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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 | ||
7c53fcb3 PO |
41 | #define DASD_DIAG_MOD "dasd_diag_mod" |
42 | ||
1da177e4 LT |
43 | /* |
44 | * SECTION: exported variables of dasd.c | |
45 | */ | |
46 | debug_info_t *dasd_debug_area; | |
7048a2b5 | 47 | EXPORT_SYMBOL(dasd_debug_area); |
4fa52aa7 | 48 | static struct dentry *dasd_debugfs_root_entry; |
1da177e4 | 49 | struct dasd_discipline *dasd_diag_discipline_pointer; |
7048a2b5 | 50 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); |
2b67fc46 | 51 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
52 | |
53 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
54 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
a53c8fab | 55 | " Copyright IBM Corp. 2000"); |
1da177e4 | 56 | MODULE_SUPPORTED_DEVICE("dasd"); |
1da177e4 LT |
57 | MODULE_LICENSE("GPL"); |
58 | ||
59 | /* | |
60 | * SECTION: prototypes for static functions of dasd.c | |
61 | */ | |
8e09f215 SW |
62 | static int dasd_alloc_queue(struct dasd_block *); |
63 | static void dasd_setup_queue(struct dasd_block *); | |
64 | static void dasd_free_queue(struct dasd_block *); | |
65 | static void dasd_flush_request_queue(struct dasd_block *); | |
66 | static int dasd_flush_block_queue(struct dasd_block *); | |
67 | static void dasd_device_tasklet(struct dasd_device *); | |
68 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 69 | static void do_kick_device(struct work_struct *); |
d41dd122 | 70 | static void do_restore_device(struct work_struct *); |
501183f2 | 71 | static void do_reload_device(struct work_struct *); |
a521b048 | 72 | static void do_requeue_requests(struct work_struct *); |
8e09f215 | 73 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
48cae885 SW |
74 | static void dasd_device_timeout(unsigned long); |
75 | static void dasd_block_timeout(unsigned long); | |
eb6e199b | 76 | static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); |
4fa52aa7 SW |
77 | static void dasd_profile_init(struct dasd_profile *, struct dentry *); |
78 | static void dasd_profile_exit(struct dasd_profile *); | |
5a3b7b11 SH |
79 | static void dasd_hosts_init(struct dentry *, struct dasd_device *); |
80 | static void dasd_hosts_exit(struct dasd_device *); | |
1da177e4 LT |
81 | |
82 | /* | |
83 | * SECTION: Operations on the device structure. | |
84 | */ | |
85 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 86 | static wait_queue_head_t dasd_flush_wq; |
c80ee724 | 87 | static wait_queue_head_t generic_waitq; |
4679e893 | 88 | static wait_queue_head_t shutdown_waitq; |
1da177e4 LT |
89 | |
90 | /* | |
91 | * Allocate memory for a new device structure. | |
92 | */ | |
8e09f215 | 93 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
94 | { |
95 | struct dasd_device *device; | |
96 | ||
8e09f215 SW |
97 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
98 | if (!device) | |
1da177e4 | 99 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
100 | |
101 | /* Get two pages for normal block device operations. */ | |
102 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 103 | if (!device->ccw_mem) { |
1da177e4 LT |
104 | kfree(device); |
105 | return ERR_PTR(-ENOMEM); | |
106 | } | |
107 | /* Get one page for error recovery. */ | |
108 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 109 | if (!device->erp_mem) { |
1da177e4 LT |
110 | free_pages((unsigned long) device->ccw_mem, 1); |
111 | kfree(device); | |
112 | return ERR_PTR(-ENOMEM); | |
113 | } | |
114 | ||
115 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
116 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
117 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 118 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 119 | tasklet_init(&device->tasklet, |
8e09f215 | 120 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
121 | (unsigned long) device); |
122 | INIT_LIST_HEAD(&device->ccw_queue); | |
123 | init_timer(&device->timer); | |
48cae885 SW |
124 | device->timer.function = dasd_device_timeout; |
125 | device->timer.data = (unsigned long) device; | |
4927b3f7 | 126 | INIT_WORK(&device->kick_work, do_kick_device); |
d41dd122 | 127 | INIT_WORK(&device->restore_device, do_restore_device); |
501183f2 | 128 | INIT_WORK(&device->reload_device, do_reload_device); |
a521b048 | 129 | INIT_WORK(&device->requeue_requests, do_requeue_requests); |
1da177e4 LT |
130 | device->state = DASD_STATE_NEW; |
131 | device->target = DASD_STATE_NEW; | |
9eb25122 | 132 | mutex_init(&device->state_mutex); |
4fa52aa7 | 133 | spin_lock_init(&device->profile.lock); |
1da177e4 LT |
134 | return device; |
135 | } | |
136 | ||
137 | /* | |
138 | * Free memory of a device structure. | |
139 | */ | |
8e09f215 | 140 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 141 | { |
17fd682e | 142 | kfree(device->private); |
1da177e4 LT |
143 | free_page((unsigned long) device->erp_mem); |
144 | free_pages((unsigned long) device->ccw_mem, 1); | |
145 | kfree(device); | |
146 | } | |
147 | ||
8e09f215 SW |
148 | /* |
149 | * Allocate memory for a new device structure. | |
150 | */ | |
151 | struct dasd_block *dasd_alloc_block(void) | |
152 | { | |
153 | struct dasd_block *block; | |
154 | ||
155 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
156 | if (!block) | |
157 | return ERR_PTR(-ENOMEM); | |
158 | /* open_count = 0 means device online but not in use */ | |
159 | atomic_set(&block->open_count, -1); | |
160 | ||
161 | spin_lock_init(&block->request_queue_lock); | |
162 | atomic_set(&block->tasklet_scheduled, 0); | |
163 | tasklet_init(&block->tasklet, | |
164 | (void (*)(unsigned long)) dasd_block_tasklet, | |
165 | (unsigned long) block); | |
166 | INIT_LIST_HEAD(&block->ccw_queue); | |
167 | spin_lock_init(&block->queue_lock); | |
168 | init_timer(&block->timer); | |
48cae885 SW |
169 | block->timer.function = dasd_block_timeout; |
170 | block->timer.data = (unsigned long) block; | |
4fa52aa7 | 171 | spin_lock_init(&block->profile.lock); |
8e09f215 SW |
172 | |
173 | return block; | |
174 | } | |
7048a2b5 | 175 | EXPORT_SYMBOL_GPL(dasd_alloc_block); |
8e09f215 SW |
176 | |
177 | /* | |
178 | * Free memory of a device structure. | |
179 | */ | |
180 | void dasd_free_block(struct dasd_block *block) | |
181 | { | |
182 | kfree(block); | |
183 | } | |
7048a2b5 | 184 | EXPORT_SYMBOL_GPL(dasd_free_block); |
8e09f215 | 185 | |
1da177e4 LT |
186 | /* |
187 | * Make a new device known to the system. | |
188 | */ | |
8e09f215 | 189 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
190 | { |
191 | int rc; | |
192 | ||
193 | /* | |
138c014d | 194 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
195 | * keep the reference count > 0. |
196 | */ | |
197 | dasd_get_device(device); | |
198 | ||
8e09f215 SW |
199 | if (device->block) { |
200 | rc = dasd_alloc_queue(device->block); | |
201 | if (rc) { | |
202 | dasd_put_device(device); | |
203 | return rc; | |
204 | } | |
1da177e4 | 205 | } |
1da177e4 LT |
206 | device->state = DASD_STATE_KNOWN; |
207 | return 0; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Let the system forget about a device. | |
212 | */ | |
8e09f215 | 213 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 214 | { |
20c64468 SW |
215 | /* Disable extended error reporting for this device. */ |
216 | dasd_eer_disable(device); | |
1da177e4 LT |
217 | device->state = DASD_STATE_NEW; |
218 | ||
8e09f215 SW |
219 | if (device->block) |
220 | dasd_free_queue(device->block); | |
1da177e4 LT |
221 | |
222 | /* Give up reference we took in dasd_state_new_to_known. */ | |
223 | dasd_put_device(device); | |
8f61701b | 224 | return 0; |
1da177e4 LT |
225 | } |
226 | ||
4fa52aa7 SW |
227 | static struct dentry *dasd_debugfs_setup(const char *name, |
228 | struct dentry *base_dentry) | |
229 | { | |
230 | struct dentry *pde; | |
231 | ||
232 | if (!base_dentry) | |
233 | return NULL; | |
234 | pde = debugfs_create_dir(name, base_dentry); | |
235 | if (!pde || IS_ERR(pde)) | |
236 | return NULL; | |
237 | return pde; | |
238 | } | |
239 | ||
1da177e4 LT |
240 | /* |
241 | * Request the irq line for the device. | |
242 | */ | |
8e09f215 | 243 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 | 244 | { |
4fa52aa7 | 245 | struct dasd_block *block = device->block; |
d42e1712 | 246 | int rc = 0; |
1da177e4 LT |
247 | |
248 | /* Allocate and register gendisk structure. */ | |
4fa52aa7 SW |
249 | if (block) { |
250 | rc = dasd_gendisk_alloc(block); | |
8e09f215 SW |
251 | if (rc) |
252 | return rc; | |
4fa52aa7 SW |
253 | block->debugfs_dentry = |
254 | dasd_debugfs_setup(block->gdp->disk_name, | |
255 | dasd_debugfs_root_entry); | |
256 | dasd_profile_init(&block->profile, block->debugfs_dentry); | |
257 | if (dasd_global_profile_level == DASD_PROFILE_ON) | |
258 | dasd_profile_on(&device->block->profile); | |
259 | } | |
260 | device->debugfs_dentry = | |
261 | dasd_debugfs_setup(dev_name(&device->cdev->dev), | |
262 | dasd_debugfs_root_entry); | |
263 | dasd_profile_init(&device->profile, device->debugfs_dentry); | |
5a3b7b11 | 264 | dasd_hosts_init(device->debugfs_dentry, device); |
4fa52aa7 | 265 | |
1da177e4 | 266 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 267 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 268 | 8 * sizeof(long)); |
1da177e4 | 269 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 270 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
271 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
272 | ||
273 | device->state = DASD_STATE_BASIC; | |
d42e1712 SH |
274 | |
275 | return rc; | |
1da177e4 LT |
276 | } |
277 | ||
278 | /* | |
279 | * Release the irq line for the device. Terminate any running i/o. | |
280 | */ | |
8e09f215 | 281 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 282 | { |
8f61701b | 283 | int rc; |
d42e1712 | 284 | |
daa991bf SH |
285 | if (device->discipline->basic_to_known) { |
286 | rc = device->discipline->basic_to_known(device); | |
287 | if (rc) | |
288 | return rc; | |
289 | } | |
290 | ||
8e09f215 | 291 | if (device->block) { |
4fa52aa7 | 292 | dasd_profile_exit(&device->block->profile); |
d7309aaa | 293 | debugfs_remove(device->block->debugfs_dentry); |
8e09f215 SW |
294 | dasd_gendisk_free(device->block); |
295 | dasd_block_clear_timer(device->block); | |
296 | } | |
297 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
298 | if (rc) |
299 | return rc; | |
8e09f215 | 300 | dasd_device_clear_timer(device); |
4fa52aa7 | 301 | dasd_profile_exit(&device->profile); |
5a3b7b11 | 302 | dasd_hosts_exit(device); |
d7309aaa | 303 | debugfs_remove(device->debugfs_dentry); |
1da177e4 LT |
304 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
305 | if (device->debug_area != NULL) { | |
306 | debug_unregister(device->debug_area); | |
307 | device->debug_area = NULL; | |
308 | } | |
309 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 310 | return 0; |
1da177e4 LT |
311 | } |
312 | ||
313 | /* | |
314 | * Do the initial analysis. The do_analysis function may return | |
315 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
316 | * until the discipline decides to continue the startup sequence | |
317 | * by calling the function dasd_change_state. The eckd disciplines | |
318 | * uses this to start a ccw that detects the format. The completion | |
319 | * interrupt for this detection ccw uses the kernel event daemon to | |
320 | * trigger the call to dasd_change_state. All this is done in the | |
321 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
322 | * After the analysis ccw is done (do_analysis returned 0) the block |
323 | * device is setup. | |
324 | * In case the analysis returns an error, the device setup is stopped | |
325 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 326 | */ |
8e09f215 | 327 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
328 | { |
329 | int rc; | |
8e09f215 | 330 | struct dasd_block *block; |
eed5c4b1 | 331 | struct gendisk *disk; |
1da177e4 LT |
332 | |
333 | rc = 0; | |
8e09f215 | 334 | block = device->block; |
90f0094d | 335 | /* make disk known with correct capacity */ |
8e09f215 SW |
336 | if (block) { |
337 | if (block->base->discipline->do_analysis != NULL) | |
338 | rc = block->base->discipline->do_analysis(block); | |
339 | if (rc) { | |
d42e1712 | 340 | if (rc != -EAGAIN) { |
8e09f215 | 341 | device->state = DASD_STATE_UNFMT; |
eed5c4b1 SH |
342 | disk = device->block->gdp; |
343 | kobject_uevent(&disk_to_dev(disk)->kobj, | |
344 | KOBJ_CHANGE); | |
d42e1712 SH |
345 | goto out; |
346 | } | |
8e09f215 SW |
347 | return rc; |
348 | } | |
349 | dasd_setup_queue(block); | |
350 | set_capacity(block->gdp, | |
351 | block->blocks << block->s2b_shift); | |
352 | device->state = DASD_STATE_READY; | |
353 | rc = dasd_scan_partitions(block); | |
d42e1712 | 354 | if (rc) { |
8e09f215 | 355 | device->state = DASD_STATE_BASIC; |
d42e1712 SH |
356 | return rc; |
357 | } | |
8e09f215 SW |
358 | } else { |
359 | device->state = DASD_STATE_READY; | |
360 | } | |
d42e1712 SH |
361 | out: |
362 | if (device->discipline->basic_to_ready) | |
363 | rc = device->discipline->basic_to_ready(device); | |
90f0094d | 364 | return rc; |
1da177e4 LT |
365 | } |
366 | ||
d07dc5d8 SH |
367 | static inline |
368 | int _wait_for_empty_queues(struct dasd_device *device) | |
369 | { | |
370 | if (device->block) | |
371 | return list_empty(&device->ccw_queue) && | |
372 | list_empty(&device->block->ccw_queue); | |
373 | else | |
374 | return list_empty(&device->ccw_queue); | |
375 | } | |
376 | ||
1da177e4 LT |
377 | /* |
378 | * Remove device from block device layer. Destroy dirty buffers. | |
379 | * Forget format information. Check if the target level is basic | |
380 | * and if it is create fake disk for formatting. | |
381 | */ | |
8e09f215 | 382 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 383 | { |
8f61701b HH |
384 | int rc; |
385 | ||
1da177e4 | 386 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
387 | if (device->block) { |
388 | struct dasd_block *block = device->block; | |
389 | rc = dasd_flush_block_queue(block); | |
390 | if (rc) { | |
391 | device->state = DASD_STATE_READY; | |
392 | return rc; | |
393 | } | |
8e09f215 | 394 | dasd_flush_request_queue(block); |
b695adfa | 395 | dasd_destroy_partitions(block); |
8e09f215 SW |
396 | block->blocks = 0; |
397 | block->bp_block = 0; | |
398 | block->s2b_shift = 0; | |
399 | } | |
8f61701b | 400 | return 0; |
1da177e4 LT |
401 | } |
402 | ||
90f0094d HH |
403 | /* |
404 | * Back to basic. | |
405 | */ | |
8e09f215 | 406 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
407 | { |
408 | device->state = DASD_STATE_BASIC; | |
8f61701b | 409 | return 0; |
90f0094d HH |
410 | } |
411 | ||
1da177e4 LT |
412 | /* |
413 | * Make the device online and schedule the bottom half to start | |
414 | * the requeueing of requests from the linux request queue to the | |
415 | * ccw queue. | |
416 | */ | |
8f61701b | 417 | static int |
1da177e4 LT |
418 | dasd_state_ready_to_online(struct dasd_device * device) |
419 | { | |
1301809b SW |
420 | struct gendisk *disk; |
421 | struct disk_part_iter piter; | |
422 | struct hd_struct *part; | |
8e09f215 | 423 | |
1da177e4 | 424 | device->state = DASD_STATE_ONLINE; |
1301809b | 425 | if (device->block) { |
8e09f215 | 426 | dasd_schedule_block_bh(device->block); |
e4dbb0f2 SH |
427 | if ((device->features & DASD_FEATURE_USERAW)) { |
428 | disk = device->block->gdp; | |
429 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
430 | return 0; | |
431 | } | |
1301809b SW |
432 | disk = device->block->bdev->bd_disk; |
433 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
434 | while ((part = disk_part_iter_next(&piter))) | |
435 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
436 | disk_part_iter_exit(&piter); | |
437 | } | |
1da177e4 LT |
438 | return 0; |
439 | } | |
440 | ||
441 | /* | |
442 | * Stop the requeueing of requests again. | |
443 | */ | |
8e09f215 | 444 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 445 | { |
8e09f215 | 446 | int rc; |
1301809b SW |
447 | struct gendisk *disk; |
448 | struct disk_part_iter piter; | |
449 | struct hd_struct *part; | |
8e09f215 SW |
450 | |
451 | if (device->discipline->online_to_ready) { | |
452 | rc = device->discipline->online_to_ready(device); | |
453 | if (rc) | |
454 | return rc; | |
455 | } | |
d42e1712 | 456 | |
1da177e4 | 457 | device->state = DASD_STATE_READY; |
e4dbb0f2 | 458 | if (device->block && !(device->features & DASD_FEATURE_USERAW)) { |
1301809b SW |
459 | disk = device->block->bdev->bd_disk; |
460 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
461 | while ((part = disk_part_iter_next(&piter))) | |
462 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
463 | disk_part_iter_exit(&piter); | |
464 | } | |
8f61701b | 465 | return 0; |
1da177e4 LT |
466 | } |
467 | ||
468 | /* | |
469 | * Device startup state changes. | |
470 | */ | |
8e09f215 | 471 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
472 | { |
473 | int rc; | |
474 | ||
475 | rc = 0; | |
476 | if (device->state == DASD_STATE_NEW && | |
477 | device->target >= DASD_STATE_KNOWN) | |
478 | rc = dasd_state_new_to_known(device); | |
479 | ||
480 | if (!rc && | |
481 | device->state == DASD_STATE_KNOWN && | |
482 | device->target >= DASD_STATE_BASIC) | |
483 | rc = dasd_state_known_to_basic(device); | |
484 | ||
485 | if (!rc && | |
486 | device->state == DASD_STATE_BASIC && | |
487 | device->target >= DASD_STATE_READY) | |
488 | rc = dasd_state_basic_to_ready(device); | |
489 | ||
39ccf95e HH |
490 | if (!rc && |
491 | device->state == DASD_STATE_UNFMT && | |
492 | device->target > DASD_STATE_UNFMT) | |
493 | rc = -EPERM; | |
494 | ||
1da177e4 LT |
495 | if (!rc && |
496 | device->state == DASD_STATE_READY && | |
497 | device->target >= DASD_STATE_ONLINE) | |
498 | rc = dasd_state_ready_to_online(device); | |
499 | ||
500 | return rc; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Device shutdown state changes. | |
505 | */ | |
8e09f215 | 506 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 507 | { |
8f61701b HH |
508 | int rc; |
509 | ||
510 | rc = 0; | |
1da177e4 LT |
511 | if (device->state == DASD_STATE_ONLINE && |
512 | device->target <= DASD_STATE_READY) | |
8f61701b | 513 | rc = dasd_state_online_to_ready(device); |
138c014d | 514 | |
8f61701b HH |
515 | if (!rc && |
516 | device->state == DASD_STATE_READY && | |
1da177e4 | 517 | device->target <= DASD_STATE_BASIC) |
8f61701b | 518 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 519 | |
8f61701b HH |
520 | if (!rc && |
521 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 522 | device->target <= DASD_STATE_BASIC) |
8f61701b | 523 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 524 | |
8f61701b HH |
525 | if (!rc && |
526 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 527 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 528 | rc = dasd_state_basic_to_known(device); |
138c014d | 529 | |
8f61701b HH |
530 | if (!rc && |
531 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 532 | device->target <= DASD_STATE_NEW) |
8f61701b | 533 | rc = dasd_state_known_to_new(device); |
1da177e4 | 534 | |
8f61701b | 535 | return rc; |
1da177e4 LT |
536 | } |
537 | ||
538 | /* | |
539 | * This is the main startup/shutdown routine. | |
540 | */ | |
8e09f215 | 541 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 | 542 | { |
181d9522 | 543 | int rc; |
1da177e4 LT |
544 | |
545 | if (device->state == device->target) | |
546 | /* Already where we want to go today... */ | |
