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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
3 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
4 | * Carsten Otte <Cotte@de.ibm.com> | |
5 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
6 | * Bugreports.to..: <Linux390@de.ibm.com> | |
d41dd122 | 7 | * Copyright IBM Corp. 1999, 2009 |
1da177e4 LT |
8 | */ |
9 | ||
fc19f381 SH |
10 | #define KMSG_COMPONENT "dasd" |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
1da177e4 LT |
13 | #include <linux/kmod.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/ctype.h> | |
17 | #include <linux/major.h> | |
18 | #include <linux/slab.h> | |
a885c8c4 | 19 | #include <linux/hdreg.h> |
f3445a1a | 20 | #include <linux/async.h> |
9eb25122 | 21 | #include <linux/mutex.h> |
4fa52aa7 SW |
22 | #include <linux/debugfs.h> |
23 | #include <linux/seq_file.h> | |
e4258d55 | 24 | #include <linux/vmalloc.h> |
1da177e4 LT |
25 | |
26 | #include <asm/ccwdev.h> | |
27 | #include <asm/ebcdic.h> | |
28 | #include <asm/idals.h> | |
f3eb5384 | 29 | #include <asm/itcw.h> |
33b62a30 | 30 | #include <asm/diag.h> |
1da177e4 LT |
31 | |
32 | /* This is ugly... */ | |
33 | #define PRINTK_HEADER "dasd:" | |
34 | ||
35 | #include "dasd_int.h" | |
36 | /* | |
37 | * SECTION: Constant definitions to be used within this file | |
38 | */ | |
39 | #define DASD_CHANQ_MAX_SIZE 4 | |
40 | ||
41 | /* | |
42 | * SECTION: exported variables of dasd.c | |
43 | */ | |
44 | debug_info_t *dasd_debug_area; | |
7048a2b5 | 45 | EXPORT_SYMBOL(dasd_debug_area); |
4fa52aa7 | 46 | static struct dentry *dasd_debugfs_root_entry; |
1da177e4 | 47 | struct dasd_discipline *dasd_diag_discipline_pointer; |
7048a2b5 | 48 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); |
2b67fc46 | 49 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
50 | |
51 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
52 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
a53c8fab | 53 | " Copyright IBM Corp. 2000"); |
1da177e4 | 54 | MODULE_SUPPORTED_DEVICE("dasd"); |
1da177e4 LT |
55 | MODULE_LICENSE("GPL"); |
56 | ||
57 | /* | |
58 | * SECTION: prototypes for static functions of dasd.c | |
59 | */ | |
8e09f215 SW |
60 | static int dasd_alloc_queue(struct dasd_block *); |
61 | static void dasd_setup_queue(struct dasd_block *); | |
62 | static void dasd_free_queue(struct dasd_block *); | |
63 | static void dasd_flush_request_queue(struct dasd_block *); | |
64 | static int dasd_flush_block_queue(struct dasd_block *); | |
65 | static void dasd_device_tasklet(struct dasd_device *); | |
66 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 67 | static void do_kick_device(struct work_struct *); |
d41dd122 | 68 | static void do_restore_device(struct work_struct *); |
501183f2 | 69 | static void do_reload_device(struct work_struct *); |
8e09f215 | 70 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
71 | static void dasd_device_timeout(unsigned long); |
72 | static void dasd_block_timeout(unsigned long); | |
eb6e199b | 73 | static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); |
4fa52aa7 SW |
74 | static void dasd_profile_init(struct dasd_profile *, struct dentry *); |
75 | static void dasd_profile_exit(struct dasd_profile *); | |
1da177e4 LT |
76 | |
77 | /* | |
78 | * SECTION: Operations on the device structure. | |
79 | */ | |
80 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 81 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 82 | static wait_queue_head_t generic_waitq; |
4679e893 | 83 | static wait_queue_head_t shutdown_waitq; |
1da177e4 LT |
84 | |
85 | /* | |
86 | * Allocate memory for a new device structure. | |
87 | */ | |
8e09f215 | 88 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
89 | { |
90 | struct dasd_device *device; | |
91 | ||
8e09f215 SW |
92 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
93 | if (!device) | |
1da177e4 | 94 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
95 | |
96 | /* Get two pages for normal block device operations. */ | |
97 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 98 | if (!device->ccw_mem) { |
1da177e4 LT |
99 | kfree(device); |
100 | return ERR_PTR(-ENOMEM); | |
101 | } | |
102 | /* Get one page for error recovery. */ | |
103 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 104 | if (!device->erp_mem) { |
1da177e4 LT |
105 | free_pages((unsigned long) device->ccw_mem, 1); |
106 | kfree(device); | |
107 | return ERR_PTR(-ENOMEM); | |
108 | } | |
109 | ||
110 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
111 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
112 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 113 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 114 | tasklet_init(&device->tasklet, |
8e09f215 | 115 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
116 | (unsigned long) device); |
117 | INIT_LIST_HEAD(&device->ccw_queue); | |
118 | init_timer(&device->timer); | |
48cae885 SW |
119 | device->timer.function = dasd_device_timeout; |
120 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 121 | INIT_WORK(&device->kick_work, do_kick_device); |
d41dd122 | 122 | INIT_WORK(&device->restore_device, do_restore_device); |
501183f2 | 123 | INIT_WORK(&device->reload_device, do_reload_device); |
1da177e4 LT |
124 | device->state = DASD_STATE_NEW; |
125 | device->target = DASD_STATE_NEW; | |
9eb25122 | 126 | mutex_init(&device->state_mutex); |
4fa52aa7 | 127 | spin_lock_init(&device->profile.lock); |
1da177e4 LT |
128 | return device; |
129 | } | |
130 | ||
131 | /* | |
132 | * Free memory of a device structure. | |
133 | */ | |
8e09f215 | 134 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 135 | { |
17fd682e | 136 | kfree(device->private); |
1da177e4 LT |
137 | free_page((unsigned long) device->erp_mem); |
138 | free_pages((unsigned long) device->ccw_mem, 1); | |
139 | kfree(device); | |
140 | } | |
141 | ||
8e09f215 SW |
142 | /* |
143 | * Allocate memory for a new device structure. | |
144 | */ | |
145 | struct dasd_block *dasd_alloc_block(void) | |
146 | { | |
147 | struct dasd_block *block; | |
148 | ||
149 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
150 | if (!block) | |
151 | return ERR_PTR(-ENOMEM); | |
152 | /* open_count = 0 means device online but not in use */ | |
153 | atomic_set(&block->open_count, -1); | |
154 | ||
155 | spin_lock_init(&block->request_queue_lock); | |
156 | atomic_set(&block->tasklet_scheduled, 0); | |
157 | tasklet_init(&block->tasklet, | |
158 | (void (*)(unsigned long)) dasd_block_tasklet, | |
159 | (unsigned long) block); | |
160 | INIT_LIST_HEAD(&block->ccw_queue); | |
161 | spin_lock_init(&block->queue_lock); | |
162 | init_timer(&block->timer); | |
48cae885 SW |
163 | block->timer.function = dasd_block_timeout; |
164 | block->timer.data = (unsigned long) block; | |
4fa52aa7 | 165 | spin_lock_init(&block->profile.lock); |
8e09f215 SW |
166 | |
167 | return block; | |
168 | } | |
7048a2b5 | 169 | EXPORT_SYMBOL_GPL(dasd_alloc_block); |
8e09f215 SW |
170 | |
171 | /* | |
172 | * Free memory of a device structure. | |
173 | */ | |
174 | void dasd_free_block(struct dasd_block *block) | |
175 | { | |
176 | kfree(block); | |
177 | } | |
7048a2b5 | 178 | EXPORT_SYMBOL_GPL(dasd_free_block); |
8e09f215 | 179 | |
1da177e4 LT |
180 | /* |
181 | * Make a new device known to the system. | |
182 | */ | |
8e09f215 | 183 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
184 | { |
185 | int rc; | |
186 | ||
187 | /* | |
138c014d | 188 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
189 | * keep the reference count > 0. |
190 | */ | |
191 | dasd_get_device(device); | |
192 | ||
8e09f215 SW |
193 | if (device->block) { |
194 | rc = dasd_alloc_queue(device->block); | |
195 | if (rc) { | |
196 | dasd_put_device(device); | |
197 | return rc; | |
198 | } | |
1da177e4 | 199 | } |
1da177e4 LT |
200 | device->state = DASD_STATE_KNOWN; |
201 | return 0; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Let the system forget about a device. | |
206 | */ | |
8e09f215 | 207 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 208 | { |
20c64468 SW |
209 | /* Disable extended error reporting for this device. */ |
210 | dasd_eer_disable(device); | |
1da177e4 | 211 | /* Forget the discipline information. */ |
8e09f215 SW |
212 | if (device->discipline) { |
213 | if (device->discipline->uncheck_device) | |
214 | device->discipline->uncheck_device(device); | |
aa88861f | 215 | module_put(device->discipline->owner); |
8e09f215 | 216 | } |
1da177e4 | 217 | device->discipline = NULL; |
aa88861f PO |
218 | if (device->base_discipline) |
219 | module_put(device->base_discipline->owner); | |
220 | device->base_discipline = NULL; | |
1da177e4 LT |
221 | device->state = DASD_STATE_NEW; |
222 | ||
8e09f215 SW |
223 | if (device->block) |
224 | dasd_free_queue(device->block); | |
1da177e4 LT |
225 | |
226 | /* Give up reference we took in dasd_state_new_to_known. */ | |
227 | dasd_put_device(device); | |
8f61701b | 228 | return 0; |
1da177e4 LT |
229 | } |
230 | ||
4fa52aa7 SW |
231 | static struct dentry *dasd_debugfs_setup(const char *name, |
232 | struct dentry *base_dentry) | |
233 | { | |
234 | struct dentry *pde; | |
235 | ||
236 | if (!base_dentry) | |
237 | return NULL; | |
238 | pde = debugfs_create_dir(name, base_dentry); | |
239 | if (!pde || IS_ERR(pde)) | |
240 | return NULL; | |
241 | return pde; | |
242 | } | |
243 | ||
1da177e4 LT |
244 | /* |
245 | * Request the irq line for the device. | |
246 | */ | |
8e09f215 | 247 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 | 248 | { |
4fa52aa7 | 249 | struct dasd_block *block = device->block; |
d42e1712 | 250 | int rc = 0; |
1da177e4 LT |
251 | |
252 | /* Allocate and register gendisk structure. */ | |
4fa52aa7 SW |
253 | if (block) { |
254 | rc = dasd_gendisk_alloc(block); | |
8e09f215 SW |
255 | if (rc) |
256 | return rc; | |
4fa52aa7 SW |
257 | block->debugfs_dentry = |
258 | dasd_debugfs_setup(block->gdp->disk_name, | |
259 | dasd_debugfs_root_entry); | |
260 | dasd_profile_init(&block->profile, block->debugfs_dentry); | |
261 | if (dasd_global_profile_level == DASD_PROFILE_ON) | |
262 | dasd_profile_on(&device->block->profile); | |
263 | } | |
264 | device->debugfs_dentry = | |
265 | dasd_debugfs_setup(dev_name(&device->cdev->dev), | |
266 | dasd_debugfs_root_entry); | |
267 | dasd_profile_init(&device->profile, device->debugfs_dentry); | |
268 | ||
1da177e4 | 269 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 270 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 271 | 8 * sizeof(long)); |
1da177e4 | 272 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 273 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
274 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
275 | ||
276 | device->state = DASD_STATE_BASIC; | |
d42e1712 SH |
277 | |
278 | return rc; | |
1da177e4 LT |
279 | } |
280 | ||
281 | /* | |
282 | * Release the irq line for the device. Terminate any running i/o. | |
283 | */ | |
8e09f215 | 284 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 285 | { |
8f61701b | 286 | int rc; |
d42e1712 | 287 | |
8e09f215 | 288 | if (device->block) { |
4fa52aa7 | 289 | dasd_profile_exit(&device->block->profile); |
d7309aaa | 290 | debugfs_remove(device->block->debugfs_dentry); |
8e09f215 SW |
291 | dasd_gendisk_free(device->block); |
292 | dasd_block_clear_timer(device->block); | |
293 | } | |
294 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
295 | if (rc) |
296 | return rc; | |
8e09f215 | 297 | dasd_device_clear_timer(device); |
4fa52aa7 | 298 | dasd_profile_exit(&device->profile); |
d7309aaa | 299 | debugfs_remove(device->debugfs_dentry); |
1da177e4 LT |
300 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
301 | if (device->debug_area != NULL) { | |
302 | debug_unregister(device->debug_area); | |
303 | device->debug_area = NULL; | |
304 | } | |
305 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 306 | return 0; |
1da177e4 LT |
307 | } |
308 | ||
309 | /* | |
310 | * Do the initial analysis. The do_analysis function may return | |
311 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
312 | * until the discipline decides to continue the startup sequence | |
313 | * by calling the function dasd_change_state. The eckd disciplines | |
314 | * uses this to start a ccw that detects the format. The completion | |
315 | * interrupt for this detection ccw uses the kernel event daemon to | |
316 | * trigger the call to dasd_change_state. All this is done in the | |
317 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
318 | * After the analysis ccw is done (do_analysis returned 0) the block |
319 | * device is setup. | |
320 | * In case the analysis returns an error, the device setup is stopped | |
321 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 322 | */ |
8e09f215 | 323 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
324 | { |
325 | int rc; | |
8e09f215 | 326 | struct dasd_block *block; |
1da177e4 LT |
327 | |
328 | rc = 0; | |
8e09f215 | 329 | block = device->block; |
90f0094d | 330 | /* make disk known with correct capacity */ |
8e09f215 SW |
331 | if (block) { |
332 | if (block->base->discipline->do_analysis != NULL) | |
333 | rc = block->base->discipline->do_analysis(block); | |
334 | if (rc) { | |
d42e1712 | 335 | if (rc != -EAGAIN) { |
8e09f215 | 336 | device->state = DASD_STATE_UNFMT; |
d42e1712 SH |
337 | goto out; |
338 | } | |
8e09f215 SW |
339 | return rc; |
340 | } | |
341 | dasd_setup_queue(block); | |
342 | set_capacity(block->gdp, | |
343 | block->blocks << block->s2b_shift); | |
344 | device->state = DASD_STATE_READY; | |
345 | rc = dasd_scan_partitions(block); | |
d42e1712 | 346 | if (rc) { |
8e09f215 | 347 | device->state = DASD_STATE_BASIC; |
d42e1712 SH |
348 | return rc; |
349 | } | |
8e09f215 SW |
350 | } else { |
351 | device->state = DASD_STATE_READY; | |
352 | } | |
d42e1712 SH |
353 | out: |
354 | if (device->discipline->basic_to_ready) | |
355 | rc = device->discipline->basic_to_ready(device); | |
90f0094d | 356 | return rc; |
1da177e4 LT |
357 | } |
358 | ||
d07dc5d8 SH |
359 | static inline |
360 | int _wait_for_empty_queues(struct dasd_device *device) | |
361 | { | |
362 | if (device->block) | |
363 | return list_empty(&device->ccw_queue) && | |
364 | list_empty(&device->block->ccw_queue); | |
365 | else | |
366 | return list_empty(&device->ccw_queue); | |
367 | } | |
368 | ||
1da177e4 LT |
369 | /* |
370 | * Remove device from block device layer. Destroy dirty buffers. | |
371 | * Forget format information. Check if the target level is basic | |
372 | * and if it is create fake disk for formatting. | |
373 | */ | |
8e09f215 | 374 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 375 | { |
8f61701b HH |
376 | int rc; |
377 | ||
d42e1712 SH |
378 | if (device->discipline->ready_to_basic) { |
379 | rc = device->discipline->ready_to_basic(device); | |
380 | if (rc) | |
381 | return rc; | |
382 | } | |
1da177e4 | 383 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
384 | if (device->block) { |
385 | struct dasd_block *block = device->block; | |
386 | rc = dasd_flush_block_queue(block); | |
387 | if (rc) { | |
388 | device->state = DASD_STATE_READY; | |
389 | return rc; | |
390 | } | |
8e09f215 | 391 | dasd_flush_request_queue(block); |
b695adfa | 392 | dasd_destroy_partitions(block); |
8e09f215 SW |
393 | block->blocks = 0; |
394 | block->bp_block = 0; | |
395 | block->s2b_shift = 0; | |
396 | } | |
8f61701b | 397 | return 0; |
1da177e4 LT |
398 | } |
399 | ||
90f0094d HH |
400 | /* |
401 | * Back to basic. | |
402 | */ | |
8e09f215 | 403 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
404 | { |
405 | device->state = DASD_STATE_BASIC; | |
8f61701b | 406 | return 0; |
90f0094d HH |
407 | } |
408 | ||
1da177e4 LT |
409 | /* |
410 | * Make the device online and schedule the bottom half to start | |
411 | * the requeueing of requests from the linux request queue to the | |
412 | * ccw queue. | |
413 | */ | |
8f61701b | 414 | static int |
1da177e4 LT |
415 | dasd_state_ready_to_online(struct dasd_device * device) |
416 | { | |
1301809b SW |
417 | struct gendisk *disk; |
418 | struct disk_part_iter piter; | |
419 | struct hd_struct *part; | |
8e09f215 | 420 | |
1da177e4 | 421 | device->state = DASD_STATE_ONLINE; |
1301809b | 422 | if (device->block) { |
8e09f215 | 423 | dasd_schedule_block_bh(device->block); |
e4dbb0f2 SH |
424 | if ((device->features & DASD_FEATURE_USERAW)) { |
425 | disk = device->block->gdp; | |
426 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
427 | return 0; | |
428 | } | |
1301809b SW |
429 | disk = device->block->bdev->bd_disk; |
430 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
431 | while ((part = disk_part_iter_next(&piter))) | |
432 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
433 | disk_part_iter_exit(&piter); | |
434 | } | |
1da177e4 LT |
435 | return 0; |
436 | } | |
437 | ||
438 | /* | |
439 | * Stop the requeueing of requests again. | |
440 | */ | |
8e09f215 | 441 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 442 | { |
8e09f215 | 443 | int rc; |
1301809b SW |
444 | struct gendisk *disk; |
445 | struct disk_part_iter piter; | |
446 | struct hd_struct *part; | |
8e09f215 SW |
447 | |
448 | if (device->discipline->online_to_ready) { | |
449 | rc = device->discipline->online_to_ready(device); | |
450 | if (rc) | |
451 | return rc; | |
452 | } | |
d42e1712 | 453 | |
1da177e4 | 454 | device->state = DASD_STATE_READY; |
e4dbb0f2 | 455 | if (device->block && !(device->features & DASD_FEATURE_USERAW)) { |
1301809b SW |
456 | disk = device->block->bdev->bd_disk; |
457 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
458 | while ((part = disk_part_iter_next(&piter))) | |
459 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
460 | disk_part_iter_exit(&piter); | |
461 | } | |
8f61701b | 462 | return 0; |
1da177e4 LT |
463 | } |
464 | ||
465 | /* | |
466 | * Device startup state changes. | |
467 | */ | |
8e09f215 | 468 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
469 | { |
470 | int rc; | |
471 | ||
472 | rc = 0; | |
473 | if (device->state == DASD_STATE_NEW && | |
474 | device->target >= DASD_STATE_KNOWN) | |
475 | rc = dasd_state_new_to_known(device); | |
476 | ||
477 | if (!rc && | |
478 | device->state == DASD_STATE_KNOWN && | |
479 | device->target >= DASD_STATE_BASIC) | |
480 | rc = dasd_state_known_to_basic(device); | |
481 | ||
482 | if (!rc && | |
483 | device->state == DASD_STATE_BASIC && | |
484 | device->target >= DASD_STATE_READY) | |
485 | rc = dasd_state_basic_to_ready(device); | |
486 | ||
39ccf95e HH |
487 | if (!rc && |
488 | device->state == DASD_STATE_UNFMT && | |
