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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 LT |
12 | #include <linux/kmod.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/ctype.h> | |
16 | #include <linux/major.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/buffer_head.h> | |
a885c8c4 | 19 | #include <linux/hdreg.h> |
1da177e4 LT |
20 | |
21 | #include <asm/ccwdev.h> | |
22 | #include <asm/ebcdic.h> | |
23 | #include <asm/idals.h> | |
24 | #include <asm/todclk.h> | |
25 | ||
26 | /* This is ugly... */ | |
27 | #define PRINTK_HEADER "dasd:" | |
28 | ||
29 | #include "dasd_int.h" | |
30 | /* | |
31 | * SECTION: Constant definitions to be used within this file | |
32 | */ | |
33 | #define DASD_CHANQ_MAX_SIZE 4 | |
34 | ||
35 | /* | |
36 | * SECTION: exported variables of dasd.c | |
37 | */ | |
38 | debug_info_t *dasd_debug_area; | |
39 | struct dasd_discipline *dasd_diag_discipline_pointer; | |
2b67fc46 | 40 | void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); |
1da177e4 LT |
41 | |
42 | MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); | |
43 | MODULE_DESCRIPTION("Linux on S/390 DASD device driver," | |
44 | " Copyright 2000 IBM Corporation"); | |
45 | MODULE_SUPPORTED_DEVICE("dasd"); | |
1da177e4 LT |
46 | MODULE_LICENSE("GPL"); |
47 | ||
48 | /* | |
49 | * SECTION: prototypes for static functions of dasd.c | |
50 | */ | |
8e09f215 SW |
51 | static int dasd_alloc_queue(struct dasd_block *); |
52 | static void dasd_setup_queue(struct dasd_block *); | |
53 | static void dasd_free_queue(struct dasd_block *); | |
54 | static void dasd_flush_request_queue(struct dasd_block *); | |
55 | static int dasd_flush_block_queue(struct dasd_block *); | |
56 | static void dasd_device_tasklet(struct dasd_device *); | |
57 | static void dasd_block_tasklet(struct dasd_block *); | |
4927b3f7 | 58 | static void do_kick_device(struct work_struct *); |
8e09f215 | 59 | static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); |
1da177e4 LT |
60 | |
61 | /* | |
62 | * SECTION: Operations on the device structure. | |
63 | */ | |
64 | static wait_queue_head_t dasd_init_waitq; | |
8f61701b | 65 | static wait_queue_head_t dasd_flush_wq; |
1da177e4 LT |
66 | |
67 | /* | |
68 | * Allocate memory for a new device structure. | |
69 | */ | |
8e09f215 | 70 | struct dasd_device *dasd_alloc_device(void) |
1da177e4 LT |
71 | { |
72 | struct dasd_device *device; | |
73 | ||
8e09f215 SW |
74 | device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); |
75 | if (!device) | |
1da177e4 | 76 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
77 | |
78 | /* Get two pages for normal block device operations. */ | |
79 | device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); | |
8e09f215 | 80 | if (!device->ccw_mem) { |
1da177e4 LT |
81 | kfree(device); |
82 | return ERR_PTR(-ENOMEM); | |
83 | } | |
84 | /* Get one page for error recovery. */ | |
85 | device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); | |
8e09f215 | 86 | if (!device->erp_mem) { |
1da177e4 LT |
87 | free_pages((unsigned long) device->ccw_mem, 1); |
88 | kfree(device); | |
89 | return ERR_PTR(-ENOMEM); | |
90 | } | |
91 | ||
92 | dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); | |
93 | dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); | |
94 | spin_lock_init(&device->mem_lock); | |
8e09f215 | 95 | atomic_set(&device->tasklet_scheduled, 0); |
138c014d | 96 | tasklet_init(&device->tasklet, |
8e09f215 | 97 | (void (*)(unsigned long)) dasd_device_tasklet, |
1da177e4 LT |
98 | (unsigned long) device); |
99 | INIT_LIST_HEAD(&device->ccw_queue); | |
100 | init_timer(&device->timer); | |
4927b3f7 | 101 | INIT_WORK(&device->kick_work, do_kick_device); |
1da177e4 LT |
102 | device->state = DASD_STATE_NEW; |
103 | device->target = DASD_STATE_NEW; | |
104 | ||
105 | return device; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Free memory of a device structure. | |
110 | */ | |
8e09f215 | 111 | void dasd_free_device(struct dasd_device *device) |
1da177e4 | 112 | { |
17fd682e | 113 | kfree(device->private); |
1da177e4 LT |
114 | free_page((unsigned long) device->erp_mem); |
115 | free_pages((unsigned long) device->ccw_mem, 1); | |
116 | kfree(device); | |
117 | } | |
118 | ||
8e09f215 SW |
119 | /* |
120 | * Allocate memory for a new device structure. | |
121 | */ | |
122 | struct dasd_block *dasd_alloc_block(void) | |
123 | { | |
124 | struct dasd_block *block; | |
125 | ||
126 | block = kzalloc(sizeof(*block), GFP_ATOMIC); | |
127 | if (!block) | |
128 | return ERR_PTR(-ENOMEM); | |
129 | /* open_count = 0 means device online but not in use */ | |
130 | atomic_set(&block->open_count, -1); | |
131 | ||
132 | spin_lock_init(&block->request_queue_lock); | |
133 | atomic_set(&block->tasklet_scheduled, 0); | |
134 | tasklet_init(&block->tasklet, | |
135 | (void (*)(unsigned long)) dasd_block_tasklet, | |
