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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
d41dd122 | 8 | * Copyright IBM Corp. 1999, 2009 |
1da177e4 LT |
9 | */ |
10 | ||
fc19f381 SH |
11 | #define KMSG_COMPONENT "dasd" |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
1da177e4 LT |
14 | #include <linux/kmod.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/buffer_head.h> | |
a885c8c4 | 21 | #include <linux/hdreg.h> |
f3445a1a | 22 | #include <linux/async.h> |
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> |
1da177e4 LT |
29 | |
30 | /* This is ugly... */ | |
31 | #define PRINTK_HEADER "dasd:" | |
32 | ||
33 | #include "dasd_int.h" | |
34 | /* | |
35 | * SECTION: Constant definitions to be used within this file | |
36 | */ | |
37 | #define DASD_CHANQ_MAX_SIZE 4 | |
38 | ||
39 | /* | |
40 | * SECTION: exported variables of dasd.c | |
41 | */ | |
42 | debug_info_t *dasd_debug_area; | |
43 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 44 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
45 | |
46 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
47 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
48 | " Copyright 2000 IBM Corporation"); | |
49 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
50 | MODULE_LICENSE("GPL"); |
51 | ||
52 | /* | |
53 | * SECTION: prototypes for static functions of dasd.c | |
54 | */ | |
8e09f215 SW |
55 | static int dasd_alloc_queue(struct dasd_block *); |
56 | static void dasd_setup_queue(struct dasd_block *); | |
57 | static void dasd_free_queue(struct dasd_block *); | |
58 | static void dasd_flush_request_queue(struct dasd_block *); | |
59 | static int dasd_flush_block_queue(struct dasd_block *); | |
60 | static void dasd_device_tasklet(struct dasd_device *); | |
61 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 62 | static void do_kick_device(struct work_struct *); |
d41dd122 | 63 | static void do_restore_device(struct work_struct *); |
8e09f215 | 64 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
65 | static void dasd_device_timeout(unsigned long); |
66 | static void dasd_block_timeout(unsigned long); | |
eb6e199b | 67 | static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); |
1da177e4 LT |
68 | |
69 | /* | |
70 | * SECTION: Operations on the device structure. | |
71 | */ | |
72 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 73 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 74 | static wait_queue_head_t generic_waitq; |
1da177e4 LT |
75 | |
76 | /* | |
77 | * Allocate memory for a new device structure. | |
78 | */ | |
8e09f215 | 79 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
80 | { |
81 | struct dasd_device *device; | |
82 | ||
8e09f215 SW |
83 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
84 | if (!device) | |
1da177e4 | 85 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
86 | |
87 | /* Get two pages for normal block device operations. */ | |
88 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 89 | if (!device->ccw_mem) { |
1da177e4 LT |
90 | kfree(device); |
91 | return ERR_PTR(-ENOMEM); | |
92 | } | |
93 | /* Get one page for error recovery. */ | |
94 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 95 | if (!device->erp_mem) { |
1da177e4 LT |
96 | free_pages((unsigned long) device->ccw_mem, 1); |
97 | kfree(device); | |
98 | return ERR_PTR(-ENOMEM); | |
99 | } | |
100 | ||
101 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
102 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
103 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 104 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 105 | tasklet_init(&device->tasklet, |
8e09f215 | 106 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
107 | (unsigned long) device); |
108 | INIT_LIST_HEAD(&device->ccw_queue); | |
109 | init_timer(&device->timer); | |
48cae885 SW |
110 | device->timer.function = dasd_device_timeout; |
111 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 112 | INIT_WORK(&device->kick_work, do_kick_device); |
d41dd122 | 113 | INIT_WORK(&device->restore_device, do_restore_device); |
1da177e4 LT |
114 | device->state = DASD_STATE_NEW; |
115 | device->target = DASD_STATE_NEW; | |
9eb25122 | 116 | mutex_init(&device->state_mutex); |
1da177e4 LT |
117 | |
118 | return device; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Free memory of a device structure. | |
123 | */ | |
8e09f215 | 124 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 125 | { |
17fd682e | 126 | kfree(device->private); |
1da177e4 LT |
127 | free_page((unsigned long) device->erp_mem); |
128 | free_pages((unsigned long) device->ccw_mem, 1); | |
129 | kfree(device); | |
130 | } | |
131 | ||
8e09f215 SW |
132 | /* |
133 | * Allocate memory for a new device structure. | |
134 | */ | |
135 | struct dasd_block *dasd_alloc_block(void) | |
136 | { | |
137 | struct dasd_block *block; | |
138 | ||
139 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
140 | if (!block) | |
141 | return ERR_PTR(-ENOMEM); | |
142 | /* open_count = 0 means device online but not in use */ | |
143 | atomic_set(&block->open_count, -1); | |
144 | ||
145 | spin_lock_init(&block->request_queue_lock); | |
146 | atomic_set(&block->tasklet_scheduled, 0); | |
147 | tasklet_init(&block->tasklet, | |
148 | (void (*)(unsigned long)) dasd_block_tasklet, | |
149 | (unsigned long) block); | |
150 | INIT_LIST_HEAD(&block->ccw_queue); | |
151 | spin_lock_init(&block->queue_lock); | |
152 | init_timer(&block->timer); | |
48cae885 SW |
153 | block->timer.function = dasd_block_timeout; |
154 | block->timer.data = (unsigned long) block; | |
8e09f215 SW |
155 | |
156 | return block; | |
157 | } | |
158 | ||
159 | /* | |
160 | * Free memory of a device structure. | |
161 | */ | |
162 | void dasd_free_block(struct dasd_block *block) | |
163 | { | |
164 | kfree(block); | |
165 | } | |
166 | ||
1da177e4 LT |
167 | /* |
168 | * Make a new device known to the system. | |
169 | */ | |
8e09f215 | 170 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
171 | { |
172 | int rc; | |
173 | ||
174 | /* | |
138c014d | 175 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
176 | * keep the reference count > 0. |
177 | */ | |
178 | dasd_get_device(device); | |
179 | ||
8e09f215 SW |
180 | if (device->block) { |
181 | rc = dasd_alloc_queue(device->block); | |
182 | if (rc) { | |
183 | dasd_put_device(device); | |
184 | return rc; | |
185 | } | |
1da177e4 | 186 | } |
1da177e4 LT |
187 | device->state = DASD_STATE_KNOWN; |
188 | return 0; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Let the system forget about a device. | |
193 | */ | |
8e09f215 | 194 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 195 | { |
20c64468 SW |
196 | /* Disable extended error reporting for this device. */ |
197 | dasd_eer_disable(device); | |
1da177e4 | 198 | /* Forget the discipline information. */ |
8e09f215 SW |
199 | if (device->discipline) { |
200 | if (device->discipline->uncheck_device) | |
201 | device->discipline->uncheck_device(device); | |
aa88861f | 202 | module_put(device->discipline->owner); |
8e09f215 | 203 | } |
1da177e4 | 204 | device->discipline = NULL; |
aa88861f PO |
205 | if (device->base_discipline) |
206 | module_put(device->base_discipline->owner); | |
207 | device->base_discipline = NULL; | |
1da177e4 LT |
208 | device->state = DASD_STATE_NEW; |
209 | ||
8e09f215 SW |
210 | if (device->block) |
211 | dasd_free_queue(device->block); | |
1da177e4 LT |
212 | |
213 | /* Give up reference we took in dasd_state_new_to_known. */ | |
214 | dasd_put_device(device); | |
8f61701b | 215 | return 0; |
1da177e4 LT |
216 | } |
217 | ||
218 | /* | |
219 | * Request the irq line for the device. | |
220 | */ | |
8e09f215 | 221 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
222 | { |
223 | int rc; | |
224 | ||
225 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
226 | if (device->block) { |
227 | rc = dasd_gendisk_alloc(device->block); | |
228 | if (rc) | |
229 | return rc; | |
230 | } | |
1da177e4 | 231 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 232 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 233 | 8 * sizeof(long)); |
1da177e4 | 234 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 235 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
236 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
237 | ||
238 | device->state = DASD_STATE_BASIC; | |
239 | return 0; | |
240 | } | |
241 | ||
242 | /* | |
243 | * Release the irq line for the device. Terminate any running i/o. | |
244 | */ | |
8e09f215 | 245 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 246 | { |
8f61701b | 247 | int rc; |
8e09f215 SW |
248 | if (device->block) { |
249 | dasd_gendisk_free(device->block); | |
250 | dasd_block_clear_timer(device->block); | |
251 | } | |
252 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
253 | if (rc) |
254 | return rc; | |
8e09f215 | 255 | dasd_device_clear_timer(device); |
8f61701b | 256 | |
1da177e4 LT |
257 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
258 | if (device->debug_area != NULL) { | |
259 | debug_unregister(device->debug_area); | |
260 | device->debug_area = NULL; | |
261 | } | |
262 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 263 | return 0; |
1da177e4 LT |
264 | } |
265 | ||
266 | /* | |
267 | * Do the initial analysis. The do_analysis function may return | |
268 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
269 | * until the discipline decides to continue the startup sequence | |
270 | * by calling the function dasd_change_state. The eckd disciplines | |
271 | * uses this to start a ccw that detects the format. The completion | |
272 | * interrupt for this detection ccw uses the kernel event daemon to | |
273 | * trigger the call to dasd_change_state. All this is done in the | |
274 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
275 | * After the analysis ccw is done (do_analysis returned 0) the block |
276 | * device is setup. | |
277 | * In case the analysis returns an error, the device setup is stopped | |
278 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 279 | */ |
8e09f215 | 280 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
281 | { |
282 | int rc; | |
8e09f215 | 283 | struct dasd_block *block; |
1da177e4 LT |
284 | |
285 | rc = 0; | |
8e09f215 | 286 | block = device->block; |
90f0094d | 287 | /* make disk known with correct capacity */ |
8e09f215 SW |
288 | if (block) { |
289 | if (block->base->discipline->do_analysis != NULL) | |
290 | rc = block->base->discipline->do_analysis(block); | |
291 | if (rc) { | |
292 | if (rc != -EAGAIN) | |
293 | device->state = DASD_STATE_UNFMT; | |
294 | return rc; | |
295 | } | |
296 | dasd_setup_queue(block); | |
297 | set_capacity(block->gdp, | |
298 | block->blocks << block->s2b_shift); | |
299 | device->state = DASD_STATE_READY; | |
300 | rc = dasd_scan_partitions(block); | |
301 | if (rc) | |
302 | device->state = DASD_STATE_BASIC; | |
303 | } else { | |
304 | device->state = DASD_STATE_READY; | |
305 | } | |
90f0094d | 306 | return rc; |
1da177e4 LT |
307 | } |
308 | ||
309 | /* | |
310 | * Remove device from block device layer. Destroy dirty buffers. | |
311 | * Forget format information. Check if the target level is basic | |
312 | * and if it is create fake disk for formatting. | |
313 | */ | |
8e09f215 | 314 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 315 | { |
8f61701b HH |
316 | int rc; |
317 | ||
1da177e4 | 318 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
319 | if (device->block) { |
320 | struct dasd_block *block = device->block; | |
321 | rc = dasd_flush_block_queue(block); | |
322 | if (rc) { | |
323 | device->state = DASD_STATE_READY; | |
324 | return rc; | |
325 | } | |
326 | dasd_destroy_partitions(block); | |
327 | dasd_flush_request_queue(block); | |
328 | block->blocks = 0; | |
329 | block->bp_block = 0; | |
330 | block->s2b_shift = 0; | |
331 | } | |
8f61701b | 332 | return 0; |
1da177e4 LT |
333 | } |
334 | ||
90f0094d HH |
335 | /* |
336 | * Back to basic. | |
337 | */ | |
8e09f215 | 338 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
339 | { |
340 | device->state = DASD_STATE_BASIC; | |
8f61701b | 341 | return 0; |
90f0094d HH |
342 | } |
343 | ||
1da177e4 LT |
344 | /* |
345 | * Make the device online and schedule the bottom half to start | |
346 | * the requeueing of requests from the linux request queue to the | |
347 | * ccw queue. | |
348 | */ | |
8f61701b | 349 | static int |
1da177e4 LT |
350 | dasd_state_ready_to_online(struct dasd_device * device) |
351 | { | |
8e09f215 | 352 | int rc; |
1301809b SW |
353 | struct gendisk *disk; |
354 | struct disk_part_iter piter; | |
355 | struct hd_struct *part; | |
8e09f215 SW |
356 | |
357 | if (device->discipline->ready_to_online) { | |
358 | rc = device->discipline->ready_to_online(device); | |
359 | if (rc) | |
360 | return rc; | |
361 | } | |
1da177e4 | 362 | device->state = DASD_STATE_ONLINE; |
1301809b | 363 | if (device->block) { |
8e09f215 | 364 | dasd_schedule_block_bh(device->block); |
1301809b SW |
365 | disk = device->block->bdev->bd_disk; |
366 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
367 | while ((part = disk_part_iter_next(&piter))) | |