547 | return; | |
548 | if (device->state < device->target) | |
549 | rc = dasd_increase_state(device); | |
550 | else | |
551 | rc = dasd_decrease_state(device); | |
181d9522 SO |
552 | if (rc == -EAGAIN) |
553 | return; | |
554 | if (rc) | |
555 | device->target = device->state; | |
1da177e4 | 556 | |
4dfd5c45 HH |
557 | /* let user-space know that the device status changed */ |
558 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1f08be80 SO |
559 | |
560 | if (device->state == device->target) | |
561 | wake_up(&dasd_init_waitq); | |
1da177e4 LT |
562 | } |
563 | ||
564 | /* | |
565 | * Kick starter for devices that did not complete the startup/shutdown | |
566 | * procedure or were sleeping because of a pending state. | |
567 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
568 | * event daemon. | |
569 | */ | |
8e09f215 | 570 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 571 | { |
4927b3f7 | 572 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
9eb25122 | 573 | mutex_lock(&device->state_mutex); |
1da177e4 | 574 | dasd_change_state(device); |
9eb25122 | 575 | mutex_unlock(&device->state_mutex); |
8e09f215 | 576 | dasd_schedule_device_bh(device); |
1da177e4 LT |
577 | dasd_put_device(device); |
578 | } | |
579 | ||
8e09f215 | 580 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
581 | { |
582 | dasd_get_device(device); | |
583 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
f2608cd4 SH |
584 | if (!schedule_work(&device->kick_work)) |
585 | dasd_put_device(device); | |
1da177e4 | 586 | } |
7048a2b5 | 587 | EXPORT_SYMBOL(dasd_kick_device); |
1da177e4 | 588 | |
501183f2 SH |
589 | /* |
590 | * dasd_reload_device will schedule a call do do_reload_device to the kernel | |
591 | * event daemon. | |
592 | */ | |
593 | static void do_reload_device(struct work_struct *work) | |
594 | { | |
595 | struct dasd_device *device = container_of(work, struct dasd_device, | |
596 | reload_device); | |
597 | device->discipline->reload(device); | |
598 | dasd_put_device(device); | |
599 | } | |
600 | ||
601 | void dasd_reload_device(struct dasd_device *device) | |
602 | { | |
603 | dasd_get_device(device); | |
604 | /* queue call to dasd_reload_device to the kernel event daemon. */ | |
f2608cd4 SH |
605 | if (!schedule_work(&device->reload_device)) |
606 | dasd_put_device(device); | |
501183f2 SH |
607 | } |
608 | EXPORT_SYMBOL(dasd_reload_device); | |
609 | ||
d41dd122 SH |
610 | /* |
611 | * dasd_restore_device will schedule a call do do_restore_device to the kernel | |
612 | * event daemon. | |
613 | */ | |
614 | static void do_restore_device(struct work_struct *work) | |
615 | { | |
616 | struct dasd_device *device = container_of(work, struct dasd_device, | |
617 | restore_device); | |
618 | device->cdev->drv->restore(device->cdev); | |
619 | dasd_put_device(device); | |
620 | } | |
621 | ||
622 | void dasd_restore_device(struct dasd_device *device) | |
623 | { | |
624 | dasd_get_device(device); | |
625 | /* queue call to dasd_restore_device to the kernel event daemon. */ | |
f2608cd4 SH |
626 | if (!schedule_work(&device->restore_device)) |
627 | dasd_put_device(device); | |
d41dd122 SH |
628 | } |
629 | ||
1da177e4 LT |
630 | /* |
631 | * Set the target state for a device and starts the state change. | |
632 | */ | |
8e09f215 | 633 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 634 | { |
f3445a1a | 635 | dasd_get_device(device); |
9eb25122 | 636 | mutex_lock(&device->state_mutex); |
1da177e4 LT |
637 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
638 | if (dasd_probeonly && target > DASD_STATE_READY) | |
639 | target = DASD_STATE_READY; | |
640 | if (device->target != target) { | |
9eb25122 | 641 | if (device->state == target) |
1da177e4 LT |
642 | wake_up(&dasd_init_waitq); |
643 | device->target = target; | |
644 | } | |
645 | if (device->state != device->target) | |
646 | dasd_change_state(device); | |
9eb25122 SH |
647 | mutex_unlock(&device->state_mutex); |
648 | dasd_put_device(device); | |
1da177e4 | 649 | } |
7048a2b5 | 650 | EXPORT_SYMBOL(dasd_set_target_state); |
1da177e4 LT |
651 | |
652 | /* | |
653 | * Enable devices with device numbers in [from..to]. | |
654 | */ | |
8e09f215 | 655 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
656 | { |
657 | return (device->state == device->target); | |
658 | } | |
659 | ||
8e09f215 | 660 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
661 | { |
662 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
663 | if (device->state <= DASD_STATE_KNOWN) | |
664 | /* No discipline for device found. */ | |
665 | dasd_set_target_state(device, DASD_STATE_NEW); | |
666 | /* Now wait for the devices to come up. */ | |
667 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
25e2cf1c SH |
668 | |
669 | dasd_reload_device(device); | |
670 | if (device->discipline->kick_validate) | |
671 | device->discipline->kick_validate(device); | |
1da177e4 | 672 | } |
7048a2b5 | 673 | EXPORT_SYMBOL(dasd_enable_device); |
1da177e4 LT |
674 | |
675 | /* | |
676 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
677 | */ | |
1da177e4 | 678 | |
4fa52aa7 | 679 | unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; |
1da177e4 | 680 | |
4fa52aa7 | 681 | #ifdef CONFIG_DASD_PROFILE |
8ea55c95 | 682 | struct dasd_profile dasd_global_profile = { |
8ea55c95 SO |
683 | .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock), |
684 | }; | |
4fa52aa7 | 685 | static struct dentry *dasd_debugfs_global_entry; |
1da177e4 LT |
686 | |
687 | /* | |
688 | * Add profiling information for cqr before execution. | |
689 | */ | |
8e09f215 SW |
690 | static void dasd_profile_start(struct dasd_block *block, |
691 | struct dasd_ccw_req *cqr, | |
692 | struct request *req) | |
1da177e4 LT |
693 | { |
694 | struct list_head *l; | |
695 | unsigned int counter; | |
4fa52aa7 | 696 | struct dasd_device *device; |
1da177e4 LT |
697 | |
698 | /* count the length of the chanq for statistics */ | |
699 | counter = 0; | |
4fa52aa7 SW |
700 | if (dasd_global_profile_level || block->profile.data) |
701 | list_for_each(l, &block->ccw_queue) | |
702 | if (++counter >= 31) | |
703 | break; | |
704 | ||
8ea55c95 | 705 | spin_lock(&dasd_global_profile.lock); |
6765cc2a | 706 | if (dasd_global_profile.data) { |
8ea55c95 | 707 | dasd_global_profile.data->dasd_io_nr_req[counter]++; |
4fa52aa7 | 708 | if (rq_data_dir(req) == READ) |
8ea55c95 | 709 | dasd_global_profile.data->dasd_read_nr_req[counter]++; |
4fa52aa7 | 710 | } |
8ea55c95 | 711 | spin_unlock(&dasd_global_profile.lock); |
4fa52aa7 SW |
712 | |
713 | spin_lock(&block->profile.lock); | |
c81a90c8 | 714 | if (block->profile.data) { |
4fa52aa7 SW |
715 | block->profile.data->dasd_io_nr_req[counter]++; |
716 | if (rq_data_dir(req) == READ) | |
717 | block->profile.data->dasd_read_nr_req[counter]++; | |
c81a90c8 | 718 | } |
4fa52aa7 SW |
719 | spin_unlock(&block->profile.lock); |
720 | ||
721 | /* | |
722 | * We count the request for the start device, even though it may run on | |
723 | * some other device due to error recovery. This way we make sure that | |
724 | * we count each request only once. | |
725 | */ | |
726 | device = cqr->startdev; | |
727 | if (device->profile.data) { | |
728 | counter = 1; /* request is not yet queued on the start device */ | |
729 | list_for_each(l, &device->ccw_queue) | |
730 | if (++counter >= 31) | |
731 | break; | |
732 | } | |
733 | spin_lock(&device->profile.lock); | |
734 | if (device->profile.data) { | |
735 | device->profile.data->dasd_io_nr_req[counter]++; | |
736 | if (rq_data_dir(req) == READ) | |
737 | device->profile.data->dasd_read_nr_req[counter]++; | |
738 | } | |
739 | spin_unlock(&device->profile.lock); | |
1da177e4 LT |
740 | } |
741 | ||
742 | /* | |
743 | * Add profiling information for cqr after execution. | |
744 | */ | |
4fa52aa7 SW |
745 | |
746 | #define dasd_profile_counter(value, index) \ | |
747 | { \ | |
748 | for (index = 0; index < 31 && value >> (2+index); index++) \ | |
749 | ; \ | |
750 | } | |
751 | ||
752 | static void dasd_profile_end_add_data(struct dasd_profile_info *data, | |
753 | int is_alias, | |
754 | int is_tpm, | |
755 | int is_read, | |
756 | long sectors, | |
757 | int sectors_ind, | |
758 | int tottime_ind, | |
759 | int tottimeps_ind, | |
760 | int strtime_ind, | |
761 | int irqtime_ind, | |
762 | int irqtimeps_ind, | |
763 | int endtime_ind) | |
764 | { | |
765 | /* in case of an overflow, reset the whole profile */ | |
766 | if (data->dasd_io_reqs == UINT_MAX) { | |
767 | memset(data, 0, sizeof(*data)); | |
768 | getnstimeofday(&data->starttod); | |
769 | } | |
770 | data->dasd_io_reqs++; | |
771 | data->dasd_io_sects += sectors; | |
772 | if (is_alias) | |
773 | data->dasd_io_alias++; | |
774 | if (is_tpm) | |
775 | data->dasd_io_tpm++; | |
776 | ||
777 | data->dasd_io_secs[sectors_ind]++; | |
778 | data->dasd_io_times[tottime_ind]++; | |
779 | data->dasd_io_timps[tottimeps_ind]++; | |
780 | data->dasd_io_time1[strtime_ind]++; | |
781 | data->dasd_io_time2[irqtime_ind]++; | |
782 | data->dasd_io_time2ps[irqtimeps_ind]++; | |
783 | data->dasd_io_time3[endtime_ind]++; | |
784 | ||
785 | if (is_read) { | |
786 | data->dasd_read_reqs++; | |
787 | data->dasd_read_sects += sectors; | |
788 | if (is_alias) | |
789 | data->dasd_read_alias++; | |
790 | if (is_tpm) | |
791 | data->dasd_read_tpm++; | |
792 | data->dasd_read_secs[sectors_ind]++; | |
793 | data->dasd_read_times[tottime_ind]++; | |
794 | data->dasd_read_time1[strtime_ind]++; | |
795 | data->dasd_read_time2[irqtime_ind]++; | |
796 | data->dasd_read_time3[endtime_ind]++; | |
797 | } | |
798 | } | |
799 | ||
8e09f215 SW |
800 | static void dasd_profile_end(struct dasd_block *block, |
801 | struct dasd_ccw_req *cqr, | |
802 | struct request *req) | |
1da177e4 LT |
803 | { |
804 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
805 | long tottimeps, sectors; | |
4fa52aa7 SW |
806 | struct dasd_device *device; |
807 | int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; | |
808 | int irqtime_ind, irqtimeps_ind, endtime_ind; | |
1da177e4 | 809 | |
4fa52aa7 SW |
810 | device = cqr->startdev; |
811 | if (!(dasd_global_profile_level || | |
812 | block->profile.data || | |
813 | device->profile.data)) | |
1da177e4 LT |
814 | return; |
815 | ||
83096ebf | 816 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
817 | if (!cqr->buildclk || !cqr->startclk || |
818 | !cqr->stopclk || !cqr->endclk || | |
819 | !sectors) | |
820 | return; | |
821 | ||
822 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
823 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
824 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
825 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
826 | tottimeps = tottime / sectors; | |
827 | ||
4fa52aa7 SW |
828 | dasd_profile_counter(sectors, sectors_ind); |
829 | dasd_profile_counter(tottime, tottime_ind); | |
830 | dasd_profile_counter(tottimeps, tottimeps_ind); | |
831 | dasd_profile_counter(strtime, strtime_ind); | |
832 | dasd_profile_counter(irqtime, irqtime_ind); | |
833 | dasd_profile_counter(irqtime / sectors, irqtimeps_ind); | |
834 | dasd_profile_counter(endtime, endtime_ind); | |
835 | ||
8ea55c95 | 836 | spin_lock(&dasd_global_profile.lock); |
6765cc2a | 837 | if (dasd_global_profile.data) { |
8ea55c95 | 838 | dasd_profile_end_add_data(dasd_global_profile.data, |
4fa52aa7 SW |
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 | } | |
8ea55c95 | 847 | spin_unlock(&dasd_global_profile.lock); |
4fa52aa7 SW |
848 | |
849 | spin_lock(&block->profile.lock); | |
850 | if (block->profile.data) | |
851 | dasd_profile_end_add_data(block->profile.data, | |
852 | cqr->startdev != block->base, | |
853 | cqr->cpmode == 1, | |
854 | rq_data_dir(req) == READ, | |
855 | sectors, sectors_ind, tottime_ind, | |
856 | tottimeps_ind, strtime_ind, | |
857 | irqtime_ind, irqtimeps_ind, | |
858 | endtime_ind); | |
859 | spin_unlock(&block->profile.lock); | |
860 | ||
861 | spin_lock(&device->profile.lock); | |
862 | if (device->profile.data) | |
863 | dasd_profile_end_add_data(device->profile.data, | |
864 | cqr->startdev != block->base, | |
865 | cqr->cpmode == 1, | |
866 | rq_data_dir(req) == READ, | |
867 | sectors, sectors_ind, tottime_ind, | |
868 | tottimeps_ind, strtime_ind, | |
869 | irqtime_ind, irqtimeps_ind, | |
870 | endtime_ind); | |
871 | spin_unlock(&device->profile.lock); | |
872 | } | |
873 | ||
874 | void dasd_profile_reset(struct dasd_profile *profile) | |
875 | { | |
876 | struct dasd_profile_info *data; | |
877 | ||
878 | spin_lock_bh(&profile->lock); | |
879 | data = profile->data; | |
880 | if (!data) { | |
881 | spin_unlock_bh(&profile->lock); | |
882 | return; | |
883 | } | |
884 | memset(data, 0, sizeof(*data)); | |
885 | getnstimeofday(&data->starttod); | |
886 | spin_unlock_bh(&profile->lock); | |
887 | } | |
888 | ||
4fa52aa7 SW |
889 | int dasd_profile_on(struct dasd_profile *profile) |
890 | { | |
891 | struct dasd_profile_info *data; | |
892 | ||
893 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
894 | if (!data) | |
895 | return -ENOMEM; | |
896 | spin_lock_bh(&profile->lock); | |
897 | if (profile->data) { | |
898 | spin_unlock_bh(&profile->lock); | |
899 | kfree(data); | |
900 | return 0; | |
901 | } | |
902 | getnstimeofday(&data->starttod); | |
903 | profile->data = data; | |
904 | spin_unlock_bh(&profile->lock); | |
905 | return 0; | |
906 | } | |
907 | ||
908 | void dasd_profile_off(struct dasd_profile *profile) | |
909 | { | |
910 | spin_lock_bh(&profile->lock); | |
911 | kfree(profile->data); | |
912 | profile->data = NULL; | |
913 | spin_unlock_bh(&profile->lock); | |
914 | } | |
915 | ||
916 | char *dasd_get_user_string(const char __user *user_buf, size_t user_len) | |
917 | { | |
918 | char *buffer; | |
919 | ||
e4258d55 | 920 | buffer = vmalloc(user_len + 1); |
4fa52aa7 SW |
921 | if (buffer == NULL) |
922 | return ERR_PTR(-ENOMEM); | |
923 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
e4258d55 | 924 | vfree(buffer); |
4fa52aa7 SW |
925 | return ERR_PTR(-EFAULT); |
926 | } | |
927 | /* got the string, now strip linefeed. */ | |
928 | if (buffer[user_len - 1] == '\n') | |
929 | buffer[user_len - 1] = 0; | |
930 | else | |
931 | buffer[user_len] = 0; | |
932 | return buffer; | |
1da177e4 | 933 | } |
4fa52aa7 SW |
934 | |
935 | static ssize_t dasd_stats_write(struct file *file, | |
936 | const char __user *user_buf, | |
937 | size_t user_len, loff_t *pos) | |
938 | { | |
939 | char *buffer, *str; | |
940 | int rc; | |
941 | struct seq_file *m = (struct seq_file *)file->private_data; | |
942 | struct dasd_profile *prof = m->private; | |
943 | ||
944 | if (user_len > 65536) | |
945 | user_len = 65536; | |
946 | buffer = dasd_get_user_string(user_buf, user_len); | |
947 | if (IS_ERR(buffer)) | |
948 | return PTR_ERR(buffer); | |
949 | ||
950 | str = skip_spaces(buffer); | |
951 | rc = user_len; | |
952 | if (strncmp(str, "reset", 5) == 0) { | |
953 | dasd_profile_reset(prof); | |
954 | } else if (strncmp(str, "on", 2) == 0) { | |
955 | rc = dasd_profile_on(prof); | |
6765cc2a SO |
956 | if (rc) |
957 | goto out; | |
958 | rc = user_len; | |
959 | if (prof == &dasd_global_profile) { | |
960 | dasd_profile_reset(prof); | |
961 | dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; | |
962 | } | |
4fa52aa7 | 963 | } else if (strncmp(str, "off", 3) == 0) { |
6765cc2a SO |
964 | if (prof == &dasd_global_profile) |
965 | dasd_global_profile_level = DASD_PROFILE_OFF; | |
4fa52aa7 SW |
966 | dasd_profile_off(prof); |
967 | } else | |
968 | rc = -EINVAL; | |
6765cc2a | 969 | out: |
e4258d55 | 970 | vfree(buffer); |
4fa52aa7 SW |
971 | return rc; |
972 | } | |
973 | ||
974 | static void dasd_stats_array(struct seq_file *m, unsigned int *array) | |
975 | { | |
976 | int i; | |
977 | ||
978 | for (i = 0; i < 32; i++) | |
979 | seq_printf(m, "%u ", array[i]); | |
980 | seq_putc(m, '\n'); | |
981 | } | |
982 | ||
983 | static void dasd_stats_seq_print(struct seq_file *m, | |
984 | struct dasd_profile_info *data) | |
985 | { | |
986 | seq_printf(m, "start_time %ld.%09ld\n", | |
987 | data->starttod.tv_sec, data->starttod.tv_nsec); | |
988 | seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); | |
989 | seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); | |
990 | seq_printf(m, "total_pav %u\n", data->dasd_io_alias); | |
991 | seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); | |
c794caf9 | 992 | seq_puts(m, "histogram_sectors "); |
4fa52aa7 | 993 | dasd_stats_array(m, data->dasd_io_secs); |
c794caf9 | 994 | seq_puts(m, "histogram_io_times "); |
4fa52aa7 | 995 | dasd_stats_array(m, data->dasd_io_times); |
c794caf9 | 996 | seq_puts(m, "histogram_io_times_weighted "); |
4fa52aa7 | 997 | dasd_stats_array(m, data->dasd_io_timps); |
c794caf9 | 998 | seq_puts(m, "histogram_time_build_to_ssch "); |
4fa52aa7 | 999 | dasd_stats_array(m, data->dasd_io_time1); |
c794caf9 | 1000 | seq_puts(m, "histogram_time_ssch_to_irq "); |
4fa52aa7 | 1001 | dasd_stats_array(m, data->dasd_io_time2); |
c794caf9 | 1002 | seq_puts(m, "histogram_time_ssch_to_irq_weighted "); |
4fa52aa7 | 1003 | dasd_stats_array(m, data->dasd_io_time2ps); |
c794caf9 | 1004 | seq_puts(m, "histogram_time_irq_to_end "); |
4fa52aa7 | 1005 | dasd_stats_array(m, data->dasd_io_time3); |
c794caf9 | 1006 | seq_puts(m, "histogram_ccw_queue_length "); |
4fa52aa7 SW |
1007 | dasd_stats_array(m, data->dasd_io_nr_req); |
1008 | seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); | |
1009 | seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); | |
1010 | seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); | |
1011 | seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); | |
c794caf9 | 1012 | seq_puts(m, "histogram_read_sectors "); |
4fa52aa7 | 1013 | dasd_stats_array(m, data->dasd_read_secs); |
c794caf9 | 1014 | seq_puts(m, "histogram_read_times "); |
4fa52aa7 | 1015 | dasd_stats_array(m, data->dasd_read_times); |
c794caf9 | 1016 | seq_puts(m, "histogram_read_time_build_to_ssch "); |
4fa52aa7 | 1017 | dasd_stats_array(m, data->dasd_read_time1); |
c794caf9 | 1018 | seq_puts(m, "histogram_read_time_ssch_to_irq "); |
4fa52aa7 | 1019 | dasd_stats_array(m, data->dasd_read_time2); |
c794caf9 | 1020 | seq_puts(m, "histogram_read_time_irq_to_end "); |
4fa52aa7 | 1021 | dasd_stats_array(m, data->dasd_read_time3); |
c794caf9 | 1022 | seq_puts(m, "histogram_read_ccw_queue_length "); |
4fa52aa7 SW |
1023 | dasd_stats_array(m, data->dasd_read_nr_req); |
1024 | } | |
1025 | ||
1026 | static int dasd_stats_show(struct seq_file *m, void *v) | |
1027 | { | |
1028 | struct dasd_profile *profile; | |
1029 | struct dasd_profile_info *data; | |
1030 | ||
1031 | profile = m->private; | |
1032 | spin_lock_bh(&profile->lock); | |
1033 | data = profile->data; | |
1034 | if (!data) { | |
1035 | spin_unlock_bh(&profile->lock); | |
c794caf9 | 1036 | seq_puts(m, "disabled\n"); |
4fa52aa7 SW |
1037 | return 0; |
1038 | } | |
1039 | dasd_stats_seq_print(m, data); | |
1040 | spin_unlock_bh(&profile->lock); | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static int dasd_stats_open(struct inode *inode, struct file *file) | |
1045 | { | |
1046 | struct dasd_profile *profile = inode->i_private; | |
1047 | return single_open(file, dasd_stats_show, profile); | |
1048 | } | |
1049 | ||
1050 | static const struct file_operations dasd_stats_raw_fops = { | |
1051 | .owner = THIS_MODULE, | |
1052 | .open = dasd_stats_open, | |
1053 | .read = seq_read, | |
1054 | .llseek = seq_lseek, | |
1055 | .release = single_release, | |
