannot be build right | |
1722 | * now, we have to try later. If this request | |
1723 | * is the head-of-queue we stop the device | |
1724 | * for 1/2 second. | |
1725 | */ | |
1726 | if (!list_empty(&block->ccw_queue)) | |
1727 | break; | |
1728 | spin_lock_irqsave(get_ccwdev_lock(basedev->cdev), flags); | |
1729 | basedev->stopped |= DASD_STOPPED_PENDING; | |
1730 | spin_unlock_irqrestore(get_ccwdev_lock(basedev->cdev), flags); | |
1731 | dasd_block_set_timer(block, HZ/2); | |
1732 | break; | |
1733 | } | |
1734 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1735 | "CCW creation failed (rc=%ld) " | |
1736 | "on request %p", | |
1737 | PTR_ERR(cqr), req); | |
9934c8c0 | 1738 | blk_start_request(req); |
40cbbb78 | 1739 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1740 | continue; |
1741 | } | |
1742 | /* | |
1743 | * Note: callback is set to dasd_return_cqr_cb in | |
1744 | * __dasd_block_start_head to cover erp requests as well | |
1745 | */ | |
1746 | cqr->callback_data = (void *) req; | |
1747 | cqr->status = DASD_CQR_FILLED; | |
9934c8c0 | 1748 | blk_start_request(req); |
8e09f215 SW |
1749 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
1750 | dasd_profile_start(block, cqr, req); | |
1751 | } | |
1752 | } | |
1753 | ||
1754 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1755 | { | |
1756 | struct request *req; | |
1757 | int status; | |
4c4e2148 | 1758 | int error = 0; |
8e09f215 SW |
1759 | |
1760 | req = (struct request *) cqr->callback_data; | |
1761 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1762 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1763 | if (status <= 0) |
1764 | error = status ? status : -EIO; | |
40cbbb78 | 1765 | __blk_end_request_all(req, error); |
8e09f215 SW |
1766 | } |
1767 | ||
1768 | /* | |
1769 | * Process ccw request queue. | |
1770 | */ | |
1771 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1772 | struct list_head *final_queue) | |
1773 | { | |
1774 | struct list_head *l, *n; | |
1775 | struct dasd_ccw_req *cqr; | |
1776 | dasd_erp_fn_t erp_fn; | |
1777 | unsigned long flags; | |
1778 | struct dasd_device *base = block->base; | |
1779 | ||
1780 | restart: | |
1781 | /* Process request with final status. */ | |
1782 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1783 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1784 | if (cqr->status != DASD_CQR_DONE && | |
1785 | cqr->status != DASD_CQR_FAILED && | |
1786 | cqr->status != DASD_CQR_NEED_ERP && | |
1787 | cqr->status != DASD_CQR_TERMINATED) | |
1788 | continue; | |
1789 | ||
1790 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1791 | base->discipline->handle_terminated_request(cqr); | |
1792 | goto restart; | |
1793 | } | |
1794 | ||
1795 | /* Process requests that may be recovered */ | |
1796 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 SH |
1797 | erp_fn = base->discipline->erp_action(cqr); |
1798 | erp_fn(cqr); | |
8e09f215 SW |
1799 | goto restart; |
1800 | } | |
1801 | ||
a9cffb22 SH |
1802 | /* log sense for fatal error */ |
1803 | if (cqr->status == DASD_CQR_FAILED) { | |
1804 | dasd_log_sense(cqr, &cqr->irb); | |
1805 | } | |
1806 | ||
8e09f215 SW |
1807 | /* First of all call extended error reporting. */ |
1808 | if (dasd_eer_enabled(base) && | |
1809 | cqr->status == DASD_CQR_FAILED) { | |
1810 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1811 | ||
1812 | /* restart request */ | |
1813 | cqr->status = DASD_CQR_FILLED; | |
1814 | cqr->retries = 255; | |
1815 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
1816 | base->stopped |= DASD_STOPPED_QUIESCE; | |
1817 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), | |
1818 | flags); | |
1819 | goto restart; | |
1820 | } | |
1821 | ||
1822 | /* Process finished ERP request. */ | |
1823 | if (cqr->refers) { | |
1824 | __dasd_block_process_erp(block, cqr); | |
1825 | goto restart; | |
1826 | } | |
1827 | ||
1828 | /* Rechain finished requests to final queue */ | |
1829 | cqr->endclk = get_clock(); | |
1830 | list_move_tail(&cqr->blocklist, final_queue); | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1835 | { | |
1836 | dasd_schedule_block_bh(cqr->block); | |
1837 | } | |
1838 | ||
1839 | static void __dasd_block_start_head(struct dasd_block *block) | |
1840 | { | |
1841 | struct dasd_ccw_req *cqr; | |
1842 | ||
1843 | if (list_empty(&block->ccw_queue)) | |
1844 | return; | |
1845 | /* We allways begin with the first requests on the queue, as some | |
1846 | * of previously started requests have to be enqueued on a | |
1847 | * dasd_device again for error recovery. | |