489 | device->target > DASD_STATE_UNFMT) | |
490 | rc = -EPERM; | |
491 | ||
1da177e4 LT |
492 | if (!rc && |
493 | device->state == DASD_STATE_READY && | |
494 | device->target >= DASD_STATE_ONLINE) | |
495 | rc = dasd_state_ready_to_online(device); | |
496 | ||
497 | return rc; | |
498 | } | |
499 | ||
500 | /* | |
501 | * Device shutdown state changes. | |
502 | */ | |
8e09f215 | 503 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 504 | { |
8f61701b HH |
505 | int rc; |
506 | ||
507 | rc = 0; | |
1da177e4 LT |
508 | if (device->state == DASD_STATE_ONLINE && |
509 | device->target <= DASD_STATE_READY) | |
8f61701b | 510 | rc = dasd_state_online_to_ready(device); |
138c014d | 511 | |
8f61701b HH |
512 | if (!rc && |
513 | device->state == DASD_STATE_READY && | |
1da177e4 | 514 | device->target <= DASD_STATE_BASIC) |
8f61701b | 515 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 516 | |
8f61701b HH |
517 | if (!rc && |
518 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 519 | device->target <= DASD_STATE_BASIC) |
8f61701b | 520 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 521 | |
8f61701b HH |
522 | if (!rc && |
523 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 524 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 525 | rc = dasd_state_basic_to_known(device); |
138c014d | 526 | |
8f61701b HH |
527 | if (!rc && |
528 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 529 | device->target <= DASD_STATE_NEW) |
8f61701b | 530 | rc = dasd_state_known_to_new(device); |
1da177e4 | 531 | |
8f61701b | 532 | return rc; |
1da177e4 LT |
533 | } |
534 | ||
535 | /* | |
536 | * This is the main startup/shutdown routine. | |
537 | */ | |
8e09f215 | 538 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 | 539 | { |
181d9522 | 540 | int rc; |
1da177e4 LT |
541 | |
542 | if (device->state == device->target) | |
543 | /* Already where we want to go today... */ | |
544 | return; | |
545 | if (device->state < device->target) | |
546 | rc = dasd_increase_state(device); | |
547 | else | |
548 | rc = dasd_decrease_state(device); | |
181d9522 SO |
549 | if (rc == -EAGAIN) |
550 | return; | |
551 | if (rc) | |
552 | device->target = device->state; | |
1da177e4 | 553 | |
4dfd5c45 HH |
554 | /* let user-space know that the device status changed */ |
555 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1f08be80 SO |
556 | |
557 | if (device->state == device->target) | |
558 | wake_up(&dasd_init_waitq); | |
1da177e4 LT |
559 | } |
560 | ||
561 | /* | |
562 | * Kick starter for devices that did not complete the startup/shutdown | |
563 | * procedure or were sleeping because of a pending state. | |
564 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
565 | * event daemon. | |
566 | */ | |
8e09f215 | 567 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 568 | { |
4927b3f7 | 569 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
9eb25122 | 570 | mutex_lock(&device->state_mutex); |
1da177e4 | 571 | dasd_change_state(device); |
9eb25122 | 572 | mutex_unlock(&device->state_mutex); |
8e09f215 | 573 | dasd_schedule_device_bh(device); |
1da177e4 LT |
574 | dasd_put_device(device); |
575 | } | |
576 | ||
8e09f215 | 577 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
578 | { |
579 | dasd_get_device(device); | |
580 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
581 | schedule_work(&device->kick_work); | |
582 | } | |
7048a2b5 | 583 | EXPORT_SYMBOL(dasd_kick_device); |
1da177e4 | 584 | |
501183f2 SH |
585 | /* |
586 | * dasd_reload_device will schedule a call do do_reload_device to the kernel | |
587 | * event daemon. | |
588 | */ | |
589 | static void do_reload_device(struct work_struct *work) | |
590 | { | |
591 | struct dasd_device *device = container_of(work, struct dasd_device, | |
592 | reload_device); | |
593 | device->discipline->reload(device); | |
594 | dasd_put_device(device); | |
595 | } | |
596 | ||
597 | void dasd_reload_device(struct dasd_device *device) | |
598 | { | |
599 | dasd_get_device(device); | |
600 | /* queue call to dasd_reload_device to the kernel event daemon. */ | |
601 | schedule_work(&device->reload_device); | |
602 | } | |
603 | EXPORT_SYMBOL(dasd_reload_device); | |
604 | ||
d41dd122 SH |
605 | /* |
606 | * dasd_restore_device will schedule a call do do_restore_device to the kernel | |
607 | * event daemon. | |
608 | */ | |
609 | static void do_restore_device(struct work_struct *work) | |
610 | { | |
611 | struct dasd_device *device = container_of(work, struct dasd_device, | |
612 | restore_device); | |
613 | device->cdev->drv->restore(device->cdev); | |
614 | dasd_put_device(device); | |
615 | } | |
616 | ||
617 | void dasd_restore_device(struct dasd_device *device) | |
618 | { | |
619 | dasd_get_device(device); | |
620 | /* queue call to dasd_restore_device to the kernel event daemon. */ | |
621 | schedule_work(&device->restore_device); | |
622 | } | |
623 | ||
1da177e4 LT |
624 | /* |
625 | * Set the target state for a device and starts the state change. | |
626 | */ | |
8e09f215 | 627 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 628 | { |
f3445a1a | 629 | dasd_get_device(device); |
9eb25122 | 630 | mutex_lock(&device->state_mutex); |
1da177e4 LT |
631 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
632 | if (dasd_probeonly && target > DASD_STATE_READY) | |
633 | target = DASD_STATE_READY; | |
634 | if (device->target != target) { | |
9eb25122 | 635 | if (device->state == target) |
1da177e4 LT |
636 | wake_up(&dasd_init_waitq); |
637 | device->target = target; | |
638 | } | |
639 | if (device->state != device->target) | |
640 | dasd_change_state(device); | |
9eb25122 SH |
641 | mutex_unlock(&device->state_mutex); |
642 | dasd_put_device(device); | |
1da177e4 | 643 | } |
7048a2b5 | 644 | EXPORT_SYMBOL(dasd_set_target_state); |
1da177e4 LT |
645 | |
646 | /* | |
647 | * Enable devices with device numbers in [from..to]. | |
648 | */ | |
8e09f215 | 649 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
650 | { |
651 | return (device->state == device->target); | |
652 | } | |
653 | ||
8e09f215 | 654 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
655 | { |
656 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
657 | if (device->state <= DASD_STATE_KNOWN) | |
658 | /* No discipline for device found. */ | |
659 | dasd_set_target_state(device, DASD_STATE_NEW); | |
660 | /* Now wait for the devices to come up. */ | |
661 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
25e2cf1c SH |
662 | |
663 | dasd_reload_device(device); | |
664 | if (device->discipline->kick_validate) | |
665 | device->discipline->kick_validate(device); | |
1da177e4 | 666 | } |
7048a2b5 | 667 | EXPORT_SYMBOL(dasd_enable_device); |
1da177e4 LT |
668 | |
669 | /* | |
670 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
671 | */ | |
1da177e4 | 672 | |
4fa52aa7 | 673 | unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; |
1da177e4 | 674 | |
4fa52aa7 SW |
675 | #ifdef CONFIG_DASD_PROFILE |
676 | struct dasd_profile_info dasd_global_profile_data; | |
677 | static struct dentry *dasd_global_profile_dentry; | |
678 | static struct dentry *dasd_debugfs_global_entry; | |
1da177e4 LT |
679 | |
680 | /* | |
681 | * Add profiling information for cqr before execution. | |
682 | */ | |
8e09f215 SW |
683 | static void dasd_profile_start(struct dasd_block *block, |
684 | struct dasd_ccw_req *cqr, | |
685 | struct request *req) | |
1da177e4 LT |
686 | { |
687 | struct list_head *l; | |
688 | unsigned int counter; | |
4fa52aa7 | 689 | struct dasd_device *device; |
1da177e4 LT |
690 | |
691 | /* count the length of the chanq for statistics */ | |
692 | counter = 0; | |
4fa52aa7 SW |
693 | if (dasd_global_profile_level || block->profile.data) |
694 | list_for_each(l, &block->ccw_queue) | |
695 | if (++counter >= 31) | |
696 | break; | |
697 | ||
698 | if (dasd_global_profile_level) { | |
699 | dasd_global_profile_data.dasd_io_nr_req[counter]++; | |
700 | if (rq_data_dir(req) == READ) | |
701 | dasd_global_profile_data.dasd_read_nr_req[counter]++; | |
702 | } | |
703 | ||
704 | spin_lock(&block->profile.lock); | |
c81a90c8 | 705 | if (block->profile.data) { |
4fa52aa7 SW |
706 | block->profile.data->dasd_io_nr_req[counter]++; |
707 | if (rq_data_dir(req) == READ) | |
708 | block->profile.data->dasd_read_nr_req[counter]++; | |
c81a90c8 | 709 | } |
4fa52aa7 SW |
710 | spin_unlock(&block->profile.lock); |
711 | ||
712 | /* | |
713 | * We count the request for the start device, even though it may run on | |
714 | * some other device due to error recovery. This way we make sure that | |
715 | * we count each request only once. | |
716 | */ | |
717 | device = cqr->startdev; | |
718 | if (device->profile.data) { | |
719 | counter = 1; /* request is not yet queued on the start device */ | |
720 | list_for_each(l, &device->ccw_queue) | |
721 | if (++counter >= 31) | |
722 | break; | |
723 | } | |
724 | spin_lock(&device->profile.lock); | |
725 | if (device->profile.data) { | |
726 | device->profile.data->dasd_io_nr_req[counter]++; | |
727 | if (rq_data_dir(req) == READ) | |
728 | device->profile.data->dasd_read_nr_req[counter]++; | |
729 | } | |
730 | spin_unlock(&device->profile.lock); | |
1da177e4 LT |
731 | } |
732 | ||
733 | /* | |
734 | * Add profiling information for cqr after execution. | |
735 | */ | |
4fa52aa7 SW |
736 | |
737 | #define dasd_profile_counter(value, index) \ | |
738 | { \ | |
739 | for (index = 0; index < 31 && value >> (2+index); index++) \ | |
740 | ; \ | |
741 | } | |
742 | ||
743 | static void dasd_profile_end_add_data(struct dasd_profile_info *data, | |
744 | int is_alias, | |
745 | int is_tpm, | |
746 | int is_read, | |
747 | long sectors, | |
748 | int sectors_ind, | |
749 | int tottime_ind, | |
750 | int tottimeps_ind, | |
751 | int strtime_ind, | |
752 | int irqtime_ind, | |
753 | int irqtimeps_ind, | |
754 | int endtime_ind) | |
755 | { | |
756 | /* in case of an overflow, reset the whole profile */ | |
757 | if (data->dasd_io_reqs == UINT_MAX) { | |
758 | memset(data, 0, sizeof(*data)); | |
759 | getnstimeofday(&data->starttod); | |
760 | } | |
761 | data->dasd_io_reqs++; | |
762 | data->dasd_io_sects += sectors; | |
763 | if (is_alias) | |
764 | data->dasd_io_alias++; | |
765 | if (is_tpm) | |
766 | data->dasd_io_tpm++; | |
767 | ||
768 | data->dasd_io_secs[sectors_ind]++; | |
769 | data->dasd_io_times[tottime_ind]++; | |
770 | data->dasd_io_timps[tottimeps_ind]++; | |
771 | data->dasd_io_time1[strtime_ind]++; | |
772 | data->dasd_io_time2[irqtime_ind]++; | |
773 | data->dasd_io_time2ps[irqtimeps_ind]++; | |
774 | data->dasd_io_time3[endtime_ind]++; | |
775 | ||
776 | if (is_read) { | |
777 | data->dasd_read_reqs++; | |
778 | data->dasd_read_sects += sectors; | |
779 | if (is_alias) | |
780 | data->dasd_read_alias++; | |
781 | if (is_tpm) | |
782 | data->dasd_read_tpm++; | |
783 | data->dasd_read_secs[sectors_ind]++; | |
784 | data->dasd_read_times[tottime_ind]++; | |
785 | data->dasd_read_time1[strtime_ind]++; | |
786 | data->dasd_read_time2[irqtime_ind]++; | |
787 | data->dasd_read_time3[endtime_ind]++; | |
788 | } | |
789 | } | |
790 | ||
8e09f215 SW |
791 | static void dasd_profile_end(struct dasd_block *block, |
792 | struct dasd_ccw_req *cqr, | |
793 | struct request *req) | |
1da177e4 LT |
794 | { |
795 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
796 | long tottimeps, sectors; | |
4fa52aa7 SW |
797 | struct dasd_device *device; |
798 | int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; | |
799 | int irqtime_ind, irqtimeps_ind, endtime_ind; | |
1da177e4 | 800 | |
4fa52aa7 SW |
801 | device = cqr->startdev; |
802 | if (!(dasd_global_profile_level || | |
803 | block->profile.data || | |
804 | device->profile.data)) | |
1da177e4 LT |
805 | return; |
806 | ||
83096ebf | 807 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
808 | if (!cqr->buildclk || !cqr->startclk || |
809 | !cqr->stopclk || !cqr->endclk || | |
810 | !sectors) | |
811 | return; | |
812 | ||
813 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
814 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
815 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
816 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
817 | tottimeps = tottime / sectors; | |
818 | ||
4fa52aa7 SW |
819 | dasd_profile_counter(sectors, sectors_ind); |
820 | dasd_profile_counter(tottime, tottime_ind); | |
821 | dasd_profile_counter(tottimeps, tottimeps_ind); | |
822 | dasd_profile_counter(strtime, strtime_ind); | |
823 | dasd_profile_counter(irqtime, irqtime_ind); | |
824 | dasd_profile_counter(irqtime / sectors, irqtimeps_ind); | |
825 | dasd_profile_counter(endtime, endtime_ind); | |
826 | ||
827 | if (dasd_global_profile_level) { | |
828 | dasd_profile_end_add_data(&dasd_global_profile_data, | |
829 | cqr->startdev != block->base, | |
830 | cqr->cpmode == 1, | |
831 | rq_data_dir(req) == READ, | |
832 | sectors, sectors_ind, tottime_ind, | |
833 | tottimeps_ind, strtime_ind, | |
834 | irqtime_ind, irqtimeps_ind, | |
835 | endtime_ind); | |
836 | } | |
837 | ||
838 | spin_lock(&block->profile.lock); | |
839 | if (block->profile.data) | |
840 | dasd_profile_end_add_data(block->profile.data, | |
841 | cqr->startdev != block->base, | |
842 | cqr->cpmode == 1, | |
843 | rq_data_dir(req) == READ, | |
844 | sectors, sectors_ind, tottime_ind, | |
845 | tottimeps_ind, strtime_ind, | |
846 | irqtime_ind, irqtimeps_ind, | |
847 | endtime_ind); | |
848 | spin_unlock(&block->profile.lock); | |
849 | ||
850 | spin_lock(&device->profile.lock); | |
851 | if (device->profile.data) | |
852 | dasd_profile_end_add_data(device->profile.data, | |
853 | cqr->startdev != block->base, | |
854 | cqr->cpmode == 1, | |
855 | rq_data_dir(req) == READ, | |
856 | sectors, sectors_ind, tottime_ind, | |
857 | tottimeps_ind, strtime_ind, | |
858 | irqtime_ind, irqtimeps_ind, | |
859 | endtime_ind); | |
860 | spin_unlock(&device->profile.lock); | |
861 | } | |
862 | ||
863 | void dasd_profile_reset(struct dasd_profile *profile) | |
864 | { | |
865 | struct dasd_profile_info *data; | |
866 | ||
867 | spin_lock_bh(&profile->lock); | |
868 | data = profile->data; | |
869 | if (!data) { | |
870 | spin_unlock_bh(&profile->lock); | |
871 | return; | |
872 | } | |
873 | memset(data, 0, sizeof(*data)); | |
874 | getnstimeofday(&data->starttod); | |
875 | spin_unlock_bh(&profile->lock); | |
876 | } | |
877 | ||
878 | void dasd_global_profile_reset(void) | |
879 | { | |
880 | memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data)); | |
881 | getnstimeofday(&dasd_global_profile_data.starttod); | |
882 | } | |
883 | ||
884 | int dasd_profile_on(struct dasd_profile *profile) | |
885 | { | |
886 | struct dasd_profile_info *data; | |
887 | ||
888 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
889 | if (!data) | |
890 | return -ENOMEM; | |
891 | spin_lock_bh(&profile->lock); | |
892 | if (profile->data) { | |
893 | spin_unlock_bh(&profile->lock); | |
894 | kfree(data); | |
895 | return 0; | |
896 | } | |
897 | getnstimeofday(&data->starttod); | |
898 | profile->data = data; | |
899 | spin_unlock_bh(&profile->lock); | |
900 | return 0; | |
901 | } | |
902 | ||
903 | void dasd_profile_off(struct dasd_profile *profile) | |
904 | { | |
905 | spin_lock_bh(&profile->lock); | |
906 | kfree(profile->data); | |
907 | profile->data = NULL; | |
908 | spin_unlock_bh(&profile->lock); | |
909 | } | |
910 | ||
911 | char *dasd_get_user_string(const char __user *user_buf, size_t user_len) | |
912 | { | |
913 | char *buffer; | |
914 | ||
e4258d55 | 915 | buffer = vmalloc(user_len + 1); |
4fa52aa7 SW |
916 | if (buffer == NULL) |
917 | return ERR_PTR(-ENOMEM); | |
918 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
e4258d55 | 919 | vfree(buffer); |
4fa52aa7 SW |
920 | return ERR_PTR(-EFAULT); |
921 | } | |
922 | /* got the string, now strip linefeed. */ | |
923 | if (buffer[user_len - 1] == '\n') | |
924 | buffer[user_len - 1] = 0; | |
925 | else | |
926 | buffer[user_len] = 0; | |
927 | return buffer; | |
1da177e4 | 928 | } |
4fa52aa7 SW |
929 | |
930 | static ssize_t dasd_stats_write(struct file *file, | |
931 | const char __user *user_buf, | |
932 | size_t user_len, loff_t *pos) | |
933 | { | |
934 | char *buffer, *str; | |
935 | int rc; | |
936 | struct seq_file *m = (struct seq_file *)file->private_data; | |
937 | struct dasd_profile *prof = m->private; | |
938 | ||
939 | if (user_len > 65536) | |
940 | user_len = 65536; | |
941 | buffer = dasd_get_user_string(user_buf, user_len); | |
942 | if (IS_ERR(buffer)) | |
943 | return PTR_ERR(buffer); | |
944 | ||
945 | str = skip_spaces(buffer); | |
946 | rc = user_len; | |
947 | if (strncmp(str, "reset", 5) == 0) { | |
948 | dasd_profile_reset(prof); | |
949 | } else if (strncmp(str, "on", 2) == 0) { | |
950 | rc = dasd_profile_on(prof); | |
951 | if (!rc) | |
952 | rc = user_len; | |
953 | } else if (strncmp(str, "off", 3) == 0) { | |
954 | dasd_profile_off(prof); | |
955 | } else | |
956 | rc = -EINVAL; | |
e4258d55 | 957 | vfree(buffer); |
4fa52aa7 SW |
958 | return rc; |
959 | } | |
960 | ||
961 | static void dasd_stats_array(struct seq_file *m, unsigned int *array) | |
962 | { | |
963 | int i; | |
964 | ||
965 | for (i = 0; i < 32; i++) | |
966 | seq_printf(m, "%u ", array[i]); | |
967 | seq_putc(m, '\n'); | |
968 | } | |
969 | ||
970 | static void dasd_stats_seq_print(struct seq_file *m, | |
971 | struct dasd_profile_info *data) | |
972 | { | |
973 | seq_printf(m, "start_time %ld.%09ld\n", | |
974 | data->starttod.tv_sec, data->starttod.tv_nsec); | |
975 | seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); | |
976 | seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); | |
977 | seq_printf(m, "total_pav %u\n", data->dasd_io_alias); | |
978 | seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); | |
979 | seq_printf(m, "histogram_sectors "); | |
980 | dasd_stats_array(m, data->dasd_io_secs); | |
981 | seq_printf(m, "histogram_io_times "); | |
982 | dasd_stats_array(m, data->dasd_io_times); | |
983 | seq_printf(m, "histogram_io_times_weighted "); | |
984 | dasd_stats_array(m, data->dasd_io_timps); | |
985 | seq_printf(m, "histogram_time_build_to_ssch "); | |
986 | dasd_stats_array(m, data->dasd_io_time1); | |
987 | seq_printf(m, "histogram_time_ssch_to_irq "); | |
988 | dasd_stats_array(m, data->dasd_io_time2); | |
989 | seq_printf(m, "histogram_time_ssch_to_irq_weighted "); | |
990 | dasd_stats_array(m, data->dasd_io_time2ps); | |
991 | seq_printf(m, "histogram_time_irq_to_end "); | |
992 | dasd_stats_array(m, data->dasd_io_time3); | |
993 | seq_printf(m, "histogram_ccw_queue_length "); | |
994 | dasd_stats_array(m, data->dasd_io_nr_req); | |
