Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
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 | ||
3283942b | 14 | #include <linux/kernel_stat.h> |
1da177e4 LT |
15 | #include <linux/kmod.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/major.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/buffer_head.h> | |
a885c8c4 | 22 | #include <linux/hdreg.h> |
f3445a1a | 23 | #include <linux/async.h> |
9eb25122 | 24 | #include <linux/mutex.h> |
1da177e4 LT |
25 | |
26 | #include <asm/ccwdev.h> | |
27 | #include <asm/ebcdic.h> | |
28 | #include <asm/idals.h> | |
f3eb5384 | 29 | #include <asm/itcw.h> |
33b62a30 | 30 | #include <asm/diag.h> |
1da177e4 LT |
31 | |
32 | /* This is ugly... */ | |
33 | #define PRINTK_HEADER "dasd:" | |
34 | ||
35 | #include "dasd_int.h" | |
36 | /* | |
37 | * SECTION: Constant definitions to be used within this file | |
38 | */ | |
39 | #define DASD_CHANQ_MAX_SIZE 4 | |
40 | ||
1c1e093c SW |
41 | #define DASD_SLEEPON_START_TAG (void *) 1 |
42 | #define DASD_SLEEPON_END_TAG (void *) 2 | |
43 | ||
1da177e4 LT |
44 | /* |
45 | * SECTION: exported variables of dasd.c | |
46 | */ | |
47 | debug_info_t *dasd_debug_area; | |
48 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 49 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
50 | |
51 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
52 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
53 | " Copyright 2000 IBM Corporation"); | |
54 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
55 | MODULE_LICENSE("GPL"); |
56 | ||
57 | /* | |
58 | * SECTION: prototypes for static functions of dasd.c | |
59 | */ | |
8e09f215 SW |
60 | static int dasd_alloc_queue(struct dasd_block *); |
61 | static void dasd_setup_queue(struct dasd_block *); | |
62 | static void dasd_free_queue(struct dasd_block *); | |
63 | static void dasd_flush_request_queue(struct dasd_block *); | |
64 | static int dasd_flush_block_queue(struct dasd_block *); | |
65 | static void dasd_device_tasklet(struct dasd_device *); | |
66 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 67 | static void do_kick_device(struct work_struct *); |
d41dd122 | 68 | static void do_restore_device(struct work_struct *); |
501183f2 | 69 | static void do_reload_device(struct work_struct *); |
8e09f215 | 70 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
71 | static void dasd_device_timeout(unsigned long); |
72 | static void dasd_block_timeout(unsigned long); | |
eb6e199b | 73 | static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); |
1da177e4 LT |
74 | |
75 | /* | |
76 | * SECTION: Operations on the device structure. | |
77 | */ | |
78 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 79 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 80 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
81 | |
82 | /* | |
83 | * Allocate memory for a new device structure. | |
84 | */ | |
8e09f215 | 85 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
86 | { |
87 | struct dasd_device *device; | |
88 | ||
8e09f215 SW |
89 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
90 | if (!device) | |
1da177e4 | 91 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
92 | |
93 | /* Get two pages for normal block device operations. */ | |
94 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 95 | if (!device->ccw_mem) { |
1da177e4 LT |
96 | kfree(device); |
97 | return ERR_PTR(-ENOMEM); | |
98 | } | |
99 | /* Get one page for error recovery. */ | |
100 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 101 | if (!device->erp_mem) { |
1da177e4 LT |
102 | free_pages((unsigned long) device->ccw_mem, 1); |
103 | kfree(device); | |
104 | return ERR_PTR(-ENOMEM); | |
105 | } | |
106 | ||
107 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
108 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
109 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 110 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 111 | tasklet_init(&device->tasklet, |
8e09f215 | 112 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
113 | (unsigned long) device); |
114 | INIT_LIST_HEAD(&device->ccw_queue); | |
115 | init_timer(&device->timer); | |
48cae885 SW |
116 | device->timer.function = dasd_device_timeout; |
117 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 118 | INIT_WORK(&device->kick_work, do_kick_device); |
d41dd122 | 119 | INIT_WORK(&device->restore_device, do_restore_device); |
501183f2 | 120 | INIT_WORK(&device->reload_device, do_reload_device); |
1da177e4 LT |
121 | device->state = DASD_STATE_NEW; |
122 | device->target = DASD_STATE_NEW; | |
9eb25122 | 123 | mutex_init(&device->state_mutex); |
1da177e4 LT |
124 | |
125 | return device; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Free memory of a device structure. | |
130 | */ | |
8e09f215 | 131 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 132 | { |
17fd682e | 133 | kfree(device->private); |
1da177e4 LT |
134 | free_page((unsigned long) device->erp_mem); |
135 | free_pages((unsigned long) device->ccw_mem, 1); | |
136 | kfree(device); | |
137 | } | |
138 | ||
8e09f215 SW |
139 | /* |
140 | * Allocate memory for a new device structure. | |
141 | */ | |
142 | struct dasd_block *dasd_alloc_block(void) | |
143 | { | |
144 | struct dasd_block *block; | |
145 | ||
146 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
147 | if (!block) | |
148 | return ERR_PTR(-ENOMEM); | |
149 | /* open_count = 0 means device online but not in use */ | |
150 | atomic_set(&block->open_count, -1); | |
151 | ||
152 | spin_lock_init(&block->request_queue_lock); | |
153 | atomic_set(&block->tasklet_scheduled, 0); | |
154 | tasklet_init(&block->tasklet, | |
155 | (void (*)(unsigned long)) dasd_block_tasklet, | |
156 | (unsigned long) block); | |
157 | INIT_LIST_HEAD(&block->ccw_queue); | |
158 | spin_lock_init(&block->queue_lock); | |
159 | init_timer(&block->timer); | |
48cae885 SW |
160 | block->timer.function = dasd_block_timeout; |
161 | block->timer.data = (unsigned long) block; | |
8e09f215 SW |
162 | |
163 | return block; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Free memory of a device structure. | |
168 | */ | |
169 | void dasd_free_block(struct dasd_block *block) | |
170 | { | |
171 | kfree(block); | |
172 | } | |
173 | ||
1da177e4 LT |
174 | /* |
175 | * Make a new device known to the system. | |
176 | */ | |
8e09f215 | 177 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
178 | { |
179 | int rc; | |
180 | ||
181 | /* | |
138c014d | 182 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
183 | * keep the reference count > 0. |
184 | */ | |
185 | dasd_get_device(device); | |
186 | ||
8e09f215 SW |
187 | if (device->block) { |
188 | rc = dasd_alloc_queue(device->block); | |
189 | if (rc) { | |
190 | dasd_put_device(device); | |
191 | return rc; | |
192 | } | |
1da177e4 | 193 | } |
1da177e4 LT |
194 | device->state = DASD_STATE_KNOWN; |
195 | return 0; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Let the system forget about a device. | |
200 | */ | |
8e09f215 | 201 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 202 | { |
20c64468 SW |
203 | /* Disable extended error reporting for this device. */ |
204 | dasd_eer_disable(device); | |
1da177e4 | 205 | /* Forget the discipline information. */ |
8e09f215 SW |
206 | if (device->discipline) { |
207 | if (device->discipline->uncheck_device) | |
208 | device->discipline->uncheck_device(device); | |
aa88861f | 209 | module_put(device->discipline->owner); |
8e09f215 | 210 | } |
1da177e4 | 211 | device->discipline = NULL; |
aa88861f PO |
212 | if (device->base_discipline) |
213 | module_put(device->base_discipline->owner); | |
214 | device->base_discipline = NULL; | |
1da177e4 LT |
215 | device->state = DASD_STATE_NEW; |
216 | ||
8e09f215 SW |
217 | if (device->block) |
218 | dasd_free_queue(device->block); | |
1da177e4 LT |
219 | |
220 | /* Give up reference we took in dasd_state_new_to_known. */ | |
221 | dasd_put_device(device); | |
8f61701b | 222 | return 0; |
1da177e4 LT |
223 | } |
224 | ||
225 | /* | |
226 | * Request the irq line for the device. | |
227 | */ | |
8e09f215 | 228 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
229 | { |
230 | int rc; | |
231 | ||
232 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
233 | if (device->block) { |
234 | rc = dasd_gendisk_alloc(device->block); | |
235 | if (rc) | |
236 | return rc; | |
237 | } | |
1da177e4 | 238 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 239 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 240 | 8 * sizeof(long)); |
1da177e4 | 241 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 242 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
243 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
244 | ||
245 | device->state = DASD_STATE_BASIC; | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* | |
250 | * Release the irq line for the device. Terminate any running i/o. | |
251 | */ | |
8e09f215 | 252 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 253 | { |
8f61701b | 254 | int rc; |
8e09f215 SW |
255 | if (device->block) { |
256 | dasd_gendisk_free(device->block); | |
257 | dasd_block_clear_timer(device->block); | |
258 | } | |
259 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
260 | if (rc) |
261 | return rc; | |
8e09f215 | 262 | dasd_device_clear_timer(device); |
8f61701b | 263 | |
1da177e4 LT |
264 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
265 | if (device->debug_area != NULL) { | |
266 | debug_unregister(device->debug_area); | |
267 | device->debug_area = NULL; | |
268 | } | |
269 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 270 | return 0; |
1da177e4 LT |
271 | } |
272 | ||
273 | /* | |
274 | * Do the initial analysis. The do_analysis function may return | |
275 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
276 | * until the discipline decides to continue the startup sequence | |
277 | * by calling the function dasd_change_state. The eckd disciplines | |
278 | * uses this to start a ccw that detects the format. The completion | |
279 | * interrupt for this detection ccw uses the kernel event daemon to | |
280 | * trigger the call to dasd_change_state. All this is done in the | |
281 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
282 | * After the analysis ccw is done (do_analysis returned 0) the block |
283 | * device is setup. | |
284 | * In case the analysis returns an error, the device setup is stopped | |
285 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 286 | */ |
8e09f215 | 287 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
288 | { |
289 | int rc; | |
8e09f215 | 290 | struct dasd_block *block; |
1da177e4 LT |
291 | |
292 | rc = 0; | |
8e09f215 | 293 | block = device->block; |
90f0094d | 294 | /* make disk known with correct capacity */ |
8e09f215 SW |
295 | if (block) { |
296 | if (block->base->discipline->do_analysis != NULL) | |
297 | rc = block->base->discipline->do_analysis(block); | |
298 | if (rc) { | |
299 | if (rc != -EAGAIN) | |
300 | device->state = DASD_STATE_UNFMT; | |
301 | return rc; | |
302 | } | |
303 | dasd_setup_queue(block); | |
304 | set_capacity(block->gdp, | |
305 | block->blocks << block->s2b_shift); | |
306 | device->state = DASD_STATE_READY; | |
307 | rc = dasd_scan_partitions(block); | |
308 | if (rc) | |
309 | device->state = DASD_STATE_BASIC; | |
310 | } else { | |
311 | device->state = DASD_STATE_READY; | |
312 | } | |
90f0094d | 313 | return rc; |
1da177e4 LT |
314 | } |
315 | ||
316 | /* | |
317 | * Remove device from block device layer. Destroy dirty buffers. | |
318 | * Forget format information. Check if the target level is basic | |
319 | * and if it is create fake disk for formatting. | |
320 | */ | |
8e09f215 | 321 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 322 | { |
8f61701b HH |
323 | int rc; |
324 | ||
1da177e4 | 325 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
326 | if (device->block) { |
327 | struct dasd_block *block = device->block; | |
328 | rc = dasd_flush_block_queue(block); | |
329 | if (rc) { | |
330 | device->state = DASD_STATE_READY; | |
331 | return rc; | |
332 | } | |
8e09f215 | 333 | dasd_flush_request_queue(block); |
b695adfa | 334 | dasd_destroy_partitions(block); |
8e09f215 SW |
335 | block->blocks = 0; |
336 | block->bp_block = 0; | |
337 | block->s2b_shift = 0; | |
338 | } | |
8f61701b | 339 | return 0; |
1da177e4 LT |
340 | } |
341 | ||
90f0094d HH |
342 | /* |
343 | * Back to basic. | |
344 | */ | |
8e09f215 | 345 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
346 | { |
347 | device->state = DASD_STATE_BASIC; | |
8f61701b | 348 | return 0; |
90f0094d HH |
349 | } |
350 | ||
1da177e4 LT |
351 | /* |
352 | * Make the device online and schedule the bottom half to start | |
353 | * the requeueing of requests from the linux request queue to the | |
354 | * ccw queue. | |
355 | */ | |
8f61701b | 356 | static int |
1da177e4 LT |
357 | dasd_state_ready_to_online(struct dasd_device * device) |
358 | { | |
8e09f215 | 359 | int rc; |
1301809b SW |
360 | struct gendisk *disk; |
361 | struct disk_part_iter piter; | |
362 | struct hd_struct *part; | |
8e09f215 SW |
363 | |
364 | if (device->discipline->ready_to_online) { | |
365 | rc = device->discipline->ready_to_online(device); | |
366 | if (rc) | |
367 | return rc; | |
368 | } | |
1da177e4 | 369 | device->state = DASD_STATE_ONLINE; |
1301809b | 370 | if (device->block) { |
8e09f215 | 371 | dasd_schedule_block_bh(device->block); |
e4dbb0f2 SH |
372 | if ((device->features & DASD_FEATURE_USERAW)) { |
373 | disk = device->block->gdp; | |
374 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
375 | return 0; | |
376 | } | |
1301809b SW |
377 | disk = device->block->bdev->bd_disk; |
378 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
379 | while ((part = disk_part_iter_next(&piter))) | |
380 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
381 | disk_part_iter_exit(&piter); | |
382 | } | |
1da177e4 LT |
383 | return 0; |
384 | } | |
385 | ||
386 | /* | |
387 | * Stop the requeueing of requests again. | |
388 | */ | |
8e09f215 | 389 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 390 | { |
8e09f215 | 391 | int rc; |
1301809b SW |
392 | struct gendisk *disk; |
393 | struct disk_part_iter piter; | |
394 | struct hd_struct *part; | |
8e09f215 SW |
395 | |
396 | if (device->discipline->online_to_ready) { | |
397 | rc = device->discipline->online_to_ready(device); | |