1848 | */ | |
1849 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1850 | if (cqr->status != DASD_CQR_FILLED) | |
1851 | continue; | |
1852 | /* Non-temporary stop condition will trigger fail fast */ | |
1853 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1854 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1855 | (!dasd_eer_enabled(block->base))) { | |
1856 | cqr->status = DASD_CQR_FAILED; | |
1857 | dasd_schedule_block_bh(block); | |
1858 | continue; | |
1859 | } | |
1860 | /* Don't try to start requests if device is stopped */ | |
1861 | if (block->base->stopped) | |
1862 | return; | |
1863 | ||
1864 | /* just a fail safe check, should not happen */ | |
1865 | if (!cqr->startdev) | |
1866 | cqr->startdev = block->base; | |
1867 | ||
1868 | /* make sure that the requests we submit find their way back */ | |
1869 | cqr->callback = dasd_return_cqr_cb; | |
1870 | ||
1871 | dasd_add_request_tail(cqr); | |
1872 | } | |
1873 | } | |
1874 | ||
1875 | /* | |
1876 | * Central dasd_block layer routine. Takes requests from the generic | |
1877 | * block layer request queue, creates ccw requests, enqueues them on | |
1878 | * a dasd_device and processes ccw requests that have been returned. | |
1879 | */ | |
1880 | static void dasd_block_tasklet(struct dasd_block *block) | |
1881 | { | |
1882 | struct list_head final_queue; | |
1883 | struct list_head *l, *n; | |
1884 | struct dasd_ccw_req *cqr; | |
1885 | ||
1886 | atomic_set(&block->tasklet_scheduled, 0); | |
1887 | INIT_LIST_HEAD(&final_queue); | |
1888 | spin_lock(&block->queue_lock); | |
1889 | /* Finish off requests on ccw queue */ | |
1890 | __dasd_process_block_ccw_queue(block, &final_queue); | |
1891 | spin_unlock(&block->queue_lock); | |
1892 | /* Now call the callback function of requests with final status */ | |
1893 | spin_lock_irq(&block->request_queue_lock); | |
1894 | list_for_each_safe(l, n, &final_queue) { | |
1895 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1896 | list_del_init(&cqr->blocklist); | |
1897 | __dasd_cleanup_cqr(cqr); | |
1898 | } | |
1899 | spin_lock(&block->queue_lock); | |
1900 | /* Get new request from the block device request queue */ | |
1901 | __dasd_process_request_queue(block); | |
1902 | /* Now check if the head of the ccw queue needs to be started. */ | |
1903 | __dasd_block_start_head(block); | |
1904 | spin_unlock(&block->queue_lock); | |
1905 | spin_unlock_irq(&block->request_queue_lock); | |
1906 | dasd_put_device(block->base); | |
1907 | } | |
1908 | ||
1909 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
1910 | { | |
1911 | wake_up(&dasd_flush_wq); | |
1912 | } | |
1913 | ||
1914 | /* | |
1915 | * Go through all request on the dasd_block request queue, cancel them | |
1916 | * on the respective dasd_device, and return them to the generic | |
1917 | * block layer. | |
1918 | */ | |
1919 | static int dasd_flush_block_queue(struct dasd_block *block) | |
1920 | { | |
1921 | struct dasd_ccw_req *cqr, *n; | |
1922 | int rc, i; | |
1923 | struct list_head flush_queue; | |
1924 | ||
1925 | INIT_LIST_HEAD(&flush_queue); | |
1926 | spin_lock_bh(&block->queue_lock); | |
1927 | rc = 0; | |
1928 | restart: | |
1929 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
1930 | /* if this request currently owned by a dasd_device cancel it */ | |
1931 | if (cqr->status >= DASD_CQR_QUEUED) | |
1932 | rc = dasd_cancel_req(cqr); | |
1933 | if (rc < 0) | |
1934 | break; | |
1935 | /* Rechain request (including erp chain) so it won't be | |
1936 | * touched by the dasd_block_tasklet anymore. | |
1937 | * Replace the callback so we notice when the request | |
1938 | * is returned from the dasd_device layer. | |
1939 | */ | |
1940 | cqr->callback = _dasd_wake_block_flush_cb; | |
1941 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
1942 | list_move_tail(&cqr->blocklist, &flush_queue); | |
1943 | if (i > 1) | |
1944 | /* moved more than one request - need to restart */ | |
1945 | goto restart; | |
1946 | } | |
1947 | spin_unlock_bh(&block->queue_lock); | |
1948 | /* Now call the callback function of flushed requests */ | |
1949 | restart_cb: | |
1950 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
1951 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
1952 | /* Process finished ERP request. */ | |
1953 | if (cqr->refers) { | |
0cd4bd47 | 1954 | spin_lock_bh(&block->queue_lock); |
8e09f215 | 1955 | __dasd_block_process_erp(block, cqr); |
0cd4bd47 | 1956 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
1957 | /* restart list_for_xx loop since dasd_process_erp |