995 | seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); | |
996 | seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); | |
997 | seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); | |
998 | seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); | |
999 | seq_printf(m, "histogram_read_sectors "); | |
1000 | dasd_stats_array(m, data->dasd_read_secs); | |
1001 | seq_printf(m, "histogram_read_times "); | |
1002 | dasd_stats_array(m, data->dasd_read_times); | |
1003 | seq_printf(m, "histogram_read_time_build_to_ssch "); | |
1004 | dasd_stats_array(m, data->dasd_read_time1); | |
1005 | seq_printf(m, "histogram_read_time_ssch_to_irq "); | |
1006 | dasd_stats_array(m, data->dasd_read_time2); | |
1007 | seq_printf(m, "histogram_read_time_irq_to_end "); | |
1008 | dasd_stats_array(m, data->dasd_read_time3); | |
1009 | seq_printf(m, "histogram_read_ccw_queue_length "); | |
1010 | dasd_stats_array(m, data->dasd_read_nr_req); | |
1011 | } | |
1012 | ||
1013 | static int dasd_stats_show(struct seq_file *m, void *v) | |
1014 | { | |
1015 | struct dasd_profile *profile; | |
1016 | struct dasd_profile_info *data; | |
1017 | ||
1018 | profile = m->private; | |
1019 | spin_lock_bh(&profile->lock); | |
1020 | data = profile->data; | |
1021 | if (!data) { | |
1022 | spin_unlock_bh(&profile->lock); | |
1023 | seq_printf(m, "disabled\n"); | |
1024 | return 0; | |
1025 | } | |
1026 | dasd_stats_seq_print(m, data); | |
1027 | spin_unlock_bh(&profile->lock); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | static int dasd_stats_open(struct inode *inode, struct file *file) | |
1032 | { | |
1033 | struct dasd_profile *profile = inode->i_private; | |
1034 | return single_open(file, dasd_stats_show, profile); | |
1035 | } | |
1036 | ||
1037 | static const struct file_operations dasd_stats_raw_fops = { | |
1038 | .owner = THIS_MODULE, | |
1039 | .open = dasd_stats_open, | |
1040 | .read = seq_read, | |
1041 | .llseek = seq_lseek, | |
1042 | .release = single_release, | |
1043 | .write = dasd_stats_write, | |
1044 | }; | |
1045 | ||
1046 | static ssize_t dasd_stats_global_write(struct file *file, | |
1047 | const char __user *user_buf, | |
1048 | size_t user_len, loff_t *pos) | |
1049 | { | |
1050 | char *buffer, *str; | |
1051 | ssize_t rc; | |
1052 | ||
1053 | if (user_len > 65536) | |
1054 | user_len = 65536; | |
1055 | buffer = dasd_get_user_string(user_buf, user_len); | |
1056 | if (IS_ERR(buffer)) | |
1057 | return PTR_ERR(buffer); | |
1058 | str = skip_spaces(buffer); | |
1059 | rc = user_len; | |
1060 | if (strncmp(str, "reset", 5) == 0) { | |
1061 | dasd_global_profile_reset(); | |
1062 | } else if (strncmp(str, "on", 2) == 0) { | |
1063 | dasd_global_profile_reset(); | |
1064 | dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; | |
1065 | } else if (strncmp(str, "off", 3) == 0) { | |
1066 | dasd_global_profile_level = DASD_PROFILE_OFF; | |
1067 | } else | |
1068 | rc = -EINVAL; | |
e4258d55 | 1069 | vfree(buffer); |
4fa52aa7 SW |
1070 | return rc; |
1071 | } | |
1072 | ||
1073 | static int dasd_stats_global_show(struct seq_file *m, void *v) | |
1074 | { | |
1075 | if (!dasd_global_profile_level) { | |
1076 | seq_printf(m, "disabled\n"); | |
1077 | return 0; | |
1078 | } | |
1079 | dasd_stats_seq_print(m, &dasd_global_profile_data); | |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static int dasd_stats_global_open(struct inode *inode, struct file *file) | |
1084 | { | |
1085 | return single_open(file, dasd_stats_global_show, NULL); | |
1086 | } | |
1087 | ||
1088 | static const struct file_operations dasd_stats_global_fops = { | |
1089 | .owner = THIS_MODULE, | |
1090 | .open = dasd_stats_global_open, | |
1091 | .read = seq_read, | |
1092 | .llseek = seq_lseek, | |
1093 | .release = single_release, | |
1094 | .write = dasd_stats_global_write, | |
1095 | }; | |
1096 | ||
1097 | static void dasd_profile_init(struct dasd_profile *profile, | |
1098 | struct dentry *base_dentry) | |
1099 | { | |
f4ae40a6 | 1100 | umode_t mode; |
4fa52aa7 SW |
1101 | struct dentry *pde; |
1102 | ||
1103 | if (!base_dentry) | |
1104 | return; | |
1105 | profile->dentry = NULL; | |
1106 | profile->data = NULL; | |
1107 | mode = (S_IRUSR | S_IWUSR | S_IFREG); | |
1108 | pde = debugfs_create_file("statistics", mode, base_dentry, | |
1109 | profile, &dasd_stats_raw_fops); | |
1110 | if (pde && !IS_ERR(pde)) | |
1111 | profile->dentry = pde; | |
1112 | return; | |
1113 | } | |
1114 | ||
1115 | static void dasd_profile_exit(struct dasd_profile *profile) | |
1116 | { | |
1117 | dasd_profile_off(profile); | |
d7309aaa FF |
1118 | debugfs_remove(profile->dentry); |
1119 | profile->dentry = NULL; | |
4fa52aa7 SW |
1120 | } |
1121 | ||
1122 | static void dasd_statistics_removeroot(void) | |
1123 | { | |
1124 | dasd_global_profile_level = DASD_PROFILE_OFF; | |
d7309aaa FF |
1125 | debugfs_remove(dasd_global_profile_dentry); |
1126 | dasd_global_profile_dentry = NULL; | |
1127 | debugfs_remove(dasd_debugfs_global_entry); | |
1128 | debugfs_remove(dasd_debugfs_root_entry); | |
4fa52aa7 SW |
1129 | } |
1130 | ||
1131 | static void dasd_statistics_createroot(void) | |
1132 | { | |
f4ae40a6 | 1133 | umode_t mode; |
4fa52aa7 SW |
1134 | struct dentry *pde; |
1135 | ||
1136 | dasd_debugfs_root_entry = NULL; | |
1137 | dasd_debugfs_global_entry = NULL; | |
1138 | dasd_global_profile_dentry = NULL; | |
1139 | pde = debugfs_create_dir("dasd", NULL); | |
1140 | if (!pde || IS_ERR(pde)) | |
1141 | goto error; | |
1142 | dasd_debugfs_root_entry = pde; | |
1143 | pde = debugfs_create_dir("global", dasd_debugfs_root_entry); | |
1144 | if (!pde || IS_ERR(pde)) | |
1145 | goto error; | |
1146 | dasd_debugfs_global_entry = pde; | |
1147 | ||
1148 | mode = (S_IRUSR | S_IWUSR | S_IFREG); | |
1149 | pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry, | |
1150 | NULL, &dasd_stats_global_fops); | |
1151 | if (!pde || IS_ERR(pde)) | |
1152 | goto error; | |
1153 | dasd_global_profile_dentry = pde; | |
1154 | return; | |
1155 | ||
1156 | error: | |
1157 | DBF_EVENT(DBF_ERR, "%s", | |
1158 | "Creation of the dasd debugfs interface failed"); | |
1159 | dasd_statistics_removeroot(); | |
1160 | return; | |
1161 | } | |
1162 | ||
1da177e4 | 1163 | #else |
8e09f215 SW |
1164 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
1165 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
4fa52aa7 SW |
1166 | |
1167 | static void dasd_statistics_createroot(void) | |
1168 | { | |
1169 | return; | |
1170 | } | |
1171 | ||
1172 | static void dasd_statistics_removeroot(void) | |
1173 | { | |
1174 | return; | |
1175 | } | |
1176 | ||
1177 | int dasd_stats_generic_show(struct seq_file *m, void *v) | |
1178 | { | |
1179 | seq_printf(m, "Statistics are not activated in this kernel\n"); | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | static void dasd_profile_init(struct dasd_profile *profile, | |
1184 | struct dentry *base_dentry) | |
1185 | { | |
1186 | return; | |
1187 | } | |
1188 | ||
1189 | static void dasd_profile_exit(struct dasd_profile *profile) | |
1190 | { | |
1191 | return; | |
1192 | } | |
1193 | ||
1194 | int dasd_profile_on(struct dasd_profile *profile) | |
1195 | { | |
1196 | return 0; | |
1197 | } | |
1198 | ||
1da177e4 LT |
1199 | #endif /* CONFIG_DASD_PROFILE */ |
1200 | ||
1201 | /* | |
1202 | * Allocate memory for a channel program with 'cplength' channel | |
1203 | * command words and 'datasize' additional space. There are two | |
1204 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
1205 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
1206 | * that gets allocated for each device. | |
1207 | */ | |
68b781fe | 1208 | struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, |
8e09f215 SW |
1209 | int datasize, |
1210 | struct dasd_device *device) | |
1da177e4 LT |
1211 | { |
1212 | struct dasd_ccw_req *cqr; | |
1213 | ||
1214 | /* Sanity checks */ | |
68b781fe | 1215 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 1216 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 | 1217 | |
88abaab4 | 1218 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
1219 | if (cqr == NULL) |
1220 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1221 | cqr->cpaddr = NULL; |
1222 | if (cplength > 0) { | |
88abaab4 | 1223 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
1224 | GFP_ATOMIC | GFP_DMA); |
1225 | if (cqr->cpaddr == NULL) { | |
1226 | kfree(cqr); | |
1227 | return ERR_PTR(-ENOMEM); | |
1228 | } | |
1da177e4 LT |
1229 | } |
1230 | cqr->data = NULL; | |
1231 | if (datasize > 0) { | |
88abaab4 | 1232 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 1233 | if (cqr->data == NULL) { |
17fd682e | 1234 | kfree(cqr->cpaddr); |
1da177e4 LT |
1235 | kfree(cqr); |
1236 | return ERR_PTR(-ENOMEM); | |
1237 | } | |
1da177e4 | 1238 | } |
68b781fe | 1239 | cqr->magic = magic; |
1da177e4 LT |
1240 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
1241 | dasd_get_device(device); | |
1242 | return cqr; | |
1243 | } | |
7048a2b5 | 1244 | EXPORT_SYMBOL(dasd_kmalloc_request); |
1da177e4 | 1245 | |
68b781fe | 1246 | struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
8e09f215 SW |
1247 | int datasize, |
1248 | struct dasd_device *device) | |
1da177e4 LT |
1249 | { |
1250 | unsigned long flags; | |
1251 | struct dasd_ccw_req *cqr; | |
1252 | char *data; | |
1253 | int size; | |
1254 | ||
1da177e4 LT |
1255 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; |
1256 | if (cplength > 0) | |
1257 | size += cplength * sizeof(struct ccw1); | |
1258 | if (datasize > 0) | |
1259 | size += datasize; | |
1260 | spin_lock_irqsave(&device->mem_lock, flags); | |
1261 | cqr = (struct dasd_ccw_req *) | |
1262 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
1263 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
1264 | if (cqr == NULL) | |
1265 | return ERR_PTR(-ENOMEM); | |
1266 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
1267 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
1268 | cqr->cpaddr = NULL; | |
1269 | if (cplength > 0) { | |
1270 | cqr->cpaddr = (struct ccw1 *) data; | |
1271 | data += cplength*sizeof(struct ccw1); | |
1272 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
1273 | } | |
1274 | cqr->data = NULL; | |
1275 | if (datasize > 0) { | |
1276 | cqr->data = data; | |
1277 | memset(cqr->data, 0, datasize); | |
1278 | } | |
68b781fe | 1279 | cqr->magic = magic; |
1da177e4 LT |
1280 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
1281 | dasd_get_device(device); | |
1282 | return cqr; | |
1283 | } | |
7048a2b5 | 1284 | EXPORT_SYMBOL(dasd_smalloc_request); |
1da177e4 LT |
1285 | |
1286 | /* | |
1287 | * Free memory of a channel program. This function needs to free all the | |
1288 | * idal lists that might have been created by dasd_set_cda and the | |
1289 | * struct dasd_ccw_req itself. | |
1290 | */ | |
8e09f215 | 1291 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 1292 | { |
347a8dc3 | 1293 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1294 | struct ccw1 *ccw; |
1295 | ||
1296 | /* Clear any idals used for the request. */ | |
1297 | ccw = cqr->cpaddr; | |
1298 | do { | |
1299 | clear_normalized_cda(ccw); | |
1300 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
1301 | #endif | |
17fd682e JJ |
1302 | kfree(cqr->cpaddr); |
1303 | kfree(cqr->data); | |
1da177e4 LT |
1304 | kfree(cqr); |
1305 | dasd_put_device(device); | |
1306 | } | |
7048a2b5 | 1307 | EXPORT_SYMBOL(dasd_kfree_request); |
1da177e4 | 1308 | |
8e09f215 | 1309 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
1310 | { |
1311 | unsigned long flags; | |
1312 | ||
1313 | spin_lock_irqsave(&device->mem_lock, flags); | |
1314 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
1315 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
1316 | dasd_put_device(device); | |
1317 | } | |
7048a2b5 | 1318 | EXPORT_SYMBOL(dasd_sfree_request); |
1da177e4 LT |
1319 | |
1320 | /* | |
1321 | * Check discipline magic in cqr. | |
1322 | */ | |
8e09f215 | 1323 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1324 | { |
1325 | struct dasd_device *device; | |
1326 | ||
1327 | if (cqr == NULL) | |
1328 | return -EINVAL; | |
8e09f215 | 1329 | device = cqr->startdev; |
1da177e4 | 1330 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 1331 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
1332 | " dasd_ccw_req 0x%08x magic doesn't match" |
1333 | " discipline 0x%08x", | |
1334 | cqr->magic, | |
1335 | *(unsigned int *) device->discipline->name); | |
1336 | return -EINVAL; | |
1337 | } | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * Terminate the current i/o and set the request to clear_pending. | |
1343 | * Timer keeps device runnig. | |
1344 | * ccw_device_clear can fail if the i/o subsystem | |
1345 | * is in a bad mood. | |
1346 | */ | |
8e09f215 | 1347 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1348 | { |
1349 | struct dasd_device *device; | |
1350 | int retries, rc; | |
fc19f381 | 1351 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
1352 | |
1353 | /* Check the cqr */ | |
1354 | rc = dasd_check_cqr(cqr); | |
1355 | if (rc) | |
1356 | return rc; | |
1357 | retries = 0; | |
8e09f215 | 1358 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
1359 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
1360 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
1361 | switch (rc) { | |
1362 | case 0: /* termination successful */ | |
8e09f215 | 1363 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1aae0560 | 1364 | cqr->stopclk = get_tod_clock(); |
8f61701b | 1365 | cqr->starttime = 0; |
1da177e4 LT |
1366 | DBF_DEV_EVENT(DBF_DEBUG, device, |
1367 | "terminate cqr %p successful", | |
1368 | cqr); | |
1369 | break; | |
1370 | case -ENODEV: | |
1371 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1372 | "device gone, retry"); | |
1373 | break; | |
1374 | case -EIO: | |
1375 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1376 | "I/O error, retry"); | |
1377 | break; | |
1378 | case -EINVAL: | |
1379 | case -EBUSY: | |
1380 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1381 | "device busy, retry later"); | |
1382 | break; | |
1383 | default: | |
fc19f381 SH |
1384 | /* internal error 10 - unknown rc*/ |
1385 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
1386 | dev_err(&device->cdev->dev, "An error occurred in the " | |
1387 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
1388 | BUG(); |
1389 | break; | |
1390 | } | |
1391 | retries++; | |
1392 | } | |
8e09f215 | 1393 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1394 | return rc; |
1395 | } | |
7048a2b5 | 1396 | EXPORT_SYMBOL(dasd_term_IO); |
1da177e4 LT |
1397 | |
1398 | /* | |
1399 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
1400 | * In that case set up a timer to start the request later. | |
1401 | */ | |
8e09f215 | 1402 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1403 | { |
1404 | struct dasd_device *device; | |
1405 | int rc; | |
fc19f381 | 1406 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
1407 | |
1408 | /* Check the cqr */ | |
1409 | rc = dasd_check_cqr(cqr); | |
6cc7f168 SW |
1410 | if (rc) { |
1411 | cqr->intrc = rc; | |
1da177e4 | 1412 | return rc; |
6cc7f168 | 1413 | } |
8e09f215 | 1414 | device = (struct dasd_device *) cqr->startdev; |
5a27e60d SW |
1415 | if (((cqr->block && |
1416 | test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || | |
1417 | test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && | |
1418 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
1419 | DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " | |
1420 | "because of stolen lock", cqr); | |
1421 | cqr->status = DASD_CQR_ERROR; | |
1422 | cqr->intrc = -EPERM; | |
1423 | return -EPERM; | |
1424 | } | |
1da177e4 | 1425 | if (cqr->retries < 0) { |
fc19f381 SH |
1426 | /* internal error 14 - start_IO run out of retries */ |
1427 | sprintf(errorstring, "14 %p", cqr); | |
1428 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
1429 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 1430 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
1431 | return -EIO; |
1432 | } | |
1aae0560 | 1433 | cqr->startclk = get_tod_clock(); |
1da177e4 LT |
1434 | cqr->starttime = jiffies; |
1435 | cqr->retries--; | |
a4d26c6a SW |
1436 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
1437 | cqr->lpm &= device->path_data.opm; | |
1438 | if (!cqr->lpm) | |
1439 | cqr->lpm = device->path_data.opm; | |
1440 | } | |
f3eb5384 SW |
1441 | if (cqr->cpmode == 1) { |
1442 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
1443 | (long) cqr, cqr->lpm); | |
1444 | } else { | |
1445 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
1446 | (long) cqr, cqr->lpm, 0); | |
1447 | } | |
1da177e4 LT |
1448 | switch (rc) { |
1449 | case 0: | |
1450 | cqr->status = DASD_CQR_IN_IO; | |
1da177e4 LT |
1451 | break; |
1452 | case -EBUSY: | |
a4d26c6a | 1453 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
1454 | "start_IO: device busy, retry later"); |
1455 | break; | |
1456 | case -ETIMEDOUT: | |
a4d26c6a | 1457 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
1458 | "start_IO: request timeout, retry later"); |
1459 | break; | |
1460 | case -EACCES: | |
a4d26c6a SW |
1461 | /* -EACCES indicates that the request used only a subset of the |
1462 | * available paths and all these paths are gone. If the lpm of | |
1463 | * this request was only a subset of the opm (e.g. the ppm) then | |
1464 | * we just do a retry with all available paths. | |
1465 | * If we already use the full opm, something is amiss, and we | |
1466 | * need a full path verification. | |
1da177e4 | 1467 | */ |
a4d26c6a SW |
1468 | if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
1469 | DBF_DEV_EVENT(DBF_WARNING, device, | |
1470 | "start_IO: selected paths gone (%x)", | |
1471 | cqr->lpm); | |
1472 | } else if (cqr->lpm != device->path_data.opm) { | |
1473 | cqr->lpm = device->path_data.opm; | |
1474 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", | |
1475 | "start_IO: selected paths gone," | |
1476 | " retry on all paths"); | |
1477 | } else { | |
1478 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", | |
1479 | "start_IO: all paths in opm gone," | |
1480 | " do path verification"); | |
1481 | dasd_generic_last_path_gone(device); | |
1482 | device->path_data.opm = 0; | |
1483 | device->path_data.ppm = 0; | |
1484 | device->path_data.npm = 0; | |
1485 | device->path_data.tbvpm = | |
1486 | ccw_device_get_path_mask(device->cdev); | |
1487 | } | |
1da177e4 LT |
1488 | break; |
1489 | case -ENODEV: | |
a4d26c6a | 1490 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
f3eb5384 SW |