1056 | .write = dasd_stats_write, | |
1057 | }; | |
1058 | ||
4fa52aa7 SW |
1059 | static void dasd_profile_init(struct dasd_profile *profile, |
1060 | struct dentry *base_dentry) | |
1061 | { | |
f4ae40a6 | 1062 | umode_t mode; |
4fa52aa7 SW |
1063 | struct dentry *pde; |
1064 | ||
1065 | if (!base_dentry) | |
1066 | return; | |
1067 | profile->dentry = NULL; | |
1068 | profile->data = NULL; | |
1069 | mode = (S_IRUSR | S_IWUSR | S_IFREG); | |
1070 | pde = debugfs_create_file("statistics", mode, base_dentry, | |
1071 | profile, &dasd_stats_raw_fops); | |
1072 | if (pde && !IS_ERR(pde)) | |
1073 | profile->dentry = pde; | |
1074 | return; | |
1075 | } | |
1076 | ||
1077 | static void dasd_profile_exit(struct dasd_profile *profile) | |
1078 | { | |
1079 | dasd_profile_off(profile); | |
d7309aaa FF |
1080 | debugfs_remove(profile->dentry); |
1081 | profile->dentry = NULL; | |
4fa52aa7 SW |
1082 | } |
1083 | ||
1084 | static void dasd_statistics_removeroot(void) | |
1085 | { | |
1086 | dasd_global_profile_level = DASD_PROFILE_OFF; | |
6765cc2a | 1087 | dasd_profile_exit(&dasd_global_profile); |
d7309aaa FF |
1088 | debugfs_remove(dasd_debugfs_global_entry); |
1089 | debugfs_remove(dasd_debugfs_root_entry); | |
4fa52aa7 SW |
1090 | } |
1091 | ||
1092 | static void dasd_statistics_createroot(void) | |
1093 | { | |
4fa52aa7 SW |
1094 | struct dentry *pde; |
1095 | ||
1096 | dasd_debugfs_root_entry = NULL; | |
4fa52aa7 SW |
1097 | pde = debugfs_create_dir("dasd", NULL); |
1098 | if (!pde || IS_ERR(pde)) | |
1099 | goto error; | |
1100 | dasd_debugfs_root_entry = pde; | |
1101 | pde = debugfs_create_dir("global", dasd_debugfs_root_entry); | |
1102 | if (!pde || IS_ERR(pde)) | |
1103 | goto error; | |
1104 | dasd_debugfs_global_entry = pde; | |
6765cc2a | 1105 | dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry); |
4fa52aa7 SW |
1106 | return; |
1107 | ||
1108 | error: | |
1109 | DBF_EVENT(DBF_ERR, "%s", | |
1110 | "Creation of the dasd debugfs interface failed"); | |
1111 | dasd_statistics_removeroot(); | |
1112 | return; | |
1113 | } | |
1114 | ||
1da177e4 | 1115 | #else |
8e09f215 SW |
1116 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
1117 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
4fa52aa7 SW |
1118 | |
1119 | static void dasd_statistics_createroot(void) | |
1120 | { | |
1121 | return; | |
1122 | } | |
1123 | ||
1124 | static void dasd_statistics_removeroot(void) | |
1125 | { | |
1126 | return; | |
1127 | } | |
1128 | ||
1129 | int dasd_stats_generic_show(struct seq_file *m, void *v) | |
1130 | { | |
c794caf9 | 1131 | seq_puts(m, "Statistics are not activated in this kernel\n"); |
4fa52aa7 SW |
1132 | return 0; |
1133 | } | |
1134 | ||
1135 | static void dasd_profile_init(struct dasd_profile *profile, | |
1136 | struct dentry *base_dentry) | |
1137 | { | |
1138 | return; | |
1139 | } | |
1140 | ||
1141 | static void dasd_profile_exit(struct dasd_profile *profile) | |
1142 | { | |
1143 | return; | |
1144 | } | |
1145 | ||
1146 | int dasd_profile_on(struct dasd_profile *profile) | |
1147 | { | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1da177e4 LT |
1151 | #endif /* CONFIG_DASD_PROFILE */ |
1152 | ||
5a3b7b11 SH |
1153 | static int dasd_hosts_show(struct seq_file *m, void *v) |
1154 | { | |
1155 | struct dasd_device *device; | |
1156 | int rc = -EOPNOTSUPP; | |
1157 | ||
1158 | device = m->private; | |
1159 | dasd_get_device(device); | |
1160 | ||
1161 | if (device->discipline->hosts_print) | |
1162 | rc = device->discipline->hosts_print(device, m); | |
1163 | ||
1164 | dasd_put_device(device); | |
1165 | return rc; | |
1166 | } | |
1167 | ||
1168 | static int dasd_hosts_open(struct inode *inode, struct file *file) | |
1169 | { | |
1170 | struct dasd_device *device = inode->i_private; | |
1171 | ||
1172 | return single_open(file, dasd_hosts_show, device); | |
1173 | } | |
1174 | ||
1175 | static const struct file_operations dasd_hosts_fops = { | |
1176 | .owner = THIS_MODULE, | |
1177 | .open = dasd_hosts_open, | |
1178 | .read = seq_read, | |
1179 | .llseek = seq_lseek, | |
1180 | .release = single_release, | |
1181 | }; | |
1182 | ||
1183 | static void dasd_hosts_exit(struct dasd_device *device) | |
1184 | { | |
1185 | debugfs_remove(device->hosts_dentry); | |
1186 | device->hosts_dentry = NULL; | |
1187 | } | |
1188 | ||
1189 | static void dasd_hosts_init(struct dentry *base_dentry, | |
1190 | struct dasd_device *device) | |
1191 | { | |
1192 | struct dentry *pde; | |
1193 | umode_t mode; | |
1194 | ||
1195 | if (!base_dentry) | |
1196 | return; | |
1197 | ||
1198 | mode = S_IRUSR | S_IFREG; | |
1199 | pde = debugfs_create_file("host_access_list", mode, base_dentry, | |
1200 | device, &dasd_hosts_fops); | |
1201 | if (pde && !IS_ERR(pde)) | |
1202 | device->hosts_dentry = pde; | |
1203 | } | |
1204 | ||
1da177e4 LT |
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 | } | |
7048a2b5 | 1248 | EXPORT_SYMBOL(dasd_kmalloc_request); |
1da177e4 | 1249 | |
68b781fe | 1250 | struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
8e09f215 SW |
1251 | int datasize, |
1252 | struct dasd_device *device) | |
1da177e4 LT |
1253 | { |
1254 | unsigned long flags; | |
1255 | struct dasd_ccw_req *cqr; | |
1256 | char *data; | |
1257 | int size; | |
1258 | ||
1da177e4 LT |
1259 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; |
1260 | if (cplength > 0) | |
1261 | size += cplength * sizeof(struct ccw1); | |
1262 | if (datasize > 0) | |
1263 | size += datasize; | |
1264 | spin_lock_irqsave(&device->mem_lock, flags); | |
1265 | cqr = (struct dasd_ccw_req *) | |
1266 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
1267 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
1268 | if (cqr == NULL) | |
1269 | return ERR_PTR(-ENOMEM); | |
1270 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
1271 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
1272 | cqr->cpaddr = NULL; | |
1273 | if (cplength > 0) { | |
1274 | cqr->cpaddr = (struct ccw1 *) data; | |
1275 | data += cplength*sizeof(struct ccw1); | |
1276 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
1277 | } | |
1278 | cqr->data = NULL; | |
1279 | if (datasize > 0) { | |
1280 | cqr->data = data; | |
1281 | memset(cqr->data, 0, datasize); | |
1282 | } | |
68b781fe | 1283 | cqr->magic = magic; |
1da177e4 LT |
1284 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
1285 | dasd_get_device(device); | |
1286 | return cqr; | |
1287 | } | |
7048a2b5 | 1288 | EXPORT_SYMBOL(dasd_smalloc_request); |
1da177e4 LT |
1289 | |
1290 | /* | |
1291 | * Free memory of a channel program. This function needs to free all the | |
1292 | * idal lists that might have been created by dasd_set_cda and the | |
1293 | * struct dasd_ccw_req itself. | |
1294 | */ | |
8e09f215 | 1295 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 1296 | { |
1da177e4 LT |
1297 | struct ccw1 *ccw; |
1298 | ||
1299 | /* Clear any idals used for the request. */ | |
1300 | ccw = cqr->cpaddr; | |
1301 | do { | |
1302 | clear_normalized_cda(ccw); | |
1303 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
17fd682e JJ |
1304 | kfree(cqr->cpaddr); |
1305 | kfree(cqr->data); | |
1da177e4 LT |
1306 | kfree(cqr); |
1307 | dasd_put_device(device); | |
1308 | } | |
7048a2b5 | 1309 | EXPORT_SYMBOL(dasd_kfree_request); |
1da177e4 | 1310 | |
8e09f215 | 1311 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
1312 | { |
1313 | unsigned long flags; | |
1314 | ||
1315 | spin_lock_irqsave(&device->mem_lock, flags); | |
1316 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
1317 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
1318 | dasd_put_device(device); | |
1319 | } | |
7048a2b5 | 1320 | EXPORT_SYMBOL(dasd_sfree_request); |
1da177e4 LT |
1321 | |
1322 | /* | |
1323 | * Check discipline magic in cqr. | |
1324 | */ | |
8e09f215 | 1325 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1326 | { |
1327 | struct dasd_device *device; | |
1328 | ||
1329 | if (cqr == NULL) | |
1330 | return -EINVAL; | |
8e09f215 | 1331 | device = cqr->startdev; |
1da177e4 | 1332 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 1333 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
1334 | " dasd_ccw_req 0x%08x magic doesn't match" |
1335 | " discipline 0x%08x", | |
1336 | cqr->magic, | |
1337 | *(unsigned int *) device->discipline->name); | |
1338 | return -EINVAL; | |
1339 | } | |
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * Terminate the current i/o and set the request to clear_pending. | |
1345 | * Timer keeps device runnig. | |
1346 | * ccw_device_clear can fail if the i/o subsystem | |
1347 | * is in a bad mood. | |
1348 | */ | |
8e09f215 | 1349 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1350 | { |
1351 | struct dasd_device *device; | |
1352 | int retries, rc; | |
fc19f381 | 1353 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
1354 | |
1355 | /* Check the cqr */ | |
1356 | rc = dasd_check_cqr(cqr); | |
1357 | if (rc) | |
1358 | return rc; | |
1359 | retries = 0; | |
8e09f215 | 1360 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
1361 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
1362 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
1363 | switch (rc) { | |
1364 | case 0: /* termination successful */ | |
8e09f215 | 1365 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1aae0560 | 1366 | cqr->stopclk = get_tod_clock(); |
8f61701b | 1367 | cqr->starttime = 0; |
1da177e4 LT |
1368 | DBF_DEV_EVENT(DBF_DEBUG, device, |
1369 | "terminate cqr %p successful", | |
1370 | cqr); | |
1371 | break; | |
1372 | case -ENODEV: | |
1373 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1374 | "device gone, retry"); | |
1375 | break; | |
1376 | case -EIO: | |
1377 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1378 | "I/O error, retry"); | |
1379 | break; | |
1380 | case -EINVAL: | |
2c17124b SH |
1381 | /* |
1382 | * device not valid so no I/O could be running | |
1383 | * handle CQR as termination successful | |
1384 | */ | |
1385 | cqr->status = DASD_CQR_CLEARED; | |
1386 | cqr->stopclk = get_tod_clock(); | |
1387 | cqr->starttime = 0; | |
1388 | /* no retries for invalid devices */ | |
1389 | cqr->retries = -1; | |
1390 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1391 | "EINVAL, handle as terminated"); | |
1392 | /* fake rc to success */ | |
1393 | rc = 0; | |
1394 | break; | |
1da177e4 LT |
1395 | case -EBUSY: |
1396 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1397 | "device busy, retry later"); | |
1398 | break; | |
1399 | default: | |
fc19f381 SH |
1400 | /* internal error 10 - unknown rc*/ |
1401 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
1402 | dev_err(&device->cdev->dev, "An error occurred in the " | |
1403 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
1404 | BUG(); |
1405 | break; | |
1406 | } | |
1407 | retries++; | |
1408 | } | |
8e09f215 | 1409 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1410 | return rc; |
1411 | } | |
7048a2b5 | 1412 | EXPORT_SYMBOL(dasd_term_IO); |
1da177e4 LT |
1413 | |
1414 | /* | |
1415 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
1416 | * In that case set up a timer to start the request later. | |
1417 | */ | |
8e09f215 | 1418 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1419 | { |
1420 | struct dasd_device *device; | |
1421 | int rc; | |
fc19f381 | 1422 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
1423 | |
1424 | /* Check the cqr */ | |
1425 | rc = dasd_check_cqr(cqr); | |
6cc7f168 SW |
1426 | if (rc) { |
1427 | cqr->intrc = rc; | |
1da177e4 | 1428 | return rc; |
6cc7f168 | 1429 | } |
8e09f215 | 1430 | device = (struct dasd_device *) cqr->startdev; |
5a27e60d SW |
1431 | if (((cqr->block && |
1432 | test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || | |
1433 | test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && | |
1434 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
1435 | DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " | |
1436 | "because of stolen lock", cqr); | |
1437 | cqr->status = DASD_CQR_ERROR; | |
1438 | cqr->intrc = -EPERM; | |
1439 | return -EPERM; | |
1440 | } | |
1da177e4 | 1441 | if (cqr->retries < 0) { |
fc19f381 SH |
1442 | /* internal error 14 - start_IO run out of retries */ |
1443 | sprintf(errorstring, "14 %p", cqr); | |
1444 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
1445 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 1446 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
1447 | return -EIO; |
1448 | } | |
1aae0560 | 1449 | cqr->startclk = get_tod_clock(); |
1da177e4 LT |
1450 | cqr->starttime = jiffies; |
1451 | cqr->retries--; | |
a4d26c6a | 1452 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
c9346151 | 1453 | cqr->lpm &= dasd_path_get_opm(device); |
a4d26c6a | 1454 | if (!cqr->lpm) |
c9346151 | 1455 | cqr->lpm = dasd_path_get_opm(device); |
a4d26c6a | 1456 | } |
f3eb5384 SW |
1457 | if (cqr->cpmode == 1) { |
1458 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
1459 | (long) cqr, cqr->lpm); | |
1460 | } else { | |
1461 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
1462 | (long) cqr, cqr->lpm, 0); | |
1463 | } | |
1da177e4 LT |
1464 | switch (rc) { |
1465 | case 0: | |
1466 | cqr->status = DASD_CQR_IN_IO; | |
1da177e4 LT |
1467 | break; |
1468 | case -EBUSY: | |
a4d26c6a | 1469 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
1470 | "start_IO: device busy, retry later"); |
1471 | break; | |
1472 | case -ETIMEDOUT: | |
a4d26c6a | 1473 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
1474 | "start_IO: request timeout, retry later"); |
1475 | break; | |
1476 | case -EACCES: | |
a4d26c6a SW |
1477 | /* -EACCES indicates that the request used only a subset of the |
1478 | * available paths and all these paths are gone. If the lpm of | |
1479 | * this request was only a subset of the opm (e.g. the ppm) then | |
1480 | * we just do a retry with all available paths. | |
1481 | * If we already use the full opm, something is amiss, and we | |
1482 | * need a full path verification. | |
1da177e4 | 1483 | */ |
a4d26c6a SW |
1484 | if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
1485 | DBF_DEV_EVENT(DBF_WARNING, device, | |
1486 | "start_IO: selected paths gone (%x)", | |
1487 | cqr->lpm); | |
c9346151 SH |
1488 | } else if (cqr->lpm != dasd_path_get_opm(device)) { |
1489 | cqr->lpm = dasd_path_get_opm(device); | |
a4d26c6a SW |
1490 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1491 | "start_IO: selected paths gone," | |
1492 | " retry on all paths"); | |
1493 | } else { | |
1494 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", | |
1495 | "start_IO: all paths in opm gone," | |
1496 | " do path verification"); | |
1497 | dasd_generic_last_path_gone(device); | |
c9346151 SH |
1498 | dasd_path_no_path(device); |
1499 | dasd_path_set_tbvpm(device, | |
1500 | ccw_device_get_path_mask( | |
1501 | device->cdev)); | |
a4d26c6a | 1502 | } |
1da177e4 LT |
1503 | break; |
1504 | case -ENODEV: | |
a4d26c6a | 1505 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
f3eb5384 SW |
1506 | "start_IO: -ENODEV device gone, retry"); |
1507 | break; | |
1da177e4 | 1508 | case -EIO: |
a4d26c6a | 1509 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
f3eb5384 | 1510 | "start_IO: -EIO device gone, retry"); |
1da177e4 | 1511 | break; |
d41dd122 SH |
1512 | case -EINVAL: |
1513 | /* most likely caused in power management context */ | |
a4d26c6a | 1514 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
d41dd122 SH |
1515 | "start_IO: -EINVAL device currently " |
1516 | "not accessible"); | |
1517 | break; | |
1da177e4 | 1518 | default: |
fc19f381 SH |
1519 | /* internal error 11 - unknown rc */ |
1520 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
1521 | dev_err(&device->cdev->dev, | |
1522 | "An error occurred in the DASD device driver, " | |
1523 | "reason=%s\n", errorstring); | |
1da177e4 LT |
1524 | BUG(); |
1525 | break; | |
1526 | } | |
6cc7f168 | 1527 | cqr->intrc = rc; |
1da177e4 LT |
1528 | return rc; |
1529 | } | |
7048a2b5 | 1530 | EXPORT_SYMBOL(dasd_start_IO); |
1da177e4 LT |
1531 | |
1532 | /* | |
1533 | * Timeout function for dasd devices. This is used for different purposes | |
1534 | * 1) missing interrupt handler for normal operation | |
1535 | * 2) delayed start of request where start_IO failed with -EBUSY | |
1536 | * 3) timeout for missing state change interrupts | |
1537 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
1538 | * DASD_CQR_QUEUED for 2) and 3). | |
1539 | */ | |
8e09f215 | 1540 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
1541 | { |
1542 | unsigned long flags; | |
1543 | struct dasd_device *device; | |
1544 | ||
1545 | device = (struct dasd_device *) ptr; | |
1546 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1547 | /* re-activate request queue */ | |
eb6e199b | 1548 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
1da177e4 | 1549 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
8e09f215 | 1550 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1551 | } |
1552 | ||
1553 | /* | |
1554 | * Setup timeout for a device in jiffies. | |
1555 | */ | |
8e09f215 | 1556 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 1557 | { |
48cae885 SW |
1558 | if (expires == 0) |
1559 | del_timer(&device->timer); | |
1560 | else | |
1561 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 | 1562 | } |
7048a2b5 | 1563 | EXPORT_SYMBOL(dasd_device_set_timer); |
1da177e4 LT |
1564 | |
1565 | /* | |
1566 | * Clear timeout for a device. | |
1567 | */ | |
8e09f215 | 1568 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 1569 | { |
48cae885 | 1570 | del_timer(&device->timer); |
1da177e4 | 1571 | } |
7048a2b5 | 1572 | EXPORT_SYMBOL(dasd_device_clear_timer); |
1da177e4 | 1573 | |
8e09f215 SW |
1574 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
1575 | unsigned long intparm) | |
1da177e4 LT |
1576 | { |
1577 | struct dasd_ccw_req *cqr; | |
1578 | struct dasd_device *device; | |
1579 | ||
f16f5843 SW |
1580 | if (!intparm) |
1581 | return; | |
1da177e4 LT |
1582 | cqr = (struct dasd_ccw_req *) intparm; |
1583 | if (cqr->status != DASD_CQR_IN_IO) { | |
b8ed5dd5 SH |
1584 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, |
1585 | "invalid status in handle_killed_request: " | |
1586 | "%02x", cqr->status); | |
1da177e4 LT |
1587 | return; |
1588 | } | |
1589 | ||
589c74d5 SH |
1590 | device = dasd_device_from_cdev_locked(cdev); |
1591 | if (IS_ERR(device)) { | |
1592 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", | |
1593 | "unable to get device from cdev"); | |
1594 | return; | |
1595 | } | |
1596 | ||
1597 | if (!cqr->startdev || | |
1598 | device != cqr->startdev || | |
1599 | strncmp(cqr->startdev->discipline->ebcname, | |
1600 | (char *) &cqr->magic, 4)) { | |
294001a8 SH |
1601 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1602 | "invalid device in request"); | |
589c74d5 | 1603 | dasd_put_device(device); |
1da177e4 LT |
1604 | return; |
1605 | } | |
1606 | ||
1607 | /* Schedule request to be retried. */ | |
1608 | cqr->status = DASD_CQR_QUEUED; | |
1609 | ||
8e09f215 SW |
1610 | dasd_device_clear_timer(device); |
1611 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1612 | dasd_put_device(device); |
1613 | } | |
1614 | ||
8e09f215 | 1615 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 1616 | { |
20c64468 SW |
1617 | /* First of all start sense subsystem status request. */ |
1618 | dasd_eer_snss(device); | |
1619 | ||
eb6e199b | 1620 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