1958 | * might remove multiple elements */ | |
1959 | goto restart_cb; | |
1960 | } | |
1961 | /* call the callback function */ | |
0cd4bd47 | 1962 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
1963 | cqr->endclk = get_clock(); |
1964 | list_del_init(&cqr->blocklist); | |
1965 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 1966 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 1967 | } |
1da177e4 LT |
1968 | return rc; |
1969 | } | |
1970 | ||
1971 | /* | |
8e09f215 SW |
1972 | * Schedules a call to dasd_tasklet over the device tasklet. |
1973 | */ | |
1974 | void dasd_schedule_block_bh(struct dasd_block *block) | |
1975 | { | |
1976 | /* Protect against rescheduling. */ | |
1977 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
1978 | return; | |
1979 | /* life cycle of block is bound to it's base device */ | |
1980 | dasd_get_device(block->base); | |
1981 | tasklet_hi_schedule(&block->tasklet); | |
1982 | } | |
1983 | ||
1984 | ||
1985 | /* | |
1986 | * SECTION: external block device operations | |
1987 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
1988 | */ |
1989 | ||
1990 | /* | |
1991 | * Dasd request queue function. Called from ll_rw_blk.c | |
1992 | */ | |
8e09f215 | 1993 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 1994 | { |
8e09f215 | 1995 | struct dasd_block *block; |
1da177e4 | 1996 | |
8e09f215 SW |
1997 | block = queue->queuedata; |
1998 | spin_lock(&block->queue_lock); | |
1da177e4 | 1999 | /* Get new request from the block device request queue */ |
8e09f215 | 2000 | __dasd_process_request_queue(block); |
1da177e4 | 2001 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2002 | __dasd_block_start_head(block); |
2003 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
2004 | } |
2005 | ||
2006 | /* | |
2007 | * Allocate and initialize request queue and default I/O scheduler. | |
2008 | */ | |
8e09f215 | 2009 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
2010 | { |
2011 | int rc; | |
2012 | ||
8e09f215 SW |
2013 | block->request_queue = blk_init_queue(do_dasd_request, |
2014 | &block->request_queue_lock); | |
2015 | if (block->request_queue == NULL) | |
1da177e4 LT |
2016 | return -ENOMEM; |
2017 | ||
8e09f215 | 2018 | block->request_queue->queuedata = block; |
1da177e4 | 2019 | |
8e09f215 | 2020 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 2021 | block->request_queue->elevator = NULL; |
8e09f215 | 2022 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 2023 | if (rc) { |
8e09f215 | 2024 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
2025 | return rc; |
2026 | } | |
2027 | return 0; | |
2028 | } | |
2029 | ||
2030 | /* | |
2031 | * Allocate and initialize request queue. | |
2032 | */ | |
8e09f215 | 2033 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
2034 | { |
2035 | int max; | |
2036 | ||
e1defc4f | 2037 | blk_queue_logical_block_size(block->request_queue, block->bp_block); |
8e09f215 SW |
2038 | max = block->base->discipline->max_blocks << block->s2b_shift; |
2039 | blk_queue_max_sectors(block->request_queue, max); | |
2040 | blk_queue_max_phys_segments(block->request_queue, -1L); | |
2041 | blk_queue_max_hw_segments(block->request_queue, -1L); | |
f3eb5384 SW |
2042 | /* with page sized segments we can translate each segement into |
2043 | * one idaw/tidaw | |
2044 | */ | |
2045 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
2046 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
8e09f215 | 2047 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); |
1da177e4 LT |
2048 | } |
2049 | ||
2050 | /* | |
2051 | * Deactivate and free request queue. | |
2052 | */ | |
8e09f215 | 2053 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2054 | { |
8e09f215 SW |
2055 | if (block->request_queue) { |
2056 | blk_cleanup_queue(block->request_queue); | |
2057 | block->request_queue = NULL; | |
1da177e4 LT |
2058 | } |
2059 | } | |
2060 | ||
2061 | /* | |
2062 | * Flush request on the request queue. | |
2063 | */ | |
8e09f215 | 2064 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2065 | { |
2066 | struct request *req; | |
2067 | ||
8e09f215 | 2068 | if (!block->request_queue) |
1da177e4 | 2069 | return; |
138c014d | 2070 | |
8e09f215 | 2071 | spin_lock_irq(&block->request_queue_lock); |
9934c8c0 | 2072 | while ((req = blk_fetch_request(block->request_queue))) |
40cbbb78 | 2073 | __blk_end_request_all(req, -EIO); |
8e09f215 | 2074 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2075 | } |
2076 | ||
57a7c0bc | 2077 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2078 | { |
57a7c0bc | 2079 | struct dasd_block *block = bdev->bd_disk->private_data; |