368 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
369 | disk_part_iter_exit(&piter); | |
370 | } | |
1da177e4 LT |
371 | return 0; |
372 | } | |
373 | ||
374 | /* | |
375 | * Stop the requeueing of requests again. | |
376 | */ | |
8e09f215 | 377 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 378 | { |
8e09f215 | 379 | int rc; |
1301809b SW |
380 | struct gendisk *disk; |
381 | struct disk_part_iter piter; | |
382 | struct hd_struct *part; | |
8e09f215 SW |
383 | |
384 | if (device->discipline->online_to_ready) { | |
385 | rc = device->discipline->online_to_ready(device); | |
386 | if (rc) | |
387 | return rc; | |
388 | } | |
1da177e4 | 389 | device->state = DASD_STATE_READY; |
1301809b SW |
390 | if (device->block) { |
391 | disk = device->block->bdev->bd_disk; | |
392 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
393 | while ((part = disk_part_iter_next(&piter))) | |
394 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
395 | disk_part_iter_exit(&piter); | |
396 | } | |
8f61701b | 397 | return 0; |
1da177e4 LT |
398 | } |
399 | ||
400 | /* | |
401 | * Device startup state changes. | |
402 | */ | |
8e09f215 | 403 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
404 | { |
405 | int rc; | |
406 | ||
407 | rc = 0; | |
408 | if (device->state == DASD_STATE_NEW && | |
409 | device->target >= DASD_STATE_KNOWN) | |
410 | rc = dasd_state_new_to_known(device); | |
411 | ||
412 | if (!rc && | |
413 | device->state == DASD_STATE_KNOWN && | |
414 | device->target >= DASD_STATE_BASIC) | |
415 | rc = dasd_state_known_to_basic(device); | |
416 | ||
417 | if (!rc && | |
418 | device->state == DASD_STATE_BASIC && | |
419 | device->target >= DASD_STATE_READY) | |
420 | rc = dasd_state_basic_to_ready(device); | |
421 | ||
39ccf95e HH |
422 | if (!rc && |
423 | device->state == DASD_STATE_UNFMT && | |
424 | device->target > DASD_STATE_UNFMT) | |
425 | rc = -EPERM; | |
426 | ||
1da177e4 LT |
427 | if (!rc && |
428 | device->state == DASD_STATE_READY && | |
429 | device->target >= DASD_STATE_ONLINE) | |
430 | rc = dasd_state_ready_to_online(device); | |
431 | ||
432 | return rc; | |
433 | } | |
434 | ||
435 | /* | |
436 | * Device shutdown state changes. | |
437 | */ | |
8e09f215 | 438 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 439 | { |
8f61701b HH |
440 | int rc; |
441 | ||
442 | rc = 0; | |
1da177e4 LT |
443 | if (device->state == DASD_STATE_ONLINE && |
444 | device->target <= DASD_STATE_READY) | |
8f61701b | 445 | rc = dasd_state_online_to_ready(device); |
138c014d | 446 | |
8f61701b HH |
447 | if (!rc && |
448 | device->state == DASD_STATE_READY && | |
1da177e4 | 449 | device->target <= DASD_STATE_BASIC) |
8f61701b | 450 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 451 | |
8f61701b HH |
452 | if (!rc && |
453 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 454 | device->target <= DASD_STATE_BASIC) |
8f61701b | 455 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 456 | |
8f61701b HH |
457 | if (!rc && |
458 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 459 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 460 | rc = dasd_state_basic_to_known(device); |
138c014d | 461 | |
8f61701b HH |
462 | if (!rc && |
463 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 464 | device->target <= DASD_STATE_NEW) |
8f61701b | 465 | rc = dasd_state_known_to_new(device); |
1da177e4 | 466 | |
8f61701b | 467 | return rc; |
1da177e4 LT |
468 | } |
469 | ||
470 | /* | |
471 | * This is the main startup/shutdown routine. | |
472 | */ | |
8e09f215 | 473 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 | 474 | { |
181d9522 | 475 | int rc; |
1da177e4 LT |
476 | |
477 | if (device->state == device->target) | |
478 | /* Already where we want to go today... */ | |
479 | return; | |
480 | if (device->state < device->target) | |
481 | rc = dasd_increase_state(device); | |
482 | else | |
483 | rc = dasd_decrease_state(device); | |
181d9522 SO |
484 | if (rc == -EAGAIN) |
485 | return; | |
486 | if (rc) | |
487 | device->target = device->state; | |
1da177e4 | 488 | |
9eb25122 | 489 | if (device->state == device->target) |
1da177e4 | 490 | wake_up(&dasd_init_waitq); |
4dfd5c45 HH |
491 | |
492 | /* let user-space know that the device status changed */ | |
493 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
494 | } |
495 | ||
496 | /* | |
497 | * Kick starter for devices that did not complete the startup/shutdown | |
498 | * procedure or were sleeping because of a pending state. | |
499 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
500 | * event daemon. | |
501 | */ | |
8e09f215 | 502 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 503 | { |
4927b3f7 | 504 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
9eb25122 | 505 | mutex_lock(&device->state_mutex); |
1da177e4 | 506 | dasd_change_state(device); |
9eb25122 | 507 | mutex_unlock(&device->state_mutex); |
8e09f215 | 508 | dasd_schedule_device_bh(device); |
1da177e4 LT |
509 | dasd_put_device(device); |
510 | } | |
511 | ||
8e09f215 | 512 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
513 | { |
514 | dasd_get_device(device); | |
515 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
516 | schedule_work(&device->kick_work); | |
517 | } | |
518 | ||
d41dd122 SH |
519 | /* |
520 | * dasd_restore_device will schedule a call do do_restore_device to the kernel | |
521 | * event daemon. | |
522 | */ | |
523 | static void do_restore_device(struct work_struct *work) | |
524 | { | |
525 | struct dasd_device *device = container_of(work, struct dasd_device, | |
526 | restore_device); | |
527 | device->cdev->drv->restore(device->cdev); | |
528 | dasd_put_device(device); | |
529 | } | |
530 | ||
531 | void dasd_restore_device(struct dasd_device *device) | |
532 | { | |
533 | dasd_get_device(device); | |
534 | /* queue call to dasd_restore_device to the kernel event daemon. */ | |
535 | schedule_work(&device->restore_device); | |
536 | } | |
537 | ||
1da177e4 LT |
538 | /* |
539 | * Set the target state for a device and starts the state change. | |
540 | */ | |
8e09f215 | 541 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 542 | { |
f3445a1a | 543 | dasd_get_device(device); |
9eb25122 | 544 | mutex_lock(&device->state_mutex); |
1da177e4 LT |
545 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
546 | if (dasd_probeonly && target > DASD_STATE_READY) | |
547 | target = DASD_STATE_READY; | |
548 | if (device->target != target) { | |
9eb25122 | 549 | if (device->state == target) |
1da177e4 LT |
550 | wake_up(&dasd_init_waitq); |
551 | device->target = target; | |
552 | } | |
553 | if (device->state != device->target) | |
554 | dasd_change_state(device); | |
9eb25122 SH |
555 | mutex_unlock(&device->state_mutex); |
556 | dasd_put_device(device); | |
1da177e4 LT |
557 | } |
558 | ||
559 | /* | |
560 | * Enable devices with device numbers in [from..to]. | |
561 | */ | |
8e09f215 | 562 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
563 | { |
564 | return (device->state == device->target); | |
565 | } | |
566 | ||
8e09f215 | 567 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
568 | { |
569 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
570 | if (device->state <= DASD_STATE_KNOWN) | |
571 | /* No discipline for device found. */ | |
572 | dasd_set_target_state(device, DASD_STATE_NEW); | |
573 | /* Now wait for the devices to come up. */ | |
574 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
575 | } | |
576 | ||
577 | /* | |
578 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
579 | */ | |
580 | #ifdef CONFIG_DASD_PROFILE | |
581 | ||
582 | struct dasd_profile_info_t dasd_global_profile; | |
583 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
584 | ||
585 | /* | |
586 | * Increments counter in global and local profiling structures. | |
587 | */ | |
8e09f215 | 588 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
589 | { \ |
590 | int index; \ | |
591 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
592 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 593 | block->profile.counter[index]++; \ |
1da177e4 LT |
594 | } |
595 | ||
596 | /* | |
597 | * Add profiling information for cqr before execution. | |
598 | */ | |
8e09f215 SW |
599 | static void dasd_profile_start(struct dasd_block *block, |
600 | struct dasd_ccw_req *cqr, | |
601 | struct request *req) | |
1da177e4 LT |
602 | { |
603 | struct list_head *l; | |
604 | unsigned int counter; | |
605 | ||
606 | if (dasd_profile_level != DASD_PROFILE_ON) | |
607 | return; | |
608 | ||
609 | /* count the length of the chanq for statistics */ | |
610 | counter = 0; | |
8e09f215 | 611 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
612 | if (++counter >= 31) |
613 | break; | |
614 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 615 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
616 | } |
617 | ||
618 | /* | |
619 | * Add profiling information for cqr after execution. | |
620 | */ | |
8e09f215 SW |
621 | static void dasd_profile_end(struct dasd_block *block, |
622 | struct dasd_ccw_req *cqr, | |
623 | struct request *req) | |
1da177e4 LT |
624 | { |
625 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
626 | long tottimeps, sectors; | |
627 | ||
628 | if (dasd_profile_level != DASD_PROFILE_ON) | |
629 | return; | |
630 | ||
83096ebf | 631 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
632 | if (!cqr->buildclk || !cqr->startclk || |
633 | !cqr->stopclk || !cqr->endclk || | |
634 | !sectors) | |
635 | return; | |
636 | ||
637 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
638 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
639 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
640 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
641 | tottimeps = tottime / sectors; | |
642 | ||
643 | if (!dasd_global_profile.dasd_io_reqs) | |
644 | memset(&dasd_global_profile, 0, | |
8e09f215 | 645 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
646 | dasd_global_profile.dasd_io_reqs++; |
647 | dasd_global_profile.dasd_io_sects += sectors; | |
648 | ||
8e09f215 SW |
649 | if (!block->profile.dasd_io_reqs) |
650 | memset(&block->profile, 0, | |
651 | sizeof(struct dasd_profile_info_t)); | |
652 | block->profile.dasd_io_reqs++; | |
653 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 654 | |
8e09f215 SW |
655 | dasd_profile_counter(sectors, dasd_io_secs, block); |
656 | dasd_profile_counter(tottime, dasd_io_times, block); | |
657 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
658 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
659 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
660 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
661 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
662 | } |
663 | #else | |
8e09f215 SW |
664 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
665 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
666 | #endif /* CONFIG_DASD_PROFILE */ |
667 | ||
668 | /* | |
669 | * Allocate memory for a channel program with 'cplength' channel | |
670 | * command words and 'datasize' additional space. There are two | |
671 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
672 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
673 | * that gets allocated for each device. | |
674 | */ | |
68b781fe | 675 | struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, |
8e09f215 SW |
676 | int datasize, |
677 | struct dasd_device *device) | |
1da177e4 LT |
678 | { |
679 | struct dasd_ccw_req *cqr; | |
680 | ||
681 | /* Sanity checks */ | |
68b781fe | 682 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 683 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 | 684 | |
88abaab4 | 685 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
686 | if (cqr == NULL) |
687 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
688 | cqr->cpaddr = NULL; |
689 | if (cplength > 0) { | |
88abaab4 | 690 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
691 | GFP_ATOMIC | GFP_DMA); |
692 | if (cqr->cpaddr == NULL) { | |
693 | kfree(cqr); | |
694 | return ERR_PTR(-ENOMEM); | |
695 | } | |
1da177e4 LT |
696 | } |
697 | cqr->data = NULL; | |
698 | if (datasize > 0) { | |
88abaab4 | 699 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 700 | if (cqr->data == NULL) { |
17fd682e | 701 | kfree(cqr->cpaddr); |
1da177e4 LT |
702 | kfree(cqr); |
703 | return ERR_PTR(-ENOMEM); | |
704 | } | |
1da177e4 | 705 | } |
68b781fe | 706 | cqr->magic = magic; |
1da177e4 LT |
707 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
708 | dasd_get_device(device); | |
709 | return cqr; | |
710 | } | |
711 | ||
68b781fe | 712 | struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
8e09f215 SW |
713 | int datasize, |
714 | struct dasd_device *device) | |
1da177e4 LT |
715 | { |
716 | unsigned long flags; | |
717 | struct dasd_ccw_req *cqr; | |
718 | char *data; | |
719 | int size; | |
720 | ||
721 | /* Sanity checks */ | |
68b781fe | 722 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 723 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 LT |
724 | |
725 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
726 | if (cplength > 0) | |
727 | size += cplength * sizeof(struct ccw1); | |
