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Commit | Line | Data |
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6a55d2cd | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
d41dd122 | 8 | * Copyright IBM Corp. 1999, 2009 |
1da177e4 LT |
9 | */ |
10 | ||
fc19f381 SH |
11 | #define KMSG_COMPONENT "dasd" |
12 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
13 | ||
1da177e4 LT |
14 | #include <linux/kmod.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/major.h> | |
19 | #include <linux/slab.h> | |
a885c8c4 | 20 | #include <linux/hdreg.h> |
f3445a1a | 21 | #include <linux/async.h> |
9eb25122 | 22 | #include <linux/mutex.h> |
4fa52aa7 SW |
23 | #include <linux/debugfs.h> |
24 | #include <linux/seq_file.h> | |
e4258d55 | 25 | #include <linux/vmalloc.h> |
1da177e4 LT |
26 | |
27 | #include <asm/ccwdev.h> | |
28 | #include <asm/ebcdic.h> | |
29 | #include <asm/idals.h> | |
f3eb5384 | 30 | #include <asm/itcw.h> |
33b62a30 | 31 | #include <asm/diag.h> |
1da177e4 LT |
32 | |
33 | /* This is ugly... */ | |
34 | #define PRINTK_HEADER "dasd:" | |
35 | ||
36 | #include "dasd_int.h" | |
37 | /* | |
38 | * SECTION: Constant definitions to be used within this file | |
39 | */ | |
40 | #define DASD_CHANQ_MAX_SIZE 4 | |
41 | ||
7c53fcb3 PO |
42 | #define DASD_DIAG_MOD "dasd_diag_mod" |
43 | ||
1da177e4 LT |
44 | /* |
45 | * SECTION: exported variables of dasd.c | |
46 | */ | |
47 | debug_info_t *dasd_debug_area; | |
7048a2b5 | 48 | EXPORT_SYMBOL(dasd_debug_area); |
4fa52aa7 | 49 | static struct dentry *dasd_debugfs_root_entry; |
1da177e4 | 50 | struct dasd_discipline *dasd_diag_discipline_pointer; |
7048a2b5 | 51 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); |
2b67fc46 | 52 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
53 | |
54 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
55 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
a53c8fab | 56 | " Copyright IBM Corp. 2000"); |
1da177e4 | 57 | MODULE_SUPPORTED_DEVICE("dasd"); |
1da177e4 LT |
58 | MODULE_LICENSE("GPL"); |
59 | ||
60 | /* | |
61 | * SECTION: prototypes for static functions of dasd.c | |
62 | */ | |
8e09f215 SW |
63 | static int dasd_alloc_queue(struct dasd_block *); |
64 | static void dasd_setup_queue(struct dasd_block *); | |
65 | static void dasd_free_queue(struct dasd_block *); | |
8e09f215 SW |
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 *); |
e99e88a9 KC |
74 | static void dasd_device_timeout(struct timer_list *); |
75 | static void dasd_block_timeout(struct timer_list *); | |
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); | |
e99e88a9 | 123 | timer_setup(&device->timer, dasd_device_timeout, 0); |
4927b3f7 | 124 | INIT_WORK(&device->kick_work, do_kick_device); |
d41dd122 | 125 | INIT_WORK(&device->restore_device, do_restore_device); |
501183f2 | 126 | INIT_WORK(&device->reload_device, do_reload_device); |
a521b048 | 127 | INIT_WORK(&device->requeue_requests, do_requeue_requests); |
1da177e4 LT |
128 | device->state = DASD_STATE_NEW; |
129 | device->target = DASD_STATE_NEW; | |
9eb25122 | 130 | mutex_init(&device->state_mutex); |
4fa52aa7 | 131 | spin_lock_init(&device->profile.lock); |
1da177e4 LT |
132 | return device; |
133 | } | |
134 | ||
135 | /* | |
136 | * Free memory of a device structure. | |
137 | */ | |
8e09f215 | 138 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 139 | { |
17fd682e | 140 | kfree(device->private); |
1da177e4 LT |
141 | free_page((unsigned long) device->erp_mem); |
142 | free_pages((unsigned long) device->ccw_mem, 1); | |
143 | kfree(device); | |
144 | } | |
145 | ||
8e09f215 SW |
146 | /* |
147 | * Allocate memory for a new device structure. | |
148 | */ | |
149 | struct dasd_block *dasd_alloc_block(void) | |
150 | { | |
151 | struct dasd_block *block; | |
152 | ||
153 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
154 | if (!block) | |
155 | return ERR_PTR(-ENOMEM); | |
156 | /* open_count = 0 means device online but not in use */ | |
157 | atomic_set(&block->open_count, -1); | |
158 | ||
8e09f215 SW |
159 | atomic_set(&block->tasklet_scheduled, 0); |
160 | tasklet_init(&block->tasklet, | |
161 | (void (*)(unsigned long)) dasd_block_tasklet, | |
162 | (unsigned long) block); | |
163 | INIT_LIST_HEAD(&block->ccw_queue); | |
164 | spin_lock_init(&block->queue_lock); | |
e99e88a9 | 165 | timer_setup(&block->timer, dasd_block_timeout, 0); |
4fa52aa7 | 166 | spin_lock_init(&block->profile.lock); |
8e09f215 SW |
167 | |
168 | return block; | |
169 | } | |
7048a2b5 | 170 | EXPORT_SYMBOL_GPL(dasd_alloc_block); |
8e09f215 SW |
171 | |
172 | /* | |
173 | * Free memory of a device structure. | |
174 | */ | |
175 | void dasd_free_block(struct dasd_block *block) | |
176 | { | |
177 | kfree(block); | |
178 | } | |
7048a2b5 | 179 | EXPORT_SYMBOL_GPL(dasd_free_block); |
8e09f215 | 180 | |
1da177e4 LT |
181 | /* |
182 | * Make a new device known to the system. | |
183 | */ | |
8e09f215 | 184 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
185 | { |
186 | int rc; | |
187 | ||
188 | /* | |
138c014d | 189 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
190 | * keep the reference count > 0. |
191 | */ | |
192 | dasd_get_device(device); | |
193 | ||
8e09f215 SW |
194 | if (device->block) { |
195 | rc = dasd_alloc_queue(device->block); | |
196 | if (rc) { | |
197 | dasd_put_device(device); | |
198 | return rc; | |
199 | } | |
1da177e4 | 200 | } |
1da177e4 LT |
201 | device->state = DASD_STATE_KNOWN; |
202 | return 0; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Let the system forget about a device. | |
207 | */ | |
8e09f215 | 208 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 209 | { |
20c64468 SW |
210 | /* Disable extended error reporting for this device. */ |
211 | dasd_eer_disable(device); | |
1da177e4 LT |
212 | device->state = DASD_STATE_NEW; |
213 | ||
8e09f215 SW |
214 | if (device->block) |
215 | dasd_free_queue(device->block); | |
1da177e4 LT |
216 | |
217 | /* Give up reference we took in dasd_state_new_to_known. */ | |
218 | dasd_put_device(device); | |
8f61701b | 219 | return 0; |
1da177e4 LT |
220 | } |
221 | ||
4fa52aa7 SW |
222 | static struct dentry *dasd_debugfs_setup(const char *name, |
223 | struct dentry *base_dentry) | |
224 | { | |
225 | struct dentry *pde; | |
226 | ||
227 | if (!base_dentry) | |
228 | return NULL; | |
229 | pde = debugfs_create_dir(name, base_dentry); | |
230 | if (!pde || IS_ERR(pde)) | |
231 | return NULL; | |
232 | return pde; | |
233 | } | |
234 | ||
1da177e4 LT |
235 | /* |
236 | * Request the irq line for the device. | |
237 | */ | |
8e09f215 | 238 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 | 239 | { |
4fa52aa7 | 240 | struct dasd_block *block = device->block; |
d42e1712 | 241 | int rc = 0; |
1da177e4 LT |
242 | |
243 | /* Allocate and register gendisk structure. */ | |
4fa52aa7 SW |
244 | if (block) { |
245 | rc = dasd_gendisk_alloc(block); | |
8e09f215 SW |
246 | if (rc) |
247 | return rc; | |
4fa52aa7 SW |
248 | block->debugfs_dentry = |
249 | dasd_debugfs_setup(block->gdp->disk_name, | |
250 | dasd_debugfs_root_entry); | |
251 | dasd_profile_init(&block->profile, block->debugfs_dentry); | |
252 | if (dasd_global_profile_level == DASD_PROFILE_ON) | |
253 | dasd_profile_on(&device->block->profile); | |
254 | } | |
255 | device->debugfs_dentry = | |
256 | dasd_debugfs_setup(dev_name(&device->cdev->dev), | |
257 | dasd_debugfs_root_entry); | |
258 | dasd_profile_init(&device->profile, device->debugfs_dentry); | |
5a3b7b11 | 259 | dasd_hosts_init(device->debugfs_dentry, device); |
4fa52aa7 | 260 | |
1da177e4 | 261 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
fc19f381 | 262 | device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, |
8e09f215 | 263 | 8 * sizeof(long)); |
1da177e4 | 264 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 265 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
266 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
267 | ||
268 | device->state = DASD_STATE_BASIC; | |
d42e1712 SH |
269 | |
270 | return rc; | |
1da177e4 LT |
271 | } |
272 | ||
273 | /* | |
274 | * Release the irq line for the device. Terminate any running i/o. | |
275 | */ | |
8e09f215 | 276 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 277 | { |
8f61701b | 278 | int rc; |
d42e1712 | 279 | |
daa991bf SH |
280 | if (device->discipline->basic_to_known) { |
281 | rc = device->discipline->basic_to_known(device); | |
282 | if (rc) | |
283 | return rc; | |
284 | } | |
285 | ||
8e09f215 | 286 | if (device->block) { |
4fa52aa7 | 287 | dasd_profile_exit(&device->block->profile); |
d7309aaa | 288 | debugfs_remove(device->block->debugfs_dentry); |
8e09f215 SW |
289 | dasd_gendisk_free(device->block); |
290 | dasd_block_clear_timer(device->block); | |
291 | } | |
292 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
293 | if (rc) |
294 | return rc; | |
8e09f215 | 295 | dasd_device_clear_timer(device); |
4fa52aa7 | 296 | dasd_profile_exit(&device->profile); |
5a3b7b11 | 297 | dasd_hosts_exit(device); |
d7309aaa | 298 | debugfs_remove(device->debugfs_dentry); |
1da177e4 LT |
299 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
300 | if (device->debug_area != NULL) { | |
301 | debug_unregister(device->debug_area); | |
302 | device->debug_area = NULL; | |
303 | } | |
304 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 305 | return 0; |
1da177e4 LT |
306 | } |
307 | ||
308 | /* | |
309 | * Do the initial analysis. The do_analysis function may return | |
310 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
311 | * until the discipline decides to continue the startup sequence | |
312 | * by calling the function dasd_change_state. The eckd disciplines | |
313 | * uses this to start a ccw that detects the format. The completion | |
314 | * interrupt for this detection ccw uses the kernel event daemon to | |
315 | * trigger the call to dasd_change_state. All this is done in the | |
316 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
317 | * After the analysis ccw is done (do_analysis returned 0) the block |
318 | * device is setup. | |
319 | * In case the analysis returns an error, the device setup is stopped | |
320 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 321 | */ |
8e09f215 | 322 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
323 | { |
324 | int rc; | |
8e09f215 | 325 | struct dasd_block *block; |
eed5c4b1 | 326 | struct gendisk *disk; |
1da177e4 LT |
327 | |
328 | rc = 0; | |
8e09f215 | 329 | block = device->block; |
90f0094d | 330 | /* make disk known with correct capacity */ |
8e09f215 SW |
331 | if (block) { |
332 | if (block->base->discipline->do_analysis != NULL) | |
333 | rc = block->base->discipline->do_analysis(block); | |
334 | if (rc) { | |
d42e1712 | 335 | if (rc != -EAGAIN) { |
8e09f215 | 336 | device->state = DASD_STATE_UNFMT; |
eed5c4b1 SH |
337 | disk = device->block->gdp; |
338 | kobject_uevent(&disk_to_dev(disk)->kobj, | |
339 | KOBJ_CHANGE); | |
d42e1712 SH |
340 | goto out; |
341 | } | |
8e09f215 SW |
342 | return rc; |
343 | } | |
344 | dasd_setup_queue(block); | |
345 | set_capacity(block->gdp, | |
346 | block->blocks << block->s2b_shift); | |
347 | device->state = DASD_STATE_READY; | |
348 | rc = dasd_scan_partitions(block); | |
d42e1712 | 349 | if (rc) { |
8e09f215 | 350 | device->state = DASD_STATE_BASIC; |
d42e1712 SH |
351 | return rc; |
352 | } | |
8e09f215 SW |
353 | } else { |
354 | device->state = DASD_STATE_READY; | |
355 | } | |
d42e1712 SH |
356 | out: |
357 | if (device->discipline->basic_to_ready) | |
358 | rc = device->discipline->basic_to_ready(device); | |
90f0094d | 359 | return rc; |
1da177e4 LT |
360 | } |
361 | ||
d07dc5d8 SH |
362 | static inline |
363 | int _wait_for_empty_queues(struct dasd_device *device) | |
364 | { | |
365 | if (device->block) | |
366 | return list_empty(&device->ccw_queue) && | |
367 | list_empty(&device->block->ccw_queue); | |
368 | else | |
369 | return list_empty(&device->ccw_queue); | |
370 | } | |
371 | ||
1da177e4 LT |
372 | /* |
373 | * Remove device from block device layer. Destroy dirty buffers. | |
374 | * Forget format information. Check if the target level is basic | |
375 | * and if it is create fake disk for formatting. | |
376 | */ | |
8e09f215 | 377 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 378 | { |
8f61701b HH |
379 | int rc; |
380 | ||
1da177e4 | 381 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
382 | if (device->block) { |
383 | struct dasd_block *block = device->block; | |
384 | rc = dasd_flush_block_queue(block); | |
385 | if (rc) { | |
386 | device->state = DASD_STATE_READY; | |
387 | return rc; | |
388 | } | |
b695adfa | 389 | dasd_destroy_partitions(block); |
8e09f215 SW |
390 | block->blocks = 0; |
391 | block->bp_block = 0; | |
392 | block->s2b_shift = 0; | |
393 | } | |
8f61701b | 394 | return 0; |
1da177e4 LT |
395 | } |
396 | ||
90f0094d HH |
397 | /* |
398 | * Back to basic. | |
399 | */ | |
8e09f215 | 400 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
401 | { |
402 | device->state = DASD_STATE_BASIC; | |
8f61701b | 403 | return 0; |
90f0094d HH |
404 | } |
405 | ||
1da177e4 LT |
406 | /* |
407 | * Make the device online and schedule the bottom half to start | |
408 | * the requeueing of requests from the linux request queue to the | |
409 | * ccw queue. | |
410 | */ | |
8f61701b | 411 | static int |
1da177e4 LT |
412 | dasd_state_ready_to_online(struct dasd_device * device) |
413 | { | |
1301809b SW |
414 | struct gendisk *disk; |
415 | struct disk_part_iter piter; | |
416 | struct hd_struct *part; | |
8e09f215 | 417 | |
1da177e4 | 418 | device->state = DASD_STATE_ONLINE; |
1301809b | 419 | if (device->block) { |
8e09f215 | 420 | dasd_schedule_block_bh(device->block); |
e4dbb0f2 SH |
421 | if ((device->features & DASD_FEATURE_USERAW)) { |
422 | disk = device->block->gdp; | |
423 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); | |
424 | return 0; | |
425 | } | |
1301809b SW |
426 | disk = device->block->bdev->bd_disk; |
427 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
428 | while ((part = disk_part_iter_next(&piter))) | |
429 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
430 | disk_part_iter_exit(&piter); | |
431 | } | |
1da177e4 LT |
432 | return 0; |
433 | } | |
434 | ||
435 | /* | |
436 | * Stop the requeueing of requests again. | |
437 | */ | |
8e09f215 | 438 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 439 | { |
8e09f215 | 440 | int rc; |
1301809b SW |
441 | struct gendisk *disk; |
442 | struct disk_part_iter piter; | |
443 | struct hd_struct *part; | |
8e09f215 SW |
444 | |
445 | if (device->discipline->online_to_ready) { | |
446 | rc = device->discipline->online_to_ready(device); | |
447 | if (rc) | |
448 | return rc; | |
449 | } | |
d42e1712 | 450 | |
1da177e4 | 451 | device->state = DASD_STATE_READY; |
e4dbb0f2 | 452 | if (device->block && !(device->features & DASD_FEATURE_USERAW)) { |
1301809b SW |
453 | disk = device->block->bdev->bd_disk; |
454 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); | |
455 | while ((part = disk_part_iter_next(&piter))) | |
456 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); | |
457 | disk_part_iter_exit(&piter); | |
458 | } | |
8f61701b | 459 | return 0; |
1da177e4 LT |
460 | } |
461 | ||
462 | /* | |
463 | * Device startup state changes. | |
464 | */ | |
8e09f215 | 465 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
466 | { |
467 | int rc; | |
468 | ||
469 | rc = 0; | |
470 | if (device->state == DASD_STATE_NEW && | |
471 | device->target >= DASD_STATE_KNOWN) | |
472 | rc = dasd_state_new_to_known(device); | |
473 | ||
474 | if (!rc && | |
475 | device->state == DASD_STATE_KNOWN && | |
476 | device->target >= DASD_STATE_BASIC) | |
477 | rc = dasd_state_known_to_basic(device); | |
478 | ||
479 | if (!rc && | |
480 | device->state == DASD_STATE_BASIC && | |
481 | device->target >= DASD_STATE_READY) | |
482 | rc = dasd_state_basic_to_ready(device); | |
483 | ||
39ccf95e HH |
484 | if (!rc && |
485 | device->state == DASD_STATE_UNFMT && | |
486 | device->target > DASD_STATE_UNFMT) | |
487 | rc = -EPERM; | |
488 | ||
1da177e4 LT |
489 | if (!rc && |
490 | device->state == DASD_STATE_READY && | |
491 | device->target >= DASD_STATE_ONLINE) | |
492 | rc = dasd_state_ready_to_online(device); | |
493 | ||
494 | return rc; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Device shutdown state changes. | |
499 | */ | |
8e09f215 | 500 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 501 | { |
8f61701b HH |
502 | int rc; |
503 | ||
504 | rc = 0; | |
1da177e4 LT |
505 | if (device->state == DASD_STATE_ONLINE && |
506 | device->target <= DASD_STATE_READY) | |
8f61701b | 507 | rc = dasd_state_online_to_ready(device); |
138c014d | 508 | |
8f61701b HH |
509 | if (!rc && |
510 | device->state == DASD_STATE_READY && | |
1da177e4 | 511 | device->target <= DASD_STATE_BASIC) |
8f61701b | 512 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 513 | |
8f61701b HH |
514 | if (!rc && |
515 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 516 | device->target <= DASD_STATE_BASIC) |
8f61701b | 517 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 518 | |
8f61701b HH |
519 | if (!rc && |
520 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 521 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 522 | rc = dasd_state_basic_to_known(device); |
138c014d | 523 | |
8f61701b HH |
524 | if (!rc && |
525 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 526 | device->target <= DASD_STATE_NEW) |
8f61701b | 527 | rc = dasd_state_known_to_new(device); |
1da177e4 | 528 | |
8f61701b | 529 | return rc; |
1da177e4 LT |
530 | } |
531 | ||
532 | /* | |
533 | * This is the main startup/shutdown routine. | |
534 | */ | |
8e09f215 | 535 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 | 536 | { |
181d9522 | 537 | int rc; |
1da177e4 LT |
538 | |
539 | if (device->state == device->target) | |
540 | /* Already where we want to go today... */ | |
541 | return; | |
542 | if (device->state < device->target) | |
543 | rc = dasd_increase_state(device); | |
544 | else | |
545 | rc = dasd_decrease_state(device); | |
181d9522 SO |
546 | if (rc == -EAGAIN) |
547 | return; | |
548 | if (rc) | |
549 | device->target = device->state; | |
1da177e4 | 550 | |
4dfd5c45 HH |
551 | /* let user-space know that the device status changed */ |
552 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1f08be80 SO |
553 | |
554 | if (device->state == device->target) | |
555 | wake_up(&dasd_init_waitq); | |
1da177e4 LT |
556 | } |
557 | ||
558 | /* | |
559 | * Kick starter for devices that did not complete the startup/shutdown | |
560 | * procedure or were sleeping because of a pending state. | |
561 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
562 | * event daemon. | |
563 | */ | |
8e09f215 | 564 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 565 | { |
4927b3f7 | 566 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
9eb25122 | 567 | mutex_lock(&device->state_mutex); |
1da177e4 | 568 | dasd_change_state(device); |
9eb25122 | 569 | mutex_unlock(&device->state_mutex); |
8e09f215 | 570 | dasd_schedule_device_bh(device); |
1da177e4 LT |
571 | dasd_put_device(device); |
572 | } | |
573 | ||
8e09f215 | 574 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
575 | { |
576 | dasd_get_device(device); | |
577 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
f2608cd4 SH |
578 | if (!schedule_work(&device->kick_work)) |
579 | dasd_put_device(device); | |
1da177e4 | 580 | } |
7048a2b5 | 581 | EXPORT_SYMBOL(dasd_kick_device); |
1da177e4 | 582 | |
501183f2 SH |
583 | /* |
584 | * dasd_reload_device will schedule a call do do_reload_device to the kernel | |
585 | * event daemon. | |
586 | */ | |
587 | static void do_reload_device(struct work_struct *work) | |
588 | { | |
589 | struct dasd_device *device = container_of(work, struct dasd_device, | |
590 | reload_device); | |
591 | device->discipline->reload(device); | |
592 | dasd_put_device(device); | |
593 | } | |
594 | ||
595 | void dasd_reload_device(struct dasd_device *device) | |
596 | { | |