8e09f215 | 2080 | struct dasd_device *base = block->base; |
1da177e4 LT |
2081 | int rc; |
2082 | ||
8e09f215 SW |
2083 | atomic_inc(&block->open_count); |
2084 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2085 | rc = -ENODEV; |
2086 | goto unlock; | |
2087 | } | |
2088 | ||
8e09f215 | 2089 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2090 | rc = -EINVAL; |
2091 | goto unlock; | |
2092 | } | |
2093 | ||
2094 | if (dasd_probeonly) { | |
fc19f381 SH |
2095 | dev_info(&base->cdev->dev, |
2096 | "Accessing the DASD failed because it is in " | |
2097 | "probeonly mode\n"); | |
1da177e4 LT |
2098 | rc = -EPERM; |
2099 | goto out; | |
2100 | } | |
2101 | ||
8e09f215 SW |
2102 | if (base->state <= DASD_STATE_BASIC) { |
2103 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2104 | " Cannot open unrecognized device"); |
2105 | rc = -ENODEV; | |
2106 | goto out; | |
2107 | } | |
2108 | ||
2109 | return 0; | |
2110 | ||
2111 | out: | |
8e09f215 | 2112 | module_put(base->discipline->owner); |
1da177e4 | 2113 | unlock: |
8e09f215 | 2114 | atomic_dec(&block->open_count); |
1da177e4 LT |
2115 | return rc; |
2116 | } | |
2117 | ||
57a7c0bc | 2118 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2119 | { |
8e09f215 | 2120 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2121 | |
8e09f215 SW |
2122 | atomic_dec(&block->open_count); |
2123 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2124 | return 0; |
2125 | } | |
2126 | ||
a885c8c4 CH |
2127 | /* |
2128 | * Return disk geometry. | |
2129 | */ | |
8e09f215 | 2130 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2131 | { |
8e09f215 SW |
2132 | struct dasd_block *block; |
2133 | struct dasd_device *base; | |
a885c8c4 | 2134 | |
8e09f215 | 2135 | block = bdev->bd_disk->private_data; |
8e09f215 | 2136 | if (!block) |
a885c8c4 | 2137 | return -ENODEV; |
cf05b824 | 2138 | base = block->base; |
a885c8c4 | 2139 | |
8e09f215 SW |
2140 | if (!base->discipline || |
2141 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2142 | return -EINVAL; |
2143 | ||
8e09f215 SW |
2144 | base->discipline->fill_geometry(block, geo); |
2145 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2146 | return 0; |
2147 | } | |
2148 | ||
83d5cde4 | 2149 | const struct block_device_operations |
1da177e4 LT |
2150 | dasd_device_operations = { |
2151 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2152 | .open = dasd_open, |
2153 | .release = dasd_release, | |
0000d031 HC |
2154 | .ioctl = dasd_ioctl, |
2155 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 2156 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2157 | }; |
2158 | ||
8e09f215 SW |
2159 | /******************************************************************************* |
2160 | * end of block device operations | |
2161 | */ | |
1da177e4 LT |
2162 | |
2163 | static void | |
2164 | dasd_exit(void) | |
2165 | { | |
2166 | #ifdef CONFIG_PROC_FS | |
2167 | dasd_proc_exit(); | |
2168 | #endif | |
20c64468 | 2169 | dasd_eer_exit(); |
6bb0e010 HH |
2170 | if (dasd_page_cache != NULL) { |
2171 | kmem_cache_destroy(dasd_page_cache); | |
2172 | dasd_page_cache = NULL; | |
2173 | } | |
1da177e4 LT |
2174 | dasd_gendisk_exit(); |
2175 | dasd_devmap_exit(); | |
1da177e4 LT |
2176 | if (dasd_debug_area != NULL) { |
2177 | debug_unregister(dasd_debug_area); | |
2178 | dasd_debug_area = NULL; | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | /* | |
2183 | * SECTION: common functions for ccw_driver use | |
2184 | */ | |
2185 | ||
f3445a1a CH |
2186 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
2187 | { | |
2188 | struct ccw_device *cdev = data; | |
2189 | int ret; | |
2190 | ||
2191 | ret = ccw_device_set_online(cdev); | |
2192 | if (ret) | |
2193 | pr_warning("%s: Setting the DASD online failed with rc=%d\n", | |
2194 | dev_name(&cdev->dev), ret); | |
2195 | else { | |
2196 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2197 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2198 | dasd_put_device(device); | |
2199 | } | |
2200 | } | |
2201 | ||
1c01b8a5 HH |
2202 | /* |
2203 | * Initial attempt at a probe function. this can be simplified once | |
2204 | * the other detection code is gone. | |
2205 | */ | |
8e09f215 SW |
2206 | int dasd_generic_probe(struct ccw_device *cdev, |
2207 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2208 | { |
2209 | int ret; | |
2210 | ||
40545573 HH |
2211 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
2212 | if (ret) { | |
fc19f381 | 2213 | DBF_EVENT(DBF_WARNING, |
40545573 | 2214 | "dasd_generic_probe: could not set ccw-device options " |