398 | if (rc) | |
399 | return rc; | |
400 | } | |
1da177e4 | 401 | device->state = DASD_STATE_READY; |
e4dbb0f2 | 402 | if (device->block && !(device->features & DASD_FEATURE_USERAW)) { |
1301809b SW |
403 | disk = device->block->bdev->bd_disk; |
404 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
405 | while ((part = disk_part_iter_next(&piter))) | |
406 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
407 | disk_part_iter_exit(&piter); | |
408 | } | |
8f61701b | 409 | return 0; |
1da177e4 LT |
410 | } |
411 | ||
412 | /* | |
413 | * Device startup state changes. | |
414 | */ | |
8e09f215 | 415 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
416 | { |
417 | int rc; | |
418 | ||
419 | rc = 0; | |
420 | if (device->state == DASD_STATE_NEW && | |
421 | device->target >= DASD_STATE_KNOWN) | |
422 | rc = dasd_state_new_to_known(device); | |
423 | ||
424 | if (!rc && | |
425 | device->state == DASD_STATE_KNOWN && | |
426 | device->target >= DASD_STATE_BASIC) | |
427 | rc = dasd_state_known_to_basic(device); | |
428 | ||
429 | if (!rc && | |
430 | device->state == DASD_STATE_BASIC && | |
431 | device->target >= DASD_STATE_READY) | |
432 | rc = dasd_state_basic_to_ready(device); | |
433 | ||
39ccf95e HH |
434 | if (!rc && |
435 | device->state == DASD_STATE_UNFMT && | |
436 | device->target > DASD_STATE_UNFMT) | |
437 | rc = -EPERM; | |
438 | ||
1da177e4 LT |
439 | if (!rc && |
440 | device->state == DASD_STATE_READY && | |
441 | device->target >= DASD_STATE_ONLINE) | |
442 | rc = dasd_state_ready_to_online(device); | |
443 | ||
444 | return rc; | |
445 | } | |
446 | ||
447 | /* | |
448 | * Device shutdown state changes. | |
449 | */ | |
8e09f215 | 450 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 451 | { |
8f61701b HH |
452 | int rc; |
453 | ||
454 | rc = 0; | |
1da177e4 LT |
455 | if (device->state == DASD_STATE_ONLINE && |
456 | device->target <= DASD_STATE_READY) | |
8f61701b | 457 | rc = dasd_state_online_to_ready(device); |
138c014d | 458 | |
8f61701b HH |
459 | if (!rc && |
460 | device->state == DASD_STATE_READY && | |
1da177e4 | 461 | device->target <= DASD_STATE_BASIC) |
8f61701b | 462 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 463 | |
8f61701b HH |
464 | if (!rc && |
465 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 466 | device->target <= DASD_STATE_BASIC) |
8f61701b | 467 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 468 | |
8f61701b HH |
469 | if (!rc && |
470 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 471 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 472 | rc = dasd_state_basic_to_known(device); |
138c014d | 473 | |
8f61701b HH |
474 | if (!rc && |
475 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 476 | device->target <= DASD_STATE_NEW) |
8f61701b | 477 | rc = dasd_state_known_to_new(device); |
1da177e4 | 478 | |
8f61701b | 479 | return rc; |
1da177e4 LT |
480 | } |
481 | ||
482 | /* | |
483 | * This is the main startup/shutdown routine. | |
484 | */ | |
8e09f215 | 485 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 | 486 | { |
181d9522 | 487 | int rc; |
1da177e4 LT |
488 | |
489 | if (device->state == device->target) | |
490 | /* Already where we want to go today... */ | |
491 | return; | |
492 | if (device->state < device->target) | |
493 | rc = dasd_increase_state(device); | |
494 | else | |
495 | rc = dasd_decrease_state(device); | |
181d9522 SO |
496 | if (rc == -EAGAIN) |
497 | return; | |
498 | if (rc) | |
499 | device->target = device->state; | |
1da177e4 | 500 | |
9eb25122 | 501 | if (device->state == device->target) |
1da177e4 | 502 | wake_up(&dasd_init_waitq); |
4dfd5c45 HH |
503 | |
504 | /* let user-space know that the device status changed */ | |
505 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
506 | } |
507 | ||
508 | /* | |
509 | * Kick starter for devices that did not complete the startup/shutdown | |
510 | * procedure or were sleeping because of a pending state. | |
511 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
512 | * event daemon. | |
513 | */ | |
8e09f215 | 514 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 515 | { |
4927b3f7 | 516 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
9eb25122 | 517 | mutex_lock(&device->state_mutex); |
1da177e4 | 518 | dasd_change_state(device); |
9eb25122 | 519 | mutex_unlock(&device->state_mutex); |
8e09f215 | 520 | dasd_schedule_device_bh(device); |
1da177e4 LT |
521 | dasd_put_device(device); |
522 | } | |
523 | ||
8e09f215 | 524 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
525 | { |
526 | dasd_get_device(device); | |
527 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
528 | schedule_work(&device->kick_work); | |
529 | } | |
530 | ||
501183f2 SH |
531 | /* |
532 | * dasd_reload_device will schedule a call do do_reload_device to the kernel | |
533 | * event daemon. | |
534 | */ | |
535 | static void do_reload_device(struct work_struct *work) | |
536 | { | |
537 | struct dasd_device *device = container_of(work, struct dasd_device, | |
538 | reload_device); | |
539 | device->discipline->reload(device); | |
540 | dasd_put_device(device); | |
541 | } | |
542 | ||
543 | void dasd_reload_device(struct dasd_device *device) | |
544 | { | |
545 | dasd_get_device(device); | |
546 | /* queue call to dasd_reload_device to the kernel event daemon. */ | |
547 | schedule_work(&device->reload_device); | |
548 | } | |
549 | EXPORT_SYMBOL(dasd_reload_device); | |
550 | ||
d41dd122 SH |
551 | /* |
552 | * dasd_restore_device will schedule a call do do_restore_device to the kernel | |
553 | * event daemon. | |
554 | */ | |
555 | static void do_restore_device(struct work_struct *work) | |
556 | { | |
557 | struct dasd_device *device = container_of(work, struct dasd_device, | |
558 | restore_device); | |
559 | device->cdev->drv->restore(device->cdev); | |
560 | dasd_put_device(device); | |
561 | } | |
562 | ||
563 | void dasd_restore_device(struct dasd_device *device) | |
564 | { | |
565 | dasd_get_device(device); | |
566 | /* queue call to dasd_restore_device to the kernel event daemon. */ | |
567 | schedule_work(&device->restore_device); | |
568 | } | |
569 | ||
1da177e4 LT |
570 | /* |
571 | * Set the target state for a device and starts the state change. | |
572 | */ | |
8e09f215 | 573 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 574 | { |
f3445a1a | 575 | dasd_get_device(device); |
9eb25122 | 576 | mutex_lock(&device->state_mutex); |
1da177e4 LT |
577 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
578 | if (dasd_probeonly && target > DASD_STATE_READY) | |
579 | target = DASD_STATE_READY; | |
580 | if (device->target != target) { | |
9eb25122 | 581 | if (device->state == target) |
1da177e4 LT |
582 | wake_up(&dasd_init_waitq); |
583 | device->target = target; | |
584 | } | |
585 | if (device->state != device->target) | |
586 | dasd_change_state(device); | |
9eb25122 SH |
587 | mutex_unlock(&device->state_mutex); |
588 | dasd_put_device(device); | |
1da177e4 LT |
589 | } |
590 | ||
591 | /* | |
592 | * Enable devices with device numbers in [from..to]. | |
593 | */ | |
8e09f215 | 594 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
595 | { |
596 | return (device->state == device->target); | |
597 | } | |
598 | ||
8e09f215 | 599 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
600 | { |
601 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
602 | if (device->state <= DASD_STATE_KNOWN) | |
603 | /* No discipline for device found. */ | |
604 | dasd_set_target_state(device, DASD_STATE_NEW); | |
605 | /* Now wait for the devices to come up. */ | |
606 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
607 | } | |
608 | ||
609 | /* | |
610 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
611 | */ | |
612 | #ifdef CONFIG_DASD_PROFILE | |
613 | ||
614 | struct dasd_profile_info_t dasd_global_profile; | |
615 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
616 | ||
617 | /* | |
618 | * Increments counter in global and local profiling structures. | |
619 | */ | |
8e09f215 | 620 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
621 | { \ |
622 | int index; \ | |
623 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
624 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 625 | block->profile.counter[index]++; \ |
1da177e4 LT |
626 | } |
627 | ||
628 | /* | |
629 | * Add profiling information for cqr before execution. | |
630 | */ | |
8e09f215 SW |
631 | static void dasd_profile_start(struct dasd_block *block, |
632 | struct dasd_ccw_req *cqr, | |
633 | struct request *req) | |
1da177e4 LT |
634 | { |
635 | struct list_head *l; | |
636 | unsigned int counter; | |
637 | ||
638 | if (dasd_profile_level != DASD_PROFILE_ON) | |
639 | return; | |
640 | ||
641 | /* count the length of the chanq for statistics */ | |
642 | counter = 0; | |
8e09f215 | 643 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
644 | if (++counter >= 31) |
645 | break; | |
646 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 647 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
648 | } |
649 | ||
650 | /* | |
651 | * Add profiling information for cqr after execution. | |
652 | */ | |
8e09f215 SW |
653 | static void dasd_profile_end(struct dasd_block *block, |
654 | struct dasd_ccw_req *cqr, | |
655 | struct request *req) | |
1da177e4 LT |
656 | { |
657 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
658 | long tottimeps, sectors; | |
659 | ||
660 | if (dasd_profile_level != DASD_PROFILE_ON) | |
661 | return; | |
662 | ||
83096ebf | 663 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
664 | if (!cqr->buildclk || !cqr->startclk || |
665 | !cqr->stopclk || !cqr->endclk || | |
666 | !sectors) | |
667 | return; | |
668 | ||
669 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
670 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
671 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
672 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
673 | tottimeps = tottime / sectors; | |
674 | ||
675 | if (!dasd_global_profile.dasd_io_reqs) | |
676 | memset(&dasd_global_profile, 0, | |
8e09f215 | 677 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
678 | dasd_global_profile.dasd_io_reqs++; |
679 | dasd_global_profile.dasd_io_sects += sectors; | |
680 | ||
8e09f215 SW |
681 | if (!block->profile.dasd_io_reqs) |
682 | memset(&block->profile, 0, | |
683 | sizeof(struct dasd_profile_info_t)); | |
684 | block->profile.dasd_io_reqs++; | |
685 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 686 | |
8e09f215 SW |
687 | dasd_profile_counter(sectors, dasd_io_secs, block); |
688 | dasd_profile_counter(tottime, dasd_io_times, block); | |
689 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
690 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
691 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
692 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
693 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
694 | } |
695 | #else | |
8e09f215 SW |
696 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
697 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
698 | #endif /* CONFIG_DASD_PROFILE */ |
699 | ||
700 | /* | |
701 | * Allocate memory for a channel program with 'cplength' channel | |
702 | * command words and 'datasize' additional space. There are two | |
703 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
704 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
705 | * that gets allocated for each device. | |
706 | */ | |
68b781fe | 707 | struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, |
8e09f215 SW |
708 | int datasize, |
709 | struct dasd_device *device) | |
1da177e4 LT |
710 | { |
711 | struct dasd_ccw_req *cqr; | |
712 | ||
713 | /* Sanity checks */ | |
68b781fe | 714 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 715 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 | 716 | |
88abaab4 | 717 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
718 | if (cqr == NULL) |
719 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
720 | cqr->cpaddr = NULL; |
721 | if (cplength > 0) { | |
88abaab4 | 722 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
723 | GFP_ATOMIC | GFP_DMA); |
724 | if (cqr->cpaddr == NULL) { | |
725 | kfree(cqr); | |
726 | return ERR_PTR(-ENOMEM); | |
727 | } | |
1da177e4 LT |
728 | } |
729 | cqr->data = NULL; | |
730 | if (datasize > 0) { | |
88abaab4 | 731 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 732 | if (cqr->data == NULL) { |
17fd682e | 733 | kfree(cqr->cpaddr); |
1da177e4 LT |
734 | kfree(cqr); |
735 | return ERR_PTR(-ENOMEM); | |
736 | } | |
1da177e4 | 737 | } |
68b781fe | 738 | cqr->magic = magic; |
1da177e4 LT |
739 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
740 | dasd_get_device(device); | |
741 | return cqr; | |
742 | } | |
743 | ||
68b781fe | 744 | struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
8e09f215 SW |
745 | int datasize, |
746 | struct dasd_device *device) | |
1da177e4 LT |
747 | { |
748 | unsigned long flags; | |
749 | struct dasd_ccw_req *cqr; | |
750 | char *data; | |
751 | int size; | |
752 | ||
1da177e4 LT |
753 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; |
754 | if (cplength > 0) | |
755 | size += cplength * sizeof(struct ccw1); | |
756 | if (datasize > 0) | |
757 | size += datasize; | |
758 | spin_lock_irqsave(&device->mem_lock, flags); | |
759 | cqr = (struct dasd_ccw_req *) | |
760 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
761 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
762 | if (cqr == NULL) | |
763 | return ERR_PTR(-ENOMEM); | |
764 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
765 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
766 | cqr->cpaddr = NULL; | |
767 | if (cplength > 0) { | |
768 | cqr->cpaddr = (struct ccw1 *) data; | |
769 | data += cplength*sizeof(struct ccw1); | |
770 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
771 | } | |
772 | cqr->data = NULL; | |
773 | if (datasize > 0) { | |
774 | cqr->data = data; | |
775 | memset(cqr->data, 0, datasize); | |
776 | } | |
68b781fe | 777 | cqr->magic = magic; |
1da177e4 LT |
778 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
779 | dasd_get_device(device); | |
780 | return cqr; | |
781 | } | |
782 | ||
783 | /* | |
784 | * Free memory of a channel program. This function needs to free all the | |
785 | * idal lists that might have been created by dasd_set_cda and the | |
786 | * struct dasd_ccw_req itself. | |