597 | dasd_get_device(device); | |
598 | /* queue call to dasd_reload_device to the kernel event daemon. */ | |
f2608cd4 SH |
599 | if (!schedule_work(&device->reload_device)) |
600 | dasd_put_device(device); | |
501183f2 SH |
601 | } |
602 | EXPORT_SYMBOL(dasd_reload_device); | |
603 | ||
d41dd122 SH |
604 | /* |
605 | * dasd_restore_device will schedule a call do do_restore_device to the kernel | |
606 | * event daemon. | |
607 | */ | |
608 | static void do_restore_device(struct work_struct *work) | |
609 | { | |
610 | struct dasd_device *device = container_of(work, struct dasd_device, | |
611 | restore_device); | |
612 | device->cdev->drv->restore(device->cdev); | |
613 | dasd_put_device(device); | |
614 | } | |
615 | ||
616 | void dasd_restore_device(struct dasd_device *device) | |
617 | { | |
618 | dasd_get_device(device); | |
619 | /* queue call to dasd_restore_device to the kernel event daemon. */ | |
f2608cd4 SH |
620 | if (!schedule_work(&device->restore_device)) |
621 | dasd_put_device(device); | |
d41dd122 SH |
622 | } |
623 | ||
1da177e4 LT |
624 | /* |
625 | * Set the target state for a device and starts the state change. | |
626 | */ | |
8e09f215 | 627 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 | 628 | { |
f3445a1a | 629 | dasd_get_device(device); |
9eb25122 | 630 | mutex_lock(&device->state_mutex); |
1da177e4 LT |
631 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ |
632 | if (dasd_probeonly && target > DASD_STATE_READY) | |
633 | target = DASD_STATE_READY; | |
634 | if (device->target != target) { | |
9eb25122 | 635 | if (device->state == target) |
1da177e4 LT |
636 | wake_up(&dasd_init_waitq); |
637 | device->target = target; | |
638 | } | |
639 | if (device->state != device->target) | |
640 | dasd_change_state(device); | |
9eb25122 SH |
641 | mutex_unlock(&device->state_mutex); |
642 | dasd_put_device(device); | |
1da177e4 | 643 | } |
7048a2b5 | 644 | EXPORT_SYMBOL(dasd_set_target_state); |
1da177e4 LT |
645 | |
646 | /* | |
647 | * Enable devices with device numbers in [from..to]. | |
648 | */ | |
8e09f215 | 649 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
650 | { |
651 | return (device->state == device->target); | |
652 | } | |
653 | ||
8e09f215 | 654 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
655 | { |
656 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
657 | if (device->state <= DASD_STATE_KNOWN) | |
658 | /* No discipline for device found. */ | |
659 | dasd_set_target_state(device, DASD_STATE_NEW); | |
660 | /* Now wait for the devices to come up. */ | |
661 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
25e2cf1c SH |
662 | |
663 | dasd_reload_device(device); | |
664 | if (device->discipline->kick_validate) | |
665 | device->discipline->kick_validate(device); | |
1da177e4 | 666 | } |
7048a2b5 | 667 | EXPORT_SYMBOL(dasd_enable_device); |
1da177e4 LT |
668 | |
669 | /* | |
670 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
671 | */ | |
1da177e4 | 672 | |
4fa52aa7 | 673 | unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; |
1da177e4 | 674 | |
4fa52aa7 | 675 | #ifdef CONFIG_DASD_PROFILE |
8ea55c95 | 676 | struct dasd_profile dasd_global_profile = { |
8ea55c95 SO |
677 | .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock), |
678 | }; | |
4fa52aa7 | 679 | static struct dentry *dasd_debugfs_global_entry; |
1da177e4 LT |
680 | |
681 | /* | |
682 | * Add profiling information for cqr before execution. | |
683 | */ | |
8e09f215 SW |
684 | static void dasd_profile_start(struct dasd_block *block, |
685 | struct dasd_ccw_req *cqr, | |
686 | struct request *req) | |
1da177e4 LT |
687 | { |
688 | struct list_head *l; | |
689 | unsigned int counter; | |
4fa52aa7 | 690 | struct dasd_device *device; |
1da177e4 LT |
691 | |
692 | /* count the length of the chanq for statistics */ | |
693 | counter = 0; | |
4fa52aa7 SW |
694 | if (dasd_global_profile_level || block->profile.data) |
695 | list_for_each(l, &block->ccw_queue) | |
696 | if (++counter >= 31) | |
697 | break; | |
698 | ||
8ea55c95 | 699 | spin_lock(&dasd_global_profile.lock); |
6765cc2a | 700 | if (dasd_global_profile.data) { |
8ea55c95 | 701 | dasd_global_profile.data->dasd_io_nr_req[counter]++; |
4fa52aa7 | 702 | if (rq_data_dir(req) == READ) |
8ea55c95 | 703 | dasd_global_profile.data->dasd_read_nr_req[counter]++; |
4fa52aa7 | 704 | } |
8ea55c95 | 705 | spin_unlock(&dasd_global_profile.lock); |
4fa52aa7 SW |
706 | |
707 | spin_lock(&block->profile.lock); | |
c81a90c8 | 708 | if (block->profile.data) { |
4fa52aa7 SW |
709 | block->profile.data->dasd_io_nr_req[counter]++; |
710 | if (rq_data_dir(req) == READ) | |
711 | block->profile.data->dasd_read_nr_req[counter]++; | |
c81a90c8 | 712 | } |
4fa52aa7 SW |
713 | spin_unlock(&block->profile.lock); |
714 | ||
715 | /* | |
716 | * We count the request for the start device, even though it may run on | |
717 | * some other device due to error recovery. This way we make sure that | |
718 | * we count each request only once. | |
719 | */ | |
720 | device = cqr->startdev; | |
721 | if (device->profile.data) { | |
722 | counter = 1; /* request is not yet queued on the start device */ | |
723 | list_for_each(l, &device->ccw_queue) | |
724 | if (++counter >= 31) | |
725 | break; | |
726 | } | |
727 | spin_lock(&device->profile.lock); | |
728 | if (device->profile.data) { | |
729 | device->profile.data->dasd_io_nr_req[counter]++; | |
730 | if (rq_data_dir(req) == READ) | |
731 | device->profile.data->dasd_read_nr_req[counter]++; | |
732 | } | |
733 | spin_unlock(&device->profile.lock); | |
1da177e4 LT |
734 | } |
735 | ||
736 | /* | |
737 | * Add profiling information for cqr after execution. | |
738 | */ | |
4fa52aa7 SW |
739 | |
740 | #define dasd_profile_counter(value, index) \ | |
741 | { \ | |
742 | for (index = 0; index < 31 && value >> (2+index); index++) \ | |
743 | ; \ | |
744 | } | |
745 | ||
746 | static void dasd_profile_end_add_data(struct dasd_profile_info *data, | |
747 | int is_alias, | |
748 | int is_tpm, | |
749 | int is_read, | |
750 | long sectors, | |
751 | int sectors_ind, | |
752 | int tottime_ind, | |
753 | int tottimeps_ind, | |
754 | int strtime_ind, | |
755 | int irqtime_ind, | |
756 | int irqtimeps_ind, | |
757 | int endtime_ind) | |
758 | { | |
759 | /* in case of an overflow, reset the whole profile */ | |
760 | if (data->dasd_io_reqs == UINT_MAX) { | |
761 | memset(data, 0, sizeof(*data)); | |
bd7a9b37 | 762 | ktime_get_real_ts64(&data->starttod); |
4fa52aa7 SW |
763 | } |
764 | data->dasd_io_reqs++; | |
765 | data->dasd_io_sects += sectors; | |
766 | if (is_alias) | |
767 | data->dasd_io_alias++; | |
768 | if (is_tpm) | |
769 | data->dasd_io_tpm++; | |
770 | ||
771 | data->dasd_io_secs[sectors_ind]++; | |
772 | data->dasd_io_times[tottime_ind]++; | |
773 | data->dasd_io_timps[tottimeps_ind]++; | |
774 | data->dasd_io_time1[strtime_ind]++; | |
775 | data->dasd_io_time2[irqtime_ind]++; | |
776 | data->dasd_io_time2ps[irqtimeps_ind]++; | |
777 | data->dasd_io_time3[endtime_ind]++; | |
778 | ||
779 | if (is_read) { | |
780 | data->dasd_read_reqs++; | |
781 | data->dasd_read_sects += sectors; | |
782 | if (is_alias) | |
783 | data->dasd_read_alias++; | |
784 | if (is_tpm) | |
785 | data->dasd_read_tpm++; | |
786 | data->dasd_read_secs[sectors_ind]++; | |
787 | data->dasd_read_times[tottime_ind]++; | |
788 | data->dasd_read_time1[strtime_ind]++; | |
789 | data->dasd_read_time2[irqtime_ind]++; | |
790 | data->dasd_read_time3[endtime_ind]++; | |
791 | } | |
792 | } | |
793 | ||
8e09f215 SW |
794 | static void dasd_profile_end(struct dasd_block *block, |
795 | struct dasd_ccw_req *cqr, | |
796 | struct request *req) | |
1da177e4 | 797 | { |
d2907225 SH |
798 | unsigned long strtime, irqtime, endtime, tottime; |
799 | unsigned long tottimeps, sectors; | |
4fa52aa7 SW |
800 | struct dasd_device *device; |
801 | int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; | |
802 | int irqtime_ind, irqtimeps_ind, endtime_ind; | |
d2907225 | 803 | struct dasd_profile_info *data; |
1da177e4 | 804 | |
4fa52aa7 SW |
805 | device = cqr->startdev; |
806 | if (!(dasd_global_profile_level || | |
807 | block->profile.data || | |
808 | device->profile.data)) | |
1da177e4 LT |
809 | return; |
810 | ||
83096ebf | 811 | sectors = blk_rq_sectors(req); |
1da177e4 LT |
812 | if (!cqr->buildclk || !cqr->startclk || |
813 | !cqr->stopclk || !cqr->endclk || | |
814 | !sectors) | |
815 | return; | |
816 | ||
817 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
818 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
819 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
820 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
821 | tottimeps = tottime / sectors; | |
822 | ||
4fa52aa7 SW |
823 | dasd_profile_counter(sectors, sectors_ind); |
824 | dasd_profile_counter(tottime, tottime_ind); | |
825 | dasd_profile_counter(tottimeps, tottimeps_ind); | |
826 | dasd_profile_counter(strtime, strtime_ind); | |
827 | dasd_profile_counter(irqtime, irqtime_ind); | |
828 | dasd_profile_counter(irqtime / sectors, irqtimeps_ind); | |
829 | dasd_profile_counter(endtime, endtime_ind); | |
830 | ||
8ea55c95 | 831 | spin_lock(&dasd_global_profile.lock); |
6765cc2a | 832 | if (dasd_global_profile.data) { |
d2907225 SH |
833 | data = dasd_global_profile.data; |
834 | data->dasd_sum_times += tottime; | |
835 | data->dasd_sum_time_str += strtime; | |
836 | data->dasd_sum_time_irq += irqtime; | |
837 | data->dasd_sum_time_end += endtime; | |
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); | |
d2907225 SH |
850 | if (block->profile.data) { |
851 | data = block->profile.data; | |
852 | data->dasd_sum_times += tottime; | |
853 | data->dasd_sum_time_str += strtime; | |
854 | data->dasd_sum_time_irq += irqtime; | |
855 | data->dasd_sum_time_end += endtime; | |
4fa52aa7 SW |
856 | dasd_profile_end_add_data(block->profile.data, |
857 | cqr->startdev != block->base, | |
858 | cqr->cpmode == 1, | |
859 | rq_data_dir(req) == READ, | |
860 | sectors, sectors_ind, tottime_ind, | |
861 | tottimeps_ind, strtime_ind, | |
862 | irqtime_ind, irqtimeps_ind, | |
863 | endtime_ind); | |
d2907225 | 864 | } |
4fa52aa7 SW |
865 | spin_unlock(&block->profile.lock); |
866 | ||
867 | spin_lock(&device->profile.lock); | |
d2907225 SH |
868 | if (device->profile.data) { |
869 | data = device->profile.data; | |
870 | data->dasd_sum_times += tottime; | |
871 | data->dasd_sum_time_str += strtime; | |
872 | data->dasd_sum_time_irq += irqtime; | |
873 | data->dasd_sum_time_end += endtime; | |
4fa52aa7 SW |
874 | dasd_profile_end_add_data(device->profile.data, |
875 | cqr->startdev != block->base, | |
876 | cqr->cpmode == 1, | |
877 | rq_data_dir(req) == READ, | |
878 | sectors, sectors_ind, tottime_ind, | |
879 | tottimeps_ind, strtime_ind, | |
880 | irqtime_ind, irqtimeps_ind, | |
881 | endtime_ind); | |
d2907225 | 882 | } |
4fa52aa7 SW |
883 | spin_unlock(&device->profile.lock); |
884 | } | |
885 | ||
886 | void dasd_profile_reset(struct dasd_profile *profile) | |
887 | { | |
888 | struct dasd_profile_info *data; | |
889 | ||
890 | spin_lock_bh(&profile->lock); | |
891 | data = profile->data; | |
892 | if (!data) { | |
893 | spin_unlock_bh(&profile->lock); | |
894 | return; | |
895 | } | |
896 | memset(data, 0, sizeof(*data)); | |
bd7a9b37 | 897 | ktime_get_real_ts64(&data->starttod); |
4fa52aa7 SW |
898 | spin_unlock_bh(&profile->lock); |
899 | } | |
900 | ||
4fa52aa7 SW |
901 | int dasd_profile_on(struct dasd_profile *profile) |
902 | { | |
903 | struct dasd_profile_info *data; | |
904 | ||
905 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
906 | if (!data) | |
907 | return -ENOMEM; | |
908 | spin_lock_bh(&profile->lock); | |
909 | if (profile->data) { | |
910 | spin_unlock_bh(&profile->lock); | |
911 | kfree(data); | |
912 | return 0; | |
913 | } | |
bd7a9b37 | 914 | ktime_get_real_ts64(&data->starttod); |
4fa52aa7 SW |
915 | profile->data = data; |
916 | spin_unlock_bh(&profile->lock); | |
917 | return 0; | |
918 | } | |
919 | ||
920 | void dasd_profile_off(struct dasd_profile *profile) | |
921 | { | |
922 | spin_lock_bh(&profile->lock); | |
923 | kfree(profile->data); | |
924 | profile->data = NULL; | |
925 | spin_unlock_bh(&profile->lock); | |
926 | } | |
927 | ||
928 | char *dasd_get_user_string(const char __user *user_buf, size_t user_len) | |
929 | { | |
930 | char *buffer; | |
931 | ||
e4258d55 | 932 | buffer = vmalloc(user_len + 1); |
4fa52aa7 SW |
933 | if (buffer == NULL) |
934 | return ERR_PTR(-ENOMEM); | |
935 | if (copy_from_user(buffer, user_buf, user_len) != 0) { | |
e4258d55 | 936 | vfree(buffer); |
4fa52aa7 SW |
937 | return ERR_PTR(-EFAULT); |
938 | } | |
939 | /* got the string, now strip linefeed. */ | |
940 | if (buffer[user_len - 1] == '\n') | |
941 | buffer[user_len - 1] = 0; | |
942 | else | |
943 | buffer[user_len] = 0; | |
944 | return buffer; | |
1da177e4 | 945 | } |
4fa52aa7 SW |
946 | |
947 | static ssize_t dasd_stats_write(struct file *file, | |
948 | const char __user *user_buf, | |
949 | size_t user_len, loff_t *pos) | |
950 | { | |
951 | char *buffer, *str; | |
952 | int rc; | |
953 | struct seq_file *m = (struct seq_file *)file->private_data; | |
954 | struct dasd_profile *prof = m->private; | |
955 | ||
956 | if (user_len > 65536) | |
957 | user_len = 65536; | |
958 | buffer = dasd_get_user_string(user_buf, user_len); | |
959 | if (IS_ERR(buffer)) | |
960 | return PTR_ERR(buffer); | |
961 | ||
962 | str = skip_spaces(buffer); | |
963 | rc = user_len; | |
964 | if (strncmp(str, "reset", 5) == 0) { | |
965 | dasd_profile_reset(prof); | |
966 | } else if (strncmp(str, "on", 2) == 0) { | |
967 | rc = dasd_profile_on(prof); | |
6765cc2a SO |
968 | if (rc) |
969 | goto out; | |
970 | rc = user_len; | |
971 | if (prof == &dasd_global_profile) { | |
972 | dasd_profile_reset(prof); | |
973 | dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; | |
974 | } | |
4fa52aa7 | 975 | } else if (strncmp(str, "off", 3) == 0) { |
6765cc2a SO |
976 | if (prof == &dasd_global_profile) |
977 | dasd_global_profile_level = DASD_PROFILE_OFF; | |
4fa52aa7 SW |
978 | dasd_profile_off(prof); |
979 | } else | |
980 | rc = -EINVAL; | |
6765cc2a | 981 | out: |
e4258d55 | 982 | vfree(buffer); |
4fa52aa7 SW |
983 | return rc; |
984 | } | |
985 | ||
986 | static void dasd_stats_array(struct seq_file *m, unsigned int *array) | |
987 | { | |
988 | int i; | |
989 | ||
990 | for (i = 0; i < 32; i++) | |
991 | seq_printf(m, "%u ", array[i]); | |
992 | seq_putc(m, '\n'); | |
993 | } | |
994 | ||
995 | static void dasd_stats_seq_print(struct seq_file *m, | |
996 | struct dasd_profile_info *data) | |
997 | { | |
bd7a9b37 AB |
998 | seq_printf(m, "start_time %lld.%09ld\n", |
999 | (s64)data->starttod.tv_sec, data->starttod.tv_nsec); | |
4fa52aa7 SW |
1000 | seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); |
1001 | seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); | |
1002 | seq_printf(m, "total_pav %u\n", data->dasd_io_alias); | |
1003 | seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); | |
d2907225 SH |
1004 | seq_printf(m, "avg_total %lu\n", data->dasd_io_reqs ? |
1005 | data->dasd_sum_times / data->dasd_io_reqs : 0UL); | |
1006 | seq_printf(m, "avg_build_to_ssch %lu\n", data->dasd_io_reqs ? | |
1007 | data->dasd_sum_time_str / data->dasd_io_reqs : 0UL); | |
1008 | seq_printf(m, "avg_ssch_to_irq %lu\n", data->dasd_io_reqs ? | |
1009 | data->dasd_sum_time_irq / data->dasd_io_reqs : 0UL); | |
1010 | seq_printf(m, "avg_irq_to_end %lu\n", data->dasd_io_reqs ? | |
1011 | data->dasd_sum_time_end / data->dasd_io_reqs : 0UL); | |
c794caf9 | 1012 | seq_puts(m, "histogram_sectors "); |
4fa52aa7 | 1013 | dasd_stats_array(m, data->dasd_io_secs); |
c794caf9 | 1014 | seq_puts(m, "histogram_io_times "); |
4fa52aa7 | 1015 | dasd_stats_array(m, data->dasd_io_times); |
c794caf9 | 1016 | seq_puts(m, "histogram_io_times_weighted "); |
4fa52aa7 | 1017 | dasd_stats_array(m, data->dasd_io_timps); |
c794caf9 | 1018 | seq_puts(m, "histogram_time_build_to_ssch "); |
4fa52aa7 | 1019 | dasd_stats_array(m, data->dasd_io_time1); |
c794caf9 | 1020 | seq_puts(m, "histogram_time_ssch_to_irq "); |
4fa52aa7 | 1021 | dasd_stats_array(m, data->dasd_io_time2); |
c794caf9 | 1022 | seq_puts(m, "histogram_time_ssch_to_irq_weighted "); |
4fa52aa7 | 1023 | dasd_stats_array(m, data->dasd_io_time2ps); |
c794caf9 | 1024 | seq_puts(m, "histogram_time_irq_to_end "); |
4fa52aa7 | 1025 | dasd_stats_array(m, data->dasd_io_time3); |
c794caf9 | 1026 | seq_puts(m, "histogram_ccw_queue_length "); |
4fa52aa7 SW |
1027 | dasd_stats_array(m, data->dasd_io_nr_req); |
1028 | seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); | |
1029 | seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); | |
1030 | seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); | |
1031 | seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); | |
c794caf9 | 1032 | seq_puts(m, "histogram_read_sectors "); |
4fa52aa7 | 1033 | dasd_stats_array(m, data->dasd_read_secs); |
c794caf9 | 1034 | seq_puts(m, "histogram_read_times "); |
4fa52aa7 | 1035 | dasd_stats_array(m, data->dasd_read_times); |
c794caf9 | 1036 | seq_puts(m, "histogram_read_time_build_to_ssch "); |
4fa52aa7 | 1037 | dasd_stats_array(m, data->dasd_read_time1); |
c794caf9 | 1038 | seq_puts(m, "histogram_read_time_ssch_to_irq "); |
4fa52aa7 | 1039 | dasd_stats_array(m, data->dasd_read_time2); |
c794caf9 | 1040 | seq_puts(m, "histogram_read_time_irq_to_end "); |
4fa52aa7 | 1041 | dasd_stats_array(m, data->dasd_read_time3); |
c794caf9 | 1042 | seq_puts(m, "histogram_read_ccw_queue_length "); |
4fa52aa7 SW |
1043 | dasd_stats_array(m, data->dasd_read_nr_req); |
1044 | } | |
1045 | ||
1046 | static int dasd_stats_show(struct seq_file *m, void *v) | |
1047 | { | |
1048 | struct dasd_profile *profile; | |
1049 | struct dasd_profile_info *data; | |
1050 | ||
1051 | profile = m->private; | |
1052 | spin_lock_bh(&profile->lock); | |
1053 | data = profile->data; | |
1054 | if (!data) { | |
1055 | spin_unlock_bh(&profile->lock); | |
c794caf9 | 1056 | seq_puts(m, "disabled\n"); |
4fa52aa7 SW |
1057 | return 0; |
1058 | } | |
1059 | dasd_stats_seq_print(m, data); | |
1060 | spin_unlock_bh(&profile->lock); | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static int dasd_stats_open(struct inode *inode, struct file *file) | |
1065 | { | |
1066 | struct dasd_profile *profile = inode->i_private; | |
1067 | return single_open(file, dasd_stats_show, profile); | |
1068 | } | |
1069 | ||
1070 | static const struct file_operations dasd_stats_raw_fops = { | |
1071 | .owner = THIS_MODULE, | |
1072 | .open = dasd_stats_open, | |
1073 | .read = seq_read, | |
1074 | .llseek = seq_lseek, | |
1075 | .release = single_release, | |
1076 | .write = dasd_stats_write, | |
1077 | }; | |
1078 | ||
4fa52aa7 SW |
1079 | static void dasd_profile_init(struct dasd_profile *profile, |
1080 | struct dentry *base_dentry) | |
1081 | { | |
f4ae40a6 | 1082 | umode_t mode; |
4fa52aa7 SW |
1083 | struct dentry *pde; |
1084 | ||
1085 | if (!base_dentry) | |
1086 | return; | |
1087 | profile->dentry = NULL; | |
1088 | profile->data = NULL; | |
1089 | mode = (S_IRUSR | S_IWUSR | S_IFREG); | |
1090 | pde = debugfs_create_file("statistics", mode, base_dentry, | |
1091 | profile, &dasd_stats_raw_fops); | |
1092 | if (pde && !IS_ERR(pde)) | |
1093 | profile->dentry = pde; | |
1094 | return; | |
1095 | } | |
1096 | ||
1097 | static void dasd_profile_exit(struct dasd_profile *profile) | |
1098 | { | |
1099 | dasd_profile_off(profile); | |
d7309aaa FF |
1100 | debugfs_remove(profile->dentry); |
1101 | profile->dentry = NULL; | |
4fa52aa7 SW |
1102 | } |
1103 | ||
1104 | static void dasd_statistics_removeroot(void) | |
1105 | { | |
1106 | dasd_global_profile_level = DASD_PROFILE_OFF; | |
6765cc2a | 1107 | dasd_profile_exit(&dasd_global_profile); |
d7309aaa FF |
1108 | debugfs_remove(dasd_debugfs_global_entry); |
1109 | debugfs_remove(dasd_debugfs_root_entry); | |
4fa52aa7 SW |
1110 | } |
1111 | ||
1112 | static void dasd_statistics_createroot(void) | |
1113 | { | |
4fa52aa7 SW |
1114 | struct dentry *pde; |
1115 | ||