2a0217d5 | 2215 | "for %s\n", dev_name(&cdev->dev)); |
40545573 HH |
2216 | return ret; |
2217 | } | |
1da177e4 LT |
2218 | ret = dasd_add_sysfs_files(cdev); |
2219 | if (ret) { | |
fc19f381 | 2220 | DBF_EVENT(DBF_WARNING, |
1da177e4 | 2221 | "dasd_generic_probe: could not add sysfs entries " |
2a0217d5 | 2222 | "for %s\n", dev_name(&cdev->dev)); |
40545573 | 2223 | return ret; |
1da177e4 | 2224 | } |
40545573 | 2225 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2226 | |
40545573 HH |
2227 | /* |
2228 | * Automatically online either all dasd devices (dasd_autodetect) | |
2229 | * or all devices specified with dasd= parameters during | |
2230 | * initial probe. | |
2231 | */ | |
2232 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2233 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 2234 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 2235 | return 0; |
1da177e4 LT |
2236 | } |
2237 | ||
1c01b8a5 HH |
2238 | /* |
2239 | * This will one day be called from a global not_oper handler. | |
2240 | * It is also used by driver_unregister during module unload. | |
2241 | */ | |
8e09f215 | 2242 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2243 | { |
2244 | struct dasd_device *device; | |
8e09f215 | 2245 | struct dasd_block *block; |
1da177e4 | 2246 | |
59afda78 HH |
2247 | cdev->handler = NULL; |
2248 | ||
1da177e4 LT |
2249 | dasd_remove_sysfs_files(cdev); |
2250 | device = dasd_device_from_cdev(cdev); | |
2251 | if (IS_ERR(device)) | |
2252 | return; | |
2253 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2254 | /* Already doing offline processing */ | |
2255 | dasd_put_device(device); | |
2256 | return; | |
2257 | } | |
2258 | /* | |
2259 | * This device is removed unconditionally. Set offline | |
2260 | * flag to prevent dasd_open from opening it while it is | |
2261 | * no quite down yet. | |
2262 | */ | |
2263 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2264 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2265 | block = device->block; |
2266 | device->block = NULL; | |
1da177e4 | 2267 | dasd_delete_device(device); |
8e09f215 SW |
2268 | /* |
2269 | * life cycle of block is bound to device, so delete it after | |
2270 | * device was safely removed | |
2271 | */ | |
2272 | if (block) | |
2273 | dasd_free_block(block); | |
1da177e4 LT |
2274 | } |
2275 | ||
1c01b8a5 HH |
2276 | /* |
2277 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2278 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2279 | * or the user has started activation through sysfs. |
2280 | */ | |
8e09f215 SW |
2281 | int dasd_generic_set_online(struct ccw_device *cdev, |
2282 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2283 | { |
aa88861f | 2284 | struct dasd_discipline *discipline; |
1da177e4 | 2285 | struct dasd_device *device; |
c6eb7b77 | 2286 | int rc; |
f24acd45 | 2287 | |
40545573 HH |
2288 | /* first online clears initial online feature flag */ |
2289 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2290 | device = dasd_create_device(cdev); |
2291 | if (IS_ERR(device)) | |
2292 | return PTR_ERR(device); | |
2293 | ||
aa88861f | 2294 | discipline = base_discipline; |
c6eb7b77 | 2295 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 2296 | if (!dasd_diag_discipline_pointer) { |
fc19f381 SH |
2297 | pr_warning("%s Setting the DASD online failed because " |
2298 | "of missing DIAG discipline\n", | |
2299 | dev_name(&cdev->dev)); | |
1da177e4 LT |
2300 | dasd_delete_device(device); |
2301 | return -ENODEV; | |
2302 | } | |
2303 | discipline = dasd_diag_discipline_pointer; | |
2304 | } | |
aa88861f PO |
2305 | if (!try_module_get(base_discipline->owner)) { |
2306 | dasd_delete_device(device); | |
2307 | return -EINVAL; | |
2308 | } | |
2309 | if (!try_module_get(discipline->owner)) { | |
2310 | module_put(base_discipline->owner); | |
2311 | dasd_delete_device(device); | |
2312 | return -EINVAL; | |
2313 | } | |
2314 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2315 | device->discipline = discipline; |
2316 | ||
8e09f215 | 2317 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2318 | rc = discipline->check_device(device); |
2319 | if (rc) { | |
fc19f381 SH |
2320 | pr_warning("%s Setting the DASD online with discipline %s " |
2321 | "failed with rc=%i\n", | |
2322 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
2323 | module_put(discipline->owner); |
2324 | module_put(base_discipline->owner); | |
1da177e4 LT |
2325 | dasd_delete_device(device); |
2326 | return rc; | |
2327 | } | |
2328 | ||