728 | if (datasize > 0) | |
729 | size += datasize; | |
730 | spin_lock_irqsave(&device->mem_lock, flags); | |
731 | cqr = (struct dasd_ccw_req *) | |
732 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
733 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
734 | if (cqr == NULL) | |
735 | return ERR_PTR(-ENOMEM); | |
736 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
737 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
738 | cqr->cpaddr = NULL; | |
739 | if (cplength > 0) { | |
740 | cqr->cpaddr = (struct ccw1 *) data; | |
741 | data += cplength*sizeof(struct ccw1); | |
742 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
743 | } | |
744 | cqr->data = NULL; | |
745 | if (datasize > 0) { | |
746 | cqr->data = data; | |
747 | memset(cqr->data, 0, datasize); | |
748 | } | |
68b781fe | 749 | cqr->magic = magic; |
1da177e4 LT |
750 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
751 | dasd_get_device(device); | |
752 | return cqr; | |
753 | } | |
754 | ||
755 | /* | |
756 | * Free memory of a channel program. This function needs to free all the | |
757 | * idal lists that might have been created by dasd_set_cda and the | |
758 | * struct dasd_ccw_req itself. | |
759 | */ | |
8e09f215 | 760 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 761 | { |
347a8dc3 | 762 | #ifdef CONFIG_64BIT |
1da177e4 LT |
763 | struct ccw1 *ccw; |
764 | ||
765 | /* Clear any idals used for the request. */ | |
766 | ccw = cqr->cpaddr; | |
767 | do { | |
768 | clear_normalized_cda(ccw); | |
769 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
770 | #endif | |
17fd682e JJ |
771 | kfree(cqr->cpaddr); |
772 | kfree(cqr->data); | |
1da177e4 LT |
773 | kfree(cqr); |
774 | dasd_put_device(device); | |
775 | } | |
776 | ||
8e09f215 | 777 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
778 | { |
779 | unsigned long flags; | |
780 | ||
781 | spin_lock_irqsave(&device->mem_lock, flags); | |
782 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
783 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
784 | dasd_put_device(device); | |
785 | } | |
786 | ||
787 | /* | |
788 | * Check discipline magic in cqr. | |
789 | */ | |
8e09f215 | 790 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
791 | { |
792 | struct dasd_device *device; | |
793 | ||
794 | if (cqr == NULL) | |
795 | return -EINVAL; | |
8e09f215 | 796 | device = cqr->startdev; |
1da177e4 | 797 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 798 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
799 | " dasd_ccw_req 0x%08x magic doesn't match" |
800 | " discipline 0x%08x", | |
801 | cqr->magic, | |
802 | *(unsigned int *) device->discipline->name); | |
803 | return -EINVAL; | |
804 | } | |
805 | return 0; | |
806 | } | |
807 | ||
808 | /* | |
809 | * Terminate the current i/o and set the request to clear_pending. | |
810 | * Timer keeps device runnig. | |
811 | * ccw_device_clear can fail if the i/o subsystem | |
812 | * is in a bad mood. | |
813 | */ | |
8e09f215 | 814 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
815 | { |
816 | struct dasd_device *device; | |
817 | int retries, rc; | |
fc19f381 | 818 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
819 | |
820 | /* Check the cqr */ | |
821 | rc = dasd_check_cqr(cqr); | |
822 | if (rc) | |
823 | return rc; | |
824 | retries = 0; | |
8e09f215 | 825 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
826 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
827 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
828 | switch (rc) { | |
829 | case 0: /* termination successful */ | |
c2ba444d | 830 | cqr->retries--; |
8e09f215 | 831 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 832 | cqr->stopclk = get_clock(); |
8f61701b | 833 | cqr->starttime = 0; |
1da177e4 LT |
834 | DBF_DEV_EVENT(DBF_DEBUG, device, |
835 | "terminate cqr %p successful", | |
836 | cqr); | |
837 | break; | |
838 | case -ENODEV: | |
839 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
840 | "device gone, retry"); | |
841 | break; | |
842 | case -EIO: | |
843 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
844 | "I/O error, retry"); | |
845 | break; | |
846 | case -EINVAL: | |
847 | case -EBUSY: | |
848 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
849 | "device busy, retry later"); | |
850 | break; | |
851 | default: | |
fc19f381 SH |
852 | /* internal error 10 - unknown rc*/ |
853 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
854 | dev_err(&device->cdev->dev, "An error occurred in the " | |
855 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
856 | BUG(); |
857 | break; | |
858 | } | |
859 | retries++; | |
860 | } | |
8e09f215 | 861 | dasd_schedule_device_bh(device); |
1da177e4 LT |
862 | return rc; |
863 | } | |
864 | ||
865 | /* | |
866 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
867 | * In that case set up a timer to start the request later. | |
868 | */ | |
8e09f215 | 869 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
870 | { |
871 | struct dasd_device *device; | |
872 | int rc; | |
fc19f381 | 873 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
874 | |
875 | /* Check the cqr */ | |
876 | rc = dasd_check_cqr(cqr); | |
6cc7f168 SW |
877 | if (rc) { |
878 | cqr->intrc = rc; | |
1da177e4 | 879 | return rc; |
6cc7f168 | 880 | } |
8e09f215 | 881 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 882 | if (cqr->retries < 0) { |
fc19f381 SH |
883 | /* internal error 14 - start_IO run out of retries */ |
884 | sprintf(errorstring, "14 %p", cqr); | |
885 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
886 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 887 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
888 | return -EIO; |
889 | } | |
890 | cqr->startclk = get_clock(); | |
891 | cqr->starttime = jiffies; | |
892 | cqr->retries--; | |
f3eb5384 SW |
893 | if (cqr->cpmode == 1) { |
894 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
895 | (long) cqr, cqr->lpm); | |
896 | } else { | |
897 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
898 | (long) cqr, cqr->lpm, 0); | |
899 | } | |
1da177e4 LT |
900 | switch (rc) { |
901 | case 0: | |
902 | cqr->status = DASD_CQR_IN_IO; | |
1da177e4 LT |
903 | break; |
904 | case -EBUSY: | |
fc19f381 | 905 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
906 | "start_IO: device busy, retry later"); |
907 | break; | |
908 | case -ETIMEDOUT: | |
fc19f381 | 909 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
910 | "start_IO: request timeout, retry later"); |
911 | break; | |
912 | case -EACCES: | |
913 | /* -EACCES indicates that the request used only a | |
914 | * subset of the available pathes and all these | |
915 | * pathes are gone. | |
916 | * Do a retry with all available pathes. | |
917 | */ | |
918 | cqr->lpm = LPM_ANYPATH; | |
fc19f381 | 919 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1da177e4 LT |
920 | "start_IO: selected pathes gone," |
921 | " retry on all pathes"); | |
922 | break; | |
923 | case -ENODEV: | |
f3eb5384 SW |
924 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
925 | "start_IO: -ENODEV device gone, retry"); | |
926 | break; | |
1da177e4 | 927 | case -EIO: |
fc19f381 | 928 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
f3eb5384 | 929 | "start_IO: -EIO device gone, retry"); |
1da177e4 | 930 | break; |
d41dd122 SH |
931 | case -EINVAL: |
932 | /* most likely caused in power management context */ | |
933 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", | |
934 | "start_IO: -EINVAL device currently " | |
935 | "not accessible"); | |
936 | break; | |
1da177e4 | 937 | default: |
fc19f381 SH |
938 | /* internal error 11 - unknown rc */ |
939 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
940 | dev_err(&device->cdev->dev, | |
941 | "An error occurred in the DASD device driver, " | |
942 | "reason=%s\n", errorstring); | |
1da177e4 LT |
943 | BUG(); |
944 | break; | |
945 | } | |
6cc7f168 | 946 | cqr->intrc = rc; |
1da177e4 LT |
947 | return rc; |
948 | } | |
949 | ||
950 | /* | |
951 | * Timeout function for dasd devices. This is used for different purposes | |
952 | * 1) missing interrupt handler for normal operation | |
953 | * 2) delayed start of request where start_IO failed with -EBUSY | |
954 | * 3) timeout for missing state change interrupts | |
955 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
956 | * DASD_CQR_QUEUED for 2) and 3). | |
957 | */ | |
8e09f215 | 958 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
959 | { |
960 | unsigned long flags; | |
961 | struct dasd_device *device; | |
962 | ||
963 | device = (struct dasd_device *) ptr; | |
964 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
965 | /* re-activate request queue */ | |
eb6e199b | 966 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
1da177e4 | 967 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
8e09f215 | 968 | dasd_schedule_device_bh(device); |
1da177e4 LT |
969 | } |
970 | ||
971 | /* | |
972 | * Setup timeout for a device in jiffies. | |
973 | */ | |
8e09f215 | 974 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 975 | { |
48cae885 SW |
976 | if (expires == 0) |
977 | del_timer(&device->timer); | |
978 | else | |
979 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 LT |
980 | } |
981 | ||
982 | /* | |
983 | * Clear timeout for a device. | |
984 | */ | |
8e09f215 | 985 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 986 | { |
48cae885 | 987 | del_timer(&device->timer); |
1da177e4 LT |
988 | } |
989 | ||
8e09f215 SW |
990 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
991 | unsigned long intparm) | |
1da177e4 LT |
992 | { |
993 | struct dasd_ccw_req *cqr; | |
994 | struct dasd_device *device; | |
995 | ||
f16f5843 SW |
996 | if (!intparm) |
997 | return; | |
1da177e4 LT |
998 | cqr = (struct dasd_ccw_req *) intparm; |
999 | if (cqr->status != DASD_CQR_IN_IO) { | |
b8ed5dd5 SH |
1000 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, |
1001 | "invalid status in handle_killed_request: " | |
1002 | "%02x", cqr->status); | |
1da177e4 LT |
1003 | return; |
1004 | } | |
1005 | ||
589c74d5 SH |
1006 | device = dasd_device_from_cdev_locked(cdev); |
1007 | if (IS_ERR(device)) { | |
1008 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", | |
1009 | "unable to get device from cdev"); | |
1010 | return; | |
1011 | } | |
1012 | ||
1013 | if (!cqr->startdev || | |
1014 | device != cqr->startdev || | |
1015 | strncmp(cqr->startdev->discipline->ebcname, | |
1016 | (char *) &cqr->magic, 4)) { | |
294001a8 SH |
1017 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1018 | "invalid device in request"); | |
589c74d5 | 1019 | dasd_put_device(device); |
1da177e4 LT |
1020 | return; |
1021 | } | |
1022 | ||
1023 | /* Schedule request to be retried. */ | |
1024 | cqr->status = DASD_CQR_QUEUED; | |
1025 | ||
8e09f215 SW |
1026 | dasd_device_clear_timer(device); |
1027 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1028 | dasd_put_device(device); |
1029 | } | |
1030 | ||
8e09f215 | 1031 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 1032 | { |
20c64468 SW |
1033 | /* First of all start sense subsystem status request. */ |
1034 | dasd_eer_snss(device); | |
1035 | ||
eb6e199b | 1036 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
8e09f215 SW |
1037 | dasd_schedule_device_bh(device); |
1038 | if (device->block) | |
1039 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
1040 | } |
1041 | ||
1042 | /* | |
1043 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1044 | */ | |
8e09f215 SW |
1045 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1046 | struct irb *irb) | |
1da177e4 LT |
1047 | { |
1048 | struct dasd_ccw_req *cqr, *next; | |
1049 | struct dasd_device *device; | |
1050 | unsigned long long now; | |
1051 | int expires; | |
1da177e4 LT |
1052 | |
1053 | if (IS_ERR(irb)) { | |
1054 | switch (PTR_ERR(irb)) { | |
1055 | case -EIO: | |
1da177e4 LT |
1056 | break; |
1057 | case -ETIMEDOUT: | |
b8ed5dd5 SH |
1058 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1059 | "request timed out\n", __func__); | |
1da177e4 LT |
1060 | break; |
1061 | default: | |
b8ed5dd5 SH |
1062 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1063 | "unknown error %ld\n", __func__, | |
1064 | PTR_ERR(irb)); | |
1da177e4 | 1065 | } |
f16f5843 | 1066 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1067 | return; |
1068 | } | |
1069 | ||
1070 | now = get_clock(); | |
1071 | ||
8e09f215 SW |
1072 | /* check for unsolicited interrupts */ |
1073 | cqr = (struct dasd_ccw_req *) intparm; | |
f3eb5384 SW |
1074 | if (!cqr || ((scsw_cc(&irb->scsw) == 1) && |
1075 | (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) && | |
1076 | (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))) { | |
8e09f215 SW |
1077 | if (cqr && cqr->status == DASD_CQR_IN_IO) |
1078 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1079 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1080 | if (!IS_ERR(device)) { |
8e09f215 SW |
1081 | dasd_device_clear_timer(device); |
1082 | device->discipline->handle_unsolicited_interrupt(device, | |
1083 | irb); | |
1da177e4 LT |
1084 | dasd_put_device(device); |
1085 | } | |
1086 | return; | |
1087 | } | |