787 | */ | |
8e09f215 | 788 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 789 | { |
347a8dc3 | 790 | #ifdef CONFIG_64BIT |
1da177e4 LT |
791 | struct ccw1 *ccw; |
792 | ||
793 | /* Clear any idals used for the request. */ | |
794 | ccw = cqr->cpaddr; | |
795 | do { | |
796 | clear_normalized_cda(ccw); | |
797 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
798 | #endif | |
17fd682e JJ |
799 | kfree(cqr->cpaddr); |
800 | kfree(cqr->data); | |
1da177e4 LT |
801 | kfree(cqr); |
802 | dasd_put_device(device); | |
803 | } | |
804 | ||
8e09f215 | 805 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
806 | { |
807 | unsigned long flags; | |
808 | ||
809 | spin_lock_irqsave(&device->mem_lock, flags); | |
810 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
811 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
812 | dasd_put_device(device); | |
813 | } | |
814 | ||
815 | /* | |
816 | * Check discipline magic in cqr. | |
817 | */ | |
8e09f215 | 818 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
819 | { |
820 | struct dasd_device *device; | |
821 | ||
822 | if (cqr == NULL) | |
823 | return -EINVAL; | |
8e09f215 | 824 | device = cqr->startdev; |
1da177e4 | 825 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 826 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
827 | " dasd_ccw_req 0x%08x magic doesn't match" |
828 | " discipline 0x%08x", | |
829 | cqr->magic, | |
830 | *(unsigned int *) device->discipline->name); | |
831 | return -EINVAL; | |
832 | } | |
833 | return 0; | |
834 | } | |
835 | ||
836 | /* | |
837 | * Terminate the current i/o and set the request to clear_pending. | |
838 | * Timer keeps device runnig. | |
839 | * ccw_device_clear can fail if the i/o subsystem | |
840 | * is in a bad mood. | |
841 | */ | |
8e09f215 | 842 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
843 | { |
844 | struct dasd_device *device; | |
845 | int retries, rc; | |
fc19f381 | 846 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
847 | |
848 | /* Check the cqr */ | |
849 | rc = dasd_check_cqr(cqr); | |
850 | if (rc) | |
851 | return rc; | |
852 | retries = 0; | |
8e09f215 | 853 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
854 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
855 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
856 | switch (rc) { | |
857 | case 0: /* termination successful */ | |
8e09f215 | 858 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 859 | cqr->stopclk = get_clock(); |
8f61701b | 860 | cqr->starttime = 0; |
1da177e4 LT |
861 | DBF_DEV_EVENT(DBF_DEBUG, device, |
862 | "terminate cqr %p successful", | |
863 | cqr); | |
864 | break; | |
865 | case -ENODEV: | |
866 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
867 | "device gone, retry"); | |
868 | break; | |
869 | case -EIO: | |
870 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
871 | "I/O error, retry"); | |
872 | break; | |
873 | case -EINVAL: | |
874 | case -EBUSY: | |
875 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
876 | "device busy, retry later"); | |
877 | break; | |
878 | default: | |
fc19f381 SH |
879 | /* internal error 10 - unknown rc*/ |
880 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
881 | dev_err(&device->cdev->dev, "An error occurred in the " | |
882 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
883 | BUG(); |
884 | break; | |
885 | } | |
886 | retries++; | |
887 | } | |
8e09f215 | 888 | dasd_schedule_device_bh(device); |
1da177e4 LT |
889 | return rc; |
890 | } | |
891 | ||
892 | /* | |
893 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
894 | * In that case set up a timer to start the request later. | |
895 | */ | |
8e09f215 | 896 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
897 | { |
898 | struct dasd_device *device; | |
899 | int rc; | |
fc19f381 | 900 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
901 | |
902 | /* Check the cqr */ | |
903 | rc = dasd_check_cqr(cqr); | |
6cc7f168 SW |
904 | if (rc) { |
905 | cqr->intrc = rc; | |
1da177e4 | 906 | return rc; |
6cc7f168 | 907 | } |
8e09f215 | 908 | device = (struct dasd_device *) cqr->startdev; |
5a27e60d SW |
909 | if (((cqr->block && |
910 | test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || | |
911 | test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && | |
912 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
913 | DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " | |
914 | "because of stolen lock", cqr); | |
915 | cqr->status = DASD_CQR_ERROR; | |
916 | cqr->intrc = -EPERM; | |
917 | return -EPERM; | |
918 | } | |
1da177e4 | 919 | if (cqr->retries < 0) { |
fc19f381 SH |
920 | /* internal error 14 - start_IO run out of retries */ |
921 | sprintf(errorstring, "14 %p", cqr); | |
922 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
923 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 924 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
925 | return -EIO; |
926 | } | |
927 | cqr->startclk = get_clock(); | |
928 | cqr->starttime = jiffies; | |
929 | cqr->retries--; | |
a4d26c6a SW |
930 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
931 | cqr->lpm &= device->path_data.opm; | |
932 | if (!cqr->lpm) | |
933 | cqr->lpm = device->path_data.opm; | |
934 | } | |
f3eb5384 SW |
935 | if (cqr->cpmode == 1) { |
936 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
937 | (long) cqr, cqr->lpm); | |
938 | } else { | |
939 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
940 | (long) cqr, cqr->lpm, 0); | |
941 | } | |
1da177e4 LT |
942 | switch (rc) { |
943 | case 0: | |
944 | cqr->status = DASD_CQR_IN_IO; | |
1da177e4 LT |
945 | break; |
946 | case -EBUSY: | |
a4d26c6a | 947 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
948 | "start_IO: device busy, retry later"); |
949 | break; | |
950 | case -ETIMEDOUT: | |
a4d26c6a | 951 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
952 | "start_IO: request timeout, retry later"); |
953 | break; | |
954 | case -EACCES: | |
a4d26c6a SW |
955 | /* -EACCES indicates that the request used only a subset of the |
956 | * available paths and all these paths are gone. If the lpm of | |
957 | * this request was only a subset of the opm (e.g. the ppm) then | |
958 | * we just do a retry with all available paths. | |
959 | * If we already use the full opm, something is amiss, and we | |
960 | * need a full path verification. | |
1da177e4 | 961 | */ |
a4d26c6a SW |
962 | if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
963 | DBF_DEV_EVENT(DBF_WARNING, device, | |
964 | "start_IO: selected paths gone (%x)", | |
965 | cqr->lpm); | |
966 | } else if (cqr->lpm != device->path_data.opm) { | |
967 | cqr->lpm = device->path_data.opm; | |
968 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", | |
969 | "start_IO: selected paths gone," | |
970 | " retry on all paths"); | |
971 | } else { | |
972 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", | |
973 | "start_IO: all paths in opm gone," | |
974 | " do path verification"); | |
975 | dasd_generic_last_path_gone(device); | |
976 | device->path_data.opm = 0; | |
977 | device->path_data.ppm = 0; | |
978 | device->path_data.npm = 0; | |
979 | device->path_data.tbvpm = | |
980 | ccw_device_get_path_mask(device->cdev); | |
981 | } | |
1da177e4 LT |
982 | break; |
983 | case -ENODEV: | |
a4d26c6a | 984 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
f3eb5384 SW |
985 | "start_IO: -ENODEV device gone, retry"); |
986 | break; | |
1da177e4 | 987 | case -EIO: |
a4d26c6a | 988 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
f3eb5384 | 989 | "start_IO: -EIO device gone, retry"); |
1da177e4 | 990 | break; |
d41dd122 SH |
991 | case -EINVAL: |
992 | /* most likely caused in power management context */ | |
a4d26c6a | 993 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
d41dd122 SH |
994 | "start_IO: -EINVAL device currently " |
995 | "not accessible"); | |
996 | break; | |
1da177e4 | 997 | default: |
fc19f381 SH |
998 | /* internal error 11 - unknown rc */ |
999 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
1000 | dev_err(&device->cdev->dev, | |
1001 | "An error occurred in the DASD device driver, " | |
1002 | "reason=%s\n", errorstring); | |
1da177e4 LT |
1003 | BUG(); |
1004 | break; | |
1005 | } | |
6cc7f168 | 1006 | cqr->intrc = rc; |
1da177e4 LT |
1007 | return rc; |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Timeout function for dasd devices. This is used for different purposes | |
1012 | * 1) missing interrupt handler for normal operation | |
1013 | * 2) delayed start of request where start_IO failed with -EBUSY | |
1014 | * 3) timeout for missing state change interrupts | |
1015 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
1016 | * DASD_CQR_QUEUED for 2) and 3). | |
1017 | */ | |
8e09f215 | 1018 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
1019 | { |
1020 | unsigned long flags; | |
1021 | struct dasd_device *device; | |
1022 | ||
1023 | device = (struct dasd_device *) ptr; | |
1024 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1025 | /* re-activate request queue */ | |
eb6e199b | 1026 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
1da177e4 | 1027 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
8e09f215 | 1028 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1029 | } |
1030 | ||
1031 | /* | |
1032 | * Setup timeout for a device in jiffies. | |
1033 | */ | |
8e09f215 | 1034 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 1035 | { |
48cae885 SW |
1036 | if (expires == 0) |
1037 | del_timer(&device->timer); | |
1038 | else | |
1039 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 LT |
1040 | } |
1041 | ||
1042 | /* | |
1043 | * Clear timeout for a device. | |
1044 | */ | |
8e09f215 | 1045 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 1046 | { |
48cae885 | 1047 | del_timer(&device->timer); |
1da177e4 LT |
1048 | } |
1049 | ||
8e09f215 SW |
1050 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
1051 | unsigned long intparm) | |
1da177e4 LT |
1052 | { |
1053 | struct dasd_ccw_req *cqr; | |
1054 | struct dasd_device *device; | |
1055 | ||
f16f5843 SW |
1056 | if (!intparm) |
1057 | return; | |
1da177e4 LT |
1058 | cqr = (struct dasd_ccw_req *) intparm; |
1059 | if (cqr->status != DASD_CQR_IN_IO) { | |
b8ed5dd5 SH |
1060 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, |
1061 | "invalid status in handle_killed_request: " | |
1062 | "%02x", cqr->status); | |
1da177e4 LT |
1063 | return; |
1064 | } | |
1065 | ||
589c74d5 SH |
1066 | device = dasd_device_from_cdev_locked(cdev); |
1067 | if (IS_ERR(device)) { | |
1068 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", | |
1069 | "unable to get device from cdev"); | |
1070 | return; | |
1071 | } | |
1072 | ||
1073 | if (!cqr->startdev || | |
1074 | device != cqr->startdev || | |
1075 | strncmp(cqr->startdev->discipline->ebcname, | |
1076 | (char *) &cqr->magic, 4)) { | |
294001a8 SH |
1077 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1078 | "invalid device in request"); | |
589c74d5 | 1079 | dasd_put_device(device); |
1da177e4 LT |
1080 | return; |
1081 | } | |
1082 | ||
1083 | /* Schedule request to be retried. */ | |
1084 | cqr->status = DASD_CQR_QUEUED; | |
1085 | ||
8e09f215 SW |
1086 | dasd_device_clear_timer(device); |
1087 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1088 | dasd_put_device(device); |
1089 | } | |
1090 | ||
8e09f215 | 1091 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 1092 | { |
20c64468 SW |
1093 | /* First of all start sense subsystem status request. */ |
1094 | dasd_eer_snss(device); | |
1095 | ||
eb6e199b | 1096 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
8e09f215 SW |
1097 | dasd_schedule_device_bh(device); |
1098 | if (device->block) | |
1099 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
1100 | } |
1101 | ||
1102 | /* | |
1103 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1104 | */ | |
8e09f215 SW |
1105 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1106 | struct irb *irb) | |
1da177e4 LT |
1107 | { |
1108 | struct dasd_ccw_req *cqr, *next; | |
1109 | struct dasd_device *device; | |
1110 | unsigned long long now; | |
1111 | int expires; | |
1da177e4 | 1112 | |
3283942b | 1113 | kstat_cpu(smp_processor_id()).irqs[IOINT_DAS]++; |
1da177e4 LT |
1114 | if (IS_ERR(irb)) { |
1115 | switch (PTR_ERR(irb)) { | |
1116 | case -EIO: | |
1da177e4 LT |
1117 | break; |
1118 | case -ETIMEDOUT: | |
b8ed5dd5 SH |
1119 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1120 | "request timed out\n", __func__); | |
1da177e4 LT |
1121 | break; |
1122 | default: | |
b8ed5dd5 SH |
1123 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1124 | "unknown error %ld\n", __func__, | |
1125 | PTR_ERR(irb)); | |
1da177e4 | 1126 | } |
f16f5843 | 1127 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1128 | return; |
1129 | } | |
1130 | ||
1131 | now = get_clock(); | |
8e09f215 | 1132 | cqr = (struct dasd_ccw_req *) intparm; |
5a27e60d SW |
1133 | /* check for conditions that should be handled immediately */ |
1134 | if (!cqr || | |
1135 | !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
1136 | scsw_cstat(&irb->scsw) == 0)) { | |
a5a0061f SW |
1137 | if (cqr) |
1138 | memcpy(&cqr->irb, irb, sizeof(*irb)); | |
a00bfd71 | 1139 | device = dasd_device_from_cdev_locked(cdev); |
56b86b61 SH |
1140 | if (IS_ERR(device)) |
1141 | return; | |
1142 | /* ignore unsolicited interrupts for DIAG discipline */ | |
1143 | if (device->discipline == dasd_diag_discipline_pointer) { | |
1da177e4 | 1144 | dasd_put_device(device); |
56b86b61 | 1145 | return; |
1da177e4 | 1146 | } |
5a27e60d SW |
1147 | device->discipline->dump_sense_dbf(device, irb, "int"); |
1148 | if (device->features & DASD_FEATURE_ERPLOG) | |
1149 | device->discipline->dump_sense(device, cqr, irb); | |
1150 | device->discipline->check_for_device_change(device, cqr, irb); | |
56b86b61 | 1151 | dasd_put_device(device); |
1da177e4 | 1152 | } |
5a27e60d SW |
1153 | if (!cqr) |
1154 | return; | |
1da177e4 | 1155 | |
8e09f215 SW |
1156 | device = (struct dasd_device *) cqr->startdev; |
1157 | if (!device || | |
1da177e4 | 1158 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
294001a8 SH |
1159 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1160 | "invalid device in request"); | |
1da177e4 LT |
1161 | return; |
1162 | } | |
1163 | ||
1164 | /* Check for clear pending */ | |