2329 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2330 | if (device->state <= DASD_STATE_KNOWN) { | |
fc19f381 SH |
2331 | pr_warning("%s Setting the DASD online failed because of a " |
2332 | "missing discipline\n", dev_name(&cdev->dev)); | |
1da177e4 LT |
2333 | rc = -ENODEV; |
2334 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2335 | if (device->block) |
2336 | dasd_free_block(device->block); | |
1da177e4 LT |
2337 | dasd_delete_device(device); |
2338 | } else | |
2339 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2340 | dev_name(&cdev->dev)); |
1da177e4 | 2341 | dasd_put_device(device); |
1da177e4 LT |
2342 | return rc; |
2343 | } | |
2344 | ||
8e09f215 | 2345 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2346 | { |
2347 | struct dasd_device *device; | |
8e09f215 | 2348 | struct dasd_block *block; |
dafd87aa | 2349 | int max_count, open_count; |
1da177e4 LT |
2350 | |
2351 | device = dasd_device_from_cdev(cdev); | |
2352 | if (IS_ERR(device)) | |
2353 | return PTR_ERR(device); | |
2354 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2355 | /* Already doing offline processing */ | |
2356 | dasd_put_device(device); | |
2357 | return 0; | |
2358 | } | |
2359 | /* | |
2360 | * We must make sure that this device is currently not in use. | |
2361 | * The open_count is increased for every opener, that includes | |
2362 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2363 | * in the other openers. | |
2364 | */ | |
8e09f215 | 2365 | if (device->block) { |
a806170e HC |
2366 | max_count = device->block->bdev ? 0 : -1; |
2367 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2368 | if (open_count > max_count) { |
2369 | if (open_count > 0) | |
fc19f381 SH |
2370 | pr_warning("%s: The DASD cannot be set offline " |
2371 | "with open count %i\n", | |
2372 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 2373 | else |
fc19f381 SH |
2374 | pr_warning("%s: The DASD cannot be set offline " |
2375 | "while it is in use\n", | |
2376 | dev_name(&cdev->dev)); | |
8e09f215 SW |
2377 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2378 | dasd_put_device(device); | |
2379 | return -EBUSY; | |
2380 | } | |
1da177e4 LT |
2381 | } |
2382 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2383 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2384 | block = device->block; |
2385 | device->block = NULL; | |
1da177e4 | 2386 | dasd_delete_device(device); |
8e09f215 SW |
2387 | /* |
2388 | * life cycle of block is bound to device, so delete it after | |
2389 | * device was safely removed | |
2390 | */ | |
2391 | if (block) | |
2392 | dasd_free_block(block); | |
1da177e4 LT |
2393 | return 0; |
2394 | } | |
2395 | ||
8e09f215 | 2396 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2397 | { |
2398 | struct dasd_device *device; | |
2399 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
2400 | int ret; |
2401 | ||
91c36919 | 2402 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2403 | if (IS_ERR(device)) |
2404 | return 0; | |
1da177e4 LT |
2405 | ret = 0; |
2406 | switch (event) { | |
2407 | case CIO_GONE: | |
47593bfa | 2408 | case CIO_BOXED: |
1da177e4 | 2409 | case CIO_NO_PATH: |
20c64468 SW |
2410 | /* First of all call extended error reporting. */ |
2411 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2412 | ||
1da177e4 LT |
2413 | if (device->state < DASD_STATE_BASIC) |
2414 | break; | |
2415 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2416 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2417 | if (cqr->status == DASD_CQR_IN_IO) { | |
2418 | cqr->status = DASD_CQR_QUEUED; | |
2419 | cqr->retries++; | |
2420 | } | |
2421 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2422 | dasd_device_clear_timer(device); | |
2423 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2424 | ret = 1; |
2425 | break; | |
2426 | case CIO_OPER: | |
2427 | /* FIXME: add a sanity check. */ | |
8e09f215 | 2428 | device->stopped &= ~DASD_STOPPED_DC_WAIT; |
d41dd122 SH |
2429 | if (device->stopped & DASD_UNRESUMED_PM) { |
2430 | device->stopped &= ~DASD_UNRESUMED_PM; | |
2431 | dasd_restore_device(device); | |
2432 | ret = 1; | |
2433 | break; | |
2434 | } | |
8e09f215 SW |
2435 | dasd_schedule_device_bh(device); |
2436 | if (device->block) | |
2437 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2438 | ret = 1; |
2439 | break; | |
2440 | } | |
1da177e4 LT |
2441 | dasd_put_device(device); |
2442 | return ret; | |
2443 | } | |
2444 | ||
d41dd122 SH |
2445 | int dasd_generic_pm_freeze(struct ccw_device *cdev) |
2446 | { | |
2447 | struct dasd_ccw_req *cqr, *n; | |
2448 | int rc; | |