1088 | ||
8e09f215 SW |
1089 | device = (struct dasd_device *) cqr->startdev; |
1090 | if (!device || | |
1da177e4 | 1091 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
294001a8 SH |
1092 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1093 | "invalid device in request"); | |
1da177e4 LT |
1094 | return; |
1095 | } | |
1096 | ||
1097 | /* Check for clear pending */ | |
8e09f215 | 1098 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1099 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1100 | cqr->status = DASD_CQR_CLEARED; |
1101 | dasd_device_clear_timer(device); | |
8f61701b | 1102 | wake_up(&dasd_flush_wq); |
8e09f215 | 1103 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1104 | return; |
1105 | } | |
1106 | ||
f3eb5384 | 1107 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1108 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1109 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1110 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1111 | return; |
1112 | } | |
fc19f381 | 1113 | |
8e09f215 | 1114 | next = NULL; |
1da177e4 | 1115 | expires = 0; |
f3eb5384 SW |
1116 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1117 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1118 | /* request was completed successfully */ |
1119 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1120 | cqr->stopclk = now; |
1121 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1122 | if (cqr->devlist.next != &device->ccw_queue) { |
1123 | next = list_entry(cqr->devlist.next, | |
1124 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1125 | } |
8e09f215 SW |
1126 | } else { /* error */ |
1127 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
fc19f381 SH |
1128 | /* log sense for every failed I/O to s390 debugfeature */ |
1129 | dasd_log_sense_dbf(cqr, irb); | |
9575bf26 | 1130 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1131 | dasd_log_sense(cqr, irb); |
1132 | } | |
fc19f381 | 1133 | |
6c5f57c7 SH |
1134 | /* |
1135 | * If we don't want complex ERP for this request, then just | |
1136 | * reset this and retry it in the fastpath | |
8e09f215 | 1137 | */ |
6c5f57c7 | 1138 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1139 | cqr->retries > 0) { |
fc19f381 SH |
1140 | if (cqr->lpm == LPM_ANYPATH) |
1141 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
1142 | "default ERP in fastpath " | |
1143 | "(%i retries left)", | |
1144 | cqr->retries); | |
8e09f215 SW |
1145 | cqr->lpm = LPM_ANYPATH; |
1146 | cqr->status = DASD_CQR_QUEUED; | |
1147 | next = cqr; | |
1148 | } else | |
1da177e4 | 1149 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1150 | } |
1151 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1152 | (!device->stopped)) { | |
1153 | if (device->discipline->start_IO(next) == 0) | |
1154 | expires = next->expires; | |
1da177e4 LT |
1155 | } |
1156 | if (expires != 0) | |
8e09f215 | 1157 | dasd_device_set_timer(device, expires); |
1da177e4 | 1158 | else |
8e09f215 SW |
1159 | dasd_device_clear_timer(device); |
1160 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1161 | } |
1162 | ||
1163 | /* | |
8e09f215 SW |
1164 | * If we have an error on a dasd_block layer request then we cancel |
1165 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1166 | */ |
8e09f215 SW |
1167 | static void __dasd_device_recovery(struct dasd_device *device, |
1168 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1169 | { |
8e09f215 SW |
1170 | struct list_head *l, *n; |
1171 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1172 | |
8e09f215 SW |
1173 | /* |
1174 | * only requeue request that came from the dasd_block layer | |
1175 | */ | |
1176 | if (!ref_cqr->block) | |
1177 | return; | |
1da177e4 | 1178 | |
8e09f215 SW |
1179 | list_for_each_safe(l, n, &device->ccw_queue) { |
1180 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1181 | if (cqr->status == DASD_CQR_QUEUED && | |
1182 | ref_cqr->block == cqr->block) { | |
1183 | cqr->status = DASD_CQR_CLEARED; | |
1184 | } | |
1185 | } | |
1186 | }; | |
1da177e4 LT |
1187 | |
1188 | /* | |
8e09f215 SW |
1189 | * Remove those ccw requests from the queue that need to be returned |
1190 | * to the upper layer. | |
1da177e4 | 1191 | */ |
8e09f215 SW |
1192 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1193 | struct list_head *final_queue) | |
1da177e4 LT |
1194 | { |
1195 | struct list_head *l, *n; | |
1196 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1197 | |
1da177e4 LT |
1198 | /* Process request with final status. */ |
1199 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1200 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1201 | ||
1da177e4 | 1202 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1203 | if (cqr->status == DASD_CQR_QUEUED || |
1204 | cqr->status == DASD_CQR_IN_IO || | |
1205 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1206 | break; |
1da177e4 | 1207 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1208 | __dasd_device_recovery(device, cqr); |
20c64468 | 1209 | } |
1da177e4 | 1210 | /* Rechain finished requests to final queue */ |
8e09f215 | 1211 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1212 | } |
1213 | } | |
1214 | ||
1da177e4 | 1215 | /* |
8e09f215 SW |
1216 | * the cqrs from the final queue are returned to the upper layer |
1217 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1218 | */ |
8e09f215 SW |
1219 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1220 | struct list_head *final_queue) | |
1da177e4 | 1221 | { |
8e09f215 | 1222 | struct list_head *l, *n; |
1da177e4 | 1223 | struct dasd_ccw_req *cqr; |
03513bcc | 1224 | struct dasd_block *block; |
c80ee724 SH |
1225 | void (*callback)(struct dasd_ccw_req *, void *data); |
1226 | void *callback_data; | |
fc19f381 | 1227 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1228 | |
8e09f215 SW |
1229 | list_for_each_safe(l, n, final_queue) { |
1230 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1231 | list_del_init(&cqr->devlist); | |
03513bcc | 1232 | block = cqr->block; |
c80ee724 SH |
1233 | callback = cqr->callback; |
1234 | callback_data = cqr->callback_data; | |
03513bcc SW |
1235 | if (block) |
1236 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1237 | switch (cqr->status) { |
1238 | case DASD_CQR_SUCCESS: | |
1239 | cqr->status = DASD_CQR_DONE; | |
1240 | break; | |
1241 | case DASD_CQR_ERROR: | |
1242 | cqr->status = DASD_CQR_NEED_ERP; | |
1243 | break; | |
1244 | case DASD_CQR_CLEARED: | |
1245 | cqr->status = DASD_CQR_TERMINATED; | |
1246 | break; | |
1247 | default: | |
fc19f381 SH |
1248 | /* internal error 12 - wrong cqr status*/ |
1249 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1250 | dev_err(&device->cdev->dev, | |
1251 | "An error occurred in the DASD device driver, " | |
1252 | "reason=%s\n", errorstring); | |
8e09f215 | 1253 | BUG(); |
1da177e4 | 1254 | } |
8e09f215 | 1255 | if (cqr->callback != NULL) |
c80ee724 | 1256 | (callback)(cqr, callback_data); |
03513bcc SW |
1257 | if (block) |
1258 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1259 | } |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * Take a look at the first request on the ccw queue and check | |
1264 | * if it reached its expire time. If so, terminate the IO. | |
1265 | */ | |
8e09f215 | 1266 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1267 | { |
1268 | struct dasd_ccw_req *cqr; | |
1269 | ||
1270 | if (list_empty(&device->ccw_queue)) | |
1271 | return; | |
8e09f215 | 1272 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1273 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1274 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1275 | if (device->discipline->term_IO(cqr) != 0) { | |
1276 | /* Hmpf, try again in 5 sec */ | |
fc19f381 SH |
1277 | dev_err(&device->cdev->dev, |
1278 | "cqr %p timed out (%is) but cannot be " | |
1279 | "ended, retrying in 5 s\n", | |
1280 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1281 | cqr->expires += 5*HZ; |
1282 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1283 | } else { |
fc19f381 SH |
1284 | dev_err(&device->cdev->dev, |
1285 | "cqr %p timed out (%is), %i retries " | |
1286 | "remaining\n", cqr, (cqr->expires/HZ), | |
1287 | cqr->retries); | |
1da177e4 LT |
1288 | } |
1289 | } | |
1290 | } | |
1291 | ||
1292 | /* | |
1293 | * Take a look at the first request on the ccw queue and check | |
1294 | * if it needs to be started. | |
1295 | */ | |
8e09f215 | 1296 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1297 | { |
1298 | struct dasd_ccw_req *cqr; | |
1299 | int rc; | |
1300 | ||
1301 | if (list_empty(&device->ccw_queue)) | |
1302 | return; | |
8e09f215 | 1303 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1304 | if (cqr->status != DASD_CQR_QUEUED) |
1305 | return; | |
8e09f215 SW |
1306 | /* when device is stopped, return request to previous layer */ |
1307 | if (device->stopped) { | |
1308 | cqr->status = DASD_CQR_CLEARED; | |
1309 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1310 | return; |
1c01b8a5 | 1311 | } |
25ee4cf8 PO |
1312 | |
1313 | rc = device->discipline->start_IO(cqr); | |
1314 | if (rc == 0) | |
8e09f215 | 1315 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1316 | else if (rc == -EACCES) { |
8e09f215 | 1317 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1318 | } else |
1319 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1320 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1321 | } |
1322 | ||
1da177e4 | 1323 | /* |
8e09f215 SW |
1324 | * Go through all request on the dasd_device request queue, |
1325 | * terminate them on the cdev if necessary, and return them to the | |
1326 | * submitting layer via callback. | |
1327 | * Note: | |
1328 | * Make sure that all 'submitting layers' still exist when | |
1329 | * this function is called!. In other words, when 'device' is a base | |
1330 | * device then all block layer requests must have been removed before | |
1331 | * via dasd_flush_block_queue. | |
1da177e4 | 1332 | */ |
8e09f215 | 1333 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1334 | { |
8e09f215 SW |
1335 | struct dasd_ccw_req *cqr, *n; |
1336 | int rc; | |
1da177e4 | 1337 | struct list_head flush_queue; |
1da177e4 LT |
1338 | |
1339 | INIT_LIST_HEAD(&flush_queue); | |
1340 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1341 | rc = 0; |
8e09f215 | 1342 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1343 | /* Check status and move request to flush_queue */ |
1344 | switch (cqr->status) { | |
1345 | case DASD_CQR_IN_IO: | |
1346 | rc = device->discipline->term_IO(cqr); | |
1347 | if (rc) { | |
1348 | /* unable to terminate requeust */ | |
fc19f381 SH |
1349 | dev_err(&device->cdev->dev, |
1350 | "Flushing the DASD request queue " | |
1351 | "failed for request %p\n", cqr); | |
8f61701b HH |
1352 | /* stop flush processing */ |
1353 | goto finished; | |
1354 | } | |
1355 | break; | |
1356 | case DASD_CQR_QUEUED: | |
1da177e4 | 1357 | cqr->stopclk = get_clock(); |
8e09f215 | 1358 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1359 | break; |
8e09f215 | 1360 | default: /* no need to modify the others */ |
8f61701b HH |
1361 | break; |
1362 | } | |
8e09f215 | 1363 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1364 | } |
8f61701b HH |
1365 | finished: |
1366 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1367 | /* |
1368 | * After this point all requests must be in state CLEAR_PENDING, | |
1369 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1370 | * one of the others. | |
1371 | */ | |
1372 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1373 | wait_event(dasd_flush_wq, | |
1374 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1375 | /* | |
1376 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1377 | * and call the callback function of flushed requests | |
1378 | */ | |
1379 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1380 | return rc; |
1da177e4 LT |
1381 | } |
1382 | ||
1383 | /* | |
1384 | * Acquire the device lock and process queues for the device. | |
1385 | */ | |
8e09f215 | 1386 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1387 | { |
1388 | struct list_head final_queue; | |
1da177e4 LT |
1389 | |
1390 | atomic_set (&device->tasklet_scheduled, 0); | |
1391 | INIT_LIST_HEAD(&final_queue); | |
1392 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1393 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1394 | __dasd_device_check_expire(device); |
1395 | /* find final requests on ccw queue */ | |
1396 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1397 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1398 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1399 | __dasd_device_process_final_queue(device, &final_queue); |
1400 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1401 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1402 | __dasd_device_start_head(device); |
1403 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1404 | dasd_put_device(device); |
1405 | } | |
1406 | ||
1407 | /* | |
1408 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1409 | */ | |
8e09f215 | 1410 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1411 | { |