8e09f215 | 1165 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1166 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1167 | cqr->status = DASD_CQR_CLEARED; |
1168 | dasd_device_clear_timer(device); | |
8f61701b | 1169 | wake_up(&dasd_flush_wq); |
8e09f215 | 1170 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1171 | return; |
1172 | } | |
1173 | ||
f3eb5384 | 1174 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1175 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1176 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1177 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1178 | return; |
1179 | } | |
fc19f381 | 1180 | |
8e09f215 | 1181 | next = NULL; |
1da177e4 | 1182 | expires = 0; |
f3eb5384 SW |
1183 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1184 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1185 | /* request was completed successfully */ |
1186 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1187 | cqr->stopclk = now; |
1188 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1189 | if (cqr->devlist.next != &device->ccw_queue) { |
1190 | next = list_entry(cqr->devlist.next, | |
1191 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1192 | } |
8e09f215 | 1193 | } else { /* error */ |
6c5f57c7 SH |
1194 | /* |
1195 | * If we don't want complex ERP for this request, then just | |
1196 | * reset this and retry it in the fastpath | |
8e09f215 | 1197 | */ |
6c5f57c7 | 1198 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1199 | cqr->retries > 0) { |
a4d26c6a | 1200 | if (cqr->lpm == device->path_data.opm) |
fc19f381 SH |
1201 | DBF_DEV_EVENT(DBF_DEBUG, device, |
1202 | "default ERP in fastpath " | |
1203 | "(%i retries left)", | |
1204 | cqr->retries); | |
a4d26c6a SW |
1205 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) |
1206 | cqr->lpm = device->path_data.opm; | |
8e09f215 SW |
1207 | cqr->status = DASD_CQR_QUEUED; |
1208 | next = cqr; | |
1209 | } else | |
1da177e4 | 1210 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1211 | } |
1212 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1213 | (!device->stopped)) { | |
1214 | if (device->discipline->start_IO(next) == 0) | |
1215 | expires = next->expires; | |
1da177e4 LT |
1216 | } |
1217 | if (expires != 0) | |
8e09f215 | 1218 | dasd_device_set_timer(device, expires); |
1da177e4 | 1219 | else |
8e09f215 SW |
1220 | dasd_device_clear_timer(device); |
1221 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1222 | } |
1223 | ||
a23ed009 SH |
1224 | enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) |
1225 | { | |
1226 | struct dasd_device *device; | |
1227 | ||
1228 | device = dasd_device_from_cdev_locked(cdev); | |
1229 | ||
1230 | if (IS_ERR(device)) | |
1231 | goto out; | |
1232 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || | |
1233 | device->state != device->target || | |
5a27e60d | 1234 | !device->discipline->check_for_device_change){ |
a23ed009 SH |
1235 | dasd_put_device(device); |
1236 | goto out; | |
1237 | } | |
5a27e60d SW |
1238 | if (device->discipline->dump_sense_dbf) |
1239 | device->discipline->dump_sense_dbf(device, irb, "uc"); | |
1240 | device->discipline->check_for_device_change(device, NULL, irb); | |
a23ed009 SH |
1241 | dasd_put_device(device); |
1242 | out: | |
1243 | return UC_TODO_RETRY; | |
1244 | } | |
1245 | EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); | |
1246 | ||
1da177e4 | 1247 | /* |
8e09f215 SW |
1248 | * If we have an error on a dasd_block layer request then we cancel |
1249 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1250 | */ |
8e09f215 SW |
1251 | static void __dasd_device_recovery(struct dasd_device *device, |
1252 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1253 | { |
8e09f215 SW |
1254 | struct list_head *l, *n; |
1255 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1256 | |
8e09f215 SW |
1257 | /* |
1258 | * only requeue request that came from the dasd_block layer | |
1259 | */ | |
1260 | if (!ref_cqr->block) | |
1261 | return; | |
1da177e4 | 1262 | |
8e09f215 SW |
1263 | list_for_each_safe(l, n, &device->ccw_queue) { |
1264 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1265 | if (cqr->status == DASD_CQR_QUEUED && | |
1266 | ref_cqr->block == cqr->block) { | |
1267 | cqr->status = DASD_CQR_CLEARED; | |
1268 | } | |
1269 | } | |
1270 | }; | |
1da177e4 LT |
1271 | |
1272 | /* | |
8e09f215 SW |
1273 | * Remove those ccw requests from the queue that need to be returned |
1274 | * to the upper layer. | |
1da177e4 | 1275 | */ |
8e09f215 SW |
1276 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1277 | struct list_head *final_queue) | |
1da177e4 LT |
1278 | { |
1279 | struct list_head *l, *n; | |
1280 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1281 | |
1da177e4 LT |
1282 | /* Process request with final status. */ |
1283 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1284 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1285 | ||
1da177e4 | 1286 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1287 | if (cqr->status == DASD_CQR_QUEUED || |
1288 | cqr->status == DASD_CQR_IN_IO || | |
1289 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1290 | break; |
1da177e4 | 1291 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1292 | __dasd_device_recovery(device, cqr); |
20c64468 | 1293 | } |
1da177e4 | 1294 | /* Rechain finished requests to final queue */ |
8e09f215 | 1295 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1296 | } |
1297 | } | |
1298 | ||
1da177e4 | 1299 | /* |
8e09f215 SW |
1300 | * the cqrs from the final queue are returned to the upper layer |
1301 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1302 | */ |
8e09f215 SW |
1303 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1304 | struct list_head *final_queue) | |
1da177e4 | 1305 | { |
8e09f215 | 1306 | struct list_head *l, *n; |
1da177e4 | 1307 | struct dasd_ccw_req *cqr; |
03513bcc | 1308 | struct dasd_block *block; |
c80ee724 SH |
1309 | void (*callback)(struct dasd_ccw_req *, void *data); |
1310 | void *callback_data; | |
fc19f381 | 1311 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1312 | |
8e09f215 SW |
1313 | list_for_each_safe(l, n, final_queue) { |
1314 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1315 | list_del_init(&cqr->devlist); | |
03513bcc | 1316 | block = cqr->block; |
c80ee724 SH |
1317 | callback = cqr->callback; |
1318 | callback_data = cqr->callback_data; | |
03513bcc SW |
1319 | if (block) |
1320 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1321 | switch (cqr->status) { |
1322 | case DASD_CQR_SUCCESS: | |
1323 | cqr->status = DASD_CQR_DONE; | |
1324 | break; | |
1325 | case DASD_CQR_ERROR: | |
1326 | cqr->status = DASD_CQR_NEED_ERP; | |
1327 | break; | |
1328 | case DASD_CQR_CLEARED: | |
1329 | cqr->status = DASD_CQR_TERMINATED; | |
1330 | break; | |
1331 | default: | |
fc19f381 SH |
1332 | /* internal error 12 - wrong cqr status*/ |
1333 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1334 | dev_err(&device->cdev->dev, | |
1335 | "An error occurred in the DASD device driver, " | |
1336 | "reason=%s\n", errorstring); | |
8e09f215 | 1337 | BUG(); |
1da177e4 | 1338 | } |
8e09f215 | 1339 | if (cqr->callback != NULL) |
c80ee724 | 1340 | (callback)(cqr, callback_data); |
03513bcc SW |
1341 | if (block) |
1342 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1343 | } |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * Take a look at the first request on the ccw queue and check | |
1348 | * if it reached its expire time. If so, terminate the IO. | |
1349 | */ | |
8e09f215 | 1350 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1351 | { |
1352 | struct dasd_ccw_req *cqr; | |
1353 | ||
1354 | if (list_empty(&device->ccw_queue)) | |
1355 | return; | |
8e09f215 | 1356 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1357 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1358 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1359 | if (device->discipline->term_IO(cqr) != 0) { | |
1360 | /* Hmpf, try again in 5 sec */ | |
fc19f381 | 1361 | dev_err(&device->cdev->dev, |
625c94df | 1362 | "cqr %p timed out (%lus) but cannot be " |
fc19f381 SH |
1363 | "ended, retrying in 5 s\n", |
1364 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1365 | cqr->expires += 5*HZ; |
1366 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1367 | } else { |
fc19f381 | 1368 | dev_err(&device->cdev->dev, |
625c94df | 1369 | "cqr %p timed out (%lus), %i retries " |
fc19f381 SH |
1370 | "remaining\n", cqr, (cqr->expires/HZ), |
1371 | cqr->retries); | |
1da177e4 LT |
1372 | } |
1373 | } | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Take a look at the first request on the ccw queue and check | |
1378 | * if it needs to be started. | |
1379 | */ | |
8e09f215 | 1380 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1381 | { |
1382 | struct dasd_ccw_req *cqr; | |
1383 | int rc; | |
1384 | ||
1385 | if (list_empty(&device->ccw_queue)) | |
1386 | return; | |
8e09f215 | 1387 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1388 | if (cqr->status != DASD_CQR_QUEUED) |
1389 | return; | |
a4d26c6a SW |
1390 | /* when device is stopped, return request to previous layer |
1391 | * exception: only the disconnect or unresumed bits are set and the | |
1392 | * cqr is a path verification request | |
1393 | */ | |
1394 | if (device->stopped && | |
1395 | !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) | |
1396 | && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) { | |
1397 | cqr->intrc = -EAGAIN; | |
8e09f215 SW |
1398 | cqr->status = DASD_CQR_CLEARED; |
1399 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1400 | return; |
1c01b8a5 | 1401 | } |
25ee4cf8 PO |
1402 | |
1403 | rc = device->discipline->start_IO(cqr); | |
1404 | if (rc == 0) | |
8e09f215 | 1405 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1406 | else if (rc == -EACCES) { |
8e09f215 | 1407 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1408 | } else |
1409 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1410 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1411 | } |
1412 | ||
a4d26c6a SW |
1413 | static void __dasd_device_check_path_events(struct dasd_device *device) |
1414 | { | |
1415 | int rc; | |
1416 | ||
1417 | if (device->path_data.tbvpm) { | |
1418 | if (device->stopped & ~(DASD_STOPPED_DC_WAIT | | |
1419 | DASD_UNRESUMED_PM)) | |
1420 | return; | |
1421 | rc = device->discipline->verify_path( | |
1422 | device, device->path_data.tbvpm); | |
1423 | if (rc) | |
1424 | dasd_device_set_timer(device, 50); | |
1425 | else | |
1426 | device->path_data.tbvpm = 0; | |
1427 | } | |
1428 | }; | |
1429 | ||
1da177e4 | 1430 | /* |
8e09f215 SW |
1431 | * Go through all request on the dasd_device request queue, |
1432 | * terminate them on the cdev if necessary, and return them to the | |
1433 | * submitting layer via callback. | |
1434 | * Note: | |
1435 | * Make sure that all 'submitting layers' still exist when | |
1436 | * this function is called!. In other words, when 'device' is a base | |
1437 | * device then all block layer requests must have been removed before | |
1438 | * via dasd_flush_block_queue. | |
1da177e4 | 1439 | */ |
8e09f215 | 1440 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1441 | { |
8e09f215 SW |
1442 | struct dasd_ccw_req *cqr, *n; |
1443 | int rc; | |
1da177e4 | 1444 | struct list_head flush_queue; |
1da177e4 LT |
1445 | |
1446 | INIT_LIST_HEAD(&flush_queue); | |
1447 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1448 | rc = 0; |
8e09f215 | 1449 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1450 | /* Check status and move request to flush_queue */ |
1451 | switch (cqr->status) { | |
1452 | case DASD_CQR_IN_IO: | |
1453 | rc = device->discipline->term_IO(cqr); | |
1454 | if (rc) { | |
1455 | /* unable to terminate requeust */ | |
fc19f381 SH |
1456 | dev_err(&device->cdev->dev, |
1457 | "Flushing the DASD request queue " | |
1458 | "failed for request %p\n", cqr); | |
8f61701b HH |
1459 | /* stop flush processing */ |
1460 | goto finished; | |
1461 | } | |
1462 | break; | |
1463 | case DASD_CQR_QUEUED: | |
1da177e4 | 1464 | cqr->stopclk = get_clock(); |
8e09f215 | 1465 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1466 | break; |
8e09f215 | 1467 | default: /* no need to modify the others */ |
8f61701b HH |
1468 | break; |
1469 | } | |
8e09f215 | 1470 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1471 | } |
8f61701b HH |
1472 | finished: |
1473 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1474 | /* |
1475 | * After this point all requests must be in state CLEAR_PENDING, | |
1476 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1477 | * one of the others. | |
1478 | */ | |
1479 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1480 | wait_event(dasd_flush_wq, | |
1481 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1482 | /* | |
1483 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1484 | * and call the callback function of flushed requests | |
1485 | */ | |
1486 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1487 | return rc; |
1da177e4 LT |
1488 | } |
1489 | ||
1490 | /* | |
1491 | * Acquire the device lock and process queues for the device. | |
1492 | */ | |
8e09f215 | 1493 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1494 | { |
1495 | struct list_head final_queue; | |
1da177e4 LT |
1496 | |
1497 | atomic_set (&device->tasklet_scheduled, 0); | |
1498 | INIT_LIST_HEAD(&final_queue); | |
1499 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1500 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1501 | __dasd_device_check_expire(device); |
1502 | /* find final requests on ccw queue */ | |
1503 | __dasd_device_process_ccw_queue(device, &final_queue); | |
a4d26c6a | 1504 | __dasd_device_check_path_events(device); |
1da177e4 LT |
1505 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1506 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1507 | __dasd_device_process_final_queue(device, &final_queue); |
1508 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1509 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1510 | __dasd_device_start_head(device); |
1511 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1512 | dasd_put_device(device); |
1513 | } | |
1514 | ||
1515 | /* | |
1516 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1517 | */ | |
8e09f215 | 1518 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1519 | { |