136 | (unsigned long) block); | |
137 | INIT_LIST_HEAD(&block->ccw_queue); | |
138 | spin_lock_init(&block->queue_lock); | |
139 | init_timer(&block->timer); | |
140 | ||
141 | return block; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Free memory of a device structure. | |
146 | */ | |
147 | void dasd_free_block(struct dasd_block *block) | |
148 | { | |
149 | kfree(block); | |
150 | } | |
151 | ||
1da177e4 LT |
152 | /* |
153 | * Make a new device known to the system. | |
154 | */ | |
8e09f215 | 155 | static int dasd_state_new_to_known(struct dasd_device *device) |
1da177e4 LT |
156 | { |
157 | int rc; | |
158 | ||
159 | /* | |
138c014d | 160 | * As long as the device is not in state DASD_STATE_NEW we want to |
1da177e4 LT |
161 | * keep the reference count > 0. |
162 | */ | |
163 | dasd_get_device(device); | |
164 | ||
8e09f215 SW |
165 | if (device->block) { |
166 | rc = dasd_alloc_queue(device->block); | |
167 | if (rc) { | |
168 | dasd_put_device(device); | |
169 | return rc; | |
170 | } | |
1da177e4 | 171 | } |
1da177e4 LT |
172 | device->state = DASD_STATE_KNOWN; |
173 | return 0; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Let the system forget about a device. | |
178 | */ | |
8e09f215 | 179 | static int dasd_state_known_to_new(struct dasd_device *device) |
1da177e4 | 180 | { |
20c64468 SW |
181 | /* Disable extended error reporting for this device. */ |
182 | dasd_eer_disable(device); | |
1da177e4 | 183 | /* Forget the discipline information. */ |
8e09f215 SW |
184 | if (device->discipline) { |
185 | if (device->discipline->uncheck_device) | |
186 | device->discipline->uncheck_device(device); | |
aa88861f | 187 | module_put(device->discipline->owner); |
8e09f215 | 188 | } |
1da177e4 | 189 | device->discipline = NULL; |
aa88861f PO |
190 | if (device->base_discipline) |
191 | module_put(device->base_discipline->owner); | |
192 | device->base_discipline = NULL; | |
1da177e4 LT |
193 | device->state = DASD_STATE_NEW; |
194 | ||
8e09f215 SW |
195 | if (device->block) |
196 | dasd_free_queue(device->block); | |
1da177e4 LT |
197 | |
198 | /* Give up reference we took in dasd_state_new_to_known. */ | |
199 | dasd_put_device(device); | |
8f61701b | 200 | return 0; |
1da177e4 LT |
201 | } |
202 | ||
203 | /* | |
204 | * Request the irq line for the device. | |
205 | */ | |
8e09f215 | 206 | static int dasd_state_known_to_basic(struct dasd_device *device) |
1da177e4 LT |
207 | { |
208 | int rc; | |
209 | ||
210 | /* Allocate and register gendisk structure. */ | |
8e09f215 SW |
211 | if (device->block) { |
212 | rc = dasd_gendisk_alloc(device->block); | |
213 | if (rc) | |
214 | return rc; | |
215 | } | |
1da177e4 | 216 | /* register 'device' debug area, used for all DBF_DEV_XXX calls */ |
361f494d | 217 | device->debug_area = debug_register(device->cdev->dev.bus_id, 1, 1, |
8e09f215 | 218 | 8 * sizeof(long)); |
1da177e4 | 219 | debug_register_view(device->debug_area, &debug_sprintf_view); |
b0035f12 | 220 | debug_set_level(device->debug_area, DBF_WARNING); |
1da177e4 LT |
221 | DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); |
222 | ||
223 | device->state = DASD_STATE_BASIC; | |
224 | return 0; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Release the irq line for the device. Terminate any running i/o. | |
229 | */ | |
8e09f215 | 230 | static int dasd_state_basic_to_known(struct dasd_device *device) |
1da177e4 | 231 | { |
8f61701b | 232 | int rc; |
8e09f215 SW |
233 | if (device->block) { |
234 | dasd_gendisk_free(device->block); | |
235 | dasd_block_clear_timer(device->block); | |
236 | } | |
237 | rc = dasd_flush_device_queue(device); | |
8f61701b HH |
238 | if (rc) |
239 | return rc; | |
8e09f215 | 240 | dasd_device_clear_timer(device); |
8f61701b | 241 | |
1da177e4 LT |
242 | DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); |
243 | if (device->debug_area != NULL) { | |
244 | debug_unregister(device->debug_area); | |
245 | device->debug_area = NULL; | |
246 | } | |
247 | device->state = DASD_STATE_KNOWN; | |
8f61701b | 248 | return 0; |
1da177e4 LT |
249 | } |
250 | ||
251 | /* | |
252 | * Do the initial analysis. The do_analysis function may return | |
253 | * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC | |
254 | * until the discipline decides to continue the startup sequence | |
255 | * by calling the function dasd_change_state. The eckd disciplines | |
256 | * uses this to start a ccw that detects the format. The completion | |
257 | * interrupt for this detection ccw uses the kernel event daemon to | |
258 | * trigger the call to dasd_change_state. All this is done in the | |
259 | * discipline code, see dasd_eckd.c. | |
90f0094d HH |
260 | * After the analysis ccw is done (do_analysis returned 0) the block |
261 | * device is setup. | |
262 | * In case the analysis returns an error, the device setup is stopped | |