8e09f215 SW |
1621 | dasd_schedule_device_bh(device); |
1622 | if (device->block) | |
1623 | dasd_schedule_block_bh(device->block); | |
1da177e4 | 1624 | } |
7048a2b5 | 1625 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
1da177e4 | 1626 | |
a521b048 SH |
1627 | static int dasd_check_hpf_error(struct irb *irb) |
1628 | { | |
1629 | return (scsw_tm_is_valid_schxs(&irb->scsw) && | |
1630 | (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX || | |
1631 | irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX)); | |
1632 | } | |
1633 | ||
1da177e4 LT |
1634 | /* |
1635 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1636 | */ | |
8e09f215 SW |
1637 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1638 | struct irb *irb) | |
1da177e4 LT |
1639 | { |
1640 | struct dasd_ccw_req *cqr, *next; | |
1641 | struct dasd_device *device; | |
1642 | unsigned long long now; | |
8fd57520 JH |
1643 | int nrf_suppressed = 0; |
1644 | int fp_suppressed = 0; | |
1645 | u8 *sense = NULL; | |
1da177e4 | 1646 | int expires; |
1da177e4 | 1647 | |
9ba333dc | 1648 | cqr = (struct dasd_ccw_req *) intparm; |
1da177e4 LT |
1649 | if (IS_ERR(irb)) { |
1650 | switch (PTR_ERR(irb)) { | |
1651 | case -EIO: | |
9ba333dc | 1652 | if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) { |
c9346151 | 1653 | device = cqr->startdev; |
9ba333dc SH |
1654 | cqr->status = DASD_CQR_CLEARED; |
1655 | dasd_device_clear_timer(device); | |
1656 | wake_up(&dasd_flush_wq); | |
1657 | dasd_schedule_device_bh(device); | |
1658 | return; | |
1659 | } | |
1da177e4 LT |
1660 | break; |
1661 | case -ETIMEDOUT: | |
b8ed5dd5 SH |
1662 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1663 | "request timed out\n", __func__); | |
1da177e4 LT |
1664 | break; |
1665 | default: | |
b8ed5dd5 SH |
1666 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1667 | "unknown error %ld\n", __func__, | |
1668 | PTR_ERR(irb)); | |
1da177e4 | 1669 | } |
f16f5843 | 1670 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1671 | return; |
1672 | } | |
1673 | ||
1aae0560 | 1674 | now = get_tod_clock(); |
5a27e60d SW |
1675 | /* check for conditions that should be handled immediately */ |
1676 | if (!cqr || | |
1677 | !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
1678 | scsw_cstat(&irb->scsw) == 0)) { | |
a5a0061f SW |
1679 | if (cqr) |
1680 | memcpy(&cqr->irb, irb, sizeof(*irb)); | |
a00bfd71 | 1681 | device = dasd_device_from_cdev_locked(cdev); |
56b86b61 SH |
1682 | if (IS_ERR(device)) |
1683 | return; | |
1684 | /* ignore unsolicited interrupts for DIAG discipline */ | |
1685 | if (device->discipline == dasd_diag_discipline_pointer) { | |
1da177e4 | 1686 | dasd_put_device(device); |
56b86b61 | 1687 | return; |
1da177e4 | 1688 | } |
8fd57520 JH |
1689 | |
1690 | /* | |
1691 | * In some cases 'File Protected' or 'No Record Found' errors | |
1692 | * might be expected and debug log messages for the | |
1693 | * corresponding interrupts shouldn't be written then. | |
1694 | * Check if either of the according suppress bits is set. | |
1695 | */ | |
1696 | sense = dasd_get_sense(irb); | |
1697 | if (sense) { | |
1698 | fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) && | |
1699 | test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags); | |
1700 | nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) && | |
1701 | test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags); | |
1702 | } | |
1703 | if (!(fp_suppressed || nrf_suppressed)) | |
1704 | device->discipline->dump_sense_dbf(device, irb, "int"); | |
1705 | ||
5a27e60d SW |
1706 | if (device->features & DASD_FEATURE_ERPLOG) |
1707 | device->discipline->dump_sense(device, cqr, irb); | |
1708 | device->discipline->check_for_device_change(device, cqr, irb); | |
56b86b61 | 1709 | dasd_put_device(device); |
1da177e4 | 1710 | } |
5db8440c SH |
1711 | |
1712 | /* check for for attention message */ | |
1713 | if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) { | |
1714 | device = dasd_device_from_cdev_locked(cdev); | |
1715 | device->discipline->check_attention(device, irb->esw.esw1.lpum); | |
1716 | dasd_put_device(device); | |
1717 | } | |
1718 | ||
5a27e60d SW |
1719 | if (!cqr) |
1720 | return; | |
1da177e4 | 1721 | |
8e09f215 SW |
1722 | device = (struct dasd_device *) cqr->startdev; |
1723 | if (!device || | |
1da177e4 | 1724 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
294001a8 SH |
1725 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1726 | "invalid device in request"); | |
1da177e4 LT |
1727 | return; |
1728 | } | |
1729 | ||
1730 | /* Check for clear pending */ | |
8e09f215 | 1731 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1732 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1733 | cqr->status = DASD_CQR_CLEARED; |
1734 | dasd_device_clear_timer(device); | |
8f61701b | 1735 | wake_up(&dasd_flush_wq); |
8e09f215 | 1736 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1737 | return; |
1738 | } | |
1739 | ||
f3eb5384 | 1740 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1741 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1742 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1743 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1744 | return; |
1745 | } | |
fc19f381 | 1746 | |
8e09f215 | 1747 | next = NULL; |
1da177e4 | 1748 | expires = 0; |
f3eb5384 SW |
1749 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1750 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1751 | /* request was completed successfully */ |
1752 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1753 | cqr->stopclk = now; |
1754 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1755 | if (cqr->devlist.next != &device->ccw_queue) { |
1756 | next = list_entry(cqr->devlist.next, | |
1757 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1758 | } |
8e09f215 | 1759 | } else { /* error */ |
a521b048 SH |
1760 | /* check for HPF error |
1761 | * call discipline function to requeue all requests | |
1762 | * and disable HPF accordingly | |
1763 | */ | |
1764 | if (cqr->cpmode && dasd_check_hpf_error(irb) && | |
1765 | device->discipline->handle_hpf_error) | |
1766 | device->discipline->handle_hpf_error(device, irb); | |
6c5f57c7 SH |
1767 | /* |
1768 | * If we don't want complex ERP for this request, then just | |
1769 | * reset this and retry it in the fastpath | |
8e09f215 | 1770 | */ |
6c5f57c7 | 1771 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1772 | cqr->retries > 0) { |
c9346151 | 1773 | if (cqr->lpm == dasd_path_get_opm(device)) |
fc19f381 SH |
1774 | DBF_DEV_EVENT(DBF_DEBUG, device, |
1775 | "default ERP in fastpath " | |
1776 | "(%i retries left)", | |
1777 | cqr->retries); | |
a4d26c6a | 1778 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) |
c9346151 | 1779 | cqr->lpm = dasd_path_get_opm(device); |
8e09f215 SW |
1780 | cqr->status = DASD_CQR_QUEUED; |
1781 | next = cqr; | |
1782 | } else | |
1da177e4 | 1783 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1784 | } |
1785 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1786 | (!device->stopped)) { | |
1787 | if (device->discipline->start_IO(next) == 0) | |
1788 | expires = next->expires; | |
1da177e4 LT |
1789 | } |
1790 | if (expires != 0) | |
8e09f215 | 1791 | dasd_device_set_timer(device, expires); |
1da177e4 | 1792 | else |
8e09f215 SW |
1793 | dasd_device_clear_timer(device); |
1794 | dasd_schedule_device_bh(device); | |
1da177e4 | 1795 | } |
7048a2b5 | 1796 | EXPORT_SYMBOL(dasd_int_handler); |
1da177e4 | 1797 | |
a23ed009 SH |
1798 | enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) |
1799 | { | |
1800 | struct dasd_device *device; | |
1801 | ||
1802 | device = dasd_device_from_cdev_locked(cdev); | |
1803 | ||
1804 | if (IS_ERR(device)) | |
1805 | goto out; | |
1806 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || | |
1807 | device->state != device->target || | |
5a27e60d | 1808 | !device->discipline->check_for_device_change){ |
a23ed009 SH |
1809 | dasd_put_device(device); |
1810 | goto out; | |
1811 | } | |
5a27e60d SW |
1812 | if (device->discipline->dump_sense_dbf) |
1813 | device->discipline->dump_sense_dbf(device, irb, "uc"); | |
1814 | device->discipline->check_for_device_change(device, NULL, irb); | |
a23ed009 SH |
1815 | dasd_put_device(device); |
1816 | out: | |
1817 | return UC_TODO_RETRY; | |
1818 | } | |
1819 | EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); | |
1820 | ||
1da177e4 | 1821 | /* |
8e09f215 SW |
1822 | * If we have an error on a dasd_block layer request then we cancel |
1823 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1824 | */ |
8e09f215 SW |
1825 | static void __dasd_device_recovery(struct dasd_device *device, |
1826 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1827 | { |
8e09f215 SW |
1828 | struct list_head *l, *n; |
1829 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1830 | |
8e09f215 SW |
1831 | /* |
1832 | * only requeue request that came from the dasd_block layer | |
1833 | */ | |
1834 | if (!ref_cqr->block) | |
1835 | return; | |
1da177e4 | 1836 | |
8e09f215 SW |
1837 | list_for_each_safe(l, n, &device->ccw_queue) { |
1838 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1839 | if (cqr->status == DASD_CQR_QUEUED && | |
1840 | ref_cqr->block == cqr->block) { | |
1841 | cqr->status = DASD_CQR_CLEARED; | |
1842 | } | |
1843 | } | |
1844 | }; | |
1da177e4 LT |
1845 | |
1846 | /* | |
8e09f215 SW |
1847 | * Remove those ccw requests from the queue that need to be returned |
1848 | * to the upper layer. | |
1da177e4 | 1849 | */ |
8e09f215 SW |
1850 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1851 | struct list_head *final_queue) | |
1da177e4 LT |
1852 | { |
1853 | struct list_head *l, *n; | |
1854 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1855 | |
1da177e4 LT |
1856 | /* Process request with final status. */ |
1857 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1858 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1859 | ||
1fbdb8be | 1860 | /* Skip any non-final request. */ |
8e09f215 SW |
1861 | if (cqr->status == DASD_CQR_QUEUED || |
1862 | cqr->status == DASD_CQR_IN_IO || | |
1863 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1fbdb8be | 1864 | continue; |
1da177e4 | 1865 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1866 | __dasd_device_recovery(device, cqr); |
20c64468 | 1867 | } |
1da177e4 | 1868 | /* Rechain finished requests to final queue */ |
8e09f215 | 1869 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1870 | } |
1871 | } | |
1872 | ||
1da177e4 | 1873 | /* |
8e09f215 SW |
1874 | * the cqrs from the final queue are returned to the upper layer |
1875 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1876 | */ |
8e09f215 SW |
1877 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1878 | struct list_head *final_queue) | |
1da177e4 | 1879 | { |
8e09f215 | 1880 | struct list_head *l, *n; |
1da177e4 | 1881 | struct dasd_ccw_req *cqr; |
03513bcc | 1882 | struct dasd_block *block; |
c80ee724 SH |
1883 | void (*callback)(struct dasd_ccw_req *, void *data); |
1884 | void *callback_data; | |
fc19f381 | 1885 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1886 | |
8e09f215 SW |
1887 | list_for_each_safe(l, n, final_queue) { |
1888 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1889 | list_del_init(&cqr->devlist); | |
03513bcc | 1890 | block = cqr->block; |
c80ee724 SH |
1891 | callback = cqr->callback; |
1892 | callback_data = cqr->callback_data; | |
03513bcc SW |
1893 | if (block) |
1894 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1895 | switch (cqr->status) { |
1896 | case DASD_CQR_SUCCESS: | |
1897 | cqr->status = DASD_CQR_DONE; | |
1898 | break; | |
1899 | case DASD_CQR_ERROR: | |
1900 | cqr->status = DASD_CQR_NEED_ERP; | |
1901 | break; | |
1902 | case DASD_CQR_CLEARED: | |
1903 | cqr->status = DASD_CQR_TERMINATED; | |
1904 | break; | |
1905 | default: | |
fc19f381 SH |
1906 | /* internal error 12 - wrong cqr status*/ |
1907 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1908 | dev_err(&device->cdev->dev, | |
1909 | "An error occurred in the DASD device driver, " | |
1910 | "reason=%s\n", errorstring); | |
8e09f215 | 1911 | BUG(); |
1da177e4 | 1912 | } |
8e09f215 | 1913 | if (cqr->callback != NULL) |
c80ee724 | 1914 | (callback)(cqr, callback_data); |
03513bcc SW |
1915 | if (block) |
1916 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1917 | } |
1918 | } | |
1919 | ||
1920 | /* | |
1921 | * Take a look at the first request on the ccw queue and check | |
1922 | * if it reached its expire time. If so, terminate the IO. | |
1923 | */ | |
8e09f215 | 1924 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1925 | { |
1926 | struct dasd_ccw_req *cqr; | |
1927 | ||
1928 | if (list_empty(&device->ccw_queue)) | |
1929 | return; | |
8e09f215 | 1930 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1931 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1932 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
d07dc5d8 SH |
1933 | if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { |
1934 | /* | |
1935 | * IO in safe offline processing should not | |
1936 | * run out of retries | |
1937 | */ | |
1938 | cqr->retries++; | |
1939 | } | |
29145a6c HH |
1940 | if (device->discipline->term_IO(cqr) != 0) { |
1941 | /* Hmpf, try again in 5 sec */ | |
fc19f381 | 1942 | dev_err(&device->cdev->dev, |
625c94df | 1943 | "cqr %p timed out (%lus) but cannot be " |
fc19f381 SH |
1944 | "ended, retrying in 5 s\n", |
1945 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1946 | cqr->expires += 5*HZ; |
1947 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1948 | } else { |
fc19f381 | 1949 | dev_err(&device->cdev->dev, |
625c94df | 1950 | "cqr %p timed out (%lus), %i retries " |
fc19f381 SH |
1951 | "remaining\n", cqr, (cqr->expires/HZ), |
1952 | cqr->retries); | |
1da177e4 LT |
1953 | } |
1954 | } | |
1955 | } | |
1956 | ||
f81a49d1 SH |
1957 | /* |
1958 | * return 1 when device is not eligible for IO | |
1959 | */ | |
1960 | static int __dasd_device_is_unusable(struct dasd_device *device, | |
1961 | struct dasd_ccw_req *cqr) | |
1962 | { | |
1963 | int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM); | |
1964 | ||
1965 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
1966 | /* dasd is being set offline. */ | |
1967 | return 1; | |
1968 | } | |
1969 | if (device->stopped) { | |
1970 | if (device->stopped & mask) { | |
1971 | /* stopped and CQR will not change that. */ | |
1972 | return 1; | |
1973 | } | |
1974 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { | |
1975 | /* CQR is not able to change device to | |
1976 | * operational. */ | |
1977 | return 1; | |
1978 | } | |
1979 | /* CQR required to get device operational. */ | |
1980 | } | |
1981 | return 0; | |
1982 | } | |
1983 | ||
1da177e4 LT |
1984 | /* |
1985 | * Take a look at the first request on the ccw queue and check | |
1986 | * if it needs to be started. | |
1987 | */ | |
8e09f215 | 1988 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1989 | { |
1990 | struct dasd_ccw_req *cqr; | |
1991 | int rc; | |
1992 | ||
1993 | if (list_empty(&device->ccw_queue)) | |
1994 | return; | |
8e09f215 | 1995 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1996 | if (cqr->status != DASD_CQR_QUEUED) |
1997 | return; | |
f81a49d1 SH |
1998 | /* if device is not usable return request to upper layer */ |
1999 | if (__dasd_device_is_unusable(device, cqr)) { | |
a4d26c6a | 2000 | cqr->intrc = -EAGAIN; |
8e09f215 SW |
2001 | cqr->status = DASD_CQR_CLEARED; |
2002 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 2003 | return; |
1c01b8a5 | 2004 | } |
25ee4cf8 PO |
2005 | |
2006 | rc = device->discipline->start_IO(cqr); | |
2007 | if (rc == 0) | |
8e09f215 | 2008 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 2009 | else if (rc == -EACCES) { |
8e09f215 | 2010 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
2011 | } else |
2012 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 2013 | dasd_device_set_timer(device, 50); |
8f61701b HH |
2014 | } |
2015 | ||
a4d26c6a SW |
2016 | static void __dasd_device_check_path_events(struct dasd_device *device) |
2017 | { | |
2018 | int rc; | |
2019 | ||
c9346151 SH |
2020 | if (!dasd_path_get_tbvpm(device)) |
2021 | return; | |
2022 | ||
2023 | if (device->stopped & | |
2024 | ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) | |
2025 | return; | |
2026 | rc = device->discipline->verify_path(device, | |
2027 | dasd_path_get_tbvpm(device)); | |
2028 | if (rc) | |
2029 | dasd_device_set_timer(device, 50); | |
2030 | else | |
2031 | dasd_path_clear_all_verify(device); | |
a4d26c6a SW |
2032 | }; |
2033 | ||
1da177e4 | 2034 | /* |
8e09f215 SW |
2035 | * Go through all request on the dasd_device request queue, |
2036 | * terminate them on the cdev if necessary, and return them to the | |
2037 | * submitting layer via callback. | |
2038 | * Note: | |
2039 | * Make sure that all 'submitting layers' still exist when | |
2040 | * this function is called!. In other words, when 'device' is a base | |
2041 | * device then all block layer requests must have been removed before | |
2042 | * via dasd_flush_block_queue. | |
1da177e4 | 2043 | */ |
8e09f215 | 2044 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 2045 | { |
8e09f215 SW |
2046 | struct dasd_ccw_req *cqr, *n; |
2047 | int rc; | |
1da177e4 | 2048 | struct list_head flush_queue; |
1da177e4 LT |
2049 | |
2050 | INIT_LIST_HEAD(&flush_queue); | |
2051 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 2052 | rc = 0; |
8e09f215 | 2053 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
2054 | /* Check status and move request to flush_queue */ |
2055 | switch (cqr->status) { | |
2056 | case DASD_CQR_IN_IO: | |
2057 | rc = device->discipline->term_IO(cqr); | |
2058 | if (rc) { | |
2059 | /* unable to terminate requeust */ | |
fc19f381 SH |
2060 | dev_err(&device->cdev->dev, |
2061 | "Flushing the DASD request queue " | |
2062 | "failed for request %p\n", cqr); | |
8f61701b HH |
2063 | /* stop flush processing */ |
2064 | goto finished; | |
2065 | } | |
2066 | break; | |
2067 | case DASD_CQR_QUEUED: | |
1aae0560 | 2068 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 2069 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 2070 | break; |
8e09f215 | 2071 | default: /* no need to modify the others */ |
8f61701b HH |
2072 | break; |
2073 | } | |
8e09f215 | 2074 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 2075 | } |
8f61701b HH |
2076 | finished: |
2077 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
2078 | /* |
2079 | * After this point all requests must be in state CLEAR_PENDING, | |
2080 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
2081 | * one of the others. | |
2082 | */ | |
2083 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
2084 | wait_event(dasd_flush_wq, | |
2085 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
2086 | /* | |
2087 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
2088 | * and call the callback function of flushed requests | |
2089 | */ | |
2090 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 2091 | return rc; |
1da177e4 | 2092 | } |
7048a2b5 | 2093 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); |
1da177e4 LT |
2094 | |
2095 | /* | |
2096 | * Acquire the device lock and process queues for the device. | |
2097 | */ | |
8e09f215 | 2098 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
2099 | { |
2100 | struct list_head final_queue; | |
1da177e4 LT |
2101 | |