1520 | /* Protect against rescheduling. */ | |
973bd993 | 1521 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1522 | return; |
1523 | dasd_get_device(device); | |
1524 | tasklet_hi_schedule(&device->tasklet); | |
1525 | } | |
1526 | ||
eb6e199b SW |
1527 | void dasd_device_set_stop_bits(struct dasd_device *device, int bits) |
1528 | { | |
1529 | device->stopped |= bits; | |
1530 | } | |
1531 | EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); | |
1532 | ||
1533 | void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) | |
1534 | { | |
1535 | device->stopped &= ~bits; | |
1536 | if (!device->stopped) | |
1537 | wake_up(&generic_waitq); | |
1538 | } | |
1539 | EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); | |
1540 | ||
1da177e4 | 1541 | /* |
8e09f215 SW |
1542 | * Queue a request to the head of the device ccw_queue. |
1543 | * Start the I/O if possible. | |
1da177e4 | 1544 | */ |
8e09f215 | 1545 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1546 | { |
1547 | struct dasd_device *device; | |
1548 | unsigned long flags; | |
1549 | ||
8e09f215 | 1550 | device = cqr->startdev; |
1da177e4 | 1551 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1552 | cqr->status = DASD_CQR_QUEUED; |
1553 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1554 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1555 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1556 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1557 | } | |
1558 | ||
1559 | /* | |
8e09f215 SW |
1560 | * Queue a request to the tail of the device ccw_queue. |
1561 | * Start the I/O if possible. | |
1da177e4 | 1562 | */ |
8e09f215 | 1563 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1564 | { |
1565 | struct dasd_device *device; | |
1566 | unsigned long flags; | |
1567 | ||
8e09f215 | 1568 | device = cqr->startdev; |
1da177e4 | 1569 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1570 | cqr->status = DASD_CQR_QUEUED; |
1571 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1572 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1573 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1574 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1575 | } | |
1576 | ||
1577 | /* | |
8e09f215 | 1578 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1579 | */ |
8e09f215 | 1580 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 | 1581 | { |
1c1e093c SW |
1582 | spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); |
1583 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
1584 | spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); | |
1585 | wake_up(&generic_waitq); | |
1da177e4 LT |
1586 | } |
1587 | ||
8e09f215 | 1588 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1589 | { |
1590 | struct dasd_device *device; | |
1591 | int rc; | |
1592 | ||
8e09f215 | 1593 | device = cqr->startdev; |
1da177e4 | 1594 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1c1e093c | 1595 | rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); |
1da177e4 LT |
1596 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1597 | return rc; | |
1598 | } | |
1599 | ||
1600 | /* | |
eb6e199b | 1601 | * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. |
1da177e4 | 1602 | */ |
eb6e199b | 1603 | static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) |
1da177e4 | 1604 | { |
1da177e4 | 1605 | struct dasd_device *device; |
eb6e199b | 1606 | dasd_erp_fn_t erp_fn; |
138c014d | 1607 | |
eb6e199b SW |
1608 | if (cqr->status == DASD_CQR_FILLED) |
1609 | return 0; | |
8e09f215 | 1610 | device = cqr->startdev; |
eb6e199b SW |
1611 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
1612 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1613 | device->discipline->handle_terminated_request(cqr); | |
1614 | return 1; | |
1615 | } | |
1616 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
1617 | erp_fn = device->discipline->erp_action(cqr); | |
1618 | erp_fn(cqr); | |
1619 | return 1; | |
1620 | } | |
1621 | if (cqr->status == DASD_CQR_FAILED) | |
1622 | dasd_log_sense(cqr, &cqr->irb); | |
1623 | if (cqr->refers) { | |
1624 | __dasd_process_erp(device, cqr); | |
1625 | return 1; | |
1626 | } | |
1627 | } | |
1628 | return 0; | |
1629 | } | |
138c014d | 1630 | |
eb6e199b SW |
1631 | static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) |
1632 | { | |
1633 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { | |
1634 | if (cqr->refers) /* erp is not done yet */ | |
1635 | return 1; | |
1636 | return ((cqr->status != DASD_CQR_DONE) && | |
1637 | (cqr->status != DASD_CQR_FAILED)); | |
1638 | } else | |
1639 | return (cqr->status == DASD_CQR_FILLED); | |
1640 | } | |
138c014d | 1641 | |
eb6e199b SW |
1642 | static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) |
1643 | { | |
1644 | struct dasd_device *device; | |
1645 | int rc; | |
1646 | struct list_head ccw_queue; | |
1647 | struct dasd_ccw_req *cqr; | |
1648 | ||
1649 | INIT_LIST_HEAD(&ccw_queue); | |
1650 | maincqr->status = DASD_CQR_FILLED; | |
1651 | device = maincqr->startdev; | |
1652 | list_add(&maincqr->blocklist, &ccw_queue); | |
1653 | for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); | |
1654 | cqr = list_first_entry(&ccw_queue, | |
1655 | struct dasd_ccw_req, blocklist)) { | |
1656 | ||
1657 | if (__dasd_sleep_on_erp(cqr)) | |
1658 | continue; | |
1659 | if (cqr->status != DASD_CQR_FILLED) /* could be failed */ | |
1660 | continue; | |
5a27e60d SW |
1661 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
1662 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
1663 | cqr->status = DASD_CQR_FAILED; | |
1664 | cqr->intrc = -EPERM; | |
1665 | continue; | |
1666 | } | |
eb6e199b SW |
1667 | /* Non-temporary stop condition will trigger fail fast */ |
1668 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
1669 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1670 | (!dasd_eer_enabled(device))) { | |
1671 | cqr->status = DASD_CQR_FAILED; | |
1672 | continue; | |
1673 | } | |
eb6e199b SW |
1674 | /* Don't try to start requests if device is stopped */ |
1675 | if (interruptible) { | |
1676 | rc = wait_event_interruptible( | |
1677 | generic_waitq, !(device->stopped)); | |
1678 | if (rc == -ERESTARTSYS) { | |
1679 | cqr->status = DASD_CQR_FAILED; | |
1680 | maincqr->intrc = rc; | |
1681 | continue; | |
1682 | } | |
1683 | } else | |
1684 | wait_event(generic_waitq, !(device->stopped)); | |
1685 | ||
1686 | cqr->callback = dasd_wakeup_cb; | |
1c1e093c | 1687 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
eb6e199b SW |
1688 | dasd_add_request_tail(cqr); |
1689 | if (interruptible) { | |
1690 | rc = wait_event_interruptible( | |
1691 | generic_waitq, _wait_for_wakeup(cqr)); | |
1692 | if (rc == -ERESTARTSYS) { | |
1693 | dasd_cancel_req(cqr); | |
1694 | /* wait (non-interruptible) for final status */ | |
1695 | wait_event(generic_waitq, | |
1696 | _wait_for_wakeup(cqr)); | |
1697 | cqr->status = DASD_CQR_FAILED; | |
1698 | maincqr->intrc = rc; | |
1699 | continue; | |
1700 | } | |
1701 | } else | |
1702 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); | |
1703 | } | |
1704 | ||
1705 | maincqr->endclk = get_clock(); | |
1706 | if ((maincqr->status != DASD_CQR_DONE) && | |
1707 | (maincqr->intrc != -ERESTARTSYS)) | |
1708 | dasd_log_sense(maincqr, &maincqr->irb); | |
1709 | if (maincqr->status == DASD_CQR_DONE) | |
6cc7f168 | 1710 | rc = 0; |
eb6e199b SW |
1711 | else if (maincqr->intrc) |
1712 | rc = maincqr->intrc; | |
6cc7f168 SW |
1713 | else |
1714 | rc = -EIO; | |
1da177e4 LT |
1715 | return rc; |
1716 | } | |
1717 | ||
eb6e199b SW |
1718 | /* |
1719 | * Queue a request to the tail of the device ccw_queue and wait for | |
1720 | * it's completion. | |
1721 | */ | |
1722 | int dasd_sleep_on(struct dasd_ccw_req *cqr) | |
1723 | { | |
1724 | return _dasd_sleep_on(cqr, 0); | |
1725 | } | |
1726 | ||
1da177e4 | 1727 | /* |
8e09f215 SW |
1728 | * Queue a request to the tail of the device ccw_queue and wait |
1729 | * interruptible for it's completion. | |
1da177e4 | 1730 | */ |
8e09f215 | 1731 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1732 | { |
eb6e199b | 1733 | return _dasd_sleep_on(cqr, 1); |
1da177e4 LT |
1734 | } |
1735 | ||
1736 | /* | |
1737 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1738 | * for eckd devices) the currently running request has to be terminated | |
1739 | * and be put back to status queued, before the special request is added | |
1740 | * to the head of the queue. Then the special request is waited on normally. | |
1741 | */ | |
8e09f215 | 1742 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1743 | { |
1744 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1745 | |
1746 | if (list_empty(&device->ccw_queue)) | |
1747 | return 0; | |
8e09f215 | 1748 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1749 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1750 | } |
1751 | ||
8e09f215 | 1752 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1753 | { |
1da177e4 LT |
1754 | struct dasd_device *device; |
1755 | int rc; | |
138c014d | 1756 | |
8e09f215 | 1757 | device = cqr->startdev; |
5a27e60d SW |
1758 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
1759 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
1760 | cqr->status = DASD_CQR_FAILED; | |
1761 | cqr->intrc = -EPERM; | |
1762 | return -EIO; | |
1763 | } | |
1da177e4 LT |
1764 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1765 | rc = _dasd_term_running_cqr(device); | |
1766 | if (rc) { | |
1767 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1768 | return rc; | |
1769 | } | |
1da177e4 | 1770 | cqr->callback = dasd_wakeup_cb; |
1c1e093c | 1771 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
1da177e4 | 1772 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1773 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1774 | |
1da177e4 | 1775 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1776 | dasd_schedule_device_bh(device); |
138c014d | 1777 | |
1da177e4 LT |
1778 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1779 | ||
c80ee724 | 1780 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1781 | |
6cc7f168 SW |
1782 | if (cqr->status == DASD_CQR_DONE) |
1783 | rc = 0; | |
1784 | else if (cqr->intrc) | |
1785 | rc = cqr->intrc; | |
1786 | else | |
1787 | rc = -EIO; | |
1da177e4 LT |
1788 | return rc; |
1789 | } | |
1790 | ||
1791 | /* | |
1792 | * Cancels a request that was started with dasd_sleep_on_req. | |
1793 | * This is useful to timeout requests. The request will be | |
1794 | * terminated if it is currently in i/o. | |
1795 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1796 | * 0 if there was no need to terminate the request (not started yet) |
1797 | * negative error code if termination failed | |
1798 | * Cancellation of a request is an asynchronous operation! The calling | |
1799 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1800 | */ |
8e09f215 | 1801 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1802 | { |
8e09f215 | 1803 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1804 | unsigned long flags; |
1805 | int rc; | |
1806 | ||
1807 | rc = 0; | |
1808 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1809 | switch (cqr->status) { | |
1810 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1811 | /* request was not started - just set to cleared */ |
1812 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1813 | break; |
1814 | case DASD_CQR_IN_IO: | |
1815 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1816 | rc = device->discipline->term_IO(cqr); |
1817 | if (rc) { | |
fc19f381 SH |
1818 | dev_err(&device->cdev->dev, |
1819 | "Cancelling request %p failed with rc=%d\n", | |
1820 | cqr, rc); | |
8e09f215 SW |
1821 | } else { |
1822 | cqr->stopclk = get_clock(); | |
8e09f215 | 1823 | } |
1da177e4 | 1824 | break; |
8e09f215 | 1825 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1826 | break; |
8e09f215 SW |
1827 | } |
1828 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1829 | dasd_schedule_device_bh(device); | |
1830 | return rc; | |
1831 | } | |
1832 | ||
1833 | ||
1834 | /* | |
1835 | * SECTION: Operations of the dasd_block layer. | |
1836 | */ | |
1837 | ||
1838 | /* | |
1839 | * Timeout function for dasd_block. This is used when the block layer | |
1840 | * is waiting for something that may not come reliably, (e.g. a state | |
1841 | * change interrupt) | |
1842 | */ | |
1843 | static void dasd_block_timeout(unsigned long ptr) | |
1844 | { | |
1845 | unsigned long flags; | |
1846 | struct dasd_block *block; | |
1847 | ||
1848 | block = (struct dasd_block *) ptr; | |
1849 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1850 | /* re-activate request queue */ | |
eb6e199b | 1851 | dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); |
8e09f215 SW |
1852 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
1853 | dasd_schedule_block_bh(block); | |
1854 | } | |
1855 | ||
1856 | /* | |
1857 | * Setup timeout for a dasd_block in jiffies. | |
1858 | */ | |
1859 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1860 | { | |
48cae885 SW |
1861 | if (expires == 0) |
1862 | del_timer(&block->timer); | |
1863 | else | |
1864 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 SW |
1865 | } |
1866 | ||
1867 | /* | |
1868 | * Clear timeout for a dasd_block. | |
1869 | */ | |
1870 | void dasd_block_clear_timer(struct dasd_block *block) | |
1871 | { | |
48cae885 | 1872 | del_timer(&block->timer); |
8e09f215 SW |
1873 | } |
1874 | ||
8e09f215 SW |
1875 | /* |
1876 | * Process finished error recovery ccw. | |
1877 | */ | |
eb6e199b SW |
1878 | static void __dasd_process_erp(struct dasd_device *device, |
1879 | struct dasd_ccw_req *cqr) | |
8e09f215 SW |
1880 | { |
1881 | dasd_erp_fn_t erp_fn; | |
8e09f215 SW |
1882 | |
1883 | if (cqr->status == DASD_CQR_DONE) | |
1884 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1885 | else | |
fc19f381 | 1886 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
1887 | erp_fn = device->discipline->erp_postaction(cqr); |
1888 | erp_fn(cqr); | |
1889 | } | |
1da177e4 | 1890 | |
8e09f215 SW |
1891 | /* |
1892 | * Fetch requests from the block device queue. | |
1893 | */ | |
1894 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1895 | { | |
1896 | struct request_queue *queue; | |
1897 | struct request *req; | |
1898 | struct dasd_ccw_req *cqr; | |
1899 | struct dasd_device *basedev; | |
1900 | unsigned long flags; | |
