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 | ||
1da177e4 LT |
14 | #include <linux/kmod.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/buffer_head.h> | |
a885c8c4 | 21 | #include <linux/hdreg.h> |
f3445a1a | 22 | #include <linux/async.h> |
9eb25122 | 23 | #include <linux/mutex.h> |
1da177e4 LT |
24 | |
25 | #include <asm/ccwdev.h> | |
26 | #include <asm/ebcdic.h> | |
27 | #include <asm/idals.h> | |
f3eb5384 | 28 | #include <asm/itcw.h> |
33b62a30 | 29 | #include <asm/diag.h> |
1da177e4 LT |
30 | |
31 | /* This is ugly... */ | |
32 | #define PRINTK_HEADER "dasd:" | |
33 | ||
34 | #include "dasd_int.h" | |
35 | /* | |
36 | * SECTION: Constant definitions to be used within this file | |
37 | */ | |
38 | #define DASD_CHANQ_MAX_SIZE 4 | |
39 | ||
1c1e093c SW |
40 | #define DASD_SLEEPON_START_TAG (void *) 1 |
41 | #define DASD_SLEEPON_END_TAG (void *) 2 | |
42 | ||
1da177e4 LT |
43 | /* |
44 | * SECTION: exported variables of dasd.c | |
45 | */ | |
46 | debug_info_t *dasd_debug_area; | |
47 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 48 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
49 | |
50 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
51 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
52 | " Copyright 2000 IBM Corporation"); | |
53 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
54 | MODULE_LICENSE("GPL"); |
55 | ||
56 | /* | |
57 | * SECTION: prototypes for static functions of dasd.c | |
58 | */ | |
8e09f215 SW |
59 | static int dasd_alloc_queue(struct dasd_block *); |
60 | static void dasd_setup_queue(struct dasd_block *); | |
61 | static void dasd_free_queue(struct dasd_block *); | |
62 | static void dasd_flush_request_queue(struct dasd_block *); | |
63 | static int dasd_flush_block_queue(struct dasd_block *); | |
64 | static void dasd_device_tasklet(struct dasd_device *); | |
65 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 66 | static void do_kick_device(struct work_struct *); |
d41dd122 | 67 | static void do_restore_device(struct work_struct *); |
501183f2 | 68 | static void do_reload_device(struct work_struct *); |
8e09f215 | 69 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
70 | static void dasd_device_timeout(unsigned long); |
71 | static void dasd_block_timeout(unsigned long); | |
eb6e199b | 72 | static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); |
1da177e4 LT |
73 | |
74 | /* | |
75 | * SECTION: Operations on the device structure. | |
76 | */ | |
77 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 78 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 79 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
80 | |
81 | /* | |
82 | * Allocate memory for a new device structure. | |
83 | */ | |
8e09f215 | 84 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
85 | { |
86 | struct dasd_device *device; | |
87 | ||
8e09f215 SW |
88 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
89 | if (!device) | |
1da177e4 | 90 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
91 | |
92 | /* Get two pages for normal block device operations. */ | |
93 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 94 | if (!device->ccw_mem) { |
1da177e4 LT |
95 | kfree(device); |
96 | return ERR_PTR(-ENOMEM); | |
97 | } | |
98 | /* Get one page for error recovery. */ | |
99 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 100 | if (!device->erp_mem) { |
1da177e4 LT |
101 | free_pages((unsigned long) device->ccw_mem, 1); |
102 | kfree(device); | |
103 | return ERR_PTR(-ENOMEM); | |
104 | } | |
105 | ||
106 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
107 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
108 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 109 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 110 | tasklet_init(&device->tasklet, |
8e09f215 | 111 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
112 | (unsigned long) device); |
113 | INIT_LIST_HEAD(&device->ccw_queue); | |
114 | init_timer(&device->timer); | |
48cae885 SW |
115 | device->timer.function = dasd_device_timeout; |
116 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 117 | INIT_WORK(&device->kick_work, do_kick_device); |
d41dd122 | 118 | INIT_WORK(&device->restore_device, do_restore_device); |
501183f2 | 119 | INIT_WORK(&device->reload_device, do_reload_device); |
1da177e4 LT |
120 | device->state = DASD_STATE_NEW; |
121 | device->target = DASD_STATE_NEW; | |
9eb25122 | 122 | mutex_init(&device->state_mutex); |
1da177e4 LT |
123 | |
124 | return device; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Free memory of a device structure. | |
129 | */ | |
8e09f215 | 130 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 131 | { |
17fd682e | 132 | kfree(device->private); |
1da177e4 LT |
133 | free_page((unsigned long) device->erp_mem); |
134 | free_pages((unsigned long) device->ccw_mem, 1); | |
135 | kfree(device); | |
136 | } | |
137 | ||
8e09f215 SW |
138 | /* |
139 | * Allocate memory for a new device structure. | |
140 | */ | |
141 | struct dasd_block *dasd_alloc_block(void) | |
142 | { | |
143 | struct dasd_block *block; | |
144 | ||
145 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
146 | if (!block) | |
147 | return ERR_PTR(-ENOMEM); | |
148 | /* open_count = 0 means device online but not in use */ | |
149 | atomic_set(&block->open_count, -1); | |
150 | ||
151 | spin_lock_init(&block->request_queue_lock); | |
152 | atomic_set(&block->tasklet_scheduled, 0); | |
153 | tasklet_init(&block->tasklet, | |
154 | (void (*)(unsigned long)) dasd_block_tasklet, | |
155 | (unsigned long) block); | |
156 | INIT_LIST_HEAD(&block->ccw_queue); | |
157 | spin_lock_init(&block->queue_lock); | |
158 | init_timer(&block->timer); | |
48cae885 SW |
159 | block->timer.function = dasd_block_timeout; |
160 | block->timer.data = (unsigned long) block; | |
8e09f215 SW |
161 | |
162 | return block; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Free memory of a device structure. | |
167 | */ | |
168 | void dasd_free_block(struct dasd_block *block) | |
169 | { | |
170 | kfree(block); | |
171 | } | |
172 | ||
1da177e4 LT |
173 | /* |
174 | * Make a new device known to the system. | |
175 | */ | |
8e09f215 | 176 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
177 | { |
178 | int rc; | |
179 | ||
180 | /* | |
138c014d | 181 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
182 | * keep the reference count > 0. |
183 | */ | |
184 | dasd_get_device(device); | |
185 | ||
8e09f215 SW |
186 | if (device->block) { |
187 | rc = dasd_alloc_queue(device->block); | |
188 | if (rc) { | |
189 | dasd_put_device(device); | |
190 | return rc; | |
191 | } | |
1da177e4 | 192 | } |
1da177e4 LT |
193 | device->state = DASD_STATE_KNOWN; |
194 | return 0; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Let the system forget about a device. | |
199 | */ | |
8e09f215 | 200 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 201 | { |
20c64468 SW |
202 | /* Disable extended error reporting for this device. */ |
203 | dasd_eer_disable(device); | |
1da177e4 | 204 | /* Forget the discipline information. */ |
8e09f215 SW |
205 | if (device->discipline) { |
206 | if (device->discipline->uncheck_device) | |
207 | device->discipline->uncheck_device(device); | |
aa88861f | 208 | module_put(device->discipline->owner); |
8e09f215 | 209 | } |
1da177e4 | 210 | device->discipline = NULL; |
aa88861f PO |
211 | if (device->base_discipline) |
212 | module_put(device->base_discipline->owner); | |
213 | device->base_discipline = NULL; | |
1da177e4 LT |
214 | device->state = DASD_STATE_NEW; |
215 | ||
8e09f215 SW |
216 | if (device->block) |
217 | dasd_free_queue(device->block); | |
1da177e4 LT |
218 | |
219 | /* Give up reference we took in dasd_state_new_to_known. */ | |
220 | dasd_put_device(device); | |
8f61701b | 221 | return 0; |
1da177e4 LT |
222 | } |
223 | ||
224 | /* | |
225 | * Request the irq line for the device. | |
226 | */ | |
8e09f215 | 227 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
228 | { |
229 | int rc; | |
230 | ||
231 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
232 | if (device->block) { |
233 | rc = dasd_gendisk_alloc(device->block); | |
234 | if (rc) | |
235 | return rc; | |
236 | } | |
1da177e4 | 237 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 238 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 239 | 8 * sizeof(long)); |
1da177e4 | 240 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 241 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
242 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
243 | ||
244 | device->state = DASD_STATE_BASIC; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | /* | |
249 | * Release the irq line for the device. Terminate any running i/o. | |
250 | */ | |
8e09f215 | 251 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 252 | { |
8f61701b | 253 | int rc; |
8e09f215 SW |
254 | if (device->block) { |
255 | dasd_gendisk_free(device->block); | |
256 | dasd_block_clear_timer(device->block); | |
257 | } | |
258 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
259 | if (rc) |
260 | return rc; | |
8e09f215 | 261 | dasd_device_clear_timer(device); |
8f61701b | 262 | |
1da177e4 LT |
263 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
264 | if (device->debug_area != NULL) { | |
265 | debug_unregister(device->debug_area); | |
266 | device->debug_area = NULL; | |
267 | } | |
268 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 269 | return 0; |
1da177e4 LT |
270 | } |
271 | ||
272 | /* | |
273 | * Do the initial analysis. The do_analysis function may return | |
274 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
275 | * until the discipline decides to continue the startup sequence | |
276 | * by calling the function dasd_change_state. The eckd disciplines | |
277 | * uses this to start a ccw that detects the format. The completion | |
278 | * interrupt for this detection ccw uses the kernel event daemon to | |
279 | * trigger the call to dasd_change_state. All this is done in the | |
280 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
281 | * After the analysis ccw is done (do_analysis returned 0) the block |
282 | * device is setup. | |
283 | * In case the analysis returns an error, the device setup is stopped | |
284 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 285 | */ |
8e09f215 | 286 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
287 | { |
288 | int rc; | |
8e09f215 | 289 | struct dasd_block *block; |
1da177e4 LT |
290 | |
291 | rc = 0; | |
8e09f215 | 292 | block = device->block; |
90f0094d | 293 | /* make disk known with correct capacity */ |
8e09f215 SW |
294 | if (block) { |
295 | if (block->base->discipline->do_analysis != NULL) | |
296 | rc = block->base->discipline->do_analysis(block); | |
297 | if (rc) { | |
298 | if (rc != -EAGAIN) | |
299 | device->state = DASD_STATE_UNFMT; | |
300 | return rc; | |
301 | } | |
302 | dasd_setup_queue(block); | |
303 | set_capacity(block->gdp, | |
304 | block->blocks << block->s2b_shift); | |
305 | device->state = DASD_STATE_READY; | |
306 | rc = dasd_scan_partitions(block); | |
307 | if (rc) | |
308 | device->state = DASD_STATE_BASIC; | |
309 | } else { | |
310 | device->state = DASD_STATE_READY; | |
311 | } | |
90f0094d | 312 | return rc; |
1da177e4 LT |
313 | } |
314 | ||
315 | /* | |
316 | * Remove device from block device layer. Destroy dirty buffers. | |
317 | * Forget format information. Check if the target level is basic | |
318 | * and if it is create fake disk for formatting. | |
319 | */ | |
8e09f215 | 320 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 321 | { |
8f61701b HH |
322 | int rc; |
323 | ||
1da177e4 | 324 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
325 | if (device->block) { |
326 | struct dasd_block *block = device->block; | |
327 | rc = dasd_flush_block_queue(block); | |
328 | if (rc) { | |
329 | device->state = DASD_STATE_READY; | |
330 | return rc; | |
331 | } | |
8e09f215 | 332 | dasd_flush_request_queue(block); |
b695adfa | 333 | dasd_destroy_partitions(block); |
8e09f215 SW |
334 | block->blocks = 0; |
335 | block->bp_block = 0; | |
336 | block->s2b_shift = 0; | |
337 | } | |
8f61701b | 338 | return 0; |
1da177e4 LT |
339 | } |
340 | ||
90f0094d HH |
341 | /* |
342 | * Back to basic. | |
343 | */ | |
8e09f215 | 344 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
345 | { |
346 | device->state = DASD_STATE_BASIC; | |
8f61701b | 347 | return 0; |
90f0094d HH |
348 | } |
349 | ||
1da177e4 LT |
350 | /* |
351 | * Make the device online and schedule the bottom half to start | |
352 | * the requeueing of requests from the linux request queue to the | |
353 | * ccw queue. | |
354 | */ | |
8f61701b | 355 | static int |
1da177e4 LT |
356 | dasd_state_ready_to_online(struct dasd_device * device) |
357 | { | |
8e09f215 | 358 | int rc; |
1301809b SW |
359 | struct gendisk *disk; |
360 | struct disk_part_iter piter; | |
361 | struct hd_struct *part; | |
8e09f215 SW |
362 | |
363 | if (device->discipline->ready_to_online) { | |
364 | rc = device->discipline->ready_to_online(device); | |
365 | if (rc) | |
366 | return rc; | |
367 | } | |
1da177e4 | 368 | device->state = DASD_STATE_ONLINE; |
1301809b | 369 | if (device->block) { |
8e09f215 | 370 | dasd_schedule_block_bh(device->block); |
1301809b SW |
371 | disk = device->block->bdev->bd_disk; |
372 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
373 | while ((part = disk_part_iter_next(&piter))) | |