1116 | dasd_debugfs_root_entry = NULL; | |
4fa52aa7 SW |
1117 | pde = debugfs_create_dir("dasd", NULL); |
1118 | if (!pde || IS_ERR(pde)) | |
1119 | goto error; | |
1120 | dasd_debugfs_root_entry = pde; | |
1121 | pde = debugfs_create_dir("global", dasd_debugfs_root_entry); | |
1122 | if (!pde || IS_ERR(pde)) | |
1123 | goto error; | |
1124 | dasd_debugfs_global_entry = pde; | |
6765cc2a | 1125 | dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry); |
4fa52aa7 SW |
1126 | return; |
1127 | ||
1128 | error: | |
1129 | DBF_EVENT(DBF_ERR, "%s", | |
1130 | "Creation of the dasd debugfs interface failed"); | |
1131 | dasd_statistics_removeroot(); | |
1132 | return; | |
1133 | } | |
1134 | ||
1da177e4 | 1135 | #else |
8e09f215 SW |
1136 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
1137 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
4fa52aa7 SW |
1138 | |
1139 | static void dasd_statistics_createroot(void) | |
1140 | { | |
1141 | return; | |
1142 | } | |
1143 | ||
1144 | static void dasd_statistics_removeroot(void) | |
1145 | { | |
1146 | return; | |
1147 | } | |
1148 | ||
1149 | int dasd_stats_generic_show(struct seq_file *m, void *v) | |
1150 | { | |
c794caf9 | 1151 | seq_puts(m, "Statistics are not activated in this kernel\n"); |
4fa52aa7 SW |
1152 | return 0; |
1153 | } | |
1154 | ||
1155 | static void dasd_profile_init(struct dasd_profile *profile, | |
1156 | struct dentry *base_dentry) | |
1157 | { | |
1158 | return; | |
1159 | } | |
1160 | ||
1161 | static void dasd_profile_exit(struct dasd_profile *profile) | |
1162 | { | |
1163 | return; | |
1164 | } | |
1165 | ||
1166 | int dasd_profile_on(struct dasd_profile *profile) | |
1167 | { | |
1168 | return 0; | |
1169 | } | |
1170 | ||
1da177e4 LT |
1171 | #endif /* CONFIG_DASD_PROFILE */ |
1172 | ||
5a3b7b11 SH |
1173 | static int dasd_hosts_show(struct seq_file *m, void *v) |
1174 | { | |
1175 | struct dasd_device *device; | |
1176 | int rc = -EOPNOTSUPP; | |
1177 | ||
1178 | device = m->private; | |
1179 | dasd_get_device(device); | |
1180 | ||
1181 | if (device->discipline->hosts_print) | |
1182 | rc = device->discipline->hosts_print(device, m); | |
1183 | ||
1184 | dasd_put_device(device); | |
1185 | return rc; | |
1186 | } | |
1187 | ||
1188 | static int dasd_hosts_open(struct inode *inode, struct file *file) | |
1189 | { | |
1190 | struct dasd_device *device = inode->i_private; | |
1191 | ||
1192 | return single_open(file, dasd_hosts_show, device); | |
1193 | } | |
1194 | ||
1195 | static const struct file_operations dasd_hosts_fops = { | |
1196 | .owner = THIS_MODULE, | |
1197 | .open = dasd_hosts_open, | |
1198 | .read = seq_read, | |
1199 | .llseek = seq_lseek, | |
1200 | .release = single_release, | |
1201 | }; | |
1202 | ||
1203 | static void dasd_hosts_exit(struct dasd_device *device) | |
1204 | { | |
1205 | debugfs_remove(device->hosts_dentry); | |
1206 | device->hosts_dentry = NULL; | |
1207 | } | |
1208 | ||
1209 | static void dasd_hosts_init(struct dentry *base_dentry, | |
1210 | struct dasd_device *device) | |
1211 | { | |
1212 | struct dentry *pde; | |
1213 | umode_t mode; | |
1214 | ||
1215 | if (!base_dentry) | |
1216 | return; | |
1217 | ||
1218 | mode = S_IRUSR | S_IFREG; | |
1219 | pde = debugfs_create_file("host_access_list", mode, base_dentry, | |
1220 | device, &dasd_hosts_fops); | |
1221 | if (pde && !IS_ERR(pde)) | |
1222 | device->hosts_dentry = pde; | |
1223 | } | |
1224 | ||
1da177e4 LT |
1225 | /* |
1226 | * Allocate memory for a channel program with 'cplength' channel | |
1227 | * command words and 'datasize' additional space. There are two | |
1228 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
1229 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
1230 | * that gets allocated for each device. | |
1231 | */ | |
68b781fe | 1232 | struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, |
8e09f215 SW |
1233 | int datasize, |
1234 | struct dasd_device *device) | |
1da177e4 LT |
1235 | { |
1236 | struct dasd_ccw_req *cqr; | |
1237 | ||
1238 | /* Sanity checks */ | |
68b781fe | 1239 | BUG_ON(datasize > PAGE_SIZE || |
7ac1e877 | 1240 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); |
1da177e4 | 1241 | |
88abaab4 | 1242 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
1243 | if (cqr == NULL) |
1244 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1245 | cqr->cpaddr = NULL; |
1246 | if (cplength > 0) { | |
88abaab4 | 1247 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
1248 | GFP_ATOMIC | GFP_DMA); |
1249 | if (cqr->cpaddr == NULL) { | |
1250 | kfree(cqr); | |
1251 | return ERR_PTR(-ENOMEM); | |
1252 | } | |
1da177e4 LT |
1253 | } |
1254 | cqr->data = NULL; | |
1255 | if (datasize > 0) { | |
88abaab4 | 1256 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 1257 | if (cqr->data == NULL) { |
17fd682e | 1258 | kfree(cqr->cpaddr); |
1da177e4 LT |
1259 | kfree(cqr); |
1260 | return ERR_PTR(-ENOMEM); | |
1261 | } | |
1da177e4 | 1262 | } |
68b781fe | 1263 | cqr->magic = magic; |
1da177e4 LT |
1264 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
1265 | dasd_get_device(device); | |
1266 | return cqr; | |
1267 | } | |
7048a2b5 | 1268 | EXPORT_SYMBOL(dasd_kmalloc_request); |
1da177e4 | 1269 | |
68b781fe | 1270 | struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, |
8e09f215 SW |
1271 | int datasize, |
1272 | struct dasd_device *device) | |
1da177e4 LT |
1273 | { |
1274 | unsigned long flags; | |
1275 | struct dasd_ccw_req *cqr; | |
1276 | char *data; | |
1277 | int size; | |
1278 | ||
1da177e4 LT |
1279 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; |
1280 | if (cplength > 0) | |
1281 | size += cplength * sizeof(struct ccw1); | |
1282 | if (datasize > 0) | |
1283 | size += datasize; | |
1284 | spin_lock_irqsave(&device->mem_lock, flags); | |
1285 | cqr = (struct dasd_ccw_req *) | |
1286 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
1287 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
1288 | if (cqr == NULL) | |
1289 | return ERR_PTR(-ENOMEM); | |
1290 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
1291 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
1292 | cqr->cpaddr = NULL; | |
1293 | if (cplength > 0) { | |
1294 | cqr->cpaddr = (struct ccw1 *) data; | |
1295 | data += cplength*sizeof(struct ccw1); | |
1296 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
1297 | } | |
1298 | cqr->data = NULL; | |
1299 | if (datasize > 0) { | |
1300 | cqr->data = data; | |
1301 | memset(cqr->data, 0, datasize); | |
1302 | } | |
68b781fe | 1303 | cqr->magic = magic; |
1da177e4 LT |
1304 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); |
1305 | dasd_get_device(device); | |
1306 | return cqr; | |
1307 | } | |
7048a2b5 | 1308 | EXPORT_SYMBOL(dasd_smalloc_request); |
1da177e4 LT |
1309 | |
1310 | /* | |
1311 | * Free memory of a channel program. This function needs to free all the | |
1312 | * idal lists that might have been created by dasd_set_cda and the | |
1313 | * struct dasd_ccw_req itself. | |
1314 | */ | |
8e09f215 | 1315 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 1316 | { |
1da177e4 LT |
1317 | struct ccw1 *ccw; |
1318 | ||
1319 | /* Clear any idals used for the request. */ | |
1320 | ccw = cqr->cpaddr; | |
1321 | do { | |
1322 | clear_normalized_cda(ccw); | |
1323 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
17fd682e JJ |
1324 | kfree(cqr->cpaddr); |
1325 | kfree(cqr->data); | |
1da177e4 LT |
1326 | kfree(cqr); |
1327 | dasd_put_device(device); | |
1328 | } | |
7048a2b5 | 1329 | EXPORT_SYMBOL(dasd_kfree_request); |
1da177e4 | 1330 | |
8e09f215 | 1331 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
1332 | { |
1333 | unsigned long flags; | |
1334 | ||
1335 | spin_lock_irqsave(&device->mem_lock, flags); | |
1336 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
1337 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
1338 | dasd_put_device(device); | |
1339 | } | |
7048a2b5 | 1340 | EXPORT_SYMBOL(dasd_sfree_request); |
1da177e4 LT |
1341 | |
1342 | /* | |
1343 | * Check discipline magic in cqr. | |
1344 | */ | |
8e09f215 | 1345 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1346 | { |
1347 | struct dasd_device *device; | |
1348 | ||
1349 | if (cqr == NULL) | |
1350 | return -EINVAL; | |
8e09f215 | 1351 | device = cqr->startdev; |
1da177e4 | 1352 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
fc19f381 | 1353 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
1354 | " dasd_ccw_req 0x%08x magic doesn't match" |
1355 | " discipline 0x%08x", | |
1356 | cqr->magic, | |
1357 | *(unsigned int *) device->discipline->name); | |
1358 | return -EINVAL; | |
1359 | } | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | /* | |
1364 | * Terminate the current i/o and set the request to clear_pending. | |
1365 | * Timer keeps device runnig. | |
1366 | * ccw_device_clear can fail if the i/o subsystem | |
1367 | * is in a bad mood. | |
1368 | */ | |
8e09f215 | 1369 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1370 | { |
1371 | struct dasd_device *device; | |
1372 | int retries, rc; | |
fc19f381 | 1373 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
1374 | |
1375 | /* Check the cqr */ | |
1376 | rc = dasd_check_cqr(cqr); | |
1377 | if (rc) | |
1378 | return rc; | |
1379 | retries = 0; | |
8e09f215 | 1380 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
1381 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
1382 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
1383 | switch (rc) { | |
1384 | case 0: /* termination successful */ | |
8e09f215 | 1385 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1aae0560 | 1386 | cqr->stopclk = get_tod_clock(); |
8f61701b | 1387 | cqr->starttime = 0; |
1da177e4 LT |
1388 | DBF_DEV_EVENT(DBF_DEBUG, device, |
1389 | "terminate cqr %p successful", | |
1390 | cqr); | |
1391 | break; | |
1392 | case -ENODEV: | |
1393 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1394 | "device gone, retry"); | |
1395 | break; | |
1396 | case -EIO: | |
1397 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1398 | "I/O error, retry"); | |
1399 | break; | |
1400 | case -EINVAL: | |
2c17124b SH |
1401 | /* |
1402 | * device not valid so no I/O could be running | |
1403 | * handle CQR as termination successful | |
1404 | */ | |
1405 | cqr->status = DASD_CQR_CLEARED; | |
1406 | cqr->stopclk = get_tod_clock(); | |
1407 | cqr->starttime = 0; | |
1408 | /* no retries for invalid devices */ | |
1409 | cqr->retries = -1; | |
1410 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1411 | "EINVAL, handle as terminated"); | |
1412 | /* fake rc to success */ | |
1413 | rc = 0; | |
1414 | break; | |
1da177e4 LT |
1415 | case -EBUSY: |
1416 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
1417 | "device busy, retry later"); | |
1418 | break; | |
1419 | default: | |
fc19f381 SH |
1420 | /* internal error 10 - unknown rc*/ |
1421 | snprintf(errorstring, ERRORLENGTH, "10 %d", rc); | |
1422 | dev_err(&device->cdev->dev, "An error occurred in the " | |
1423 | "DASD device driver, reason=%s\n", errorstring); | |
1da177e4 LT |
1424 | BUG(); |
1425 | break; | |
1426 | } | |
1427 | retries++; | |
1428 | } | |
8e09f215 | 1429 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1430 | return rc; |
1431 | } | |
7048a2b5 | 1432 | EXPORT_SYMBOL(dasd_term_IO); |
1da177e4 LT |
1433 | |
1434 | /* | |
1435 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
1436 | * In that case set up a timer to start the request later. | |
1437 | */ | |
8e09f215 | 1438 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1439 | { |
1440 | struct dasd_device *device; | |
1441 | int rc; | |
fc19f381 | 1442 | char errorstring[ERRORLENGTH]; |
1da177e4 LT |
1443 | |
1444 | /* Check the cqr */ | |
1445 | rc = dasd_check_cqr(cqr); | |
6cc7f168 SW |
1446 | if (rc) { |
1447 | cqr->intrc = rc; | |
1da177e4 | 1448 | return rc; |
6cc7f168 | 1449 | } |
8e09f215 | 1450 | device = (struct dasd_device *) cqr->startdev; |
5a27e60d SW |
1451 | if (((cqr->block && |
1452 | test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || | |
1453 | test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && | |
1454 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
1455 | DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " | |
1456 | "because of stolen lock", cqr); | |
1457 | cqr->status = DASD_CQR_ERROR; | |
1458 | cqr->intrc = -EPERM; | |
1459 | return -EPERM; | |
1460 | } | |
1da177e4 | 1461 | if (cqr->retries < 0) { |
fc19f381 SH |
1462 | /* internal error 14 - start_IO run out of retries */ |
1463 | sprintf(errorstring, "14 %p", cqr); | |
1464 | dev_err(&device->cdev->dev, "An error occurred in the DASD " | |
1465 | "device driver, reason=%s\n", errorstring); | |
8e09f215 | 1466 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
1467 | return -EIO; |
1468 | } | |
1aae0560 | 1469 | cqr->startclk = get_tod_clock(); |
1da177e4 LT |
1470 | cqr->starttime = jiffies; |
1471 | cqr->retries--; | |
a4d26c6a | 1472 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
c9346151 | 1473 | cqr->lpm &= dasd_path_get_opm(device); |
a4d26c6a | 1474 | if (!cqr->lpm) |
c9346151 | 1475 | cqr->lpm = dasd_path_get_opm(device); |
a4d26c6a | 1476 | } |
f3eb5384 SW |
1477 | if (cqr->cpmode == 1) { |
1478 | rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, | |
1479 | (long) cqr, cqr->lpm); | |
1480 | } else { | |
1481 | rc = ccw_device_start(device->cdev, cqr->cpaddr, | |
1482 | (long) cqr, cqr->lpm, 0); | |
1483 | } | |
1da177e4 LT |
1484 | switch (rc) { |
1485 | case 0: | |
1486 | cqr->status = DASD_CQR_IN_IO; | |
1da177e4 LT |
1487 | break; |
1488 | case -EBUSY: | |
a4d26c6a | 1489 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
1490 | "start_IO: device busy, retry later"); |
1491 | break; | |
1492 | case -ETIMEDOUT: | |
a4d26c6a | 1493 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
1494 | "start_IO: request timeout, retry later"); |
1495 | break; | |
1496 | case -EACCES: | |
a4d26c6a SW |
1497 | /* -EACCES indicates that the request used only a subset of the |
1498 | * available paths and all these paths are gone. If the lpm of | |
1499 | * this request was only a subset of the opm (e.g. the ppm) then | |
1500 | * we just do a retry with all available paths. | |
1501 | * If we already use the full opm, something is amiss, and we | |
1502 | * need a full path verification. | |
1da177e4 | 1503 | */ |
a4d26c6a SW |
1504 | if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { |
1505 | DBF_DEV_EVENT(DBF_WARNING, device, | |
1506 | "start_IO: selected paths gone (%x)", | |
1507 | cqr->lpm); | |
c9346151 SH |
1508 | } else if (cqr->lpm != dasd_path_get_opm(device)) { |
1509 | cqr->lpm = dasd_path_get_opm(device); | |
a4d26c6a SW |
1510 | DBF_DEV_EVENT(DBF_DEBUG, device, "%s", |
1511 | "start_IO: selected paths gone," | |
1512 | " retry on all paths"); | |
1513 | } else { | |
1514 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", | |
1515 | "start_IO: all paths in opm gone," | |
1516 | " do path verification"); | |
1517 | dasd_generic_last_path_gone(device); | |
c9346151 SH |
1518 | dasd_path_no_path(device); |
1519 | dasd_path_set_tbvpm(device, | |
1520 | ccw_device_get_path_mask( | |
1521 | device->cdev)); | |
a4d26c6a | 1522 | } |
1da177e4 LT |
1523 | break; |
1524 | case -ENODEV: | |
a4d26c6a | 1525 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
f3eb5384 SW |
1526 | "start_IO: -ENODEV device gone, retry"); |
1527 | break; | |
1da177e4 | 1528 | case -EIO: |
a4d26c6a | 1529 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
f3eb5384 | 1530 | "start_IO: -EIO device gone, retry"); |
1da177e4 | 1531 | break; |
d41dd122 SH |
1532 | case -EINVAL: |
1533 | /* most likely caused in power management context */ | |
a4d26c6a | 1534 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
d41dd122 SH |
1535 | "start_IO: -EINVAL device currently " |
1536 | "not accessible"); | |
1537 | break; | |
1da177e4 | 1538 | default: |
fc19f381 SH |
1539 | /* internal error 11 - unknown rc */ |
1540 | snprintf(errorstring, ERRORLENGTH, "11 %d", rc); | |
1541 | dev_err(&device->cdev->dev, | |
1542 | "An error occurred in the DASD device driver, " | |
1543 | "reason=%s\n", errorstring); | |
1da177e4 LT |
1544 | BUG(); |
1545 | break; | |
1546 | } | |
6cc7f168 | 1547 | cqr->intrc = rc; |
1da177e4 LT |
1548 | return rc; |
1549 | } | |
7048a2b5 | 1550 | EXPORT_SYMBOL(dasd_start_IO); |
1da177e4 LT |
1551 | |
1552 | /* | |
1553 | * Timeout function for dasd devices. This is used for different purposes | |
1554 | * 1) missing interrupt handler for normal operation | |
1555 | * 2) delayed start of request where start_IO failed with -EBUSY | |
1556 | * 3) timeout for missing state change interrupts | |
1557 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
1558 | * DASD_CQR_QUEUED for 2) and 3). | |
1559 | */ | |
e99e88a9 | 1560 | static void dasd_device_timeout(struct timer_list *t) |
1da177e4 LT |
1561 | { |
1562 | unsigned long flags; | |
1563 | struct dasd_device *device; | |
1564 | ||
e99e88a9 | 1565 | device = from_timer(device, t, timer); |
1da177e4 LT |
1566 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
1567 | /* re-activate request queue */ | |
eb6e199b | 1568 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
1da177e4 | 1569 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
8e09f215 | 1570 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1571 | } |
1572 | ||
1573 | /* | |
1574 | * Setup timeout for a device in jiffies. | |
1575 | */ | |
8e09f215 | 1576 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 | 1577 | { |
48cae885 SW |
1578 | if (expires == 0) |
1579 | del_timer(&device->timer); | |
1580 | else | |
1581 | mod_timer(&device->timer, jiffies + expires); | |
1da177e4 | 1582 | } |
7048a2b5 | 1583 | EXPORT_SYMBOL(dasd_device_set_timer); |
1da177e4 LT |
1584 | |
1585 | /* | |
1586 | * Clear timeout for a device. | |
1587 | */ | |
8e09f215 | 1588 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 | 1589 | { |
48cae885 | 1590 | del_timer(&device->timer); |
1da177e4 | 1591 | } |
7048a2b5 | 1592 | EXPORT_SYMBOL(dasd_device_clear_timer); |
1da177e4 | 1593 | |
8e09f215 SW |
1594 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
1595 | unsigned long intparm) | |
1da177e4 LT |
1596 | { |
1597 | struct dasd_ccw_req *cqr; | |
1598 | struct dasd_device *device; | |
1599 | ||
f16f5843 SW |
1600 | if (!intparm) |
1601 | return; | |
1da177e4 LT |
1602 | cqr = (struct dasd_ccw_req *) intparm; |
1603 | if (cqr->status != DASD_CQR_IN_IO) { | |
b8ed5dd5 SH |
1604 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, |
1605 | "invalid status in handle_killed_request: " | |
1606 | "%02x", cqr->status); | |
1da177e4 LT |
1607 | return; |
1608 | } | |
1609 | ||
589c74d5 SH |
1610 | device = dasd_device_from_cdev_locked(cdev); |
1611 | if (IS_ERR(device)) { | |
1612 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", | |
1613 | "unable to get device from cdev"); | |
1614 | return; | |
1615 | } | |
1616 | ||
1617 | if (!cqr->startdev || | |
1618 | device != cqr->startdev || | |
1619 | strncmp(cqr->startdev->discipline->ebcname, | |
1620 | (char *) &cqr->magic, 4)) { | |
294001a8 SH |
1621 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1622 | "invalid device in request"); | |
589c74d5 | 1623 | dasd_put_device(device); |
1da177e4 LT |
1624 | return; |
1625 | } | |
1626 | ||
1627 | /* Schedule request to be retried. */ | |
1628 | cqr->status = DASD_CQR_QUEUED; | |
1629 | ||
8e09f215 SW |
1630 | dasd_device_clear_timer(device); |
1631 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1632 | dasd_put_device(device); |
1633 | } | |
1634 | ||
8e09f215 | 1635 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 1636 | { |
20c64468 SW |
1637 | /* First of all start sense subsystem status request. */ |
1638 | dasd_eer_snss(device); | |
1639 | ||
eb6e199b | 1640 | dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); |
8e09f215 | 1641 | dasd_schedule_device_bh(device); |
e443343e | 1642 | if (device->block) { |
8e09f215 | 1643 | dasd_schedule_block_bh(device->block); |
673514af SH |
1644 | if (device->block->request_queue) |