1491 | "start_IO: -ENODEV device gone, retry"); |
1492 | break; | |
1da177e4 | 1493 | case -EIO: |
a4d26c6a | 1494 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
f3eb5384 | 1495 | "start_IO: -EIO device gone, retry"); |
1da177e4 | 1496 | break; |
d41dd122 SH |
1497 | case -EINVAL: |
1498 | /* most likely caused in power management context */ | |
a4d26c6a | 1499 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
d41dd122 SH |
1500 | "start_IO: -EINVAL device currently " |
1501 | "not accessible"); | |
1502 | break; | |
1da177e4 | 1503 | default: |
fc19f381 SH |
1504 | /* internal error 11 - unknown rc */ |
1505 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
1506 | dev_err(&device->cdev->dev, | |
1507 | "An error occurred in the DASD device driver, " | |
1508 | "reason=%s\n", errorstring); | |
1da177e4 LT |
1509 | BUG(); |
1510 | break; | |
1511 | } | |
6cc7f168 | 1512 | cqr->intrc = rc; |
1da177e4 LT |
1513 | return rc; |
1514 | } | |
7048a2b5 | 1515 | EXPORT_SYMBOL(dasd_start_IO); |
1da177e4 LT |
1516 | |
1517 | /* | |
1518 | * Timeout function for dasd devices. This is used for different purposes | |
1519 | * 1) missing interrupt handler for normal operation | |
1520 | * 2) delayed start of request where start_IO failed with -EBUSY | |
1521 | * 3) timeout for missing state change interrupts | |
1522 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
1523 | * DASD_CQR_QUEUED for 2) and 3). | |
1524 | */ | |
8e09f215 | 1525 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
1526 | { |
1527 | unsigned long flags; | |
1528 | struct dasd_device *device; | |
1529 | ||
1530 | device = (struct dasd_device *) ptr; | |
1531 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1532 | /* re-activate request queue */ | |
eb6e199b | 1533 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
1da177e4 | 1534 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
8e09f215 | 1535 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | /* | |
1539 | * Setup timeout for a device in jiffies. | |
1540 | */ | |
8e09f215 | 1541 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 1542 | { |
48cae885 SW |
1543 | if (expires == 0) |
1544 | del_timer(&device->timer); | |
1545 | else | |
1546 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 | 1547 | } |
7048a2b5 | 1548 | EXPORT_SYMBOL(dasd_device_set_timer); |
1da177e4 LT |
1549 | |
1550 | /* | |
1551 | * Clear timeout for a device. | |
1552 | */ | |
8e09f215 | 1553 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 1554 | { |
48cae885 | 1555 | del_timer(&device->timer); |
1da177e4 | 1556 | } |
7048a2b5 | 1557 | EXPORT_SYMBOL(dasd_device_clear_timer); |
1da177e4 | 1558 | |
8e09f215 SW |
1559 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
1560 | unsigned long intparm) | |
1da177e4 LT |
1561 | { |
1562 | struct dasd_ccw_req *cqr; | |
1563 | struct dasd_device *device; | |
1564 | ||
f16f5843 SW |
1565 | if (!intparm) |
1566 | return; | |
1da177e4 LT |
1567 | cqr = (struct dasd_ccw_req *) intparm; |
1568 | if (cqr->status != DASD_CQR_IN_IO) { | |
b8ed5dd5 SH |
1569 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, |
1570 | "invalid status in handle_killed_request: " | |
1571 | "%02x", cqr->status); | |
1da177e4 LT |
1572 | return; |
1573 | } | |
1574 | ||
589c74d5 SH |
1575 | device = dasd_device_from_cdev_locked(cdev); |
1576 | if (IS_ERR(device)) { | |
1577 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", | |
1578 | "unable to get device from cdev"); | |
1579 | return; | |
1580 | } | |
1581 | ||
1582 | if (!cqr->startdev || | |
1583 | device != cqr->startdev || | |
1584 | strncmp(cqr->startdev->discipline->ebcname, | |
1585 | (char *) &cqr->magic, 4)) { | |
294001a8 SH |
1586 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1587 | "invalid device in request"); | |
589c74d5 | 1588 | dasd_put_device(device); |
1da177e4 LT |
1589 | return; |
1590 | } | |
1591 | ||
1592 | /* Schedule request to be retried. */ | |
1593 | cqr->status = DASD_CQR_QUEUED; | |
1594 | ||
8e09f215 SW |
1595 | dasd_device_clear_timer(device); |
1596 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1597 | dasd_put_device(device); |
1598 | } | |
1599 | ||
8e09f215 | 1600 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 1601 | { |
20c64468 SW |
1602 | /* First of all start sense subsystem status request. */ |
1603 | dasd_eer_snss(device); | |
1604 | ||
eb6e199b | 1605 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
8e09f215 SW |
1606 | dasd_schedule_device_bh(device); |
1607 | if (device->block) | |
1608 | dasd_schedule_block_bh(device->block); | |
1da177e4 | 1609 | } |
7048a2b5 | 1610 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
1da177e4 LT |
1611 | |
1612 | /* | |
1613 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1614 | */ | |
8e09f215 SW |
1615 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1616 | struct irb *irb) | |
1da177e4 LT |
1617 | { |
1618 | struct dasd_ccw_req *cqr, *next; | |
1619 | struct dasd_device *device; | |
1620 | unsigned long long now; | |
1621 | int expires; | |
1da177e4 LT |
1622 | |
1623 | if (IS_ERR(irb)) { | |
1624 | switch (PTR_ERR(irb)) { | |
1625 | case -EIO: | |
1da177e4 LT |
1626 | break; |
1627 | case -ETIMEDOUT: | |
b8ed5dd5 SH |
1628 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1629 | "request timed out\n", __func__); | |
1da177e4 LT |
1630 | break; |
1631 | default: | |
b8ed5dd5 SH |
1632 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1633 | "unknown error %ld\n", __func__, | |
1634 | PTR_ERR(irb)); | |
1da177e4 | 1635 | } |
f16f5843 | 1636 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1637 | return; |
1638 | } | |
1639 | ||
1aae0560 | 1640 | now = get_tod_clock(); |
8e09f215 | 1641 | cqr = (struct dasd_ccw_req *) intparm; |
5a27e60d SW |
1642 | /* check for conditions that should be handled immediately */ |
1643 | if (!cqr || | |
1644 | !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
1645 | scsw_cstat(&irb->scsw) == 0)) { | |
a5a0061f SW |
1646 | if (cqr) |
1647 | memcpy(&cqr->irb, irb, sizeof(*irb)); | |
a00bfd71 | 1648 | device = dasd_device_from_cdev_locked(cdev); |
56b86b61 SH |
1649 | if (IS_ERR(device)) |
1650 | return; | |
1651 | /* ignore unsolicited interrupts for DIAG discipline */ | |
1652 | if (device->discipline == dasd_diag_discipline_pointer) { | |
1da177e4 | 1653 | dasd_put_device(device); |
56b86b61 | 1654 | return; |
1da177e4 | 1655 | } |
5a27e60d SW |
1656 | device->discipline->dump_sense_dbf(device, irb, "int"); |
1657 | if (device->features & DASD_FEATURE_ERPLOG) | |
1658 | device->discipline->dump_sense(device, cqr, irb); | |
1659 | device->discipline->check_for_device_change(device, cqr, irb); | |
56b86b61 | 1660 | dasd_put_device(device); |
1da177e4 | 1661 | } |
5a27e60d SW |
1662 | if (!cqr) |
1663 | return; | |
1da177e4 | 1664 | |
8e09f215 SW |
1665 | device = (struct dasd_device *) cqr->startdev; |
1666 | if (!device || | |
1da177e4 | 1667 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
294001a8 SH |
1668 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1669 | "invalid device in request"); | |
1da177e4 LT |
1670 | return; |
1671 | } | |
1672 | ||
1673 | /* Check for clear pending */ | |
8e09f215 | 1674 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1675 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1676 | cqr->status = DASD_CQR_CLEARED; |
1677 | dasd_device_clear_timer(device); | |
8f61701b | 1678 | wake_up(&dasd_flush_wq); |
8e09f215 | 1679 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1680 | return; |
1681 | } | |
1682 | ||
f3eb5384 | 1683 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1684 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1685 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1686 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1687 | return; |
1688 | } | |
fc19f381 | 1689 | |
8e09f215 | 1690 | next = NULL; |
1da177e4 | 1691 | expires = 0; |
f3eb5384 SW |
1692 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1693 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1694 | /* request was completed successfully */ |
1695 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1696 | cqr->stopclk = now; |
1697 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1698 | if (cqr->devlist.next != &device->ccw_queue) { |
1699 | next = list_entry(cqr->devlist.next, | |
1700 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1701 | } |
8e09f215 | 1702 | } else { /* error */ |
6c5f57c7 SH |
1703 | /* |
1704 | * If we don't want complex ERP for this request, then just | |
1705 | * reset this and retry it in the fastpath | |
8e09f215 | 1706 | */ |
6c5f57c7 | 1707 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1708 | cqr->retries > 0) { |
a4d26c6a | 1709 | if (cqr->lpm == device->path_data.opm) |
fc19f381 SH |
1710 | DBF_DEV_EVENT(DBF_DEBUG, device, |
1711 | "default ERP in fastpath " | |
1712 | "(%i retries left)", | |
1713 | cqr->retries); | |
a4d26c6a SW |
1714 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) |
1715 | cqr->lpm = device->path_data.opm; | |
8e09f215 SW |
1716 | cqr->status = DASD_CQR_QUEUED; |
1717 | next = cqr; | |
1718 | } else | |
1da177e4 | 1719 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1720 | } |
1721 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1722 | (!device->stopped)) { | |
1723 | if (device->discipline->start_IO(next) == 0) | |
1724 | expires = next->expires; | |
1da177e4 LT |
1725 | } |
1726 | if (expires != 0) | |
8e09f215 | 1727 | dasd_device_set_timer(device, expires); |
1da177e4 | 1728 | else |
8e09f215 SW |
1729 | dasd_device_clear_timer(device); |
1730 | dasd_schedule_device_bh(device); | |
1da177e4 | 1731 | } |
7048a2b5 | 1732 | EXPORT_SYMBOL(dasd_int_handler); |
1da177e4 | 1733 | |
a23ed009 SH |
1734 | enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) |
1735 | { | |
1736 | struct dasd_device *device; | |
1737 | ||
1738 | device = dasd_device_from_cdev_locked(cdev); | |
1739 | ||
1740 | if (IS_ERR(device)) | |
1741 | goto out; | |
1742 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || | |
1743 | device->state != device->target || | |
5a27e60d | 1744 | !device->discipline->check_for_device_change){ |
a23ed009 SH |
1745 | dasd_put_device(device); |
1746 | goto out; | |
1747 | } | |
5a27e60d SW |
1748 | if (device->discipline->dump_sense_dbf) |
1749 | device->discipline->dump_sense_dbf(device, irb, "uc"); | |
1750 | device->discipline->check_for_device_change(device, NULL, irb); | |
a23ed009 SH |
1751 | dasd_put_device(device); |
1752 | out: | |
1753 | return UC_TODO_RETRY; | |
1754 | } | |
1755 | EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); | |
1756 | ||
1da177e4 | 1757 | /* |
8e09f215 SW |
1758 | * If we have an error on a dasd_block layer request then we cancel |
1759 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1760 | */ |
8e09f215 SW |
1761 | static void __dasd_device_recovery(struct dasd_device *device, |
1762 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1763 | { |
8e09f215 SW |
1764 | struct list_head *l, *n; |
1765 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1766 | |
8e09f215 SW |
1767 | /* |
1768 | * only requeue request that came from the dasd_block layer | |
1769 | */ | |
1770 | if (!ref_cqr->block) | |
1771 | return; | |
1da177e4 | 1772 | |
8e09f215 SW |
1773 | list_for_each_safe(l, n, &device->ccw_queue) { |
1774 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1775 | if (cqr->status == DASD_CQR_QUEUED && | |
1776 | ref_cqr->block == cqr->block) { | |
1777 | cqr->status = DASD_CQR_CLEARED; | |
1778 | } | |
1779 | } | |
1780 | }; | |
1da177e4 LT |
1781 | |
1782 | /* | |
8e09f215 SW |
1783 | * Remove those ccw requests from the queue that need to be returned |
1784 | * to the upper layer. | |
1da177e4 | 1785 | */ |
8e09f215 SW |
1786 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1787 | struct list_head *final_queue) | |
1da177e4 LT |
1788 | { |
1789 | struct list_head *l, *n; | |
1790 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1791 | |
1da177e4 LT |
1792 | /* Process request with final status. */ |
1793 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1794 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1795 | ||
1fbdb8be | 1796 | /* Skip any non-final request. */ |
8e09f215 SW |
1797 | if (cqr->status == DASD_CQR_QUEUED || |
1798 | cqr->status == DASD_CQR_IN_IO || | |
1799 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1fbdb8be | 1800 | continue; |
1da177e4 | 1801 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1802 | __dasd_device_recovery(device, cqr); |
20c64468 | 1803 | } |
1da177e4 | 1804 | /* Rechain finished requests to final queue */ |
8e09f215 | 1805 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1806 | } |
1807 | } | |
1808 | ||
1da177e4 | 1809 | /* |
8e09f215 SW |
1810 | * the cqrs from the final queue are returned to the upper layer |
1811 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1812 | */ |
8e09f215 SW |
1813 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1814 | struct list_head *final_queue) | |
1da177e4 | 1815 | { |
8e09f215 | 1816 | struct list_head *l, *n; |
1da177e4 | 1817 | struct dasd_ccw_req *cqr; |
03513bcc | 1818 | struct dasd_block *block; |
c80ee724 SH |
1819 | void (*callback)(struct dasd_ccw_req *, void *data); |
1820 | void *callback_data; | |
fc19f381 | 1821 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1822 | |
8e09f215 SW |
1823 | list_for_each_safe(l, n, final_queue) { |
1824 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1825 | list_del_init(&cqr->devlist); | |
03513bcc | 1826 | block = cqr->block; |
c80ee724 SH |
1827 | callback = cqr->callback; |
1828 | callback_data = cqr->callback_data; | |
03513bcc SW |
1829 | if (block) |
1830 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1831 | switch (cqr->status) { |
1832 | case DASD_CQR_SUCCESS: | |
1833 | cqr->status = DASD_CQR_DONE; | |
1834 | break; | |
1835 | case DASD_CQR_ERROR: | |
1836 | cqr->status = DASD_CQR_NEED_ERP; | |
1837 | break; | |
1838 | case DASD_CQR_CLEARED: | |
1839 | cqr->status = DASD_CQR_TERMINATED; | |
1840 | break; | |
1841 | default: | |
fc19f381 SH |
1842 | /* internal error 12 - wrong cqr status*/ |
1843 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1844 | dev_err(&device->cdev->dev, | |
1845 | "An error occurred in the DASD device driver, " | |
1846 | "reason=%s\n", errorstring); | |
8e09f215 | 1847 | BUG(); |
1da177e4 | 1848 | } |
8e09f215 | 1849 | if (cqr->callback != NULL) |
c80ee724 | 1850 | (callback)(cqr, callback_data); |
03513bcc SW |
1851 | if (block) |
1852 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1853 | } |
1854 | } | |
1855 | ||
1856 | /* | |
1857 | * Take a look at the first request on the ccw queue and check | |
1858 | * if it reached its expire time. If so, terminate the IO. | |
1859 | */ | |
8e09f215 | 1860 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1861 | { |
1862 | struct dasd_ccw_req *cqr; | |
1863 | ||
1864 | if (list_empty(&device->ccw_queue)) | |
1865 | return; | |
8e09f215 | 1866 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1867 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1868 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
d07dc5d8 SH |
1869 | if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { |
1870 | /* | |
1871 | * IO in safe offline processing should not | |
1872 | * run out of retries | |
1873 | */ | |
1874 | cqr->retries++; | |
1875 | } | |
29145a6c HH |
1876 | if (device->discipline->term_IO(cqr) != 0) { |
1877 | /* Hmpf, try again in 5 sec */ | |
fc19f381 | 1878 | dev_err(&device->cdev->dev, |
625c94df | 1879 | "cqr %p timed out (%lus) but cannot be " |
fc19f381 SH |
1880 | "ended, retrying in 5 s\n", |
1881 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1882 | cqr->expires += 5*HZ; |
1883 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1884 | } else { |
fc19f381 | 1885 | dev_err(&device->cdev->dev, |
625c94df | 1886 | "cqr %p timed out (%lus), %i retries " |
fc19f381 SH |
1887 | "remaining\n", cqr, (cqr->expires/HZ), |
1888 | cqr->retries); | |
1da177e4 LT |
1889 | } |
1890 | } | |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * Take a look at the first request on the ccw queue and check | |
1895 | * if it needs to be started. | |
1896 | */ | |
8e09f215 | 1897 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1898 | { |
1899 | struct dasd_ccw_req *cqr; | |
1900 | int rc; | |
1901 | ||
1902 | if (list_empty(&device->ccw_queue)) | |
1903 | return; | |
8e09f215 | 1904 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1905 | if (cqr->status != DASD_CQR_QUEUED) |
1906 | return; | |
a4d26c6a SW |
1907 | /* when device is stopped, return request to previous layer |
1908 | * exception: only the disconnect or unresumed bits are set and the | |
1909 | * cqr is a path verification request | |
1910 | */ | |
1911 | if (device->stopped && | |
1912 | !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) | |
1913 | && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) { | |
1914 | cqr->intrc = -EAGAIN; | |
8e09f215 SW |
1915 | cqr->status = DASD_CQR_CLEARED; |
1916 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1917 | return; |
1c01b8a5 | 1918 | } |
25ee4cf8 PO |
1919 | |
1920 | rc = device->discipline->start_IO(cqr); | |
1921 | if (rc == 0) | |
8e09f215 | 1922 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1923 | else if (rc == -EACCES) { |
8e09f215 | 1924 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1925 | } else |
1926 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1927 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1928 | } |
1929 | ||
a4d26c6a SW |
1930 | static void __dasd_device_check_path_events(struct dasd_device *device) |
1931 | { | |
1932 | int rc; | |
1933 | ||
1934 | if (device->path_data.tbvpm) { | |
1935 | if (device->stopped & ~(DASD_STOPPED_DC_WAIT | | |
1936 | DASD_UNRESUMED_PM)) | |
1937 | return; | |
1938 | rc = device->discipline->verify_path( | |
1939 | device, device->path_data.tbvpm); | |
1940 | if (rc) | |
1941 | dasd_device_set_timer(device, 50); | |
1942 | else | |
1943 | device->path_data.tbvpm = 0; | |
1944 | } | |
1945 | }; | |
1946 | ||
1da177e4 | 1947 | /* |
8e09f215 SW |
1948 | * Go through all request on the dasd_device request queue, |
1949 | * terminate them on the cdev if necessary, and return them to the | |
1950 | * submitting layer via callback. | |
1951 | * Note: | |
1952 | * Make sure that all 'submitting layers' still exist when | |
1953 | * this function is called!. In other words, when 'device' is a base | |
1954 | * device then all block layer requests must have been removed before | |