2102 | atomic_set (&device->tasklet_scheduled, 0); | |
2103 | INIT_LIST_HEAD(&final_queue); | |
2104 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
2105 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
2106 | __dasd_device_check_expire(device); |
2107 | /* find final requests on ccw queue */ | |
2108 | __dasd_device_process_ccw_queue(device, &final_queue); | |
a4d26c6a | 2109 | __dasd_device_check_path_events(device); |
1da177e4 LT |
2110 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2111 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
2112 | __dasd_device_process_final_queue(device, &final_queue); |
2113 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 2114 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2115 | __dasd_device_start_head(device); |
2116 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
4679e893 SH |
2117 | if (waitqueue_active(&shutdown_waitq)) |
2118 | wake_up(&shutdown_waitq); | |
1da177e4 LT |
2119 | dasd_put_device(device); |
2120 | } | |
2121 | ||
2122 | /* | |
2123 | * Schedules a call to dasd_tasklet over the device tasklet. | |
2124 | */ | |
8e09f215 | 2125 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
2126 | { |
2127 | /* Protect against rescheduling. */ | |
973bd993 | 2128 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
2129 | return; |
2130 | dasd_get_device(device); | |
2131 | tasklet_hi_schedule(&device->tasklet); | |
2132 | } | |
7048a2b5 | 2133 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
1da177e4 | 2134 | |
eb6e199b SW |
2135 | void dasd_device_set_stop_bits(struct dasd_device *device, int bits) |
2136 | { | |
2137 | device->stopped |= bits; | |
2138 | } | |
2139 | EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); | |
2140 | ||
2141 | void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) | |
2142 | { | |
2143 | device->stopped &= ~bits; | |
2144 | if (!device->stopped) | |
2145 | wake_up(&generic_waitq); | |
2146 | } | |
2147 | EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); | |
2148 | ||
1da177e4 | 2149 | /* |
8e09f215 SW |
2150 | * Queue a request to the head of the device ccw_queue. |
2151 | * Start the I/O if possible. | |
1da177e4 | 2152 | */ |
8e09f215 | 2153 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2154 | { |
2155 | struct dasd_device *device; | |
2156 | unsigned long flags; | |
2157 | ||
8e09f215 | 2158 | device = cqr->startdev; |
1da177e4 | 2159 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
2160 | cqr->status = DASD_CQR_QUEUED; |
2161 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 2162 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2163 | dasd_schedule_device_bh(device); |
1da177e4 LT |
2164 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
2165 | } | |
7048a2b5 | 2166 | EXPORT_SYMBOL(dasd_add_request_head); |
1da177e4 LT |
2167 | |
2168 | /* | |
8e09f215 SW |
2169 | * Queue a request to the tail of the device ccw_queue. |
2170 | * Start the I/O if possible. | |
1da177e4 | 2171 | */ |
8e09f215 | 2172 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2173 | { |
2174 | struct dasd_device *device; | |
2175 | unsigned long flags; | |
2176 | ||
8e09f215 | 2177 | device = cqr->startdev; |
1da177e4 | 2178 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
2179 | cqr->status = DASD_CQR_QUEUED; |
2180 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 2181 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2182 | dasd_schedule_device_bh(device); |
1da177e4 LT |
2183 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
2184 | } | |
7048a2b5 | 2185 | EXPORT_SYMBOL(dasd_add_request_tail); |
1da177e4 LT |
2186 | |
2187 | /* | |
8e09f215 | 2188 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 2189 | */ |
5915a873 | 2190 | void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 | 2191 | { |
1c1e093c SW |
2192 | spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); |
2193 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
2194 | spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); | |
2195 | wake_up(&generic_waitq); | |
1da177e4 | 2196 | } |
5915a873 | 2197 | EXPORT_SYMBOL_GPL(dasd_wakeup_cb); |
1da177e4 | 2198 | |
8e09f215 | 2199 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2200 | { |
2201 | struct dasd_device *device; | |
2202 | int rc; | |
2203 | ||
8e09f215 | 2204 | device = cqr->startdev; |
1da177e4 | 2205 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1c1e093c | 2206 | rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); |
1da177e4 LT |
2207 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2208 | return rc; | |
2209 | } | |
2210 | ||
2211 | /* | |
eb6e199b | 2212 | * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. |
1da177e4 | 2213 | */ |
eb6e199b | 2214 | static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) |
1da177e4 | 2215 | { |
1da177e4 | 2216 | struct dasd_device *device; |
eb6e199b | 2217 | dasd_erp_fn_t erp_fn; |
138c014d | 2218 | |
eb6e199b SW |
2219 | if (cqr->status == DASD_CQR_FILLED) |
2220 | return 0; | |
8e09f215 | 2221 | device = cqr->startdev; |
eb6e199b SW |
2222 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
2223 | if (cqr->status == DASD_CQR_TERMINATED) { | |
2224 | device->discipline->handle_terminated_request(cqr); | |
2225 | return 1; | |
2226 | } | |
2227 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
2228 | erp_fn = device->discipline->erp_action(cqr); | |
2229 | erp_fn(cqr); | |
2230 | return 1; | |
2231 | } | |
2232 | if (cqr->status == DASD_CQR_FAILED) | |
2233 | dasd_log_sense(cqr, &cqr->irb); | |
2234 | if (cqr->refers) { | |
2235 | __dasd_process_erp(device, cqr); | |
2236 | return 1; | |
2237 | } | |
2238 | } | |
2239 | return 0; | |
2240 | } | |
138c014d | 2241 | |
eb6e199b SW |
2242 | static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) |
2243 | { | |
2244 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { | |
2245 | if (cqr->refers) /* erp is not done yet */ | |
2246 | return 1; | |
2247 | return ((cqr->status != DASD_CQR_DONE) && | |
2248 | (cqr->status != DASD_CQR_FAILED)); | |
2249 | } else | |
2250 | return (cqr->status == DASD_CQR_FILLED); | |
2251 | } | |
138c014d | 2252 | |
eb6e199b SW |
2253 | static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) |
2254 | { | |
2255 | struct dasd_device *device; | |
2256 | int rc; | |
2257 | struct list_head ccw_queue; | |
2258 | struct dasd_ccw_req *cqr; | |
2259 | ||
2260 | INIT_LIST_HEAD(&ccw_queue); | |
2261 | maincqr->status = DASD_CQR_FILLED; | |
2262 | device = maincqr->startdev; | |
2263 | list_add(&maincqr->blocklist, &ccw_queue); | |
2264 | for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); | |
2265 | cqr = list_first_entry(&ccw_queue, | |
2266 | struct dasd_ccw_req, blocklist)) { | |
2267 | ||
2268 | if (__dasd_sleep_on_erp(cqr)) | |
2269 | continue; | |
2270 | if (cqr->status != DASD_CQR_FILLED) /* could be failed */ | |
2271 | continue; | |
5a27e60d SW |
2272 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
2273 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2274 | cqr->status = DASD_CQR_FAILED; | |
2275 | cqr->intrc = -EPERM; | |
2276 | continue; | |
2277 | } | |
eb6e199b SW |
2278 | /* Non-temporary stop condition will trigger fail fast */ |
2279 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
2280 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2281 | (!dasd_eer_enabled(device))) { | |
2282 | cqr->status = DASD_CQR_FAILED; | |
d1ffc1f8 | 2283 | cqr->intrc = -ENOLINK; |
eb6e199b SW |
2284 | continue; |
2285 | } | |
a9f6273f SH |
2286 | /* |
2287 | * Don't try to start requests if device is in | |
2288 | * offline processing, it might wait forever | |
2289 | */ | |
2290 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2291 | cqr->status = DASD_CQR_FAILED; | |
2292 | cqr->intrc = -ENODEV; | |
2293 | continue; | |
2294 | } | |
df3044f1 SH |
2295 | /* |
2296 | * Don't try to start requests if device is stopped | |
2297 | * except path verification requests | |
2298 | */ | |
2299 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { | |
2300 | if (interruptible) { | |
2301 | rc = wait_event_interruptible( | |
2302 | generic_waitq, !(device->stopped)); | |
2303 | if (rc == -ERESTARTSYS) { | |
2304 | cqr->status = DASD_CQR_FAILED; | |
2305 | maincqr->intrc = rc; | |
2306 | continue; | |
2307 | } | |
2308 | } else | |
2309 | wait_event(generic_waitq, !(device->stopped)); | |
2310 | } | |
5915a873 SH |
2311 | if (!cqr->callback) |
2312 | cqr->callback = dasd_wakeup_cb; | |
2313 | ||
1c1e093c | 2314 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
eb6e199b SW |
2315 | dasd_add_request_tail(cqr); |
2316 | if (interruptible) { | |
2317 | rc = wait_event_interruptible( | |
2318 | generic_waitq, _wait_for_wakeup(cqr)); | |
2319 | if (rc == -ERESTARTSYS) { | |
2320 | dasd_cancel_req(cqr); | |
2321 | /* wait (non-interruptible) for final status */ | |
2322 | wait_event(generic_waitq, | |
2323 | _wait_for_wakeup(cqr)); | |
2324 | cqr->status = DASD_CQR_FAILED; | |
2325 | maincqr->intrc = rc; | |
2326 | continue; | |
2327 | } | |
2328 | } else | |
2329 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); | |
2330 | } | |
2331 | ||
1aae0560 | 2332 | maincqr->endclk = get_tod_clock(); |
eb6e199b SW |
2333 | if ((maincqr->status != DASD_CQR_DONE) && |
2334 | (maincqr->intrc != -ERESTARTSYS)) | |
2335 | dasd_log_sense(maincqr, &maincqr->irb); | |
2336 | if (maincqr->status == DASD_CQR_DONE) | |
6cc7f168 | 2337 | rc = 0; |
eb6e199b SW |
2338 | else if (maincqr->intrc) |
2339 | rc = maincqr->intrc; | |
6cc7f168 SW |
2340 | else |
2341 | rc = -EIO; | |
1da177e4 LT |
2342 | return rc; |
2343 | } | |
2344 | ||
d42e1712 SH |
2345 | static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue) |
2346 | { | |
2347 | struct dasd_ccw_req *cqr; | |
2348 | ||
2349 | list_for_each_entry(cqr, ccw_queue, blocklist) { | |
2350 | if (cqr->callback_data != DASD_SLEEPON_END_TAG) | |
2351 | return 0; | |
2352 | } | |
2353 | ||
2354 | return 1; | |
2355 | } | |
2356 | ||
2357 | static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible) | |
2358 | { | |
2359 | struct dasd_device *device; | |
d42e1712 | 2360 | struct dasd_ccw_req *cqr, *n; |
8fd57520 | 2361 | u8 *sense = NULL; |
362ce84f | 2362 | int rc; |
d42e1712 SH |
2363 | |
2364 | retry: | |
2365 | list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { | |
2366 | device = cqr->startdev; | |
2367 | if (cqr->status != DASD_CQR_FILLED) /*could be failed*/ | |
2368 | continue; | |
2369 | ||
2370 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && | |
2371 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2372 | cqr->status = DASD_CQR_FAILED; | |
2373 | cqr->intrc = -EPERM; | |
2374 | continue; | |
2375 | } | |
2376 | /*Non-temporary stop condition will trigger fail fast*/ | |
2377 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
2378 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2379 | !dasd_eer_enabled(device)) { | |
2380 | cqr->status = DASD_CQR_FAILED; | |
2381 | cqr->intrc = -EAGAIN; | |
2382 | continue; | |
2383 | } | |
2384 | ||
2385 | /*Don't try to start requests if device is stopped*/ | |
2386 | if (interruptible) { | |
2387 | rc = wait_event_interruptible( | |
2388 | generic_waitq, !device->stopped); | |
2389 | if (rc == -ERESTARTSYS) { | |
2390 | cqr->status = DASD_CQR_FAILED; | |
2391 | cqr->intrc = rc; | |
2392 | continue; | |
2393 | } | |
2394 | } else | |
2395 | wait_event(generic_waitq, !(device->stopped)); | |
2396 | ||
2397 | if (!cqr->callback) | |
2398 | cqr->callback = dasd_wakeup_cb; | |
2399 | cqr->callback_data = DASD_SLEEPON_START_TAG; | |
2400 | dasd_add_request_tail(cqr); | |
2401 | } | |
2402 | ||
2403 | wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue)); | |
2404 | ||
2405 | rc = 0; | |
2406 | list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { | |
8fd57520 JH |
2407 | /* |
2408 | * In some cases the 'File Protected' or 'Incorrect Length' | |
2409 | * error might be expected and error recovery would be | |
2410 | * unnecessary in these cases. Check if the according suppress | |
2411 | * bit is set. | |
2412 | */ | |
2413 | sense = dasd_get_sense(&cqr->irb); | |
2414 | if (sense && sense[1] & SNS1_FILE_PROTECTED && | |
2415 | test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags)) | |
2416 | continue; | |
2417 | if (scsw_cstat(&cqr->irb.scsw) == 0x40 && | |
2418 | test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags)) | |
2419 | continue; | |
2420 | ||
29b8dd9d SH |
2421 | /* |
2422 | * for alias devices simplify error recovery and | |
2423 | * return to upper layer | |
362ce84f | 2424 | * do not skip ERP requests |
29b8dd9d | 2425 | */ |
362ce84f | 2426 | if (cqr->startdev != cqr->basedev && !cqr->refers && |
29b8dd9d SH |
2427 | (cqr->status == DASD_CQR_TERMINATED || |
2428 | cqr->status == DASD_CQR_NEED_ERP)) | |
2429 | return -EAGAIN; | |
362ce84f SH |
2430 | |
2431 | /* normal recovery for basedev IO */ | |
590aeedd SH |
2432 | if (__dasd_sleep_on_erp(cqr)) |
2433 | /* handle erp first */ | |
362ce84f | 2434 | goto retry; |
d42e1712 | 2435 | } |
362ce84f | 2436 | |
d42e1712 SH |
2437 | return 0; |
2438 | } | |
2439 | ||
eb6e199b SW |
2440 | /* |
2441 | * Queue a request to the tail of the device ccw_queue and wait for | |
2442 | * it's completion. | |
2443 | */ | |
2444 | int dasd_sleep_on(struct dasd_ccw_req *cqr) | |
2445 | { | |
2446 | return _dasd_sleep_on(cqr, 0); | |
2447 | } | |
7048a2b5 | 2448 | EXPORT_SYMBOL(dasd_sleep_on); |
eb6e199b | 2449 | |
d42e1712 SH |
2450 | /* |
2451 | * Start requests from a ccw_queue and wait for their completion. | |
2452 | */ | |
2453 | int dasd_sleep_on_queue(struct list_head *ccw_queue) | |
2454 | { | |
2455 | return _dasd_sleep_on_queue(ccw_queue, 0); | |
2456 | } | |
2457 | EXPORT_SYMBOL(dasd_sleep_on_queue); | |
2458 | ||
1da177e4 | 2459 | /* |
8e09f215 SW |
2460 | * Queue a request to the tail of the device ccw_queue and wait |
2461 | * interruptible for it's completion. | |
1da177e4 | 2462 | */ |
8e09f215 | 2463 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 2464 | { |
eb6e199b | 2465 | return _dasd_sleep_on(cqr, 1); |
1da177e4 | 2466 | } |
7048a2b5 | 2467 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); |
1da177e4 LT |
2468 | |
2469 | /* | |
2470 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
2471 | * for eckd devices) the currently running request has to be terminated | |
2472 | * and be put back to status queued, before the special request is added | |
2473 | * to the head of the queue. Then the special request is waited on normally. | |
2474 | */ | |
8e09f215 | 2475 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
2476 | { |
2477 | struct dasd_ccw_req *cqr; | |
aade6c0d | 2478 | int rc; |
1da177e4 LT |
2479 | |
2480 | if (list_empty(&device->ccw_queue)) | |
2481 | return 0; | |
8e09f215 | 2482 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
aade6c0d SH |
2483 | rc = device->discipline->term_IO(cqr); |
2484 | if (!rc) | |
2485 | /* | |
2486 | * CQR terminated because a more important request is pending. | |
2487 | * Undo decreasing of retry counter because this is | |
2488 | * not an error case. | |
2489 | */ | |
2490 | cqr->retries++; | |
2491 | return rc; | |
1da177e4 LT |
2492 | } |
2493 | ||
8e09f215 | 2494 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 2495 | { |
1da177e4 LT |
2496 | struct dasd_device *device; |
2497 | int rc; | |
138c014d | 2498 | |
8e09f215 | 2499 | device = cqr->startdev; |
5a27e60d SW |
2500 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
2501 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2502 | cqr->status = DASD_CQR_FAILED; | |
2503 | cqr->intrc = -EPERM; | |
2504 | return -EIO; | |
2505 | } | |
1da177e4 LT |
2506 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
2507 | rc = _dasd_term_running_cqr(device); | |
2508 | if (rc) { | |
2509 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
2510 | return rc; | |
2511 | } | |
1da177e4 | 2512 | cqr->callback = dasd_wakeup_cb; |
1c1e093c | 2513 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
1da177e4 | 2514 | cqr->status = DASD_CQR_QUEUED; |
214b8ffc SH |
2515 | /* |
2516 | * add new request as second | |
2517 | * first the terminated cqr needs to be finished | |
2518 | */ | |
2519 | list_add(&cqr->devlist, device->ccw_queue.next); | |
138c014d | 2520 | |
1da177e4 | 2521 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2522 | dasd_schedule_device_bh(device); |
138c014d | 2523 | |
1da177e4 LT |
2524 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2525 | ||
c80ee724 | 2526 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 2527 | |
6cc7f168 SW |
2528 | if (cqr->status == DASD_CQR_DONE) |
2529 | rc = 0; | |
2530 | else if (cqr->intrc) | |
2531 | rc = cqr->intrc; | |
2532 | else | |
2533 | rc = -EIO; | |
0e003b70 SH |
2534 | |
2535 | /* kick tasklets */ | |
2536 | dasd_schedule_device_bh(device); | |
2537 | if (device->block) | |
2538 | dasd_schedule_block_bh(device->block); | |
2539 | ||
1da177e4 LT |
2540 | return rc; |
2541 | } | |
7048a2b5 | 2542 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); |
1da177e4 LT |
2543 | |
2544 | /* | |
2545 | * Cancels a request that was started with dasd_sleep_on_req. | |
2546 | * This is useful to timeout requests. The request will be | |
2547 | * terminated if it is currently in i/o. | |
b99a946d | 2548 | * Returns 0 if request termination was successful |
8e09f215 SW |
2549 | * negative error code if termination failed |
2550 | * Cancellation of a request is an asynchronous operation! The calling | |
2551 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 2552 | */ |
8e09f215 | 2553 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 2554 | { |
8e09f215 | 2555 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
2556 | unsigned long flags; |
2557 | int rc; | |
2558 | ||
2559 | rc = 0; | |
2560 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
2561 | switch (cqr->status) { | |
2562 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
2563 | /* request was not started - just set to cleared */ |
2564 | cqr->status = DASD_CQR_CLEARED; | |
931a3dce SH |
2565 | if (cqr->callback_data == DASD_SLEEPON_START_TAG) |
2566 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
1da177e4 LT |
2567 | break; |
2568 | case DASD_CQR_IN_IO: | |
2569 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
2570 | rc = device->discipline->term_IO(cqr); |
2571 | if (rc) { | |
fc19f381 SH |
2572 | dev_err(&device->cdev->dev, |
2573 | "Cancelling request %p failed with rc=%d\n", | |
2574 | cqr, rc); | |
8e09f215 | 2575 | } else { |
1aae0560 | 2576 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 2577 | } |
1da177e4 | 2578 | break; |
8e09f215 | 2579 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 2580 | break; |
8e09f215 SW |
2581 | } |
2582 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
2583 | dasd_schedule_device_bh(device); | |
2584 | return rc; | |
2585 | } | |
7048a2b5 | 2586 | EXPORT_SYMBOL(dasd_cancel_req); |
8e09f215 | 2587 | |
8e09f215 SW |
2588 | /* |
2589 | * SECTION: Operations of the dasd_block layer. | |
2590 | */ | |
2591 | ||
2592 | /* | |
2593 | * Timeout function for dasd_block. This is used when the block layer | |
2594 | * is waiting for something that may not come reliably, (e.g. a state | |
2595 | * change interrupt) | |
2596 | */ | |
2597 | static void dasd_block_timeout(unsigned long ptr) | |
2598 | { | |
2599 | unsigned long flags; | |
2600 | struct dasd_block *block; | |
2601 | ||
2602 | block = (struct dasd_block *) ptr; | |