263 | * (a fake disk was already added to allow formatting). | |
1da177e4 | 264 | */ |
8e09f215 | 265 | static int dasd_state_basic_to_ready(struct dasd_device *device) |
1da177e4 LT |
266 | { |
267 | int rc; | |
8e09f215 | 268 | struct dasd_block *block; |
1da177e4 LT |
269 | |
270 | rc = 0; | |
8e09f215 | 271 | block = device->block; |
90f0094d | 272 | /* make disk known with correct capacity */ |
8e09f215 SW |
273 | if (block) { |
274 | if (block->base->discipline->do_analysis != NULL) | |
275 | rc = block->base->discipline->do_analysis(block); | |
276 | if (rc) { | |
277 | if (rc != -EAGAIN) | |
278 | device->state = DASD_STATE_UNFMT; | |
279 | return rc; | |
280 | } | |
281 | dasd_setup_queue(block); | |
282 | set_capacity(block->gdp, | |
283 | block->blocks << block->s2b_shift); | |
284 | device->state = DASD_STATE_READY; | |
285 | rc = dasd_scan_partitions(block); | |
286 | if (rc) | |
287 | device->state = DASD_STATE_BASIC; | |
288 | } else { | |
289 | device->state = DASD_STATE_READY; | |
290 | } | |
90f0094d | 291 | return rc; |
1da177e4 LT |
292 | } |
293 | ||
294 | /* | |
295 | * Remove device from block device layer. Destroy dirty buffers. | |
296 | * Forget format information. Check if the target level is basic | |
297 | * and if it is create fake disk for formatting. | |
298 | */ | |
8e09f215 | 299 | static int dasd_state_ready_to_basic(struct dasd_device *device) |
1da177e4 | 300 | { |
8f61701b HH |
301 | int rc; |
302 | ||
1da177e4 | 303 | device->state = DASD_STATE_BASIC; |
8e09f215 SW |
304 | if (device->block) { |
305 | struct dasd_block *block = device->block; | |
306 | rc = dasd_flush_block_queue(block); | |
307 | if (rc) { | |
308 | device->state = DASD_STATE_READY; | |
309 | return rc; | |
310 | } | |
311 | dasd_destroy_partitions(block); | |
312 | dasd_flush_request_queue(block); | |
313 | block->blocks = 0; | |
314 | block->bp_block = 0; | |
315 | block->s2b_shift = 0; | |
316 | } | |
8f61701b | 317 | return 0; |
1da177e4 LT |
318 | } |
319 | ||
90f0094d HH |
320 | /* |
321 | * Back to basic. | |
322 | */ | |
8e09f215 | 323 | static int dasd_state_unfmt_to_basic(struct dasd_device *device) |
90f0094d HH |
324 | { |
325 | device->state = DASD_STATE_BASIC; | |
8f61701b | 326 | return 0; |
90f0094d HH |
327 | } |
328 | ||
1da177e4 LT |
329 | /* |
330 | * Make the device online and schedule the bottom half to start | |
331 | * the requeueing of requests from the linux request queue to the | |
332 | * ccw queue. | |
333 | */ | |
8f61701b | 334 | static int |
1da177e4 LT |
335 | dasd_state_ready_to_online(struct dasd_device * device) |
336 | { | |
8e09f215 SW |
337 | int rc; |
338 | ||
339 | if (device->discipline->ready_to_online) { | |
340 | rc = device->discipline->ready_to_online(device); | |
341 | if (rc) | |
342 | return rc; | |
343 | } | |
1da177e4 | 344 | device->state = DASD_STATE_ONLINE; |
8e09f215 SW |
345 | if (device->block) |
346 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
347 | return 0; |
348 | } | |
349 | ||
350 | /* | |
351 | * Stop the requeueing of requests again. | |
352 | */ | |
8e09f215 | 353 | static int dasd_state_online_to_ready(struct dasd_device *device) |
1da177e4 | 354 | { |
8e09f215 SW |
355 | int rc; |
356 | ||
357 | if (device->discipline->online_to_ready) { | |
358 | rc = device->discipline->online_to_ready(device); | |
359 | if (rc) | |
360 | return rc; | |
361 | } | |
1da177e4 | 362 | device->state = DASD_STATE_READY; |
8f61701b | 363 | return 0; |
1da177e4 LT |
364 | } |
365 | ||
366 | /* | |
367 | * Device startup state changes. | |
368 | */ | |
8e09f215 | 369 | static int dasd_increase_state(struct dasd_device *device) |
1da177e4 LT |
370 | { |
371 | int rc; | |
372 | ||
373 | rc = 0; | |
374 | if (device->state == DASD_STATE_NEW && | |
375 | device->target >= DASD_STATE_KNOWN) | |
376 | rc = dasd_state_new_to_known(device); | |
377 | ||
378 | if (!rc && | |
379 | device->state == DASD_STATE_KNOWN && | |
380 | device->target >= DASD_STATE_BASIC) | |
381 | rc = dasd_state_known_to_basic(device); | |
382 | ||
383 | if (!rc && | |
384 | device->state == DASD_STATE_BASIC && | |
385 | device->target >= DASD_STATE_READY) | |
386 | rc = dasd_state_basic_to_ready(device); | |
387 | ||
39ccf95e HH |
388 | if (!rc && |
389 | device->state == DASD_STATE_UNFMT && | |
390 | device->target > DASD_STATE_UNFMT) | |
391 | rc = -EPERM; | |
392 | ||
1da177e4 LT |
393 | if (!rc && |
394 | device->state == DASD_STATE_READY && | |
395 | device->target >= DASD_STATE_ONLINE) | |
396 | rc = dasd_state_ready_to_online(device); | |
397 | ||
398 | return rc; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Device shutdown state changes. | |
403 | */ | |
8e09f215 | 404 | static int dasd_decrease_state(struct dasd_device *device) |
1da177e4 | 405 | { |
8f61701b HH |
406 | int rc; |
407 | ||
408 | rc = 0; | |
1da177e4 LT |
409 | if (device->state == DASD_STATE_ONLINE && |