374 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
375 | disk_part_iter_exit(&piter); | |
376 | } | |
1da177e4 LT |
377 | return 0; |
378 | } | |
379 | ||
380 | /* | |
381 | * Stop the requeueing of requests again. | |
382 | */ | |
8e09f215 | 383 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 384 | { |
8e09f215 | 385 | int rc; |
1301809b SW |
386 | struct gendisk *disk; |
387 | struct disk_part_iter piter; | |
388 | struct hd_struct *part; | |
8e09f215 SW |
389 | |
390 | if (device->discipline->online_to_ready) { | |
391 | rc = device->discipline->online_to_ready(device); | |
392 | if (rc) | |
393 | return rc; | |
394 | } | |
1da177e4 | 395 | device->state = DASD_STATE_READY; |
1301809b SW |
396 | if (device->block) { |
397 | disk = device->block->bdev->bd_disk; | |
398 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
399 | while ((part = disk_part_iter_next(&piter))) | |
400 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
401 | disk_part_iter_exit(&piter); | |
402 | } | |
8f61701b | 403 | return 0; |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
407 | * Device startup state changes. | |
408 | */ | |
8e09f215 | 409 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
410 | { |
411 | int rc; | |
412 | ||
413 | rc = 0; | |
414 | if (device->state == DASD_STATE_NEW && | |
415 | device->target >= DASD_STATE_KNOWN) | |
416 | rc = dasd_state_new_to_known(device); | |
417 | ||
418 | if (!rc && | |
419 | device->state == DASD_STATE_KNOWN && | |
420 | device->target >= DASD_STATE_BASIC) | |
421 | rc = dasd_state_known_to_basic(device); | |
422 | ||
423 | if (!rc && | |
424 | device->state == DASD_STATE_BASIC && | |
425 | device->target >= DASD_STATE_READY) | |
426 | rc = dasd_state_basic_to_ready(device); | |
427 | ||
39ccf95e HH |
428 | if (!rc && |
429 | device->state == DASD_STATE_UNFMT && | |
430 | device->target > DASD_STATE_UNFMT) | |
431 | rc = -EPERM; | |
432 | ||
1da177e4 LT |
433 | if (!rc && |
434 | device->state == DASD_STATE_READY && | |
435 | device->target >= DASD_STATE_ONLINE) | |
436 | rc = dasd_state_ready_to_online(device); | |
437 | ||
438 | return rc; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Device shutdown state changes. | |
443 | */ | |
8e09f215 | 444 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 445 | { |
8f61701b HH |
446 | int rc; |
447 | ||
448 | rc = 0; | |
1da177e4 LT |
449 | if (device->state == DASD_STATE_ONLINE && |
450 | device->target <= DASD_STATE_READY) | |
8f61701b | 451 | rc = dasd_state_online_to_ready(device); |
138c014d | 452 | |
8f61701b HH |
453 | if (!rc && |
454 | device->state == DASD_STATE_READY && | |
1da177e4 | 455 | device->target <= DASD_STATE_BASIC) |
8f61701b | 456 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 457 | |
8f61701b HH |
458 | if (!rc && |
459 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 460 | device->target <= DASD_STATE_BASIC) |
8f61701b | 461 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 462 | |
8f61701b HH |
463 | if (!rc && |
464 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 465 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 466 | rc = dasd_state_basic_to_known(device); |
138c014d | 467 | |
8f61701b HH |
468 | if (!rc && |
469 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 470 | device->target <= DASD_STATE_NEW) |
8f61701b | 471 | rc = dasd_state_known_to_new(device); |
1da177e4 | 472 | |
8f61701b | 473 | return rc; |
1da177e4 LT |
474 | } |
475 | ||
476 | /* | |
477 | * This is the main startup/shutdown routine. | |
478 | */ | |
8e09f215 | 479 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 | 480 | { |
181d9522 | 481 | int rc; |
1da177e4 LT |
482 | |
483 | if (device->state == device->target) | |
484 | /* Already where we want to go today... */ | |
485 | return; | |
486 | if (device->state < device->target) | |
487 | rc = dasd_increase_state(device); | |
488 | else | |
489 | rc = dasd_decrease_state(device); | |
181d9522 SO |
490 | if (rc == -EAGAIN) |
491 | return; | |
492 | if (rc) | |
493 | device->target = device->state; | |
1da177e4 | 494 | |
9eb25122 | 495 | if (device->state == device->target) |
1da177e4 | 496 | wake_up(&dasd_init_waitq); |
4dfd5c45 HH |
497 | |
498 | /* let user-space know that the device status changed */ | |
499 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
500 | } |
501 | ||
502 | /* | |
503 | * Kick starter for devices that did not complete the startup/shutdown | |
504 | * procedure or were sleeping because of a pending state. | |
505 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
506 | * event daemon. | |
507 | */ | |
8e09f215 | 508 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 509 | { |
4927b3f7 | 510 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
9eb25122 | 511 | mutex_lock(&device->state_mutex); |
1da177e4 | 512 | dasd_change_state(device); |
9eb25122 | 513 | mutex_unlock(&device->state_mutex); |
8e09f215 | 514 | dasd_schedule_device_bh(device); |
1da177e4 LT |
515 | dasd_put_device(device); |
516 | } | |
517 | ||
8e09f215 | 518 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
519 | { |
520 | dasd_get_device(device); | |
521 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
522 | schedule_work(&device->kick_work); | |
523 | } | |
524 | ||
501183f2 SH |
525 | /* |
526 | * dasd_reload_device will schedule a call do do_reload_device to the kernel | |
527 | * event daemon. | |
528 | */ | |
529 | static void do_reload_device(struct work_struct *work) | |
530 | { | |
531 | struct dasd_device *device = container_of(work, struct dasd_device, | |
532 | reload_device); | |
533 | device->discipline->reload(device); | |
534 | dasd_put_device(device); | |
535 | } | |
536 | ||
537 | void dasd_reload_device(struct dasd_device *device) | |
538 | { | |
539 | dasd_get_device(device); | |
540 | /* queue call to dasd_reload_device to the kernel event daemon. */ | |
541 | schedule_work(&device->reload_device); | |
542 | } | |
543 | EXPORT_SYMBOL(dasd_reload_device); | |
544 | ||
d41dd122 SH |
545 | /* |
546 | * dasd_restore_device will schedule a call do do_restore_device to the kernel | |
547 | * event daemon. | |
548 | */ | |
549 | static void do_restore_device(struct work_struct *work) | |
550 | { | |
551 | struct dasd_device *device = container_of(work, struct dasd_device, | |
552 | restore_device); | |
553 | device->cdev->drv->restore(device->cdev); | |
554 | dasd_put_device(device); | |
555 | } | |
556 | ||
557 | void dasd_restore_device(struct dasd_device *device) | |
558 | { | |
559 | dasd_get_device(device); | |
560 | /* queue call to dasd_restore_device to the kernel event daemon. */ | |
561 | schedule_work(&device->restore_device); | |
562 | } | |
563 | ||
1da177e4 LT |
564 | /* |
565 | * Set the target state for a device and starts the state change. | |
566 | */ | |
8e09f215 | 567 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 568 | { |
f3445a1a | 569 | dasd_get_device(device); |
9eb25122 | 570 | mutex_lock(&device->state_mutex); |
1da177e4 LT |
571 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
572 | if (dasd_probeonly && target > DASD_STATE_READY) | |
573 | target = DASD_STATE_READY; | |
574 | if (device->target != target) { | |
9eb25122 | 575 | if (device->state == target) |
1da177e4 LT |
576 | wake_up(&dasd_init_waitq); |
577 | device->target = target; | |
578 | } | |
579 | if (device->state != device->target) | |
580 | dasd_change_state(device); | |
9eb25122 SH |
581 | mutex_unlock(&device->state_mutex); |
582 | dasd_put_device(device); | |
1da177e4 LT |
583 | } |
584 | ||
585 | /* | |
586 | * Enable devices with device numbers in [from..to]. | |
587 | */ | |
8e09f215 | 588 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
589 | { |
590 | return (device->state == device->target); | |
591 | } | |
592 | ||
8e09f215 | 593 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
594 | { |
595 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
596 | if (device->state <= DASD_STATE_KNOWN) | |
597 | /* No discipline for device found. */ | |
598 | dasd_set_target_state(device, DASD_STATE_NEW); | |
599 | /* Now wait for the devices to come up. */ | |
600 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
601 | } | |
602 | ||
603 | /* | |
604 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
605 | */ | |
606 | #ifdef CONFIG_DASD_PROFILE | |
607 | ||
608 | struct dasd_profile_info_t dasd_global_profile; | |
609 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
610 | ||
611 | /* | |
612 | * Increments counter in global and local profiling structures. | |
613 | */ | |
8e09f215 | 614 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
615 | { \ |
616 | int index; \ | |
617 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
618 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 619 | block->profile.counter[index]++; \ |
1da177e4 LT |
620 | } |
621 | ||
622 | /* | |
623 | * Add profiling information for cqr before execution. | |
624 | */ | |
8e09f215 SW |
625 | static void dasd_profile_start(struct dasd_block *block, |
626 | struct dasd_ccw_req *cqr, | |
627 | struct request *req) | |
1da177e4 LT |
628 | { |
629 | struct list_head *l; | |
630 | unsigned int counter; | |
631 | ||
632 | if (dasd_profile_level != DASD_PROFILE_ON) | |
633 | return; | |
634 | ||
635 | /* count the length of the chanq for statistics */ | |
636 | counter = 0; | |
8e09f215 | 637 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
638 | if (++counter >= 31) |
639 | break; | |
640 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 641 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
642 | } |
643 | ||
644 | /* | |
645 | * Add profiling information for cqr after execution. | |
646 | */ | |
8e09f215 SW |
647 | static void dasd_profile_end(struct dasd_block *block, |
648 | struct dasd_ccw_req *cqr, | |
649 | struct request *req) | |
1da177e4 LT |
650 | { |
651 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
652 | long tottimeps, sectors; | |
653 | ||
654 | if (dasd_profile_level != DASD_PROFILE_ON) | |
655 | return; | |
656 | ||
83096ebf | 657 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
658 | if (!cqr->buildclk || !cqr->startclk || |
659 | !cqr->stopclk || !cqr->endclk || | |
660 | !sectors) | |
661 | return; | |
662 | ||
663 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
664 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
665 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
666 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
667 | tottimeps = tottime / sectors; | |
668 | ||
669 | if (!dasd_global_profile.dasd_io_reqs) | |
670 | memset(&dasd_global_profile, 0, | |
8e09f215 | 671 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
672 | dasd_global_profile.dasd_io_reqs++; |
673 | dasd_global_profile.dasd_io_sects += sectors; | |
674 | ||
8e09f215 SW |
675 | if (!block->profile.dasd_io_reqs) |
676 | memset(&block->profile, 0, | |
677 | sizeof(struct dasd_profile_info_t)); | |
678 | block->profile.dasd_io_reqs++; | |
679 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 680 | |
8e09f215 SW |
681 | dasd_profile_counter(sectors, dasd_io_secs, block); |
682 | dasd_profile_counter(tottime, dasd_io_times, block); | |
683 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
684 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
685 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
686 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
687 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
688 | } |
689 | #else | |
8e09f215 SW |
690 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
691 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
692 | #endif /* CONFIG_DASD_PROFILE */ |
693 | ||
694 | /* | |
695 | * Allocate memory for a channel program with 'cplength' channel | |
696 | * command words and 'datasize' additional space. There are two | |
697 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
698 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
699 | * that gets allocated for each device. | |
700 | */ | |
68b781fe | 701 | struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, |
8e09f215 SW |
702 | int datasize, |
703 | struct dasd_device *device) | |
1da177e4 LT |
704 | { |
705 | struct dasd_ccw_req *cqr; | |
706 | ||
707 | /* Sanity checks */ | |
68b781fe | 708 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 709 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 | 710 | |
88abaab4 | 711 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
712 | if (cqr == NULL) |
713 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
714 | cqr->cpaddr = NULL; |
715 | if (cplength > 0) { | |
88abaab4 | 716 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
717 | GFP_ATOMIC | GFP_DMA); |
718 | if (cqr->cpaddr == NULL) { | |
719 | kfree(cqr); | |
720 | return ERR_PTR(-ENOMEM); | |
721 | } | |
1da177e4 LT |
722 | } |
723 | cqr->data = NULL; | |
724 | if (datasize > 0) { | |
88abaab4 | 725 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 726 | if (cqr->data == NULL) { |
17fd682e | 727 | kfree(cqr->cpaddr); |
1da177e4 LT |
728 | kfree(cqr); |
729 | return ERR_PTR(-ENOMEM); | |
730 | } | |
1da177e4 | 731 | } |
68b781fe | 732 | cqr->magic = magic; |
1da177e4 LT |
733 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
734 | dasd_get_device(device); | |
735 | return cqr; | |
736 | } | |
737 | ||
68b781fe | 738 | struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
8e09f215 SW |
739 | int datasize, |
740 | struct dasd_device *device) | |
1da177e4 LT |