1645 | blk_mq_run_hw_queues(device->block->request_queue, | |
1646 | true); | |
e443343e | 1647 | } |
1da177e4 | 1648 | } |
7048a2b5 | 1649 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
1da177e4 | 1650 | |
a521b048 SH |
1651 | static int dasd_check_hpf_error(struct irb *irb) |
1652 | { | |
1653 | return (scsw_tm_is_valid_schxs(&irb->scsw) && | |
1654 | (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX || | |
1655 | irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX)); | |
1656 | } | |
1657 | ||
1da177e4 LT |
1658 | /* |
1659 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
1660 | */ | |
8e09f215 SW |
1661 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
1662 | struct irb *irb) | |
1da177e4 LT |
1663 | { |
1664 | struct dasd_ccw_req *cqr, *next; | |
1665 | struct dasd_device *device; | |
7bf76f01 | 1666 | unsigned long now; |
8fd57520 JH |
1667 | int nrf_suppressed = 0; |
1668 | int fp_suppressed = 0; | |
1669 | u8 *sense = NULL; | |
1da177e4 | 1670 | int expires; |
1da177e4 | 1671 | |
9ba333dc | 1672 | cqr = (struct dasd_ccw_req *) intparm; |
1da177e4 LT |
1673 | if (IS_ERR(irb)) { |
1674 | switch (PTR_ERR(irb)) { | |
1675 | case -EIO: | |
9ba333dc | 1676 | if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) { |
c9346151 | 1677 | device = cqr->startdev; |
9ba333dc SH |
1678 | cqr->status = DASD_CQR_CLEARED; |
1679 | dasd_device_clear_timer(device); | |
1680 | wake_up(&dasd_flush_wq); | |
1681 | dasd_schedule_device_bh(device); | |
1682 | return; | |
1683 | } | |
1da177e4 LT |
1684 | break; |
1685 | case -ETIMEDOUT: | |
b8ed5dd5 SH |
1686 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1687 | "request timed out\n", __func__); | |
1da177e4 LT |
1688 | break; |
1689 | default: | |
b8ed5dd5 SH |
1690 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " |
1691 | "unknown error %ld\n", __func__, | |
1692 | PTR_ERR(irb)); | |
1da177e4 | 1693 | } |
f16f5843 | 1694 | dasd_handle_killed_request(cdev, intparm); |
1da177e4 LT |
1695 | return; |
1696 | } | |
1697 | ||
1aae0560 | 1698 | now = get_tod_clock(); |
5a27e60d SW |
1699 | /* check for conditions that should be handled immediately */ |
1700 | if (!cqr || | |
1701 | !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && | |
1702 | scsw_cstat(&irb->scsw) == 0)) { | |
a5a0061f SW |
1703 | if (cqr) |
1704 | memcpy(&cqr->irb, irb, sizeof(*irb)); | |
a00bfd71 | 1705 | device = dasd_device_from_cdev_locked(cdev); |
56b86b61 SH |
1706 | if (IS_ERR(device)) |
1707 | return; | |
1708 | /* ignore unsolicited interrupts for DIAG discipline */ | |
1709 | if (device->discipline == dasd_diag_discipline_pointer) { | |
1da177e4 | 1710 | dasd_put_device(device); |
56b86b61 | 1711 | return; |
1da177e4 | 1712 | } |
8fd57520 JH |
1713 | |
1714 | /* | |
1715 | * In some cases 'File Protected' or 'No Record Found' errors | |
1716 | * might be expected and debug log messages for the | |
1717 | * corresponding interrupts shouldn't be written then. | |
1718 | * Check if either of the according suppress bits is set. | |
1719 | */ | |
1720 | sense = dasd_get_sense(irb); | |
1721 | if (sense) { | |
1722 | fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) && | |
1723 | test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags); | |
1724 | nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) && | |
1725 | test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags); | |
1726 | } | |
1727 | if (!(fp_suppressed || nrf_suppressed)) | |
1728 | device->discipline->dump_sense_dbf(device, irb, "int"); | |
1729 | ||
5a27e60d SW |
1730 | if (device->features & DASD_FEATURE_ERPLOG) |
1731 | device->discipline->dump_sense(device, cqr, irb); | |
1732 | device->discipline->check_for_device_change(device, cqr, irb); | |
56b86b61 | 1733 | dasd_put_device(device); |
1da177e4 | 1734 | } |
5db8440c SH |
1735 | |
1736 | /* check for for attention message */ | |
1737 | if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) { | |
1738 | device = dasd_device_from_cdev_locked(cdev); | |
2202134e SH |
1739 | if (!IS_ERR(device)) { |
1740 | device->discipline->check_attention(device, | |
1741 | irb->esw.esw1.lpum); | |
1742 | dasd_put_device(device); | |
1743 | } | |
5db8440c SH |
1744 | } |
1745 | ||
5a27e60d SW |
1746 | if (!cqr) |
1747 | return; | |
1da177e4 | 1748 | |
8e09f215 SW |
1749 | device = (struct dasd_device *) cqr->startdev; |
1750 | if (!device || | |
1da177e4 | 1751 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
294001a8 SH |
1752 | DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", |
1753 | "invalid device in request"); | |
1da177e4 LT |
1754 | return; |
1755 | } | |
1756 | ||
1757 | /* Check for clear pending */ | |
8e09f215 | 1758 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
f3eb5384 | 1759 | scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1760 | cqr->status = DASD_CQR_CLEARED; |
1761 | dasd_device_clear_timer(device); | |
8f61701b | 1762 | wake_up(&dasd_flush_wq); |
8e09f215 | 1763 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1764 | return; |
1765 | } | |
1766 | ||
f3eb5384 | 1767 | /* check status - the request might have been killed by dyn detach */ |
1da177e4 | 1768 | if (cqr->status != DASD_CQR_IN_IO) { |
fc19f381 SH |
1769 | DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " |
1770 | "status %02x", dev_name(&cdev->dev), cqr->status); | |
1da177e4 LT |
1771 | return; |
1772 | } | |
fc19f381 | 1773 | |
8e09f215 | 1774 | next = NULL; |
1da177e4 | 1775 | expires = 0; |
f3eb5384 SW |
1776 | if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1777 | scsw_cstat(&irb->scsw) == 0) { | |
8e09f215 SW |
1778 | /* request was completed successfully */ |
1779 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1780 | cqr->stopclk = now; |
1781 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1782 | if (cqr->devlist.next != &device->ccw_queue) { |
1783 | next = list_entry(cqr->devlist.next, | |
1784 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1785 | } |
8e09f215 | 1786 | } else { /* error */ |
a521b048 SH |
1787 | /* check for HPF error |
1788 | * call discipline function to requeue all requests | |
1789 | * and disable HPF accordingly | |
1790 | */ | |
1791 | if (cqr->cpmode && dasd_check_hpf_error(irb) && | |
1792 | device->discipline->handle_hpf_error) | |
1793 | device->discipline->handle_hpf_error(device, irb); | |
6c5f57c7 SH |
1794 | /* |
1795 | * If we don't want complex ERP for this request, then just | |
1796 | * reset this and retry it in the fastpath | |
8e09f215 | 1797 | */ |
6c5f57c7 | 1798 | if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && |
8e09f215 | 1799 | cqr->retries > 0) { |
c9346151 | 1800 | if (cqr->lpm == dasd_path_get_opm(device)) |
fc19f381 SH |
1801 | DBF_DEV_EVENT(DBF_DEBUG, device, |
1802 | "default ERP in fastpath " | |
1803 | "(%i retries left)", | |
1804 | cqr->retries); | |
a4d26c6a | 1805 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) |
c9346151 | 1806 | cqr->lpm = dasd_path_get_opm(device); |
8e09f215 SW |
1807 | cqr->status = DASD_CQR_QUEUED; |
1808 | next = cqr; | |
1809 | } else | |
1da177e4 | 1810 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1811 | } |
1812 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1813 | (!device->stopped)) { | |
1814 | if (device->discipline->start_IO(next) == 0) | |
1815 | expires = next->expires; | |
1da177e4 LT |
1816 | } |
1817 | if (expires != 0) | |
8e09f215 | 1818 | dasd_device_set_timer(device, expires); |
1da177e4 | 1819 | else |
8e09f215 SW |
1820 | dasd_device_clear_timer(device); |
1821 | dasd_schedule_device_bh(device); | |
1da177e4 | 1822 | } |
7048a2b5 | 1823 | EXPORT_SYMBOL(dasd_int_handler); |
1da177e4 | 1824 | |
a23ed009 SH |
1825 | enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) |
1826 | { | |
1827 | struct dasd_device *device; | |
1828 | ||
1829 | device = dasd_device_from_cdev_locked(cdev); | |
1830 | ||
1831 | if (IS_ERR(device)) | |
1832 | goto out; | |
1833 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || | |
1834 | device->state != device->target || | |
5a27e60d | 1835 | !device->discipline->check_for_device_change){ |
a23ed009 SH |
1836 | dasd_put_device(device); |
1837 | goto out; | |
1838 | } | |
5a27e60d SW |
1839 | if (device->discipline->dump_sense_dbf) |
1840 | device->discipline->dump_sense_dbf(device, irb, "uc"); | |
1841 | device->discipline->check_for_device_change(device, NULL, irb); | |
a23ed009 SH |
1842 | dasd_put_device(device); |
1843 | out: | |
1844 | return UC_TODO_RETRY; | |
1845 | } | |
1846 | EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); | |
1847 | ||
1da177e4 | 1848 | /* |
8e09f215 SW |
1849 | * If we have an error on a dasd_block layer request then we cancel |
1850 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1851 | */ |
8e09f215 SW |
1852 | static void __dasd_device_recovery(struct dasd_device *device, |
1853 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1854 | { |
8e09f215 SW |
1855 | struct list_head *l, *n; |
1856 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1857 | |
8e09f215 SW |
1858 | /* |
1859 | * only requeue request that came from the dasd_block layer | |
1860 | */ | |
1861 | if (!ref_cqr->block) | |
1862 | return; | |
1da177e4 | 1863 | |
8e09f215 SW |
1864 | list_for_each_safe(l, n, &device->ccw_queue) { |
1865 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1866 | if (cqr->status == DASD_CQR_QUEUED && | |
1867 | ref_cqr->block == cqr->block) { | |
1868 | cqr->status = DASD_CQR_CLEARED; | |
1869 | } | |
1870 | } | |
1871 | }; | |
1da177e4 LT |
1872 | |
1873 | /* | |
8e09f215 SW |
1874 | * Remove those ccw requests from the queue that need to be returned |
1875 | * to the upper layer. | |
1da177e4 | 1876 | */ |
8e09f215 SW |
1877 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1878 | struct list_head *final_queue) | |
1da177e4 LT |
1879 | { |
1880 | struct list_head *l, *n; | |
1881 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1882 | |
1da177e4 LT |
1883 | /* Process request with final status. */ |
1884 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1885 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1886 | ||
1fbdb8be | 1887 | /* Skip any non-final request. */ |
8e09f215 SW |
1888 | if (cqr->status == DASD_CQR_QUEUED || |
1889 | cqr->status == DASD_CQR_IN_IO || | |
1890 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1fbdb8be | 1891 | continue; |
1da177e4 | 1892 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1893 | __dasd_device_recovery(device, cqr); |
20c64468 | 1894 | } |
1da177e4 | 1895 | /* Rechain finished requests to final queue */ |
8e09f215 | 1896 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1897 | } |
1898 | } | |
1899 | ||
1da177e4 | 1900 | /* |
8e09f215 SW |
1901 | * the cqrs from the final queue are returned to the upper layer |
1902 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1903 | */ |
8e09f215 SW |
1904 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1905 | struct list_head *final_queue) | |
1da177e4 | 1906 | { |
8e09f215 | 1907 | struct list_head *l, *n; |
1da177e4 | 1908 | struct dasd_ccw_req *cqr; |
03513bcc | 1909 | struct dasd_block *block; |
c80ee724 SH |
1910 | void (*callback)(struct dasd_ccw_req *, void *data); |
1911 | void *callback_data; | |
fc19f381 | 1912 | char errorstring[ERRORLENGTH]; |
f24acd45 | 1913 | |
8e09f215 SW |
1914 | list_for_each_safe(l, n, final_queue) { |
1915 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1916 | list_del_init(&cqr->devlist); | |
03513bcc | 1917 | block = cqr->block; |
c80ee724 SH |
1918 | callback = cqr->callback; |
1919 | callback_data = cqr->callback_data; | |
03513bcc SW |
1920 | if (block) |
1921 | spin_lock_bh(&block->queue_lock); | |
8e09f215 SW |
1922 | switch (cqr->status) { |
1923 | case DASD_CQR_SUCCESS: | |
1924 | cqr->status = DASD_CQR_DONE; | |
1925 | break; | |
1926 | case DASD_CQR_ERROR: | |
1927 | cqr->status = DASD_CQR_NEED_ERP; | |
1928 | break; | |
1929 | case DASD_CQR_CLEARED: | |
1930 | cqr->status = DASD_CQR_TERMINATED; | |
1931 | break; | |
1932 | default: | |
fc19f381 SH |
1933 | /* internal error 12 - wrong cqr status*/ |
1934 | snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); | |
1935 | dev_err(&device->cdev->dev, | |
1936 | "An error occurred in the DASD device driver, " | |
1937 | "reason=%s\n", errorstring); | |
8e09f215 | 1938 | BUG(); |
1da177e4 | 1939 | } |
8e09f215 | 1940 | if (cqr->callback != NULL) |
c80ee724 | 1941 | (callback)(cqr, callback_data); |
03513bcc SW |
1942 | if (block) |
1943 | spin_unlock_bh(&block->queue_lock); | |
1da177e4 LT |
1944 | } |
1945 | } | |
1946 | ||
1947 | /* | |
1948 | * Take a look at the first request on the ccw queue and check | |
1949 | * if it reached its expire time. If so, terminate the IO. | |
1950 | */ | |
8e09f215 | 1951 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1952 | { |
1953 | struct dasd_ccw_req *cqr; | |
1954 | ||
1955 | if (list_empty(&device->ccw_queue)) | |
1956 | return; | |
8e09f215 | 1957 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1958 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1959 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
d07dc5d8 SH |
1960 | if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { |
1961 | /* | |
1962 | * IO in safe offline processing should not | |
1963 | * run out of retries | |
1964 | */ | |
1965 | cqr->retries++; | |
1966 | } | |
29145a6c HH |
1967 | if (device->discipline->term_IO(cqr) != 0) { |
1968 | /* Hmpf, try again in 5 sec */ | |
fc19f381 | 1969 | dev_err(&device->cdev->dev, |
625c94df | 1970 | "cqr %p timed out (%lus) but cannot be " |
fc19f381 SH |
1971 | "ended, retrying in 5 s\n", |
1972 | cqr, (cqr->expires/HZ)); | |
7dc1da9f SH |
1973 | cqr->expires += 5*HZ; |
1974 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1975 | } else { |
fc19f381 | 1976 | dev_err(&device->cdev->dev, |
625c94df | 1977 | "cqr %p timed out (%lus), %i retries " |
fc19f381 SH |
1978 | "remaining\n", cqr, (cqr->expires/HZ), |
1979 | cqr->retries); | |
1da177e4 LT |
1980 | } |
1981 | } | |
1982 | } | |
1983 | ||
f81a49d1 SH |
1984 | /* |
1985 | * return 1 when device is not eligible for IO | |
1986 | */ | |
1987 | static int __dasd_device_is_unusable(struct dasd_device *device, | |
1988 | struct dasd_ccw_req *cqr) | |
1989 | { | |
1990 | int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM); | |
1991 | ||
e8ac0155 SH |
1992 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags) && |
1993 | !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
1994 | /* | |
1995 | * dasd is being set offline | |
1996 | * but it is no safe offline where we have to allow I/O | |
1997 | */ | |
f81a49d1 SH |
1998 | return 1; |
1999 | } | |
2000 | if (device->stopped) { | |
2001 | if (device->stopped & mask) { | |
2002 | /* stopped and CQR will not change that. */ | |
2003 | return 1; | |
2004 | } | |
2005 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { | |
2006 | /* CQR is not able to change device to | |
2007 | * operational. */ | |
2008 | return 1; | |
2009 | } | |
2010 | /* CQR required to get device operational. */ | |
2011 | } | |
2012 | return 0; | |
2013 | } | |
2014 | ||
1da177e4 LT |
2015 | /* |
2016 | * Take a look at the first request on the ccw queue and check | |
2017 | * if it needs to be started. | |
2018 | */ | |
8e09f215 | 2019 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
2020 | { |
2021 | struct dasd_ccw_req *cqr; | |
2022 | int rc; | |
2023 | ||
2024 | if (list_empty(&device->ccw_queue)) | |
2025 | return; | |
8e09f215 | 2026 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
2027 | if (cqr->status != DASD_CQR_QUEUED) |
2028 | return; | |
f81a49d1 SH |
2029 | /* if device is not usable return request to upper layer */ |
2030 | if (__dasd_device_is_unusable(device, cqr)) { | |
a4d26c6a | 2031 | cqr->intrc = -EAGAIN; |
8e09f215 SW |
2032 | cqr->status = DASD_CQR_CLEARED; |
2033 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 2034 | return; |
1c01b8a5 | 2035 | } |
25ee4cf8 PO |
2036 | |
2037 | rc = device->discipline->start_IO(cqr); | |
2038 | if (rc == 0) | |
8e09f215 | 2039 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 2040 | else if (rc == -EACCES) { |
8e09f215 | 2041 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
2042 | } else |
2043 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 2044 | dasd_device_set_timer(device, 50); |
8f61701b HH |
2045 | } |
2046 | ||
a4d26c6a SW |
2047 | static void __dasd_device_check_path_events(struct dasd_device *device) |
2048 | { | |
2049 | int rc; | |
2050 | ||
c9346151 SH |
2051 | if (!dasd_path_get_tbvpm(device)) |
2052 | return; | |
2053 | ||
2054 | if (device->stopped & | |
2055 | ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) | |
2056 | return; | |
2057 | rc = device->discipline->verify_path(device, | |
2058 | dasd_path_get_tbvpm(device)); | |
2059 | if (rc) | |
2060 | dasd_device_set_timer(device, 50); | |
2061 | else | |
2062 | dasd_path_clear_all_verify(device); | |
a4d26c6a SW |
2063 | }; |
2064 | ||
1da177e4 | 2065 | /* |
8e09f215 SW |
2066 | * Go through all request on the dasd_device request queue, |
2067 | * terminate them on the cdev if necessary, and return them to the | |
2068 | * submitting layer via callback. | |
2069 | * Note: | |
2070 | * Make sure that all 'submitting layers' still exist when | |
2071 | * this function is called!. In other words, when 'device' is a base | |
2072 | * device then all block layer requests must have been removed before | |
2073 | * via dasd_flush_block_queue. | |
1da177e4 | 2074 | */ |
8e09f215 | 2075 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 2076 | { |
8e09f215 SW |
2077 | struct dasd_ccw_req *cqr, *n; |
2078 | int rc; | |
1da177e4 | 2079 | struct list_head flush_queue; |
1da177e4 LT |
2080 | |
2081 | INIT_LIST_HEAD(&flush_queue); | |
2082 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 2083 | rc = 0; |
8e09f215 | 2084 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
2085 | /* Check status and move request to flush_queue */ |
2086 | switch (cqr->status) { | |
2087 | case DASD_CQR_IN_IO: | |
2088 | rc = device->discipline->term_IO(cqr); | |
2089 | if (rc) { | |
2090 | /* unable to terminate requeust */ | |
fc19f381 SH |
2091 | dev_err(&device->cdev->dev, |
2092 | "Flushing the DASD request queue " | |
2093 | "failed for request %p\n", cqr); | |
8f61701b HH |
2094 | /* stop flush processing */ |
2095 | goto finished; | |
2096 | } | |
2097 | break; | |
2098 | case DASD_CQR_QUEUED: | |
1aae0560 | 2099 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 2100 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 2101 | break; |
8e09f215 | 2102 | default: /* no need to modify the others */ |
8f61701b HH |
2103 | break; |
2104 | } | |
8e09f215 | 2105 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 2106 | } |
8f61701b HH |
2107 | finished: |
2108 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
2109 | /* |
2110 | * After this point all requests must be in state CLEAR_PENDING, | |
2111 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
2112 | * one of the others. | |
2113 | */ | |
2114 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
2115 | wait_event(dasd_flush_wq, | |
2116 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
2117 | /* | |
2118 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
2119 | * and call the callback function of flushed requests | |
2120 | */ | |
2121 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 2122 | return rc; |
1da177e4 | 2123 | } |
7048a2b5 | 2124 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); |
1da177e4 LT |
2125 | |
2126 | /* | |
2127 | * Acquire the device lock and process queues for the device. | |
2128 | */ | |
8e09f215 | 2129 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
2130 | { |
2131 | struct list_head final_queue; | |
1da177e4 LT |
2132 | |
2133 | atomic_set (&device->tasklet_scheduled, 0); | |
2134 | INIT_LIST_HEAD(&final_queue); | |
2135 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
2136 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
2137 | __dasd_device_check_expire(device); |