410 | device->target <= DASD_STATE_READY) | |
8f61701b | 411 | rc = dasd_state_online_to_ready(device); |
138c014d | 412 | |
8f61701b HH |
413 | if (!rc && |
414 | device->state == DASD_STATE_READY && | |
1da177e4 | 415 | device->target <= DASD_STATE_BASIC) |
8f61701b | 416 | rc = dasd_state_ready_to_basic(device); |
90f0094d | 417 | |
8f61701b HH |
418 | if (!rc && |
419 | device->state == DASD_STATE_UNFMT && | |
90f0094d | 420 | device->target <= DASD_STATE_BASIC) |
8f61701b | 421 | rc = dasd_state_unfmt_to_basic(device); |
90f0094d | 422 | |
8f61701b HH |
423 | if (!rc && |
424 | device->state == DASD_STATE_BASIC && | |
1da177e4 | 425 | device->target <= DASD_STATE_KNOWN) |
8f61701b | 426 | rc = dasd_state_basic_to_known(device); |
138c014d | 427 | |
8f61701b HH |
428 | if (!rc && |
429 | device->state == DASD_STATE_KNOWN && | |
1da177e4 | 430 | device->target <= DASD_STATE_NEW) |
8f61701b | 431 | rc = dasd_state_known_to_new(device); |
1da177e4 | 432 | |
8f61701b | 433 | return rc; |
1da177e4 LT |
434 | } |
435 | ||
436 | /* | |
437 | * This is the main startup/shutdown routine. | |
438 | */ | |
8e09f215 | 439 | static void dasd_change_state(struct dasd_device *device) |
1da177e4 LT |
440 | { |
441 | int rc; | |
442 | ||
443 | if (device->state == device->target) | |
444 | /* Already where we want to go today... */ | |
445 | return; | |
446 | if (device->state < device->target) | |
447 | rc = dasd_increase_state(device); | |
448 | else | |
449 | rc = dasd_decrease_state(device); | |
450 | if (rc && rc != -EAGAIN) | |
451 | device->target = device->state; | |
452 | ||
453 | if (device->state == device->target) | |
454 | wake_up(&dasd_init_waitq); | |
4dfd5c45 HH |
455 | |
456 | /* let user-space know that the device status changed */ | |
457 | kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); | |
1da177e4 LT |
458 | } |
459 | ||
460 | /* | |
461 | * Kick starter for devices that did not complete the startup/shutdown | |
462 | * procedure or were sleeping because of a pending state. | |
463 | * dasd_kick_device will schedule a call do do_kick_device to the kernel | |
464 | * event daemon. | |
465 | */ | |
8e09f215 | 466 | static void do_kick_device(struct work_struct *work) |
1da177e4 | 467 | { |
4927b3f7 | 468 | struct dasd_device *device = container_of(work, struct dasd_device, kick_work); |
1da177e4 | 469 | dasd_change_state(device); |
8e09f215 | 470 | dasd_schedule_device_bh(device); |
1da177e4 LT |
471 | dasd_put_device(device); |
472 | } | |
473 | ||
8e09f215 | 474 | void dasd_kick_device(struct dasd_device *device) |
1da177e4 LT |
475 | { |
476 | dasd_get_device(device); | |
477 | /* queue call to dasd_kick_device to the kernel event daemon. */ | |
478 | schedule_work(&device->kick_work); | |
479 | } | |
480 | ||
481 | /* | |
482 | * Set the target state for a device and starts the state change. | |
483 | */ | |
8e09f215 | 484 | void dasd_set_target_state(struct dasd_device *device, int target) |
1da177e4 LT |
485 | { |
486 | /* If we are in probeonly mode stop at DASD_STATE_READY. */ | |
487 | if (dasd_probeonly && target > DASD_STATE_READY) | |
488 | target = DASD_STATE_READY; | |
489 | if (device->target != target) { | |
490 | if (device->state == target) | |
491 | wake_up(&dasd_init_waitq); | |
492 | device->target = target; | |
493 | } | |
494 | if (device->state != device->target) | |
495 | dasd_change_state(device); | |
496 | } | |
497 | ||
498 | /* | |
499 | * Enable devices with device numbers in [from..to]. | |
500 | */ | |
8e09f215 | 501 | static inline int _wait_for_device(struct dasd_device *device) |
1da177e4 LT |
502 | { |
503 | return (device->state == device->target); | |
504 | } | |
505 | ||
8e09f215 | 506 | void dasd_enable_device(struct dasd_device *device) |
1da177e4 LT |
507 | { |
508 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
509 | if (device->state <= DASD_STATE_KNOWN) | |
510 | /* No discipline for device found. */ | |
511 | dasd_set_target_state(device, DASD_STATE_NEW); | |
512 | /* Now wait for the devices to come up. */ | |
513 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
514 | } | |
515 | ||
516 | /* | |
517 | * SECTION: device operation (interrupt handler, start i/o, term i/o ...) | |
518 | */ | |
519 | #ifdef CONFIG_DASD_PROFILE | |
520 | ||
521 | struct dasd_profile_info_t dasd_global_profile; | |
522 | unsigned int dasd_profile_level = DASD_PROFILE_OFF; | |
523 | ||
524 | /* | |
525 | * Increments counter in global and local profiling structures. | |
526 | */ | |
8e09f215 | 527 | #define dasd_profile_counter(value, counter, block) \ |
1da177e4 LT |
528 | { \ |
529 | int index; \ | |
530 | for (index = 0; index < 31 && value >> (2+index); index++); \ | |
531 | dasd_global_profile.counter[index]++; \ | |
8e09f215 | 532 | block->profile.counter[index]++; \ |
1da177e4 LT |
533 | } |
534 | ||
535 | /* | |
536 | * Add profiling information for cqr before execution. | |