1901 | queue = block->request_queue; | |
1902 | basedev = block->base; | |
1903 | /* No queue ? Then there is nothing to do. */ | |
1904 | if (queue == NULL) | |
1905 | return; | |
1906 | ||
1907 | /* | |
1908 | * We requeue request from the block device queue to the ccw | |
1909 | * queue only in two states. In state DASD_STATE_READY the | |
1910 | * partition detection is done and we need to requeue requests | |
1911 | * for that. State DASD_STATE_ONLINE is normal block device | |
1912 | * operation. | |
1913 | */ | |
97f604b0 SW |
1914 | if (basedev->state < DASD_STATE_READY) { |
1915 | while ((req = blk_fetch_request(block->request_queue))) | |
1916 | __blk_end_request_all(req, -EIO); | |
8e09f215 | 1917 | return; |
97f604b0 | 1918 | } |
8e09f215 | 1919 | /* Now we try to fetch requests from the request queue */ |
9934c8c0 | 1920 | while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) { |
8e09f215 SW |
1921 | if (basedev->features & DASD_FEATURE_READONLY && |
1922 | rq_data_dir(req) == WRITE) { | |
1923 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1924 | "Rejecting write request %p", | |
1925 | req); | |
9934c8c0 | 1926 | blk_start_request(req); |
40cbbb78 | 1927 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1928 | continue; |
1929 | } | |
1930 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1931 | if (IS_ERR(cqr)) { | |
1932 | if (PTR_ERR(cqr) == -EBUSY) | |
1933 | break; /* normal end condition */ | |
1934 | if (PTR_ERR(cqr) == -ENOMEM) | |
1935 | break; /* terminate request queue loop */ | |
1936 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1937 | /* | |
1938 | * The current request cannot be build right | |
1939 | * now, we have to try later. If this request | |
1940 | * is the head-of-queue we stop the device | |
1941 | * for 1/2 second. | |
1942 | */ | |
1943 | if (!list_empty(&block->ccw_queue)) | |
1944 | break; | |
eb6e199b SW |
1945 | spin_lock_irqsave( |
1946 | get_ccwdev_lock(basedev->cdev), flags); | |
1947 | dasd_device_set_stop_bits(basedev, | |
1948 | DASD_STOPPED_PENDING); | |
1949 | spin_unlock_irqrestore( | |
1950 | get_ccwdev_lock(basedev->cdev), flags); | |
8e09f215 SW |
1951 | dasd_block_set_timer(block, HZ/2); |
1952 | break; | |
1953 | } | |
1954 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1955 | "CCW creation failed (rc=%ld) " | |
1956 | "on request %p", | |
1957 | PTR_ERR(cqr), req); | |
9934c8c0 | 1958 | blk_start_request(req); |
40cbbb78 | 1959 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1960 | continue; |
1961 | } | |
1962 | /* | |
1963 | * Note: callback is set to dasd_return_cqr_cb in | |
1964 | * __dasd_block_start_head to cover erp requests as well | |
1965 | */ | |
1966 | cqr->callback_data = (void *) req; | |
1967 | cqr->status = DASD_CQR_FILLED; | |
9934c8c0 | 1968 | blk_start_request(req); |
8e09f215 SW |
1969 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
1970 | dasd_profile_start(block, cqr, req); | |
1971 | } | |
1972 | } | |
1973 | ||
1974 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1975 | { | |
1976 | struct request *req; | |
1977 | int status; | |
4c4e2148 | 1978 | int error = 0; |
8e09f215 SW |
1979 | |
1980 | req = (struct request *) cqr->callback_data; | |
1981 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1982 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1983 | if (status <= 0) |
1984 | error = status ? status : -EIO; | |
40cbbb78 | 1985 | __blk_end_request_all(req, error); |
8e09f215 SW |
1986 | } |
1987 | ||
1988 | /* | |
1989 | * Process ccw request queue. | |
1990 | */ | |
1991 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1992 | struct list_head *final_queue) | |
1993 | { | |
1994 | struct list_head *l, *n; | |
1995 | struct dasd_ccw_req *cqr; | |
1996 | dasd_erp_fn_t erp_fn; | |
1997 | unsigned long flags; | |
1998 | struct dasd_device *base = block->base; | |
1999 | ||
2000 | restart: | |
2001 | /* Process request with final status. */ | |
2002 | list_for_each_safe(l, n, &block->ccw_queue) { | |
2003 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2004 | if (cqr->status != DASD_CQR_DONE && | |
2005 | cqr->status != DASD_CQR_FAILED && | |
2006 | cqr->status != DASD_CQR_NEED_ERP && | |
2007 | cqr->status != DASD_CQR_TERMINATED) | |
2008 | continue; | |
2009 | ||
2010 | if (cqr->status == DASD_CQR_TERMINATED) { | |
2011 | base->discipline->handle_terminated_request(cqr); | |
2012 | goto restart; | |
2013 | } | |
2014 | ||
2015 | /* Process requests that may be recovered */ | |
2016 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 | 2017 | erp_fn = base->discipline->erp_action(cqr); |
6a5176c4 SH |
2018 | if (IS_ERR(erp_fn(cqr))) |
2019 | continue; | |
8e09f215 SW |
2020 | goto restart; |
2021 | } | |
2022 | ||
a9cffb22 SH |
2023 | /* log sense for fatal error */ |
2024 | if (cqr->status == DASD_CQR_FAILED) { | |
2025 | dasd_log_sense(cqr, &cqr->irb); | |
2026 | } | |
2027 | ||
8e09f215 SW |
2028 | /* First of all call extended error reporting. */ |
2029 | if (dasd_eer_enabled(base) && | |
2030 | cqr->status == DASD_CQR_FAILED) { | |
2031 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
2032 | ||
2033 | /* restart request */ | |
2034 | cqr->status = DASD_CQR_FILLED; | |
2035 | cqr->retries = 255; | |
2036 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
eb6e199b | 2037 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 SW |
2038 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
2039 | flags); | |
2040 | goto restart; | |
2041 | } | |
2042 | ||
2043 | /* Process finished ERP request. */ | |
2044 | if (cqr->refers) { | |
eb6e199b | 2045 | __dasd_process_erp(base, cqr); |
8e09f215 SW |
2046 | goto restart; |
2047 | } | |
2048 | ||
2049 | /* Rechain finished requests to final queue */ | |
2050 | cqr->endclk = get_clock(); | |
2051 | list_move_tail(&cqr->blocklist, final_queue); | |
2052 | } | |
2053 | } | |
2054 | ||
2055 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
2056 | { | |
2057 | dasd_schedule_block_bh(cqr->block); | |
2058 | } | |
2059 | ||
2060 | static void __dasd_block_start_head(struct dasd_block *block) | |
2061 | { | |
2062 | struct dasd_ccw_req *cqr; | |
2063 | ||
2064 | if (list_empty(&block->ccw_queue)) | |
2065 | return; | |
2066 | /* We allways begin with the first requests on the queue, as some | |
2067 | * of previously started requests have to be enqueued on a | |
2068 | * dasd_device again for error recovery. | |
2069 | */ | |
2070 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
2071 | if (cqr->status != DASD_CQR_FILLED) | |
2072 | continue; | |
5a27e60d SW |
2073 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && |
2074 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2075 | cqr->status = DASD_CQR_FAILED; | |
2076 | cqr->intrc = -EPERM; | |
2077 | dasd_schedule_block_bh(block); | |
2078 | continue; | |
2079 | } | |
8e09f215 SW |
2080 | /* Non-temporary stop condition will trigger fail fast */ |
2081 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
2082 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2083 | (!dasd_eer_enabled(block->base))) { | |
2084 | cqr->status = DASD_CQR_FAILED; | |
2085 | dasd_schedule_block_bh(block); | |
2086 | continue; | |
2087 | } | |
2088 | /* Don't try to start requests if device is stopped */ | |
2089 | if (block->base->stopped) | |
2090 | return; | |
2091 | ||
2092 | /* just a fail safe check, should not happen */ | |
2093 | if (!cqr->startdev) | |
2094 | cqr->startdev = block->base; | |
2095 | ||
2096 | /* make sure that the requests we submit find their way back */ | |
2097 | cqr->callback = dasd_return_cqr_cb; | |
2098 | ||
2099 | dasd_add_request_tail(cqr); | |
2100 | } | |
2101 | } | |
2102 | ||
2103 | /* | |
2104 | * Central dasd_block layer routine. Takes requests from the generic | |
2105 | * block layer request queue, creates ccw requests, enqueues them on | |
2106 | * a dasd_device and processes ccw requests that have been returned. | |
2107 | */ | |
2108 | static void dasd_block_tasklet(struct dasd_block *block) | |
2109 | { | |
2110 | struct list_head final_queue; | |
2111 | struct list_head *l, *n; | |
2112 | struct dasd_ccw_req *cqr; | |
2113 | ||
2114 | atomic_set(&block->tasklet_scheduled, 0); | |
2115 | INIT_LIST_HEAD(&final_queue); | |
2116 | spin_lock(&block->queue_lock); | |
2117 | /* Finish off requests on ccw queue */ | |
2118 | __dasd_process_block_ccw_queue(block, &final_queue); | |
2119 | spin_unlock(&block->queue_lock); | |
2120 | /* Now call the callback function of requests with final status */ | |
2121 | spin_lock_irq(&block->request_queue_lock); | |
2122 | list_for_each_safe(l, n, &final_queue) { | |
2123 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2124 | list_del_init(&cqr->blocklist); | |
2125 | __dasd_cleanup_cqr(cqr); | |
2126 | } | |
2127 | spin_lock(&block->queue_lock); | |
2128 | /* Get new request from the block device request queue */ | |
2129 | __dasd_process_request_queue(block); | |
2130 | /* Now check if the head of the ccw queue needs to be started. */ | |
2131 | __dasd_block_start_head(block); | |
2132 | spin_unlock(&block->queue_lock); | |
2133 | spin_unlock_irq(&block->request_queue_lock); | |
2134 | dasd_put_device(block->base); | |
2135 | } | |
2136 | ||
2137 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
2138 | { | |
2139 | wake_up(&dasd_flush_wq); | |
2140 | } | |
2141 | ||
2142 | /* | |
2143 | * Go through all request on the dasd_block request queue, cancel them | |
2144 | * on the respective dasd_device, and return them to the generic | |
2145 | * block layer. | |
2146 | */ | |
2147 | static int dasd_flush_block_queue(struct dasd_block *block) | |
2148 | { | |
2149 | struct dasd_ccw_req *cqr, *n; | |
2150 | int rc, i; | |
2151 | struct list_head flush_queue; | |
2152 | ||
2153 | INIT_LIST_HEAD(&flush_queue); | |
2154 | spin_lock_bh(&block->queue_lock); | |
2155 | rc = 0; | |
2156 | restart: | |
2157 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
2158 | /* if this request currently owned by a dasd_device cancel it */ | |
2159 | if (cqr->status >= DASD_CQR_QUEUED) | |
2160 | rc = dasd_cancel_req(cqr); | |
2161 | if (rc < 0) | |
2162 | break; | |
2163 | /* Rechain request (including erp chain) so it won't be | |
2164 | * touched by the dasd_block_tasklet anymore. | |
2165 | * Replace the callback so we notice when the request | |
2166 | * is returned from the dasd_device layer. | |
2167 | */ | |
2168 | cqr->callback = _dasd_wake_block_flush_cb; | |
2169 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
2170 | list_move_tail(&cqr->blocklist, &flush_queue); | |
2171 | if (i > 1) | |
2172 | /* moved more than one request - need to restart */ | |
2173 | goto restart; | |
2174 | } | |
2175 | spin_unlock_bh(&block->queue_lock); | |
2176 | /* Now call the callback function of flushed requests */ | |
2177 | restart_cb: | |
2178 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
2179 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
2180 | /* Process finished ERP request. */ | |
2181 | if (cqr->refers) { | |
0cd4bd47 | 2182 | spin_lock_bh(&block->queue_lock); |
eb6e199b | 2183 | __dasd_process_erp(block->base, cqr); |
0cd4bd47 | 2184 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
2185 | /* restart list_for_xx loop since dasd_process_erp |
2186 | * might remove multiple elements */ | |
2187 | goto restart_cb; | |
2188 | } | |
2189 | /* call the callback function */ | |
0cd4bd47 | 2190 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
2191 | cqr->endclk = get_clock(); |
2192 | list_del_init(&cqr->blocklist); | |
2193 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 2194 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 2195 | } |
1da177e4 LT |
2196 | return rc; |
2197 | } | |
2198 | ||
2199 | /* | |
8e09f215 SW |
2200 | * Schedules a call to dasd_tasklet over the device tasklet. |
2201 | */ | |
2202 | void dasd_schedule_block_bh(struct dasd_block *block) | |
2203 | { | |
2204 | /* Protect against rescheduling. */ | |
2205 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
2206 | return; | |
2207 | /* life cycle of block is bound to it's base device */ | |
2208 | dasd_get_device(block->base); | |
2209 | tasklet_hi_schedule(&block->tasklet); | |
2210 | } | |
2211 | ||
2212 | ||
2213 | /* | |
2214 | * SECTION: external block device operations | |
2215 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
2216 | */ |
2217 | ||
2218 | /* | |
2219 | * Dasd request queue function. Called from ll_rw_blk.c | |
2220 | */ | |
8e09f215 | 2221 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 2222 | { |
8e09f215 | 2223 | struct dasd_block *block; |
1da177e4 | 2224 | |
8e09f215 SW |
2225 | block = queue->queuedata; |
2226 | spin_lock(&block->queue_lock); | |
1da177e4 | 2227 | /* Get new request from the block device request queue */ |
8e09f215 | 2228 | __dasd_process_request_queue(block); |
1da177e4 | 2229 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2230 | __dasd_block_start_head(block); |
2231 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
2232 | } |
2233 | ||
2234 | /* | |
2235 | * Allocate and initialize request queue and default I/O scheduler. | |
2236 | */ | |
8e09f215 | 2237 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
2238 | { |
2239 | int rc; | |
2240 | ||
8e09f215 SW |
2241 | block->request_queue = blk_init_queue(do_dasd_request, |
2242 | &block->request_queue_lock); | |
2243 | if (block->request_queue == NULL) | |
1da177e4 LT |
2244 | return -ENOMEM; |
2245 | ||
8e09f215 | 2246 | block->request_queue->queuedata = block; |
1da177e4 | 2247 | |
8e09f215 | 2248 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 2249 | block->request_queue->elevator = NULL; |
8e09f215 | 2250 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 2251 | if (rc) { |
8e09f215 | 2252 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
2253 | return rc; |
2254 | } | |
2255 | return 0; | |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * Allocate and initialize request queue. | |
2260 | */ | |
8e09f215 | 2261 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
2262 | { |
2263 | int max; | |
2264 | ||
e4dbb0f2 SH |
2265 | if (block->base->features & DASD_FEATURE_USERAW) { |
2266 | /* | |
2267 | * the max_blocks value for raw_track access is 256 | |
2268 | * it is higher than the native ECKD value because we | |
2269 | * only need one ccw per track | |
2270 | * so the max_hw_sectors are | |