1412 | /* Protect against rescheduling. */ | |
973bd993 | 1413 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1414 | return; |
1415 | dasd_get_device(device); | |
1416 | tasklet_hi_schedule(&device->tasklet); | |
1417 | } | |
1418 | ||
eb6e199b SW |
1419 | void dasd_device_set_stop_bits(struct dasd_device *device, int bits) |
1420 | { | |
1421 | device->stopped |= bits; | |
1422 | } | |
1423 | EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); | |
1424 | ||
1425 | void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) | |
1426 | { | |
1427 | device->stopped &= ~bits; | |
1428 | if (!device->stopped) | |
1429 | wake_up(&generic_waitq); | |
1430 | } | |
1431 | EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); | |
1432 | ||
1da177e4 | 1433 | /* |
8e09f215 SW |
1434 | * Queue a request to the head of the device ccw_queue. |
1435 | * Start the I/O if possible. | |
1da177e4 | 1436 | */ |
8e09f215 | 1437 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1438 | { |
1439 | struct dasd_device *device; | |
1440 | unsigned long flags; | |
1441 | ||
8e09f215 | 1442 | device = cqr->startdev; |
1da177e4 | 1443 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1444 | cqr->status = DASD_CQR_QUEUED; |
1445 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1446 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1447 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1448 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1449 | } | |
1450 | ||
1451 | /* | |
8e09f215 SW |
1452 | * Queue a request to the tail of the device ccw_queue. |
1453 | * Start the I/O if possible. | |
1da177e4 | 1454 | */ |
8e09f215 | 1455 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1456 | { |
1457 | struct dasd_device *device; | |
1458 | unsigned long flags; | |
1459 | ||
8e09f215 | 1460 | device = cqr->startdev; |
1da177e4 | 1461 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1462 | cqr->status = DASD_CQR_QUEUED; |
1463 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1464 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1465 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1466 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1467 | } | |
1468 | ||
1469 | /* | |
8e09f215 | 1470 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1471 | */ |
8e09f215 | 1472 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 LT |
1473 | { |
1474 | wake_up((wait_queue_head_t *) data); | |
1475 | } | |
1476 | ||
8e09f215 | 1477 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1478 | { |
1479 | struct dasd_device *device; | |
1480 | int rc; | |
1481 | ||
8e09f215 | 1482 | device = cqr->startdev; |
1da177e4 | 1483 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
c2ba444d | 1484 | rc = ((cqr->status == DASD_CQR_DONE || |
8e09f215 SW |
1485 | cqr->status == DASD_CQR_NEED_ERP || |
1486 | cqr->status == DASD_CQR_TERMINATED) && | |
1487 | list_empty(&cqr->devlist)); | |
1da177e4 LT |
1488 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1489 | return rc; | |
1490 | } | |
1491 | ||
1492 | /* | |
eb6e199b | 1493 | * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. |
1da177e4 | 1494 | */ |
eb6e199b | 1495 | static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) |
1da177e4 | 1496 | { |
1da177e4 | 1497 | struct dasd_device *device; |
eb6e199b | 1498 | dasd_erp_fn_t erp_fn; |
138c014d | 1499 | |
eb6e199b SW |
1500 | if (cqr->status == DASD_CQR_FILLED) |
1501 | return 0; | |
8e09f215 | 1502 | device = cqr->startdev; |
eb6e199b SW |
1503 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
1504 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1505 | device->discipline->handle_terminated_request(cqr); | |
1506 | return 1; | |
1507 | } | |
1508 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
1509 | erp_fn = device->discipline->erp_action(cqr); | |
1510 | erp_fn(cqr); | |
1511 | return 1; | |
1512 | } | |
1513 | if (cqr->status == DASD_CQR_FAILED) | |
1514 | dasd_log_sense(cqr, &cqr->irb); | |
1515 | if (cqr->refers) { | |
1516 | __dasd_process_erp(device, cqr); | |
1517 | return 1; | |
1518 | } | |
1519 | } | |
1520 | return 0; | |
1521 | } | |
138c014d | 1522 | |
eb6e199b SW |
1523 | static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) |
1524 | { | |
1525 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { | |
1526 | if (cqr->refers) /* erp is not done yet */ | |
1527 | return 1; | |
1528 | return ((cqr->status != DASD_CQR_DONE) && | |
1529 | (cqr->status != DASD_CQR_FAILED)); | |
1530 | } else | |
1531 | return (cqr->status == DASD_CQR_FILLED); | |
1532 | } | |
138c014d | 1533 | |
eb6e199b SW |
1534 | static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) |
1535 | { | |
1536 | struct dasd_device *device; | |
1537 | int rc; | |
1538 | struct list_head ccw_queue; | |
1539 | struct dasd_ccw_req *cqr; | |
1540 | ||
1541 | INIT_LIST_HEAD(&ccw_queue); | |
1542 | maincqr->status = DASD_CQR_FILLED; | |
1543 | device = maincqr->startdev; | |
1544 | list_add(&maincqr->blocklist, &ccw_queue); | |
1545 | for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); | |
1546 | cqr = list_first_entry(&ccw_queue, | |
1547 | struct dasd_ccw_req, blocklist)) { | |
1548 | ||
1549 | if (__dasd_sleep_on_erp(cqr)) | |
1550 | continue; | |
1551 | if (cqr->status != DASD_CQR_FILLED) /* could be failed */ | |
1552 | continue; | |
1553 | ||
1554 | /* Non-temporary stop condition will trigger fail fast */ | |
1555 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
1556 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1557 | (!dasd_eer_enabled(device))) { | |
1558 | cqr->status = DASD_CQR_FAILED; | |
1559 | continue; | |
1560 | } | |
1561 | ||
1562 | /* Don't try to start requests if device is stopped */ | |
1563 | if (interruptible) { | |
1564 | rc = wait_event_interruptible( | |
1565 | generic_waitq, !(device->stopped)); | |
1566 | if (rc == -ERESTARTSYS) { | |
1567 | cqr->status = DASD_CQR_FAILED; | |
1568 | maincqr->intrc = rc; | |
1569 | continue; | |
1570 | } | |
1571 | } else | |
1572 | wait_event(generic_waitq, !(device->stopped)); | |
1573 | ||
1574 | cqr->callback = dasd_wakeup_cb; | |
1575 | cqr->callback_data = (void *) &generic_waitq; | |
1576 | dasd_add_request_tail(cqr); | |
1577 | if (interruptible) { | |
1578 | rc = wait_event_interruptible( | |
1579 | generic_waitq, _wait_for_wakeup(cqr)); | |
1580 | if (rc == -ERESTARTSYS) { | |
1581 | dasd_cancel_req(cqr); | |
1582 | /* wait (non-interruptible) for final status */ | |
1583 | wait_event(generic_waitq, | |
1584 | _wait_for_wakeup(cqr)); | |
1585 | cqr->status = DASD_CQR_FAILED; | |
1586 | maincqr->intrc = rc; | |
1587 | continue; | |
1588 | } | |
1589 | } else | |
1590 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); | |
1591 | } | |
1592 | ||
1593 | maincqr->endclk = get_clock(); | |
1594 | if ((maincqr->status != DASD_CQR_DONE) && | |
1595 | (maincqr->intrc != -ERESTARTSYS)) | |
1596 | dasd_log_sense(maincqr, &maincqr->irb); | |
1597 | if (maincqr->status == DASD_CQR_DONE) | |
6cc7f168 | 1598 | rc = 0; |
eb6e199b SW |
1599 | else if (maincqr->intrc) |
1600 | rc = maincqr->intrc; | |
6cc7f168 SW |
1601 | else |
1602 | rc = -EIO; | |
1da177e4 LT |
1603 | return rc; |
1604 | } | |
1605 | ||
eb6e199b SW |
1606 | /* |
1607 | * Queue a request to the tail of the device ccw_queue and wait for | |
1608 | * it's completion. | |
1609 | */ | |
1610 | int dasd_sleep_on(struct dasd_ccw_req *cqr) | |
1611 | { | |
1612 | return _dasd_sleep_on(cqr, 0); | |
1613 | } | |
1614 | ||
1da177e4 | 1615 | /* |
8e09f215 SW |
1616 | * Queue a request to the tail of the device ccw_queue and wait |
1617 | * interruptible for it's completion. | |
1da177e4 | 1618 | */ |
8e09f215 | 1619 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 1620 | { |
eb6e199b | 1621 | return _dasd_sleep_on(cqr, 1); |
1da177e4 LT |
1622 | } |
1623 | ||
1624 | /* | |
1625 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1626 | * for eckd devices) the currently running request has to be terminated | |
1627 | * and be put back to status queued, before the special request is added | |
1628 | * to the head of the queue. Then the special request is waited on normally. | |
1629 | */ | |
8e09f215 | 1630 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1631 | { |
1632 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1633 | |
1634 | if (list_empty(&device->ccw_queue)) | |
1635 | return 0; | |
8e09f215 | 1636 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1637 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1638 | } |
1639 | ||
8e09f215 | 1640 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 1641 | { |
1da177e4 LT |
1642 | struct dasd_device *device; |
1643 | int rc; | |
138c014d | 1644 | |
8e09f215 | 1645 | device = cqr->startdev; |
1da177e4 LT |
1646 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1647 | rc = _dasd_term_running_cqr(device); | |
1648 | if (rc) { | |
1649 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1650 | return rc; | |
1651 | } | |
138c014d | 1652 | |
1da177e4 | 1653 | cqr->callback = dasd_wakeup_cb; |
c80ee724 | 1654 | cqr->callback_data = (void *) &generic_waitq; |
1da177e4 | 1655 | cqr->status = DASD_CQR_QUEUED; |
8e09f215 | 1656 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1657 | |
1da177e4 | 1658 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1659 | dasd_schedule_device_bh(device); |
138c014d | 1660 | |
1da177e4 LT |
1661 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1662 | ||
c80ee724 | 1663 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 1664 | |
6cc7f168 SW |
1665 | if (cqr->status == DASD_CQR_DONE) |
1666 | rc = 0; | |
1667 | else if (cqr->intrc) | |
1668 | rc = cqr->intrc; | |
1669 | else | |
1670 | rc = -EIO; | |
1da177e4 LT |
1671 | return rc; |
1672 | } | |
1673 | ||
1674 | /* | |
1675 | * Cancels a request that was started with dasd_sleep_on_req. | |
1676 | * This is useful to timeout requests. The request will be | |
1677 | * terminated if it is currently in i/o. | |
1678 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1679 | * 0 if there was no need to terminate the request (not started yet) |
1680 | * negative error code if termination failed | |
1681 | * Cancellation of a request is an asynchronous operation! The calling | |
1682 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1683 | */ |
8e09f215 | 1684 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1685 | { |
8e09f215 | 1686 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1687 | unsigned long flags; |
1688 | int rc; | |
1689 | ||
1690 | rc = 0; | |
1691 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1692 | switch (cqr->status) { | |
1693 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1694 | /* request was not started - just set to cleared */ |
1695 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1696 | break; |
1697 | case DASD_CQR_IN_IO: | |
1698 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1699 | rc = device->discipline->term_IO(cqr); |
1700 | if (rc) { | |
fc19f381 SH |
1701 | dev_err(&device->cdev->dev, |
1702 | "Cancelling request %p failed with rc=%d\n", | |
1703 | cqr, rc); | |
8e09f215 SW |
1704 | } else { |
1705 | cqr->stopclk = get_clock(); | |
8e09f215 | 1706 | } |
1da177e4 | 1707 | break; |
8e09f215 | 1708 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1709 | break; |
8e09f215 SW |
1710 | } |
1711 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1712 | dasd_schedule_device_bh(device); | |
1713 | return rc; | |
1714 | } | |
1715 | ||
1716 | ||
1717 | /* | |
1718 | * SECTION: Operations of the dasd_block layer. | |
1719 | */ | |
1720 | ||
1721 | /* | |
1722 | * Timeout function for dasd_block. This is used when the block layer | |
1723 | * is waiting for something that may not come reliably, (e.g. a state | |
1724 | * change interrupt) | |
1725 | */ | |
1726 | static void dasd_block_timeout(unsigned long ptr) | |
1727 | { | |
1728 | unsigned long flags; | |
1729 | struct dasd_block *block; | |
1730 | ||
1731 | block = (struct dasd_block *) ptr; | |
1732 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1733 | /* re-activate request queue */ | |
eb6e199b | 1734 | dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); |
8e09f215 SW |
1735 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
1736 | dasd_schedule_block_bh(block); | |
1737 | } | |
1738 | ||
1739 | /* | |
1740 | * Setup timeout for a dasd_block in jiffies. | |
1741 | */ | |
1742 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1743 | { | |
48cae885 SW |
1744 | if (expires == 0) |
1745 | del_timer(&block->timer); | |
1746 | else | |
1747 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 SW |
1748 | } |
1749 | ||
1750 | /* | |
1751 | * Clear timeout for a dasd_block. | |
1752 | */ | |
1753 | void dasd_block_clear_timer(struct dasd_block *block) | |
1754 | { | |
48cae885 | 1755 | del_timer(&block->timer); |
8e09f215 SW |
1756 | } |
1757 | ||
8e09f215 SW |
1758 | /* |
1759 | * Process finished error recovery ccw. | |
1760 | */ | |
eb6e199b SW |
1761 | static void __dasd_process_erp(struct dasd_device *device, |
1762 | struct dasd_ccw_req *cqr) | |
8e09f215 SW |
1763 | { |
1764 | dasd_erp_fn_t erp_fn; | |
8e09f215 SW |
1765 | |