1955 | * via dasd_flush_block_queue. | |
1da177e4 | 1956 | */ |
8e09f215 | 1957 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1958 | { |
8e09f215 SW |
1959 | struct dasd_ccw_req *cqr, *n; |
1960 | int rc; | |
1da177e4 | 1961 | struct list_head flush_queue; |
1da177e4 LT |
1962 | |
1963 | INIT_LIST_HEAD(&flush_queue); | |
1964 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1965 | rc = 0; |
8e09f215 | 1966 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1967 | /* Check status and move request to flush_queue */ |
1968 | switch (cqr->status) { | |
1969 | case DASD_CQR_IN_IO: | |
1970 | rc = device->discipline->term_IO(cqr); | |
1971 | if (rc) { | |
1972 | /* unable to terminate requeust */ | |
fc19f381 SH |
1973 | dev_err(&device->cdev->dev, |
1974 | "Flushing the DASD request queue " | |
1975 | "failed for request %p\n", cqr); | |
8f61701b HH |
1976 | /* stop flush processing */ |
1977 | goto finished; | |
1978 | } | |
1979 | break; | |
1980 | case DASD_CQR_QUEUED: | |
1aae0560 | 1981 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 1982 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1983 | break; |
8e09f215 | 1984 | default: /* no need to modify the others */ |
8f61701b HH |
1985 | break; |
1986 | } | |
8e09f215 | 1987 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1988 | } |
8f61701b HH |
1989 | finished: |
1990 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1991 | /* |
1992 | * After this point all requests must be in state CLEAR_PENDING, | |
1993 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1994 | * one of the others. | |
1995 | */ | |
1996 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1997 | wait_event(dasd_flush_wq, | |
1998 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1999 | /* | |
2000 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
2001 | * and call the callback function of flushed requests | |
2002 | */ | |
2003 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 2004 | return rc; |
1da177e4 | 2005 | } |
7048a2b5 | 2006 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); |
1da177e4 LT |
2007 | |
2008 | /* | |
2009 | * Acquire the device lock and process queues for the device. | |
2010 | */ | |
8e09f215 | 2011 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
2012 | { |
2013 | struct list_head final_queue; | |
1da177e4 LT |
2014 | |
2015 | atomic_set (&device->tasklet_scheduled, 0); | |
2016 | INIT_LIST_HEAD(&final_queue); | |
2017 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
2018 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
2019 | __dasd_device_check_expire(device); |
2020 | /* find final requests on ccw queue */ | |
2021 | __dasd_device_process_ccw_queue(device, &final_queue); | |
a4d26c6a | 2022 | __dasd_device_check_path_events(device); |
1da177e4 LT |
2023 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2024 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
2025 | __dasd_device_process_final_queue(device, &final_queue); |
2026 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 2027 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2028 | __dasd_device_start_head(device); |
2029 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
4679e893 SH |
2030 | if (waitqueue_active(&shutdown_waitq)) |
2031 | wake_up(&shutdown_waitq); | |
1da177e4 LT |
2032 | dasd_put_device(device); |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * Schedules a call to dasd_tasklet over the device tasklet. | |
2037 | */ | |
8e09f215 | 2038 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
2039 | { |
2040 | /* Protect against rescheduling. */ | |
973bd993 | 2041 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
2042 | return; |
2043 | dasd_get_device(device); | |
2044 | tasklet_hi_schedule(&device->tasklet); | |
2045 | } | |
7048a2b5 | 2046 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
1da177e4 | 2047 | |
eb6e199b SW |
2048 | void dasd_device_set_stop_bits(struct dasd_device *device, int bits) |
2049 | { | |
2050 | device->stopped |= bits; | |
2051 | } | |
2052 | EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); | |
2053 | ||
2054 | void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) | |
2055 | { | |
2056 | device->stopped &= ~bits; | |
2057 | if (!device->stopped) | |
2058 | wake_up(&generic_waitq); | |
2059 | } | |
2060 | EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); | |
2061 | ||
1da177e4 | 2062 | /* |
8e09f215 SW |
2063 | * Queue a request to the head of the device ccw_queue. |
2064 | * Start the I/O if possible. | |
1da177e4 | 2065 | */ |
8e09f215 | 2066 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2067 | { |
2068 | struct dasd_device *device; | |
2069 | unsigned long flags; | |
2070 | ||
8e09f215 | 2071 | device = cqr->startdev; |
1da177e4 | 2072 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
2073 | cqr->status = DASD_CQR_QUEUED; |
2074 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 2075 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2076 | dasd_schedule_device_bh(device); |
1da177e4 LT |
2077 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
2078 | } | |
7048a2b5 | 2079 | EXPORT_SYMBOL(dasd_add_request_head); |
1da177e4 LT |
2080 | |
2081 | /* | |
8e09f215 SW |
2082 | * Queue a request to the tail of the device ccw_queue. |
2083 | * Start the I/O if possible. | |
1da177e4 | 2084 | */ |
8e09f215 | 2085 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2086 | { |
2087 | struct dasd_device *device; | |
2088 | unsigned long flags; | |
2089 | ||
8e09f215 | 2090 | device = cqr->startdev; |
1da177e4 | 2091 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
2092 | cqr->status = DASD_CQR_QUEUED; |
2093 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 2094 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2095 | dasd_schedule_device_bh(device); |
1da177e4 LT |
2096 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
2097 | } | |
7048a2b5 | 2098 | EXPORT_SYMBOL(dasd_add_request_tail); |
1da177e4 LT |
2099 | |
2100 | /* | |
8e09f215 | 2101 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 2102 | */ |
5915a873 | 2103 | void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 | 2104 | { |
1c1e093c SW |
2105 | spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); |
2106 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
2107 | spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); | |
2108 | wake_up(&generic_waitq); | |
1da177e4 | 2109 | } |
5915a873 | 2110 | EXPORT_SYMBOL_GPL(dasd_wakeup_cb); |
1da177e4 | 2111 | |
8e09f215 | 2112 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2113 | { |
2114 | struct dasd_device *device; | |
2115 | int rc; | |
2116 | ||
8e09f215 | 2117 | device = cqr->startdev; |
1da177e4 | 2118 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1c1e093c | 2119 | rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); |
1da177e4 LT |
2120 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2121 | return rc; | |
2122 | } | |
2123 | ||
2124 | /* | |
eb6e199b | 2125 | * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. |
1da177e4 | 2126 | */ |
eb6e199b | 2127 | static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) |
1da177e4 | 2128 | { |
1da177e4 | 2129 | struct dasd_device *device; |
eb6e199b | 2130 | dasd_erp_fn_t erp_fn; |
138c014d | 2131 | |
eb6e199b SW |
2132 | if (cqr->status == DASD_CQR_FILLED) |
2133 | return 0; | |
8e09f215 | 2134 | device = cqr->startdev; |
eb6e199b SW |
2135 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
2136 | if (cqr->status == DASD_CQR_TERMINATED) { | |
2137 | device->discipline->handle_terminated_request(cqr); | |
2138 | return 1; | |
2139 | } | |
2140 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
2141 | erp_fn = device->discipline->erp_action(cqr); | |
2142 | erp_fn(cqr); | |
2143 | return 1; | |
2144 | } | |
2145 | if (cqr->status == DASD_CQR_FAILED) | |
2146 | dasd_log_sense(cqr, &cqr->irb); | |
2147 | if (cqr->refers) { | |
2148 | __dasd_process_erp(device, cqr); | |
2149 | return 1; | |
2150 | } | |
2151 | } | |
2152 | return 0; | |
2153 | } | |
138c014d | 2154 | |
eb6e199b SW |
2155 | static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) |
2156 | { | |
2157 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { | |
2158 | if (cqr->refers) /* erp is not done yet */ | |
2159 | return 1; | |
2160 | return ((cqr->status != DASD_CQR_DONE) && | |
2161 | (cqr->status != DASD_CQR_FAILED)); | |
2162 | } else | |
2163 | return (cqr->status == DASD_CQR_FILLED); | |
2164 | } | |
138c014d | 2165 | |
eb6e199b SW |
2166 | static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) |
2167 | { | |
2168 | struct dasd_device *device; | |
2169 | int rc; | |
2170 | struct list_head ccw_queue; | |
2171 | struct dasd_ccw_req *cqr; | |
2172 | ||
2173 | INIT_LIST_HEAD(&ccw_queue); | |
2174 | maincqr->status = DASD_CQR_FILLED; | |
2175 | device = maincqr->startdev; | |
2176 | list_add(&maincqr->blocklist, &ccw_queue); | |
2177 | for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); | |
2178 | cqr = list_first_entry(&ccw_queue, | |
2179 | struct dasd_ccw_req, blocklist)) { | |
2180 | ||
2181 | if (__dasd_sleep_on_erp(cqr)) | |
2182 | continue; | |
2183 | if (cqr->status != DASD_CQR_FILLED) /* could be failed */ | |
2184 | continue; | |
5a27e60d SW |
2185 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
2186 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2187 | cqr->status = DASD_CQR_FAILED; | |
2188 | cqr->intrc = -EPERM; | |
2189 | continue; | |
2190 | } | |
eb6e199b SW |
2191 | /* Non-temporary stop condition will trigger fail fast */ |
2192 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
2193 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2194 | (!dasd_eer_enabled(device))) { | |
2195 | cqr->status = DASD_CQR_FAILED; | |
d1ffc1f8 | 2196 | cqr->intrc = -ENOLINK; |
eb6e199b SW |
2197 | continue; |
2198 | } | |
eb6e199b SW |
2199 | /* Don't try to start requests if device is stopped */ |
2200 | if (interruptible) { | |
2201 | rc = wait_event_interruptible( | |
2202 | generic_waitq, !(device->stopped)); | |
2203 | if (rc == -ERESTARTSYS) { | |
2204 | cqr->status = DASD_CQR_FAILED; | |
2205 | maincqr->intrc = rc; | |
2206 | continue; | |
2207 | } | |
2208 | } else | |
2209 | wait_event(generic_waitq, !(device->stopped)); | |
2210 | ||
5915a873 SH |
2211 | if (!cqr->callback) |
2212 | cqr->callback = dasd_wakeup_cb; | |
2213 | ||
1c1e093c | 2214 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
eb6e199b SW |
2215 | dasd_add_request_tail(cqr); |
2216 | if (interruptible) { | |
2217 | rc = wait_event_interruptible( | |
2218 | generic_waitq, _wait_for_wakeup(cqr)); | |
2219 | if (rc == -ERESTARTSYS) { | |
2220 | dasd_cancel_req(cqr); | |
2221 | /* wait (non-interruptible) for final status */ | |
2222 | wait_event(generic_waitq, | |
2223 | _wait_for_wakeup(cqr)); | |
2224 | cqr->status = DASD_CQR_FAILED; | |
2225 | maincqr->intrc = rc; | |
2226 | continue; | |
2227 | } | |
2228 | } else | |
2229 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); | |
2230 | } | |
2231 | ||
1aae0560 | 2232 | maincqr->endclk = get_tod_clock(); |
eb6e199b SW |
2233 | if ((maincqr->status != DASD_CQR_DONE) && |
2234 | (maincqr->intrc != -ERESTARTSYS)) | |
2235 | dasd_log_sense(maincqr, &maincqr->irb); | |
2236 | if (maincqr->status == DASD_CQR_DONE) | |
6cc7f168 | 2237 | rc = 0; |
eb6e199b SW |
2238 | else if (maincqr->intrc) |
2239 | rc = maincqr->intrc; | |
6cc7f168 SW |
2240 | else |
2241 | rc = -EIO; | |
1da177e4 LT |
2242 | return rc; |
2243 | } | |
2244 | ||
d42e1712 SH |
2245 | static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue) |
2246 | { | |
2247 | struct dasd_ccw_req *cqr; | |
2248 | ||
2249 | list_for_each_entry(cqr, ccw_queue, blocklist) { | |
2250 | if (cqr->callback_data != DASD_SLEEPON_END_TAG) | |
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | return 1; | |
2255 | } | |
2256 | ||
2257 | static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible) | |
2258 | { | |
2259 | struct dasd_device *device; | |
2260 | int rc; | |
2261 | struct dasd_ccw_req *cqr, *n; | |
2262 | ||
2263 | retry: | |
2264 | list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { | |
2265 | device = cqr->startdev; | |
2266 | if (cqr->status != DASD_CQR_FILLED) /*could be failed*/ | |
2267 | continue; | |
2268 | ||
2269 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && | |
2270 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2271 | cqr->status = DASD_CQR_FAILED; | |
2272 | cqr->intrc = -EPERM; | |
2273 | continue; | |
2274 | } | |
2275 | /*Non-temporary stop condition will trigger fail fast*/ | |
2276 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
2277 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2278 | !dasd_eer_enabled(device)) { | |
2279 | cqr->status = DASD_CQR_FAILED; | |
2280 | cqr->intrc = -EAGAIN; | |
2281 | continue; | |
2282 | } | |
2283 | ||
2284 | /*Don't try to start requests if device is stopped*/ | |
2285 | if (interruptible) { | |
2286 | rc = wait_event_interruptible( | |
2287 | generic_waitq, !device->stopped); | |
2288 | if (rc == -ERESTARTSYS) { | |
2289 | cqr->status = DASD_CQR_FAILED; | |
2290 | cqr->intrc = rc; | |
2291 | continue; | |
2292 | } | |
2293 | } else | |
2294 | wait_event(generic_waitq, !(device->stopped)); | |
2295 | ||
2296 | if (!cqr->callback) | |
2297 | cqr->callback = dasd_wakeup_cb; | |
2298 | cqr->callback_data = DASD_SLEEPON_START_TAG; | |
2299 | dasd_add_request_tail(cqr); | |
2300 | } | |
2301 | ||
2302 | wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue)); | |
2303 | ||
2304 | rc = 0; | |
2305 | list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { | |
2306 | if (__dasd_sleep_on_erp(cqr)) | |
2307 | rc = 1; | |
2308 | } | |
2309 | if (rc) | |
2310 | goto retry; | |
2311 | ||
2312 | ||
2313 | return 0; | |
2314 | } | |
2315 | ||
eb6e199b SW |
2316 | /* |
2317 | * Queue a request to the tail of the device ccw_queue and wait for | |
2318 | * it's completion. | |
2319 | */ | |
2320 | int dasd_sleep_on(struct dasd_ccw_req *cqr) | |
2321 | { | |
2322 | return _dasd_sleep_on(cqr, 0); | |
2323 | } | |
7048a2b5 | 2324 | EXPORT_SYMBOL(dasd_sleep_on); |
eb6e199b | 2325 | |
d42e1712 SH |
2326 | /* |
2327 | * Start requests from a ccw_queue and wait for their completion. | |
2328 | */ | |
2329 | int dasd_sleep_on_queue(struct list_head *ccw_queue) | |
2330 | { | |
2331 | return _dasd_sleep_on_queue(ccw_queue, 0); | |
2332 | } | |
2333 | EXPORT_SYMBOL(dasd_sleep_on_queue); | |
2334 | ||
1da177e4 | 2335 | /* |
8e09f215 SW |
2336 | * Queue a request to the tail of the device ccw_queue and wait |
2337 | * interruptible for it's completion. | |
1da177e4 | 2338 | */ |
8e09f215 | 2339 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 2340 | { |
eb6e199b | 2341 | return _dasd_sleep_on(cqr, 1); |
1da177e4 | 2342 | } |
7048a2b5 | 2343 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); |
1da177e4 LT |
2344 | |
2345 | /* | |
2346 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
2347 | * for eckd devices) the currently running request has to be terminated | |
2348 | * and be put back to status queued, before the special request is added | |
2349 | * to the head of the queue. Then the special request is waited on normally. | |
2350 | */ | |
8e09f215 | 2351 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
2352 | { |
2353 | struct dasd_ccw_req *cqr; | |
aade6c0d | 2354 | int rc; |
1da177e4 LT |
2355 | |
2356 | if (list_empty(&device->ccw_queue)) | |
2357 | return 0; | |
8e09f215 | 2358 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
aade6c0d SH |
2359 | rc = device->discipline->term_IO(cqr); |
2360 | if (!rc) | |
2361 | /* | |
2362 | * CQR terminated because a more important request is pending. | |
2363 | * Undo decreasing of retry counter because this is | |
2364 | * not an error case. | |
2365 | */ | |
2366 | cqr->retries++; | |
2367 | return rc; | |
1da177e4 LT |
2368 | } |
2369 | ||
8e09f215 | 2370 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 2371 | { |
1da177e4 LT |
2372 | struct dasd_device *device; |
2373 | int rc; | |
138c014d | 2374 | |
8e09f215 | 2375 | device = cqr->startdev; |
5a27e60d SW |
2376 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
2377 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2378 | cqr->status = DASD_CQR_FAILED; | |
2379 | cqr->intrc = -EPERM; | |
2380 | return -EIO; | |
2381 | } | |
1da177e4 LT |
2382 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
2383 | rc = _dasd_term_running_cqr(device); | |
2384 | if (rc) { | |
2385 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
2386 | return rc; | |
2387 | } | |
1da177e4 | 2388 | cqr->callback = dasd_wakeup_cb; |
1c1e093c | 2389 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
1da177e4 | 2390 | cqr->status = DASD_CQR_QUEUED; |
214b8ffc SH |
2391 | /* |
2392 | * add new request as second | |
2393 | * first the terminated cqr needs to be finished | |
2394 | */ | |
2395 | list_add(&cqr->devlist, device->ccw_queue.next); | |
138c014d | 2396 | |
1da177e4 | 2397 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2398 | dasd_schedule_device_bh(device); |
138c014d | 2399 | |
1da177e4 LT |
2400 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2401 | ||
c80ee724 | 2402 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 2403 | |
6cc7f168 SW |
2404 | if (cqr->status == DASD_CQR_DONE) |
2405 | rc = 0; | |
2406 | else if (cqr->intrc) | |
2407 | rc = cqr->intrc; | |
2408 | else | |
2409 | rc = -EIO; | |
0e003b70 SH |
2410 | |
2411 | /* kick tasklets */ | |
2412 | dasd_schedule_device_bh(device); | |
2413 | if (device->block) | |
2414 | dasd_schedule_block_bh(device->block); | |
2415 | ||
1da177e4 LT |
2416 | return rc; |
2417 | } | |
7048a2b5 | 2418 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); |
1da177e4 LT |
2419 | |
2420 | /* | |
2421 | * Cancels a request that was started with dasd_sleep_on_req. | |
2422 | * This is useful to timeout requests. The request will be | |
2423 | * terminated if it is currently in i/o. | |
b99a946d | 2424 | * Returns 0 if request termination was successful |
8e09f215 SW |
2425 | * negative error code if termination failed |
2426 | * Cancellation of a request is an asynchronous operation! The calling | |
2427 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 2428 | */ |
8e09f215 | 2429 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 2430 | { |
8e09f215 | 2431 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
2432 | unsigned long flags; |
2433 | int rc; | |
2434 | ||
2435 | rc = 0; | |
2436 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
2437 | switch (cqr->status) { | |