537 | */ | |
8e09f215 SW |
538 | static void dasd_profile_start(struct dasd_block *block, |
539 | struct dasd_ccw_req *cqr, | |
540 | struct request *req) | |
1da177e4 LT |
541 | { |
542 | struct list_head *l; | |
543 | unsigned int counter; | |
544 | ||
545 | if (dasd_profile_level != DASD_PROFILE_ON) | |
546 | return; | |
547 | ||
548 | /* count the length of the chanq for statistics */ | |
549 | counter = 0; | |
8e09f215 | 550 | list_for_each(l, &block->ccw_queue) |
1da177e4 LT |
551 | if (++counter >= 31) |
552 | break; | |
553 | dasd_global_profile.dasd_io_nr_req[counter]++; | |
8e09f215 | 554 | block->profile.dasd_io_nr_req[counter]++; |
1da177e4 LT |
555 | } |
556 | ||
557 | /* | |
558 | * Add profiling information for cqr after execution. | |
559 | */ | |
8e09f215 SW |
560 | static void dasd_profile_end(struct dasd_block *block, |
561 | struct dasd_ccw_req *cqr, | |
562 | struct request *req) | |
1da177e4 LT |
563 | { |
564 | long strtime, irqtime, endtime, tottime; /* in microseconds */ | |
565 | long tottimeps, sectors; | |
566 | ||
567 | if (dasd_profile_level != DASD_PROFILE_ON) | |
568 | return; | |
569 | ||
570 | sectors = req->nr_sectors; | |
571 | if (!cqr->buildclk || !cqr->startclk || | |
572 | !cqr->stopclk || !cqr->endclk || | |
573 | !sectors) | |
574 | return; | |
575 | ||
576 | strtime = ((cqr->startclk - cqr->buildclk) >> 12); | |
577 | irqtime = ((cqr->stopclk - cqr->startclk) >> 12); | |
578 | endtime = ((cqr->endclk - cqr->stopclk) >> 12); | |
579 | tottime = ((cqr->endclk - cqr->buildclk) >> 12); | |
580 | tottimeps = tottime / sectors; | |
581 | ||
582 | if (!dasd_global_profile.dasd_io_reqs) | |
583 | memset(&dasd_global_profile, 0, | |
8e09f215 | 584 | sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
585 | dasd_global_profile.dasd_io_reqs++; |
586 | dasd_global_profile.dasd_io_sects += sectors; | |
587 | ||
8e09f215 SW |
588 | if (!block->profile.dasd_io_reqs) |
589 | memset(&block->profile, 0, | |
590 | sizeof(struct dasd_profile_info_t)); | |
591 | block->profile.dasd_io_reqs++; | |
592 | block->profile.dasd_io_sects += sectors; | |
1da177e4 | 593 | |
8e09f215 SW |
594 | dasd_profile_counter(sectors, dasd_io_secs, block); |
595 | dasd_profile_counter(tottime, dasd_io_times, block); | |
596 | dasd_profile_counter(tottimeps, dasd_io_timps, block); | |
597 | dasd_profile_counter(strtime, dasd_io_time1, block); | |
598 | dasd_profile_counter(irqtime, dasd_io_time2, block); | |
599 | dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block); | |
600 | dasd_profile_counter(endtime, dasd_io_time3, block); | |
1da177e4 LT |
601 | } |
602 | #else | |
8e09f215 SW |
603 | #define dasd_profile_start(block, cqr, req) do {} while (0) |
604 | #define dasd_profile_end(block, cqr, req) do {} while (0) | |
1da177e4 LT |
605 | #endif /* CONFIG_DASD_PROFILE */ |
606 | ||
607 | /* | |
608 | * Allocate memory for a channel program with 'cplength' channel | |
609 | * command words and 'datasize' additional space. There are two | |
610 | * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed | |
611 | * memory and 2) dasd_smalloc_request uses the static ccw memory | |
612 | * that gets allocated for each device. | |
613 | */ | |
8e09f215 SW |
614 | struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength, |
615 | int datasize, | |
616 | struct dasd_device *device) | |
1da177e4 LT |
617 | { |
618 | struct dasd_ccw_req *cqr; | |
619 | ||
620 | /* Sanity checks */ | |
7ac1e877 ES |
621 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
622 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 | 623 | |
88abaab4 | 624 | cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); |
1da177e4 LT |
625 | if (cqr == NULL) |
626 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
627 | cqr->cpaddr = NULL; |
628 | if (cplength > 0) { | |
88abaab4 | 629 | cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), |
1da177e4 LT |
630 | GFP_ATOMIC | GFP_DMA); |
631 | if (cqr->cpaddr == NULL) { | |
632 | kfree(cqr); | |
633 | return ERR_PTR(-ENOMEM); | |
634 | } | |
1da177e4 LT |
635 | } |
636 | cqr->data = NULL; | |
637 | if (datasize > 0) { | |
88abaab4 | 638 | cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); |
1da177e4 | 639 | if (cqr->data == NULL) { |
17fd682e | 640 | kfree(cqr->cpaddr); |
1da177e4 LT |
641 | kfree(cqr); |
642 | return ERR_PTR(-ENOMEM); | |
643 | } | |
1da177e4 LT |
644 | } |
645 | strncpy((char *) &cqr->magic, magic, 4); | |
646 | ASCEBC((char *) &cqr->magic, 4); | |
647 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
648 | dasd_get_device(device); | |
649 | return cqr; | |
650 | } | |
651 | ||
8e09f215 SW |
652 | struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength, |
653 | int datasize, | |
654 | struct dasd_device *device) | |
1da177e4 LT |
655 | { |
656 | unsigned long flags; | |
657 | struct dasd_ccw_req *cqr; | |