2271 | * 2048 x 512B = 1024kB = 16 tracks | |
2272 | */ | |
2273 | max = 2048; | |
2274 | } else { | |
2275 | max = block->base->discipline->max_blocks << block->s2b_shift; | |
2276 | } | |
2277 | blk_queue_logical_block_size(block->request_queue, | |
2278 | block->bp_block); | |
086fa5ff | 2279 | blk_queue_max_hw_sectors(block->request_queue, max); |
8a78362c | 2280 | blk_queue_max_segments(block->request_queue, -1L); |
f3eb5384 SW |
2281 | /* with page sized segments we can translate each segement into |
2282 | * one idaw/tidaw | |
2283 | */ | |
2284 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
2285 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
1da177e4 LT |
2286 | } |
2287 | ||
2288 | /* | |
2289 | * Deactivate and free request queue. | |
2290 | */ | |
8e09f215 | 2291 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2292 | { |
8e09f215 SW |
2293 | if (block->request_queue) { |
2294 | blk_cleanup_queue(block->request_queue); | |
2295 | block->request_queue = NULL; | |
1da177e4 LT |
2296 | } |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Flush request on the request queue. | |
2301 | */ | |
8e09f215 | 2302 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2303 | { |
2304 | struct request *req; | |
2305 | ||
8e09f215 | 2306 | if (!block->request_queue) |
1da177e4 | 2307 | return; |
138c014d | 2308 | |
8e09f215 | 2309 | spin_lock_irq(&block->request_queue_lock); |
9934c8c0 | 2310 | while ((req = blk_fetch_request(block->request_queue))) |
40cbbb78 | 2311 | __blk_end_request_all(req, -EIO); |
8e09f215 | 2312 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2313 | } |
2314 | ||
57a7c0bc | 2315 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2316 | { |
57a7c0bc | 2317 | struct dasd_block *block = bdev->bd_disk->private_data; |
9eb25122 | 2318 | struct dasd_device *base; |
1da177e4 LT |
2319 | int rc; |
2320 | ||
9eb25122 SH |
2321 | if (!block) |
2322 | return -ENODEV; | |
2323 | ||
2324 | base = block->base; | |
8e09f215 SW |
2325 | atomic_inc(&block->open_count); |
2326 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2327 | rc = -ENODEV; |
2328 | goto unlock; | |
2329 | } | |
2330 | ||
8e09f215 | 2331 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2332 | rc = -EINVAL; |
2333 | goto unlock; | |
2334 | } | |
2335 | ||
2336 | if (dasd_probeonly) { | |
fc19f381 SH |
2337 | dev_info(&base->cdev->dev, |
2338 | "Accessing the DASD failed because it is in " | |
2339 | "probeonly mode\n"); | |
1da177e4 LT |
2340 | rc = -EPERM; |
2341 | goto out; | |
2342 | } | |
2343 | ||
8e09f215 SW |
2344 | if (base->state <= DASD_STATE_BASIC) { |
2345 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2346 | " Cannot open unrecognized device"); |
2347 | rc = -ENODEV; | |
2348 | goto out; | |
2349 | } | |
2350 | ||
33b62a30 SW |
2351 | if ((mode & FMODE_WRITE) && |
2352 | (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || | |
2353 | (base->features & DASD_FEATURE_READONLY))) { | |
2354 | rc = -EROFS; | |
2355 | goto out; | |
2356 | } | |
2357 | ||
1da177e4 LT |
2358 | return 0; |
2359 | ||
2360 | out: | |
8e09f215 | 2361 | module_put(base->discipline->owner); |
1da177e4 | 2362 | unlock: |
8e09f215 | 2363 | atomic_dec(&block->open_count); |
1da177e4 LT |
2364 | return rc; |
2365 | } | |
2366 | ||
57a7c0bc | 2367 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2368 | { |
8e09f215 | 2369 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2370 | |
8e09f215 SW |
2371 | atomic_dec(&block->open_count); |
2372 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2373 | return 0; |
2374 | } | |
2375 | ||
a885c8c4 CH |
2376 | /* |
2377 | * Return disk geometry. | |
2378 | */ | |
8e09f215 | 2379 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2380 | { |
8e09f215 SW |
2381 | struct dasd_block *block; |
2382 | struct dasd_device *base; | |
a885c8c4 | 2383 | |
8e09f215 | 2384 | block = bdev->bd_disk->private_data; |
8e09f215 | 2385 | if (!block) |
a885c8c4 | 2386 | return -ENODEV; |
cf05b824 | 2387 | base = block->base; |
a885c8c4 | 2388 | |
8e09f215 SW |
2389 | if (!base->discipline || |
2390 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2391 | return -EINVAL; |
2392 | ||
8e09f215 SW |
2393 | base->discipline->fill_geometry(block, geo); |
2394 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2395 | return 0; |
2396 | } | |
2397 | ||
83d5cde4 | 2398 | const struct block_device_operations |
1da177e4 LT |
2399 | dasd_device_operations = { |
2400 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2401 | .open = dasd_open, |
2402 | .release = dasd_release, | |
0000d031 HC |
2403 | .ioctl = dasd_ioctl, |
2404 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 2405 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2406 | }; |
2407 | ||
8e09f215 SW |
2408 | /******************************************************************************* |
2409 | * end of block device operations | |
2410 | */ | |
1da177e4 LT |
2411 | |
2412 | static void | |
2413 | dasd_exit(void) | |
2414 | { | |
2415 | #ifdef CONFIG_PROC_FS | |
2416 | dasd_proc_exit(); | |
2417 | #endif | |
20c64468 | 2418 | dasd_eer_exit(); |
6bb0e010 HH |
2419 | if (dasd_page_cache != NULL) { |
2420 | kmem_cache_destroy(dasd_page_cache); | |
2421 | dasd_page_cache = NULL; | |
2422 | } | |
1da177e4 LT |
2423 | dasd_gendisk_exit(); |
2424 | dasd_devmap_exit(); | |
1da177e4 LT |
2425 | if (dasd_debug_area != NULL) { |
2426 | debug_unregister(dasd_debug_area); | |
2427 | dasd_debug_area = NULL; | |
2428 | } | |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * SECTION: common functions for ccw_driver use | |
2433 | */ | |
2434 | ||
33b62a30 SW |
2435 | /* |
2436 | * Is the device read-only? | |
2437 | * Note that this function does not report the setting of the | |
2438 | * readonly device attribute, but how it is configured in z/VM. | |
2439 | */ | |
2440 | int dasd_device_is_ro(struct dasd_device *device) | |
2441 | { | |
2442 | struct ccw_dev_id dev_id; | |
2443 | struct diag210 diag_data; | |
2444 | int rc; | |
2445 | ||
2446 | if (!MACHINE_IS_VM) | |
2447 | return 0; | |
2448 | ccw_device_get_id(device->cdev, &dev_id); | |
2449 | memset(&diag_data, 0, sizeof(diag_data)); | |
2450 | diag_data.vrdcdvno = dev_id.devno; | |
2451 | diag_data.vrdclen = sizeof(diag_data); | |
2452 | rc = diag210(&diag_data); | |
2453 | if (rc == 0 || rc == 2) { | |
2454 | return diag_data.vrdcvfla & 0x80; | |
2455 | } else { | |
2456 | DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", | |
2457 | dev_id.devno, rc); | |
2458 | return 0; | |
2459 | } | |
2460 | } | |
2461 | EXPORT_SYMBOL_GPL(dasd_device_is_ro); | |
2462 | ||
f3445a1a CH |
2463 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
2464 | { | |
2465 | struct ccw_device *cdev = data; | |
2466 | int ret; | |
2467 | ||
2468 | ret = ccw_device_set_online(cdev); | |
2469 | if (ret) | |
2470 | pr_warning("%s: Setting the DASD online failed with rc=%d\n", | |
2471 | dev_name(&cdev->dev), ret); | |
f3445a1a CH |
2472 | } |
2473 | ||
1c01b8a5 HH |
2474 | /* |
2475 | * Initial attempt at a probe function. this can be simplified once | |
2476 | * the other detection code is gone. | |
2477 | */ | |
8e09f215 SW |
2478 | int dasd_generic_probe(struct ccw_device *cdev, |
2479 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2480 | { |
2481 | int ret; | |
2482 | ||
2483 | ret = dasd_add_sysfs_files(cdev); | |
2484 | if (ret) { | |
b8ed5dd5 SH |
2485 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", |
2486 | "dasd_generic_probe: could not add " | |
2487 | "sysfs entries"); | |
40545573 | 2488 | return ret; |
1da177e4 | 2489 | } |
40545573 | 2490 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2491 | |
40545573 HH |
2492 | /* |
2493 | * Automatically online either all dasd devices (dasd_autodetect) | |
2494 | * or all devices specified with dasd= parameters during | |
2495 | * initial probe. | |
2496 | */ | |
2497 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2498 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 2499 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 2500 | return 0; |
1da177e4 LT |
2501 | } |
2502 | ||
1c01b8a5 HH |
2503 | /* |
2504 | * This will one day be called from a global not_oper handler. | |
2505 | * It is also used by driver_unregister during module unload. | |
2506 | */ | |
8e09f215 | 2507 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2508 | { |
2509 | struct dasd_device *device; | |
8e09f215 | 2510 | struct dasd_block *block; |
1da177e4 | 2511 | |
59afda78 HH |
2512 | cdev->handler = NULL; |
2513 | ||
1da177e4 LT |
2514 | dasd_remove_sysfs_files(cdev); |
2515 | device = dasd_device_from_cdev(cdev); | |
2516 | if (IS_ERR(device)) | |
2517 | return; | |
2518 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2519 | /* Already doing offline processing */ | |
2520 | dasd_put_device(device); | |
2521 | return; | |
2522 | } | |
2523 | /* | |
2524 | * This device is removed unconditionally. Set offline | |
2525 | * flag to prevent dasd_open from opening it while it is | |
2526 | * no quite down yet. | |
2527 | */ | |
2528 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2529 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2530 | block = device->block; |
2531 | device->block = NULL; | |
1da177e4 | 2532 | dasd_delete_device(device); |
8e09f215 SW |
2533 | /* |
2534 | * life cycle of block is bound to device, so delete it after | |
2535 | * device was safely removed | |
2536 | */ | |
2537 | if (block) | |
2538 | dasd_free_block(block); | |
1da177e4 LT |
2539 | } |
2540 | ||
1c01b8a5 HH |
2541 | /* |
2542 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2543 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2544 | * or the user has started activation through sysfs. |
2545 | */ | |
8e09f215 SW |
2546 | int dasd_generic_set_online(struct ccw_device *cdev, |
2547 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2548 | { |
aa88861f | 2549 | struct dasd_discipline *discipline; |
1da177e4 | 2550 | struct dasd_device *device; |
c6eb7b77 | 2551 | int rc; |
f24acd45 | 2552 | |
40545573 HH |
2553 | /* first online clears initial online feature flag */ |
2554 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2555 | device = dasd_create_device(cdev); |
2556 | if (IS_ERR(device)) | |
2557 | return PTR_ERR(device); | |
2558 | ||
aa88861f | 2559 | discipline = base_discipline; |
c6eb7b77 | 2560 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 2561 | if (!dasd_diag_discipline_pointer) { |
fc19f381 SH |
2562 | pr_warning("%s Setting the DASD online failed because " |
2563 | "of missing DIAG discipline\n", | |
2564 | dev_name(&cdev->dev)); | |
1da177e4 LT |
2565 | dasd_delete_device(device); |
2566 | return -ENODEV; | |
2567 | } | |
2568 | discipline = dasd_diag_discipline_pointer; | |
2569 | } | |
aa88861f PO |
2570 | if (!try_module_get(base_discipline->owner)) { |
2571 | dasd_delete_device(device); | |
2572 | return -EINVAL; | |
2573 | } | |
2574 | if (!try_module_get(discipline->owner)) { | |
2575 | module_put(base_discipline->owner); | |
2576 | dasd_delete_device(device); | |
2577 | return -EINVAL; | |
2578 | } | |
2579 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2580 | device->discipline = discipline; |
2581 | ||
8e09f215 | 2582 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2583 | rc = discipline->check_device(device); |
2584 | if (rc) { | |
fc19f381 SH |
2585 | pr_warning("%s Setting the DASD online with discipline %s " |
2586 | "failed with rc=%i\n", | |
2587 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
2588 | module_put(discipline->owner); |
2589 | module_put(base_discipline->owner); | |
1da177e4 LT |
2590 | dasd_delete_device(device); |
2591 | return rc; | |
2592 | } | |
2593 | ||
2594 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2595 | if (device->state <= DASD_STATE_KNOWN) { | |
fc19f381 SH |
2596 | pr_warning("%s Setting the DASD online failed because of a " |
2597 | "missing discipline\n", dev_name(&cdev->dev)); | |
1da177e4 LT |
2598 | rc = -ENODEV; |
2599 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2600 | if (device->block) |
2601 | dasd_free_block(device->block); | |
1da177e4 LT |
2602 | dasd_delete_device(device); |
2603 | } else | |
2604 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2605 | dev_name(&cdev->dev)); |
589c74d5 SH |
2606 | |
2607 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2608 | ||
1da177e4 | 2609 | dasd_put_device(device); |
1da177e4 LT |
2610 | return rc; |
2611 | } | |
2612 | ||
8e09f215 | 2613 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2614 | { |
2615 | struct dasd_device *device; | |
8e09f215 | 2616 | struct dasd_block *block; |
dafd87aa | 2617 | int max_count, open_count; |
1da177e4 LT |
2618 | |
2619 | device = dasd_device_from_cdev(cdev); | |
2620 | if (IS_ERR(device)) | |
2621 | return PTR_ERR(device); | |
2622 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2623 | /* Already doing offline processing */ | |
2624 | dasd_put_device(device); | |
2625 | return 0; | |
2626 | } | |
2627 | /* | |
2628 | * We must make sure that this device is currently not in use. | |
2629 | * The open_count is increased for every opener, that includes | |
2630 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2631 | * in the other openers. | |
2632 | */ | |
8e09f215 | 2633 | if (device->block) { |
a806170e HC |
2634 | max_count = device->block->bdev ? 0 : -1; |
2635 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2636 | if (open_count > max_count) { |
2637 | if (open_count > 0) | |
fc19f381 SH |
2638 | pr_warning("%s: The DASD cannot be set offline " |
2639 | "with open count %i\n", | |
2640 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 2641 | else |
fc19f381 SH |
2642 | pr_warning("%s: The DASD cannot be set offline " |
2643 | "while it is in use\n", | |
2644 | dev_name(&cdev->dev)); | |
8e09f215 SW |
2645 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2646 | dasd_put_device(device); | |
2647 | return -EBUSY; | |
2648 | } | |
1da177e4 LT |
2649 | } |
2650 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2651 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2652 | block = device->block; |
2653 | device->block = NULL; | |
1da177e4 | 2654 | dasd_delete_device(device); |
8e09f215 SW |
2655 | /* |
2656 | * life cycle of block is bound to device, so delete it after | |
2657 | * device was safely removed | |
2658 | */ | |
2659 | if (block) | |
2660 | dasd_free_block(block); | |