2449 | struct list_head freeze_queue; | |
2450 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2451 | ||
2452 | if (IS_ERR(device)) | |
2453 | return PTR_ERR(device); | |
2454 | /* disallow new I/O */ | |
2455 | device->stopped |= DASD_STOPPED_PM; | |
2456 | /* clear active requests */ | |
2457 | INIT_LIST_HEAD(&freeze_queue); | |
2458 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2459 | rc = 0; | |
2460 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { | |
2461 | /* Check status and move request to flush_queue */ | |
2462 | if (cqr->status == DASD_CQR_IN_IO) { | |
2463 | rc = device->discipline->term_IO(cqr); | |
2464 | if (rc) { | |
2465 | /* unable to terminate requeust */ | |
2466 | dev_err(&device->cdev->dev, | |
2467 | "Unable to terminate request %p " | |
2468 | "on suspend\n", cqr); | |
2469 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2470 | dasd_put_device(device); | |
2471 | return rc; | |
2472 | } | |
2473 | } | |
2474 | list_move_tail(&cqr->devlist, &freeze_queue); | |
2475 | } | |
2476 | ||
2477 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2478 | ||
2479 | list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { | |
2480 | wait_event(dasd_flush_wq, | |
2481 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
2482 | if (cqr->status == DASD_CQR_CLEARED) | |
2483 | cqr->status = DASD_CQR_QUEUED; | |
2484 | } | |
2485 | /* move freeze_queue to start of the ccw_queue */ | |
2486 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2487 | list_splice_tail(&freeze_queue, &device->ccw_queue); | |
2488 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2489 | ||
2490 | if (device->discipline->freeze) | |
2491 | rc = device->discipline->freeze(device); | |
2492 | ||
2493 | dasd_put_device(device); | |
2494 | return rc; | |
2495 | } | |
2496 | EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); | |
2497 | ||
2498 | int dasd_generic_restore_device(struct ccw_device *cdev) | |
2499 | { | |
2500 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2501 | int rc = 0; | |
2502 | ||
2503 | if (IS_ERR(device)) | |
2504 | return PTR_ERR(device); | |
2505 | ||
e6125fba SH |
2506 | /* allow new IO again */ |
2507 | device->stopped &= ~DASD_STOPPED_PM; | |
2508 | device->stopped &= ~DASD_UNRESUMED_PM; | |
2509 | ||
d41dd122 SH |
2510 | dasd_schedule_device_bh(device); |
2511 | if (device->block) | |
2512 | dasd_schedule_block_bh(device->block); | |
2513 | ||
2514 | if (device->discipline->restore) | |
2515 | rc = device->discipline->restore(device); | |
e6125fba SH |
2516 | if (rc) |
2517 | /* | |
2518 | * if the resume failed for the DASD we put it in | |
2519 | * an UNRESUMED stop state | |
2520 | */ | |
2521 | device->stopped |= DASD_UNRESUMED_PM; | |
d41dd122 SH |
2522 | |
2523 | dasd_put_device(device); | |
e6125fba | 2524 | return 0; |
d41dd122 SH |
2525 | } |
2526 | EXPORT_SYMBOL_GPL(dasd_generic_restore_device); | |
2527 | ||
763968e2 HC |
2528 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2529 | void *rdc_buffer, | |
2530 | int rdc_buffer_size, | |
68b781fe | 2531 | int magic) |
17283b56 CH |
2532 | { |
2533 | struct dasd_ccw_req *cqr; | |
2534 | struct ccw1 *ccw; | |
2535 | ||
2536 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2537 | ||
2538 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
2539 | /* internal error 13 - Allocating the RDC request failed*/ |
2540 | dev_err(&device->cdev->dev, | |
2541 | "An error occurred in the DASD device driver, " | |
2542 | "reason=%s\n", "13"); | |
17283b56 CH |
2543 | return cqr; |
2544 | } | |
2545 | ||
2546 | ccw = cqr->cpaddr; | |
2547 | ccw->cmd_code = CCW_CMD_RDC; | |
2548 | ccw->cda = (__u32)(addr_t)rdc_buffer; | |
2549 | ccw->count = rdc_buffer_size; | |
2550 | ||
8e09f215 SW |
2551 | cqr->startdev = device; |
2552 | cqr->memdev = device; | |
17283b56 CH |
2553 | cqr->expires = 10*HZ; |
2554 | clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
2555 | cqr->retries = 2; | |
2556 | cqr->buildclk = get_clock(); | |
2557 | cqr->status = DASD_CQR_FILLED; | |
2558 | return cqr; | |
2559 | } | |
2560 | ||
2561 | ||
68b781fe | 2562 | int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
92636b15 | 2563 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
2564 | { |
2565 | int ret; | |
2566 | struct dasd_ccw_req *cqr; | |
2567 | ||
92636b15 | 2568 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
2569 | magic); |
2570 | if (IS_ERR(cqr)) | |
2571 | return PTR_ERR(cqr); | |
2572 | ||
2573 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2574 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2575 | return ret; |