1766 | if (cqr->status == DASD_CQR_DONE) | |
1767 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1768 | else | |
fc19f381 | 1769 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
1770 | erp_fn = device->discipline->erp_postaction(cqr); |
1771 | erp_fn(cqr); | |
1772 | } | |
1da177e4 | 1773 | |
8e09f215 SW |
1774 | /* |
1775 | * Fetch requests from the block device queue. | |
1776 | */ | |
1777 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1778 | { | |
1779 | struct request_queue *queue; | |
1780 | struct request *req; | |
1781 | struct dasd_ccw_req *cqr; | |
1782 | struct dasd_device *basedev; | |
1783 | unsigned long flags; | |
1784 | queue = block->request_queue; | |
1785 | basedev = block->base; | |
1786 | /* No queue ? Then there is nothing to do. */ | |
1787 | if (queue == NULL) | |
1788 | return; | |
1789 | ||
1790 | /* | |
1791 | * We requeue request from the block device queue to the ccw | |
1792 | * queue only in two states. In state DASD_STATE_READY the | |
1793 | * partition detection is done and we need to requeue requests | |
1794 | * for that. State DASD_STATE_ONLINE is normal block device | |
1795 | * operation. | |
1796 | */ | |
97f604b0 SW |
1797 | if (basedev->state < DASD_STATE_READY) { |
1798 | while ((req = blk_fetch_request(block->request_queue))) | |
1799 | __blk_end_request_all(req, -EIO); | |
8e09f215 | 1800 | return; |
97f604b0 | 1801 | } |
8e09f215 | 1802 | /* Now we try to fetch requests from the request queue */ |
9934c8c0 | 1803 | while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) { |
8e09f215 SW |
1804 | if (basedev->features & DASD_FEATURE_READONLY && |
1805 | rq_data_dir(req) == WRITE) { | |
1806 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1807 | "Rejecting write request %p", | |
1808 | req); | |
9934c8c0 | 1809 | blk_start_request(req); |
40cbbb78 | 1810 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1811 | continue; |
1812 | } | |
1813 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1814 | if (IS_ERR(cqr)) { | |
1815 | if (PTR_ERR(cqr) == -EBUSY) | |
1816 | break; /* normal end condition */ | |
1817 | if (PTR_ERR(cqr) == -ENOMEM) | |
1818 | break; /* terminate request queue loop */ | |
1819 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1820 | /* | |
1821 | * The current request cannot be build right | |
1822 | * now, we have to try later. If this request | |
1823 | * is the head-of-queue we stop the device | |
1824 | * for 1/2 second. | |
1825 | */ | |
1826 | if (!list_empty(&block->ccw_queue)) | |
1827 | break; | |
eb6e199b SW |
1828 | spin_lock_irqsave( |
1829 | get_ccwdev_lock(basedev->cdev), flags); | |
1830 | dasd_device_set_stop_bits(basedev, | |
1831 | DASD_STOPPED_PENDING); | |
1832 | spin_unlock_irqrestore( | |
1833 | get_ccwdev_lock(basedev->cdev), flags); | |
8e09f215 SW |
1834 | dasd_block_set_timer(block, HZ/2); |
1835 | break; | |
1836 | } | |
1837 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1838 | "CCW creation failed (rc=%ld) " | |
1839 | "on request %p", | |
1840 | PTR_ERR(cqr), req); | |
9934c8c0 | 1841 | blk_start_request(req); |
40cbbb78 | 1842 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
1843 | continue; |
1844 | } | |
1845 | /* | |
1846 | * Note: callback is set to dasd_return_cqr_cb in | |
1847 | * __dasd_block_start_head to cover erp requests as well | |
1848 | */ | |
1849 | cqr->callback_data = (void *) req; | |
1850 | cqr->status = DASD_CQR_FILLED; | |
9934c8c0 | 1851 | blk_start_request(req); |
8e09f215 SW |
1852 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
1853 | dasd_profile_start(block, cqr, req); | |
1854 | } | |
1855 | } | |
1856 | ||
1857 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1858 | { | |
1859 | struct request *req; | |
1860 | int status; | |
4c4e2148 | 1861 | int error = 0; |
8e09f215 SW |
1862 | |
1863 | req = (struct request *) cqr->callback_data; | |
1864 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 1865 | status = cqr->block->base->discipline->free_cp(cqr, req); |
4c4e2148 KU |
1866 | if (status <= 0) |
1867 | error = status ? status : -EIO; | |
40cbbb78 | 1868 | __blk_end_request_all(req, error); |
8e09f215 SW |
1869 | } |
1870 | ||
1871 | /* | |
1872 | * Process ccw request queue. | |
1873 | */ | |
1874 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1875 | struct list_head *final_queue) | |
1876 | { | |
1877 | struct list_head *l, *n; | |
1878 | struct dasd_ccw_req *cqr; | |
1879 | dasd_erp_fn_t erp_fn; | |
1880 | unsigned long flags; | |
1881 | struct dasd_device *base = block->base; | |
1882 | ||
1883 | restart: | |
1884 | /* Process request with final status. */ | |
1885 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1886 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1887 | if (cqr->status != DASD_CQR_DONE && | |
1888 | cqr->status != DASD_CQR_FAILED && | |
1889 | cqr->status != DASD_CQR_NEED_ERP && | |
1890 | cqr->status != DASD_CQR_TERMINATED) | |
1891 | continue; | |
1892 | ||
1893 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1894 | base->discipline->handle_terminated_request(cqr); | |
1895 | goto restart; | |
1896 | } | |
1897 | ||
1898 | /* Process requests that may be recovered */ | |
1899 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 SH |
1900 | erp_fn = base->discipline->erp_action(cqr); |
1901 | erp_fn(cqr); | |
8e09f215 SW |
1902 | goto restart; |
1903 | } | |
1904 | ||
a9cffb22 SH |
1905 | /* log sense for fatal error */ |
1906 | if (cqr->status == DASD_CQR_FAILED) { | |
1907 | dasd_log_sense(cqr, &cqr->irb); | |
1908 | } | |
1909 | ||
8e09f215 SW |
1910 | /* First of all call extended error reporting. */ |
1911 | if (dasd_eer_enabled(base) && | |
1912 | cqr->status == DASD_CQR_FAILED) { | |
1913 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1914 | ||
1915 | /* restart request */ | |
1916 | cqr->status = DASD_CQR_FILLED; | |
1917 | cqr->retries = 255; | |
1918 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
eb6e199b | 1919 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 SW |
1920 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
1921 | flags); | |
1922 | goto restart; | |
1923 | } | |
1924 | ||
1925 | /* Process finished ERP request. */ | |
1926 | if (cqr->refers) { | |
eb6e199b | 1927 | __dasd_process_erp(base, cqr); |
8e09f215 SW |
1928 | goto restart; |
1929 | } | |
1930 | ||
1931 | /* Rechain finished requests to final queue */ | |
1932 | cqr->endclk = get_clock(); | |
1933 | list_move_tail(&cqr->blocklist, final_queue); | |
1934 | } | |
1935 | } | |
1936 | ||
1937 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1938 | { | |
1939 | dasd_schedule_block_bh(cqr->block); | |
1940 | } | |
1941 | ||
1942 | static void __dasd_block_start_head(struct dasd_block *block) | |
1943 | { | |
1944 | struct dasd_ccw_req *cqr; | |
1945 | ||
1946 | if (list_empty(&block->ccw_queue)) | |
1947 | return; | |
1948 | /* We allways begin with the first requests on the queue, as some | |
1949 | * of previously started requests have to be enqueued on a | |
1950 | * dasd_device again for error recovery. | |
1951 | */ | |
1952 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1953 | if (cqr->status != DASD_CQR_FILLED) | |
1954 | continue; | |
1955 | /* Non-temporary stop condition will trigger fail fast */ | |
1956 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1957 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1958 | (!dasd_eer_enabled(block->base))) { | |
1959 | cqr->status = DASD_CQR_FAILED; | |
1960 | dasd_schedule_block_bh(block); | |
1961 | continue; | |
1962 | } | |
1963 | /* Don't try to start requests if device is stopped */ | |
1964 | if (block->base->stopped) | |
1965 | return; | |
1966 | ||
1967 | /* just a fail safe check, should not happen */ | |
1968 | if (!cqr->startdev) | |
1969 | cqr->startdev = block->base; | |
1970 | ||
1971 | /* make sure that the requests we submit find their way back */ | |
1972 | cqr->callback = dasd_return_cqr_cb; | |
1973 | ||
1974 | dasd_add_request_tail(cqr); | |
1975 | } | |
1976 | } | |
1977 | ||
1978 | /* | |
1979 | * Central dasd_block layer routine. Takes requests from the generic | |
1980 | * block layer request queue, creates ccw requests, enqueues them on | |
1981 | * a dasd_device and processes ccw requests that have been returned. | |
1982 | */ | |
1983 | static void dasd_block_tasklet(struct dasd_block *block) | |
1984 | { | |
1985 | struct list_head final_queue; | |
1986 | struct list_head *l, *n; | |
1987 | struct dasd_ccw_req *cqr; | |
1988 | ||
1989 | atomic_set(&block->tasklet_scheduled, 0); | |
1990 | INIT_LIST_HEAD(&final_queue); | |
1991 | spin_lock(&block->queue_lock); | |
1992 | /* Finish off requests on ccw queue */ | |
1993 | __dasd_process_block_ccw_queue(block, &final_queue); | |
1994 | spin_unlock(&block->queue_lock); | |
1995 | /* Now call the callback function of requests with final status */ | |
1996 | spin_lock_irq(&block->request_queue_lock); | |
1997 | list_for_each_safe(l, n, &final_queue) { | |
1998 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1999 | list_del_init(&cqr->blocklist); | |
2000 | __dasd_cleanup_cqr(cqr); | |
2001 | } | |
2002 | spin_lock(&block->queue_lock); | |
2003 | /* Get new request from the block device request queue */ | |
2004 | __dasd_process_request_queue(block); | |
2005 | /* Now check if the head of the ccw queue needs to be started. */ | |
2006 | __dasd_block_start_head(block); | |
2007 | spin_unlock(&block->queue_lock); | |
2008 | spin_unlock_irq(&block->request_queue_lock); | |
2009 | dasd_put_device(block->base); | |
2010 | } | |
2011 | ||
2012 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
2013 | { | |
2014 | wake_up(&dasd_flush_wq); | |
2015 | } | |
2016 | ||
2017 | /* | |
2018 | * Go through all request on the dasd_block request queue, cancel them | |
2019 | * on the respective dasd_device, and return them to the generic | |
2020 | * block layer. | |
2021 | */ | |
2022 | static int dasd_flush_block_queue(struct dasd_block *block) | |
2023 | { | |
2024 | struct dasd_ccw_req *cqr, *n; | |
2025 | int rc, i; | |
2026 | struct list_head flush_queue; | |
2027 | ||
2028 | INIT_LIST_HEAD(&flush_queue); | |
2029 | spin_lock_bh(&block->queue_lock); | |
2030 | rc = 0; | |
2031 | restart: | |
2032 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
2033 | /* if this request currently owned by a dasd_device cancel it */ | |
2034 | if (cqr->status >= DASD_CQR_QUEUED) | |
2035 | rc = dasd_cancel_req(cqr); | |
2036 | if (rc < 0) | |
2037 | break; | |
2038 | /* Rechain request (including erp chain) so it won't be | |
2039 | * touched by the dasd_block_tasklet anymore. | |
2040 | * Replace the callback so we notice when the request | |
2041 | * is returned from the dasd_device layer. | |
2042 | */ | |
2043 | cqr->callback = _dasd_wake_block_flush_cb; | |
2044 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
2045 | list_move_tail(&cqr->blocklist, &flush_queue); | |
2046 | if (i > 1) | |
2047 | /* moved more than one request - need to restart */ | |
2048 | goto restart; | |
2049 | } | |
2050 | spin_unlock_bh(&block->queue_lock); | |
2051 | /* Now call the callback function of flushed requests */ | |
2052 | restart_cb: | |
2053 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
2054 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
2055 | /* Process finished ERP request. */ | |
2056 | if (cqr->refers) { | |
0cd4bd47 | 2057 | spin_lock_bh(&block->queue_lock); |
eb6e199b | 2058 | __dasd_process_erp(block->base, cqr); |
0cd4bd47 | 2059 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
2060 | /* restart list_for_xx loop since dasd_process_erp |
2061 | * might remove multiple elements */ | |
2062 | goto restart_cb; | |
2063 | } | |
2064 | /* call the callback function */ | |
0cd4bd47 | 2065 | spin_lock_irq(&block->request_queue_lock); |
8e09f215 SW |
2066 | cqr->endclk = get_clock(); |
2067 | list_del_init(&cqr->blocklist); | |
2068 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 2069 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 2070 | } |
1da177e4 LT |
2071 | return rc; |
2072 | } | |
2073 | ||
2074 | /* | |
8e09f215 SW |
2075 | * Schedules a call to dasd_tasklet over the device tasklet. |
2076 | */ | |
2077 | void dasd_schedule_block_bh(struct dasd_block *block) | |
2078 | { | |
2079 | /* Protect against rescheduling. */ | |
2080 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
2081 | return; | |
2082 | /* life cycle of block is bound to it's base device */ | |
2083 | dasd_get_device(block->base); | |
2084 | tasklet_hi_schedule(&block->tasklet); | |
2085 | } | |
2086 | ||
2087 | ||
2088 | /* | |
2089 | * SECTION: external block device operations | |
2090 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
2091 | */ |
2092 | ||
2093 | /* | |
2094 | * Dasd request queue function. Called from ll_rw_blk.c | |
2095 | */ | |
8e09f215 | 2096 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 2097 | { |
8e09f215 | 2098 | struct dasd_block *block; |
1da177e4 | 2099 | |
8e09f215 SW |
2100 | block = queue->queuedata; |
2101 | spin_lock(&block->queue_lock); | |
1da177e4 | 2102 | /* Get new request from the block device request queue */ |
8e09f215 | 2103 | __dasd_process_request_queue(block); |