2138 | /* find final requests on ccw queue */ | |
2139 | __dasd_device_process_ccw_queue(device, &final_queue); | |
a4d26c6a | 2140 | __dasd_device_check_path_events(device); |
1da177e4 LT |
2141 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2142 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
2143 | __dasd_device_process_final_queue(device, &final_queue); |
2144 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 2145 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
2146 | __dasd_device_start_head(device); |
2147 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
4679e893 SH |
2148 | if (waitqueue_active(&shutdown_waitq)) |
2149 | wake_up(&shutdown_waitq); | |
1da177e4 LT |
2150 | dasd_put_device(device); |
2151 | } | |
2152 | ||
2153 | /* | |
2154 | * Schedules a call to dasd_tasklet over the device tasklet. | |
2155 | */ | |
8e09f215 | 2156 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
2157 | { |
2158 | /* Protect against rescheduling. */ | |
973bd993 | 2159 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
2160 | return; |
2161 | dasd_get_device(device); | |
2162 | tasklet_hi_schedule(&device->tasklet); | |
2163 | } | |
7048a2b5 | 2164 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
1da177e4 | 2165 | |
eb6e199b SW |
2166 | void dasd_device_set_stop_bits(struct dasd_device *device, int bits) |
2167 | { | |
2168 | device->stopped |= bits; | |
2169 | } | |
2170 | EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); | |
2171 | ||
2172 | void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) | |
2173 | { | |
2174 | device->stopped &= ~bits; | |
2175 | if (!device->stopped) | |
2176 | wake_up(&generic_waitq); | |
2177 | } | |
2178 | EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); | |
2179 | ||
1da177e4 | 2180 | /* |
8e09f215 SW |
2181 | * Queue a request to the head of the device ccw_queue. |
2182 | * Start the I/O if possible. | |
1da177e4 | 2183 | */ |
8e09f215 | 2184 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2185 | { |
2186 | struct dasd_device *device; | |
2187 | unsigned long flags; | |
2188 | ||
8e09f215 | 2189 | device = cqr->startdev; |
1da177e4 | 2190 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
2191 | cqr->status = DASD_CQR_QUEUED; |
2192 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 2193 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2194 | dasd_schedule_device_bh(device); |
1da177e4 LT |
2195 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
2196 | } | |
7048a2b5 | 2197 | EXPORT_SYMBOL(dasd_add_request_head); |
1da177e4 LT |
2198 | |
2199 | /* | |
8e09f215 SW |
2200 | * Queue a request to the tail of the device ccw_queue. |
2201 | * Start the I/O if possible. | |
1da177e4 | 2202 | */ |
8e09f215 | 2203 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2204 | { |
2205 | struct dasd_device *device; | |
2206 | unsigned long flags; | |
2207 | ||
8e09f215 | 2208 | device = cqr->startdev; |
1da177e4 | 2209 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
2210 | cqr->status = DASD_CQR_QUEUED; |
2211 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 2212 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2213 | dasd_schedule_device_bh(device); |
1da177e4 LT |
2214 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
2215 | } | |
7048a2b5 | 2216 | EXPORT_SYMBOL(dasd_add_request_tail); |
1da177e4 LT |
2217 | |
2218 | /* | |
8e09f215 | 2219 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 2220 | */ |
5915a873 | 2221 | void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 | 2222 | { |
1c1e093c SW |
2223 | spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); |
2224 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
2225 | spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); | |
2226 | wake_up(&generic_waitq); | |
1da177e4 | 2227 | } |
5915a873 | 2228 | EXPORT_SYMBOL_GPL(dasd_wakeup_cb); |
1da177e4 | 2229 | |
8e09f215 | 2230 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
2231 | { |
2232 | struct dasd_device *device; | |
2233 | int rc; | |
2234 | ||
8e09f215 | 2235 | device = cqr->startdev; |
1da177e4 | 2236 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1c1e093c | 2237 | rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); |
1da177e4 LT |
2238 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2239 | return rc; | |
2240 | } | |
2241 | ||
2242 | /* | |
eb6e199b | 2243 | * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. |
1da177e4 | 2244 | */ |
eb6e199b | 2245 | static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) |
1da177e4 | 2246 | { |
1da177e4 | 2247 | struct dasd_device *device; |
eb6e199b | 2248 | dasd_erp_fn_t erp_fn; |
138c014d | 2249 | |
eb6e199b SW |
2250 | if (cqr->status == DASD_CQR_FILLED) |
2251 | return 0; | |
8e09f215 | 2252 | device = cqr->startdev; |
eb6e199b SW |
2253 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { |
2254 | if (cqr->status == DASD_CQR_TERMINATED) { | |
2255 | device->discipline->handle_terminated_request(cqr); | |
2256 | return 1; | |
2257 | } | |
2258 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
2259 | erp_fn = device->discipline->erp_action(cqr); | |
2260 | erp_fn(cqr); | |
2261 | return 1; | |
2262 | } | |
2263 | if (cqr->status == DASD_CQR_FAILED) | |
2264 | dasd_log_sense(cqr, &cqr->irb); | |
2265 | if (cqr->refers) { | |
2266 | __dasd_process_erp(device, cqr); | |
2267 | return 1; | |
2268 | } | |
2269 | } | |
2270 | return 0; | |
2271 | } | |
138c014d | 2272 | |
eb6e199b SW |
2273 | static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) |
2274 | { | |
2275 | if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { | |
2276 | if (cqr->refers) /* erp is not done yet */ | |
2277 | return 1; | |
2278 | return ((cqr->status != DASD_CQR_DONE) && | |
2279 | (cqr->status != DASD_CQR_FAILED)); | |
2280 | } else | |
2281 | return (cqr->status == DASD_CQR_FILLED); | |
2282 | } | |
138c014d | 2283 | |
eb6e199b SW |
2284 | static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) |
2285 | { | |
2286 | struct dasd_device *device; | |
2287 | int rc; | |
2288 | struct list_head ccw_queue; | |
2289 | struct dasd_ccw_req *cqr; | |
2290 | ||
2291 | INIT_LIST_HEAD(&ccw_queue); | |
2292 | maincqr->status = DASD_CQR_FILLED; | |
2293 | device = maincqr->startdev; | |
2294 | list_add(&maincqr->blocklist, &ccw_queue); | |
2295 | for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); | |
2296 | cqr = list_first_entry(&ccw_queue, | |
2297 | struct dasd_ccw_req, blocklist)) { | |
2298 | ||
2299 | if (__dasd_sleep_on_erp(cqr)) | |
2300 | continue; | |
2301 | if (cqr->status != DASD_CQR_FILLED) /* could be failed */ | |
2302 | continue; | |
5a27e60d SW |
2303 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
2304 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2305 | cqr->status = DASD_CQR_FAILED; | |
2306 | cqr->intrc = -EPERM; | |
2307 | continue; | |
2308 | } | |
eb6e199b SW |
2309 | /* Non-temporary stop condition will trigger fail fast */ |
2310 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
2311 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2312 | (!dasd_eer_enabled(device))) { | |
2313 | cqr->status = DASD_CQR_FAILED; | |
d1ffc1f8 | 2314 | cqr->intrc = -ENOLINK; |
eb6e199b SW |
2315 | continue; |
2316 | } | |
a9f6273f SH |
2317 | /* |
2318 | * Don't try to start requests if device is in | |
2319 | * offline processing, it might wait forever | |
2320 | */ | |
2321 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2322 | cqr->status = DASD_CQR_FAILED; | |
2323 | cqr->intrc = -ENODEV; | |
2324 | continue; | |
2325 | } | |
df3044f1 SH |
2326 | /* |
2327 | * Don't try to start requests if device is stopped | |
2328 | * except path verification requests | |
2329 | */ | |
2330 | if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { | |
2331 | if (interruptible) { | |
2332 | rc = wait_event_interruptible( | |
2333 | generic_waitq, !(device->stopped)); | |
2334 | if (rc == -ERESTARTSYS) { | |
2335 | cqr->status = DASD_CQR_FAILED; | |
2336 | maincqr->intrc = rc; | |
2337 | continue; | |
2338 | } | |
2339 | } else | |
2340 | wait_event(generic_waitq, !(device->stopped)); | |
2341 | } | |
5915a873 SH |
2342 | if (!cqr->callback) |
2343 | cqr->callback = dasd_wakeup_cb; | |
2344 | ||
1c1e093c | 2345 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
eb6e199b SW |
2346 | dasd_add_request_tail(cqr); |
2347 | if (interruptible) { | |
2348 | rc = wait_event_interruptible( | |
2349 | generic_waitq, _wait_for_wakeup(cqr)); | |
2350 | if (rc == -ERESTARTSYS) { | |
2351 | dasd_cancel_req(cqr); | |
2352 | /* wait (non-interruptible) for final status */ | |
2353 | wait_event(generic_waitq, | |
2354 | _wait_for_wakeup(cqr)); | |
2355 | cqr->status = DASD_CQR_FAILED; | |
2356 | maincqr->intrc = rc; | |
2357 | continue; | |
2358 | } | |
2359 | } else | |
2360 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); | |
2361 | } | |
2362 | ||
1aae0560 | 2363 | maincqr->endclk = get_tod_clock(); |
eb6e199b SW |
2364 | if ((maincqr->status != DASD_CQR_DONE) && |
2365 | (maincqr->intrc != -ERESTARTSYS)) | |
2366 | dasd_log_sense(maincqr, &maincqr->irb); | |
2367 | if (maincqr->status == DASD_CQR_DONE) | |
6cc7f168 | 2368 | rc = 0; |
eb6e199b SW |
2369 | else if (maincqr->intrc) |
2370 | rc = maincqr->intrc; | |
6cc7f168 SW |
2371 | else |
2372 | rc = -EIO; | |
1da177e4 LT |
2373 | return rc; |
2374 | } | |
2375 | ||
d42e1712 SH |
2376 | static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue) |
2377 | { | |
2378 | struct dasd_ccw_req *cqr; | |
2379 | ||
2380 | list_for_each_entry(cqr, ccw_queue, blocklist) { | |
2381 | if (cqr->callback_data != DASD_SLEEPON_END_TAG) | |
2382 | return 0; | |
2383 | } | |
2384 | ||
2385 | return 1; | |
2386 | } | |
2387 | ||
2388 | static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible) | |
2389 | { | |
2390 | struct dasd_device *device; | |
d42e1712 | 2391 | struct dasd_ccw_req *cqr, *n; |
8fd57520 | 2392 | u8 *sense = NULL; |
362ce84f | 2393 | int rc; |
d42e1712 SH |
2394 | |
2395 | retry: | |
2396 | list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { | |
2397 | device = cqr->startdev; | |
2398 | if (cqr->status != DASD_CQR_FILLED) /*could be failed*/ | |
2399 | continue; | |
2400 | ||
2401 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && | |
2402 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2403 | cqr->status = DASD_CQR_FAILED; | |
2404 | cqr->intrc = -EPERM; | |
2405 | continue; | |
2406 | } | |
2407 | /*Non-temporary stop condition will trigger fail fast*/ | |
2408 | if (device->stopped & ~DASD_STOPPED_PENDING && | |
2409 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2410 | !dasd_eer_enabled(device)) { | |
2411 | cqr->status = DASD_CQR_FAILED; | |
2412 | cqr->intrc = -EAGAIN; | |
2413 | continue; | |
2414 | } | |
2415 | ||
2416 | /*Don't try to start requests if device is stopped*/ | |
2417 | if (interruptible) { | |
2418 | rc = wait_event_interruptible( | |
2419 | generic_waitq, !device->stopped); | |
2420 | if (rc == -ERESTARTSYS) { | |
2421 | cqr->status = DASD_CQR_FAILED; | |
2422 | cqr->intrc = rc; | |
2423 | continue; | |
2424 | } | |
2425 | } else | |
2426 | wait_event(generic_waitq, !(device->stopped)); | |
2427 | ||
2428 | if (!cqr->callback) | |
2429 | cqr->callback = dasd_wakeup_cb; | |
2430 | cqr->callback_data = DASD_SLEEPON_START_TAG; | |
2431 | dasd_add_request_tail(cqr); | |
2432 | } | |
2433 | ||
2434 | wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue)); | |
2435 | ||
2436 | rc = 0; | |
2437 | list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { | |
8fd57520 JH |
2438 | /* |
2439 | * In some cases the 'File Protected' or 'Incorrect Length' | |
2440 | * error might be expected and error recovery would be | |
2441 | * unnecessary in these cases. Check if the according suppress | |
2442 | * bit is set. | |
2443 | */ | |
2444 | sense = dasd_get_sense(&cqr->irb); | |
2445 | if (sense && sense[1] & SNS1_FILE_PROTECTED && | |
2446 | test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags)) | |
2447 | continue; | |
2448 | if (scsw_cstat(&cqr->irb.scsw) == 0x40 && | |
2449 | test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags)) | |
2450 | continue; | |
2451 | ||
29b8dd9d SH |
2452 | /* |
2453 | * for alias devices simplify error recovery and | |
2454 | * return to upper layer | |
362ce84f | 2455 | * do not skip ERP requests |
29b8dd9d | 2456 | */ |
362ce84f | 2457 | if (cqr->startdev != cqr->basedev && !cqr->refers && |
29b8dd9d SH |
2458 | (cqr->status == DASD_CQR_TERMINATED || |
2459 | cqr->status == DASD_CQR_NEED_ERP)) | |
2460 | return -EAGAIN; | |
362ce84f SH |
2461 | |
2462 | /* normal recovery for basedev IO */ | |
590aeedd SH |
2463 | if (__dasd_sleep_on_erp(cqr)) |
2464 | /* handle erp first */ | |
362ce84f | 2465 | goto retry; |
d42e1712 | 2466 | } |
362ce84f | 2467 | |
d42e1712 SH |
2468 | return 0; |
2469 | } | |
2470 | ||
eb6e199b SW |
2471 | /* |
2472 | * Queue a request to the tail of the device ccw_queue and wait for | |
2473 | * it's completion. | |
2474 | */ | |
2475 | int dasd_sleep_on(struct dasd_ccw_req *cqr) | |
2476 | { | |
2477 | return _dasd_sleep_on(cqr, 0); | |
2478 | } | |
7048a2b5 | 2479 | EXPORT_SYMBOL(dasd_sleep_on); |
eb6e199b | 2480 | |
d42e1712 SH |
2481 | /* |
2482 | * Start requests from a ccw_queue and wait for their completion. | |
2483 | */ | |
2484 | int dasd_sleep_on_queue(struct list_head *ccw_queue) | |
2485 | { | |
2486 | return _dasd_sleep_on_queue(ccw_queue, 0); | |
2487 | } | |
2488 | EXPORT_SYMBOL(dasd_sleep_on_queue); | |
2489 | ||
1da177e4 | 2490 | /* |
8e09f215 SW |
2491 | * Queue a request to the tail of the device ccw_queue and wait |
2492 | * interruptible for it's completion. | |
1da177e4 | 2493 | */ |
8e09f215 | 2494 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 | 2495 | { |
eb6e199b | 2496 | return _dasd_sleep_on(cqr, 1); |
1da177e4 | 2497 | } |
7048a2b5 | 2498 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); |
1da177e4 LT |
2499 | |
2500 | /* | |
2501 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
2502 | * for eckd devices) the currently running request has to be terminated | |
2503 | * and be put back to status queued, before the special request is added | |
2504 | * to the head of the queue. Then the special request is waited on normally. | |
2505 | */ | |
8e09f215 | 2506 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
2507 | { |
2508 | struct dasd_ccw_req *cqr; | |
aade6c0d | 2509 | int rc; |
1da177e4 LT |
2510 | |
2511 | if (list_empty(&device->ccw_queue)) | |
2512 | return 0; | |
8e09f215 | 2513 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
aade6c0d SH |
2514 | rc = device->discipline->term_IO(cqr); |
2515 | if (!rc) | |
2516 | /* | |
2517 | * CQR terminated because a more important request is pending. | |
2518 | * Undo decreasing of retry counter because this is | |
2519 | * not an error case. | |
2520 | */ | |
2521 | cqr->retries++; | |
2522 | return rc; | |
1da177e4 LT |
2523 | } |
2524 | ||
8e09f215 | 2525 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 | 2526 | { |
1da177e4 LT |
2527 | struct dasd_device *device; |
2528 | int rc; | |
138c014d | 2529 | |
8e09f215 | 2530 | device = cqr->startdev; |
5a27e60d SW |
2531 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && |
2532 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2533 | cqr->status = DASD_CQR_FAILED; | |
2534 | cqr->intrc = -EPERM; | |
2535 | return -EIO; | |
2536 | } | |
1da177e4 LT |
2537 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
2538 | rc = _dasd_term_running_cqr(device); | |
2539 | if (rc) { | |
2540 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
2541 | return rc; | |
2542 | } | |
1da177e4 | 2543 | cqr->callback = dasd_wakeup_cb; |
1c1e093c | 2544 | cqr->callback_data = DASD_SLEEPON_START_TAG; |
1da177e4 | 2545 | cqr->status = DASD_CQR_QUEUED; |
214b8ffc SH |
2546 | /* |
2547 | * add new request as second | |
2548 | * first the terminated cqr needs to be finished | |
2549 | */ | |
2550 | list_add(&cqr->devlist, device->ccw_queue.next); | |
138c014d | 2551 | |
1da177e4 | 2552 | /* let the bh start the request to keep them in order */ |
8e09f215 | 2553 | dasd_schedule_device_bh(device); |
138c014d | 2554 | |
1da177e4 LT |
2555 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
2556 | ||
c80ee724 | 2557 | wait_event(generic_waitq, _wait_for_wakeup(cqr)); |
138c014d | 2558 | |
6cc7f168 SW |
2559 | if (cqr->status == DASD_CQR_DONE) |
2560 | rc = 0; | |
2561 | else if (cqr->intrc) | |
2562 | rc = cqr->intrc; | |
2563 | else | |
2564 | rc = -EIO; | |
0e003b70 SH |
2565 | |
2566 | /* kick tasklets */ | |
2567 | dasd_schedule_device_bh(device); | |
2568 | if (device->block) | |
2569 | dasd_schedule_block_bh(device->block); | |
2570 | ||
1da177e4 LT |
2571 | return rc; |
2572 | } | |
7048a2b5 | 2573 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); |
1da177e4 LT |
2574 | |
2575 | /* | |
2576 | * Cancels a request that was started with dasd_sleep_on_req. | |
2577 | * This is useful to timeout requests. The request will be | |
2578 | * terminated if it is currently in i/o. | |
b99a946d | 2579 | * Returns 0 if request termination was successful |
8e09f215 SW |
2580 | * negative error code if termination failed |
2581 | * Cancellation of a request is an asynchronous operation! The calling | |
2582 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 2583 | */ |
8e09f215 | 2584 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 2585 | { |
8e09f215 | 2586 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
2587 | unsigned long flags; |
2588 | int rc; | |
2589 | ||
2590 | rc = 0; | |
2591 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
2592 | switch (cqr->status) { | |
2593 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
2594 | /* request was not started - just set to cleared */ |
2595 | cqr->status = DASD_CQR_CLEARED; | |
931a3dce SH |
2596 | if (cqr->callback_data == DASD_SLEEPON_START_TAG) |
2597 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
1da177e4 LT |
2598 | break; |
2599 | case DASD_CQR_IN_IO: | |
2600 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
2601 | rc = device->discipline->term_IO(cqr); |
2602 | if (rc) { | |
fc19f381 SH |
2603 | dev_err(&device->cdev->dev, |
2604 | "Cancelling request %p failed with rc=%d\n", | |
2605 | cqr, rc); | |
8e09f215 | 2606 | } else { |
1aae0560 | 2607 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 2608 | } |
1da177e4 | 2609 | break; |
8e09f215 | 2610 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 2611 | break; |
8e09f215 SW |
2612 | } |
2613 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
2614 | dasd_schedule_device_bh(device); | |
2615 | return rc; | |
2616 | } | |
7048a2b5 | 2617 | EXPORT_SYMBOL(dasd_cancel_req); |
8e09f215 | 2618 | |
8e09f215 SW |
2619 | /* |
2620 | * SECTION: Operations of the dasd_block layer. | |
2621 | */ | |
2622 | ||
2623 | /* | |
2624 | * Timeout function for dasd_block. This is used when the block layer | |
2625 | * is waiting for something that may not come reliably, (e.g. a state | |
2626 | * change interrupt) | |
2627 | */ | |
e99e88a9 | 2628 | static void dasd_block_timeout(struct timer_list *t) |
8e09f215 SW |
2629 | { |
2630 | unsigned long flags; | |
2631 | struct dasd_block *block; | |
2632 | ||
e99e88a9 | 2633 | block = from_timer(block, t, timer); |
8e09f215 SW |
2634 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); |
2635 | /* re-activate request queue */ | |
eb6e199b | 2636 | dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); |
8e09f215 SW |
2637 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); |
2638 | dasd_schedule_block_bh(block); | |
e443343e | 2639 | blk_mq_run_hw_queues(block->request_queue, true); |
8e09f215 SW |
2640 | } |
2641 | ||
2642 | /* | |
2643 | * Setup timeout for a dasd_block in jiffies. | |
2644 | */ | |
2645 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
2646 | { | |
48cae885 SW |
2647 | if (expires == 0) |
2648 | del_timer(&block->timer); | |
2649 | else | |
2650 | mod_timer(&block->timer, jiffies + expires); | |