2576 | } | |
aaff0f64 | 2577 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2578 | |
f3eb5384 SW |
2579 | /* |
2580 | * In command mode and transport mode we need to look for sense | |
2581 | * data in different places. The sense data itself is allways | |
2582 | * an array of 32 bytes, so we can unify the sense data access | |
2583 | * for both modes. | |
2584 | */ | |
2585 | char *dasd_get_sense(struct irb *irb) | |
2586 | { | |
2587 | struct tsb *tsb = NULL; | |
2588 | char *sense = NULL; | |
2589 | ||
2590 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
2591 | if (irb->scsw.tm.tcw) | |
2592 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
2593 | irb->scsw.tm.tcw); | |
2594 | if (tsb && tsb->length == 64 && tsb->flags) | |
2595 | switch (tsb->flags & 0x07) { | |
2596 | case 1: /* tsa_iostat */ | |
2597 | sense = tsb->tsa.iostat.sense; | |
2598 | break; | |
2599 | case 2: /* tsa_ddpc */ | |
2600 | sense = tsb->tsa.ddpc.sense; | |
2601 | break; | |
2602 | default: | |
2603 | /* currently we don't use interrogate data */ | |
2604 | break; | |
2605 | } | |
2606 | } else if (irb->esw.esw0.erw.cons) { | |
2607 | sense = irb->ecw; | |
2608 | } | |
2609 | return sense; | |
2610 | } | |
2611 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
2612 | ||
8e09f215 | 2613 | static int __init dasd_init(void) |
1da177e4 LT |
2614 | { |
2615 | int rc; | |
2616 | ||
2617 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2618 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2619 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2620 | |
2621 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2622 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2623 | if (dasd_debug_area == NULL) { |
2624 | rc = -ENOMEM; | |
2625 | goto failed; | |
2626 | } | |
2627 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2628 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2629 | |
2630 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2631 | ||
2632 | dasd_diag_discipline_pointer = NULL; | |
2633 | ||
1da177e4 LT |
2634 | rc = dasd_devmap_init(); |
2635 | if (rc) | |
2636 | goto failed; | |
2637 | rc = dasd_gendisk_init(); | |
2638 | if (rc) | |
2639 | goto failed; | |
2640 | rc = dasd_parse(); | |
2641 | if (rc) | |
2642 | goto failed; | |
20c64468 SW |
2643 | rc = dasd_eer_init(); |
2644 | if (rc) | |
2645 | goto failed; | |
1da177e4 LT |
2646 | #ifdef CONFIG_PROC_FS |
2647 | rc = dasd_proc_init(); | |
2648 | if (rc) | |
2649 | goto failed; | |
2650 | #endif | |
2651 | ||
2652 | return 0; | |
2653 | failed: | |
fc19f381 | 2654 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
2655 | dasd_exit(); |
2656 | return rc; | |
2657 | } | |
2658 | ||
2659 | module_init(dasd_init); | |
2660 | module_exit(dasd_exit); | |
2661 | ||
2662 | EXPORT_SYMBOL(dasd_debug_area); | |
2663 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2664 | ||
2665 | EXPORT_SYMBOL(dasd_add_request_head); | |
2666 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2667 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2668 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2669 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2670 | EXPORT_SYMBOL(dasd_enable_device); |
2671 | EXPORT_SYMBOL(dasd_int_handler); | |
2672 | EXPORT_SYMBOL(dasd_kfree_request); | |
2673 | EXPORT_SYMBOL(dasd_kick_device); | |
2674 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2675 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2676 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2677 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2678 | EXPORT_SYMBOL(dasd_device_set_timer); |
2679 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2680 | EXPORT_SYMBOL(dasd_sfree_request); |
2681 | EXPORT_SYMBOL(dasd_sleep_on); | |
2682 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2683 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2684 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2685 | EXPORT_SYMBOL(dasd_start_IO); | |
2686 | EXPORT_SYMBOL(dasd_term_IO); | |
2687 | ||
2688 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2689 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2690 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2691 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2692 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2693 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2694 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2695 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2696 | EXPORT_SYMBOL_GPL(dasd_free_block); |