658 | char *data; | |
659 | int size; | |
660 | ||
661 | /* Sanity checks */ | |
7ac1e877 ES |
662 | BUG_ON( magic == NULL || datasize > PAGE_SIZE || |
663 | (cplength*sizeof(struct ccw1)) > PAGE_SIZE); | |
1da177e4 LT |
664 | |
665 | size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; | |
666 | if (cplength > 0) | |
667 | size += cplength * sizeof(struct ccw1); | |
668 | if (datasize > 0) | |
669 | size += datasize; | |
670 | spin_lock_irqsave(&device->mem_lock, flags); | |
671 | cqr = (struct dasd_ccw_req *) | |
672 | dasd_alloc_chunk(&device->ccw_chunks, size); | |
673 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
674 | if (cqr == NULL) | |
675 | return ERR_PTR(-ENOMEM); | |
676 | memset(cqr, 0, sizeof(struct dasd_ccw_req)); | |
677 | data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); | |
678 | cqr->cpaddr = NULL; | |
679 | if (cplength > 0) { | |
680 | cqr->cpaddr = (struct ccw1 *) data; | |
681 | data += cplength*sizeof(struct ccw1); | |
682 | memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); | |
683 | } | |
684 | cqr->data = NULL; | |
685 | if (datasize > 0) { | |
686 | cqr->data = data; | |
687 | memset(cqr->data, 0, datasize); | |
688 | } | |
689 | strncpy((char *) &cqr->magic, magic, 4); | |
690 | ASCEBC((char *) &cqr->magic, 4); | |
691 | set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
692 | dasd_get_device(device); | |
693 | return cqr; | |
694 | } | |
695 | ||
696 | /* | |
697 | * Free memory of a channel program. This function needs to free all the | |
698 | * idal lists that might have been created by dasd_set_cda and the | |
699 | * struct dasd_ccw_req itself. | |
700 | */ | |
8e09f215 | 701 | void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 | 702 | { |
347a8dc3 | 703 | #ifdef CONFIG_64BIT |
1da177e4 LT |
704 | struct ccw1 *ccw; |
705 | ||
706 | /* Clear any idals used for the request. */ | |
707 | ccw = cqr->cpaddr; | |
708 | do { | |
709 | clear_normalized_cda(ccw); | |
710 | } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); | |
711 | #endif | |
17fd682e JJ |
712 | kfree(cqr->cpaddr); |
713 | kfree(cqr->data); | |
1da177e4 LT |
714 | kfree(cqr); |
715 | dasd_put_device(device); | |
716 | } | |
717 | ||
8e09f215 | 718 | void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) |
1da177e4 LT |
719 | { |
720 | unsigned long flags; | |
721 | ||
722 | spin_lock_irqsave(&device->mem_lock, flags); | |
723 | dasd_free_chunk(&device->ccw_chunks, cqr); | |
724 | spin_unlock_irqrestore(&device->mem_lock, flags); | |
725 | dasd_put_device(device); | |
726 | } | |
727 | ||
728 | /* | |
729 | * Check discipline magic in cqr. | |
730 | */ | |
8e09f215 | 731 | static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) |
1da177e4 LT |
732 | { |
733 | struct dasd_device *device; | |
734 | ||
735 | if (cqr == NULL) | |
736 | return -EINVAL; | |
8e09f215 | 737 | device = cqr->startdev; |
1da177e4 LT |
738 | if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { |
739 | DEV_MESSAGE(KERN_WARNING, device, | |
740 | " dasd_ccw_req 0x%08x magic doesn't match" | |
741 | " discipline 0x%08x", | |
742 | cqr->magic, | |
743 | *(unsigned int *) device->discipline->name); | |
744 | return -EINVAL; | |
745 | } | |
746 | return 0; | |
747 | } | |
748 | ||
749 | /* | |
750 | * Terminate the current i/o and set the request to clear_pending. | |
751 | * Timer keeps device runnig. | |
752 | * ccw_device_clear can fail if the i/o subsystem | |
753 | * is in a bad mood. | |
754 | */ | |
8e09f215 | 755 | int dasd_term_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
756 | { |
757 | struct dasd_device *device; | |
758 | int retries, rc; | |
759 | ||
760 | /* Check the cqr */ | |
761 | rc = dasd_check_cqr(cqr); | |
762 | if (rc) | |
763 | return rc; | |
764 | retries = 0; | |
8e09f215 | 765 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
766 | while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { |
767 | rc = ccw_device_clear(device->cdev, (long) cqr); | |
768 | switch (rc) { | |
769 | case 0: /* termination successful */ | |
c2ba444d | 770 | cqr->retries--; |
8e09f215 | 771 | cqr->status = DASD_CQR_CLEAR_PENDING; |
1da177e4 | 772 | cqr->stopclk = get_clock(); |
8f61701b | 773 | cqr->starttime = 0; |
1da177e4 LT |
774 | DBF_DEV_EVENT(DBF_DEBUG, device, |
775 | "terminate cqr %p successful", | |
776 | cqr); | |
777 | break; | |
778 | case -ENODEV: | |
779 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
780 | "device gone, retry"); | |
781 | break; | |
782 | case -EIO: | |
783 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
784 | "I/O error, retry"); | |
785 | break; | |
786 | case -EINVAL: | |
787 | case -EBUSY: | |
788 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
789 | "device busy, retry later"); | |
790 | break; | |
791 | default: | |
792 | DEV_MESSAGE(KERN_ERR, device, | |
793 | "line %d unknown RC=%d, please " | |