8e09f215 | 2651 | } |
7048a2b5 | 2652 | EXPORT_SYMBOL(dasd_block_set_timer); |
8e09f215 SW |
2653 | |
2654 | /* | |
2655 | * Clear timeout for a dasd_block. | |
2656 | */ | |
2657 | void dasd_block_clear_timer(struct dasd_block *block) | |
2658 | { | |
48cae885 | 2659 | del_timer(&block->timer); |
8e09f215 | 2660 | } |
7048a2b5 | 2661 | EXPORT_SYMBOL(dasd_block_clear_timer); |
8e09f215 | 2662 | |
8e09f215 SW |
2663 | /* |
2664 | * Process finished error recovery ccw. | |
2665 | */ | |
eb6e199b SW |
2666 | static void __dasd_process_erp(struct dasd_device *device, |
2667 | struct dasd_ccw_req *cqr) | |
8e09f215 SW |
2668 | { |
2669 | dasd_erp_fn_t erp_fn; | |
8e09f215 SW |
2670 | |
2671 | if (cqr->status == DASD_CQR_DONE) | |
2672 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
2673 | else | |
fc19f381 | 2674 | dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); |
8e09f215 SW |
2675 | erp_fn = device->discipline->erp_postaction(cqr); |
2676 | erp_fn(cqr); | |
2677 | } | |
1da177e4 | 2678 | |
8e09f215 SW |
2679 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) |
2680 | { | |
2681 | struct request *req; | |
2a842aca | 2682 | blk_status_t error = BLK_STS_OK; |
e443343e | 2683 | int status; |
8e09f215 SW |
2684 | |
2685 | req = (struct request *) cqr->callback_data; | |
2686 | dasd_profile_end(cqr->block, cqr, req); | |
2a842aca | 2687 | |
fe6b8e76 | 2688 | status = cqr->block->base->discipline->free_cp(cqr, req); |
d1ffc1f8 | 2689 | if (status < 0) |
2a842aca | 2690 | error = errno_to_blk_status(status); |
d1ffc1f8 | 2691 | else if (status == 0) { |
2a842aca CH |
2692 | switch (cqr->intrc) { |
2693 | case -EPERM: | |
2694 | error = BLK_STS_NEXUS; | |
2695 | break; | |
2696 | case -ENOLINK: | |
2697 | error = BLK_STS_TRANSPORT; | |
2698 | break; | |
2699 | case -ETIMEDOUT: | |
2700 | error = BLK_STS_TIMEOUT; | |
2701 | break; | |
2702 | default: | |
2703 | error = BLK_STS_IOERR; | |
2704 | break; | |
2705 | } | |
d1ffc1f8 | 2706 | } |
e443343e SH |
2707 | |
2708 | /* | |
2709 | * We need to take care for ETIMEDOUT errors here since the | |
2710 | * complete callback does not get called in this case. | |
2711 | * Take care of all errors here and avoid additional code to | |
2712 | * transfer the error value to the complete callback. | |
2713 | */ | |
2714 | if (error) { | |
2715 | blk_mq_end_request(req, error); | |
2716 | blk_mq_run_hw_queues(req->q, true); | |
2717 | } else { | |
2718 | blk_mq_complete_request(req); | |
2719 | } | |
8e09f215 SW |
2720 | } |
2721 | ||
2722 | /* | |
2723 | * Process ccw request queue. | |
2724 | */ | |
2725 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
2726 | struct list_head *final_queue) | |
2727 | { | |
2728 | struct list_head *l, *n; | |
2729 | struct dasd_ccw_req *cqr; | |
2730 | dasd_erp_fn_t erp_fn; | |
2731 | unsigned long flags; | |
2732 | struct dasd_device *base = block->base; | |
2733 | ||
2734 | restart: | |
2735 | /* Process request with final status. */ | |
2736 | list_for_each_safe(l, n, &block->ccw_queue) { | |
2737 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
2738 | if (cqr->status != DASD_CQR_DONE && | |
2739 | cqr->status != DASD_CQR_FAILED && | |
2740 | cqr->status != DASD_CQR_NEED_ERP && | |
2741 | cqr->status != DASD_CQR_TERMINATED) | |
2742 | continue; | |
2743 | ||
2744 | if (cqr->status == DASD_CQR_TERMINATED) { | |
2745 | base->discipline->handle_terminated_request(cqr); | |
2746 | goto restart; | |
2747 | } | |
2748 | ||
2749 | /* Process requests that may be recovered */ | |
2750 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
6c5f57c7 | 2751 | erp_fn = base->discipline->erp_action(cqr); |
6a5176c4 SH |
2752 | if (IS_ERR(erp_fn(cqr))) |
2753 | continue; | |
8e09f215 SW |
2754 | goto restart; |
2755 | } | |
2756 | ||
a9cffb22 SH |
2757 | /* log sense for fatal error */ |
2758 | if (cqr->status == DASD_CQR_FAILED) { | |
2759 | dasd_log_sense(cqr, &cqr->irb); | |
2760 | } | |
2761 | ||
8e09f215 SW |
2762 | /* First of all call extended error reporting. */ |
2763 | if (dasd_eer_enabled(base) && | |
2764 | cqr->status == DASD_CQR_FAILED) { | |
2765 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
2766 | ||
2767 | /* restart request */ | |
2768 | cqr->status = DASD_CQR_FILLED; | |
2769 | cqr->retries = 255; | |
2770 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
eb6e199b | 2771 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 SW |
2772 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
2773 | flags); | |
2774 | goto restart; | |
2775 | } | |
2776 | ||
2777 | /* Process finished ERP request. */ | |
2778 | if (cqr->refers) { | |
eb6e199b | 2779 | __dasd_process_erp(base, cqr); |
8e09f215 SW |
2780 | goto restart; |
2781 | } | |
2782 | ||
2783 | /* Rechain finished requests to final queue */ | |
1aae0560 | 2784 | cqr->endclk = get_tod_clock(); |
8e09f215 SW |
2785 | list_move_tail(&cqr->blocklist, final_queue); |
2786 | } | |
2787 | } | |
2788 | ||
2789 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
2790 | { | |
2791 | dasd_schedule_block_bh(cqr->block); | |
2792 | } | |
2793 | ||
2794 | static void __dasd_block_start_head(struct dasd_block *block) | |
2795 | { | |
2796 | struct dasd_ccw_req *cqr; | |
2797 | ||
2798 | if (list_empty(&block->ccw_queue)) | |
2799 | return; | |
2800 | /* We allways begin with the first requests on the queue, as some | |
2801 | * of previously started requests have to be enqueued on a | |
2802 | * dasd_device again for error recovery. | |
2803 | */ | |
2804 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
2805 | if (cqr->status != DASD_CQR_FILLED) | |
2806 | continue; | |
5a27e60d SW |
2807 | if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && |
2808 | !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { | |
2809 | cqr->status = DASD_CQR_FAILED; | |
2810 | cqr->intrc = -EPERM; | |
2811 | dasd_schedule_block_bh(block); | |
2812 | continue; | |
2813 | } | |
8e09f215 SW |
2814 | /* Non-temporary stop condition will trigger fail fast */ |
2815 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
2816 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
2817 | (!dasd_eer_enabled(block->base))) { | |
2818 | cqr->status = DASD_CQR_FAILED; | |
d1ffc1f8 | 2819 | cqr->intrc = -ENOLINK; |
8e09f215 SW |
2820 | dasd_schedule_block_bh(block); |
2821 | continue; | |
2822 | } | |
2823 | /* Don't try to start requests if device is stopped */ | |
2824 | if (block->base->stopped) | |
2825 | return; | |
2826 | ||
2827 | /* just a fail safe check, should not happen */ | |
2828 | if (!cqr->startdev) | |
2829 | cqr->startdev = block->base; | |
2830 | ||
2831 | /* make sure that the requests we submit find their way back */ | |
2832 | cqr->callback = dasd_return_cqr_cb; | |
2833 | ||
2834 | dasd_add_request_tail(cqr); | |
2835 | } | |
2836 | } | |
2837 | ||
2838 | /* | |
2839 | * Central dasd_block layer routine. Takes requests from the generic | |
2840 | * block layer request queue, creates ccw requests, enqueues them on | |
2841 | * a dasd_device and processes ccw requests that have been returned. | |
2842 | */ | |
2843 | static void dasd_block_tasklet(struct dasd_block *block) | |
2844 | { | |
2845 | struct list_head final_queue; | |
2846 | struct list_head *l, *n; | |
2847 | struct dasd_ccw_req *cqr; | |
e443343e | 2848 | struct dasd_queue *dq; |
8e09f215 SW |
2849 | |
2850 | atomic_set(&block->tasklet_scheduled, 0); | |
2851 | INIT_LIST_HEAD(&final_queue); | |
e443343e | 2852 | spin_lock_irq(&block->queue_lock); |
8e09f215 SW |
2853 | /* Finish off requests on ccw queue */ |
2854 | __dasd_process_block_ccw_queue(block, &final_queue); | |
e443343e SH |
2855 | spin_unlock_irq(&block->queue_lock); |
2856 | ||
8e09f215 | 2857 | /* Now call the callback function of requests with final status */ |
8e09f215 SW |
2858 | list_for_each_safe(l, n, &final_queue) { |
2859 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
e443343e SH |
2860 | dq = cqr->dq; |
2861 | spin_lock_irq(&dq->lock); | |
8e09f215 SW |
2862 | list_del_init(&cqr->blocklist); |
2863 | __dasd_cleanup_cqr(cqr); | |
e443343e | 2864 | spin_unlock_irq(&dq->lock); |
8e09f215 | 2865 | } |
e443343e SH |
2866 | |
2867 | spin_lock_irq(&block->queue_lock); | |
8e09f215 SW |
2868 | /* Now check if the head of the ccw queue needs to be started. */ |
2869 | __dasd_block_start_head(block); | |
e443343e SH |
2870 | spin_unlock_irq(&block->queue_lock); |
2871 | ||
4679e893 SH |
2872 | if (waitqueue_active(&shutdown_waitq)) |
2873 | wake_up(&shutdown_waitq); | |
8e09f215 SW |
2874 | dasd_put_device(block->base); |
2875 | } | |
2876 | ||
2877 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
2878 | { | |
2879 | wake_up(&dasd_flush_wq); | |
2880 | } | |
2881 | ||
c5576876 SH |
2882 | /* |
2883 | * Requeue a request back to the block request queue | |
2884 | * only works for block requests | |
2885 | */ | |
2886 | static int _dasd_requeue_request(struct dasd_ccw_req *cqr) | |
2887 | { | |
2888 | struct dasd_block *block = cqr->block; | |
2889 | struct request *req; | |
c5576876 SH |
2890 | |
2891 | if (!block) | |
2892 | return -EINVAL; | |
e443343e | 2893 | spin_lock_irq(&cqr->dq->lock); |
c5576876 | 2894 | req = (struct request *) cqr->callback_data; |
e443343e SH |
2895 | blk_mq_requeue_request(req, false); |
2896 | spin_unlock_irq(&cqr->dq->lock); | |
c5576876 SH |
2897 | |
2898 | return 0; | |
2899 | } | |
2900 | ||
8e09f215 SW |
2901 | /* |
2902 | * Go through all request on the dasd_block request queue, cancel them | |
2903 | * on the respective dasd_device, and return them to the generic | |
2904 | * block layer. | |
2905 | */ | |
2906 | static int dasd_flush_block_queue(struct dasd_block *block) | |
2907 | { | |
2908 | struct dasd_ccw_req *cqr, *n; | |
2909 | int rc, i; | |
2910 | struct list_head flush_queue; | |
e443343e | 2911 | unsigned long flags; |
8e09f215 SW |
2912 | |
2913 | INIT_LIST_HEAD(&flush_queue); | |
2914 | spin_lock_bh(&block->queue_lock); | |
2915 | rc = 0; | |
2916 | restart: | |
2917 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
2918 | /* if this request currently owned by a dasd_device cancel it */ | |
2919 | if (cqr->status >= DASD_CQR_QUEUED) | |
2920 | rc = dasd_cancel_req(cqr); | |
2921 | if (rc < 0) | |
2922 | break; | |
2923 | /* Rechain request (including erp chain) so it won't be | |
2924 | * touched by the dasd_block_tasklet anymore. | |
2925 | * Replace the callback so we notice when the request | |
2926 | * is returned from the dasd_device layer. | |
2927 | */ | |
2928 | cqr->callback = _dasd_wake_block_flush_cb; | |
2929 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
2930 | list_move_tail(&cqr->blocklist, &flush_queue); | |
2931 | if (i > 1) | |
2932 | /* moved more than one request - need to restart */ | |
2933 | goto restart; | |
2934 | } | |
2935 | spin_unlock_bh(&block->queue_lock); | |
2936 | /* Now call the callback function of flushed requests */ | |
2937 | restart_cb: | |
2938 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
2939 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
2940 | /* Process finished ERP request. */ | |
2941 | if (cqr->refers) { | |
0cd4bd47 | 2942 | spin_lock_bh(&block->queue_lock); |
eb6e199b | 2943 | __dasd_process_erp(block->base, cqr); |
0cd4bd47 | 2944 | spin_unlock_bh(&block->queue_lock); |
8e09f215 SW |
2945 | /* restart list_for_xx loop since dasd_process_erp |
2946 | * might remove multiple elements */ | |
2947 | goto restart_cb; | |
2948 | } | |
2949 | /* call the callback function */ | |
e443343e | 2950 | spin_lock_irqsave(&cqr->dq->lock, flags); |
1aae0560 | 2951 | cqr->endclk = get_tod_clock(); |
8e09f215 SW |
2952 | list_del_init(&cqr->blocklist); |
2953 | __dasd_cleanup_cqr(cqr); | |
e443343e | 2954 | spin_unlock_irqrestore(&cqr->dq->lock, flags); |
1da177e4 | 2955 | } |
1da177e4 LT |
2956 | return rc; |
2957 | } | |
2958 | ||
2959 | /* | |
8e09f215 SW |
2960 | * Schedules a call to dasd_tasklet over the device tasklet. |
2961 | */ | |
2962 | void dasd_schedule_block_bh(struct dasd_block *block) | |
2963 | { | |
2964 | /* Protect against rescheduling. */ | |
2965 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
2966 | return; | |
2967 | /* life cycle of block is bound to it's base device */ | |
2968 | dasd_get_device(block->base); | |
2969 | tasklet_hi_schedule(&block->tasklet); | |
2970 | } | |
7048a2b5 | 2971 | EXPORT_SYMBOL(dasd_schedule_block_bh); |
8e09f215 SW |
2972 | |
2973 | ||
2974 | /* | |
2975 | * SECTION: external block device operations | |
2976 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
2977 | */ |
2978 | ||
2979 | /* | |
2980 | * Dasd request queue function. Called from ll_rw_blk.c | |
2981 | */ | |
e443343e SH |
2982 | static blk_status_t do_dasd_request(struct blk_mq_hw_ctx *hctx, |
2983 | const struct blk_mq_queue_data *qd) | |
1da177e4 | 2984 | { |
e443343e SH |
2985 | struct dasd_block *block = hctx->queue->queuedata; |
2986 | struct dasd_queue *dq = hctx->driver_data; | |
2987 | struct request *req = qd->rq; | |
2988 | struct dasd_device *basedev; | |
2989 | struct dasd_ccw_req *cqr; | |
2990 | blk_status_t rc = BLK_STS_OK; | |
2991 | ||
2992 | basedev = block->base; | |
2993 | spin_lock_irq(&dq->lock); | |
2994 | if (basedev->state < DASD_STATE_READY) { | |
2995 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
2996 | "device not ready for request %p", req); | |
2997 | rc = BLK_STS_IOERR; | |
2998 | goto out; | |
2999 | } | |
1da177e4 | 3000 | |
e443343e SH |
3001 | /* |
3002 | * if device is stopped do not fetch new requests | |
3003 | * except failfast is active which will let requests fail | |
3004 | * immediately in __dasd_block_start_head() | |
3005 | */ | |
3006 | if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST)) { | |
3007 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
3008 | "device stopped request %p", req); | |
3009 | rc = BLK_STS_RESOURCE; | |
3010 | goto out; | |
3011 | } | |
3012 | ||
3013 | if (basedev->features & DASD_FEATURE_READONLY && | |
3014 | rq_data_dir(req) == WRITE) { | |
3015 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
3016 | "Rejecting write request %p", req); | |
3017 | rc = BLK_STS_IOERR; | |
3018 | goto out; | |
3019 | } | |
3020 | ||
3021 | if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) && | |
3022 | (basedev->features & DASD_FEATURE_FAILFAST || | |
3023 | blk_noretry_request(req))) { | |
3024 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
3025 | "Rejecting failfast request %p", req); | |
3026 | rc = BLK_STS_IOERR; | |
3027 | goto out; | |
3028 | } | |
3029 | ||
3030 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
3031 | if (IS_ERR(cqr)) { | |
3032 | if (PTR_ERR(cqr) == -EBUSY || | |
3033 | PTR_ERR(cqr) == -ENOMEM || | |
3034 | PTR_ERR(cqr) == -EAGAIN) { | |
3035 | rc = BLK_STS_RESOURCE; | |
3036 | goto out; | |
3037 | } | |
3038 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
3039 | "CCW creation failed (rc=%ld) on request %p", | |
3040 | PTR_ERR(cqr), req); | |
3041 | rc = BLK_STS_IOERR; | |
3042 | goto out; | |
3043 | } | |
3044 | /* | |
3045 | * Note: callback is set to dasd_return_cqr_cb in | |
3046 | * __dasd_block_start_head to cover erp requests as well | |
3047 | */ | |
3048 | cqr->callback_data = req; | |
3049 | cqr->status = DASD_CQR_FILLED; | |
3050 | cqr->dq = dq; | |
3051 | req->completion_data = cqr; | |
3052 | blk_mq_start_request(req); | |
8e09f215 | 3053 | spin_lock(&block->queue_lock); |
e443343e SH |
3054 | list_add_tail(&cqr->blocklist, &block->ccw_queue); |
3055 | INIT_LIST_HEAD(&cqr->devlist); | |
3056 | dasd_profile_start(block, cqr, req); | |
3057 | dasd_schedule_block_bh(block); | |
8e09f215 | 3058 | spin_unlock(&block->queue_lock); |
e443343e SH |
3059 | |
3060 | out: | |
3061 | spin_unlock_irq(&dq->lock); | |
3062 | return rc; | |
1da177e4 LT |
3063 | } |
3064 | ||
a2ace466 HR |
3065 | /* |
3066 | * Block timeout callback, called from the block layer | |
3067 | * | |
a2ace466 HR |
3068 | * Return values: |
3069 | * BLK_EH_RESET_TIMER if the request should be left running | |
3070 | * BLK_EH_NOT_HANDLED if the request is handled or terminated | |
3071 | * by the driver. | |
3072 | */ | |
e443343e | 3073 | enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved) |
a2ace466 HR |
3074 | { |
3075 | struct dasd_ccw_req *cqr = req->completion_data; | |
3076 | struct dasd_block *block = req->q->queuedata; | |
3077 | struct dasd_device *device; | |
e443343e | 3078 | unsigned long flags; |
a2ace466 HR |
3079 | int rc = 0; |
3080 | ||
3081 | if (!cqr) | |
3082 | return BLK_EH_NOT_HANDLED; | |
3083 | ||
e443343e | 3084 | spin_lock_irqsave(&cqr->dq->lock, flags); |
a2ace466 | 3085 | device = cqr->startdev ? cqr->startdev : block->base; |
e443343e SH |
3086 | if (!device->blk_timeout) { |
3087 | spin_unlock_irqrestore(&cqr->dq->lock, flags); | |
3d71ad32 | 3088 | return BLK_EH_RESET_TIMER; |
e443343e | 3089 | } |
a2ace466 HR |
3090 | DBF_DEV_EVENT(DBF_WARNING, device, |
3091 | " dasd_times_out cqr %p status %x", | |
3092 | cqr, cqr->status); | |
3093 | ||
3094 | spin_lock(&block->queue_lock); | |
3095 | spin_lock(get_ccwdev_lock(device->cdev)); | |
3096 | cqr->retries = -1; | |
3097 | cqr->intrc = -ETIMEDOUT; | |
3098 | if (cqr->status >= DASD_CQR_QUEUED) { | |
3099 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
3100 | rc = dasd_cancel_req(cqr); | |
3101 | } else if (cqr->status == DASD_CQR_FILLED || | |
3102 | cqr->status == DASD_CQR_NEED_ERP) { | |
3103 | cqr->status = DASD_CQR_TERMINATED; | |
3104 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
3105 | } else if (cqr->status == DASD_CQR_IN_ERP) { | |
3106 | struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr; | |
3107 | ||
3108 | list_for_each_entry_safe(searchcqr, nextcqr, | |
3109 | &block->ccw_queue, blocklist) { | |
3110 | tmpcqr = searchcqr; | |
3111 | while (tmpcqr->refers) | |
3112 | tmpcqr = tmpcqr->refers; | |
3113 | if (tmpcqr != cqr) | |
3114 | continue; | |
3115 | /* searchcqr is an ERP request for cqr */ | |
3116 | searchcqr->retries = -1; | |
3117 | searchcqr->intrc = -ETIMEDOUT; | |
3118 | if (searchcqr->status >= DASD_CQR_QUEUED) { | |
3119 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
3120 | rc = dasd_cancel_req(searchcqr); | |
3121 | spin_lock(get_ccwdev_lock(device->cdev)); | |
3122 | } else if ((searchcqr->status == DASD_CQR_FILLED) || | |
3123 | (searchcqr->status == DASD_CQR_NEED_ERP)) { | |
3124 | searchcqr->status = DASD_CQR_TERMINATED; | |
3125 | rc = 0; | |
3126 | } else if (searchcqr->status == DASD_CQR_IN_ERP) { | |
3127 | /* | |
3128 | * Shouldn't happen; most recent ERP | |
3129 | * request is at the front of queue | |
3130 | */ | |
3131 | continue; | |
3132 | } | |
3133 | break; | |
3134 | } | |
3135 | spin_unlock(get_ccwdev_lock(device->cdev)); | |
3136 | } | |
3137 | dasd_schedule_block_bh(block); | |
3138 | spin_unlock(&block->queue_lock); | |
e443343e | 3139 | spin_unlock_irqrestore(&cqr->dq->lock, flags); |
a2ace466 HR |
3140 | |
3141 | return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED; | |
3142 | } | |
3143 | ||
e443343e SH |
3144 | static int dasd_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
3145 | unsigned int idx) | |
3146 | { | |
3147 | struct dasd_queue *dq = kzalloc(sizeof(*dq), GFP_KERNEL); | |
3148 | ||
3149 | if (!dq) | |
3150 | return -ENOMEM; | |
3151 | ||
3152 | spin_lock_init(&dq->lock); | |
3153 | hctx->driver_data = dq; | |
3154 | ||
3155 | return 0; | |
3156 | } | |
3157 | ||
3158 | static void dasd_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int idx) | |
3159 | { | |
3160 | kfree(hctx->driver_data); | |
3161 | hctx->driver_data = NULL; | |
3162 | } | |
3163 | ||
3164 | static void dasd_request_done(struct request *req) | |
3165 | { | |
3166 | blk_mq_end_request(req, 0); | |
3167 | blk_mq_run_hw_queues(req->q, true); | |
3168 | } | |
3169 | ||
3170 | static struct blk_mq_ops dasd_mq_ops = { | |
3171 | .queue_rq = do_dasd_request, | |
3172 | .complete = dasd_request_done, | |
3173 | .timeout = dasd_times_out, | |
3174 | .init_hctx = dasd_init_hctx, | |
3175 | .exit_hctx = dasd_exit_hctx, | |
3176 | }; | |
3177 | ||