741 | { |
742 | unsigned long flags; | |
743 | struct dasd_ccw_req *cqr; | |
744 | char *data; | |
745 | int size; | |
746 | ||
747 | /* Sanity checks */ | |
68b781fe | 748 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 749 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 LT |
750 | |
751 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
752 | if (cplength > 0) | |
753 | size += cplength * sizeof(struct ccw1); | |
754 | if (datasize > 0) | |
755 | size += datasize; | |
756 | spin_lock_irqsave(&device->mem_lock, flags); | |
757 | cqr = (struct dasd_ccw_req *) | |
758 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
759 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
760 | if (cqr == NULL) | |
761 | return ERR_PTR(-ENOMEM); | |
762 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
763 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
764 | cqr->cpaddr = NULL; | |
765 | if (cplength > 0) { | |
766 | cqr->cpaddr = (struct ccw1 *) data; | |
767 | data += cplength*sizeof(struct ccw1); | |
768 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
769 | } | |
770 | cqr->data = NULL; | |
771 | if (datasize > 0) { | |
772 | cqr->data = data; | |
773 | memset(cqr->data, 0, datasize); | |
774 | } | |
68b781fe | 775 | cqr->magic = magic; |
1da177e4 LT |
776 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
777 | dasd_get_device(device); | |
778 | return cqr; | |
779 | } | |
780 | ||
781 | /* | |
782 | * Free memory of a channel program. This function needs to free all the | |
783 | * idal lists that might have been created by dasd_set_cda and the | |
784 | * struct dasd_ccw_req itself. | |
785 | */ | |
8e09f215 | 786 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 787 | { |
347a8dc3 | 788 | #ifdef CONFIG_64BIT |
1da177e4 LT |
789 | struct ccw1 *ccw; |
790 | ||
791 | /* Clear any idals used for the request. */ | |
792 | ccw = cqr->cpaddr; | |
793 | do { | |
794 | clear_normalized_cda(ccw); | |
795 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
796 | #endif | |
17fd682e JJ |
797 | kfree(cqr->cpaddr); |
798 | kfree(cqr->data); | |
1da177e4 LT |
799 | kfree(cqr); |
800 | dasd_put_device(device); | |
801 | } | |
802 | ||
8e09f215 | 803 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
804 | { |
805 | unsigned long flags; | |
806 | ||
807 | spin_lock_irqsave(&device->mem_lock, flags); | |
808 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
809 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
810 | dasd_put_device(device); | |
811 | } | |
812 | ||
813 | /* | |
814 | * Check discipline magic in cqr. | |
815 | */ | |
8e09f215 | 816 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
817 | { |
818 | struct dasd_device *device; | |
819 | ||
820 | if (cqr == NULL) | |
821 | return -EINVAL; | |
8e09f215 | 822 | device = cqr->startdev; |
1da177e4 | 823 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 824 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
825 | " dasd_ccw_req 0x%08x magic doesn't match" |
826 | " discipline 0x%08x", | |
827 | cqr->magic, | |
828 | *(unsigned int *) device->discipline->name); | |
829 | return -EINVAL; | |
830 | } | |
831 | return 0; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Terminate the current i/o and set the request to clear_pending. | |
836 | * Timer keeps device runnig. | |
837 | * ccw_device_clear can fail if the i/o subsystem | |
838 | * is in a bad mood. | |
839 | */ | |
8e09f215 | 840 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
841 | { |
842 | struct dasd_device *device; | |
843 | int retries, rc; | |
fc19f381 | 844 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
845 | |
846 | /* Check the cqr */ | |
847 | rc = dasd_check_cqr(cqr); | |
848 | if (rc) | |
849 | return rc; | |
850 | retries = 0; | |
8e09f215 | 851 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
852 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
853 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
854 | switch (rc) { | |
855 | case 0: /* termination successful */ | |
c2ba444d | 856 | cqr->retries--; |
8e09f215 | 857 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 858 | cqr->stopclk = get_clock(); |
8f61701b | 859 | cqr->starttime = 0; |
1da177e4 LT |
860 | DBF_DEV_EVENT(DBF_DEBUG, device, |
861 | "terminate cqr %p successful", | |
862 | cqr); | |
863 | break; | |
864 | case -ENODEV: | |
865 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
866 | "device gone, retry"); | |
867 | break; | |
868 | case -EIO: | |
869 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
870 | "I/O error, retry"); | |
871 | break; | |
872 | case -EINVAL: | |
873 | case -EBUSY: | |
874 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
875 | "device busy, retry later"); | |
876 | break; | |
877 | default: | |
fc19f381 SH |
878 | /* internal error 10 - unknown rc*/ |
879 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
880 | dev_err(&device->cdev->dev, "An error occurred in the " | |
881 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
882 | BUG(); |
883 | break; | |
884 | } | |
885 | retries++; | |
886 | } | |
8e09f215 | 887 | dasd_schedule_device_bh(device); |
1da177e4 LT |
888 | return rc; |
889 | } | |
890 | ||
891 | /* | |
892 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
893 | * In that case set up a timer to start the request later. | |
894 | */ | |
8e09f215 | 895 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
896 | { |
897 | struct dasd_device *device; | |
898 | int rc; | |
fc19f381 | 899 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
900 | |
901 | /* Check the cqr */ | |
902 | rc = dasd_check_cqr(cqr); | |
6cc7f168 SW |
903 | if (rc) { |
904 | cqr->intrc = rc; | |
1da177e4 | 905 | return rc; |
6cc7f168 | 906 | } |
8e09f215 | 907 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 908 | if (cqr->retries < 0) { |
fc19f381 SH |
909 | /* internal error 14 - start_IO run out of retries */ |
910 | sprintf(errorstring, "14 %p", cqr); | |
911 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
912 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 913 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
914 | return -EIO; |
915 | } | |
916 | cqr->startclk = get_clock(); | |
917 | cqr->starttime = jiffies; | |
918 | cqr->retries--; | |
f3eb5384 SW |
919 | if (cqr->cpmode == 1) { |
920 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
921 | (long) cqr, cqr->lpm); | |
922 | } else { | |
923 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
924 | (long) cqr, cqr->lpm, 0); | |
925 | } | |
1da177e4 LT |
926 | switch (rc) { |
927 | case 0: | |
928 | cqr->status = DASD_CQR_IN_IO; | |
1da177e4 LT |
929 | break; |
930 | case -EBUSY: | |
fc19f381 | 931 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
932 | "start_IO: device busy, retry later"); |
933 | break; | |
934 | case -ETIMEDOUT: | |
fc19f381 | 935 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
936 | "start_IO: request timeout, retry later"); |
937 | break; | |
938 | case -EACCES: | |
939 | /* -EACCES indicates that the request used only a | |
940 | * subset of the available pathes and all these | |
941 | * pathes are gone. | |
942 | * Do a retry with all available pathes. | |
943 | */ | |
944 | cqr->lpm = LPM_ANYPATH; | |
fc19f381 | 945 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
946 | "start_IO: selected pathes gone," |
947 | " retry on all pathes"); | |
948 | break; | |
949 | case -ENODEV: | |
f3eb5384 SW |
950 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
951 | "start_IO: -ENODEV device gone, retry"); | |
952 | break; | |
1da177e4 | 953 | case -EIO: |
fc19f381 | 954 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
f3eb5384 | 955 | "start_IO: -EIO device gone, retry"); |
1da177e4 | 956 | break; |
d41dd122 SH |
957 | case -EINVAL: |
958 | /* most likely caused in power management context */ | |
959 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", | |
960 | "start_IO: -EINVAL device currently " | |
961 | "not accessible"); | |
962 | break; | |
1da177e4 | 963 | default: |
fc19f381 SH |
964 | /* internal error 11 - unknown rc */ |
965 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
966 | dev_err(&device->cdev->dev, | |
967 | "An error occurred in the DASD device driver, " | |
968 | "reason=%s\n", errorstring); | |
1da177e4 LT |
969 | BUG(); |
970 | break; | |
971 | } | |
6cc7f168 | 972 | cqr->intrc = rc; |
1da177e4 LT |
973 | return rc; |
974 | } | |
975 | ||
976 | /* | |
977 | * Timeout function for dasd devices. This is used for different purposes | |
978 | * 1) missing interrupt handler for normal operation | |
979 | * 2) delayed start of request where start_IO failed with -EBUSY | |
980 | * 3) timeout for missing state change interrupts | |
981 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
982 | * DASD_CQR_QUEUED for 2) and 3). | |
983 | */ | |
8e09f215 | 984 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
985 | { |
986 | unsigned long flags; | |
987 | struct dasd_device *device; | |
988 | ||
989 | device = (struct dasd_device *) ptr; | |
990 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
991 | /* re-activate request queue */ | |
eb6e199b | 992 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
1da177e4 | 993 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
8e09f215 | 994 | dasd_schedule_device_bh(device); |
1da177e4 LT |
995 | } |
996 | ||
997 | /* | |
998 | * Setup timeout for a device in jiffies. | |
999 | */ | |
8e09f215 | 1000 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 1001 | { |
48cae885 SW |
1002 | if (expires == 0) |
1003 | del_timer(&device->timer); | |
1004 | else | |
1005 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | /* | |
1009 | * Clear timeout for a device. | |
1010 | */ | |
8e09f215 | 1011 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 1012 | { |
48cae885 | 1013 | del_timer(&device->timer); |
1da177e4 LT |
1014 | } |
1015 | ||
8e09f215 SW |
1016 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
1017 | unsigned long intparm) | |
1da177e4 LT |
1018 | { |
1019 | struct dasd_ccw_req *cqr; | |
1020 | struct dasd_device *device; | |
1021 | ||
f16f5843 SW |
1022 | if (!intparm) |
1023 | return; | |
1da177e4 LT |
1024 | cqr = (struct dasd_ccw_req *) intparm; |
1025 | if (cqr->status != DASD_CQR_IN_IO) { | |
b8ed5dd5 SH |
1026 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, |
1027 | "invalid status in handle_killed_request: " | |
1028 | "%02x", cqr->status); | |
1da177e4 LT |
1029 | return; |
1030 | } | |
1031 | ||
589c74d5 SH |
1032 | device = dasd_device_from_cdev_locked(cdev); |
1033 | if (IS_ERR(device)) { | |
1034 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", | |
1035 | "unable to get device from cdev"); | |
1036 | return; | |
1037 | } | |
1038 | ||
1039 | if (!cqr->startdev || | |
1040 | device != cqr->startdev || | |
1041 | strncmp(cqr->startdev->discipline->ebcname, | |
1042 | (char *) &cqr->magic, 4)) { | |
294001a8 SH |
1043 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1044 | "invalid device in request"); | |
589c74d5 | 1045 | dasd_put_device(device); |
1da177e4 LT |
1046 | return; |
1047 | } | |
1048 | ||
1049 | /* Schedule request to be retried. */ | |
1050 | cqr->status = DASD_CQR_QUEUED; | |
1051 | ||
8e09f215 SW |
1052 | dasd_device_clear_timer(device); |
1053 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1054 | dasd_put_device(device); |
1055 | } | |
1056 | ||
8e09f215 | 1057 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 1058 | { |
20c64468 SW |
1059 | /* First of all start sense subsystem status request. */ |
1060 | dasd_eer_snss(device); | |
1061 | ||
eb6e199b | 1062 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
8e09f215 SW |
1063 | dasd_schedule_device_bh(device); |
1064 | if (device->block) | |
1065 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
1066 | } |
1067 | ||
1068 | /* | |
1069 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1070 | */ | |
8e09f215 SW |
1071 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1072 | struct irb *irb) | |
1da177e4 LT |
1073 | { |
1074 | struct dasd_ccw_req *cqr, *next; | |
1075 | struct dasd_device *device; | |
1076 | unsigned long long now; | |
1077 | int expires; | |
1da177e4 LT |
1078 | |
1079 | if (IS_ERR(irb)) { | |
1080 | switch (PTR_ERR(irb)) { | |
1081 | case -EIO: | |
1da177e4 LT |
1082 | break; |
1083 | case -ETIMEDOUT: | |
b8ed5dd5 SH |
1084 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1085 | "request timed out\n", __func__); | |
1da177e4 LT |
1086 | break; |
1087 | default: | |
b8ed5dd5 SH |
1088 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1089 | "unknown error %ld\n", __func__, | |
1090 | PTR_ERR(irb)); | |
1da177e4 | 1091 | } |
f16f5843 | 1092 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1093 | return; |
1094 | } | |
1095 | ||
1096 | now = get_clock(); | |
1097 | ||
8e09f215 SW |
1098 | /* check for unsolicited interrupts */ |
1099 | cqr = (struct dasd_ccw_req *) intparm; | |
f3eb5384 SW |
1100 | if (!cqr || ((scsw_cc(&irb->scsw) == 1) && |
1101 | (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) && | |
1102 | (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) { | |
8e09f215 SW |
1103 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
1104 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1105 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1106 | if (!IS_ERR(device)) { |
8e09f215 SW |
1107 | dasd_device_clear_timer(device); |