2603 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
2604 | /* re-activate request queue */ | |
eb6e199b | 2605 | dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); |
8e09f215 SW |
2606 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
2607 | dasd_schedule_block_bh(block); | |
2608 | } | |
2609 | ||
2610 | /* | |
2611 | * Setup timeout for a dasd_block in jiffies. | |
2612 | */ | |
2613 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
2614 | { | |
48cae885 SW |
2615 | if (expires == 0) |
2616 | del_timer(&block->timer); | |
2617 | else | |
2618 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 | 2619 | } |
7048a2b5 | 2620 | EXPORT_SYMBOL(dasd_block_set_timer); |
8e09f215 SW |
2621 | |
2622 | /* | |
2623 | * Clear timeout for a dasd_block. | |
2624 | */ | |
2625 | void dasd_block_clear_timer(struct dasd_block *block) | |
2626 | { | |
48cae885 | 2627 | del_timer(&block->timer); |
8e09f215 | 2628 | } |
7048a2b5 | 2629 | EXPORT_SYMBOL(dasd_block_clear_timer); |
8e09f215 | 2630 | |
8e09f215 SW |
2631 | /* |
2632 | * Process finished error recovery ccw. | |
2633 | */ | |
eb6e199b SW |
2634 | static void __dasd_process_erp(struct dasd_device *device, |
2635 | struct dasd_ccw_req *cqr) | |
8e09f215 SW |
2636 | { |
2637 | dasd_erp_fn_t erp_fn; | |
8e09f215 SW |
2638 | |
2639 | if (cqr->status == DASD_CQR_DONE) | |
2640 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
2641 | else | |
fc19f381 | 2642 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
2643 | erp_fn = device->discipline->erp_postaction(cqr); |
2644 | erp_fn(cqr); | |
2645 | } | |
1da177e4 | 2646 | |
8e09f215 SW |
2647 | /* |
2648 | * Fetch requests from the block device queue. | |
2649 | */ | |
2650 | static void __dasd_process_request_queue(struct dasd_block *block) | |
2651 | { | |
2652 | struct request_queue *queue; | |
2653 | struct request *req; | |
2654 | struct dasd_ccw_req *cqr; | |
2655 | struct dasd_device *basedev; | |
2656 | unsigned long flags; | |
2657 | queue = block->request_queue; | |
2658 | basedev = block->base; | |
2659 | /* No queue ? Then there is nothing to do. */ | |
2660 | if (queue == NULL) | |
2661 | return; | |
2662 | ||
2663 | /* | |
2664 | * We requeue request from the block device queue to the ccw | |
2665 | * queue only in two states. In state DASD_STATE_READY the | |
2666 | * partition detection is done and we need to requeue requests | |
2667 | * for that. State DASD_STATE_ONLINE is normal block device | |
2668 | * operation. | |
2669 | */ | |
97f604b0 SW |
2670 | if (basedev->state < DASD_STATE_READY) { |
2671 | while ((req = blk_fetch_request(block->request_queue))) | |
2672 | __blk_end_request_all(req, -EIO); | |
8e09f215 | 2673 | return; |
97f604b0 | 2674 | } |
a3147a7b | 2675 | |
c6fc7b6f SH |
2676 | /* |
2677 | * if device is stopped do not fetch new requests | |
2678 | * except failfast is active which will let requests fail | |
2679 | * immediately in __dasd_block_start_head() | |
2680 | */ | |
2681 | if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST)) | |
a3147a7b SH |
2682 | return; |
2683 | ||
8e09f215 | 2684 | /* Now we try to fetch requests from the request queue */ |
7eaceacc | 2685 | while ((req = blk_peek_request(queue))) { |
8e09f215 SW |
2686 | if (basedev->features & DASD_FEATURE_READONLY && |
2687 | rq_data_dir(req) == WRITE) { | |
2688 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
2689 | "Rejecting write request %p", | |
2690 | req); | |
9934c8c0 | 2691 | blk_start_request(req); |
40cbbb78 | 2692 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
2693 | continue; |
2694 | } | |
5ea34a01 HR |
2695 | if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) && |
2696 | (basedev->features & DASD_FEATURE_FAILFAST || | |
2697 | blk_noretry_request(req))) { | |
2698 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
2699 | "Rejecting failfast request %p", | |
2700 | req); | |
2701 | blk_start_request(req); | |
2702 | __blk_end_request_all(req, -ETIMEDOUT); | |
2703 | continue; | |
2704 | } | |
8e09f215 SW |
2705 | cqr = basedev->discipline->build_cp(basedev, block, req); |
2706 | if (IS_ERR(cqr)) { | |
2707 | if (PTR_ERR(cqr) == -EBUSY) | |
2708 | break; /* normal end condition */ | |
2709 | if (PTR_ERR(cqr) == -ENOMEM) | |
2710 | break; /* terminate request queue loop */ | |
2711 | if (PTR_ERR(cqr) == -EAGAIN) { | |
2712 | /* | |
2713 | * The current request cannot be build right | |
2714 | * now, we have to try later. If this request | |
2715 | * is the head-of-queue we stop the device | |
2716 | * for 1/2 second. | |
2717 | */ | |
2718 | if (!list_empty(&block->ccw_queue)) | |
2719 | break; | |
eb6e199b SW |
2720 | spin_lock_irqsave( |
2721 | get_ccwdev_lock(basedev->cdev), flags); | |
2722 | dasd_device_set_stop_bits(basedev, | |
2723 | DASD_STOPPED_PENDING); | |
2724 | spin_unlock_irqrestore( | |
2725 | get_ccwdev_lock(basedev->cdev), flags); | |
8e09f215 SW |
2726 | dasd_block_set_timer(block, HZ/2); |
2727 | break; | |
2728 | } | |
2729 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
2730 | "CCW creation failed (rc=%ld) " | |
2731 | "on request %p", | |
2732 | PTR_ERR(cqr), req); | |
9934c8c0 | 2733 | blk_start_request(req); |
40cbbb78 | 2734 | __blk_end_request_all(req, -EIO); |
8e09f215 SW |
2735 | continue; |
2736 | } | |
2737 | /* | |
2738 | * Note: callback is set to dasd_return_cqr_cb in | |
2739 | * __dasd_block_start_head to cover erp requests as well | |
2740 | */ | |
2741 | cqr->callback_data = (void *) req; | |
2742 | cqr->status = DASD_CQR_FILLED; | |
a2ace466 | 2743 | req->completion_data = cqr; |
9934c8c0 | 2744 | blk_start_request(req); |
8e09f215 | 2745 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
a2ace466 | 2746 | INIT_LIST_HEAD(&cqr->devlist); |
8e09f215 SW |
2747 | dasd_profile_start(block, cqr, req); |
2748 | } | |
2749 | } | |
2750 | ||
2751 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
2752 | { | |
2753 | struct request *req; | |
2754 | int status; | |
4c4e2148 | 2755 | int error = 0; |
8e09f215 SW |
2756 | |
2757 | req = (struct request *) cqr->callback_data; | |
2758 | dasd_profile_end(cqr->block, cqr, req); | |
fe6b8e76 | 2759 | status = cqr->block->base->discipline->free_cp(cqr, req); |
d1ffc1f8 HR |
2760 | if (status < 0) |
2761 | error = status; | |
2762 | else if (status == 0) { | |
2763 | if (cqr->intrc == -EPERM) | |
2764 | error = -EBADE; | |
2765 | else if (cqr->intrc == -ENOLINK || | |
2766 | cqr->intrc == -ETIMEDOUT) | |
2767 | error = cqr->intrc; | |
2768 | else | |
2769 | error = -EIO; | |
2770 | } | |
40cbbb78 | 2771 | __blk_end_request_all(req, error); |
8e09f215 SW |
2772 | } |
2773 | ||
2774 | /* | |
2775 | * Process ccw request queue. | |
2776 | */ | |
2777 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
2778 | struct list_head *final_queue) | |
2779 | { | |
2780 | struct list_head *l, *n; | |
2781 | struct dasd_ccw_req *cqr; | |
2782 | dasd_erp_fn_t erp_fn; | |
2783 | unsigned long flags; | |
2784 | struct dasd_device *base = block->base; | |
2785 | ||
2786 | restart: | |
2787 | /* Process request with final status. */ | |
2788 | list_for_each_safe(l, n, &block->ccw_queue) { | |
2789 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2790 | if (cqr->status != DASD_CQR_DONE && | |
2791 | cqr->status != DASD_CQR_FAILED && | |
2792 | cqr->status != DASD_CQR_NEED_ERP && | |
2793 | cqr->status != DASD_CQR_TERMINATED) | |
2794 | continue; | |
2795 | ||
2796 | if (cqr->status == DASD_CQR_TERMINATED) { | |
2797 | base->discipline->handle_terminated_request(cqr); | |
2798 | goto restart; | |
2799 | } | |
2800 | ||
2801 | /* Process requests that may be recovered */ | |
2802 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 | 2803 | erp_fn = base->discipline->erp_action(cqr); |
6a5176c4 SH |
2804 | if (IS_ERR(erp_fn(cqr))) |
2805 | continue; | |
8e09f215 SW |
2806 | goto restart; |
2807 | } | |
2808 | ||
a9cffb22 SH |
2809 | /* log sense for fatal error */ |
2810 | if (cqr->status == DASD_CQR_FAILED) { | |
2811 | dasd_log_sense(cqr, &cqr->irb); | |
2812 | } | |
2813 | ||
8e09f215 SW |
2814 | /* First of all call extended error reporting. */ |
2815 | if (dasd_eer_enabled(base) && | |
2816 | cqr->status == DASD_CQR_FAILED) { | |
2817 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
2818 | ||
2819 | /* restart request */ | |
2820 | cqr->status = DASD_CQR_FILLED; | |
2821 | cqr->retries = 255; | |
2822 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
eb6e199b | 2823 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 SW |
2824 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
2825 | flags); | |
2826 | goto restart; | |
2827 | } | |
2828 | ||
2829 | /* Process finished ERP request. */ | |
2830 | if (cqr->refers) { | |
eb6e199b | 2831 | __dasd_process_erp(base, cqr); |
8e09f215 SW |
2832 | goto restart; |
2833 | } | |
2834 | ||
2835 | /* Rechain finished requests to final queue */ | |
1aae0560 | 2836 | cqr->endclk = get_tod_clock(); |
8e09f215 SW |
2837 | list_move_tail(&cqr->blocklist, final_queue); |
2838 | } | |
2839 | } | |
2840 | ||
2841 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
2842 | { | |
2843 | dasd_schedule_block_bh(cqr->block); | |
2844 | } | |
2845 | ||
2846 | static void __dasd_block_start_head(struct dasd_block *block) | |
2847 | { | |
2848 | struct dasd_ccw_req *cqr; | |
2849 | ||
2850 | if (list_empty(&block->ccw_queue)) | |
2851 | return; | |
2852 | /* We allways begin with the first requests on the queue, as some | |
2853 | * of previously started requests have to be enqueued on a | |
2854 | * dasd_device again for error recovery. | |
2855 | */ | |
2856 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
2857 | if (cqr->status != DASD_CQR_FILLED) | |
2858 | continue; | |
5a27e60d SW |
2859 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && |
2860 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2861 | cqr->status = DASD_CQR_FAILED; | |
2862 | cqr->intrc = -EPERM; | |
2863 | dasd_schedule_block_bh(block); | |
2864 | continue; | |
2865 | } | |
8e09f215 SW |
2866 | /* Non-temporary stop condition will trigger fail fast */ |
2867 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
2868 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2869 | (!dasd_eer_enabled(block->base))) { | |
2870 | cqr->status = DASD_CQR_FAILED; | |
d1ffc1f8 | 2871 | cqr->intrc = -ENOLINK; |
8e09f215 SW |
2872 | dasd_schedule_block_bh(block); |
2873 | continue; | |
2874 | } | |
2875 | /* Don't try to start requests if device is stopped */ | |
2876 | if (block->base->stopped) | |
2877 | return; | |
2878 | ||
2879 | /* just a fail safe check, should not happen */ | |
2880 | if (!cqr->startdev) | |
2881 | cqr->startdev = block->base; | |
2882 | ||
2883 | /* make sure that the requests we submit find their way back */ | |
2884 | cqr->callback = dasd_return_cqr_cb; | |
2885 | ||
2886 | dasd_add_request_tail(cqr); | |
2887 | } | |
2888 | } | |
2889 | ||
2890 | /* | |
2891 | * Central dasd_block layer routine. Takes requests from the generic | |
2892 | * block layer request queue, creates ccw requests, enqueues them on | |
2893 | * a dasd_device and processes ccw requests that have been returned. | |
2894 | */ | |
2895 | static void dasd_block_tasklet(struct dasd_block *block) | |
2896 | { | |
2897 | struct list_head final_queue; | |
2898 | struct list_head *l, *n; | |
2899 | struct dasd_ccw_req *cqr; | |
2900 | ||
2901 | atomic_set(&block->tasklet_scheduled, 0); | |
2902 | INIT_LIST_HEAD(&final_queue); | |
2903 | spin_lock(&block->queue_lock); | |
2904 | /* Finish off requests on ccw queue */ | |
2905 | __dasd_process_block_ccw_queue(block, &final_queue); | |
2906 | spin_unlock(&block->queue_lock); | |
2907 | /* Now call the callback function of requests with final status */ | |
2908 | spin_lock_irq(&block->request_queue_lock); | |
2909 | list_for_each_safe(l, n, &final_queue) { | |
2910 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2911 | list_del_init(&cqr->blocklist); | |
2912 | __dasd_cleanup_cqr(cqr); | |
2913 | } | |
2914 | spin_lock(&block->queue_lock); | |
2915 | /* Get new request from the block device request queue */ | |
2916 | __dasd_process_request_queue(block); | |
2917 | /* Now check if the head of the ccw queue needs to be started. */ | |
2918 | __dasd_block_start_head(block); | |
2919 | spin_unlock(&block->queue_lock); | |
2920 | spin_unlock_irq(&block->request_queue_lock); | |
4679e893 SH |
2921 | if (waitqueue_active(&shutdown_waitq)) |
2922 | wake_up(&shutdown_waitq); | |
8e09f215 SW |
2923 | dasd_put_device(block->base); |
2924 | } | |
2925 | ||
2926 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
2927 | { | |
2928 | wake_up(&dasd_flush_wq); | |
2929 | } | |
2930 | ||
c5576876 SH |
2931 | /* |
2932 | * Requeue a request back to the block request queue | |
2933 | * only works for block requests | |
2934 | */ | |
2935 | static int _dasd_requeue_request(struct dasd_ccw_req *cqr) | |
2936 | { | |
2937 | struct dasd_block *block = cqr->block; | |
2938 | struct request *req; | |
2939 | unsigned long flags; | |
2940 | ||
2941 | if (!block) | |
2942 | return -EINVAL; | |
a521b048 | 2943 | spin_lock_irqsave(&block->request_queue_lock, flags); |
c5576876 SH |
2944 | req = (struct request *) cqr->callback_data; |
2945 | blk_requeue_request(block->request_queue, req); | |
a521b048 | 2946 | spin_unlock_irqrestore(&block->request_queue_lock, flags); |
c5576876 SH |
2947 | |
2948 | return 0; | |
2949 | } | |
2950 | ||
8e09f215 SW |
2951 | /* |
2952 | * Go through all request on the dasd_block request queue, cancel them | |
2953 | * on the respective dasd_device, and return them to the generic | |
2954 | * block layer. | |
2955 | */ | |
2956 | static int dasd_flush_block_queue(struct dasd_block *block) | |
2957 | { | |
2958 | struct dasd_ccw_req *cqr, *n; | |
2959 | int rc, i; | |
2960 | struct list_head flush_queue; | |
2961 | ||
2962 | INIT_LIST_HEAD(&flush_queue); | |
2963 | spin_lock_bh(&block->queue_lock); | |
2964 | rc = 0; | |
2965 | restart: | |
2966 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
2967 | /* if this request currently owned by a dasd_device cancel it */ | |
2968 | if (cqr->status >= DASD_CQR_QUEUED) | |
2969 | rc = dasd_cancel_req(cqr); | |
2970 | if (rc < 0) | |
2971 | break; | |
2972 | /* Rechain request (including erp chain) so it won't be | |
2973 | * touched by the dasd_block_tasklet anymore. | |
2974 | * Replace the callback so we notice when the request | |
2975 | * is returned from the dasd_device layer. | |
2976 | */ | |
2977 | cqr->callback = _dasd_wake_block_flush_cb; | |
2978 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
2979 | list_move_tail(&cqr->blocklist, &flush_queue); | |
2980 | if (i > 1) | |
2981 | /* moved more than one request - need to restart */ | |
2982 | goto restart; | |
2983 | } | |
2984 | spin_unlock_bh(&block->queue_lock); | |
2985 | /* Now call the callback function of flushed requests */ | |
2986 | restart_cb: | |
2987 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
2988 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
2989 | /* Process finished ERP request. */ | |
2990 | if (cqr->refers) { | |
0cd4bd47 | 2991 | spin_lock_bh(&block->queue_lock); |
eb6e199b | 2992 | __dasd_process_erp(block->base, cqr); |
0cd4bd47 | 2993 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
2994 | /* restart list_for_xx loop since dasd_process_erp |
2995 | * might remove multiple elements */ | |
2996 | goto restart_cb; | |
2997 | } | |
2998 | /* call the callback function */ | |
0cd4bd47 | 2999 | spin_lock_irq(&block->request_queue_lock); |
1aae0560 | 3000 | cqr->endclk = get_tod_clock(); |
8e09f215 SW |
3001 | list_del_init(&cqr->blocklist); |
3002 | __dasd_cleanup_cqr(cqr); | |
0cd4bd47 | 3003 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 | 3004 | } |
1da177e4 LT |
3005 | return rc; |
3006 | } | |
3007 | ||
3008 | /* | |
8e09f215 SW |
3009 | * Schedules a call to dasd_tasklet over the device tasklet. |
3010 | */ | |
3011 | void dasd_schedule_block_bh(struct dasd_block *block) | |
3012 | { | |
3013 | /* Protect against rescheduling. */ | |
3014 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
3015 | return; | |
3016 | /* life cycle of block is bound to it's base device */ | |
3017 | dasd_get_device(block->base); | |
3018 | tasklet_hi_schedule(&block->tasklet); | |
3019 | } | |
7048a2b5 | 3020 | EXPORT_SYMBOL(dasd_schedule_block_bh); |
8e09f215 SW |
3021 | |
3022 | ||
3023 | /* | |
3024 | * SECTION: external block device operations | |
3025 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
3026 | */ |
3027 | ||
3028 | /* | |
3029 | * Dasd request queue function. Called from ll_rw_blk.c | |
3030 | */ | |
8e09f215 | 3031 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 3032 | { |
8e09f215 | 3033 | struct dasd_block *block; |
1da177e4 | 3034 | |
8e09f215 SW |
3035 | block = queue->queuedata; |
3036 | spin_lock(&block->queue_lock); | |
1da177e4 | 3037 | /* Get new request from the block device request queue */ |
8e09f215 | 3038 | __dasd_process_request_queue(block); |
1da177e4 | 3039 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
3040 | __dasd_block_start_head(block); |
3041 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
3042 | } |
3043 | ||
a2ace466 HR |
3044 | /* |
3045 | * Block timeout callback, called from the block layer | |
3046 | * | |
3047 | * request_queue lock is held on entry. | |
3048 | * | |
3049 | * Return values: | |
3050 | * BLK_EH_RESET_TIMER if the request should be left running | |
3051 | * BLK_EH_NOT_HANDLED if the request is handled or terminated | |
3052 | * by the driver. | |
3053 | */ | |
3054 | enum blk_eh_timer_return dasd_times_out(struct request *req) | |
3055 | { | |
3056 | struct dasd_ccw_req *cqr = req->completion_data; | |
3057 | struct dasd_block *block = req->q->queuedata; | |
3058 | struct dasd_device *device; | |
3059 | int rc = 0; | |
3060 | ||
3061 | if (!cqr) | |
3062 | return BLK_EH_NOT_HANDLED; | |
3063 | ||
3064 | device = cqr->startdev ? cqr->startdev : block->base; | |
3d71ad32 HR |
3065 | if (!device->blk_timeout) |
3066 | return BLK_EH_RESET_TIMER; | |
a2ace466 HR |
3067 | DBF_DEV_EVENT(DBF_WARNING, device, |
3068 | " dasd_times_out cqr %p status %x", | |
3069 | cqr, cqr->status); | |
3070 | ||
3071 | spin_lock(&block->queue_lock); | |
3072 | spin_lock(get_ccwdev_lock(device->cdev)); | |
3073 | cqr->retries = -1; | |
3074 | cqr->intrc = -ETIMEDOUT; | |
3075 | if (cqr->status >= DASD_CQR_QUEUED) { | |
3076 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
3077 | rc = dasd_cancel_req(cqr); | |
3078 | } else if (cqr->status == DASD_CQR_FILLED || | |
3079 | cqr->status == DASD_CQR_NEED_ERP) { | |
3080 | cqr->status = DASD_CQR_TERMINATED; | |
3081 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
3082 | } else if (cqr->status == DASD_CQR_IN_ERP) { | |
3083 | struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr; | |
3084 | ||
3085 | list_for_each_entry_safe(searchcqr, nextcqr, | |
3086 | &block->ccw_queue, blocklist) { | |
3087 | tmpcqr = searchcqr; | |
3088 | while (tmpcqr->refers) | |
3089 | tmpcqr = tmpcqr->refers; | |
3090 | if (tmpcqr != cqr) | |
3091 | continue; | |
3092 | /* searchcqr is an ERP request for cqr */ | |
3093 | searchcqr->retries = -1; | |
3094 | searchcqr->intrc = -ETIMEDOUT; | |
3095 | if (searchcqr->status >= DASD_CQR_QUEUED) { | |
3096 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
3097 | rc = dasd_cancel_req(searchcqr); | |
3098 | spin_lock(get_ccwdev_lock(device->cdev)); | |
