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