2438 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
2439 | /* request was not started - just set to cleared */ |
2440 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
2441 | break; |
2442 | case DASD_CQR_IN_IO: | |
2443 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
2444 | rc = device->discipline->term_IO(cqr); |
2445 | if (rc) { | |
fc19f381 SH |
2446 | dev_err(&device->cdev->dev, |
2447 | "Cancelling request %p failed with rc=%d\n", | |
2448 | cqr, rc); | |
8e09f215 | 2449 | } else { |
1aae0560 | 2450 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 2451 | } |
1da177e4 | 2452 | break; |
8e09f215 | 2453 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 2454 | break; |
8e09f215 SW |
2455 | } |
2456 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
2457 | dasd_schedule_device_bh(device); | |
2458 | return rc; | |
2459 | } | |
7048a2b5 | 2460 | EXPORT_SYMBOL(dasd_cancel_req); |
8e09f215 | 2461 | |
8e09f215 SW |
2462 | /* |
2463 | * SECTION: Operations of the dasd_block layer. | |
2464 | */ | |
2465 | ||
2466 | /* | |
2467 | * Timeout function for dasd_block. This is used when the block layer | |
2468 | * is waiting for something that may not come reliably, (e.g. a state | |
2469 | * change interrupt) | |
2470 | */ | |
2471 | static void dasd_block_timeout(unsigned long ptr) | |
2472 | { | |
2473 | unsigned long flags; | |
2474 | struct dasd_block *block; | |
2475 | ||
2476 | block = (struct dasd_block *) ptr; | |
2477 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
2478 | /* re-activate request queue */ | |
eb6e199b | 2479 | dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); |
8e09f215 SW |
2480 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
2481 | dasd_schedule_block_bh(block); | |
2482 | } | |
2483 | ||
2484 | /* | |
2485 | * Setup timeout for a dasd_block in jiffies. | |
2486 | */ | |
2487 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
2488 | { | |
48cae885 SW |
2489 | if (expires == 0) |
2490 | del_timer(&block->timer); | |
2491 | else | |
2492 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 | 2493 | } |
7048a2b5 | 2494 | EXPORT_SYMBOL(dasd_block_set_timer); |
8e09f215 SW |
2495 | |
2496 | /* | |
2497 | * Clear timeout for a dasd_block. | |
2498 | */ | |
2499 | void dasd_block_clear_timer(struct dasd_block *block) | |
2500 | { | |
48cae885 | 2501 | del_timer(&block->timer); |
8e09f215 | 2502 | } |
7048a2b5 | 2503 | EXPORT_SYMBOL(dasd_block_clear_timer); |
8e09f215 | 2504 | |
8e09f215 SW |
2505 | /* |
2506 | * Process finished error recovery ccw. | |
2507 | */ | |
eb6e199b SW |
2508 | static void __dasd_process_erp(struct dasd_device *device, |
2509 | struct dasd_ccw_req *cqr) | |
8e09f215 SW |
2510 | { |
2511 | dasd_erp_fn_t erp_fn; | |
8e09f215 SW |
2512 | |
2513 | if (cqr->status == DASD_CQR_DONE) | |
2514 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
2515 | else | |
fc19f381 | 2516 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
2517 | erp_fn = device->discipline->erp_postaction(cqr); |
2518 | erp_fn(cqr); | |
2519 | } | |
1da177e4 | 2520 | |
8e09f215 SW |
2521 | /* |
2522 | * Fetch requests from the block device queue. | |
2523 | */ | |
2524 | static void __dasd_process_request_queue(struct dasd_block *block) | |
2525 | { | |
2526 | struct request_queue *queue; | |
2527 | struct request *req; | |
2528 | struct dasd_ccw_req *cqr; | |
2529 | struct dasd_device *basedev; | |
2530 | unsigned long flags; | |
2531 | queue = block->request_queue; | |
2532 | basedev = block->base; | |
2533 | /* No queue ? Then there is nothing to do. */ | |
2534 | if (queue == NULL) | |
2535 | return; | |
2536 | ||
2537 | /* | |
2538 | * We requeue request from the block device queue to the ccw | |
2539 | * queue only in two states. In state DASD_STATE_READY the | |
2540 | * partition detection is done and we need to requeue requests | |
2541 | * for that. State DASD_STATE_ONLINE is normal block device | |
2542 | * operation. | |
2543 | */ | |
97f604b0 SW |
2544 | if (basedev->state < DASD_STATE_READY) { |
2545 | while ((req = blk_fetch_request(block->request_queue))) | |
2546 | __blk_end_request_all(req, -EIO); | |
8e09f215 | 2547 | return; |
97f604b0 | 2548 | } |
8e09f215 | 2549 | /* Now we try to fetch requests from the request queue */ |
7eaceacc | 2550 | while ((req = blk_peek_request(queue))) { |
8e09f215 SW |
2551 | if (basedev->features & DASD_FEATURE_READONLY && |
2552 | rq_data_dir(req) == WRITE) { | |
2553 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
2554 | "Rejecting write request %p", | |
2555 | req); | |
9934c8c0 | 2556 | blk_start_request(req); |
40cbbb78 | 2557 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
2558 | continue; |
2559 | } | |
5ea34a01 HR |
2560 | if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) && |
2561 | (basedev->features & DASD_FEATURE_FAILFAST || | |
2562 | blk_noretry_request(req))) { | |
2563 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
2564 | "Rejecting failfast request %p", | |
2565 | req); | |
2566 | blk_start_request(req); | |
2567 | __blk_end_request_all(req, -ETIMEDOUT); | |
2568 | continue; | |
2569 | } | |
8e09f215 SW |
2570 | cqr = basedev->discipline->build_cp(basedev, block, req); |
2571 | if (IS_ERR(cqr)) { | |
2572 | if (PTR_ERR(cqr) == -EBUSY) | |
2573 | break; /* normal end condition */ | |
2574 | if (PTR_ERR(cqr) == -ENOMEM) | |
2575 | break; /* terminate request queue loop */ | |
2576 | if (PTR_ERR(cqr) == -EAGAIN) { | |
2577 | /* | |
2578 | * The current request cannot be build right | |
2579 | * now, we have to try later. If this request | |
2580 | * is the head-of-queue we stop the device | |
2581 | * for 1/2 second. | |
2582 | */ | |
2583 | if (!list_empty(&block->ccw_queue)) | |
2584 | break; | |
eb6e199b SW |
2585 | spin_lock_irqsave( |
2586 | get_ccwdev_lock(basedev->cdev), flags); | |
2587 | dasd_device_set_stop_bits(basedev, | |
2588 | DASD_STOPPED_PENDING); | |
2589 | spin_unlock_irqrestore( | |
2590 | get_ccwdev_lock(basedev->cdev), flags); | |
8e09f215 SW |
2591 | dasd_block_set_timer(block, HZ/2); |
2592 | break; | |
2593 | } | |
2594 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
2595 | "CCW creation failed (rc=%ld) " | |
2596 | "on request %p", | |
2597 | PTR_ERR(cqr), req); | |
9934c8c0 | 2598 | blk_start_request(req); |
40cbbb78 | 2599 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
2600 | continue; |
2601 | } | |
2602 | /* | |
2603 | * Note: callback is set to dasd_return_cqr_cb in | |
2604 | * __dasd_block_start_head to cover erp requests as well | |
2605 | */ | |
2606 | cqr->callback_data = (void *) req; | |
2607 | cqr->status = DASD_CQR_FILLED; | |
a2ace466 | 2608 | req->completion_data = cqr; |
9934c8c0 | 2609 | blk_start_request(req); |
8e09f215 | 2610 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
a2ace466 | 2611 | INIT_LIST_HEAD(&cqr->devlist); |
8e09f215 SW |
2612 | dasd_profile_start(block, cqr, req); |
2613 | } | |
2614 | } | |
2615 | ||
2616 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
2617 | { | |
2618 | struct request *req; | |
2619 | int status; | |
4c4e2148 | 2620 | int error = 0; |
8e09f215 SW |
2621 | |
2622 | req = (struct request *) cqr->callback_data; | |
2623 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 2624 | status = cqr->block->base->discipline->free_cp(cqr, req); |
d1ffc1f8 HR |
2625 | if (status < 0) |
2626 | error = status; | |
2627 | else if (status == 0) { | |
2628 | if (cqr->intrc == -EPERM) | |
2629 | error = -EBADE; | |
2630 | else if (cqr->intrc == -ENOLINK || | |
2631 | cqr->intrc == -ETIMEDOUT) | |
2632 | error = cqr->intrc; | |
2633 | else | |
2634 | error = -EIO; | |
2635 | } | |
40cbbb78 | 2636 | __blk_end_request_all(req, error); |
8e09f215 SW |
2637 | } |
2638 | ||
2639 | /* | |
2640 | * Process ccw request queue. | |
2641 | */ | |
2642 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
2643 | struct list_head *final_queue) | |
2644 | { | |
2645 | struct list_head *l, *n; | |
2646 | struct dasd_ccw_req *cqr; | |
2647 | dasd_erp_fn_t erp_fn; | |
2648 | unsigned long flags; | |
2649 | struct dasd_device *base = block->base; | |
2650 | ||
2651 | restart: | |
2652 | /* Process request with final status. */ | |
2653 | list_for_each_safe(l, n, &block->ccw_queue) { | |
2654 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2655 | if (cqr->status != DASD_CQR_DONE && | |
2656 | cqr->status != DASD_CQR_FAILED && | |
2657 | cqr->status != DASD_CQR_NEED_ERP && | |
2658 | cqr->status != DASD_CQR_TERMINATED) | |
2659 | continue; | |
2660 | ||
2661 | if (cqr->status == DASD_CQR_TERMINATED) { | |
2662 | base->discipline->handle_terminated_request(cqr); | |
2663 | goto restart; | |
2664 | } | |
2665 | ||
2666 | /* Process requests that may be recovered */ | |
2667 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 | 2668 | erp_fn = base->discipline->erp_action(cqr); |
6a5176c4 SH |
2669 | if (IS_ERR(erp_fn(cqr))) |
2670 | continue; | |
8e09f215 SW |
2671 | goto restart; |
2672 | } | |
2673 | ||
a9cffb22 SH |
2674 | /* log sense for fatal error */ |
2675 | if (cqr->status == DASD_CQR_FAILED) { | |
2676 | dasd_log_sense(cqr, &cqr->irb); | |
2677 | } | |
2678 | ||
8e09f215 SW |
2679 | /* First of all call extended error reporting. */ |
2680 | if (dasd_eer_enabled(base) && | |
2681 | cqr->status == DASD_CQR_FAILED) { | |
2682 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
2683 | ||
2684 | /* restart request */ | |
2685 | cqr->status = DASD_CQR_FILLED; | |
2686 | cqr->retries = 255; | |
2687 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
eb6e199b | 2688 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 SW |
2689 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
2690 | flags); | |
2691 | goto restart; | |
2692 | } | |
2693 | ||
2694 | /* Process finished ERP request. */ | |
2695 | if (cqr->refers) { | |
eb6e199b | 2696 | __dasd_process_erp(base, cqr); |
8e09f215 SW |
2697 | goto restart; |
2698 | } | |
2699 | ||
2700 | /* Rechain finished requests to final queue */ | |
1aae0560 | 2701 | cqr->endclk = get_tod_clock(); |
8e09f215 SW |
2702 | list_move_tail(&cqr->blocklist, final_queue); |
2703 | } | |
2704 | } | |
2705 | ||
2706 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
2707 | { | |
2708 | dasd_schedule_block_bh(cqr->block); | |
2709 | } | |
2710 | ||
2711 | static void __dasd_block_start_head(struct dasd_block *block) | |
2712 | { | |
2713 | struct dasd_ccw_req *cqr; | |
2714 | ||
2715 | if (list_empty(&block->ccw_queue)) | |
2716 | return; | |
2717 | /* We allways begin with the first requests on the queue, as some | |
2718 | * of previously started requests have to be enqueued on a | |
2719 | * dasd_device again for error recovery. | |
2720 | */ | |
2721 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
2722 | if (cqr->status != DASD_CQR_FILLED) | |
2723 | continue; | |
5a27e60d SW |
2724 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && |
2725 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2726 | cqr->status = DASD_CQR_FAILED; | |
2727 | cqr->intrc = -EPERM; | |
2728 | dasd_schedule_block_bh(block); | |
2729 | continue; | |
2730 | } | |
8e09f215 SW |
2731 | /* Non-temporary stop condition will trigger fail fast */ |
2732 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
2733 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2734 | (!dasd_eer_enabled(block->base))) { | |
2735 | cqr->status = DASD_CQR_FAILED; | |
d1ffc1f8 | 2736 | cqr->intrc = -ENOLINK; |
8e09f215 SW |
2737 | dasd_schedule_block_bh(block); |
2738 | continue; | |
2739 | } | |
2740 | /* Don't try to start requests if device is stopped */ | |
2741 | if (block->base->stopped) | |
2742 | return; | |
2743 | ||
2744 | /* just a fail safe check, should not happen */ | |
2745 | if (!cqr->startdev) | |
2746 | cqr->startdev = block->base; | |
2747 | ||
2748 | /* make sure that the requests we submit find their way back */ | |
2749 | cqr->callback = dasd_return_cqr_cb; | |
2750 | ||
2751 | dasd_add_request_tail(cqr); | |
2752 | } | |
2753 | } | |
2754 | ||
2755 | /* | |
2756 | * Central dasd_block layer routine. Takes requests from the generic | |
2757 | * block layer request queue, creates ccw requests, enqueues them on | |
2758 | * a dasd_device and processes ccw requests that have been returned. | |
2759 | */ | |
2760 | static void dasd_block_tasklet(struct dasd_block *block) | |
2761 | { | |
2762 | struct list_head final_queue; | |
2763 | struct list_head *l, *n; | |
2764 | struct dasd_ccw_req *cqr; | |
2765 | ||
2766 | atomic_set(&block->tasklet_scheduled, 0); | |
2767 | INIT_LIST_HEAD(&final_queue); | |
2768 | spin_lock(&block->queue_lock); | |
2769 | /* Finish off requests on ccw queue */ | |
2770 | __dasd_process_block_ccw_queue(block, &final_queue); | |
2771 | spin_unlock(&block->queue_lock); | |
2772 | /* Now call the callback function of requests with final status */ | |
2773 | spin_lock_irq(&block->request_queue_lock); | |
2774 | list_for_each_safe(l, n, &final_queue) { | |
2775 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2776 | list_del_init(&cqr->blocklist); | |
2777 | __dasd_cleanup_cqr(cqr); | |
2778 | } | |
2779 | spin_lock(&block->queue_lock); | |
2780 | /* Get new request from the block device request queue */ | |
2781 | __dasd_process_request_queue(block); | |
2782 | /* Now check if the head of the ccw queue needs to be started. */ | |
2783 | __dasd_block_start_head(block); | |
2784 | spin_unlock(&block->queue_lock); | |
2785 | spin_unlock_irq(&block->request_queue_lock); | |
4679e893 SH |
2786 | if (waitqueue_active(&shutdown_waitq)) |
2787 | wake_up(&shutdown_waitq); | |
8e09f215 SW |
2788 | dasd_put_device(block->base); |
2789 | } | |
2790 | ||
2791 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
2792 | { | |
2793 | wake_up(&dasd_flush_wq); | |
2794 | } | |
2795 | ||
c5576876 SH |
2796 | /* |
2797 | * Requeue a request back to the block request queue | |
2798 | * only works for block requests | |
2799 | */ | |
2800 | static int _dasd_requeue_request(struct dasd_ccw_req *cqr) | |
2801 | { | |
2802 | struct dasd_block *block = cqr->block; | |
2803 | struct request *req; | |
2804 | unsigned long flags; | |
2805 | ||
2806 | if (!block) | |
2807 | return -EINVAL; | |
2808 | spin_lock_irqsave(&block->queue_lock, flags); | |
2809 | req = (struct request *) cqr->callback_data; | |
2810 | blk_requeue_request(block->request_queue, req); | |
2811 | spin_unlock_irqrestore(&block->queue_lock, flags); | |
2812 | ||
2813 | return 0; | |
2814 | } | |
2815 | ||
8e09f215 SW |
2816 | /* |
2817 | * Go through all request on the dasd_block request queue, cancel them | |
2818 | * on the respective dasd_device, and return them to the generic | |
2819 | * block layer. | |
2820 | */ | |
2821 | static int dasd_flush_block_queue(struct dasd_block *block) | |
2822 | { | |
2823 | struct dasd_ccw_req *cqr, *n; | |
2824 | int rc, i; | |
2825 | struct list_head flush_queue; | |
2826 | ||
2827 | INIT_LIST_HEAD(&flush_queue); | |
2828 | spin_lock_bh(&block->queue_lock); | |
2829 | rc = 0; | |
2830 | restart: | |
2831 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
2832 | /* if this request currently owned by a dasd_device cancel it */ | |
2833 | if (cqr->status >= DASD_CQR_QUEUED) | |
2834 | rc = dasd_cancel_req(cqr); | |
2835 | if (rc < 0) | |
2836 | break; | |
2837 | /* Rechain request (including erp chain) so it won't be | |
2838 | * touched by the dasd_block_tasklet anymore. | |
2839 | * Replace the callback so we notice when the request | |
2840 | * is returned from the dasd_device layer. | |
2841 | */ | |
2842 | cqr->callback = _dasd_wake_block_flush_cb; | |
2843 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
2844 | list_move_tail(&cqr->blocklist, &flush_queue); | |
2845 | if (i > 1) | |
2846 | /* moved more than one request - need to restart */ | |
2847 | goto restart; | |
2848 | } | |
2849 | spin_unlock_bh(&block->queue_lock); | |
2850 | /* Now call the callback function of flushed requests */ | |
2851 | restart_cb: | |
2852 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
2853 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
2854 | /* Process finished ERP request. */ | |
2855 | if (cqr->refers) { | |
0cd4bd47 | 2856 | spin_lock_bh(&block->queue_lock); |
eb6e199b | 2857 | __dasd_process_erp(block->base, cqr); |
0cd4bd47 | 2858 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
2859 | /* restart list_for_xx loop since dasd_process_erp |
2860 | * might remove multiple elements */ | |
2861 | goto restart_cb; | |
2862 | } | |
2863 | /* call the callback function */ | |
0cd4bd47 | 2864 | spin_lock_irq(&block->request_queue_lock); |
1aae0560 | 2865 | cqr->endclk = get_tod_clock(); |
8e09f215 SW |
2866 | list_del_init(&cqr->blocklist); |
2867 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 2868 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 2869 | } |
1da177e4 LT |
2870 | return rc; |
2871 | } | |
2872 | ||
2873 | /* | |
8e09f215 SW |
2874 | * Schedules a call to dasd_tasklet over the device tasklet. |
2875 | */ | |
2876 | void dasd_schedule_block_bh(struct dasd_block *block) | |
2877 | { | |
2878 | /* Protect against rescheduling. */ | |
2879 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
2880 | return; | |
2881 | /* life cycle of block is bound to it's base device */ | |
2882 | dasd_get_device(block->base); | |
2883 | tasklet_hi_schedule(&block->tasklet); | |
2884 | } | |
7048a2b5 | 2885 | EXPORT_SYMBOL(dasd_schedule_block_bh); |
8e09f215 SW |
2886 | |
2887 | ||
2888 | /* | |
2889 | * SECTION: external block device operations | |
2890 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
2891 | */ |
2892 | ||
2893 | /* | |
2894 | * Dasd request queue function. Called from ll_rw_blk.c | |
2895 | */ | |
8e09f215 | 2896 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 2897 | { |
8e09f215 | 2898 | struct dasd_block *block; |
1da177e4 | 2899 | |
8e09f215 SW |
2900 | block = queue->queuedata; |
2901 | spin_lock(&block->queue_lock); | |
1da177e4 | 2902 | /* Get new request from the block device request queue */ |
8e09f215 | 2903 | __dasd_process_request_queue(block); |
1da177e4 | 2904 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2905 | __dasd_block_start_head(block); |
2906 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
2907 | } |
2908 | ||
a2ace466 HR |
2909 | /* |
2910 | * Block timeout callback, called from the block layer | |
2911 | * | |
2912 | * request_queue lock is held on entry. | |
2913 | * | |
2914 | * Return values: | |
2915 | * BLK_EH_RESET_TIMER if the request should be left running | |
2916 | * BLK_EH_NOT_HANDLED if the request is handled or terminated | |
2917 | * by the driver. | |
2918 | */ | |