3099 | } else if ((searchcqr->status == DASD_CQR_FILLED) || | |
3100 | (searchcqr->status == DASD_CQR_NEED_ERP)) { | |
3101 | searchcqr->status = DASD_CQR_TERMINATED; | |
3102 | rc = 0; | |
3103 | } else if (searchcqr->status == DASD_CQR_IN_ERP) { | |
3104 | /* | |
3105 | * Shouldn't happen; most recent ERP | |
3106 | * request is at the front of queue | |
3107 | */ | |
3108 | continue; | |
3109 | } | |
3110 | break; | |
3111 | } | |
3112 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
3113 | } | |
3114 | dasd_schedule_block_bh(block); | |
3115 | spin_unlock(&block->queue_lock); | |
3116 | ||
3117 | return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED; | |
3118 | } | |
3119 | ||
1da177e4 LT |
3120 | /* |
3121 | * Allocate and initialize request queue and default I/O scheduler. | |
3122 | */ | |
8e09f215 | 3123 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 | 3124 | { |
8e09f215 SW |
3125 | block->request_queue = blk_init_queue(do_dasd_request, |
3126 | &block->request_queue_lock); | |
3127 | if (block->request_queue == NULL) | |
1da177e4 LT |
3128 | return -ENOMEM; |
3129 | ||
8e09f215 | 3130 | block->request_queue->queuedata = block; |
1da177e4 | 3131 | |
a5fd8ddc | 3132 | return 0; |
1da177e4 LT |
3133 | } |
3134 | ||
3135 | /* | |
3136 | * Allocate and initialize request queue. | |
3137 | */ | |
8e09f215 | 3138 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 | 3139 | { |
62ba6f85 | 3140 | struct request_queue *q = block->request_queue; |
1da177e4 LT |
3141 | int max; |
3142 | ||
e4dbb0f2 SH |
3143 | if (block->base->features & DASD_FEATURE_USERAW) { |
3144 | /* | |
3145 | * the max_blocks value for raw_track access is 256 | |
3146 | * it is higher than the native ECKD value because we | |
3147 | * only need one ccw per track | |
3148 | * so the max_hw_sectors are | |
3149 | * 2048 x 512B = 1024kB = 16 tracks | |
3150 | */ | |
3151 | max = 2048; | |
3152 | } else { | |
3153 | max = block->base->discipline->max_blocks << block->s2b_shift; | |
3154 | } | |
62ba6f85 JH |
3155 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
3156 | q->limits.max_dev_sectors = max; | |
3157 | blk_queue_logical_block_size(q, block->bp_block); | |
3158 | blk_queue_max_hw_sectors(q, max); | |
3159 | blk_queue_max_segments(q, USHRT_MAX); | |
f3eb5384 SW |
3160 | /* with page sized segments we can translate each segement into |
3161 | * one idaw/tidaw | |
3162 | */ | |
62ba6f85 JH |
3163 | blk_queue_max_segment_size(q, PAGE_SIZE); |
3164 | blk_queue_segment_boundary(q, PAGE_SIZE - 1); | |
1da177e4 LT |
3165 | } |
3166 | ||
3167 | /* | |
3168 | * Deactivate and free request queue. | |
3169 | */ | |
8e09f215 | 3170 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 3171 | { |
8e09f215 SW |
3172 | if (block->request_queue) { |
3173 | blk_cleanup_queue(block->request_queue); | |
3174 | block->request_queue = NULL; | |
1da177e4 LT |
3175 | } |
3176 | } | |
3177 | ||
3178 | /* | |
3179 | * Flush request on the request queue. | |
3180 | */ | |
8e09f215 | 3181 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
3182 | { |
3183 | struct request *req; | |
3184 | ||
8e09f215 | 3185 | if (!block->request_queue) |
1da177e4 | 3186 | return; |
138c014d | 3187 | |
8e09f215 | 3188 | spin_lock_irq(&block->request_queue_lock); |
9934c8c0 | 3189 | while ((req = blk_fetch_request(block->request_queue))) |
40cbbb78 | 3190 | __blk_end_request_all(req, -EIO); |
8e09f215 | 3191 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
3192 | } |
3193 | ||
57a7c0bc | 3194 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 3195 | { |
9eb25122 | 3196 | struct dasd_device *base; |
1da177e4 LT |
3197 | int rc; |
3198 | ||
65f8da47 SW |
3199 | base = dasd_device_from_gendisk(bdev->bd_disk); |
3200 | if (!base) | |
9eb25122 SH |
3201 | return -ENODEV; |
3202 | ||
65f8da47 | 3203 | atomic_inc(&base->block->open_count); |
8e09f215 | 3204 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { |
1da177e4 LT |
3205 | rc = -ENODEV; |
3206 | goto unlock; | |
3207 | } | |
3208 | ||
8e09f215 | 3209 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
3210 | rc = -EINVAL; |
3211 | goto unlock; | |
3212 | } | |
3213 | ||
3214 | if (dasd_probeonly) { | |
fc19f381 SH |
3215 | dev_info(&base->cdev->dev, |
3216 | "Accessing the DASD failed because it is in " | |
3217 | "probeonly mode\n"); | |
1da177e4 LT |
3218 | rc = -EPERM; |
3219 | goto out; | |
3220 | } | |
3221 | ||
8e09f215 SW |
3222 | if (base->state <= DASD_STATE_BASIC) { |
3223 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
3224 | " Cannot open unrecognized device"); |
3225 | rc = -ENODEV; | |
3226 | goto out; | |
3227 | } | |
3228 | ||
33b62a30 SW |
3229 | if ((mode & FMODE_WRITE) && |
3230 | (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || | |
3231 | (base->features & DASD_FEATURE_READONLY))) { | |
3232 | rc = -EROFS; | |
3233 | goto out; | |
3234 | } | |
3235 | ||
65f8da47 | 3236 | dasd_put_device(base); |
1da177e4 LT |
3237 | return 0; |
3238 | ||
3239 | out: | |
8e09f215 | 3240 | module_put(base->discipline->owner); |
1da177e4 | 3241 | unlock: |
65f8da47 SW |
3242 | atomic_dec(&base->block->open_count); |
3243 | dasd_put_device(base); | |
1da177e4 LT |
3244 | return rc; |
3245 | } | |
3246 | ||
db2a144b | 3247 | static void dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 3248 | { |
db2a144b AV |
3249 | struct dasd_device *base = dasd_device_from_gendisk(disk); |
3250 | if (base) { | |
3251 | atomic_dec(&base->block->open_count); | |
3252 | module_put(base->discipline->owner); | |
3253 | dasd_put_device(base); | |
3254 | } | |
1da177e4 LT |
3255 | } |
3256 | ||
a885c8c4 CH |
3257 | /* |
3258 | * Return disk geometry. | |
3259 | */ | |
8e09f215 | 3260 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 3261 | { |
8e09f215 | 3262 | struct dasd_device *base; |
a885c8c4 | 3263 | |
65f8da47 SW |
3264 | base = dasd_device_from_gendisk(bdev->bd_disk); |
3265 | if (!base) | |
a885c8c4 CH |
3266 | return -ENODEV; |
3267 | ||
8e09f215 | 3268 | if (!base->discipline || |
65f8da47 SW |
3269 | !base->discipline->fill_geometry) { |
3270 | dasd_put_device(base); | |
a885c8c4 | 3271 | return -EINVAL; |
65f8da47 SW |
3272 | } |
3273 | base->discipline->fill_geometry(base->block, geo); | |
3274 | geo->start = get_start_sect(bdev) >> base->block->s2b_shift; | |
3275 | dasd_put_device(base); | |
a885c8c4 CH |
3276 | return 0; |
3277 | } | |
3278 | ||
83d5cde4 | 3279 | const struct block_device_operations |
1da177e4 LT |
3280 | dasd_device_operations = { |
3281 | .owner = THIS_MODULE, | |
57a7c0bc AV |
3282 | .open = dasd_open, |
3283 | .release = dasd_release, | |
0000d031 HC |
3284 | .ioctl = dasd_ioctl, |
3285 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 3286 | .getgeo = dasd_getgeo, |
1da177e4 LT |
3287 | }; |
3288 | ||
8e09f215 SW |
3289 | /******************************************************************************* |
3290 | * end of block device operations | |
3291 | */ | |
1da177e4 LT |
3292 | |
3293 | static void | |
3294 | dasd_exit(void) | |
3295 | { | |
3296 | #ifdef CONFIG_PROC_FS | |
3297 | dasd_proc_exit(); | |
3298 | #endif | |
20c64468 | 3299 | dasd_eer_exit(); |
6bb0e010 HH |
3300 | if (dasd_page_cache != NULL) { |
3301 | kmem_cache_destroy(dasd_page_cache); | |
3302 | dasd_page_cache = NULL; | |
3303 | } | |
1da177e4 LT |
3304 | dasd_gendisk_exit(); |
3305 | dasd_devmap_exit(); | |
1da177e4 LT |
3306 | if (dasd_debug_area != NULL) { |
3307 | debug_unregister(dasd_debug_area); | |
3308 | dasd_debug_area = NULL; | |
3309 | } | |
4fa52aa7 | 3310 | dasd_statistics_removeroot(); |
1da177e4 LT |
3311 | } |
3312 | ||
3313 | /* | |
3314 | * SECTION: common functions for ccw_driver use | |
3315 | */ | |
3316 | ||
33b62a30 SW |
3317 | /* |
3318 | * Is the device read-only? | |
3319 | * Note that this function does not report the setting of the | |
3320 | * readonly device attribute, but how it is configured in z/VM. | |
3321 | */ | |
3322 | int dasd_device_is_ro(struct dasd_device *device) | |
3323 | { | |
3324 | struct ccw_dev_id dev_id; | |
3325 | struct diag210 diag_data; | |
3326 | int rc; | |
3327 | ||
3328 | if (!MACHINE_IS_VM) | |
3329 | return 0; | |
3330 | ccw_device_get_id(device->cdev, &dev_id); | |
3331 | memset(&diag_data, 0, sizeof(diag_data)); | |
3332 | diag_data.vrdcdvno = dev_id.devno; | |
3333 | diag_data.vrdclen = sizeof(diag_data); | |
3334 | rc = diag210(&diag_data); | |
3335 | if (rc == 0 || rc == 2) { | |
3336 | return diag_data.vrdcvfla & 0x80; | |
3337 | } else { | |
3338 | DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", | |
3339 | dev_id.devno, rc); | |
3340 | return 0; | |
3341 | } | |
3342 | } | |
3343 | EXPORT_SYMBOL_GPL(dasd_device_is_ro); | |
3344 | ||
f3445a1a CH |
3345 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
3346 | { | |
3347 | struct ccw_device *cdev = data; | |
3348 | int ret; | |
3349 | ||
3350 | ret = ccw_device_set_online(cdev); | |
3351 | if (ret) | |
4ce25966 FF |
3352 | pr_warn("%s: Setting the DASD online failed with rc=%d\n", |
3353 | dev_name(&cdev->dev), ret); | |
f3445a1a CH |
3354 | } |
3355 | ||
1c01b8a5 HH |
3356 | /* |
3357 | * Initial attempt at a probe function. this can be simplified once | |
3358 | * the other detection code is gone. | |
3359 | */ | |
8e09f215 SW |
3360 | int dasd_generic_probe(struct ccw_device *cdev, |
3361 | struct dasd_discipline *discipline) | |
1da177e4 LT |
3362 | { |
3363 | int ret; | |
3364 | ||
3365 | ret = dasd_add_sysfs_files(cdev); | |
3366 | if (ret) { | |
b8ed5dd5 SH |
3367 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", |
3368 | "dasd_generic_probe: could not add " | |
3369 | "sysfs entries"); | |
40545573 | 3370 | return ret; |
1da177e4 | 3371 | } |
40545573 | 3372 | cdev->handler = &dasd_int_handler; |
1da177e4 | 3373 | |
40545573 HH |
3374 | /* |
3375 | * Automatically online either all dasd devices (dasd_autodetect) | |
3376 | * or all devices specified with dasd= parameters during | |
3377 | * initial probe. | |
3378 | */ | |
3379 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 3380 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 3381 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 3382 | return 0; |
1da177e4 | 3383 | } |
7048a2b5 | 3384 | EXPORT_SYMBOL_GPL(dasd_generic_probe); |
1da177e4 | 3385 | |
c020d722 SH |
3386 | void dasd_generic_free_discipline(struct dasd_device *device) |
3387 | { | |
3388 | /* Forget the discipline information. */ | |
3389 | if (device->discipline) { | |
3390 | if (device->discipline->uncheck_device) | |
3391 | device->discipline->uncheck_device(device); | |
3392 | module_put(device->discipline->owner); | |
3393 | device->discipline = NULL; | |
3394 | } | |
3395 | if (device->base_discipline) { | |
3396 | module_put(device->base_discipline->owner); | |
3397 | device->base_discipline = NULL; | |
3398 | } | |
3399 | } | |
3400 | EXPORT_SYMBOL_GPL(dasd_generic_free_discipline); | |
3401 | ||
1c01b8a5 HH |
3402 | /* |
3403 | * This will one day be called from a global not_oper handler. | |
3404 | * It is also used by driver_unregister during module unload. | |
3405 | */ | |
8e09f215 | 3406 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
3407 | { |
3408 | struct dasd_device *device; | |
8e09f215 | 3409 | struct dasd_block *block; |
1da177e4 | 3410 | |
59afda78 HH |
3411 | cdev->handler = NULL; |
3412 | ||
1da177e4 | 3413 | device = dasd_device_from_cdev(cdev); |
be4904e5 SW |
3414 | if (IS_ERR(device)) { |
3415 | dasd_remove_sysfs_files(cdev); | |
1da177e4 | 3416 | return; |
be4904e5 | 3417 | } |
d07dc5d8 SH |
3418 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) && |
3419 | !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
1da177e4 LT |
3420 | /* Already doing offline processing */ |
3421 | dasd_put_device(device); | |
be4904e5 | 3422 | dasd_remove_sysfs_files(cdev); |
1da177e4 LT |
3423 | return; |
3424 | } | |
3425 | /* | |
3426 | * This device is removed unconditionally. Set offline | |
3427 | * flag to prevent dasd_open from opening it while it is | |
3428 | * no quite down yet. | |
3429 | */ | |
3430 | dasd_set_target_state(device, DASD_STATE_NEW); | |
3431 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 | 3432 | block = device->block; |
1da177e4 | 3433 | dasd_delete_device(device); |
8e09f215 SW |
3434 | /* |
3435 | * life cycle of block is bound to device, so delete it after | |
3436 | * device was safely removed | |
3437 | */ | |
3438 | if (block) | |
3439 | dasd_free_block(block); | |
d07dc5d8 SH |
3440 | |
3441 | dasd_remove_sysfs_files(cdev); | |
1da177e4 | 3442 | } |
7048a2b5 | 3443 | EXPORT_SYMBOL_GPL(dasd_generic_remove); |
1da177e4 | 3444 | |
1c01b8a5 HH |
3445 | /* |
3446 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 3447 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
3448 | * or the user has started activation through sysfs. |
3449 | */ | |
8e09f215 SW |
3450 | int dasd_generic_set_online(struct ccw_device *cdev, |
3451 | struct dasd_discipline *base_discipline) | |
1da177e4 | 3452 | { |
aa88861f | 3453 | struct dasd_discipline *discipline; |
1da177e4 | 3454 | struct dasd_device *device; |
c6eb7b77 | 3455 | int rc; |
f24acd45 | 3456 | |
40545573 HH |
3457 | /* first online clears initial online feature flag */ |
3458 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
3459 | device = dasd_create_device(cdev); |
3460 | if (IS_ERR(device)) | |
3461 | return PTR_ERR(device); | |
3462 | ||
aa88861f | 3463 | discipline = base_discipline; |
c6eb7b77 | 3464 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 3465 | if (!dasd_diag_discipline_pointer) { |
7c53fcb3 PO |
3466 | /* Try to load the required module. */ |
3467 | rc = request_module(DASD_DIAG_MOD); | |
3468 | if (rc) { | |
3469 | pr_warn("%s Setting the DASD online failed " | |
3470 | "because the required module %s " | |
3471 | "could not be loaded (rc=%d)\n", | |
3472 | dev_name(&cdev->dev), DASD_DIAG_MOD, | |
3473 | rc); | |
3474 | dasd_delete_device(device); | |
3475 | return -ENODEV; | |
3476 | } | |
3477 | } | |
3478 | /* Module init could have failed, so check again here after | |
3479 | * request_module(). */ | |
3480 | if (!dasd_diag_discipline_pointer) { | |
4ce25966 FF |
3481 | pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n", |
3482 | dev_name(&cdev->dev)); | |
1da177e4 LT |
3483 | dasd_delete_device(device); |
3484 | return -ENODEV; | |
3485 | } | |
3486 | discipline = dasd_diag_discipline_pointer; | |
3487 | } | |
aa88861f PO |
3488 | if (!try_module_get(base_discipline->owner)) { |
3489 | dasd_delete_device(device); | |
3490 | return -EINVAL; | |
3491 | } | |
3492 | if (!try_module_get(discipline->owner)) { | |
3493 | module_put(base_discipline->owner); | |
3494 | dasd_delete_device(device); | |
3495 | return -EINVAL; | |
3496 | } | |
3497 | device->base_discipline = base_discipline; | |
1da177e4 LT |
3498 | device->discipline = discipline; |
3499 | ||
8e09f215 | 3500 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
3501 | rc = discipline->check_device(device); |
3502 | if (rc) { | |
4ce25966 FF |
3503 | pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n", |
3504 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
3505 | module_put(discipline->owner); |
3506 | module_put(base_discipline->owner); | |
1da177e4 LT |
3507 | dasd_delete_device(device); |
3508 | return rc; | |
3509 | } | |
3510 | ||
3511 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
3512 | if (device->state <= DASD_STATE_KNOWN) { | |
4ce25966 FF |
3513 | pr_warn("%s Setting the DASD online failed because of a missing discipline\n", |
3514 | dev_name(&cdev->dev)); | |
1da177e4 LT |
3515 | rc = -ENODEV; |
3516 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
3517 | if (device->block) |
3518 | dasd_free_block(device->block); | |
1da177e4 LT |
3519 | dasd_delete_device(device); |
3520 | } else | |
3521 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 3522 | dev_name(&cdev->dev)); |
589c74d5 SH |
3523 | |
3524 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
3525 | ||
1da177e4 | 3526 | dasd_put_device(device); |
1da177e4 LT |
3527 | return rc; |
3528 | } | |
7048a2b5 | 3529 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); |
1da177e4 | 3530 | |
8e09f215 | 3531 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
3532 | { |
3533 | struct dasd_device *device; | |
8e09f215 | 3534 | struct dasd_block *block; |
d07dc5d8 | 3535 | int max_count, open_count, rc; |
0f57c97f | 3536 | unsigned long flags; |
1da177e4 | 3537 | |
d07dc5d8 | 3538 | rc = 0; |
0f57c97f JH |
3539 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
3540 | device = dasd_device_from_cdev_locked(cdev); | |
3541 | if (IS_ERR(device)) { | |
3542 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1da177e4 | 3543 | return PTR_ERR(device); |
0f57c97f | 3544 | } |
d07dc5d8 | 3545 | |
1da177e4 LT |
3546 | /* |
3547 | * We must make sure that this device is currently not in use. | |
3548 | * The open_count is increased for every opener, that includes | |
3549 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
3550 | * in the other openers. | |
3551 | */ | |
8e09f215 | 3552 | if (device->block) { |
a806170e HC |
3553 | max_count = device->block->bdev ? 0 : -1; |
3554 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
3555 | if (open_count > max_count) { |
3556 | if (open_count > 0) | |
4ce25966 FF |
3557 | pr_warn("%s: The DASD cannot be set offline with open count %i\n", |
3558 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 3559 | else |
4ce25966 FF |
3560 | pr_warn("%s: The DASD cannot be set offline while it is in use\n", |
3561 | dev_name(&cdev->dev)); | |
8e09f215 | 3562 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); |
0f57c97f | 3563 | goto out_busy; |
8e09f215 | 3564 | } |
1da177e4 | 3565 | } |
d07dc5d8 SH |
3566 | |
3567 | if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
3568 | /* | |
b4a96015 | 3569 | * safe offline already running |
d07dc5d8 SH |
3570 | * could only be called by normal offline so safe_offline flag |
3571 | * needs to be removed to run normal offline and kill all I/O | |
3572 | */ | |
0f57c97f | 3573 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) |
d07dc5d8 | 3574 | /* Already doing normal offline processing */ |
0f57c97f JH |
3575 | goto out_busy; |
3576 | else | |
d07dc5d8 | 3577 | clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); |
0f57c97f JH |
3578 | } else { |
3579 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) | |
d07dc5d8 | 3580 | /* Already doing offline processing */ |
0f57c97f JH |
3581 | goto out_busy; |
3582 | } | |
3583 | ||
3584 | set_bit(DASD_FLAG_OFFLINE, &device->flags); | |
3585 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
d07dc5d8 SH |
3586 | |
3587 | /* | |
3588 | * if safe_offline called set safe_offline_running flag and | |
3589 | * clear safe_offline so that a call to normal offline | |
3590 | * can overrun safe_offline processing | |
3591 | */ | |
3592 | if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) && | |
3593 | !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
3594 | /* | |
3595 | * If we want to set the device safe offline all IO operations | |
3596 | * should be finished before continuing the offline process | |
3597 | * so sync bdev first and then wait for our queues to become | |
3598 | * empty | |
3599 | */ | |
3600 | /* sync blockdev and partitions */ | |
3601 | rc = fsync_bdev(device->block->bdev); | |
3602 | if (rc != 0) | |
3603 | goto interrupted; | |
3604 | ||
3605 | /* schedule device tasklet and wait for completion */ | |