1da177e4 | 2104 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2105 | __dasd_block_start_head(block); |
2106 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
2107 | } |
2108 | ||
2109 | /* | |
2110 | * Allocate and initialize request queue and default I/O scheduler. | |
2111 | */ | |
8e09f215 | 2112 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
2113 | { |
2114 | int rc; | |
2115 | ||
8e09f215 SW |
2116 | block->request_queue = blk_init_queue(do_dasd_request, |
2117 | &block->request_queue_lock); | |
2118 | if (block->request_queue == NULL) | |
1da177e4 LT |
2119 | return -ENOMEM; |
2120 | ||
8e09f215 | 2121 | block->request_queue->queuedata = block; |
1da177e4 | 2122 | |
8e09f215 | 2123 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 2124 | block->request_queue->elevator = NULL; |
8e09f215 | 2125 | rc = elevator_init(block->request_queue, "deadline"); |
1da177e4 | 2126 | if (rc) { |
8e09f215 | 2127 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
2128 | return rc; |
2129 | } | |
2130 | return 0; | |
2131 | } | |
2132 | ||
2133 | /* | |
2134 | * Allocate and initialize request queue. | |
2135 | */ | |
8e09f215 | 2136 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
2137 | { |
2138 | int max; | |
2139 | ||
e1defc4f | 2140 | blk_queue_logical_block_size(block->request_queue, block->bp_block); |
8e09f215 SW |
2141 | max = block->base->discipline->max_blocks << block->s2b_shift; |
2142 | blk_queue_max_sectors(block->request_queue, max); | |
2143 | blk_queue_max_phys_segments(block->request_queue, -1L); | |
2144 | blk_queue_max_hw_segments(block->request_queue, -1L); | |
f3eb5384 SW |
2145 | /* with page sized segments we can translate each segement into |
2146 | * one idaw/tidaw | |
2147 | */ | |
2148 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
2149 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
8e09f215 | 2150 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); |
1da177e4 LT |
2151 | } |
2152 | ||
2153 | /* | |
2154 | * Deactivate and free request queue. | |
2155 | */ | |
8e09f215 | 2156 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 2157 | { |
8e09f215 SW |
2158 | if (block->request_queue) { |
2159 | blk_cleanup_queue(block->request_queue); | |
2160 | block->request_queue = NULL; | |
1da177e4 LT |
2161 | } |
2162 | } | |
2163 | ||
2164 | /* | |
2165 | * Flush request on the request queue. | |
2166 | */ | |
8e09f215 | 2167 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2168 | { |
2169 | struct request *req; | |
2170 | ||
8e09f215 | 2171 | if (!block->request_queue) |
1da177e4 | 2172 | return; |
138c014d | 2173 | |
8e09f215 | 2174 | spin_lock_irq(&block->request_queue_lock); |
9934c8c0 | 2175 | while ((req = blk_fetch_request(block->request_queue))) |
40cbbb78 | 2176 | __blk_end_request_all(req, -EIO); |
8e09f215 | 2177 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2178 | } |
2179 | ||
57a7c0bc | 2180 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2181 | { |
57a7c0bc | 2182 | struct dasd_block *block = bdev->bd_disk->private_data; |
9eb25122 | 2183 | struct dasd_device *base; |
1da177e4 LT |
2184 | int rc; |
2185 | ||
9eb25122 SH |
2186 | if (!block) |
2187 | return -ENODEV; | |
2188 | ||
2189 | base = block->base; | |
8e09f215 SW |
2190 | atomic_inc(&block->open_count); |
2191 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2192 | rc = -ENODEV; |
2193 | goto unlock; | |
2194 | } | |
2195 | ||
8e09f215 | 2196 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2197 | rc = -EINVAL; |
2198 | goto unlock; | |
2199 | } | |
2200 | ||
2201 | if (dasd_probeonly) { | |
fc19f381 SH |
2202 | dev_info(&base->cdev->dev, |
2203 | "Accessing the DASD failed because it is in " | |
2204 | "probeonly mode\n"); | |
1da177e4 LT |
2205 | rc = -EPERM; |
2206 | goto out; | |
2207 | } | |
2208 | ||
8e09f215 SW |
2209 | if (base->state <= DASD_STATE_BASIC) { |
2210 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2211 | " Cannot open unrecognized device"); |
2212 | rc = -ENODEV; | |
2213 | goto out; | |
2214 | } | |
2215 | ||
2216 | return 0; | |
2217 | ||
2218 | out: | |
8e09f215 | 2219 | module_put(base->discipline->owner); |
1da177e4 | 2220 | unlock: |
8e09f215 | 2221 | atomic_dec(&block->open_count); |
1da177e4 LT |
2222 | return rc; |
2223 | } | |
2224 | ||
57a7c0bc | 2225 | static int dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2226 | { |
8e09f215 | 2227 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2228 | |
8e09f215 SW |
2229 | atomic_dec(&block->open_count); |
2230 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2231 | return 0; |
2232 | } | |
2233 | ||
a885c8c4 CH |
2234 | /* |
2235 | * Return disk geometry. | |
2236 | */ | |
8e09f215 | 2237 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2238 | { |
8e09f215 SW |
2239 | struct dasd_block *block; |
2240 | struct dasd_device *base; | |
a885c8c4 | 2241 | |
8e09f215 | 2242 | block = bdev->bd_disk->private_data; |
8e09f215 | 2243 | if (!block) |
a885c8c4 | 2244 | return -ENODEV; |
cf05b824 | 2245 | base = block->base; |
a885c8c4 | 2246 | |
8e09f215 SW |
2247 | if (!base->discipline || |
2248 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2249 | return -EINVAL; |
2250 | ||
8e09f215 SW |
2251 | base->discipline->fill_geometry(block, geo); |
2252 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2253 | return 0; |
2254 | } | |
2255 | ||
83d5cde4 | 2256 | const struct block_device_operations |
1da177e4 LT |
2257 | dasd_device_operations = { |
2258 | .owner = THIS_MODULE, | |
57a7c0bc AV |
2259 | .open = dasd_open, |
2260 | .release = dasd_release, | |
0000d031 HC |
2261 | .ioctl = dasd_ioctl, |
2262 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 2263 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2264 | }; |
2265 | ||
8e09f215 SW |
2266 | /******************************************************************************* |
2267 | * end of block device operations | |
2268 | */ | |
1da177e4 LT |
2269 | |
2270 | static void | |
2271 | dasd_exit(void) | |
2272 | { | |
2273 | #ifdef CONFIG_PROC_FS | |
2274 | dasd_proc_exit(); | |
2275 | #endif | |
20c64468 | 2276 | dasd_eer_exit(); |
6bb0e010 HH |
2277 | if (dasd_page_cache != NULL) { |
2278 | kmem_cache_destroy(dasd_page_cache); | |
2279 | dasd_page_cache = NULL; | |
2280 | } | |
1da177e4 LT |
2281 | dasd_gendisk_exit(); |
2282 | dasd_devmap_exit(); | |
1da177e4 LT |
2283 | if (dasd_debug_area != NULL) { |
2284 | debug_unregister(dasd_debug_area); | |
2285 | dasd_debug_area = NULL; | |
2286 | } | |
2287 | } | |
2288 | ||
2289 | /* | |
2290 | * SECTION: common functions for ccw_driver use | |
2291 | */ | |
2292 | ||
f3445a1a CH |
2293 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
2294 | { | |
2295 | struct ccw_device *cdev = data; | |
2296 | int ret; | |
2297 | ||
2298 | ret = ccw_device_set_online(cdev); | |
2299 | if (ret) | |
2300 | pr_warning("%s: Setting the DASD online failed with rc=%d\n", | |
2301 | dev_name(&cdev->dev), ret); | |
f3445a1a CH |
2302 | } |
2303 | ||
1c01b8a5 HH |
2304 | /* |
2305 | * Initial attempt at a probe function. this can be simplified once | |
2306 | * the other detection code is gone. | |
2307 | */ | |
8e09f215 SW |
2308 | int dasd_generic_probe(struct ccw_device *cdev, |
2309 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2310 | { |
2311 | int ret; | |
2312 | ||
2313 | ret = dasd_add_sysfs_files(cdev); | |
2314 | if (ret) { | |
b8ed5dd5 SH |
2315 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", |
2316 | "dasd_generic_probe: could not add " | |
2317 | "sysfs entries"); | |
40545573 | 2318 | return ret; |
1da177e4 | 2319 | } |
40545573 | 2320 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2321 | |
40545573 HH |
2322 | /* |
2323 | * Automatically online either all dasd devices (dasd_autodetect) | |
2324 | * or all devices specified with dasd= parameters during | |
2325 | * initial probe. | |
2326 | */ | |
2327 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 2328 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 2329 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 2330 | return 0; |
1da177e4 LT |
2331 | } |
2332 | ||
1c01b8a5 HH |
2333 | /* |
2334 | * This will one day be called from a global not_oper handler. | |
2335 | * It is also used by driver_unregister during module unload. | |
2336 | */ | |
8e09f215 | 2337 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2338 | { |
2339 | struct dasd_device *device; | |
8e09f215 | 2340 | struct dasd_block *block; |
1da177e4 | 2341 | |
59afda78 HH |
2342 | cdev->handler = NULL; |
2343 | ||
1da177e4 LT |
2344 | dasd_remove_sysfs_files(cdev); |
2345 | device = dasd_device_from_cdev(cdev); | |
2346 | if (IS_ERR(device)) | |
2347 | return; | |
2348 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2349 | /* Already doing offline processing */ | |
2350 | dasd_put_device(device); | |
2351 | return; | |
2352 | } | |
2353 | /* | |
2354 | * This device is removed unconditionally. Set offline | |
2355 | * flag to prevent dasd_open from opening it while it is | |
2356 | * no quite down yet. | |
2357 | */ | |
2358 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2359 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2360 | block = device->block; |
2361 | device->block = NULL; | |
1da177e4 | 2362 | dasd_delete_device(device); |
8e09f215 SW |
2363 | /* |
2364 | * life cycle of block is bound to device, so delete it after | |
2365 | * device was safely removed | |
2366 | */ | |
2367 | if (block) | |
2368 | dasd_free_block(block); | |
1da177e4 LT |
2369 | } |
2370 | ||
1c01b8a5 HH |
2371 | /* |
2372 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2373 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2374 | * or the user has started activation through sysfs. |
2375 | */ | |
8e09f215 SW |
2376 | int dasd_generic_set_online(struct ccw_device *cdev, |
2377 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2378 | { |
aa88861f | 2379 | struct dasd_discipline *discipline; |
1da177e4 | 2380 | struct dasd_device *device; |
c6eb7b77 | 2381 | int rc; |
f24acd45 | 2382 | |
40545573 HH |
2383 | /* first online clears initial online feature flag */ |
2384 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2385 | device = dasd_create_device(cdev); |
2386 | if (IS_ERR(device)) | |
2387 | return PTR_ERR(device); | |
2388 | ||
aa88861f | 2389 | discipline = base_discipline; |
c6eb7b77 | 2390 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 2391 | if (!dasd_diag_discipline_pointer) { |
fc19f381 SH |
2392 | pr_warning("%s Setting the DASD online failed because " |
2393 | "of missing DIAG discipline\n", | |
2394 | dev_name(&cdev->dev)); | |
1da177e4 LT |
2395 | dasd_delete_device(device); |
2396 | return -ENODEV; | |
2397 | } | |
2398 | discipline = dasd_diag_discipline_pointer; | |
2399 | } | |
aa88861f PO |
2400 | if (!try_module_get(base_discipline->owner)) { |
2401 | dasd_delete_device(device); | |
2402 | return -EINVAL; | |
2403 | } | |
2404 | if (!try_module_get(discipline->owner)) { | |
2405 | module_put(base_discipline->owner); | |
2406 | dasd_delete_device(device); | |
2407 | return -EINVAL; | |
2408 | } | |
2409 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2410 | device->discipline = discipline; |
2411 | ||
8e09f215 | 2412 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2413 | rc = discipline->check_device(device); |
2414 | if (rc) { | |
fc19f381 SH |
2415 | pr_warning("%s Setting the DASD online with discipline %s " |
2416 | "failed with rc=%i\n", | |
2417 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
2418 | module_put(discipline->owner); |
2419 | module_put(base_discipline->owner); | |
1da177e4 LT |
2420 | dasd_delete_device(device); |
2421 | return rc; | |
2422 | } | |
2423 | ||
2424 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2425 | if (device->state <= DASD_STATE_KNOWN) { | |
fc19f381 SH |
2426 | pr_warning("%s Setting the DASD online failed because of a " |
2427 | "missing discipline\n", dev_name(&cdev->dev)); | |
1da177e4 LT |
2428 | rc = -ENODEV; |
2429 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2430 | if (device->block) |
2431 | dasd_free_block(device->block); | |
1da177e4 LT |
2432 | dasd_delete_device(device); |
2433 | } else | |
2434 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 2435 | dev_name(&cdev->dev)); |
589c74d5 SH |
2436 | |
2437 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2438 | ||
1da177e4 | 2439 | dasd_put_device(device); |
1da177e4 LT |
2440 | return rc; |
2441 | } | |
2442 | ||
8e09f215 | 2443 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2444 | { |
2445 | struct dasd_device *device; | |
8e09f215 | 2446 | struct dasd_block *block; |
dafd87aa | 2447 | int max_count, open_count; |
1da177e4 LT |
2448 | |
2449 | device = dasd_device_from_cdev(cdev); | |
2450 | if (IS_ERR(device)) | |
2451 | return PTR_ERR(device); | |
2452 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2453 | /* Already doing offline processing */ | |
2454 | dasd_put_device(device); | |
2455 | return 0; | |
2456 | } | |
2457 | /* | |
2458 | * We must make sure that this device is currently not in use. | |
2459 | * The open_count is increased for every opener, that includes | |