2919 | enum blk_eh_timer_return dasd_times_out(struct request *req) | |
2920 | { | |
2921 | struct dasd_ccw_req *cqr = req->completion_data; | |
2922 | struct dasd_block *block = req->q->queuedata; | |
2923 | struct dasd_device *device; | |
2924 | int rc = 0; | |
2925 | ||
2926 | if (!cqr) | |
2927 | return BLK_EH_NOT_HANDLED; | |
2928 | ||
2929 | device = cqr->startdev ? cqr->startdev : block->base; | |
3d71ad32 HR |
2930 | if (!device->blk_timeout) |
2931 | return BLK_EH_RESET_TIMER; | |
a2ace466 HR |
2932 | DBF_DEV_EVENT(DBF_WARNING, device, |
2933 | " dasd_times_out cqr %p status %x", | |
2934 | cqr, cqr->status); | |
2935 | ||
2936 | spin_lock(&block->queue_lock); | |
2937 | spin_lock(get_ccwdev_lock(device->cdev)); | |
2938 | cqr->retries = -1; | |
2939 | cqr->intrc = -ETIMEDOUT; | |
2940 | if (cqr->status >= DASD_CQR_QUEUED) { | |
2941 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
2942 | rc = dasd_cancel_req(cqr); | |
2943 | } else if (cqr->status == DASD_CQR_FILLED || | |
2944 | cqr->status == DASD_CQR_NEED_ERP) { | |
2945 | cqr->status = DASD_CQR_TERMINATED; | |
2946 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
2947 | } else if (cqr->status == DASD_CQR_IN_ERP) { | |
2948 | struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr; | |
2949 | ||
2950 | list_for_each_entry_safe(searchcqr, nextcqr, | |
2951 | &block->ccw_queue, blocklist) { | |
2952 | tmpcqr = searchcqr; | |
2953 | while (tmpcqr->refers) | |
2954 | tmpcqr = tmpcqr->refers; | |
2955 | if (tmpcqr != cqr) | |
2956 | continue; | |
2957 | /* searchcqr is an ERP request for cqr */ | |
2958 | searchcqr->retries = -1; | |
2959 | searchcqr->intrc = -ETIMEDOUT; | |
2960 | if (searchcqr->status >= DASD_CQR_QUEUED) { | |
2961 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
2962 | rc = dasd_cancel_req(searchcqr); | |
2963 | spin_lock(get_ccwdev_lock(device->cdev)); | |
2964 | } else if ((searchcqr->status == DASD_CQR_FILLED) || | |
2965 | (searchcqr->status == DASD_CQR_NEED_ERP)) { | |
2966 | searchcqr->status = DASD_CQR_TERMINATED; | |
2967 | rc = 0; | |
2968 | } else if (searchcqr->status == DASD_CQR_IN_ERP) { | |
2969 | /* | |
2970 | * Shouldn't happen; most recent ERP | |
2971 | * request is at the front of queue | |
2972 | */ | |
2973 | continue; | |
2974 | } | |
2975 | break; | |
2976 | } | |
2977 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
2978 | } | |
2979 | dasd_schedule_block_bh(block); | |
2980 | spin_unlock(&block->queue_lock); | |
2981 | ||
2982 | return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED; | |
2983 | } | |
2984 | ||
1da177e4 LT |
2985 | /* |
2986 | * Allocate and initialize request queue and default I/O scheduler. | |
2987 | */ | |
8e09f215 | 2988 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
2989 | { |
2990 | int rc; | |
2991 | ||
8e09f215 SW |
2992 | block->request_queue = blk_init_queue(do_dasd_request, |
2993 | &block->request_queue_lock); | |
2994 | if (block->request_queue == NULL) | |
1da177e4 LT |
2995 | return -ENOMEM; |
2996 | ||
8e09f215 | 2997 | block->request_queue->queuedata = block; |
1da177e4 | 2998 | |
8e09f215 | 2999 | elevator_exit(block->request_queue->elevator); |
08a8a0c5 | 3000 | block->request_queue->elevator = NULL; |
ef089941 | 3001 | mutex_lock(&block->request_queue->sysfs_lock); |
8e09f215 | 3002 | rc = elevator_init(block->request_queue, "deadline"); |
ef089941 | 3003 | if (rc) |
8e09f215 | 3004 | blk_cleanup_queue(block->request_queue); |
ef089941 HC |
3005 | mutex_unlock(&block->request_queue->sysfs_lock); |
3006 | return rc; | |
1da177e4 LT |
3007 | } |
3008 | ||
3009 | /* | |
3010 | * Allocate and initialize request queue. | |
3011 | */ | |
8e09f215 | 3012 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
3013 | { |
3014 | int max; | |
3015 | ||
e4dbb0f2 SH |
3016 | if (block->base->features & DASD_FEATURE_USERAW) { |
3017 | /* | |
3018 | * the max_blocks value for raw_track access is 256 | |
3019 | * it is higher than the native ECKD value because we | |
3020 | * only need one ccw per track | |
3021 | * so the max_hw_sectors are | |
3022 | * 2048 x 512B = 1024kB = 16 tracks | |
3023 | */ | |
3024 | max = 2048; | |
3025 | } else { | |
3026 | max = block->base->discipline->max_blocks << block->s2b_shift; | |
3027 | } | |
3028 | blk_queue_logical_block_size(block->request_queue, | |
3029 | block->bp_block); | |
086fa5ff | 3030 | blk_queue_max_hw_sectors(block->request_queue, max); |
8a78362c | 3031 | blk_queue_max_segments(block->request_queue, -1L); |
f3eb5384 SW |
3032 | /* with page sized segments we can translate each segement into |
3033 | * one idaw/tidaw | |
3034 | */ | |
3035 | blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); | |
3036 | blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); | |
1da177e4 LT |
3037 | } |
3038 | ||
3039 | /* | |
3040 | * Deactivate and free request queue. | |
3041 | */ | |
8e09f215 | 3042 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 3043 | { |
8e09f215 SW |
3044 | if (block->request_queue) { |
3045 | blk_cleanup_queue(block->request_queue); | |
3046 | block->request_queue = NULL; | |
1da177e4 LT |
3047 | } |
3048 | } | |
3049 | ||
3050 | /* | |
3051 | * Flush request on the request queue. | |
3052 | */ | |
8e09f215 | 3053 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
3054 | { |
3055 | struct request *req; | |
3056 | ||
8e09f215 | 3057 | if (!block->request_queue) |
1da177e4 | 3058 | return; |
138c014d | 3059 | |
8e09f215 | 3060 | spin_lock_irq(&block->request_queue_lock); |
9934c8c0 | 3061 | while ((req = blk_fetch_request(block->request_queue))) |
40cbbb78 | 3062 | __blk_end_request_all(req, -EIO); |
8e09f215 | 3063 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
3064 | } |
3065 | ||
57a7c0bc | 3066 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 3067 | { |
9eb25122 | 3068 | struct dasd_device *base; |
1da177e4 LT |
3069 | int rc; |
3070 | ||
65f8da47 SW |
3071 | base = dasd_device_from_gendisk(bdev->bd_disk); |
3072 | if (!base) | |
9eb25122 SH |
3073 | return -ENODEV; |
3074 | ||
65f8da47 | 3075 | atomic_inc(&base->block->open_count); |
8e09f215 | 3076 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { |
1da177e4 LT |
3077 | rc = -ENODEV; |
3078 | goto unlock; | |
3079 | } | |
3080 | ||
8e09f215 | 3081 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
3082 | rc = -EINVAL; |
3083 | goto unlock; | |
3084 | } | |
3085 | ||
3086 | if (dasd_probeonly) { | |
fc19f381 SH |
3087 | dev_info(&base->cdev->dev, |
3088 | "Accessing the DASD failed because it is in " | |
3089 | "probeonly mode\n"); | |
1da177e4 LT |
3090 | rc = -EPERM; |
3091 | goto out; | |
3092 | } | |
3093 | ||
8e09f215 SW |
3094 | if (base->state <= DASD_STATE_BASIC) { |
3095 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
3096 | " Cannot open unrecognized device"); |
3097 | rc = -ENODEV; | |
3098 | goto out; | |
3099 | } | |
3100 | ||
33b62a30 SW |
3101 | if ((mode & FMODE_WRITE) && |
3102 | (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || | |
3103 | (base->features & DASD_FEATURE_READONLY))) { | |
3104 | rc = -EROFS; | |
3105 | goto out; | |
3106 | } | |
3107 | ||
65f8da47 | 3108 | dasd_put_device(base); |
1da177e4 LT |
3109 | return 0; |
3110 | ||
3111 | out: | |
8e09f215 | 3112 | module_put(base->discipline->owner); |
1da177e4 | 3113 | unlock: |
65f8da47 SW |
3114 | atomic_dec(&base->block->open_count); |
3115 | dasd_put_device(base); | |
1da177e4 LT |
3116 | return rc; |
3117 | } | |
3118 | ||
db2a144b | 3119 | static void dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 3120 | { |
db2a144b AV |
3121 | struct dasd_device *base = dasd_device_from_gendisk(disk); |
3122 | if (base) { | |
3123 | atomic_dec(&base->block->open_count); | |
3124 | module_put(base->discipline->owner); | |
3125 | dasd_put_device(base); | |
3126 | } | |
1da177e4 LT |
3127 | } |
3128 | ||
a885c8c4 CH |
3129 | /* |
3130 | * Return disk geometry. | |
3131 | */ | |
8e09f215 | 3132 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 3133 | { |
8e09f215 | 3134 | struct dasd_device *base; |
a885c8c4 | 3135 | |
65f8da47 SW |
3136 | base = dasd_device_from_gendisk(bdev->bd_disk); |
3137 | if (!base) | |
a885c8c4 CH |
3138 | return -ENODEV; |
3139 | ||
8e09f215 | 3140 | if (!base->discipline || |
65f8da47 SW |
3141 | !base->discipline->fill_geometry) { |
3142 | dasd_put_device(base); | |
a885c8c4 | 3143 | return -EINVAL; |
65f8da47 SW |
3144 | } |
3145 | base->discipline->fill_geometry(base->block, geo); | |
3146 | geo->start = get_start_sect(bdev) >> base->block->s2b_shift; | |
3147 | dasd_put_device(base); | |
a885c8c4 CH |
3148 | return 0; |
3149 | } | |
3150 | ||
83d5cde4 | 3151 | const struct block_device_operations |
1da177e4 LT |
3152 | dasd_device_operations = { |
3153 | .owner = THIS_MODULE, | |
57a7c0bc AV |
3154 | .open = dasd_open, |
3155 | .release = dasd_release, | |
0000d031 HC |
3156 | .ioctl = dasd_ioctl, |
3157 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 3158 | .getgeo = dasd_getgeo, |
1da177e4 LT |
3159 | }; |
3160 | ||
8e09f215 SW |
3161 | /******************************************************************************* |
3162 | * end of block device operations | |
3163 | */ | |
1da177e4 LT |
3164 | |
3165 | static void | |
3166 | dasd_exit(void) | |
3167 | { | |
3168 | #ifdef CONFIG_PROC_FS | |
3169 | dasd_proc_exit(); | |
3170 | #endif | |
20c64468 | 3171 | dasd_eer_exit(); |
6bb0e010 HH |
3172 | if (dasd_page_cache != NULL) { |
3173 | kmem_cache_destroy(dasd_page_cache); | |
3174 | dasd_page_cache = NULL; | |
3175 | } | |
1da177e4 LT |
3176 | dasd_gendisk_exit(); |
3177 | dasd_devmap_exit(); | |
1da177e4 LT |
3178 | if (dasd_debug_area != NULL) { |
3179 | debug_unregister(dasd_debug_area); | |
3180 | dasd_debug_area = NULL; | |
3181 | } | |
4fa52aa7 | 3182 | dasd_statistics_removeroot(); |
1da177e4 LT |
3183 | } |
3184 | ||
3185 | /* | |
3186 | * SECTION: common functions for ccw_driver use | |
3187 | */ | |
3188 | ||
33b62a30 SW |
3189 | /* |
3190 | * Is the device read-only? | |
3191 | * Note that this function does not report the setting of the | |
3192 | * readonly device attribute, but how it is configured in z/VM. | |
3193 | */ | |
3194 | int dasd_device_is_ro(struct dasd_device *device) | |
3195 | { | |
3196 | struct ccw_dev_id dev_id; | |
3197 | struct diag210 diag_data; | |
3198 | int rc; | |
3199 | ||
3200 | if (!MACHINE_IS_VM) | |
3201 | return 0; | |
3202 | ccw_device_get_id(device->cdev, &dev_id); | |
3203 | memset(&diag_data, 0, sizeof(diag_data)); | |
3204 | diag_data.vrdcdvno = dev_id.devno; | |
3205 | diag_data.vrdclen = sizeof(diag_data); | |
3206 | rc = diag210(&diag_data); | |
3207 | if (rc == 0 || rc == 2) { | |
3208 | return diag_data.vrdcvfla & 0x80; | |
3209 | } else { | |
3210 | DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", | |
3211 | dev_id.devno, rc); | |
3212 | return 0; | |
3213 | } | |
3214 | } | |
3215 | EXPORT_SYMBOL_GPL(dasd_device_is_ro); | |
3216 | ||
f3445a1a CH |
3217 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
3218 | { | |
3219 | struct ccw_device *cdev = data; | |
3220 | int ret; | |
3221 | ||
3222 | ret = ccw_device_set_online(cdev); | |
3223 | if (ret) | |
3224 | pr_warning("%s: Setting the DASD online failed with rc=%d\n", | |
3225 | dev_name(&cdev->dev), ret); | |
f3445a1a CH |
3226 | } |
3227 | ||
1c01b8a5 HH |
3228 | /* |
3229 | * Initial attempt at a probe function. this can be simplified once | |
3230 | * the other detection code is gone. | |
3231 | */ | |
8e09f215 SW |
3232 | int dasd_generic_probe(struct ccw_device *cdev, |
3233 | struct dasd_discipline *discipline) | |
1da177e4 LT |
3234 | { |
3235 | int ret; | |
3236 | ||
3237 | ret = dasd_add_sysfs_files(cdev); | |
3238 | if (ret) { | |
b8ed5dd5 SH |
3239 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", |
3240 | "dasd_generic_probe: could not add " | |
3241 | "sysfs entries"); | |
40545573 | 3242 | return ret; |
1da177e4 | 3243 | } |
40545573 | 3244 | cdev->handler = &dasd_int_handler; |
1da177e4 | 3245 | |
40545573 HH |
3246 | /* |
3247 | * Automatically online either all dasd devices (dasd_autodetect) | |
3248 | * or all devices specified with dasd= parameters during | |
3249 | * initial probe. | |
3250 | */ | |
3251 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 3252 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 3253 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 3254 | return 0; |
1da177e4 | 3255 | } |
7048a2b5 | 3256 | EXPORT_SYMBOL_GPL(dasd_generic_probe); |
1da177e4 | 3257 | |
1c01b8a5 HH |
3258 | /* |
3259 | * This will one day be called from a global not_oper handler. | |
3260 | * It is also used by driver_unregister during module unload. | |
3261 | */ | |
8e09f215 | 3262 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
3263 | { |
3264 | struct dasd_device *device; | |
8e09f215 | 3265 | struct dasd_block *block; |
1da177e4 | 3266 | |
59afda78 HH |
3267 | cdev->handler = NULL; |
3268 | ||
1da177e4 | 3269 | device = dasd_device_from_cdev(cdev); |
be4904e5 SW |
3270 | if (IS_ERR(device)) { |
3271 | dasd_remove_sysfs_files(cdev); | |
1da177e4 | 3272 | return; |
be4904e5 | 3273 | } |
d07dc5d8 SH |
3274 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) && |
3275 | !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
1da177e4 LT |
3276 | /* Already doing offline processing */ |
3277 | dasd_put_device(device); | |
be4904e5 | 3278 | dasd_remove_sysfs_files(cdev); |
1da177e4 LT |
3279 | return; |
3280 | } | |
3281 | /* | |
3282 | * This device is removed unconditionally. Set offline | |
3283 | * flag to prevent dasd_open from opening it while it is | |
3284 | * no quite down yet. | |
3285 | */ | |
3286 | dasd_set_target_state(device, DASD_STATE_NEW); | |
3287 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 | 3288 | block = device->block; |
1da177e4 | 3289 | dasd_delete_device(device); |
8e09f215 SW |
3290 | /* |
3291 | * life cycle of block is bound to device, so delete it after | |
3292 | * device was safely removed | |
3293 | */ | |
3294 | if (block) | |
3295 | dasd_free_block(block); | |
d07dc5d8 SH |
3296 | |
3297 | dasd_remove_sysfs_files(cdev); | |
1da177e4 | 3298 | } |
7048a2b5 | 3299 | EXPORT_SYMBOL_GPL(dasd_generic_remove); |
1da177e4 | 3300 | |
1c01b8a5 HH |
3301 | /* |
3302 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 3303 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
3304 | * or the user has started activation through sysfs. |
3305 | */ | |
8e09f215 SW |
3306 | int dasd_generic_set_online(struct ccw_device *cdev, |
3307 | struct dasd_discipline *base_discipline) | |
1da177e4 | 3308 | { |
aa88861f | 3309 | struct dasd_discipline *discipline; |
1da177e4 | 3310 | struct dasd_device *device; |
c6eb7b77 | 3311 | int rc; |
f24acd45 | 3312 | |
40545573 HH |
3313 | /* first online clears initial online feature flag */ |
3314 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
3315 | device = dasd_create_device(cdev); |
3316 | if (IS_ERR(device)) | |
3317 | return PTR_ERR(device); | |
3318 | ||
aa88861f | 3319 | discipline = base_discipline; |
c6eb7b77 | 3320 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 3321 | if (!dasd_diag_discipline_pointer) { |
fc19f381 SH |
3322 | pr_warning("%s Setting the DASD online failed because " |
3323 | "of missing DIAG discipline\n", | |
3324 | dev_name(&cdev->dev)); | |
1da177e4 LT |
3325 | dasd_delete_device(device); |
3326 | return -ENODEV; | |
3327 | } | |
3328 | discipline = dasd_diag_discipline_pointer; | |
3329 | } | |
aa88861f PO |
3330 | if (!try_module_get(base_discipline->owner)) { |
3331 | dasd_delete_device(device); | |
3332 | return -EINVAL; | |
3333 | } | |
3334 | if (!try_module_get(discipline->owner)) { | |
3335 | module_put(base_discipline->owner); | |
3336 | dasd_delete_device(device); | |
3337 | return -EINVAL; | |
3338 | } | |
3339 | device->base_discipline = base_discipline; | |
1da177e4 LT |
3340 | device->discipline = discipline; |
3341 | ||
8e09f215 | 3342 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
3343 | rc = discipline->check_device(device); |
3344 | if (rc) { | |
fc19f381 SH |
3345 | pr_warning("%s Setting the DASD online with discipline %s " |
3346 | "failed with rc=%i\n", | |
3347 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
3348 | module_put(discipline->owner); |
3349 | module_put(base_discipline->owner); | |
1da177e4 LT |
3350 | dasd_delete_device(device); |
3351 | return rc; | |
3352 | } | |
3353 | ||
3354 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
3355 | if (device->state <= DASD_STATE_KNOWN) { | |
fc19f381 SH |
3356 | pr_warning("%s Setting the DASD online failed because of a " |
3357 | "missing discipline\n", dev_name(&cdev->dev)); | |
1da177e4 LT |
3358 | rc = -ENODEV; |
3359 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
3360 | if (device->block) |
3361 | dasd_free_block(device->block); | |
1da177e4 LT |
3362 | dasd_delete_device(device); |
3363 | } else | |
3364 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 3365 | dev_name(&cdev->dev)); |
589c74d5 SH |
3366 | |
3367 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
3368 | ||
1da177e4 | 3369 | dasd_put_device(device); |
1da177e4 LT |
3370 | return rc; |
3371 | } | |
7048a2b5 | 3372 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); |
1da177e4 | 3373 | |
8e09f215 | 3374 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
3375 | { |
3376 | struct dasd_device *device; | |
8e09f215 | 3377 | struct dasd_block *block; |
d07dc5d8 | 3378 | int max_count, open_count, rc; |
1da177e4 | 3379 | |
d07dc5d8 | 3380 | rc = 0; |
1da177e4 LT |
3381 | device = dasd_device_from_cdev(cdev); |
3382 | if (IS_ERR(device)) | |
3383 | return PTR_ERR(device); | |
d07dc5d8 | 3384 | |
1da177e4 LT |
3385 | /* |
3386 | * We must make sure that this device is currently not in use. | |
3387 | * The open_count is increased for every opener, that includes | |
3388 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
3389 | * in the other openers. | |
3390 | */ | |
8e09f215 | 3391 | if (device->block) { |
a806170e HC |
3392 | max_count = device->block->bdev ? 0 : -1; |
3393 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
3394 | if (open_count > max_count) { |
3395 | if (open_count > 0) | |
fc19f381 SH |
3396 | pr_warning("%s: The DASD cannot be set offline " |
3397 | "with open count %i\n", | |
3398 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 3399 | else |
fc19f381 SH |
3400 | pr_warning("%s: The DASD cannot be set offline " |
3401 | "while it is in use\n", | |
3402 | dev_name(&cdev->dev)); | |
8e09f215 SW |
3403 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
3404 | dasd_put_device(device); | |
3405 | return -EBUSY; | |