1da177e4 LT |
3178 | /* |
3179 | * Allocate and initialize request queue and default I/O scheduler. | |
3180 | */ | |
8e09f215 | 3181 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 | 3182 | { |
e443343e SH |
3183 | int rc; |
3184 | ||
3185 | block->tag_set.ops = &dasd_mq_ops; | |
3186 | block->tag_set.nr_hw_queues = DASD_NR_HW_QUEUES; | |
3187 | block->tag_set.queue_depth = DASD_MAX_LCU_DEV * DASD_REQ_PER_DEV; | |
3188 | block->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
3189 | ||
3190 | rc = blk_mq_alloc_tag_set(&block->tag_set); | |
3191 | if (rc) | |
3192 | return rc; | |
3193 | ||
3194 | block->request_queue = blk_mq_init_queue(&block->tag_set); | |
3195 | if (IS_ERR(block->request_queue)) | |
3196 | return PTR_ERR(block->request_queue); | |
1da177e4 | 3197 | |
8e09f215 | 3198 | block->request_queue->queuedata = block; |
1da177e4 | 3199 | |
a5fd8ddc | 3200 | return 0; |
1da177e4 LT |
3201 | } |
3202 | ||
3203 | /* | |
3204 | * Allocate and initialize request queue. | |
3205 | */ | |
8e09f215 | 3206 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 | 3207 | { |
28b841b3 | 3208 | unsigned int logical_block_size = block->bp_block; |
62ba6f85 | 3209 | struct request_queue *q = block->request_queue; |
28b841b3 | 3210 | unsigned int max_bytes, max_discard_sectors; |
1da177e4 LT |
3211 | int max; |
3212 | ||
e4dbb0f2 SH |
3213 | if (block->base->features & DASD_FEATURE_USERAW) { |
3214 | /* | |
3215 | * the max_blocks value for raw_track access is 256 | |
3216 | * it is higher than the native ECKD value because we | |
3217 | * only need one ccw per track | |
3218 | * so the max_hw_sectors are | |
3219 | * 2048 x 512B = 1024kB = 16 tracks | |
3220 | */ | |
3221 | max = 2048; | |
3222 | } else { | |
3223 | max = block->base->discipline->max_blocks << block->s2b_shift; | |
3224 | } | |
62ba6f85 JH |
3225 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
3226 | q->limits.max_dev_sectors = max; | |
28b841b3 | 3227 | blk_queue_logical_block_size(q, logical_block_size); |
62ba6f85 JH |
3228 | blk_queue_max_hw_sectors(q, max); |
3229 | blk_queue_max_segments(q, USHRT_MAX); | |
f3eb5384 SW |
3230 | /* with page sized segments we can translate each segement into |
3231 | * one idaw/tidaw | |
3232 | */ | |
62ba6f85 JH |
3233 | blk_queue_max_segment_size(q, PAGE_SIZE); |
3234 | blk_queue_segment_boundary(q, PAGE_SIZE - 1); | |
28b841b3 JH |
3235 | |
3236 | /* Only activate blocklayer discard support for devices that support it */ | |
3237 | if (block->base->features & DASD_FEATURE_DISCARD) { | |
3238 | q->limits.discard_granularity = logical_block_size; | |
3239 | q->limits.discard_alignment = PAGE_SIZE; | |
3240 | ||
3241 | /* Calculate max_discard_sectors and make it PAGE aligned */ | |
3242 | max_bytes = USHRT_MAX * logical_block_size; | |
3243 | max_bytes = ALIGN(max_bytes, PAGE_SIZE) - PAGE_SIZE; | |
3244 | max_discard_sectors = max_bytes / logical_block_size; | |
3245 | ||
3246 | blk_queue_max_discard_sectors(q, max_discard_sectors); | |
3247 | blk_queue_max_write_zeroes_sectors(q, max_discard_sectors); | |
3248 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
3249 | } | |
1da177e4 LT |
3250 | } |
3251 | ||
3252 | /* | |
3253 | * Deactivate and free request queue. | |
3254 | */ | |
8e09f215 | 3255 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 3256 | { |
8e09f215 SW |
3257 | if (block->request_queue) { |
3258 | blk_cleanup_queue(block->request_queue); | |
e443343e | 3259 | blk_mq_free_tag_set(&block->tag_set); |
8e09f215 | 3260 | block->request_queue = NULL; |
1da177e4 LT |
3261 | } |
3262 | } | |
3263 | ||
57a7c0bc | 3264 | static int dasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 3265 | { |
9eb25122 | 3266 | struct dasd_device *base; |
1da177e4 LT |
3267 | int rc; |
3268 | ||
65f8da47 SW |
3269 | base = dasd_device_from_gendisk(bdev->bd_disk); |
3270 | if (!base) | |
9eb25122 SH |
3271 | return -ENODEV; |
3272 | ||
65f8da47 | 3273 | atomic_inc(&base->block->open_count); |
8e09f215 | 3274 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { |
1da177e4 LT |
3275 | rc = -ENODEV; |
3276 | goto unlock; | |
3277 | } | |
3278 | ||
8e09f215 | 3279 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
3280 | rc = -EINVAL; |
3281 | goto unlock; | |
3282 | } | |
3283 | ||
3284 | if (dasd_probeonly) { | |
fc19f381 SH |
3285 | dev_info(&base->cdev->dev, |
3286 | "Accessing the DASD failed because it is in " | |
3287 | "probeonly mode\n"); | |
1da177e4 LT |
3288 | rc = -EPERM; |
3289 | goto out; | |
3290 | } | |
3291 | ||
8e09f215 SW |
3292 | if (base->state <= DASD_STATE_BASIC) { |
3293 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
3294 | " Cannot open unrecognized device"); |
3295 | rc = -ENODEV; | |
3296 | goto out; | |
3297 | } | |
3298 | ||
33b62a30 SW |
3299 | if ((mode & FMODE_WRITE) && |
3300 | (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || | |
3301 | (base->features & DASD_FEATURE_READONLY))) { | |
3302 | rc = -EROFS; | |
3303 | goto out; | |
3304 | } | |
3305 | ||
65f8da47 | 3306 | dasd_put_device(base); |
1da177e4 LT |
3307 | return 0; |
3308 | ||
3309 | out: | |
8e09f215 | 3310 | module_put(base->discipline->owner); |
1da177e4 | 3311 | unlock: |
65f8da47 SW |
3312 | atomic_dec(&base->block->open_count); |
3313 | dasd_put_device(base); | |
1da177e4 LT |
3314 | return rc; |
3315 | } | |
3316 | ||
db2a144b | 3317 | static void dasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 3318 | { |
db2a144b AV |
3319 | struct dasd_device *base = dasd_device_from_gendisk(disk); |
3320 | if (base) { | |
3321 | atomic_dec(&base->block->open_count); | |
3322 | module_put(base->discipline->owner); | |
3323 | dasd_put_device(base); | |
3324 | } | |
1da177e4 LT |
3325 | } |
3326 | ||
a885c8c4 CH |
3327 | /* |
3328 | * Return disk geometry. | |
3329 | */ | |
8e09f215 | 3330 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 3331 | { |
8e09f215 | 3332 | struct dasd_device *base; |
a885c8c4 | 3333 | |
65f8da47 SW |
3334 | base = dasd_device_from_gendisk(bdev->bd_disk); |
3335 | if (!base) | |
a885c8c4 CH |
3336 | return -ENODEV; |
3337 | ||
8e09f215 | 3338 | if (!base->discipline || |
65f8da47 SW |
3339 | !base->discipline->fill_geometry) { |
3340 | dasd_put_device(base); | |
a885c8c4 | 3341 | return -EINVAL; |
65f8da47 SW |
3342 | } |
3343 | base->discipline->fill_geometry(base->block, geo); | |
3344 | geo->start = get_start_sect(bdev) >> base->block->s2b_shift; | |
3345 | dasd_put_device(base); | |
a885c8c4 CH |
3346 | return 0; |
3347 | } | |
3348 | ||
83d5cde4 | 3349 | const struct block_device_operations |
1da177e4 LT |
3350 | dasd_device_operations = { |
3351 | .owner = THIS_MODULE, | |
57a7c0bc AV |
3352 | .open = dasd_open, |
3353 | .release = dasd_release, | |
0000d031 HC |
3354 | .ioctl = dasd_ioctl, |
3355 | .compat_ioctl = dasd_ioctl, | |
a885c8c4 | 3356 | .getgeo = dasd_getgeo, |
1da177e4 LT |
3357 | }; |
3358 | ||
8e09f215 SW |
3359 | /******************************************************************************* |
3360 | * end of block device operations | |
3361 | */ | |
1da177e4 LT |
3362 | |
3363 | static void | |
3364 | dasd_exit(void) | |
3365 | { | |
3366 | #ifdef CONFIG_PROC_FS | |
3367 | dasd_proc_exit(); | |
3368 | #endif | |
20c64468 | 3369 | dasd_eer_exit(); |
6bb0e010 HH |
3370 | if (dasd_page_cache != NULL) { |
3371 | kmem_cache_destroy(dasd_page_cache); | |
3372 | dasd_page_cache = NULL; | |
3373 | } | |
1da177e4 LT |
3374 | dasd_gendisk_exit(); |
3375 | dasd_devmap_exit(); | |
1da177e4 LT |
3376 | if (dasd_debug_area != NULL) { |
3377 | debug_unregister(dasd_debug_area); | |
3378 | dasd_debug_area = NULL; | |
3379 | } | |
4fa52aa7 | 3380 | dasd_statistics_removeroot(); |
1da177e4 LT |
3381 | } |
3382 | ||
3383 | /* | |
3384 | * SECTION: common functions for ccw_driver use | |
3385 | */ | |
3386 | ||
33b62a30 SW |
3387 | /* |
3388 | * Is the device read-only? | |
3389 | * Note that this function does not report the setting of the | |
3390 | * readonly device attribute, but how it is configured in z/VM. | |
3391 | */ | |
3392 | int dasd_device_is_ro(struct dasd_device *device) | |
3393 | { | |
3394 | struct ccw_dev_id dev_id; | |
3395 | struct diag210 diag_data; | |
3396 | int rc; | |
3397 | ||
3398 | if (!MACHINE_IS_VM) | |
3399 | return 0; | |
3400 | ccw_device_get_id(device->cdev, &dev_id); | |
3401 | memset(&diag_data, 0, sizeof(diag_data)); | |
3402 | diag_data.vrdcdvno = dev_id.devno; | |
3403 | diag_data.vrdclen = sizeof(diag_data); | |
3404 | rc = diag210(&diag_data); | |
3405 | if (rc == 0 || rc == 2) { | |
3406 | return diag_data.vrdcvfla & 0x80; | |
3407 | } else { | |
3408 | DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", | |
3409 | dev_id.devno, rc); | |
3410 | return 0; | |
3411 | } | |
3412 | } | |
3413 | EXPORT_SYMBOL_GPL(dasd_device_is_ro); | |
3414 | ||
f3445a1a CH |
3415 | static void dasd_generic_auto_online(void *data, async_cookie_t cookie) |
3416 | { | |
3417 | struct ccw_device *cdev = data; | |
3418 | int ret; | |
3419 | ||
3420 | ret = ccw_device_set_online(cdev); | |
3421 | if (ret) | |
4ce25966 FF |
3422 | pr_warn("%s: Setting the DASD online failed with rc=%d\n", |
3423 | dev_name(&cdev->dev), ret); | |
f3445a1a CH |
3424 | } |
3425 | ||
1c01b8a5 HH |
3426 | /* |
3427 | * Initial attempt at a probe function. this can be simplified once | |
3428 | * the other detection code is gone. | |
3429 | */ | |
8e09f215 SW |
3430 | int dasd_generic_probe(struct ccw_device *cdev, |
3431 | struct dasd_discipline *discipline) | |
1da177e4 LT |
3432 | { |
3433 | int ret; | |
3434 | ||
3435 | ret = dasd_add_sysfs_files(cdev); | |
3436 | if (ret) { | |
b8ed5dd5 SH |
3437 | DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", |
3438 | "dasd_generic_probe: could not add " | |
3439 | "sysfs entries"); | |
40545573 | 3440 | return ret; |
1da177e4 | 3441 | } |
40545573 | 3442 | cdev->handler = &dasd_int_handler; |
1da177e4 | 3443 | |
40545573 HH |
3444 | /* |
3445 | * Automatically online either all dasd devices (dasd_autodetect) | |
3446 | * or all devices specified with dasd= parameters during | |
3447 | * initial probe. | |
3448 | */ | |
3449 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2a0217d5 | 3450 | (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) |
f3445a1a | 3451 | async_schedule(dasd_generic_auto_online, cdev); |
de3e0da1 | 3452 | return 0; |
1da177e4 | 3453 | } |
7048a2b5 | 3454 | EXPORT_SYMBOL_GPL(dasd_generic_probe); |
1da177e4 | 3455 | |
c020d722 SH |
3456 | void dasd_generic_free_discipline(struct dasd_device *device) |
3457 | { | |
3458 | /* Forget the discipline information. */ | |
3459 | if (device->discipline) { | |
3460 | if (device->discipline->uncheck_device) | |
3461 | device->discipline->uncheck_device(device); | |
3462 | module_put(device->discipline->owner); | |
3463 | device->discipline = NULL; | |
3464 | } | |
3465 | if (device->base_discipline) { | |
3466 | module_put(device->base_discipline->owner); | |
3467 | device->base_discipline = NULL; | |
3468 | } | |
3469 | } | |
3470 | EXPORT_SYMBOL_GPL(dasd_generic_free_discipline); | |
3471 | ||
1c01b8a5 HH |
3472 | /* |
3473 | * This will one day be called from a global not_oper handler. | |
3474 | * It is also used by driver_unregister during module unload. | |
3475 | */ | |
8e09f215 | 3476 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
3477 | { |
3478 | struct dasd_device *device; | |
8e09f215 | 3479 | struct dasd_block *block; |
1da177e4 | 3480 | |
59afda78 HH |
3481 | cdev->handler = NULL; |
3482 | ||
1da177e4 | 3483 | device = dasd_device_from_cdev(cdev); |
be4904e5 SW |
3484 | if (IS_ERR(device)) { |
3485 | dasd_remove_sysfs_files(cdev); | |
1da177e4 | 3486 | return; |
be4904e5 | 3487 | } |
d07dc5d8 SH |
3488 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) && |
3489 | !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
1da177e4 LT |
3490 | /* Already doing offline processing */ |
3491 | dasd_put_device(device); | |
be4904e5 | 3492 | dasd_remove_sysfs_files(cdev); |
1da177e4 LT |
3493 | return; |
3494 | } | |
3495 | /* | |
3496 | * This device is removed unconditionally. Set offline | |
3497 | * flag to prevent dasd_open from opening it while it is | |
3498 | * no quite down yet. | |
3499 | */ | |
3500 | dasd_set_target_state(device, DASD_STATE_NEW); | |
3501 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 | 3502 | block = device->block; |
1da177e4 | 3503 | dasd_delete_device(device); |
8e09f215 SW |
3504 | /* |
3505 | * life cycle of block is bound to device, so delete it after | |
3506 | * device was safely removed | |
3507 | */ | |
3508 | if (block) | |
3509 | dasd_free_block(block); | |
d07dc5d8 SH |
3510 | |
3511 | dasd_remove_sysfs_files(cdev); | |
1da177e4 | 3512 | } |
7048a2b5 | 3513 | EXPORT_SYMBOL_GPL(dasd_generic_remove); |
1da177e4 | 3514 | |
1c01b8a5 HH |
3515 | /* |
3516 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 3517 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
3518 | * or the user has started activation through sysfs. |
3519 | */ | |
8e09f215 SW |
3520 | int dasd_generic_set_online(struct ccw_device *cdev, |
3521 | struct dasd_discipline *base_discipline) | |
1da177e4 | 3522 | { |
aa88861f | 3523 | struct dasd_discipline *discipline; |
1da177e4 | 3524 | struct dasd_device *device; |
c6eb7b77 | 3525 | int rc; |
f24acd45 | 3526 | |
40545573 HH |
3527 | /* first online clears initial online feature flag */ |
3528 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
3529 | device = dasd_create_device(cdev); |
3530 | if (IS_ERR(device)) | |
3531 | return PTR_ERR(device); | |
3532 | ||
aa88861f | 3533 | discipline = base_discipline; |
c6eb7b77 | 3534 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 | 3535 | if (!dasd_diag_discipline_pointer) { |
7c53fcb3 PO |
3536 | /* Try to load the required module. */ |
3537 | rc = request_module(DASD_DIAG_MOD); | |
3538 | if (rc) { | |
3539 | pr_warn("%s Setting the DASD online failed " | |
3540 | "because the required module %s " | |
3541 | "could not be loaded (rc=%d)\n", | |
3542 | dev_name(&cdev->dev), DASD_DIAG_MOD, | |
3543 | rc); | |
3544 | dasd_delete_device(device); | |
3545 | return -ENODEV; | |
3546 | } | |
3547 | } | |
3548 | /* Module init could have failed, so check again here after | |
3549 | * request_module(). */ | |
3550 | if (!dasd_diag_discipline_pointer) { | |
4ce25966 FF |
3551 | pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n", |
3552 | dev_name(&cdev->dev)); | |
1da177e4 LT |
3553 | dasd_delete_device(device); |
3554 | return -ENODEV; | |
3555 | } | |
3556 | discipline = dasd_diag_discipline_pointer; | |
3557 | } | |
aa88861f PO |
3558 | if (!try_module_get(base_discipline->owner)) { |
3559 | dasd_delete_device(device); | |
3560 | return -EINVAL; | |
3561 | } | |
3562 | if (!try_module_get(discipline->owner)) { | |
3563 | module_put(base_discipline->owner); | |
3564 | dasd_delete_device(device); | |
3565 | return -EINVAL; | |
3566 | } | |
3567 | device->base_discipline = base_discipline; | |
1da177e4 LT |
3568 | device->discipline = discipline; |
3569 | ||
8e09f215 | 3570 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
3571 | rc = discipline->check_device(device); |
3572 | if (rc) { | |
4ce25966 FF |
3573 | pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n", |
3574 | dev_name(&cdev->dev), discipline->name, rc); | |
aa88861f PO |
3575 | module_put(discipline->owner); |
3576 | module_put(base_discipline->owner); | |
1da177e4 LT |
3577 | dasd_delete_device(device); |
3578 | return rc; | |
3579 | } | |
3580 | ||
3581 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
3582 | if (device->state <= DASD_STATE_KNOWN) { | |
4ce25966 FF |
3583 | pr_warn("%s Setting the DASD online failed because of a missing discipline\n", |
3584 | dev_name(&cdev->dev)); | |
1da177e4 LT |
3585 | rc = -ENODEV; |
3586 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
3587 | if (device->block) |
3588 | dasd_free_block(device->block); | |
1da177e4 LT |
3589 | dasd_delete_device(device); |
3590 | } else | |
3591 | pr_debug("dasd_generic device %s found\n", | |
2a0217d5 | 3592 | dev_name(&cdev->dev)); |
589c74d5 SH |
3593 | |
3594 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
3595 | ||
1da177e4 | 3596 | dasd_put_device(device); |
1da177e4 LT |
3597 | return rc; |
3598 | } | |
7048a2b5 | 3599 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); |
1da177e4 | 3600 | |
8e09f215 | 3601 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
3602 | { |
3603 | struct dasd_device *device; | |
8e09f215 | 3604 | struct dasd_block *block; |
d07dc5d8 | 3605 | int max_count, open_count, rc; |
0f57c97f | 3606 | unsigned long flags; |
1da177e4 | 3607 | |
d07dc5d8 | 3608 | rc = 0; |
0f57c97f JH |
3609 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
3610 | device = dasd_device_from_cdev_locked(cdev); | |
3611 | if (IS_ERR(device)) { | |
3612 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1da177e4 | 3613 | return PTR_ERR(device); |
0f57c97f | 3614 | } |
d07dc5d8 | 3615 | |
1da177e4 LT |
3616 | /* |
3617 | * We must make sure that this device is currently not in use. | |
3618 | * The open_count is increased for every opener, that includes | |
3619 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
3620 | * in the other openers. | |
3621 | */ | |
8e09f215 | 3622 | if (device->block) { |
a806170e HC |
3623 | max_count = device->block->bdev ? 0 : -1; |
3624 | open_count = atomic_read(&device->block->open_count); | |
8e09f215 SW |
3625 | if (open_count > max_count) { |
3626 | if (open_count > 0) | |
4ce25966 FF |
3627 | pr_warn("%s: The DASD cannot be set offline with open count %i\n", |
3628 | dev_name(&cdev->dev), open_count); | |
8e09f215 | 3629 | else |
4ce25966 FF |
3630 | pr_warn("%s: The DASD cannot be set offline while it is in use\n", |
3631 | dev_name(&cdev->dev)); | |
2757fe1d SH |
3632 | rc = -EBUSY; |
3633 | goto out_err; | |
8e09f215 | 3634 | } |
1da177e4 | 3635 | } |
d07dc5d8 | 3636 | |
2757fe1d SH |
3637 | /* |
3638 | * Test if the offline processing is already running and exit if so. | |
3639 | * If a safe offline is being processed this could only be a normal | |
3640 | * offline that should be able to overtake the safe offline and | |
3641 | * cancel any I/O we do not want to wait for any longer | |
3642 | */ | |
3643 | if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
3644 | if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
3645 | clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, | |
3646 | &device->flags); | |
3647 | } else { | |
3648 | rc = -EBUSY; | |
3649 | goto out_err; | |
3650 | } | |
0f57c97f | 3651 | } |
0f57c97f | 3652 | set_bit(DASD_FLAG_OFFLINE, &device->flags); |
d07dc5d8 SH |
3653 | |
3654 | /* | |
2757fe1d | 3655 | * if safe_offline is called set safe_offline_running flag and |
d07dc5d8 SH |
3656 | * clear safe_offline so that a call to normal offline |
3657 | * can overrun safe_offline processing | |
3658 | */ | |
3659 | if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) && | |
3660 | !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
2757fe1d SH |
3661 | /* need to unlock here to wait for outstanding I/O */ |
3662 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
d07dc5d8 SH |
3663 | /* |
3664 | * If we want to set the device safe offline all IO operations | |
3665 | * should be finished before continuing the offline process | |
3666 | * so sync bdev first and then wait for our queues to become | |
3667 | * empty | |
3668 | */ | |
ca732e11 SH |
3669 | if (device->block) { |
3670 | rc = fsync_bdev(device->block->bdev); | |
3671 | if (rc != 0) | |
3672 | goto interrupted; | |
3673 | } | |
d07dc5d8 SH |
3674 | dasd_schedule_device_bh(device); |
3675 | rc = wait_event_interruptible(shutdown_waitq, | |
3676 | _wait_for_empty_queues(device)); | |
3677 | if (rc != 0) | |
3678 | goto interrupted; | |
2757fe1d SH |
3679 | |
3680 | /* | |
3681 | * check if a normal offline process overtook the offline | |
3682 | * processing in this case simply do nothing beside returning | |
3683 | * that we got interrupted | |
3684 | * otherwise mark safe offline as not running any longer and | |