1108 | device->discipline->handle_unsolicited_interrupt(device, | |
1109 | irb); | |
1da177e4 LT |
1110 | dasd_put_device(device); |
1111 | } | |
1112 | return; | |
1113 | } | |
1114 | ||
8e09f215 SW |
1115 | device = (struct dasd_device *) cqr->startdev; |
1116 | if (!device || | |
1da177e4 | 1117 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
294001a8 SH |
1118 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1119 | "invalid device in request"); | |
1da177e4 LT |
1120 | return; |
1121 | } | |
1122 | ||
1123 | /* Check for clear pending */ | |
8e09f215 | 1124 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1125 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1126 | cqr->status = DASD_CQR_CLEARED; |
1127 | dasd_device_clear_timer(device); | |
8f61701b | 1128 | wake_up(&dasd_flush_wq); |
8e09f215 | 1129 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1130 | return; |
1131 | } | |
1132 | ||
f3eb5384 | 1133 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1134 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1135 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1136 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1137 | return; |
1138 | } | |
fc19f381 | 1139 | |
8e09f215 | 1140 | next = NULL; |
1da177e4 | 1141 | expires = 0; |
f3eb5384 SW |
1142 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1143 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1144 | /* request was completed successfully */ |
1145 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1146 | cqr->stopclk = now; |
1147 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1148 | if (cqr->devlist.next != &device->ccw_queue) { |
1149 | next = list_entry(cqr->devlist.next, | |
1150 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1151 | } |
8e09f215 SW |
1152 | } else { /* error */ |
1153 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
fc19f381 SH |
1154 | /* log sense for every failed I/O to s390 debugfeature */ |
1155 | dasd_log_sense_dbf(cqr, irb); | |
9575bf26 | 1156 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1157 | dasd_log_sense(cqr, irb); |
1158 | } | |
fc19f381 | 1159 | |
6c5f57c7 SH |
1160 | /* |
1161 | * If we don't want complex ERP for this request, then just | |
1162 | * reset this and retry it in the fastpath | |
8e09f215 | 1163 | */ |
6c5f57c7 | 1164 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1165 | cqr->retries > 0) { |
fc19f381 SH |
1166 | if (cqr->lpm == LPM_ANYPATH) |
1167 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
1168 | "default ERP in fastpath " | |
1169 | "(%i retries left)", | |
1170 | cqr->retries); | |
8e09f215 SW |
1171 | cqr->lpm = LPM_ANYPATH; |
1172 | cqr->status = DASD_CQR_QUEUED; | |
1173 | next = cqr; | |
1174 | } else | |
1da177e4 | 1175 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1176 | } |
1177 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1178 | (!device->stopped)) { | |
1179 | if (device->discipline->start_IO(next) == 0) | |
1180 | expires = next->expires; | |
1da177e4 LT |
1181 | } |
1182 | if (expires != 0) | |
8e09f215 | 1183 | dasd_device_set_timer(device, expires); |
1da177e4 | 1184 | else |
8e09f215 SW |
1185 | dasd_device_clear_timer(device); |
1186 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1187 | } |
1188 | ||
1189 | /* | |
8e09f215 SW |
1190 | * If we have an error on a dasd_block layer request then we cancel |
1191 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1192 | */ |
8e09f215 SW |
1193 | static void __dasd_device_recovery(struct dasd_device *device, |
1194 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1195 | { |
8e09f215 SW |
1196 | struct list_head *l, *n; |
1197 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1198 | |
8e09f215 SW |
1199 | /* |
1200 | * only requeue request that came from the dasd_block layer | |
1201 | */ | |
1202 | if (!ref_cqr->block) | |
1203 | return; | |
1da177e4 | 1204 | |
8e09f215 SW |
1205 | list_for_each_safe(l, n, &device->ccw_queue) { |
1206 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1207 | if (cqr->status == DASD_CQR_QUEUED && | |
1208 | ref_cqr->block == cqr->block) { | |
1209 | cqr->status = DASD_CQR_CLEARED; | |
1210 | } | |
1211 | } | |
1212 | }; | |
1da177e4 LT |
1213 | |
1214 | /* | |
8e09f215 SW |
1215 | * Remove those ccw requests from the queue that need to be returned |
1216 | * to the upper layer. | |
1da177e4 | 1217 | */ |
8e09f215 SW |
1218 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1219 | struct list_head *final_queue) | |
1da177e4 LT |
1220 | { |
1221 | struct list_head *l, *n; | |
1222 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1223 | |
1da177e4 LT |
1224 | /* Process request with final status. */ |
1225 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1226 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1227 | ||
1da177e4 | 1228 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1229 | if (cqr->status == DASD_CQR_QUEUED || |
1230 | cqr->status == DASD_CQR_IN_IO || | |
1231 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1232 | break; |
1da177e4 | 1233 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1234 | __dasd_device_recovery(device, cqr); |
20c64468 | 1235 | } |
1da177e4 | 1236 | /* Rechain finished requests to final queue */ |
8e09f215 | 1237 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1238 | } |
1239 | } | |
1240 | ||
1da177e4 | 1241 | /* |
8e09f215 SW |
1242 | * the cqrs from the final queue are returned to the upper layer |
1243 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1244 | */ |
8e09f215 SW |
1245 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1246 | struct list_head *final_queue) | |
1da177e4 | 1247 | { |
8e09f215 | 1248 | struct list_head *l, *n; |
1da177e4 | 1249 | struct dasd_ccw_req *cqr; |
03513bcc | 1250 | struct dasd_block *block; |
c80ee724 SH |
1251 | void (*callback)(struct dasd_ccw_req *, void *data); |
1252 | void *callback_data; | |
fc19f381 | 1253 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1254 | |
8e09f215 SW |
1255 | list_for_each_safe(l, n, final_queue) { |
1256 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1257 | list_del_init(&cqr->devlist); | |
03513bcc | 1258 | block = cqr->block; |
c80ee724 SH |
1259 | callback = cqr->callback; |
1260 | callback_data = cqr->callback_data; | |
03513bcc SW |
1261 | if (block) |
1262 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1263 | switch (cqr->status) { |
1264 | case DASD_CQR_SUCCESS: | |
1265 | cqr->status = DASD_CQR_DONE; | |
1266 | break; | |
1267 | case DASD_CQR_ERROR: | |
1268 | cqr->status = DASD_CQR_NEED_ERP; | |
1269 | break; | |
1270 | case DASD_CQR_CLEARED: | |
1271 | cqr->status = DASD_CQR_TERMINATED; | |
1272 | break; | |
1273 | default: | |
fc19f381 SH |
1274 | /* internal error 12 - wrong cqr status*/ |
1275 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1276 | dev_err(&device->cdev->dev, | |
1277 | "An error occurred in the DASD device driver, " | |
1278 | "reason=%s\n", errorstring); | |
8e09f215 | 1279 | BUG(); |
1da177e4 | 1280 | } |
8e09f215 | 1281 | if (cqr->callback != NULL) |
c80ee724 | 1282 | (callback)(cqr, callback_data); |
03513bcc SW |
1283 | if (block) |
1284 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1285 | } |
1286 | } | |
1287 | ||
1288 | /* | |
1289 | * Take a look at the first request on the ccw queue and check | |
1290 | * if it reached its expire time. If so, terminate the IO. | |
1291 | */ | |
8e09f215 | 1292 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1293 | { |
1294 | struct dasd_ccw_req *cqr; | |
1295 | ||
1296 | if (list_empty(&device->ccw_queue)) | |
1297 | return; | |
8e09f215 | 1298 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1299 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1300 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1301 | if (device->discipline->term_IO(cqr) != 0) { | |
1302 | /* Hmpf, try again in 5 sec */ | |
fc19f381 SH |
1303 | dev_err(&device->cdev->dev, |
1304 | "cqr %p timed out (%is) but cannot be " | |
1305 | "ended, retrying in 5 s\n", | |
1306 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1307 | cqr->expires += 5*HZ; |
1308 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1309 | } else { |
fc19f381 SH |
1310 | dev_err(&device->cdev->dev, |
1311 | "cqr %p timed out (%is), %i retries " | |
1312 | "remaining\n", cqr, (cqr->expires/HZ), | |
1313 | cqr->retries); | |
1da177e4 LT |
1314 | } |
1315 | } | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Take a look at the first request on the ccw queue and check | |
1320 | * if it needs to be started. | |
1321 | */ | |
8e09f215 | 1322 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1323 | { |
1324 | struct dasd_ccw_req *cqr; | |
1325 | int rc; | |
1326 | ||
1327 | if (list_empty(&device->ccw_queue)) | |
1328 | return; | |
8e09f215 | 1329 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1330 | if (cqr->status != DASD_CQR_QUEUED) |
1331 | return; | |
8e09f215 SW |
1332 | /* when device is stopped, return request to previous layer */ |
1333 | if (device->stopped) { | |
1334 | cqr->status = DASD_CQR_CLEARED; | |
1335 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1336 | return; |
1c01b8a5 | 1337 | } |
25ee4cf8 PO |
1338 | |
1339 | rc = device->discipline->start_IO(cqr); | |
1340 | if (rc == 0) | |
8e09f215 | 1341 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1342 | else if (rc == -EACCES) { |
8e09f215 | 1343 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1344 | } else |
1345 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1346 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1347 | } |
1348 | ||
1da177e4 | 1349 | /* |
8e09f215 SW |
1350 | * Go through all request on the dasd_device request queue, |
1351 | * terminate them on the cdev if necessary, and return them to the | |
1352 | * submitting layer via callback. | |
1353 | * Note: | |
1354 | * Make sure that all 'submitting layers' still exist when | |
1355 | * this function is called!. In other words, when 'device' is a base | |
1356 | * device then all block layer requests must have been removed before | |
1357 | * via dasd_flush_block_queue. | |
1da177e4 | 1358 | */ |
8e09f215 | 1359 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1360 | { |
8e09f215 SW |
1361 | struct dasd_ccw_req *cqr, *n; |
1362 | int rc; | |
1da177e4 | 1363 | struct list_head flush_queue; |
1da177e4 LT |
1364 | |
1365 | INIT_LIST_HEAD(&flush_queue); | |
1366 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1367 | rc = 0; |
8e09f215 | 1368 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1369 | /* Check status and move request to flush_queue */ |
1370 | switch (cqr->status) { | |
1371 | case DASD_CQR_IN_IO: | |
1372 | rc = device->discipline->term_IO(cqr); | |
1373 | if (rc) { | |
1374 | /* unable to terminate requeust */ | |
fc19f381 SH |
1375 | dev_err(&device->cdev->dev, |
1376 | "Flushing the DASD request queue " | |
1377 | "failed for request %p\n", cqr); | |
8f61701b HH |
1378 | /* stop flush processing */ |
1379 | goto finished; | |
1380 | } | |
1381 | break; | |
1382 | case DASD_CQR_QUEUED: | |
1da177e4 | 1383 | cqr->stopclk = get_clock(); |
8e09f215 | 1384 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1385 | break; |
8e09f215 | 1386 | default: /* no need to modify the others */ |
8f61701b HH |
1387 | break; |
1388 | } | |
8e09f215 | 1389 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1390 | } |
8f61701b HH |
1391 | finished: |
1392 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1393 | /* |
1394 | * After this point all requests must be in state CLEAR_PENDING, | |
1395 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1396 | * one of the others. | |
1397 | */ | |
1398 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1399 | wait_event(dasd_flush_wq, | |
1400 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1401 | /* | |
1402 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1403 | * and call the callback function of flushed requests | |
1404 | */ | |
1405 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1406 | return rc; |
1da177e4 LT |
1407 | } |
1408 | ||
1409 | /* | |
1410 | * Acquire the device lock and process queues for the device. | |
1411 | */ | |
8e09f215 | 1412 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1413 | { |
1414 | struct list_head final_queue; | |
1da177e4 LT |
1415 | |
1416 | atomic_set (&device->tasklet_scheduled, 0); | |
1417 | INIT_LIST_HEAD(&final_queue); | |
1418 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1419 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1420 | __dasd_device_check_expire(device); |
1421 | /* find final requests on ccw queue */ | |
1422 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1423 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1424 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1425 | __dasd_device_process_final_queue(device, &final_queue); |
1426 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1427 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1428 | __dasd_device_start_head(device); |
1429 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1430 | dasd_put_device(device); |
1431 | } | |
1432 | ||
1433 | /* | |
1434 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1435 | */ | |
8e09f215 | 1436 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1437 | { |
1438 | /* Protect against rescheduling. */ | |
973bd993 | 1439 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1440 | return; |
1441 | dasd_get_device(device); | |