1da177e4 LT |
2661 | return 0; |
2662 | } | |
2663 | ||
a4d26c6a SW |
2664 | int dasd_generic_last_path_gone(struct dasd_device *device) |
2665 | { | |
2666 | struct dasd_ccw_req *cqr; | |
2667 | ||
2668 | dev_warn(&device->cdev->dev, "No operational channel path is left " | |
2669 | "for the device\n"); | |
2670 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); | |
2671 | /* First of all call extended error reporting. */ | |
2672 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2673 | ||
2674 | if (device->state < DASD_STATE_BASIC) | |
2675 | return 0; | |
2676 | /* Device is active. We want to keep it. */ | |
2677 | list_for_each_entry(cqr, &device->ccw_queue, devlist) | |
2678 | if ((cqr->status == DASD_CQR_IN_IO) || | |
2679 | (cqr->status == DASD_CQR_CLEAR_PENDING)) { | |
2680 | cqr->status = DASD_CQR_QUEUED; | |
2681 | cqr->retries++; | |
2682 | } | |
2683 | dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); | |
2684 | dasd_device_clear_timer(device); | |
2685 | dasd_schedule_device_bh(device); | |
2686 | return 1; | |
2687 | } | |
2688 | EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); | |
2689 | ||
2690 | int dasd_generic_path_operational(struct dasd_device *device) | |
2691 | { | |
2692 | dev_info(&device->cdev->dev, "A channel path to the device has become " | |
2693 | "operational\n"); | |
2694 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); | |
2695 | dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); | |
2696 | if (device->stopped & DASD_UNRESUMED_PM) { | |
2697 | dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); | |
2698 | dasd_restore_device(device); | |
2699 | return 1; | |
2700 | } | |
2701 | dasd_schedule_device_bh(device); | |
2702 | if (device->block) | |
2703 | dasd_schedule_block_bh(device->block); | |
2704 | return 1; | |
2705 | } | |
2706 | EXPORT_SYMBOL_GPL(dasd_generic_path_operational); | |
2707 | ||
8e09f215 | 2708 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2709 | { |
2710 | struct dasd_device *device; | |
1da177e4 LT |
2711 | int ret; |
2712 | ||
91c36919 | 2713 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2714 | if (IS_ERR(device)) |
2715 | return 0; | |
1da177e4 LT |
2716 | ret = 0; |
2717 | switch (event) { | |
2718 | case CIO_GONE: | |
47593bfa | 2719 | case CIO_BOXED: |
1da177e4 | 2720 | case CIO_NO_PATH: |
a4d26c6a SW |
2721 | device->path_data.opm = 0; |
2722 | device->path_data.ppm = 0; | |
2723 | device->path_data.npm = 0; | |
2724 | ret = dasd_generic_last_path_gone(device); | |
1da177e4 LT |
2725 | break; |
2726 | case CIO_OPER: | |
1da177e4 | 2727 | ret = 1; |
a4d26c6a SW |
2728 | if (device->path_data.opm) |
2729 | ret = dasd_generic_path_operational(device); | |
1da177e4 LT |
2730 | break; |
2731 | } | |
1da177e4 LT |
2732 | dasd_put_device(device); |
2733 | return ret; | |
2734 | } | |
2735 | ||
a4d26c6a SW |
2736 | void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) |
2737 | { | |
2738 | int chp; | |
2739 | __u8 oldopm, eventlpm; | |
2740 | struct dasd_device *device; | |
2741 | ||
2742 | device = dasd_device_from_cdev_locked(cdev); | |
2743 | if (IS_ERR(device)) | |
2744 | return; | |
2745 | for (chp = 0; chp < 8; chp++) { | |
2746 | eventlpm = 0x80 >> chp; | |
2747 | if (path_event[chp] & PE_PATH_GONE) { | |
2748 | oldopm = device->path_data.opm; | |
2749 | device->path_data.opm &= ~eventlpm; | |
2750 | device->path_data.ppm &= ~eventlpm; | |
2751 | device->path_data.npm &= ~eventlpm; | |
2752 | if (oldopm && !device->path_data.opm) | |
2753 | dasd_generic_last_path_gone(device); | |
2754 | } | |
2755 | if (path_event[chp] & PE_PATH_AVAILABLE) { | |
2756 | device->path_data.opm &= ~eventlpm; | |
2757 | device->path_data.ppm &= ~eventlpm; | |
2758 | device->path_data.npm &= ~eventlpm; | |
2759 | device->path_data.tbvpm |= eventlpm; | |
2760 | dasd_schedule_device_bh(device); | |
2761 | } | |
2762 | } | |
2763 | dasd_put_device(device); | |
2764 | } | |
2765 | EXPORT_SYMBOL_GPL(dasd_generic_path_event); | |
2766 | ||
2767 | int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) | |
2768 | { | |
2769 | if (!device->path_data.opm && lpm) { | |
2770 | device->path_data.opm = lpm; | |
2771 | dasd_generic_path_operational(device); | |
2772 | } else | |
2773 | device->path_data.opm |= lpm; | |
2774 | return 0; | |
2775 | } | |
2776 | EXPORT_SYMBOL_GPL(dasd_generic_verify_path); | |
2777 | ||
2778 | ||
d41dd122 SH |
2779 | int dasd_generic_pm_freeze(struct ccw_device *cdev) |
2780 | { | |
2781 | struct dasd_ccw_req *cqr, *n; | |
2782 | int rc; | |
2783 | struct list_head freeze_queue; | |
2784 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2785 | ||
2786 | if (IS_ERR(device)) | |
2787 | return PTR_ERR(device); | |
6f272b9c SH |
2788 | |
2789 | if (device->discipline->freeze) | |
2790 | rc = device->discipline->freeze(device); | |
2791 | ||
d41dd122 | 2792 | /* disallow new I/O */ |
eb6e199b | 2793 | dasd_device_set_stop_bits(device, DASD_STOPPED_PM); |
d41dd122 SH |
2794 | /* clear active requests */ |
2795 | INIT_LIST_HEAD(&freeze_queue); | |
2796 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2797 | rc = 0; | |
2798 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { | |
2799 | /* Check status and move request to flush_queue */ | |
2800 | if (cqr->status == DASD_CQR_IN_IO) { | |
2801 | rc = device->discipline->term_IO(cqr); | |
2802 | if (rc) { | |
2803 | /* unable to terminate requeust */ | |
2804 | dev_err(&device->cdev->dev, | |
2805 | "Unable to terminate request %p " | |
2806 | "on suspend\n", cqr); | |
2807 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2808 | dasd_put_device(device); | |
2809 | return rc; | |
2810 | } | |
2811 | } | |
2812 | list_move_tail(&cqr->devlist, &freeze_queue); | |
2813 | } | |
2814 | ||
2815 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2816 | ||
2817 | list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { | |
2818 | wait_event(dasd_flush_wq, | |
2819 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
2820 | if (cqr->status == DASD_CQR_CLEARED) | |
2821 | cqr->status = DASD_CQR_QUEUED; | |
2822 | } | |
2823 | /* move freeze_queue to start of the ccw_queue */ | |
2824 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2825 | list_splice_tail(&freeze_queue, &device->ccw_queue); | |
2826 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2827 | ||
d41dd122 SH |
2828 | dasd_put_device(device); |
2829 | return rc; | |
2830 | } | |
2831 | EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); | |
2832 | ||
2833 | int dasd_generic_restore_device(struct ccw_device *cdev) | |
2834 | { | |
2835 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2836 | int rc = 0; | |
2837 | ||
2838 | if (IS_ERR(device)) | |
2839 | return PTR_ERR(device); | |
2840 | ||
e6125fba | 2841 | /* allow new IO again */ |
eb6e199b SW |
2842 | dasd_device_remove_stop_bits(device, |
2843 | (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); | |
e6125fba | 2844 | |
d41dd122 | 2845 | dasd_schedule_device_bh(device); |
d41dd122 | 2846 | |
eb6e199b SW |
2847 | /* |
2848 | * call discipline restore function | |
2849 | * if device is stopped do nothing e.g. for disconnected devices | |
2850 | */ | |
2851 | if (device->discipline->restore && !(device->stopped)) | |
d41dd122 | 2852 | rc = device->discipline->restore(device); |
eb6e199b | 2853 | if (rc || device->stopped) |
e6125fba SH |
2854 | /* |
2855 | * if the resume failed for the DASD we put it in | |
2856 | * an UNRESUMED stop state | |
2857 | */ | |
2858 | device->stopped |= DASD_UNRESUMED_PM; | |
d41dd122 | 2859 | |
6fca97a9 SH |
2860 | if (device->block) |
2861 | dasd_schedule_block_bh(device->block); | |
2862 | ||
d41dd122 | 2863 | dasd_put_device(device); |
e6125fba | 2864 | return 0; |
d41dd122 SH |
2865 | } |
2866 | EXPORT_SYMBOL_GPL(dasd_generic_restore_device); | |
2867 | ||
763968e2 HC |
2868 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2869 | void *rdc_buffer, | |
2870 | int rdc_buffer_size, | |
68b781fe | 2871 | int magic) |
17283b56 CH |
2872 | { |
2873 | struct dasd_ccw_req *cqr; | |
2874 | struct ccw1 *ccw; | |
d9fa9441 | 2875 | unsigned long *idaw; |
17283b56 CH |
2876 | |
2877 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2878 | ||
2879 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
2880 | /* internal error 13 - Allocating the RDC request failed*/ |
2881 | dev_err(&device->cdev->dev, | |
2882 | "An error occurred in the DASD device driver, " | |
2883 | "reason=%s\n", "13"); | |
17283b56 CH |
2884 | return cqr; |
2885 | } | |
2886 | ||
2887 | ccw = cqr->cpaddr; | |
2888 | ccw->cmd_code = CCW_CMD_RDC; | |
d9fa9441 SH |
2889 | if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { |
2890 | idaw = (unsigned long *) (cqr->data); | |
2891 | ccw->cda = (__u32)(addr_t) idaw; | |
2892 | ccw->flags = CCW_FLAG_IDA; | |
2893 | idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); | |
2894 | } else { | |
2895 | ccw->cda = (__u32)(addr_t) rdc_buffer; | |
2896 | ccw->flags = 0; | |
2897 | } | |
17283b56 | 2898 | |
d9fa9441 | 2899 | ccw->count = rdc_buffer_size; |
8e09f215 SW |
2900 | cqr->startdev = device; |
2901 | cqr->memdev = device; | |
17283b56 | 2902 | cqr->expires = 10*HZ; |
eb6e199b | 2903 | cqr->retries = 256; |
17283b56 CH |
2904 | cqr->buildclk = get_clock(); |
2905 | cqr->status = DASD_CQR_FILLED; | |
2906 | return cqr; | |
2907 | } | |
2908 | ||
2909 | ||
68b781fe | 2910 | int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
92636b15 | 2911 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
2912 | { |
2913 | int ret; | |
2914 | struct dasd_ccw_req *cqr; | |
2915 | ||
92636b15 | 2916 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
2917 | magic); |
2918 | if (IS_ERR(cqr)) | |
2919 | return PTR_ERR(cqr); | |
2920 | ||
2921 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2922 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2923 | return ret; |
2924 | } | |
aaff0f64 | 2925 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2926 | |
f3eb5384 SW |
2927 | /* |
2928 | * In command mode and transport mode we need to look for sense | |
2929 | * data in different places. The sense data itself is allways | |
2930 | * an array of 32 bytes, so we can unify the sense data access | |
2931 | * for both modes. | |
2932 | */ | |
2933 | char *dasd_get_sense(struct irb *irb) | |
2934 | { | |
2935 | struct tsb *tsb = NULL; | |
2936 | char *sense = NULL; | |
2937 | ||
2938 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
2939 | if (irb->scsw.tm.tcw) | |
2940 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
2941 | irb->scsw.tm.tcw); | |
2942 | if (tsb && tsb->length == 64 && tsb->flags) | |
2943 | switch (tsb->flags & 0x07) { | |
2944 | case 1: /* tsa_iostat */ | |
2945 | sense = tsb->tsa.iostat.sense; | |
2946 | break; | |
2947 | case 2: /* tsa_ddpc */ | |
2948 | sense = tsb->tsa.ddpc.sense; | |
2949 | break; | |
2950 | default: | |
2951 | /* currently we don't use interrogate data */ | |
2952 | break; | |
2953 | } | |
2954 | } else if (irb->esw.esw0.erw.cons) { | |
2955 | sense = irb->ecw; | |
2956 | } | |
2957 | return sense; | |
2958 | } | |
2959 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
2960 | ||
8e09f215 | 2961 | static int __init dasd_init(void) |
1da177e4 LT |
2962 | { |
2963 | int rc; | |
2964 | ||
2965 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2966 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2967 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2968 | |
2969 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2970 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2971 | if (dasd_debug_area == NULL) { |
2972 | rc = -ENOMEM; | |
2973 | goto failed; | |
2974 | } | |
2975 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2976 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2977 | |
2978 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2979 | ||
2980 | dasd_diag_discipline_pointer = NULL; | |
2981 | ||
1da177e4 LT |
2982 | rc = dasd_devmap_init(); |
2983 | if (rc) | |
2984 | goto failed; | |
2985 | rc = dasd_gendisk_init(); | |
2986 | if (rc) | |
2987 | goto failed; | |
2988 | rc = dasd_parse(); | |
2989 | if (rc) | |
2990 | goto failed; | |
20c64468 SW |
2991 | rc = dasd_eer_init(); |
2992 | if (rc) | |
2993 | goto failed; | |
1da177e4 LT |
2994 | #ifdef CONFIG_PROC_FS |
2995 | rc = dasd_proc_init(); | |
2996 | if (rc) | |
2997 | goto failed; | |
2998 | #endif | |
2999 | ||
3000 | return 0; | |
3001 | failed: | |
fc19f381 | 3002 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
3003 | dasd_exit(); |
3004 | return rc; | |
3005 | } | |
3006 | ||
3007 | module_init(dasd_init); | |
3008 | module_exit(dasd_exit); | |
3009 | ||
3010 | EXPORT_SYMBOL(dasd_debug_area); | |
3011 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
3012 | ||
3013 | EXPORT_SYMBOL(dasd_add_request_head); | |
3014 | EXPORT_SYMBOL(dasd_add_request_tail); | |
3015 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
3016 | EXPORT_SYMBOL(dasd_device_clear_timer); |
3017 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
3018 | EXPORT_SYMBOL(dasd_enable_device); |
3019 | EXPORT_SYMBOL(dasd_int_handler); | |
3020 | EXPORT_SYMBOL(dasd_kfree_request); | |
3021 | EXPORT_SYMBOL(dasd_kick_device); | |
3022 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
3023 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
3024 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 3025 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
3026 | EXPORT_SYMBOL(dasd_device_set_timer); |
3027 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
3028 | EXPORT_SYMBOL(dasd_sfree_request); |
3029 | EXPORT_SYMBOL(dasd_sleep_on); | |
3030 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
3031 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
3032 | EXPORT_SYMBOL(dasd_smalloc_request); | |
3033 | EXPORT_SYMBOL(dasd_start_IO); | |
3034 | EXPORT_SYMBOL(dasd_term_IO); | |
3035 | ||
3036 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
3037 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
3038 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
3039 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
3040 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
3041 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
3042 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
3043 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
3044 | EXPORT_SYMBOL_GPL(dasd_free_block); |