3685 | * continue with normal offline | |
3686 | */ | |
3687 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
3688 | if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { | |
3689 | rc = -ERESTARTSYS; | |
3690 | goto out_err; | |
3691 | } | |
3692 | clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); | |
d07dc5d8 | 3693 | } |
2757fe1d | 3694 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
d07dc5d8 | 3695 | |
1da177e4 LT |
3696 | dasd_set_target_state(device, DASD_STATE_NEW); |
3697 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 | 3698 | block = device->block; |
1da177e4 | 3699 | dasd_delete_device(device); |
8e09f215 SW |
3700 | /* |
3701 | * life cycle of block is bound to device, so delete it after | |
3702 | * device was safely removed | |
3703 | */ | |
3704 | if (block) | |
3705 | dasd_free_block(block); | |
2757fe1d | 3706 | |
1da177e4 | 3707 | return 0; |
d07dc5d8 SH |
3708 | |
3709 | interrupted: | |
3710 | /* interrupted by signal */ | |
2757fe1d | 3711 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
d07dc5d8 SH |
3712 | clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); |
3713 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); | |
2757fe1d | 3714 | out_err: |
0f57c97f JH |
3715 | dasd_put_device(device); |
3716 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
2757fe1d | 3717 | return rc; |
1da177e4 | 3718 | } |
7048a2b5 | 3719 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); |
1da177e4 | 3720 | |
a4d26c6a SW |
3721 | int dasd_generic_last_path_gone(struct dasd_device *device) |
3722 | { | |
3723 | struct dasd_ccw_req *cqr; | |
3724 | ||
3725 | dev_warn(&device->cdev->dev, "No operational channel path is left " | |
3726 | "for the device\n"); | |
3727 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); | |
3728 | /* First of all call extended error reporting. */ | |
3729 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
3730 | ||
3731 | if (device->state < DASD_STATE_BASIC) | |
3732 | return 0; | |
3733 | /* Device is active. We want to keep it. */ | |
3734 | list_for_each_entry(cqr, &device->ccw_queue, devlist) | |
3735 | if ((cqr->status == DASD_CQR_IN_IO) || | |
3736 | (cqr->status == DASD_CQR_CLEAR_PENDING)) { | |
3737 | cqr->status = DASD_CQR_QUEUED; | |
3738 | cqr->retries++; | |
3739 | } | |
3740 | dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); | |
3741 | dasd_device_clear_timer(device); | |
3742 | dasd_schedule_device_bh(device); | |
3743 | return 1; | |
3744 | } | |
3745 | EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); | |
3746 | ||
3747 | int dasd_generic_path_operational(struct dasd_device *device) | |
3748 | { | |
3749 | dev_info(&device->cdev->dev, "A channel path to the device has become " | |
3750 | "operational\n"); | |
3751 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); | |
3752 | dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); | |
3753 | if (device->stopped & DASD_UNRESUMED_PM) { | |
3754 | dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); | |
3755 | dasd_restore_device(device); | |
3756 | return 1; | |
3757 | } | |
3758 | dasd_schedule_device_bh(device); | |
e443343e | 3759 | if (device->block) { |
a4d26c6a | 3760 | dasd_schedule_block_bh(device->block); |
673514af SH |
3761 | if (device->block->request_queue) |
3762 | blk_mq_run_hw_queues(device->block->request_queue, | |
3763 | true); | |
e443343e | 3764 | } |
931a3dce SH |
3765 | |
3766 | if (!device->stopped) | |
3767 | wake_up(&generic_waitq); | |
3768 | ||
a4d26c6a SW |
3769 | return 1; |
3770 | } | |
3771 | EXPORT_SYMBOL_GPL(dasd_generic_path_operational); | |
3772 | ||
8e09f215 | 3773 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
3774 | { |
3775 | struct dasd_device *device; | |
1da177e4 LT |
3776 | int ret; |
3777 | ||
91c36919 | 3778 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 LT |
3779 | if (IS_ERR(device)) |
3780 | return 0; | |
1da177e4 LT |
3781 | ret = 0; |
3782 | switch (event) { | |
3783 | case CIO_GONE: | |
47593bfa | 3784 | case CIO_BOXED: |
1da177e4 | 3785 | case CIO_NO_PATH: |
c9346151 | 3786 | dasd_path_no_path(device); |
a4d26c6a | 3787 | ret = dasd_generic_last_path_gone(device); |
1da177e4 LT |
3788 | break; |
3789 | case CIO_OPER: | |
1da177e4 | 3790 | ret = 1; |
c9346151 | 3791 | if (dasd_path_get_opm(device)) |
a4d26c6a | 3792 | ret = dasd_generic_path_operational(device); |
1da177e4 LT |
3793 | break; |
3794 | } | |
1da177e4 LT |
3795 | dasd_put_device(device); |
3796 | return ret; | |
3797 | } | |
7048a2b5 | 3798 | EXPORT_SYMBOL_GPL(dasd_generic_notify); |
1da177e4 | 3799 | |
a4d26c6a SW |
3800 | void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) |
3801 | { | |
a4d26c6a | 3802 | struct dasd_device *device; |
a521b048 | 3803 | int chp, oldopm, hpfpm, ifccpm; |
a4d26c6a SW |
3804 | |
3805 | device = dasd_device_from_cdev_locked(cdev); | |
3806 | if (IS_ERR(device)) | |
3807 | return; | |
c9346151 SH |
3808 | |
3809 | oldopm = dasd_path_get_opm(device); | |
a4d26c6a | 3810 | for (chp = 0; chp < 8; chp++) { |
a4d26c6a | 3811 | if (path_event[chp] & PE_PATH_GONE) { |
c9346151 | 3812 | dasd_path_notoper(device, chp); |
a4d26c6a SW |
3813 | } |
3814 | if (path_event[chp] & PE_PATH_AVAILABLE) { | |
c9346151 | 3815 | dasd_path_available(device, chp); |
a4d26c6a SW |
3816 | dasd_schedule_device_bh(device); |
3817 | } | |
f1633031 | 3818 | if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { |
c9346151 SH |
3819 | if (!dasd_path_is_operational(device, chp) && |
3820 | !dasd_path_need_verify(device, chp)) { | |
12d7b107 SH |
3821 | /* |
3822 | * we can not establish a pathgroup on an | |
3823 | * unavailable path, so trigger a path | |
3824 | * verification first | |
3825 | */ | |
c9346151 SH |
3826 | dasd_path_available(device, chp); |
3827 | dasd_schedule_device_bh(device); | |
12d7b107 | 3828 | } |
f1633031 SH |
3829 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
3830 | "Pathgroup re-established\n"); | |
3831 | if (device->discipline->kick_validate) | |
3832 | device->discipline->kick_validate(device); | |
3833 | } | |
a4d26c6a | 3834 | } |
a521b048 SH |
3835 | hpfpm = dasd_path_get_hpfpm(device); |
3836 | ifccpm = dasd_path_get_ifccpm(device); | |
3837 | if (!dasd_path_get_opm(device) && hpfpm) { | |
3838 | /* | |
3839 | * device has no operational paths but at least one path is | |
3840 | * disabled due to HPF errors | |
3841 | * disable HPF at all and use the path(s) again | |
3842 | */ | |
3843 | if (device->discipline->disable_hpf) | |
3844 | device->discipline->disable_hpf(device); | |
3845 | dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC); | |
3846 | dasd_path_set_tbvpm(device, hpfpm); | |
3847 | dasd_schedule_device_bh(device); | |
3848 | dasd_schedule_requeue(device); | |
3849 | } else if (!dasd_path_get_opm(device) && ifccpm) { | |
3850 | /* | |
3851 | * device has no operational paths but at least one path is | |
3852 | * disabled due to IFCC errors | |
3853 | * trigger path verification on paths with IFCC errors | |
3854 | */ | |
3855 | dasd_path_set_tbvpm(device, ifccpm); | |
3856 | dasd_schedule_device_bh(device); | |
3857 | } | |
3858 | if (oldopm && !dasd_path_get_opm(device) && !hpfpm && !ifccpm) { | |
c9346151 SH |
3859 | dev_warn(&device->cdev->dev, |
3860 | "No verified channel paths remain for the device\n"); | |
3861 | DBF_DEV_EVENT(DBF_WARNING, device, | |
3862 | "%s", "last verified path gone"); | |
3863 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
3864 | dasd_device_set_stop_bits(device, | |
3865 | DASD_STOPPED_DC_WAIT); | |
3866 | } | |
a4d26c6a SW |
3867 | dasd_put_device(device); |
3868 | } | |
3869 | EXPORT_SYMBOL_GPL(dasd_generic_path_event); | |
3870 | ||
3871 | int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) | |
3872 | { | |
c9346151 SH |
3873 | if (!dasd_path_get_opm(device) && lpm) { |
3874 | dasd_path_set_opm(device, lpm); | |
a4d26c6a SW |
3875 | dasd_generic_path_operational(device); |
3876 | } else | |
c9346151 | 3877 | dasd_path_add_opm(device, lpm); |
a4d26c6a SW |
3878 | return 0; |
3879 | } | |
3880 | EXPORT_SYMBOL_GPL(dasd_generic_verify_path); | |
3881 | ||
a521b048 SH |
3882 | /* |
3883 | * clear active requests and requeue them to block layer if possible | |
3884 | */ | |
3885 | static int dasd_generic_requeue_all_requests(struct dasd_device *device) | |
d41dd122 | 3886 | { |
a521b048 | 3887 | struct list_head requeue_queue; |
d41dd122 | 3888 | struct dasd_ccw_req *cqr, *n; |
c5576876 | 3889 | struct dasd_ccw_req *refers; |
d41dd122 | 3890 | int rc; |
d41dd122 | 3891 | |
a521b048 SH |
3892 | INIT_LIST_HEAD(&requeue_queue); |
3893 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
d41dd122 SH |
3894 | rc = 0; |
3895 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { | |
3896 | /* Check status and move request to flush_queue */ | |
3897 | if (cqr->status == DASD_CQR_IN_IO) { | |
3898 | rc = device->discipline->term_IO(cqr); | |
3899 | if (rc) { | |
3900 | /* unable to terminate requeust */ | |
3901 | dev_err(&device->cdev->dev, | |
3902 | "Unable to terminate request %p " | |
3903 | "on suspend\n", cqr); | |
a521b048 | 3904 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
d41dd122 SH |
3905 | dasd_put_device(device); |
3906 | return rc; | |
3907 | } | |
3908 | } | |
a521b048 | 3909 | list_move_tail(&cqr->devlist, &requeue_queue); |
d41dd122 | 3910 | } |
a521b048 | 3911 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
d41dd122 | 3912 | |
a521b048 | 3913 | list_for_each_entry_safe(cqr, n, &requeue_queue, devlist) { |
d41dd122 SH |
3914 | wait_event(dasd_flush_wq, |
3915 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
c5576876 | 3916 | |
a521b048 SH |
3917 | /* mark sleepon requests as ended */ |
3918 | if (cqr->callback_data == DASD_SLEEPON_START_TAG) | |
3919 | cqr->callback_data = DASD_SLEEPON_END_TAG; | |
c5576876 SH |
3920 | |
3921 | /* remove requests from device and block queue */ | |
3922 | list_del_init(&cqr->devlist); | |
3923 | while (cqr->refers != NULL) { | |
3924 | refers = cqr->refers; | |
3925 | /* remove the request from the block queue */ | |
3926 | list_del(&cqr->blocklist); | |
3927 | /* free the finished erp request */ | |
3928 | dasd_free_erp_request(cqr, cqr->memdev); | |
3929 | cqr = refers; | |
3930 | } | |
a521b048 SH |
3931 | |
3932 | /* | |
3933 | * requeue requests to blocklayer will only work | |
3934 | * for block device requests | |
3935 | */ | |
3936 | if (_dasd_requeue_request(cqr)) | |
3937 | continue; | |
3938 | ||
c5576876 SH |
3939 | if (cqr->block) |
3940 | list_del_init(&cqr->blocklist); | |
3941 | cqr->block->base->discipline->free_cp( | |
3942 | cqr, (struct request *) cqr->callback_data); | |
d41dd122 | 3943 | } |
d41dd122 | 3944 | |
c5576876 SH |
3945 | /* |
3946 | * if requests remain then they are internal request | |
3947 | * and go back to the device queue | |
3948 | */ | |
a521b048 | 3949 | if (!list_empty(&requeue_queue)) { |
c5576876 | 3950 | /* move freeze_queue to start of the ccw_queue */ |
a521b048 SH |
3951 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
3952 | list_splice_tail(&requeue_queue, &device->ccw_queue); | |
3953 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
c5576876 | 3954 | } |
a521b048 SH |
3955 | /* wake up generic waitqueue for eventually ended sleepon requests */ |
3956 | wake_up(&generic_waitq); | |
d41dd122 SH |
3957 | return rc; |
3958 | } | |
a521b048 SH |
3959 | |
3960 | static void do_requeue_requests(struct work_struct *work) | |
3961 | { | |
3962 | struct dasd_device *device = container_of(work, struct dasd_device, | |
3963 | requeue_requests); | |
3964 | dasd_generic_requeue_all_requests(device); | |
3965 | dasd_device_remove_stop_bits(device, DASD_STOPPED_NOT_ACC); | |
3966 | if (device->block) | |
3967 | dasd_schedule_block_bh(device->block); | |
3968 | dasd_put_device(device); | |
3969 | } | |
3970 | ||
3971 | void dasd_schedule_requeue(struct dasd_device *device) | |
3972 | { | |
3973 | dasd_get_device(device); | |
3974 | /* queue call to dasd_reload_device to the kernel event daemon. */ | |
3975 | if (!schedule_work(&device->requeue_requests)) | |
3976 | dasd_put_device(device); | |
3977 | } | |
3978 | EXPORT_SYMBOL(dasd_schedule_requeue); | |
3979 | ||
3980 | int dasd_generic_pm_freeze(struct ccw_device *cdev) | |
3981 | { | |
3982 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
a521b048 SH |
3983 | |
3984 | if (IS_ERR(device)) | |
3985 | return PTR_ERR(device); | |
3986 | ||
3987 | /* mark device as suspended */ | |
3988 | set_bit(DASD_FLAG_SUSPENDED, &device->flags); | |
3989 | ||
3990 | if (device->discipline->freeze) | |
4bca698f | 3991 | device->discipline->freeze(device); |
a521b048 SH |
3992 | |
3993 | /* disallow new I/O */ | |
3994 | dasd_device_set_stop_bits(device, DASD_STOPPED_PM); | |
3995 | ||
3996 | return dasd_generic_requeue_all_requests(device); | |
3997 | } | |
d41dd122 SH |
3998 | EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); |
3999 | ||
4000 | int dasd_generic_restore_device(struct ccw_device *cdev) | |
4001 | { | |
4002 | struct dasd_device *device = dasd_device_from_cdev(cdev); | |
4003 | int rc = 0; | |
4004 | ||
4005 | if (IS_ERR(device)) | |
4006 | return PTR_ERR(device); | |
4007 | ||
e6125fba | 4008 | /* allow new IO again */ |
eb6e199b SW |
4009 | dasd_device_remove_stop_bits(device, |
4010 | (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); | |
e6125fba | 4011 | |
d41dd122 | 4012 | dasd_schedule_device_bh(device); |
d41dd122 | 4013 | |
eb6e199b SW |
4014 | /* |
4015 | * call discipline restore function | |
4016 | * if device is stopped do nothing e.g. for disconnected devices | |
4017 | */ | |
4018 | if (device->discipline->restore && !(device->stopped)) | |
d41dd122 | 4019 | rc = device->discipline->restore(device); |
eb6e199b | 4020 | if (rc || device->stopped) |
e6125fba SH |
4021 | /* |
4022 | * if the resume failed for the DASD we put it in | |
4023 | * an UNRESUMED stop state | |
4024 | */ | |
4025 | device->stopped |= DASD_UNRESUMED_PM; | |
d41dd122 | 4026 | |
e443343e | 4027 | if (device->block) { |
6fca97a9 | 4028 | dasd_schedule_block_bh(device->block); |
673514af SH |
4029 | if (device->block->request_queue) |
4030 | blk_mq_run_hw_queues(device->block->request_queue, | |
4031 | true); | |
e443343e | 4032 | } |
6fca97a9 | 4033 | |
c8d1c0ff | 4034 | clear_bit(DASD_FLAG_SUSPENDED, &device->flags); |
d41dd122 | 4035 | dasd_put_device(device); |
e6125fba | 4036 | return 0; |
d41dd122 SH |
4037 | } |
4038 | EXPORT_SYMBOL_GPL(dasd_generic_restore_device); | |
4039 | ||
763968e2 HC |
4040 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
4041 | void *rdc_buffer, | |
4042 | int rdc_buffer_size, | |
68b781fe | 4043 | int magic) |
17283b56 CH |
4044 | { |
4045 | struct dasd_ccw_req *cqr; | |
4046 | struct ccw1 *ccw; | |
d9fa9441 | 4047 | unsigned long *idaw; |
17283b56 CH |
4048 | |
4049 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
4050 | ||
4051 | if (IS_ERR(cqr)) { | |
fc19f381 SH |
4052 | /* internal error 13 - Allocating the RDC request failed*/ |
4053 | dev_err(&device->cdev->dev, | |
4054 | "An error occurred in the DASD device driver, " | |
4055 | "reason=%s\n", "13"); | |
17283b56 CH |
4056 | return cqr; |
4057 | } | |
4058 | ||
4059 | ccw = cqr->cpaddr; | |
4060 | ccw->cmd_code = CCW_CMD_RDC; | |
d9fa9441 SH |
4061 | if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { |
4062 | idaw = (unsigned long *) (cqr->data); | |
4063 | ccw->cda = (__u32)(addr_t) idaw; | |
4064 | ccw->flags = CCW_FLAG_IDA; | |
4065 | idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); | |
4066 | } else { | |
4067 | ccw->cda = (__u32)(addr_t) rdc_buffer; | |
4068 | ccw->flags = 0; | |
4069 | } | |
17283b56 | 4070 | |
d9fa9441 | 4071 | ccw->count = rdc_buffer_size; |
8e09f215 SW |
4072 | cqr->startdev = device; |
4073 | cqr->memdev = device; | |
17283b56 | 4074 | cqr->expires = 10*HZ; |
eb6e199b | 4075 | cqr->retries = 256; |
1aae0560 | 4076 | cqr->buildclk = get_tod_clock(); |
17283b56 CH |
4077 | cqr->status = DASD_CQR_FILLED; |
4078 | return cqr; | |
4079 | } | |
4080 | ||
4081 | ||
68b781fe | 4082 | int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, |
92636b15 | 4083 | void *rdc_buffer, int rdc_buffer_size) |
17283b56 CH |
4084 | { |
4085 | int ret; | |
4086 | struct dasd_ccw_req *cqr; | |
4087 | ||
92636b15 | 4088 | cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, |
17283b56 CH |
4089 | magic); |
4090 | if (IS_ERR(cqr)) | |
4091 | return PTR_ERR(cqr); | |
4092 | ||
4093 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 4094 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
4095 | return ret; |
4096 | } | |
aaff0f64 | 4097 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 4098 | |
f3eb5384 SW |
4099 | /* |
4100 | * In command mode and transport mode we need to look for sense | |
4101 | * data in different places. The sense data itself is allways | |
4102 | * an array of 32 bytes, so we can unify the sense data access | |
4103 | * for both modes. | |
4104 | */ | |
4105 | char *dasd_get_sense(struct irb *irb) | |
4106 | { | |
4107 | struct tsb *tsb = NULL; | |
4108 | char *sense = NULL; | |
4109 | ||
4110 | if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { | |
4111 | if (irb->scsw.tm.tcw) | |
4112 | tsb = tcw_get_tsb((struct tcw *)(unsigned long) | |
4113 | irb->scsw.tm.tcw); | |
4114 | if (tsb && tsb->length == 64 && tsb->flags) | |
4115 | switch (tsb->flags & 0x07) { | |
4116 | case 1: /* tsa_iostat */ | |
4117 | sense = tsb->tsa.iostat.sense; | |
4118 | break; | |
4119 | case 2: /* tsa_ddpc */ | |
4120 | sense = tsb->tsa.ddpc.sense; | |
4121 | break; | |
4122 | default: | |
4123 | /* currently we don't use interrogate data */ | |
4124 | break; | |
4125 | } | |
4126 | } else if (irb->esw.esw0.erw.cons) { | |
4127 | sense = irb->ecw; | |
4128 | } | |
4129 | return sense; | |
4130 | } | |
4131 | EXPORT_SYMBOL_GPL(dasd_get_sense); | |
4132 | ||
4679e893 SH |
4133 | void dasd_generic_shutdown(struct ccw_device *cdev) |
4134 | { | |
4135 | struct dasd_device *device; | |
4136 | ||
4137 | device = dasd_device_from_cdev(cdev); | |
4138 | if (IS_ERR(device)) | |
4139 | return; | |
4140 | ||
4141 | if (device->block) | |
4142 | dasd_schedule_block_bh(device->block); | |
4143 | ||
4144 | dasd_schedule_device_bh(device); | |
4145 | ||
4146 | wait_event(shutdown_waitq, _wait_for_empty_queues(device)); | |
4147 | } | |
4148 | EXPORT_SYMBOL_GPL(dasd_generic_shutdown); | |
4149 | ||
8e09f215 | 4150 | static int __init dasd_init(void) |
1da177e4 LT |
4151 | { |
4152 | int rc; | |
4153 | ||
4154 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 4155 | init_waitqueue_head(&dasd_flush_wq); |
c80ee724 | 4156 | init_waitqueue_head(&generic_waitq); |
4679e893 | 4157 | init_waitqueue_head(&shutdown_waitq); |
1da177e4 LT |
4158 | |
4159 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 4160 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
4161 | if (dasd_debug_area == NULL) { |
4162 | rc = -ENOMEM; | |
4163 | goto failed; | |
4164 | } | |
4165 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 4166 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
4167 | |
4168 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
4169 | ||
4170 | dasd_diag_discipline_pointer = NULL; | |
4171 | ||
4fa52aa7 SW |
4172 | dasd_statistics_createroot(); |
4173 | ||
1da177e4 LT |
4174 | rc = dasd_devmap_init(); |
4175 | if (rc) | |
4176 | goto failed; | |
4177 | rc = dasd_gendisk_init(); | |
4178 | if (rc) | |
4179 | goto failed; | |
4180 | rc = dasd_parse(); | |
4181 | if (rc) | |
4182 | goto failed; | |
20c64468 SW |
4183 | rc = dasd_eer_init(); |
4184 | if (rc) | |
4185 | goto failed; | |
1da177e4 LT |
4186 | #ifdef CONFIG_PROC_FS |
4187 | rc = dasd_proc_init(); | |
4188 | if (rc) | |
4189 | goto failed; | |
4190 | #endif | |
4191 | ||
4192 | return 0; | |
4193 | failed: | |
fc19f381 | 4194 | pr_info("The DASD device driver could not be initialized\n"); |
1da177e4 LT |
4195 | dasd_exit(); |
4196 | return rc; | |
4197 | } | |
4198 | ||
4199 | module_init(dasd_init); | |
4200 | module_exit(dasd_exit); |