1442 | tasklet_hi_schedule(&device->tasklet); | |
1443 | } | |
1444 | ||
eb6e199b SW |
1445 | void dasd_device_set_stop_bits(struct dasd_device *device, int bits) |
1446 | { | |
1447 | device->stopped |= bits; | |
1448 | } | |
1449 | EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); | |
1450 | ||
1451 | void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) | |
1452 | { | |
1453 | device->stopped &= ~bits; | |
1454 | if (!device->stopped) | |
1455 | wake_up(&generic_waitq); | |
1456 | } | |
1457 | EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); | |
1458 | ||
1da177e4 | 1459 | /* |
8e09f215 SW |
1460 | * Queue a request to the head of the device ccw_queue. |
1461 | * Start the I/O if possible. | |
1da177e4 | 1462 | */ |
8e09f215 | 1463 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1464 | { |
1465 | struct dasd_device *device; | |
1466 | unsigned long flags; | |
1467 | ||
8e09f215 | 1468 | device = cqr->startdev; |
1da177e4 | 1469 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1470 | cqr->status = DASD_CQR_QUEUED; |
1471 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1472 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1473 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1474 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1475 | } | |
1476 | ||
1477 | /* | |
8e09f215 SW |
1478 | * Queue a request to the tail of the device ccw_queue. |
1479 | * Start the I/O if possible. | |
1da177e4 | 1480 | */ |
8e09f215 | 1481 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1482 | { |
1483 | struct dasd_device *device; | |
1484 | unsigned long flags; | |
1485 | ||
8e09f215 | 1486 | device = cqr->startdev; |
1da177e4 | 1487 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1488 | cqr->status = DASD_CQR_QUEUED; |
1489 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1490 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1491 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1492 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1493 | } | |
1494 | ||
1495 | /* | |
8e09f215 | 1496 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1497 | */ |
8e09f215 | 1498 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 | 1499 | { |
1c1e093c SW |
1500 | spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); |
1501 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
1502 | spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); | |
1503 | wake_up(&generic_waitq); | |
1da177e4 LT |
1504 | } |
1505 | ||
8e09f215 | 1506 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1507 | { |
1508 | struct dasd_device *device; | |
1509 | int rc; | |
1510 | ||
8e09f215 | 1511 | device = cqr->startdev; |
1da177e4 | 1512 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1c1e093c | 1513 | rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); |
1da177e4 LT |
1514 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1515 | return rc; | |
1516 | } | |
1517 | ||
1518 | /* | |
eb6e199b | 1519 | * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. |
1da177e4 | 1520 | */ |
eb6e199b | 1521 | static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) |
1da177e4 | 1522 | { |
1da177e4 | 1523 | struct dasd_device *device; |
eb6e199b | 1524 | dasd_erp_fn_t erp_fn; |
138c014d | 1525 | |
eb6e199b SW |
1526 | if (cqr->status == DASD_CQR_FILLED) |
1527 | return 0; | |
8e09f215 | 1528 | device = cqr->startdev; |
eb6e199b SW |
1529 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
1530 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1531 | device->discipline->handle_terminated_request(cqr); | |
1532 | return 1; | |
1533 | } | |
1534 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
1535 | erp_fn = device->discipline->erp_action(cqr); | |
1536 | erp_fn(cqr); | |
1537 | return 1; | |
1538 | } | |
1539 | if (cqr->status == DASD_CQR_FAILED) | |
1540 | dasd_log_sense(cqr, &cqr->irb); | |
1541 | if (cqr->refers) { | |
1542 | __dasd_process_erp(device, cqr); | |
1543 | return 1; | |
1544 | } | |
1545 | } | |
1546 | return 0; | |
1547 | } | |
138c014d | 1548 | |
eb6e199b SW |
1549 | static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) |
1550 | { | |
1551 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { | |
1552 | if (cqr->refers) /* erp is not done yet */ | |
1553 | return 1; | |
1554 | return ((cqr->status != DASD_CQR_DONE) && | |
1555 | (cqr->status != DASD_CQR_FAILED)); | |
1556 | } else | |
1557 | return (cqr->status == DASD_CQR_FILLED); | |
1558 | } | |
138c014d | 1559 | |
eb6e199b SW |
1560 | static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) |
1561 | { | |
1562 | struct dasd_device *device; | |
1563 | int rc; | |
1564 | struct list_head ccw_queue; | |
1565 | struct dasd_ccw_req *cqr; | |
1566 | ||
1567 | INIT_LIST_HEAD(&ccw_queue); | |
1568 | maincqr->status = DASD_CQR_FILLED; | |
1569 | device = maincqr->startdev; | |
1570 | list_add(&maincqr->blocklist, &ccw_queue); | |
1571 | for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); | |
1572 | cqr = list_first_entry(&ccw_queue, | |
1573 | struct dasd_ccw_req, blocklist)) { | |
1574 | ||
1575 | if (__dasd_sleep_on_erp(cqr)) | |
1576 | continue; | |
1577 | if (cqr->status != DASD_CQR_FILLED) /* could be failed */ | |
1578 | continue; | |
1579 | ||
1580 | /* Non-temporary stop condition will trigger fail fast */ | |
1581 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
1582 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1583 | (!dasd_eer_enabled(device))) { | |
1584 | cqr->status = DASD_CQR_FAILED; | |
1585 | continue; | |
1586 | } | |
1587 | ||
1588 | /* Don't try to start requests if device is stopped */ | |
1589 | if (interruptible) { | |
1590 | rc = wait_event_interruptible( | |
1591 | generic_waitq, !(device->stopped)); | |
1592 | if (rc == -ERESTARTSYS) { | |
1593 | cqr->status = DASD_CQR_FAILED; | |
1594 | maincqr->intrc = rc; | |
1595 | continue; | |
1596 | } | |
1597 | } else | |
1598 | wait_event(generic_waitq, !(device->stopped)); | |
1599 | ||
1600 | cqr->callback = dasd_wakeup_cb; | |
1c1e093c | 1601 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
eb6e199b SW |
1602 | dasd_add_request_tail(cqr); |
1603 | if (interruptible) { | |
1604 | rc = wait_event_interruptible( | |
1605 | generic_waitq, _wait_for_wakeup(cqr)); | |
1606 | if (rc == -ERESTARTSYS) { | |
1607 | dasd_cancel_req(cqr); | |
1608 | /* wait (non-interruptible) for final status */ | |
1609 | wait_event(generic_waitq, | |
1610 | _wait_for_wakeup(cqr)); | |
1611 | cqr->status = DASD_CQR_FAILED; | |
1612 | maincqr->intrc = rc; | |
1613 | continue; | |
1614 | } | |
1615 | } else | |
1616 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); | |
1617 | } | |
1618 | ||
1619 | maincqr->endclk = get_clock(); | |
1620 | if ((maincqr->status != DASD_CQR_DONE) && | |
1621 | (maincqr->intrc != -ERESTARTSYS)) | |
1622 | dasd_log_sense(maincqr, &maincqr->irb); | |
1623 | if (maincqr->status == DASD_CQR_DONE) | |
6cc7f168 | 1624 | rc = 0; |
eb6e199b SW |
1625 | else if (maincqr->intrc) |
1626 | rc = maincqr->intrc; | |
6cc7f168 SW |
1627 | else |
1628 | rc = -EIO; | |
1da177e4 LT |
1629 | return rc; |
1630 | } | |
1631 | ||
eb6e199b SW |
1632 | /* |
1633 | * Queue a request to the tail of the device ccw_queue and wait for | |
1634 | * it's completion. | |
1635 | */ | |
1636 | int dasd_sleep_on(struct dasd_ccw_req *cqr) | |
1637 | { | |
1638 | return _dasd_sleep_on(cqr, 0); | |
1639 | } | |
1640 | ||
1da177e4 | 1641 | /* |
8e09f215 SW |
1642 | * Queue a request to the tail of the device ccw_queue and wait |
1643 | * interruptible for it's completion. | |
1da177e4 | 1644 | */ |
8e09f215 | 1645 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1646 | { |
eb6e199b | 1647 | return _dasd_sleep_on(cqr, 1); |
1da177e4 LT |
1648 | } |
1649 | ||
1650 | /* | |
1651 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1652 | * for eckd devices) the currently running request has to be terminated | |
1653 | * and be put back to status queued, before the special request is added | |
1654 | * to the head of the queue. Then the special request is waited on normally. | |
1655 | */ | |
8e09f215 | 1656 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1657 | { |
1658 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1659 | |
1660 | if (list_empty(&device->ccw_queue)) | |
1661 | return 0; | |
8e09f215 | 1662 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1663 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1664 | } |
1665 | ||
8e09f215 | 1666 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1667 | { |
1da177e4 LT |
1668 | struct dasd_device *device; |
1669 | int rc; | |
138c014d | 1670 | |
8e09f215 | 1671 | device = cqr->startdev; |
1da177e4 LT |
1672 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1673 | rc = _dasd_term_running_cqr(device); | |
1674 | if (rc) { | |
1675 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1676 | return rc; | |
1677 | } | |
138c014d | 1678 | |
1da177e4 | 1679 | cqr->callback = dasd_wakeup_cb; |
1c1e093c | 1680 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
1da177e4 | 1681 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1682 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1683 | |
1da177e4 | 1684 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1685 | dasd_schedule_device_bh(device); |
138c014d | 1686 | |
1da177e4 LT |
1687 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1688 | ||
c80ee724 | 1689 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1690 | |
6cc7f168 SW |
1691 | if (cqr->status == DASD_CQR_DONE) |
1692 | rc = 0; | |
1693 | else if (cqr->intrc) | |
1694 | rc = cqr->intrc; | |
1695 | else | |
1696 | rc = -EIO; | |
1da177e4 LT |
1697 | return rc; |
1698 | } | |
1699 | ||
1700 | /* | |
1701 | * Cancels a request that was started with dasd_sleep_on_req. | |
1702 | * This is useful to timeout requests. The request will be | |
1703 | * terminated if it is currently in i/o. | |
1704 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1705 | * 0 if there was no need to terminate the request (not started yet) |
1706 | * negative error code if termination failed | |
1707 | * Cancellation of a request is an asynchronous operation! The calling | |
1708 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1709 | */ |
8e09f215 | 1710 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1711 | { |
8e09f215 | 1712 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1713 | unsigned long flags; |
1714 | int rc; | |
1715 | ||
1716 | rc = 0; | |
1717 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1718 | switch (cqr->status) { | |
1719 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1720 | /* request was not started - just set to cleared */ |
1721 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1722 | break; |
1723 | case DASD_CQR_IN_IO: | |
1724 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1725 | rc = device->discipline->term_IO(cqr); |
1726 | if (rc) { | |
fc19f381 SH |
1727 | dev_err(&device->cdev->dev, |
1728 | "Cancelling request %p failed with rc=%d\n", | |
1729 | cqr, rc); | |
8e09f215 SW |
1730 | } else { |
1731 | cqr->stopclk = get_clock(); | |
8e09f215 | 1732 | } |
1da177e4 | 1733 | break; |
8e09f215 | 1734 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1735 | break; |
8e09f215 SW |
1736 | } |
1737 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1738 | dasd_schedule_device_bh(device); | |
1739 | return rc; | |
1740 | } | |
1741 | ||
1742 | ||
1743 | /* | |
1744 | * SECTION: Operations of the dasd_block layer. | |
1745 | */ | |
1746 | ||
1747 | /* | |
1748 | * Timeout function for dasd_block. This is used when the block layer | |
1749 | * is waiting for something that may not come reliably, (e.g. a state | |
1750 | * change interrupt) | |
1751 | */ | |
1752 | static void dasd_block_timeout(unsigned long ptr) | |
1753 | { | |
1754 | unsigned long flags; | |
1755 | struct dasd_block *block; | |
1756 | ||
1757 | block = (struct dasd_block *) ptr; | |
1758 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1759 | /* re-activate request queue */ | |
eb6e199b | 1760 | dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); |
8e09f215 SW |
1761 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
1762 | dasd_schedule_block_bh(block); | |
1763 | } | |
1764 | ||
1765 | /* | |
1766 | * Setup timeout for a dasd_block in jiffies. | |
1767 | */ | |
1768 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1769 | { | |
48cae885 SW |
1770 | if (expires == 0) |
1771 | del_timer(&block->timer); | |
1772 | else | |
1773 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 SW |
1774 | } |
1775 | ||
1776 | /* | |
1777 | * Clear timeout for a dasd_block. | |
1778 | */ | |
1779 | void dasd_block_clear_timer(struct dasd_block *block) | |
1780 | { | |
48cae885 | 1781 | del_timer(&block->timer); |
8e09f215 SW |
1782 | } |
1783 | ||
8e09f215 SW |
1784 | /* |
1785 | * Process finished error recovery ccw. | |
1786 | */ | |
eb6e199b SW |
1787 | static void __dasd_process_erp(struct dasd_device *device, |
1788 | struct dasd_ccw_req *cqr) | |
8e09f215 SW |
1789 | { |
1790 | dasd_erp_fn_t erp_fn; | |
8e09f215 SW |
1791 | |
1792 | if (cqr->status == DASD_CQR_DONE) | |
1793 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1794 | else | |
fc19f381 | 1795 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
1796 | erp_fn = device->discipline->erp_postaction(cqr); |
1797 | erp_fn(cqr); | |
1798 | } | |
1da177e4 | 1799 | |
8e09f215 SW |
1800 | /* |