2460 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2461 | * in the other openers. | |
2462 | */ | |
8e09f215 | 2463 | if (device->block) { |
a806170e HC |
2464 | max_count = device->block->bdev ? 0 : -1; |
2465 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
2466 | if (open_count > max_count) { |
2467 | if (open_count > 0) | |
fc19f381 SH |
2468 | pr_warning("%s: The DASD cannot be set offline " |
2469 | "with open count %i\n", | |
2470 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 2471 | else |
fc19f381 SH |
2472 | pr_warning("%s: The DASD cannot be set offline " |
2473 | "while it is in use\n", | |
2474 | dev_name(&cdev->dev)); | |
8e09f215 SW |
2475 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
2476 | dasd_put_device(device); | |
2477 | return -EBUSY; | |
2478 | } | |
1da177e4 LT |
2479 | } |
2480 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2481 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2482 | block = device->block; |
2483 | device->block = NULL; | |
1da177e4 | 2484 | dasd_delete_device(device); |
8e09f215 SW |
2485 | /* |
2486 | * life cycle of block is bound to device, so delete it after | |
2487 | * device was safely removed | |
2488 | */ | |
2489 | if (block) | |
2490 | dasd_free_block(block); | |
1da177e4 LT |
2491 | return 0; |
2492 | } | |
2493 | ||
8e09f215 | 2494 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2495 | { |
2496 | struct dasd_device *device; | |
2497 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
2498 | int ret; |
2499 | ||
91c36919 | 2500 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
2501 | if (IS_ERR(device)) |
2502 | return 0; | |
1da177e4 LT |
2503 | ret = 0; |
2504 | switch (event) { | |
2505 | case CIO_GONE: | |
47593bfa | 2506 | case CIO_BOXED: |
1da177e4 | 2507 | case CIO_NO_PATH: |
20c64468 SW |
2508 | /* First of all call extended error reporting. */ |
2509 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2510 | ||
1da177e4 LT |
2511 | if (device->state < DASD_STATE_BASIC) |
2512 | break; | |
2513 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2514 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2515 | if (cqr->status == DASD_CQR_IN_IO) { | |
2516 | cqr->status = DASD_CQR_QUEUED; | |
2517 | cqr->retries++; | |
2518 | } | |
eb6e199b | 2519 | dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); |
8e09f215 SW |
2520 | dasd_device_clear_timer(device); |
2521 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2522 | ret = 1; |
2523 | break; | |
2524 | case CIO_OPER: | |
2525 | /* FIXME: add a sanity check. */ | |
eb6e199b | 2526 | dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); |
d41dd122 | 2527 | if (device->stopped & DASD_UNRESUMED_PM) { |
eb6e199b | 2528 | dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); |
d41dd122 SH |
2529 | dasd_restore_device(device); |
2530 | ret = 1; | |
2531 | break; | |
2532 | } | |
8e09f215 SW |
2533 | dasd_schedule_device_bh(device); |
2534 | if (device->block) | |
2535 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2536 | ret = 1; |
2537 | break; | |
2538 | } | |
1da177e4 LT |
2539 | dasd_put_device(device); |
2540 | return ret; | |
2541 | } | |
2542 | ||
d41dd122 SH |
2543 | int dasd_generic_pm_freeze(struct ccw_device *cdev) |
2544 | { | |
2545 | struct dasd_ccw_req *cqr, *n; | |
2546 | int rc; | |
2547 | struct list_head freeze_queue; | |
2548 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2549 | ||
2550 | if (IS_ERR(device)) | |
2551 | return PTR_ERR(device); | |
2552 | /* disallow new I/O */ | |
eb6e199b | 2553 | dasd_device_set_stop_bits(device, DASD_STOPPED_PM); |
d41dd122 SH |
2554 | /* clear active requests */ |
2555 | INIT_LIST_HEAD(&freeze_queue); | |
2556 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2557 | rc = 0; | |
2558 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { | |
2559 | /* Check status and move request to flush_queue */ | |
2560 | if (cqr->status == DASD_CQR_IN_IO) { | |
2561 | rc = device->discipline->term_IO(cqr); | |
2562 | if (rc) { | |
2563 | /* unable to terminate requeust */ | |
2564 | dev_err(&device->cdev->dev, | |
2565 | "Unable to terminate request %p " | |
2566 | "on suspend\n", cqr); | |
2567 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2568 | dasd_put_device(device); | |
2569 | return rc; | |
2570 | } | |
2571 | } | |
2572 | list_move_tail(&cqr->devlist, &freeze_queue); | |
2573 | } | |
2574 | ||
2575 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2576 | ||
2577 | list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { | |
2578 | wait_event(dasd_flush_wq, | |
2579 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
2580 | if (cqr->status == DASD_CQR_CLEARED) | |
2581 | cqr->status = DASD_CQR_QUEUED; | |
2582 | } | |
2583 | /* move freeze_queue to start of the ccw_queue */ | |
2584 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
2585 | list_splice_tail(&freeze_queue, &device->ccw_queue); | |
2586 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
2587 | ||
2588 | if (device->discipline->freeze) | |
2589 | rc = device->discipline->freeze(device); | |
2590 | ||
2591 | dasd_put_device(device); | |
2592 | return rc; | |
2593 | } | |
2594 | EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); | |
2595 | ||
2596 | int dasd_generic_restore_device(struct ccw_device *cdev) | |
2597 | { | |
2598 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
2599 | int rc = 0; | |
2600 | ||
2601 | if (IS_ERR(device)) | |
2602 | return PTR_ERR(device); | |
2603 | ||
e6125fba | 2604 | /* allow new IO again */ |
eb6e199b SW |
2605 | dasd_device_remove_stop_bits(device, |
2606 | (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); | |
e6125fba | 2607 | |
d41dd122 | 2608 | dasd_schedule_device_bh(device); |
d41dd122 | 2609 | |
eb6e199b SW |
2610 | /* |
2611 | * call discipline restore function | |
2612 | * if device is stopped do nothing e.g. for disconnected devices | |
2613 | */ | |
2614 | if (device->discipline->restore && !(device->stopped)) | |
d41dd122 | 2615 | rc = device->discipline->restore(device); |
eb6e199b | 2616 | if (rc || device->stopped) |
e6125fba SH |
2617 | /* |
2618 | * if the resume failed for the DASD we put it in | |
2619 | * an UNRESUMED stop state | |
2620 | */ | |
2621 | device->stopped |= DASD_UNRESUMED_PM; | |
d41dd122 | 2622 | |
6fca97a9 SH |
2623 | if (device->block) |
2624 | dasd_schedule_block_bh(device->block); | |
2625 | ||
d41dd122 | 2626 | dasd_put_device(device); |
e6125fba | 2627 | return 0; |
d41dd122 SH |
2628 | } |
2629 | EXPORT_SYMBOL_GPL(dasd_generic_restore_device); | |
2630 | ||
763968e2 HC |
2631 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2632 | void *rdc_buffer, | |
2633 | int rdc_buffer_size, | |
68b781fe | 2634 | int magic) |
17283b56 CH |
2635 | { |
2636 | struct dasd_ccw_req *cqr; | |
2637 | struct ccw1 *ccw; | |
d9fa9441 | 2638 | unsigned long *idaw; |
17283b56 CH |
2639 | |
2640 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2641 | ||
2642 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
2643 | /* internal error 13 - Allocating the RDC request failed*/ |
2644 | dev_err(&device->cdev->dev, | |
2645 | "An error occurred in the DASD device driver, " | |
2646 | "reason=%s\n", "13"); | |
17283b56 CH |
2647 | return cqr; |
2648 | } | |
2649 | ||
2650 | ccw = cqr->cpaddr; | |
2651 | ccw->cmd_code = CCW_CMD_RDC; | |
d9fa9441 SH |
2652 | if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { |
2653 | idaw = (unsigned long *) (cqr->data); | |
2654 | ccw->cda = (__u32)(addr_t) idaw; | |
2655 | ccw->flags = CCW_FLAG_IDA; | |
2656 | idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); | |
2657 | } else { | |
2658 | ccw->cda = (__u32)(addr_t) rdc_buffer; | |
2659 | ccw->flags = 0; | |
2660 | } | |
17283b56 | 2661 | |
d9fa9441 | 2662 | ccw->count = rdc_buffer_size; |
8e09f215 SW |
2663 | cqr->startdev = device; |
2664 | cqr->memdev = device; | |
17283b56 | 2665 | cqr->expires = 10*HZ; |
eb6e199b | 2666 | cqr->retries = 256; |
17283b56 CH |
2667 | cqr->buildclk = get_clock(); |
2668 | cqr->status = DASD_CQR_FILLED; | |
2669 | return cqr; | |
2670 | } | |
2671 | ||
2672 | ||
68b781fe | 2673 | int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
92636b15 | 2674 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
2675 | { |
2676 | int ret; | |
2677 | struct dasd_ccw_req *cqr; | |
2678 | ||
92636b15 | 2679 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
2680 | magic); |
2681 | if (IS_ERR(cqr)) | |
2682 | return PTR_ERR(cqr); | |
2683 | ||
2684 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2685 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2686 | return ret; |
2687 | } | |
aaff0f64 | 2688 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2689 | |
f3eb5384 SW |
2690 | /* |
2691 | * In command mode and transport mode we need to look for sense | |
2692 | * data in different places. The sense data itself is allways | |
2693 | * an array of 32 bytes, so we can unify the sense data access | |
2694 | * for both modes. | |
2695 | */ | |
2696 | char *dasd_get_sense(struct irb *irb) | |
2697 | { | |
2698 | struct tsb *tsb = NULL; | |
2699 | char *sense = NULL; | |
2700 | ||
2701 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
2702 | if (irb->scsw.tm.tcw) | |
2703 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
2704 | irb->scsw.tm.tcw); | |
2705 | if (tsb && tsb->length == 64 && tsb->flags) | |
2706 | switch (tsb->flags & 0x07) { | |
2707 | case 1: /* tsa_iostat */ | |
2708 | sense = tsb->tsa.iostat.sense; | |
2709 | break; | |
2710 | case 2: /* tsa_ddpc */ | |
2711 | sense = tsb->tsa.ddpc.sense; | |
2712 | break; | |
2713 | default: | |
2714 | /* currently we don't use interrogate data */ | |
2715 | break; | |
2716 | } | |
2717 | } else if (irb->esw.esw0.erw.cons) { | |
2718 | sense = irb->ecw; | |
2719 | } | |
2720 | return sense; | |
2721 | } | |
2722 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
2723 | ||
8e09f215 | 2724 | static int __init dasd_init(void) |
1da177e4 LT |
2725 | { |
2726 | int rc; | |
2727 | ||
2728 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2729 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 2730 | init_waitqueue_head(&generic_waitq); |
1da177e4 LT |
2731 | |
2732 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2733 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2734 | if (dasd_debug_area == NULL) { |
2735 | rc = -ENOMEM; | |
2736 | goto failed; | |
2737 | } | |
2738 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2739 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2740 | |
2741 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2742 | ||
2743 | dasd_diag_discipline_pointer = NULL; | |
2744 | ||
1da177e4 LT |
2745 | rc = dasd_devmap_init(); |
2746 | if (rc) | |
2747 | goto failed; | |
2748 | rc = dasd_gendisk_init(); | |
2749 | if (rc) | |
2750 | goto failed; | |
2751 | rc = dasd_parse(); | |
2752 | if (rc) | |
2753 | goto failed; | |
20c64468 SW |
2754 | rc = dasd_eer_init(); |
2755 | if (rc) | |
2756 | goto failed; | |
1da177e4 LT |
2757 | #ifdef CONFIG_PROC_FS |
2758 | rc = dasd_proc_init(); | |
2759 | if (rc) | |
2760 | goto failed; | |
2761 | #endif | |
2762 | ||
2763 | return 0; | |
2764 | failed: | |
fc19f381 | 2765 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
2766 | dasd_exit(); |
2767 | return rc; | |
2768 | } | |
2769 | ||
2770 | module_init(dasd_init); | |
2771 | module_exit(dasd_exit); | |
2772 | ||
2773 | EXPORT_SYMBOL(dasd_debug_area); | |
2774 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2775 | ||
2776 | EXPORT_SYMBOL(dasd_add_request_head); | |
2777 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2778 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2779 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2780 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2781 | EXPORT_SYMBOL(dasd_enable_device); |
2782 | EXPORT_SYMBOL(dasd_int_handler); | |
2783 | EXPORT_SYMBOL(dasd_kfree_request); | |
2784 | EXPORT_SYMBOL(dasd_kick_device); | |
2785 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2786 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2787 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2788 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2789 | EXPORT_SYMBOL(dasd_device_set_timer); |
2790 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2791 | EXPORT_SYMBOL(dasd_sfree_request); |
2792 | EXPORT_SYMBOL(dasd_sleep_on); | |
2793 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2794 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2795 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2796 | EXPORT_SYMBOL(dasd_start_IO); | |
2797 | EXPORT_SYMBOL(dasd_term_IO); | |
2798 | ||
2799 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2800 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2801 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2802 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2803 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2804 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2805 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2806 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2807 | EXPORT_SYMBOL_GPL(dasd_free_block); |