3606 | dasd_schedule_device_bh(device); | |
3607 | rc = wait_event_interruptible(shutdown_waitq, | |
3608 | _wait_for_empty_queues(device)); | |
3609 | if (rc != 0) | |
3610 | goto interrupted; | |
3611 | } | |
3612 | ||
1da177e4 LT |
3613 | dasd_set_target_state(device, DASD_STATE_NEW); |
3614 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 | 3615 | block = device->block; |
1da177e4 | 3616 | dasd_delete_device(device); |
8e09f215 SW |
3617 | /* |
3618 | * life cycle of block is bound to device, so delete it after | |
3619 | * device was safely removed | |
3620 | */ | |
3621 | if (block) | |
3622 | dasd_free_block(block); | |
1da177e4 | 3623 | return 0; |
d07dc5d8 SH |
3624 | |
3625 | interrupted: | |
3626 | /* interrupted by signal */ | |
3627 | clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); | |
3628 | clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); | |
3629 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); | |
3630 | dasd_put_device(device); | |
0f57c97f | 3631 | |
d07dc5d8 | 3632 | return rc; |
0f57c97f JH |
3633 | |
3634 | out_busy: | |
3635 | dasd_put_device(device); | |
3636 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
3637 | ||
3638 | return -EBUSY; | |
1da177e4 | 3639 | } |
7048a2b5 | 3640 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); |
1da177e4 | 3641 | |
a4d26c6a SW |
3642 | int dasd_generic_last_path_gone(struct dasd_device *device) |
3643 | { | |
3644 | struct dasd_ccw_req *cqr; | |
3645 | ||
3646 | dev_warn(&device->cdev->dev, "No operational channel path is left " | |
3647 | "for the device\n"); | |
3648 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); | |
3649 | /* First of all call extended error reporting. */ | |
3650 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
3651 | ||
3652 | if (device->state < DASD_STATE_BASIC) | |
3653 | return 0; | |
3654 | /* Device is active. We want to keep it. */ | |
3655 | list_for_each_entry(cqr, &device->ccw_queue, devlist) | |
3656 | if ((cqr->status == DASD_CQR_IN_IO) || | |
3657 | (cqr->status == DASD_CQR_CLEAR_PENDING)) { | |
3658 | cqr->status = DASD_CQR_QUEUED; | |
3659 | cqr->retries++; | |
3660 | } | |
3661 | dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); | |
3662 | dasd_device_clear_timer(device); | |
3663 | dasd_schedule_device_bh(device); | |
3664 | return 1; | |
3665 | } | |
3666 | EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); | |
3667 | ||
3668 | int dasd_generic_path_operational(struct dasd_device *device) | |
3669 | { | |
3670 | dev_info(&device->cdev->dev, "A channel path to the device has become " | |
3671 | "operational\n"); | |
3672 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); | |
3673 | dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); | |
3674 | if (device->stopped & DASD_UNRESUMED_PM) { | |
3675 | dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); | |
3676 | dasd_restore_device(device); | |
3677 | return 1; | |
3678 | } | |
3679 | dasd_schedule_device_bh(device); | |
3680 | if (device->block) | |
3681 | dasd_schedule_block_bh(device->block); | |
931a3dce SH |
3682 | |
3683 | if (!device->stopped) | |
3684 | wake_up(&generic_waitq); | |
3685 | ||
a4d26c6a SW |
3686 | return 1; |
3687 | } | |
3688 | EXPORT_SYMBOL_GPL(dasd_generic_path_operational); | |
3689 | ||
8e09f215 | 3690 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
3691 | { |
3692 | struct dasd_device *device; | |
1da177e4 LT |
3693 | int ret; |
3694 | ||
91c36919 | 3695 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
3696 | if (IS_ERR(device)) |
3697 | return 0; | |
1da177e4 LT |
3698 | ret = 0; |
3699 | switch (event) { | |
3700 | case CIO_GONE: | |
47593bfa | 3701 | case CIO_BOXED: |
1da177e4 | 3702 | case CIO_NO_PATH: |
c9346151 | 3703 | dasd_path_no_path(device); |
a4d26c6a | 3704 | ret = dasd_generic_last_path_gone(device); |
1da177e4 LT |
3705 | break; |
3706 | case CIO_OPER: | |
1da177e4 | 3707 | ret = 1; |
c9346151 | 3708 | if (dasd_path_get_opm(device)) |
a4d26c6a | 3709 | ret = dasd_generic_path_operational(device); |
1da177e4 LT |
3710 | break; |
3711 | } | |
1da177e4 LT |
3712 | dasd_put_device(device); |
3713 | return ret; | |
3714 | } | |
7048a2b5 | 3715 | EXPORT_SYMBOL_GPL(dasd_generic_notify); |
1da177e4 | 3716 | |
a4d26c6a SW |
3717 | void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) |
3718 | { | |
a4d26c6a | 3719 | struct dasd_device *device; |
a521b048 | 3720 | int chp, oldopm, hpfpm, ifccpm; |
a4d26c6a SW |
3721 | |
3722 | device = dasd_device_from_cdev_locked(cdev); | |
3723 | if (IS_ERR(device)) | |
3724 | return; | |
c9346151 SH |
3725 | |
3726 | oldopm = dasd_path_get_opm(device); | |
a4d26c6a | 3727 | for (chp = 0; chp < 8; chp++) { |
a4d26c6a | 3728 | if (path_event[chp] & PE_PATH_GONE) { |
c9346151 | 3729 | dasd_path_notoper(device, chp); |
a4d26c6a SW |
3730 | } |
3731 | if (path_event[chp] & PE_PATH_AVAILABLE) { | |
c9346151 | 3732 | dasd_path_available(device, chp); |
a4d26c6a SW |
3733 | dasd_schedule_device_bh(device); |
3734 | } | |
f1633031 | 3735 | if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { |
c9346151 SH |
3736 | if (!dasd_path_is_operational(device, chp) && |
3737 | !dasd_path_need_verify(device, chp)) { | |
12d7b107 SH |
3738 | /* |
3739 | * we can not establish a pathgroup on an | |
3740 | * unavailable path, so trigger a path | |
3741 | * verification first | |
3742 | */ | |
c9346151 SH |
3743 | dasd_path_available(device, chp); |
3744 | dasd_schedule_device_bh(device); | |
12d7b107 | 3745 | } |
f1633031 SH |
3746 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
3747 | "Pathgroup re-established\n"); | |
3748 | if (device->discipline->kick_validate) | |
3749 | device->discipline->kick_validate(device); | |
3750 | } | |
a4d26c6a | 3751 | } |
a521b048 SH |
3752 | hpfpm = dasd_path_get_hpfpm(device); |
3753 | ifccpm = dasd_path_get_ifccpm(device); | |
3754 | if (!dasd_path_get_opm(device) && hpfpm) { | |
3755 | /* | |
3756 | * device has no operational paths but at least one path is | |
3757 | * disabled due to HPF errors | |
3758 | * disable HPF at all and use the path(s) again | |
3759 | */ | |
3760 | if (device->discipline->disable_hpf) | |
3761 | device->discipline->disable_hpf(device); | |
3762 | dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC); | |
3763 | dasd_path_set_tbvpm(device, hpfpm); | |
3764 | dasd_schedule_device_bh(device); | |
3765 | dasd_schedule_requeue(device); | |
3766 | } else if (!dasd_path_get_opm(device) && ifccpm) { | |
3767 | /* | |
3768 | * device has no operational paths but at least one path is | |
3769 | * disabled due to IFCC errors | |
3770 | * trigger path verification on paths with IFCC errors | |
3771 | */ | |
3772 | dasd_path_set_tbvpm(device, ifccpm); | |
3773 | dasd_schedule_device_bh(device); | |
3774 | } | |
3775 | if (oldopm && !dasd_path_get_opm(device) && !hpfpm && !ifccpm) { | |
c9346151 SH |
3776 | dev_warn(&device->cdev->dev, |
3777 | "No verified channel paths remain for the device\n"); | |
3778 | DBF_DEV_EVENT(DBF_WARNING, device, | |
3779 | "%s", "last verified path gone"); | |
3780 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
3781 | dasd_device_set_stop_bits(device, | |
3782 | DASD_STOPPED_DC_WAIT); | |
3783 | } | |
a4d26c6a SW |
3784 | dasd_put_device(device); |
3785 | } | |
3786 | EXPORT_SYMBOL_GPL(dasd_generic_path_event); | |
3787 | ||
3788 | int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) | |
3789 | { | |
c9346151 SH |
3790 | if (!dasd_path_get_opm(device) && lpm) { |
3791 | dasd_path_set_opm(device, lpm); | |
a4d26c6a SW |
3792 | dasd_generic_path_operational(device); |
3793 | } else | |
c9346151 | 3794 | dasd_path_add_opm(device, lpm); |
a4d26c6a SW |
3795 | return 0; |
3796 | } | |
3797 | EXPORT_SYMBOL_GPL(dasd_generic_verify_path); | |
3798 | ||
a521b048 SH |
3799 | /* |
3800 | * clear active requests and requeue them to block layer if possible | |
3801 | */ | |
3802 | static int dasd_generic_requeue_all_requests(struct dasd_device *device) | |
d41dd122 | 3803 | { |
a521b048 | 3804 | struct list_head requeue_queue; |
d41dd122 | 3805 | struct dasd_ccw_req *cqr, *n; |
c5576876 | 3806 | struct dasd_ccw_req *refers; |
d41dd122 | 3807 | int rc; |
d41dd122 | 3808 | |
a521b048 SH |
3809 | INIT_LIST_HEAD(&requeue_queue); |
3810 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
d41dd122 SH |
3811 | rc = 0; |
3812 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { | |
3813 | /* Check status and move request to flush_queue */ | |
3814 | if (cqr->status == DASD_CQR_IN_IO) { | |
3815 | rc = device->discipline->term_IO(cqr); | |
3816 | if (rc) { | |
3817 | /* unable to terminate requeust */ | |
3818 | dev_err(&device->cdev->dev, | |
3819 | "Unable to terminate request %p " | |
3820 | "on suspend\n", cqr); | |
a521b048 | 3821 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
d41dd122 SH |
3822 | dasd_put_device(device); |
3823 | return rc; | |
3824 | } | |
3825 | } | |
a521b048 | 3826 | list_move_tail(&cqr->devlist, &requeue_queue); |
d41dd122 | 3827 | } |
a521b048 | 3828 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
d41dd122 | 3829 | |
a521b048 | 3830 | list_for_each_entry_safe(cqr, n, &requeue_queue, devlist) { |
d41dd122 SH |
3831 | wait_event(dasd_flush_wq, |
3832 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
c5576876 | 3833 | |
a521b048 SH |
3834 | /* mark sleepon requests as ended */ |
3835 | if (cqr->callback_data == DASD_SLEEPON_START_TAG) | |
3836 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
c5576876 SH |
3837 | |
3838 | /* remove requests from device and block queue */ | |
3839 | list_del_init(&cqr->devlist); | |
3840 | while (cqr->refers != NULL) { | |
3841 | refers = cqr->refers; | |
3842 | /* remove the request from the block queue */ | |
3843 | list_del(&cqr->blocklist); | |
3844 | /* free the finished erp request */ | |
3845 | dasd_free_erp_request(cqr, cqr->memdev); | |
3846 | cqr = refers; | |
3847 | } | |
a521b048 SH |
3848 | |
3849 | /* | |
3850 | * requeue requests to blocklayer will only work | |
3851 | * for block device requests | |
3852 | */ | |
3853 | if (_dasd_requeue_request(cqr)) | |
3854 | continue; | |
3855 | ||
c5576876 SH |
3856 | if (cqr->block) |
3857 | list_del_init(&cqr->blocklist); | |
3858 | cqr->block->base->discipline->free_cp( | |
3859 | cqr, (struct request *) cqr->callback_data); | |
d41dd122 | 3860 | } |
d41dd122 | 3861 | |
c5576876 SH |
3862 | /* |
3863 | * if requests remain then they are internal request | |
3864 | * and go back to the device queue | |
3865 | */ | |
a521b048 | 3866 | if (!list_empty(&requeue_queue)) { |
c5576876 | 3867 | /* move freeze_queue to start of the ccw_queue */ |
a521b048 SH |
3868 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
3869 | list_splice_tail(&requeue_queue, &device->ccw_queue); | |
3870 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
c5576876 | 3871 | } |
a521b048 SH |
3872 | /* wake up generic waitqueue for eventually ended sleepon requests */ |
3873 | wake_up(&generic_waitq); | |
d41dd122 SH |
3874 | return rc; |
3875 | } | |
a521b048 SH |
3876 | |
3877 | static void do_requeue_requests(struct work_struct *work) | |
3878 | { | |
3879 | struct dasd_device *device = container_of(work, struct dasd_device, | |
3880 | requeue_requests); | |
3881 | dasd_generic_requeue_all_requests(device); | |
3882 | dasd_device_remove_stop_bits(device, DASD_STOPPED_NOT_ACC); | |
3883 | if (device->block) | |
3884 | dasd_schedule_block_bh(device->block); | |
3885 | dasd_put_device(device); | |
3886 | } | |
3887 | ||
3888 | void dasd_schedule_requeue(struct dasd_device *device) | |
3889 | { | |
3890 | dasd_get_device(device); | |
3891 | /* queue call to dasd_reload_device to the kernel event daemon. */ | |
3892 | if (!schedule_work(&device->requeue_requests)) | |
3893 | dasd_put_device(device); | |
3894 | } | |
3895 | EXPORT_SYMBOL(dasd_schedule_requeue); | |
3896 | ||
3897 | int dasd_generic_pm_freeze(struct ccw_device *cdev) | |
3898 | { | |
3899 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
3900 | int rc; | |
3901 | ||
3902 | if (IS_ERR(device)) | |
3903 | return PTR_ERR(device); | |
3904 | ||
3905 | /* mark device as suspended */ | |
3906 | set_bit(DASD_FLAG_SUSPENDED, &device->flags); | |
3907 | ||
3908 | if (device->discipline->freeze) | |
3909 | rc = device->discipline->freeze(device); | |
3910 | ||
3911 | /* disallow new I/O */ | |
3912 | dasd_device_set_stop_bits(device, DASD_STOPPED_PM); | |
3913 | ||
3914 | return dasd_generic_requeue_all_requests(device); | |
3915 | } | |
d41dd122 SH |
3916 | EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); |
3917 | ||
3918 | int dasd_generic_restore_device(struct ccw_device *cdev) | |
3919 | { | |
3920 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
3921 | int rc = 0; | |
3922 | ||
3923 | if (IS_ERR(device)) | |
3924 | return PTR_ERR(device); | |
3925 | ||
e6125fba | 3926 | /* allow new IO again */ |
eb6e199b SW |
3927 | dasd_device_remove_stop_bits(device, |
3928 | (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); | |
e6125fba | 3929 | |
d41dd122 | 3930 | dasd_schedule_device_bh(device); |
d41dd122 | 3931 | |
eb6e199b SW |
3932 | /* |
3933 | * call discipline restore function | |
3934 | * if device is stopped do nothing e.g. for disconnected devices | |
3935 | */ | |
3936 | if (device->discipline->restore && !(device->stopped)) | |
d41dd122 | 3937 | rc = device->discipline->restore(device); |
eb6e199b | 3938 | if (rc || device->stopped) |
e6125fba SH |
3939 | /* |
3940 | * if the resume failed for the DASD we put it in | |
3941 | * an UNRESUMED stop state | |
3942 | */ | |
3943 | device->stopped |= DASD_UNRESUMED_PM; | |
d41dd122 | 3944 | |
6fca97a9 SH |
3945 | if (device->block) |
3946 | dasd_schedule_block_bh(device->block); | |
3947 | ||
c8d1c0ff | 3948 | clear_bit(DASD_FLAG_SUSPENDED, &device->flags); |
d41dd122 | 3949 | dasd_put_device(device); |
e6125fba | 3950 | return 0; |
d41dd122 SH |
3951 | } |
3952 | EXPORT_SYMBOL_GPL(dasd_generic_restore_device); | |
3953 | ||
763968e2 HC |
3954 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
3955 | void *rdc_buffer, | |
3956 | int rdc_buffer_size, | |
68b781fe | 3957 | int magic) |
17283b56 CH |
3958 | { |
3959 | struct dasd_ccw_req *cqr; | |
3960 | struct ccw1 *ccw; | |
d9fa9441 | 3961 | unsigned long *idaw; |
17283b56 CH |
3962 | |
3963 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
3964 | ||
3965 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
3966 | /* internal error 13 - Allocating the RDC request failed*/ |
3967 | dev_err(&device->cdev->dev, | |
3968 | "An error occurred in the DASD device driver, " | |
3969 | "reason=%s\n", "13"); | |
17283b56 CH |
3970 | return cqr; |
3971 | } | |
3972 | ||
3973 | ccw = cqr->cpaddr; | |
3974 | ccw->cmd_code = CCW_CMD_RDC; | |
d9fa9441 SH |
3975 | if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { |
3976 | idaw = (unsigned long *) (cqr->data); | |
3977 | ccw->cda = (__u32)(addr_t) idaw; | |
3978 | ccw->flags = CCW_FLAG_IDA; | |
3979 | idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); | |
3980 | } else { | |
3981 | ccw->cda = (__u32)(addr_t) rdc_buffer; | |
3982 | ccw->flags = 0; | |
3983 | } | |
17283b56 | 3984 | |
d9fa9441 | 3985 | ccw->count = rdc_buffer_size; |
8e09f215 SW |
3986 | cqr->startdev = device; |
3987 | cqr->memdev = device; | |
17283b56 | 3988 | cqr->expires = 10*HZ; |
eb6e199b | 3989 | cqr->retries = 256; |
1aae0560 | 3990 | cqr->buildclk = get_tod_clock(); |
17283b56 CH |
3991 | cqr->status = DASD_CQR_FILLED; |
3992 | return cqr; | |
3993 | } | |
3994 | ||
3995 | ||
68b781fe | 3996 | int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
92636b15 | 3997 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
3998 | { |
3999 | int ret; | |
4000 | struct dasd_ccw_req *cqr; | |
4001 | ||
92636b15 | 4002 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
4003 | magic); |
4004 | if (IS_ERR(cqr)) | |
4005 | return PTR_ERR(cqr); | |
4006 | ||
4007 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 4008 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
4009 | return ret; |
4010 | } | |
aaff0f64 | 4011 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 4012 | |
f3eb5384 SW |
4013 | /* |
4014 | * In command mode and transport mode we need to look for sense | |
4015 | * data in different places. The sense data itself is allways | |
4016 | * an array of 32 bytes, so we can unify the sense data access | |
4017 | * for both modes. | |
4018 | */ | |
4019 | char *dasd_get_sense(struct irb *irb) | |
4020 | { | |
4021 | struct tsb *tsb = NULL; | |
4022 | char *sense = NULL; | |
4023 | ||
4024 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
4025 | if (irb->scsw.tm.tcw) | |
4026 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
4027 | irb->scsw.tm.tcw); | |
4028 | if (tsb && tsb->length == 64 && tsb->flags) | |
4029 | switch (tsb->flags & 0x07) { | |
4030 | case 1: /* tsa_iostat */ | |
4031 | sense = tsb->tsa.iostat.sense; | |
4032 | break; | |
4033 | case 2: /* tsa_ddpc */ | |
4034 | sense = tsb->tsa.ddpc.sense; | |
4035 | break; | |
4036 | default: | |
4037 | /* currently we don't use interrogate data */ | |
4038 | break; | |
4039 | } | |
4040 | } else if (irb->esw.esw0.erw.cons) { | |
4041 | sense = irb->ecw; | |
4042 | } | |
4043 | return sense; | |
4044 | } | |
4045 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
4046 | ||
4679e893 SH |
4047 | void dasd_generic_shutdown(struct ccw_device *cdev) |
4048 | { | |
4049 | struct dasd_device *device; | |
4050 | ||
4051 | device = dasd_device_from_cdev(cdev); | |
4052 | if (IS_ERR(device)) | |
4053 | return; | |
4054 | ||
4055 | if (device->block) | |
4056 | dasd_schedule_block_bh(device->block); | |
4057 | ||
4058 | dasd_schedule_device_bh(device); | |
4059 | ||
4060 | wait_event(shutdown_waitq, _wait_for_empty_queues(device)); | |
4061 | } | |
4062 | EXPORT_SYMBOL_GPL(dasd_generic_shutdown); | |
4063 | ||
8e09f215 | 4064 | static int __init dasd_init(void) |
1da177e4 LT |
4065 | { |
4066 | int rc; | |
4067 | ||
4068 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 4069 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 4070 | init_waitqueue_head(&generic_waitq); |
4679e893 | 4071 | init_waitqueue_head(&shutdown_waitq); |
1da177e4 LT |
4072 | |
4073 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 4074 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
4075 | if (dasd_debug_area == NULL) { |
4076 | rc = -ENOMEM; | |
4077 | goto failed; | |
4078 | } | |
4079 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 4080 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
4081 | |
4082 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
4083 | ||
4084 | dasd_diag_discipline_pointer = NULL; | |
4085 | ||
4fa52aa7 SW |
4086 | dasd_statistics_createroot(); |
4087 | ||
1da177e4 LT |
4088 | rc = dasd_devmap_init(); |
4089 | if (rc) | |
4090 | goto failed; | |
4091 | rc = dasd_gendisk_init(); | |
4092 | if (rc) | |
4093 | goto failed; | |
4094 | rc = dasd_parse(); | |
4095 | if (rc) | |
4096 | goto failed; | |
20c64468 SW |
4097 | rc = dasd_eer_init(); |
4098 | if (rc) | |
4099 | goto failed; | |
1da177e4 LT |
4100 | #ifdef CONFIG_PROC_FS |
4101 | rc = dasd_proc_init(); | |
4102 | if (rc) | |
4103 | goto failed; | |
4104 | #endif | |
4105 | ||
4106 | return 0; | |
4107 | failed: | |
fc19f381 | 4108 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
4109 | dasd_exit(); |
4110 | return rc; | |
4111 | } | |
4112 | ||
4113 | module_init(dasd_init); | |
4114 | module_exit(dasd_exit); |