3406 | } | |
1da177e4 | 3407 | } |
d07dc5d8 SH |
3408 | |
3409 | if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
3410 | /* | |
b4a96015 | 3411 | * safe offline already running |
d07dc5d8 SH |
3412 | * could only be called by normal offline so safe_offline flag |
3413 | * needs to be removed to run normal offline and kill all I/O | |
3414 | */ | |
3415 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
3416 | /* Already doing normal offline processing */ | |
3417 | dasd_put_device(device); | |
3418 | return -EBUSY; | |
3419 | } else | |
3420 | clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); | |
3421 | ||
3422 | } else | |
3423 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
3424 | /* Already doing offline processing */ | |
3425 | dasd_put_device(device); | |
3426 | return -EBUSY; | |
3427 | } | |
3428 | ||
3429 | /* | |
3430 | * if safe_offline called set safe_offline_running flag and | |
3431 | * clear safe_offline so that a call to normal offline | |
3432 | * can overrun safe_offline processing | |
3433 | */ | |
3434 | if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) && | |
3435 | !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
3436 | /* | |
3437 | * If we want to set the device safe offline all IO operations | |
3438 | * should be finished before continuing the offline process | |
3439 | * so sync bdev first and then wait for our queues to become | |
3440 | * empty | |
3441 | */ | |
3442 | /* sync blockdev and partitions */ | |
3443 | rc = fsync_bdev(device->block->bdev); | |
3444 | if (rc != 0) | |
3445 | goto interrupted; | |
3446 | ||
3447 | /* schedule device tasklet and wait for completion */ | |
3448 | dasd_schedule_device_bh(device); | |
3449 | rc = wait_event_interruptible(shutdown_waitq, | |
3450 | _wait_for_empty_queues(device)); | |
3451 | if (rc != 0) | |
3452 | goto interrupted; | |
3453 | } | |
3454 | ||
3455 | set_bit(DASD_FLAG_OFFLINE, &device->flags); | |
1da177e4 LT |
3456 | dasd_set_target_state(device, DASD_STATE_NEW); |
3457 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 | 3458 | block = device->block; |
1da177e4 | 3459 | dasd_delete_device(device); |
8e09f215 SW |
3460 | /* |
3461 | * life cycle of block is bound to device, so delete it after | |
3462 | * device was safely removed | |
3463 | */ | |
3464 | if (block) | |
3465 | dasd_free_block(block); | |
1da177e4 | 3466 | return 0; |
d07dc5d8 SH |
3467 | |
3468 | interrupted: | |
3469 | /* interrupted by signal */ | |
3470 | clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); | |
3471 | clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); | |
3472 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); | |
3473 | dasd_put_device(device); | |
3474 | return rc; | |
1da177e4 | 3475 | } |
7048a2b5 | 3476 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); |
1da177e4 | 3477 | |
a4d26c6a SW |
3478 | int dasd_generic_last_path_gone(struct dasd_device *device) |
3479 | { | |
3480 | struct dasd_ccw_req *cqr; | |
3481 | ||
3482 | dev_warn(&device->cdev->dev, "No operational channel path is left " | |
3483 | "for the device\n"); | |
3484 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); | |
3485 | /* First of all call extended error reporting. */ | |
3486 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
3487 | ||
3488 | if (device->state < DASD_STATE_BASIC) | |
3489 | return 0; | |
3490 | /* Device is active. We want to keep it. */ | |
3491 | list_for_each_entry(cqr, &device->ccw_queue, devlist) | |
3492 | if ((cqr->status == DASD_CQR_IN_IO) || | |
3493 | (cqr->status == DASD_CQR_CLEAR_PENDING)) { | |
3494 | cqr->status = DASD_CQR_QUEUED; | |
3495 | cqr->retries++; | |
3496 | } | |
3497 | dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); | |
3498 | dasd_device_clear_timer(device); | |
3499 | dasd_schedule_device_bh(device); | |
3500 | return 1; | |
3501 | } | |
3502 | EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); | |
3503 | ||
3504 | int dasd_generic_path_operational(struct dasd_device *device) | |
3505 | { | |
3506 | dev_info(&device->cdev->dev, "A channel path to the device has become " | |
3507 | "operational\n"); | |
3508 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); | |
3509 | dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); | |
3510 | if (device->stopped & DASD_UNRESUMED_PM) { | |
3511 | dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); | |
3512 | dasd_restore_device(device); | |
3513 | return 1; | |
3514 | } | |
3515 | dasd_schedule_device_bh(device); | |
3516 | if (device->block) | |
3517 | dasd_schedule_block_bh(device->block); | |
3518 | return 1; | |
3519 | } | |
3520 | EXPORT_SYMBOL_GPL(dasd_generic_path_operational); | |
3521 | ||
8e09f215 | 3522 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
3523 | { |
3524 | struct dasd_device *device; | |
1da177e4 LT |
3525 | int ret; |
3526 | ||
91c36919 | 3527 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
3528 | if (IS_ERR(device)) |
3529 | return 0; | |
1da177e4 LT |
3530 | ret = 0; |
3531 | switch (event) { | |
3532 | case CIO_GONE: | |
47593bfa | 3533 | case CIO_BOXED: |
1da177e4 | 3534 | case CIO_NO_PATH: |
a4d26c6a SW |
3535 | device->path_data.opm = 0; |
3536 | device->path_data.ppm = 0; | |
3537 | device->path_data.npm = 0; | |
3538 | ret = dasd_generic_last_path_gone(device); | |
1da177e4 LT |
3539 | break; |
3540 | case CIO_OPER: | |
1da177e4 | 3541 | ret = 1; |
a4d26c6a SW |
3542 | if (device->path_data.opm) |
3543 | ret = dasd_generic_path_operational(device); | |
1da177e4 LT |
3544 | break; |
3545 | } | |
1da177e4 LT |
3546 | dasd_put_device(device); |
3547 | return ret; | |
3548 | } | |
7048a2b5 | 3549 | EXPORT_SYMBOL_GPL(dasd_generic_notify); |
1da177e4 | 3550 | |
a4d26c6a SW |
3551 | void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) |
3552 | { | |
3553 | int chp; | |
3554 | __u8 oldopm, eventlpm; | |
3555 | struct dasd_device *device; | |
3556 | ||
3557 | device = dasd_device_from_cdev_locked(cdev); | |
3558 | if (IS_ERR(device)) | |
3559 | return; | |
3560 | for (chp = 0; chp < 8; chp++) { | |
3561 | eventlpm = 0x80 >> chp; | |
3562 | if (path_event[chp] & PE_PATH_GONE) { | |
3563 | oldopm = device->path_data.opm; | |
3564 | device->path_data.opm &= ~eventlpm; | |
3565 | device->path_data.ppm &= ~eventlpm; | |
3566 | device->path_data.npm &= ~eventlpm; | |
8b811bae SW |
3567 | if (oldopm && !device->path_data.opm) { |
3568 | dev_warn(&device->cdev->dev, | |
3569 | "No verified channel paths remain " | |
3570 | "for the device\n"); | |
3571 | DBF_DEV_EVENT(DBF_WARNING, device, | |
3572 | "%s", "last verified path gone"); | |
3573 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
3574 | dasd_device_set_stop_bits(device, | |
3575 | DASD_STOPPED_DC_WAIT); | |
3576 | } | |
a4d26c6a SW |
3577 | } |
3578 | if (path_event[chp] & PE_PATH_AVAILABLE) { | |
3579 | device->path_data.opm &= ~eventlpm; | |
3580 | device->path_data.ppm &= ~eventlpm; | |
3581 | device->path_data.npm &= ~eventlpm; | |
3582 | device->path_data.tbvpm |= eventlpm; | |
3583 | dasd_schedule_device_bh(device); | |
3584 | } | |
f1633031 | 3585 | if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { |
12d7b107 SH |
3586 | if (!(device->path_data.opm & eventlpm) && |
3587 | !(device->path_data.tbvpm & eventlpm)) { | |
3588 | /* | |
3589 | * we can not establish a pathgroup on an | |
3590 | * unavailable path, so trigger a path | |
3591 | * verification first | |
3592 | */ | |
3593 | device->path_data.tbvpm |= eventlpm; | |
3594 | dasd_schedule_device_bh(device); | |
3595 | } | |
f1633031 SH |
3596 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
3597 | "Pathgroup re-established\n"); | |
3598 | if (device->discipline->kick_validate) | |
3599 | device->discipline->kick_validate(device); | |
3600 | } | |
a4d26c6a SW |
3601 | } |
3602 | dasd_put_device(device); | |
3603 | } | |
3604 | EXPORT_SYMBOL_GPL(dasd_generic_path_event); | |
3605 | ||
3606 | int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) | |
3607 | { | |
3608 | if (!device->path_data.opm && lpm) { | |
3609 | device->path_data.opm = lpm; | |
3610 | dasd_generic_path_operational(device); | |
3611 | } else | |
3612 | device->path_data.opm |= lpm; | |
3613 | return 0; | |
3614 | } | |
3615 | EXPORT_SYMBOL_GPL(dasd_generic_verify_path); | |
3616 | ||
3617 | ||
d41dd122 SH |
3618 | int dasd_generic_pm_freeze(struct ccw_device *cdev) |
3619 | { | |
c5576876 SH |
3620 | struct dasd_device *device = dasd_device_from_cdev(cdev); |
3621 | struct list_head freeze_queue; | |
d41dd122 | 3622 | struct dasd_ccw_req *cqr, *n; |
c5576876 | 3623 | struct dasd_ccw_req *refers; |
d41dd122 | 3624 | int rc; |
d41dd122 SH |
3625 | |
3626 | if (IS_ERR(device)) | |
3627 | return PTR_ERR(device); | |
6f272b9c | 3628 | |
c8d1c0ff SH |
3629 | /* mark device as suspended */ |
3630 | set_bit(DASD_FLAG_SUSPENDED, &device->flags); | |
3631 | ||
6f272b9c SH |
3632 | if (device->discipline->freeze) |
3633 | rc = device->discipline->freeze(device); | |
3634 | ||
d41dd122 | 3635 | /* disallow new I/O */ |
eb6e199b | 3636 | dasd_device_set_stop_bits(device, DASD_STOPPED_PM); |
c5576876 SH |
3637 | |
3638 | /* clear active requests and requeue them to block layer if possible */ | |
d41dd122 SH |
3639 | INIT_LIST_HEAD(&freeze_queue); |
3640 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
3641 | rc = 0; | |
3642 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { | |
3643 | /* Check status and move request to flush_queue */ | |
3644 | if (cqr->status == DASD_CQR_IN_IO) { | |
3645 | rc = device->discipline->term_IO(cqr); | |
3646 | if (rc) { | |
3647 | /* unable to terminate requeust */ | |
3648 | dev_err(&device->cdev->dev, | |
3649 | "Unable to terminate request %p " | |
3650 | "on suspend\n", cqr); | |
3651 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
3652 | dasd_put_device(device); | |
3653 | return rc; | |
3654 | } | |
3655 | } | |
3656 | list_move_tail(&cqr->devlist, &freeze_queue); | |
3657 | } | |
d41dd122 SH |
3658 | spin_unlock_irq(get_ccwdev_lock(cdev)); |
3659 | ||
3660 | list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { | |
3661 | wait_event(dasd_flush_wq, | |
3662 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
3663 | if (cqr->status == DASD_CQR_CLEARED) | |
3664 | cqr->status = DASD_CQR_QUEUED; | |
c5576876 SH |
3665 | |
3666 | /* requeue requests to blocklayer will only work for | |
3667 | block device requests */ | |
3668 | if (_dasd_requeue_request(cqr)) | |
3669 | continue; | |
3670 | ||
3671 | /* remove requests from device and block queue */ | |
3672 | list_del_init(&cqr->devlist); | |
3673 | while (cqr->refers != NULL) { | |
3674 | refers = cqr->refers; | |
3675 | /* remove the request from the block queue */ | |
3676 | list_del(&cqr->blocklist); | |
3677 | /* free the finished erp request */ | |
3678 | dasd_free_erp_request(cqr, cqr->memdev); | |
3679 | cqr = refers; | |
3680 | } | |
3681 | if (cqr->block) | |
3682 | list_del_init(&cqr->blocklist); | |
3683 | cqr->block->base->discipline->free_cp( | |
3684 | cqr, (struct request *) cqr->callback_data); | |
d41dd122 | 3685 | } |
d41dd122 | 3686 | |
c5576876 SH |
3687 | /* |
3688 | * if requests remain then they are internal request | |
3689 | * and go back to the device queue | |
3690 | */ | |
3691 | if (!list_empty(&freeze_queue)) { | |
3692 | /* move freeze_queue to start of the ccw_queue */ | |
3693 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
3694 | list_splice_tail(&freeze_queue, &device->ccw_queue); | |
3695 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
3696 | } | |
d41dd122 SH |
3697 | dasd_put_device(device); |
3698 | return rc; | |
3699 | } | |
3700 | EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); | |
3701 | ||
3702 | int dasd_generic_restore_device(struct ccw_device *cdev) | |
3703 | { | |
3704 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
3705 | int rc = 0; | |
3706 | ||
3707 | if (IS_ERR(device)) | |
3708 | return PTR_ERR(device); | |
3709 | ||
e6125fba | 3710 | /* allow new IO again */ |
eb6e199b SW |
3711 | dasd_device_remove_stop_bits(device, |
3712 | (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); | |
e6125fba | 3713 | |
d41dd122 | 3714 | dasd_schedule_device_bh(device); |
d41dd122 | 3715 | |
eb6e199b SW |
3716 | /* |
3717 | * call discipline restore function | |
3718 | * if device is stopped do nothing e.g. for disconnected devices | |
3719 | */ | |
3720 | if (device->discipline->restore && !(device->stopped)) | |
d41dd122 | 3721 | rc = device->discipline->restore(device); |
eb6e199b | 3722 | if (rc || device->stopped) |
e6125fba SH |
3723 | /* |
3724 | * if the resume failed for the DASD we put it in | |
3725 | * an UNRESUMED stop state | |
3726 | */ | |
3727 | device->stopped |= DASD_UNRESUMED_PM; | |
d41dd122 | 3728 | |
6fca97a9 SH |
3729 | if (device->block) |
3730 | dasd_schedule_block_bh(device->block); | |
3731 | ||
c8d1c0ff | 3732 | clear_bit(DASD_FLAG_SUSPENDED, &device->flags); |
d41dd122 | 3733 | dasd_put_device(device); |
e6125fba | 3734 | return 0; |
d41dd122 SH |
3735 | } |
3736 | EXPORT_SYMBOL_GPL(dasd_generic_restore_device); | |
3737 | ||
763968e2 HC |
3738 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
3739 | void *rdc_buffer, | |
3740 | int rdc_buffer_size, | |
68b781fe | 3741 | int magic) |
17283b56 CH |
3742 | { |
3743 | struct dasd_ccw_req *cqr; | |
3744 | struct ccw1 *ccw; | |
d9fa9441 | 3745 | unsigned long *idaw; |
17283b56 CH |
3746 | |
3747 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
3748 | ||
3749 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
3750 | /* internal error 13 - Allocating the RDC request failed*/ |
3751 | dev_err(&device->cdev->dev, | |
3752 | "An error occurred in the DASD device driver, " | |
3753 | "reason=%s\n", "13"); | |
17283b56 CH |
3754 | return cqr; |
3755 | } | |
3756 | ||
3757 | ccw = cqr->cpaddr; | |
3758 | ccw->cmd_code = CCW_CMD_RDC; | |
d9fa9441 SH |
3759 | if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { |
3760 | idaw = (unsigned long *) (cqr->data); | |
3761 | ccw->cda = (__u32)(addr_t) idaw; | |
3762 | ccw->flags = CCW_FLAG_IDA; | |
3763 | idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); | |
3764 | } else { | |
3765 | ccw->cda = (__u32)(addr_t) rdc_buffer; | |
3766 | ccw->flags = 0; | |
3767 | } | |
17283b56 | 3768 | |
d9fa9441 | 3769 | ccw->count = rdc_buffer_size; |
8e09f215 SW |
3770 | cqr->startdev = device; |
3771 | cqr->memdev = device; | |
17283b56 | 3772 | cqr->expires = 10*HZ; |
eb6e199b | 3773 | cqr->retries = 256; |
1aae0560 | 3774 | cqr->buildclk = get_tod_clock(); |
17283b56 CH |
3775 | cqr->status = DASD_CQR_FILLED; |
3776 | return cqr; | |
3777 | } | |
3778 | ||
3779 | ||
68b781fe | 3780 | int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
92636b15 | 3781 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
3782 | { |
3783 | int ret; | |
3784 | struct dasd_ccw_req *cqr; | |
3785 | ||
92636b15 | 3786 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
3787 | magic); |
3788 | if (IS_ERR(cqr)) | |
3789 | return PTR_ERR(cqr); | |
3790 | ||
3791 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 3792 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
3793 | return ret; |
3794 | } | |
aaff0f64 | 3795 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 3796 | |
f3eb5384 SW |
3797 | /* |
3798 | * In command mode and transport mode we need to look for sense | |
3799 | * data in different places. The sense data itself is allways | |
3800 | * an array of 32 bytes, so we can unify the sense data access | |
3801 | * for both modes. | |
3802 | */ | |
3803 | char *dasd_get_sense(struct irb *irb) | |
3804 | { | |
3805 | struct tsb *tsb = NULL; | |
3806 | char *sense = NULL; | |
3807 | ||
3808 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
3809 | if (irb->scsw.tm.tcw) | |
3810 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
3811 | irb->scsw.tm.tcw); | |
3812 | if (tsb && tsb->length == 64 && tsb->flags) | |
3813 | switch (tsb->flags & 0x07) { | |
3814 | case 1: /* tsa_iostat */ | |
3815 | sense = tsb->tsa.iostat.sense; | |
3816 | break; | |
3817 | case 2: /* tsa_ddpc */ | |
3818 | sense = tsb->tsa.ddpc.sense; | |
3819 | break; | |
3820 | default: | |
3821 | /* currently we don't use interrogate data */ | |
3822 | break; | |
3823 | } | |
3824 | } else if (irb->esw.esw0.erw.cons) { | |
3825 | sense = irb->ecw; | |
3826 | } | |
3827 | return sense; | |
3828 | } | |
3829 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
3830 | ||
4679e893 SH |
3831 | void dasd_generic_shutdown(struct ccw_device *cdev) |
3832 | { | |
3833 | struct dasd_device *device; | |
3834 | ||
3835 | device = dasd_device_from_cdev(cdev); | |
3836 | if (IS_ERR(device)) | |
3837 | return; | |
3838 | ||
3839 | if (device->block) | |
3840 | dasd_schedule_block_bh(device->block); | |
3841 | ||
3842 | dasd_schedule_device_bh(device); | |
3843 | ||
3844 | wait_event(shutdown_waitq, _wait_for_empty_queues(device)); | |
3845 | } | |
3846 | EXPORT_SYMBOL_GPL(dasd_generic_shutdown); | |
3847 | ||
8e09f215 | 3848 | static int __init dasd_init(void) |
1da177e4 LT |
3849 | { |
3850 | int rc; | |
3851 | ||
3852 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 3853 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 3854 | init_waitqueue_head(&generic_waitq); |
4679e893 | 3855 | init_waitqueue_head(&shutdown_waitq); |
1da177e4 LT |
3856 | |
3857 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 3858 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
3859 | if (dasd_debug_area == NULL) { |
3860 | rc = -ENOMEM; | |
3861 | goto failed; | |
3862 | } | |
3863 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 3864 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
3865 | |
3866 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
3867 | ||
3868 | dasd_diag_discipline_pointer = NULL; | |
3869 | ||
4fa52aa7 SW |
3870 | dasd_statistics_createroot(); |
3871 | ||
1da177e4 LT |
3872 | rc = dasd_devmap_init(); |
3873 | if (rc) | |
3874 | goto failed; | |
3875 | rc = dasd_gendisk_init(); | |
3876 | if (rc) | |
3877 | goto failed; | |
3878 | rc = dasd_parse(); | |
3879 | if (rc) | |
3880 | goto failed; | |
20c64468 SW |
3881 | rc = dasd_eer_init(); |
3882 | if (rc) | |
3883 | goto failed; | |
1da177e4 LT |
3884 | #ifdef CONFIG_PROC_FS |
3885 | rc = dasd_proc_init(); | |
3886 | if (rc) | |
3887 | goto failed; | |
3888 | #endif | |
3889 | ||
3890 | return 0; | |
3891 | failed: | |
fc19f381 | 3892 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
3893 | dasd_exit(); |
3894 | return rc; | |
3895 | } | |
3896 | ||
3897 | module_init(dasd_init); | |
3898 | module_exit(dasd_exit); |