1801 | * Fetch requests from the block device queue. | |
1802 | */ | |
1803 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1804 | { | |
1805 | struct request_queue *queue; | |
1806 | struct request *req; | |
1807 | struct dasd_ccw_req *cqr; | |
1808 | struct dasd_device *basedev; | |
1809 | unsigned long flags; | |
1810 | queue = block->request_queue; | |
1811 | basedev = block->base; | |
1812 | /* No queue ? Then there is nothing to do. */ | |
1813 | if (queue == NULL) | |
1814 | return; | |
1815 | ||
1816 | /* | |
1817 | * We requeue request from the block device queue to the ccw | |
1818 | * queue only in two states. In state DASD_STATE_READY the | |
1819 | * partition detection is done and we need to requeue requests | |
1820 | * for that. State DASD_STATE_ONLINE is normal block device | |
1821 | * operation. | |
1822 | */ | |
97f604b0 SW |
1823 | if (basedev->state < DASD_STATE_READY) { |
1824 | while ((req = blk_fetch_request(block->request_queue))) | |
1825 | __blk_end_request_all(req, -EIO); | |
8e09f215 | 1826 | return; |
97f604b0 | 1827 | } |
8e09f215 | 1828 | /* Now we try to fetch requests from the request queue */ |
9934c8c0 | 1829 | while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) { |
8e09f215 SW |
1830 | if (basedev->features & DASD_FEATURE_READONLY && |
1831 | rq_data_dir(req) == WRITE) { | |
1832 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1833 | "Rejecting write request %p", | |
1834 | req); | |
9934c8c0 | 1835 | blk_start_request(req); |
40cbbb78 | 1836 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1837 | continue; |
1838 | } | |
1839 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1840 | if (IS_ERR(cqr)) { | |
1841 | if (PTR_ERR(cqr) == -EBUSY) | |
1842 | break; /* normal end condition */ | |
1843 | if (PTR_ERR(cqr) == -ENOMEM) | |
1844 | break; /* terminate request queue loop */ | |
1845 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1846 | /* | |
1847 | * The current request cannot be build right | |
1848 | * now, we have to try later. If this request | |
1849 | * is the head-of-queue we stop the device | |
1850 | * for 1/2 second. | |
1851 | */ | |
1852 | if (!list_empty(&block->ccw_queue)) | |
1853 | break; | |
eb6e199b SW |
1854 | spin_lock_irqsave( |
1855 | get_ccwdev_lock(basedev->cdev), flags); | |
1856 | dasd_device_set_stop_bits(basedev, | |
1857 | DASD_STOPPED_PENDING); | |
1858 | spin_unlock_irqrestore( | |
1859 | get_ccwdev_lock(basedev->cdev), flags); | |
8e09f215 SW |
1860 | dasd_block_set_timer(block, HZ/2); |
1861 | break; | |
1862 | } | |
1863 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1864 | "CCW creation failed (rc=%ld) " | |
1865 | "on request %p", | |
1866 | PTR_ERR(cqr), req); | |
9934c8c0 | 1867 | blk_start_request(req); |
40cbbb78 | 1868 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1869 | continue; |
1870 | } | |
1871 | /* | |
1872 | * Note: callback is set to dasd_return_cqr_cb in | |
1873 | * __dasd_block_start_head to cover erp requests as well | |
1874 | */ | |
1875 | cqr->callback_data = (void *) req; | |
1876 | cqr->status = DASD_CQR_FILLED; | |
9934c8c0 | 1877 | blk_start_request(req); |
8e09f215 SW |
1878 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
1879 | dasd_profile_start(block, cqr, req); | |
1880 | } | |
1881 | } | |
1882 | ||
1883 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1884 | { | |
1885 | struct request *req; | |
1886 | int status; | |
4c4e2148 | 1887 | int error = 0; |
8e09f215 SW |
1888 | |
1889 | req = (struct request *) cqr->callback_data; | |
1890 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1891 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1892 | if (status <= 0) |
1893 | error = status ? status : -EIO; | |
40cbbb78 | 1894 | __blk_end_request_all(req, error); |
8e09f215 SW |
1895 | } |
1896 | ||
1897 | /* | |
1898 | * Process ccw request queue. | |
1899 | */ | |
1900 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1901 | struct list_head *final_queue) | |
1902 | { | |
1903 | struct list_head *l, *n; | |
1904 | struct dasd_ccw_req *cqr; | |
1905 | dasd_erp_fn_t erp_fn; | |
1906 | unsigned long flags; | |
1907 | struct dasd_device *base = block->base; | |
1908 | ||
1909 | restart: | |
1910 | /* Process request with final status. */ | |
1911 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1912 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1913 | if (cqr->status != DASD_CQR_DONE && | |
1914 | cqr->status != DASD_CQR_FAILED && | |
1915 | cqr->status != DASD_CQR_NEED_ERP && | |
1916 | cqr->status != DASD_CQR_TERMINATED) | |
1917 | continue; | |
1918 | ||
1919 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1920 | base->discipline->handle_terminated_request(cqr); | |
1921 | goto restart; | |
1922 | } | |
1923 | ||
1924 | /* Process requests that may be recovered */ | |
1925 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 | 1926 | erp_fn = base->discipline->erp_action(cqr); |
6a5176c4 SH |
1927 | if (IS_ERR(erp_fn(cqr))) |
1928 | continue; | |
8e09f215 SW |
1929 | goto restart; |
1930 | } | |
1931 | ||
a9cffb22 SH |
1932 | /* log sense for fatal error */ |
1933 | if (cqr->status == DASD_CQR_FAILED) { | |
1934 | dasd_log_sense(cqr, &cqr->irb); | |
1935 | } | |
1936 | ||
8e09f215 SW |
1937 | /* First of all call extended error reporting. */ |
1938 | if (dasd_eer_enabled(base) && | |
1939 | cqr->status == DASD_CQR_FAILED) { | |
1940 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1941 | ||
1942 | /* restart request */ | |
1943 | cqr->status = DASD_CQR_FILLED; | |
1944 | cqr->retries = 255; | |
1945 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
eb6e199b | 1946 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 SW |
1947 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
1948 | flags); | |
1949 | goto restart; | |
1950 | } | |
1951 | ||
1952 | /* Process finished ERP request. */ | |
1953 | if (cqr->refers) { | |
eb6e199b | 1954 | __dasd_process_erp(base, cqr); |
8e09f215 SW |
1955 | goto restart; |
1956 | } | |
1957 | ||
1958 | /* Rechain finished requests to final queue */ | |
1959 | cqr->endclk = get_clock(); | |
1960 | list_move_tail(&cqr->blocklist, final_queue); | |
1961 | } | |
1962 | } | |
1963 | ||
1964 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1965 | { | |
1966 | dasd_schedule_block_bh(cqr->block); | |
1967 | } | |
1968 | ||
1969 | static void __dasd_block_start_head(struct dasd_block *block) | |
1970 | { | |
1971 | struct dasd_ccw_req *cqr; | |
1972 | ||
1973 | if (list_empty(&block->ccw_queue)) | |
1974 | return; | |
1975 | /* We allways begin with the first requests on the queue, as some | |
1976 | * of previously started requests have to be enqueued on a | |
1977 | * dasd_device again for error recovery. | |
1978 | */ | |
1979 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1980 | if (cqr->status != DASD_CQR_FILLED) | |
1981 | continue; | |
1982 | /* Non-temporary stop condition will trigger fail fast */ | |
1983 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1984 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1985 | (!dasd_eer_enabled(block->base))) { | |
1986 | cqr->status = DASD_CQR_FAILED; | |
1987 | dasd_schedule_block_bh(block); | |
1988 | continue; | |
1989 | } | |
1990 | /* Don't try to start requests if device is stopped */ | |
1991 | if (block->base->stopped) | |
1992 | return; | |
1993 | ||
1994 | /* just a fail safe check, should not happen */ | |
1995 | if (!cqr->startdev) | |
1996 | cqr->startdev = block->base; | |
1997 | ||
1998 | /* make sure that the requests we submit find their way back */ | |
1999 | cqr->callback = dasd_return_cqr_cb; | |
2000 | ||
2001 | dasd_add_request_tail(cqr); | |
2002 | } | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * Central dasd_block layer routine. Takes requests from the generic | |
2007 | * block layer request queue, creates ccw requests, enqueues them on | |
2008 | * a dasd_device and processes ccw requests that have been returned. | |
2009 | */ | |
2010 | static void dasd_block_tasklet(struct dasd_block *block) | |
2011 | { | |
2012 | struct list_head final_queue; | |
2013 | struct list_head *l, *n; | |
2014 | struct dasd_ccw_req *cqr; | |
2015 | ||
2016 | atomic_set(&block->tasklet_scheduled, 0); | |
2017 | INIT_LIST_HEAD(&final_queue); | |
2018 | spin_lock(&block->queue_lock); | |
2019 | /* Finish off requests on ccw queue */ | |
2020 | __dasd_process_block_ccw_queue(block, &final_queue); | |
2021 | spin_unlock(&block->queue_lock); | |
2022 | /* Now call the callback function of requests with final status */ | |
2023 | spin_lock_irq(&block->request_queue_lock); | |
2024 | list_for_each_safe(l, n, &final_queue) { | |
2025 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2026 | list_del_init(&cqr->blocklist); | |
2027 | __dasd_cleanup_cqr(cqr); | |
2028 | } | |
2029 | spin_lock(&block->queue_lock); | |
2030 | /* Get new request from the block device request queue */ | |
2031 | __dasd_process_request_queue(block); | |
2032 | /* Now check if the head of the ccw queue needs to be started. */ | |
2033 | __dasd_block_start_head(block); | |
2034 | spin_unlock(&block->queue_lock); | |
2035 | spin_unlock_irq(&block->request_queue_lock); | |
2036 | dasd_put_device(block->base); | |
2037 | } | |
2038 | ||
2039 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
2040 | { | |
2041 | wake_up(&dasd_flush_wq); | |
2042 | } | |
2043 | ||
2044 | /* | |
2045 | * Go through all request on the dasd_block request queue, cancel them | |
2046 | * on the respective dasd_device, and return them to the generic | |
2047 | * block layer. | |
2048 | */ | |
2049 | static int dasd_flush_block_queue(struct dasd_block *block) | |
2050 | { | |
2051 | struct dasd_ccw_req *cqr, *n; | |
2052 | int rc, i; | |
2053 | struct list_head flush_queue; | |
2054 | ||
2055 | INIT_LIST_HEAD(&flush_queue); | |
2056 | spin_lock_bh(&block->queue_lock); | |
2057 | rc = 0; | |
2058 | restart: | |
2059 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
2060 | /* if this request currently owned by a dasd_device cancel it */ | |
2061 | if (cqr->status >= DASD_CQR_QUEUED) | |
2062 | rc = dasd_cancel_req(cqr); | |
2063 | if (rc < 0) | |
2064 | break; | |
2065 | /* Rechain request (including erp chain) so it won't be | |
2066 | * touched by the dasd_block_tasklet anymore. | |
2067 | * Replace the callback so we notice when the request | |
2068 | * is returned from the dasd_device layer. | |
2069 | */ | |
2070 | cqr->callback = _dasd_wake_block_flush_cb; | |
2071 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
2072 | list_move_tail(&cqr->blocklist, &flush_queue); | |
2073 | if (i > 1) | |
2074 | /* moved more than one request - need to restart */ | |
2075 | goto restart; | |
2076 | } | |
2077 | spin_unlock_bh(&block->queue_lock); | |
2078 | /* Now call the callback function of flushed requests */ | |
2079 | restart_cb: | |
2080 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
2081 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
2082 | /* Process finished ERP request. */ | |
2083 | if (cqr->refers) { | |
0cd4bd47 | 2084 | spin_lock_bh(&block->queue_lock); |
eb6e199b | 2085 | __dasd_process_erp(block->base, cqr); |
0cd4bd47 | 2086 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
2087 | /* restart list_for_xx loop since dasd_process_erp |
2088 | * might remove multiple elements */ | |
2089 | goto restart_cb; | |
2090 | } | |
2091 | /* call the callback function */ | |
0cd4bd47 | 2092 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
2093 | cqr->endclk = get_clock(); |
2094 | list_del_init(&cqr->blocklist); | |
2095 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 2096 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 2097 | } |
1da177e4 LT |
2098 | return rc; |
2099 | } | |
2100 | ||
2101 | /* | |
8e09f215 SW |
2102 | * Schedules a call to dasd_tasklet over the device tasklet. |
2103 | */ | |
2104 | void dasd_schedule_block_bh(struct dasd_block *block) | |
2105 | { | |
2106 | /* Protect against rescheduling. */ | |
2107 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
2108 | return; | |
2109 | /* life cycle of block is bound to it's base device */ | |
2110 | dasd_get_device(block->base); | |
2111 | tasklet_hi_schedule(&block->tasklet); | |
2112 | } | |
2113 | ||
2114 | ||
2115 | /* | |
2116 | * SECTION: external block device operations | |
2117 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
2118 | */ |
2119 | ||
2120 | /* | |
2121 | * Dasd request queue function. Called from ll_rw_blk.c | |
2122 | */ | |
8e09f215 | 2123 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 2124 | { |
8e09f215 | 2125 | struct dasd_block *block; |
1da177e4 | 2126 | |
8e09f215 SW |
2127 | block = queue->queuedata; |
2128 | spin_lock(&block->queue_lock); | |
1da177e4 | 2129 | /* Get new request from the block device request queue */ |
8e09f215 | 2130 | __dasd_process_request_queue(block); |
1da177e4 | 2131 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2132 | __dasd_block_start_head(block); |
2133 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
2134 | } |
2135 | ||
2136 | /* | |
2137 | * Allocate and initialize request queue and default I/O scheduler. | |
2138 | */ | |
8e09f215 | 2139 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
2140 | { |
2141 | int rc; | |
2142 | ||
8e09f215 SW |
2143 | block->request_queue = blk_init_queue(do_dasd_request, |
2144 | &block->request_queue_lock); | |
2145 | if (block->request_queue == NULL) | |
1da177e4 LT |
2146 | return -ENOMEM; |