794 | "report to linux390@de.ibm.com", | |
795 | __LINE__, rc); | |
796 | BUG(); | |
797 | break; | |
798 | } | |
799 | retries++; | |
800 | } | |
8e09f215 | 801 | dasd_schedule_device_bh(device); |
1da177e4 LT |
802 | return rc; |
803 | } | |
804 | ||
805 | /* | |
806 | * Start the i/o. This start_IO can fail if the channel is really busy. | |
807 | * In that case set up a timer to start the request later. | |
808 | */ | |
8e09f215 | 809 | int dasd_start_IO(struct dasd_ccw_req *cqr) |
1da177e4 LT |
810 | { |
811 | struct dasd_device *device; | |
812 | int rc; | |
813 | ||
814 | /* Check the cqr */ | |
815 | rc = dasd_check_cqr(cqr); | |
816 | if (rc) | |
817 | return rc; | |
8e09f215 | 818 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 LT |
819 | if (cqr->retries < 0) { |
820 | DEV_MESSAGE(KERN_DEBUG, device, | |
821 | "start_IO: request %p (%02x/%i) - no retry left.", | |
822 | cqr, cqr->status, cqr->retries); | |
8e09f215 | 823 | cqr->status = DASD_CQR_ERROR; |
1da177e4 LT |
824 | return -EIO; |
825 | } | |
826 | cqr->startclk = get_clock(); | |
827 | cqr->starttime = jiffies; | |
828 | cqr->retries--; | |
829 | rc = ccw_device_start(device->cdev, cqr->cpaddr, (long) cqr, | |
830 | cqr->lpm, 0); | |
831 | switch (rc) { | |
832 | case 0: | |
833 | cqr->status = DASD_CQR_IN_IO; | |
834 | DBF_DEV_EVENT(DBF_DEBUG, device, | |
835 | "start_IO: request %p started successful", | |
836 | cqr); | |
837 | break; | |
838 | case -EBUSY: | |
839 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
840 | "start_IO: device busy, retry later"); | |
841 | break; | |
842 | case -ETIMEDOUT: | |
843 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
844 | "start_IO: request timeout, retry later"); | |
845 | break; | |
846 | case -EACCES: | |
847 | /* -EACCES indicates that the request used only a | |
848 | * subset of the available pathes and all these | |
849 | * pathes are gone. | |
850 | * Do a retry with all available pathes. | |
851 | */ | |
852 | cqr->lpm = LPM_ANYPATH; | |
853 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
854 | "start_IO: selected pathes gone," | |
855 | " retry on all pathes"); | |
856 | break; | |
857 | case -ENODEV: | |
858 | case -EIO: | |
859 | DBF_DEV_EVENT(DBF_ERR, device, "%s", | |
860 | "start_IO: device gone, retry"); | |
861 | break; | |
862 | default: | |
863 | DEV_MESSAGE(KERN_ERR, device, | |
864 | "line %d unknown RC=%d, please report" | |
865 | " to linux390@de.ibm.com", __LINE__, rc); | |
866 | BUG(); | |
867 | break; | |
868 | } | |
869 | return rc; | |
870 | } | |
871 | ||
872 | /* | |
873 | * Timeout function for dasd devices. This is used for different purposes | |
874 | * 1) missing interrupt handler for normal operation | |
875 | * 2) delayed start of request where start_IO failed with -EBUSY | |
876 | * 3) timeout for missing state change interrupts | |
877 | * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), | |
878 | * DASD_CQR_QUEUED for 2) and 3). | |
879 | */ | |
8e09f215 | 880 | static void dasd_device_timeout(unsigned long ptr) |
1da177e4 LT |
881 | { |
882 | unsigned long flags; | |
883 | struct dasd_device *device; | |
884 | ||
885 | device = (struct dasd_device *) ptr; | |
886 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
887 | /* re-activate request queue */ | |
888 | device->stopped &= ~DASD_STOPPED_PENDING; | |
889 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
8e09f215 | 890 | dasd_schedule_device_bh(device); |
1da177e4 LT |
891 | } |
892 | ||
893 | /* | |
894 | * Setup timeout for a device in jiffies. | |
895 | */ | |
8e09f215 | 896 | void dasd_device_set_timer(struct dasd_device *device, int expires) |
1da177e4 LT |
897 | { |
898 | if (expires == 0) { | |
899 | if (timer_pending(&device->timer)) | |
900 | del_timer(&device->timer); | |
901 | return; | |
902 | } | |
903 | if (timer_pending(&device->timer)) { | |
904 | if (mod_timer(&device->timer, jiffies + expires)) | |
905 | return; | |
906 | } | |
8e09f215 | 907 | device->timer.function = dasd_device_timeout; |
1da177e4 LT |
908 | device->timer.data = (unsigned long) device; |
909 | device->timer.expires = jiffies + expires; | |
910 | add_timer(&device->timer); | |
911 | } | |
912 | ||
913 | /* | |
914 | * Clear timeout for a device. | |
915 | */ | |
8e09f215 | 916 | void dasd_device_clear_timer(struct dasd_device *device) |
1da177e4 LT |
917 | { |
918 | if (timer_pending(&device->timer)) | |
919 | del_timer(&device->timer); | |
920 | } | |
921 | ||
8e09f215 SW |
922 | static void dasd_handle_killed_request(struct ccw_device *cdev, |
923 | unsigned long intparm) | |
1da177e4 LT |
924 | { |
925 | struct dasd_ccw_req *cqr; | |
926 | struct dasd_device *device; | |
927 | ||
928 | cqr = (struct dasd_ccw_req *) intparm; | |
929 | if (cqr->status != DASD_CQR_IN_IO) { | |
930 | MESSAGE(KERN_DEBUG, | |
931 | "invalid status in handle_killed_request: " | |