2147 | ||
8e09f215 | 2148 | block->request_queue->queuedata = block; |
1da177e4 | 2149 | |
8e09f215 | 2150 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 2151 | block->request_queue->elevator = NULL; |
8e09f215 | 2152 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 2153 | if (rc) { |
8e09f215 | 2154 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
2155 | return rc; |
2156 | } | |
2157 | return 0; | |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * Allocate and initialize request queue. | |
2162 | */ | |
8e09f215 | 2163 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
2164 | { |
2165 | int max; | |
2166 | ||
e1defc4f | 2167 | blk_queue_logical_block_size(block->request_queue, block->bp_block); |
8e09f215 | 2168 | max = block->base->discipline->max_blocks << block->s2b_shift; |
086fa5ff | 2169 | blk_queue_max_hw_sectors(block->request_queue, max); |
8a78362c | 2170 | blk_queue_max_segments(block->request_queue, -1L); |
f3eb5384 SW |
2171 | /* with page sized segments we can translate each segement into |
2172 | * one idaw/tidaw | |
2173 | */ | |
2174 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
2175 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
8e09f215 | 2176 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); |
1da177e4 LT |
2177 | } |
2178 | ||
2179 | /* | |
2180 | * Deactivate and free request queue. | |
2181 | */ | |
8e09f215 | 2182 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2183 | { |
8e09f215 SW |
2184 | if (block->request_queue) { |
2185 | blk_cleanup_queue(block->request_queue); | |
2186 | block->request_queue = NULL; | |
1da177e4 LT |
2187 | } |
2188 | } | |
2189 | ||
2190 | /* | |
2191 | * Flush request on the request queue. | |
2192 | */ | |
8e09f215 | 2193 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2194 | { |
2195 | struct request *req; | |
2196 | ||
8e09f215 | 2197 | if (!block->request_queue) |
1da177e4 | 2198 | return; |
138c014d | 2199 | |
8e09f215 | 2200 | spin_lock_irq(&block->request_queue_lock); |
9934c8c0 | 2201 | while ((req = blk_fetch_request(block->request_queue))) |
40cbbb78 | 2202 | __blk_end_request_all(req, -EIO); |
8e09f215 | 2203 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2204 | } |
2205 | ||
57a7c0bc | 2206 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2207 | { |
57a7c0bc | 2208 | struct dasd_block *block = bdev->bd_disk->private_data; |
9eb25122 | 2209 | struct dasd_device *base; |
1da177e4 LT |
2210 | int rc; |
2211 | ||
9eb25122 SH |
2212 | if (!block) |
2213 | return -ENODEV; | |
2214 | ||
2215 | base = block->base; | |
8e09f215 SW |
2216 | atomic_inc(&block->open_count); |
2217 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2218 | rc = -ENODEV; |
2219 | goto unlock; | |
2220 | } | |
2221 | ||
8e09f215 | 2222 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2223 | rc = -EINVAL; |
2224 | goto unlock; | |
2225 | } | |
2226 | ||
2227 | if (dasd_probeonly) { | |
fc19f381 SH |
2228 | dev_info(&base->cdev->dev, |
2229 | "Accessing the DASD failed because it is in " | |
2230 | "probeonly mode\n"); | |
1da177e4 LT |
2231 | rc = -EPERM; |
2232 | goto out; | |
2233 | } | |
2234 | ||
8e09f215 SW |
2235 | if (base->state <= DASD_STATE_BASIC) { |
2236 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2237 | " Cannot open unrecognized device"); |
2238 | rc = -ENODEV; | |
2239 | goto out; | |
2240 | } | |
2241 | ||
33b62a30 SW |
2242 | if ((mode & FMODE_WRITE) && |
2243 | (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || | |
2244 | (base->features & DASD_FEATURE_READONLY))) { | |
2245 | rc = -EROFS; | |
2246 | goto out; | |
2247 | } | |
2248 | ||
1da177e4 LT |
2249 | return 0; |
2250 | ||
2251 | out: | |
8e09f215 | 2252 | module_put(base->discipline->owner); |
1da177e4 | 2253 | unlock: |
8e09f215 | 2254 | atomic_dec(&block->open_count); |
1da177e4 LT |
2255 | return rc; |
2256 | } | |
2257 | ||
57a7c0bc | 2258 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2259 | { |
8e09f215 | 2260 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2261 | |
8e09f215 SW |
2262 | atomic_dec(&block->open_count); |
2263 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2264 | return 0; |
2265 | } | |
2266 | ||
a885c8c4 CH |
2267 | /* |
2268 | * Return disk geometry. | |
2269 | */ | |
8e09f215 | 2270 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2271 | { |
8e09f215 SW |
2272 | struct dasd_block *block; |
2273 | struct dasd_device *base; | |
a885c8c4 | 2274 | |
8e09f215 | 2275 | block = bdev->bd_disk->private_data; |
8e09f215 | 2276 | if (!block) |
a885c8c4 | 2277 | return -ENODEV; |
cf05b824 | 2278 | base = block->base; |
a885c8c4 | 2279 | |
8e09f215 SW |
2280 | if (!base->discipline || |
2281 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2282 | return -EINVAL; |
2283 | ||
8e09f215 SW |
2284 | base->discipline->fill_geometry(block, geo); |
2285 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2286 | return 0; |
2287 | } | |
2288 | ||
83d5cde4 | 2289 | const struct block_device_operations |
1da177e4 LT |
2290 | dasd_device_operations = { |
2291 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2292 | .open = dasd_open, |
2293 | .release = dasd_release, | |
0000d031 HC |
2294 | .ioctl = dasd_ioctl, |
2295 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 2296 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2297 | }; |
2298 | ||
8e09f215 SW |
2299 | /******************************************************************************* |
2300 | * end of block device operations | |
2301 | */ | |
1da177e4 LT |
2302 | |
2303 | static void | |
2304 | dasd_exit(void) | |
2305 | { | |
2306 | #ifdef CONFIG_PROC_FS | |
2307 | dasd_proc_exit(); | |
2308 | #endif | |
20c64468 | 2309 | dasd_eer_exit(); |
6bb0e010 HH |
2310 | if (dasd_page_cache != NULL) { |
2311 | kmem_cache_destroy(dasd_page_cache); | |
2312 | dasd_page_cache = NULL; | |
2313 | } | |
1da177e4 LT |
2314 | dasd_gendisk_exit(); |
2315 | dasd_devmap_exit(); | |
1da177e4 LT |
2316 | if (dasd_debug_area != NULL) { |
2317 | debug_unregister(dasd_debug_area); | |
2318 | dasd_debug_area = NULL; | |
2319 | } | |
2320 | } | |
2321 | ||
2322 | /* | |
2323 | * SECTION: common functions for ccw_driver use | |
2324 | */ | |
2325 | ||
33b62a30 SW |
2326 | /* |
2327 | * Is the device read-only? | |
2328 | * Note that this function does not report the setting of the | |
2329 | * readonly device attribute, but how it is configured in z/VM. | |
2330 | */ | |
2331 | int dasd_device_is_ro(struct dasd_device *device) | |
2332 | { | |
2333 | struct ccw_dev_id dev_id; | |
2334 | struct diag210 diag_data; | |
2335 | int rc; | |
2336 | ||
2337 | if (!MACHINE_IS_VM) | |
2338 | return 0; | |
2339 | ccw_device_get_id(device->cdev, &dev_id); | |
2340 | memset(&diag_data, 0, sizeof(diag_data)); | |
2341 | diag_data.vrdcdvno = dev_id.devno; | |
2342 | diag_data.vrdclen = sizeof(diag_data); | |
2343 | rc = diag210(&diag_data); | |
2344 | if (rc == 0 || rc == 2) { | |
2345 | return diag_data.vrdcvfla & 0x80; | |
2346 | } else { | |
2347 | DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", | |
2348 | dev_id.devno, rc); | |
2349 | return 0; | |
2350 | } | |
2351 | } | |
2352 | EXPORT_SYMBOL_GPL(dasd_device_is_ro); | |
2353 | ||
f3445a1a CH |
2354 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
2355 | { | |
2356 | struct ccw_device *cdev = data; | |
2357 | int ret; | |
2358 | ||
2359 | ret = ccw_device_set_online(cdev); | |
2360 | if (ret) | |
2361 | pr_warning("%s: Setting the DASD online failed with rc=%d\n", | |
2362 | dev_name(&cdev->dev), ret); | |
f3445a1a CH |
2363 | } |
2364 | ||
1c01b8a5 HH |
2365 | /* |
2366 | * Initial attempt at a probe function. this can be simplified once | |
2367 | * the other detection code is gone. | |
2368 | */ | |
8e09f215 SW |
2369 | int dasd_generic_probe(struct ccw_device *cdev, |
2370 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2371 | { |
2372 | int ret; | |
2373 | ||
2374 | ret = dasd_add_sysfs_files(cdev); | |
2375 | if (ret) { | |
b8ed5dd5 SH |
2376 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", |
2377 | "dasd_generic_probe: could not add " | |
2378 | "sysfs entries"); | |
40545573 | 2379 | return ret; |
1da177e4 | 2380 | } |
40545573 | 2381 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2382 | |
40545573 HH |
2383 | /* |
2384 | * Automatically online either all dasd devices (dasd_autodetect) | |
2385 | * or all devices specified with dasd= parameters during | |
2386 | * initial probe. | |
2387 | */ | |
2388 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2389 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 2390 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 2391 | return 0; |
1da177e4 LT |
2392 | } |
2393 | ||
1c01b8a5 HH |
2394 | /* |
2395 | * This will one day be called from a global not_oper handler. | |
2396 | * It is also used by driver_unregister during module unload. | |
2397 | */ | |
8e09f215 | 2398 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2399 | { |
2400 | struct dasd_device *device; | |
8e09f215 | 2401 | struct dasd_block *block; |
1da177e4 | 2402 | |
59afda78 HH |
2403 | cdev->handler = NULL; |
2404 | ||
1da177e4 LT |
2405 | dasd_remove_sysfs_files(cdev); |
2406 | device = dasd_device_from_cdev(cdev); | |
2407 | if (IS_ERR(device)) | |
2408 | return; | |
2409 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2410 | /* Already doing offline processing */ | |
2411 | dasd_put_device(device); | |
2412 | return; | |
2413 | } | |
2414 | /* | |
2415 | * This device is removed unconditionally. Set offline | |
2416 | * flag to prevent dasd_open from opening it while it is | |
2417 | * no quite down yet. | |
2418 | */ | |
2419 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2420 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2421 | block = device->block; |
2422 | device->block = NULL; | |
1da177e4 | 2423 | dasd_delete_device(device); |
8e09f215 SW |
2424 | /* |
2425 | * life cycle of block is bound to device, so delete it after | |
2426 | * device was safely removed | |
2427 | */ | |
2428 | if (block) | |
2429 | dasd_free_block(block); | |
1da177e4 LT |
2430 | } |
2431 | ||
1c01b8a5 HH |
2432 | /* |
2433 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2434 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2435 | * or the user has started activation through sysfs. |
2436 | */ | |
8e09f215 SW |
2437 | int dasd_generic_set_online(struct ccw_device *cdev, |
2438 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2439 | { |
aa88861f | 2440 | struct dasd_discipline *discipline; |
1da177e4 | 2441 | struct dasd_device *device; |
c6eb7b77 | 2442 | int rc; |
f24acd45 | 2443 | |
40545573 HH |
2444 | /* first online clears initial online feature flag */ |
2445 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2446 | device = dasd_create_device(cdev); |
2447 | if (IS_ERR(device)) | |
2448 | return PTR_ERR(device); | |
2449 | ||
aa88861f | 2450 | discipline = base_discipline; |
c6eb7b77 | 2451 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 2452 | if (!dasd_diag_discipline_pointer) { |
fc19f381 SH |
2453 | pr_warning("%s Setting the DASD online failed because " |
2454 | "of missing DIAG discipline\n", | |
2455 | dev_name(&cdev->dev)); | |
1da177e4 LT |
2456 | dasd_delete_device(device); |
2457 | return -ENODEV; | |
2458 | } | |
2459 | discipline = dasd_diag_discipline_pointer; | |
2460 | } | |
aa88861f PO |
2461 | if (!try_module_get(base_discipline->owner)) { |
2462 | dasd_delete_device(device); | |
2463 | return -EINVAL; | |
2464 | } | |
2465 | if (!try_module_get(discipline->owner)) { | |
2466 | module_put(base_discipline->owner); | |
2467 | dasd_delete_device(device); | |
2468 | return -EINVAL; | |
2469 | } | |
2470 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2471 | device->discipline = discipline; |
2472 | ||
8e09f215 | 2473 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2474 | rc = discipline->check_device(device); |
2475 | if (rc) { | |
fc19f381 SH |
2476 | pr_warning("%s Setting the DASD online with discipline %s " |
2477 | "failed with rc=%i\n", | |
2478 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
2479 | module_put(discipline->owner); |
2480 | module_put(base_discipline->owner); | |
1da177e4 LT |
2481 | dasd_delete_device(device); |
2482 | return rc; | |
2483 | } | |
2484 | ||
2485 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2486 | if (device->state <= DASD_STATE_KNOWN) { | |
fc19f381 SH |
2487 | pr_warning("%s Setting the DASD online failed because of a " |
2488 | "missing discipline\n", dev_name(&cdev->dev)); | |
1da177e4 LT |
2489 | rc = -ENODEV; |
2490 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2491 | if (device->block) |
2492 | dasd_free_block(device->block); | |
1da177e4 LT |
2493 | dasd_delete_device(device); |
2494 | } else | |
2495 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2496 | dev_name(&cdev->dev)); |
589c74d5 SH |
2497 | |
2498 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2499 | ||
1da177e4 | 2500 | dasd_put_device(device); |
1da177e4 LT |
2501 | return rc; |
2502 | } | |
2503 | ||
8e09f215 | 2504 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2505 | { |
2506 | struct dasd_device *device; | |
8e09f215 | 2507 | struct dasd_block *block; |
dafd87aa | 2508 | int max_count, open_count; |
1da177e4 LT |
2509 | |
2510 | device = dasd_device_from_cdev(cdev); | |
2511 | if (IS_ERR(device)) | |
2512 | return PTR_ERR(device); | |
2513 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2514 | /* Already doing offline processing */ | |
2515 | dasd_put_device(device); | |
2516 | return 0; | |
2517 | } | |
2518 | /* | |
2519 | * We must make sure that this device is currently not in use. | |
2520 | * The open_count is increased for every opener, that includes | |
2521 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2522 | * in the other openers. | |
2523 | */ | |
8e09f215 | 2524 | if (device->block) { |
a806170e HC |
2525 | max_count = device->block->bdev ? 0 : -1; |
2526 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2527 | if (open_count > max_count) { |
2528 | if (open_count > 0) | |
fc19f381 SH |
2529 | pr_warning("%s: The DASD cannot be set offline " |
2530 | "with open count %i\n", | |
2531 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 2532 | else |
fc19f381 SH |
2533 | pr_warning("%s: The DASD cannot be set offline " |
2534 | "while it is in use\n", | |
2535 | dev_name(&cdev->dev)); | |
8e09f215 SW |
2536 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2537 | dasd_put_device(device); | |
2538 | return -EBUSY; | |
2539 | } | |
1da177e4 LT |
2540 | } |
2541 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2542 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2543 | block = device->block; |
2544 | device->block = NULL; | |
1da177e4 | 2545 | dasd_delete_device(device); |
8e09f215 SW |
2546 | /* |
2547 | * life cycle of block is bound to device, so delete it after | |
2548 | * device was safely removed | |
2549 | */ | |
2550 | if (block) | |
2551 | dasd_free_block(block); | |
1da177e4 LT |
2552 | return 0; |
2553 | } | |
2554 | ||
8e09f215 | 2555 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2556 | { |
2557 | struct dasd_device *device; | |
2558 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
2559 | int ret; |
2560 | ||
91c36919 | 2561 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2562 | if (IS_ERR(device)) |
2563 | return 0; | |
1da177e4 LT |
2564 | ret = 0; |
2565 | switch (event) { | |
2566 | case CIO_GONE: | |
47593bfa | 2567 | case CIO_BOXED: |
1da177e4 | 2568 | case CIO_NO_PATH: |
20c64468 SW |
2569 | /* First of all call extended error reporting. */ |
2570 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2571 | ||
1da177e4 LT |
2572 | if (device->state < DASD_STATE_BASIC) |
2573 | break; | |
2574 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2575 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2576 | if (cqr->status == DASD_CQR_IN_IO) { | |
2577 | cqr->status = DASD_CQR_QUEUED; | |
2578 | cqr->retries++; | |
2579 | } | |
eb6e199b | 2580 | dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); |
8e09f215 SW |
2581 | dasd_device_clear_timer(device); |
2582 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2583 | ret = 1; |
2584 | break; | |
2585 | case CIO_OPER: | |
2586 | /* FIXME: add a sanity check. */ | |
eb6e199b | 2587 | dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); |
d41dd122 | 2588 | if (device->stopped & DASD_UNRESUMED_PM) { |
eb6e199b | 2589 | dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); |
d41dd122 SH |
2590 | dasd_restore_device(device); |
2591 | ret = 1; | |
2592 | break; | |
2593 | } | |
8e09f215 SW |
2594 | dasd_schedule_device_bh(device); |
2595 | if (device->block) | |
2596 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2597 | ret = 1; |
2598 | break; | |
2599 | } | |
1da177e4 LT |
2600 | dasd_put_device(device); |
2601 | return ret; | |
2602 | } | |
2603 | ||
d41dd122 SH |
2604 | int dasd_generic_pm_freeze(struct ccw_device *cdev) |
2605 | { | |
2606 | struct dasd_ccw_req *cqr, *n; | |
2607 | int rc; | |
2608 | struct list_head freeze_queue; | |
2609 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2610 | ||
2611 | if (IS_ERR(device)) | |
2612 | return PTR_ERR(device); | |
2613 | /* disallow new I/O */ | |
eb6e199b | 2614 | dasd_device_set_stop_bits(device, DASD_STOPPED_PM); |
d41dd122 SH |
2615 | /* clear active requests */ |
2616 | INIT_LIST_HEAD(&freeze_queue); | |
2617 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2618 | rc = 0; | |
2619 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { | |
2620 | /* Check status and move request to flush_queue */ | |
2621 | if (cqr->status == DASD_CQR_IN_IO) { | |
2622 | rc = device->discipline->term_IO(cqr); | |
2623 | if (rc) { | |
2624 | /* unable to terminate requeust */ | |
2625 | dev_err(&device->cdev->dev, | |
2626 | "Unable to terminate request %p " | |
2627 | "on suspend\n", cqr); | |
2628 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2629 | dasd_put_device(device); | |
2630 | return rc; | |
2631 | } | |
2632 | } | |
2633 | list_move_tail(&cqr->devlist, &freeze_queue); | |
2634 | } | |
2635 | ||
2636 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2637 | ||
2638 | list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { | |
2639 | wait_event(dasd_flush_wq, | |
2640 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
2641 | if (cqr->status == DASD_CQR_CLEARED) | |
2642 | cqr->status = DASD_CQR_QUEUED; | |
2643 | } | |
2644 | /* move freeze_queue to start of the ccw_queue */ | |
2645 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2646 | list_splice_tail(&freeze_queue, &device->ccw_queue); | |
2647 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2648 | ||
2649 | if (device->discipline->freeze) | |
2650 | rc = device->discipline->freeze(device); | |
2651 | ||
2652 | dasd_put_device(device); | |
2653 | return rc; | |
2654 | } | |
2655 | EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); | |
2656 | ||
2657 | int dasd_generic_restore_device(struct ccw_device *cdev) | |
2658 | { | |
2659 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2660 | int rc = 0; | |
2661 | ||
2662 | if (IS_ERR(device)) | |
2663 | return PTR_ERR(device); | |
2664 | ||
e6125fba | 2665 | /* allow new IO again */ |
eb6e199b SW |
2666 | dasd_device_remove_stop_bits(device, |
2667 | (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); | |
e6125fba | 2668 | |
d41dd122 | 2669 | dasd_schedule_device_bh(device); |
d41dd122 | 2670 | |
eb6e199b SW |
2671 | /* |
2672 | * call discipline restore function | |
2673 | * if device is stopped do nothing e.g. for disconnected devices | |
2674 | */ | |
2675 | if (device->discipline->restore && !(device->stopped)) | |
d41dd122 | 2676 | rc = device->discipline->restore(device); |
eb6e199b | 2677 | if (rc || device->stopped) |
e6125fba SH |
2678 | /* |
2679 | * if the resume failed for the DASD we put it in | |
2680 | * an UNRESUMED stop state | |
2681 | */ | |
2682 | device->stopped |= DASD_UNRESUMED_PM; | |
d41dd122 | 2683 | |
6fca97a9 SH |
2684 | if (device->block) |
2685 | dasd_schedule_block_bh(device->block); | |
2686 | ||
d41dd122 | 2687 | dasd_put_device(device); |
e6125fba | 2688 | return 0; |
d41dd122 SH |
2689 | } |
2690 | EXPORT_SYMBOL_GPL(dasd_generic_restore_device); | |
2691 | ||
763968e2 HC |
2692 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2693 | void *rdc_buffer, | |
2694 | int rdc_buffer_size, | |
68b781fe | 2695 | int magic) |
17283b56 CH |
2696 | { |
2697 | struct dasd_ccw_req *cqr; | |
2698 | struct ccw1 *ccw; | |
d9fa9441 | 2699 | unsigned long *idaw; |
17283b56 CH |
2700 | |
2701 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2702 | ||
2703 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
2704 | /* internal error 13 - Allocating the RDC request failed*/ |
2705 | dev_err(&device->cdev->dev, | |
2706 | "An error occurred in the DASD device driver, " | |
2707 | "reason=%s\n", "13"); | |
17283b56 CH |
2708 | return cqr; |
2709 | } | |
2710 | ||
2711 | ccw = cqr->cpaddr; | |
2712 | ccw->cmd_code = CCW_CMD_RDC; | |
d9fa9441 SH |
2713 | if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { |
2714 | idaw = (unsigned long *) (cqr->data); | |
2715 | ccw->cda = (__u32)(addr_t) idaw; | |
2716 | ccw->flags = CCW_FLAG_IDA; | |
2717 | idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); | |
2718 | } else { | |
2719 | ccw->cda = (__u32)(addr_t) rdc_buffer; | |
2720 | ccw->flags = 0; | |
2721 | } | |
17283b56 | 2722 | |
d9fa9441 | 2723 | ccw->count = rdc_buffer_size; |
8e09f215 SW |
2724 | cqr->startdev = device; |
2725 | cqr->memdev = device; | |
17283b56 | 2726 | cqr->expires = 10*HZ; |
eb6e199b | 2727 | cqr->retries = 256; |
17283b56 CH |
2728 | cqr->buildclk = get_clock(); |
2729 | cqr->status = DASD_CQR_FILLED; | |
2730 | return cqr; | |
2731 | } | |
2732 | ||
2733 | ||
68b781fe | 2734 | int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
92636b15 | 2735 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
2736 | { |
2737 | int ret; | |
2738 | struct dasd_ccw_req *cqr; | |
2739 | ||
92636b15 | 2740 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
2741 | magic); |
2742 | if (IS_ERR(cqr)) | |
2743 | return PTR_ERR(cqr); | |
2744 | ||
2745 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2746 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2747 | return ret; |
2748 | } | |
aaff0f64 | 2749 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2750 | |
f3eb5384 SW |
2751 | /* |
2752 | * In command mode and transport mode we need to look for sense | |
2753 | * data in different places. The sense data itself is allways | |
2754 | * an array of 32 bytes, so we can unify the sense data access | |
2755 | * for both modes. | |
2756 | */ | |
2757 | char *dasd_get_sense(struct irb *irb) | |
2758 | { | |
2759 | struct tsb *tsb = NULL; | |
2760 | char *sense = NULL; | |
2761 | ||
2762 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
2763 | if (irb->scsw.tm.tcw) | |
2764 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
2765 | irb->scsw.tm.tcw); | |
2766 | if (tsb && tsb->length == 64 && tsb->flags) | |
2767 | switch (tsb->flags & 0x07) { | |
2768 | case 1: /* tsa_iostat */ | |
2769 | sense = tsb->tsa.iostat.sense; | |
2770 | break; | |
2771 | case 2: /* tsa_ddpc */ | |
2772 | sense = tsb->tsa.ddpc.sense; | |
2773 | break; | |
2774 | default: | |
2775 | /* currently we don't use interrogate data */ | |
2776 | break; | |
2777 | } | |
2778 | } else if (irb->esw.esw0.erw.cons) { | |
2779 | sense = irb->ecw; | |
2780 | } | |
2781 | return sense; | |
2782 | } | |
2783 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
2784 | ||
8e09f215 | 2785 | static int __init dasd_init(void) |
1da177e4 LT |
2786 | { |
2787 | int rc; | |
2788 | ||
2789 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2790 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2791 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2792 | |
2793 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2794 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2795 | if (dasd_debug_area == NULL) { |
2796 | rc = -ENOMEM; | |
2797 | goto failed; | |
2798 | } | |
2799 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2800 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2801 | |
2802 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2803 | ||
2804 | dasd_diag_discipline_pointer = NULL; | |
2805 | ||
1da177e4 LT |
2806 | rc = dasd_devmap_init(); |
2807 | if (rc) | |
2808 | goto failed; | |
2809 | rc = dasd_gendisk_init(); | |
2810 | if (rc) | |
2811 | goto failed; | |
2812 | rc = dasd_parse(); | |
2813 | if (rc) | |
2814 | goto failed; | |
20c64468 SW |
2815 | rc = dasd_eer_init(); |
2816 | if (rc) | |
2817 | goto failed; | |
1da177e4 LT |
2818 | #ifdef CONFIG_PROC_FS |
2819 | rc = dasd_proc_init(); | |
2820 | if (rc) | |
2821 | goto failed; | |
2822 | #endif | |
2823 | ||
2824 | return 0; | |
2825 | failed: | |
fc19f381 | 2826 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
2827 | dasd_exit(); |
2828 | return rc; | |
2829 | } | |
2830 | ||
2831 | module_init(dasd_init); | |
2832 | module_exit(dasd_exit); | |
2833 | ||
2834 | EXPORT_SYMBOL(dasd_debug_area); | |
2835 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2836 | ||
2837 | EXPORT_SYMBOL(dasd_add_request_head); | |
2838 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2839 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2840 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2841 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2842 | EXPORT_SYMBOL(dasd_enable_device); |
2843 | EXPORT_SYMBOL(dasd_int_handler); | |
2844 | EXPORT_SYMBOL(dasd_kfree_request); | |
2845 | EXPORT_SYMBOL(dasd_kick_device); | |
2846 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2847 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2848 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2849 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2850 | EXPORT_SYMBOL(dasd_device_set_timer); |
2851 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2852 | EXPORT_SYMBOL(dasd_sfree_request); |
2853 | EXPORT_SYMBOL(dasd_sleep_on); | |
2854 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2855 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2856 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2857 | EXPORT_SYMBOL(dasd_start_IO); | |
2858 | EXPORT_SYMBOL(dasd_term_IO); | |
2859 | ||
2860 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2861 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2862 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2863 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2864 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2865 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2866 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2867 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2868 | EXPORT_SYMBOL_GPL(dasd_free_block); |