932 | "bus_id %s, status %02x", | |
933 | cdev->dev.bus_id, cqr->status); | |
934 | return; | |
935 | } | |
936 | ||
8e09f215 | 937 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 938 | if (device == NULL || |
a00bfd71 | 939 | device != dasd_device_from_cdev_locked(cdev) || |
1da177e4 LT |
940 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
941 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
942 | cdev->dev.bus_id); | |
943 | return; | |
944 | } | |
945 | ||
946 | /* Schedule request to be retried. */ | |
947 | cqr->status = DASD_CQR_QUEUED; | |
948 | ||
8e09f215 SW |
949 | dasd_device_clear_timer(device); |
950 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
951 | dasd_put_device(device); |
952 | } | |
953 | ||
8e09f215 | 954 | void dasd_generic_handle_state_change(struct dasd_device *device) |
1da177e4 | 955 | { |
20c64468 SW |
956 | /* First of all start sense subsystem status request. */ |
957 | dasd_eer_snss(device); | |
958 | ||
1da177e4 | 959 | device->stopped &= ~DASD_STOPPED_PENDING; |
8e09f215 SW |
960 | dasd_schedule_device_bh(device); |
961 | if (device->block) | |
962 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
963 | } |
964 | ||
965 | /* | |
966 | * Interrupt handler for "normal" ssch-io based dasd devices. | |
967 | */ | |
8e09f215 SW |
968 | void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, |
969 | struct irb *irb) | |
1da177e4 LT |
970 | { |
971 | struct dasd_ccw_req *cqr, *next; | |
972 | struct dasd_device *device; | |
973 | unsigned long long now; | |
974 | int expires; | |
1da177e4 LT |
975 | |
976 | if (IS_ERR(irb)) { | |
977 | switch (PTR_ERR(irb)) { | |
978 | case -EIO: | |
979 | dasd_handle_killed_request(cdev, intparm); | |
980 | break; | |
981 | case -ETIMEDOUT: | |
982 | printk(KERN_WARNING"%s(%s): request timed out\n", | |
983 | __FUNCTION__, cdev->dev.bus_id); | |
984 | //FIXME - dasd uses own timeout interface... | |
985 | break; | |
986 | default: | |
987 | printk(KERN_WARNING"%s(%s): unknown error %ld\n", | |
988 | __FUNCTION__, cdev->dev.bus_id, PTR_ERR(irb)); | |
989 | } | |
990 | return; | |
991 | } | |
992 | ||
993 | now = get_clock(); | |
994 | ||
995 | DBF_EVENT(DBF_ERR, "Interrupt: bus_id %s CS/DS %04x ip %08x", | |
996 | cdev->dev.bus_id, ((irb->scsw.cstat<<8)|irb->scsw.dstat), | |
997 | (unsigned int) intparm); | |
998 | ||
8e09f215 SW |
999 | /* check for unsolicited interrupts */ |
1000 | cqr = (struct dasd_ccw_req *) intparm; | |
1001 | if (!cqr || ((irb->scsw.cc == 1) && | |
1002 | (irb->scsw.fctl & SCSW_FCTL_START_FUNC) && | |
1003 | (irb->scsw.stctl & SCSW_STCTL_STATUS_PEND)) ) { | |
1004 | if (cqr && cqr->status == DASD_CQR_IN_IO) | |
1005 | cqr->status = DASD_CQR_QUEUED; | |
a00bfd71 | 1006 | device = dasd_device_from_cdev_locked(cdev); |
1da177e4 | 1007 | if (!IS_ERR(device)) { |
8e09f215 SW |
1008 | dasd_device_clear_timer(device); |
1009 | device->discipline->handle_unsolicited_interrupt(device, | |
1010 | irb); | |
1da177e4 LT |
1011 | dasd_put_device(device); |
1012 | } | |
1013 | return; | |
1014 | } | |
1015 | ||
8e09f215 SW |
1016 | device = (struct dasd_device *) cqr->startdev; |
1017 | if (!device || | |
1da177e4 LT |
1018 | strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
1019 | MESSAGE(KERN_DEBUG, "invalid device in request: bus_id %s", | |
1020 | cdev->dev.bus_id); | |
1021 | return; | |
1022 | } | |
1023 | ||
1024 | /* Check for clear pending */ | |
8e09f215 | 1025 | if (cqr->status == DASD_CQR_CLEAR_PENDING && |
1da177e4 | 1026 | irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) { |
8e09f215 SW |
1027 | cqr->status = DASD_CQR_CLEARED; |
1028 | dasd_device_clear_timer(device); | |
8f61701b | 1029 | wake_up(&dasd_flush_wq); |
8e09f215 | 1030 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1031 | return; |
1032 | } | |
1033 | ||
1034 | /* check status - the request might have been killed by dyn detach */ | |
1035 | if (cqr->status != DASD_CQR_IN_IO) { | |
1036 | MESSAGE(KERN_DEBUG, | |
1037 | "invalid status: bus_id %s, status %02x", | |
1038 | cdev->dev.bus_id, cqr->status); | |
1039 | return; | |
1040 | } | |
1041 | DBF_DEV_EVENT(DBF_DEBUG, device, "Int: CS/DS 0x%04x for cqr %p", | |
1042 | ((irb->scsw.cstat << 8) | irb->scsw.dstat), cqr); | |
8e09f215 | 1043 | next = NULL; |
1da177e4 | 1044 | expires = 0; |
8e09f215 SW |
1045 | if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && |
1046 | irb->scsw.cstat == 0 && !irb->esw.esw0.erw.cons) { | |
1047 | /* request was completed successfully */ | |
1048 | cqr->status = DASD_CQR_SUCCESS; | |
1da177e4 LT |
1049 | cqr->stopclk = now; |
1050 | /* Start first request on queue if possible -> fast_io. */ | |
8e09f215 SW |
1051 | if (cqr->devlist.next != &device->ccw_queue) { |
1052 | next = list_entry(cqr->devlist.next, | |
1053 | struct dasd_ccw_req, devlist); | |
1da177e4 | 1054 | } |
8e09f215 SW |
1055 | } else { /* error */ |
1056 | memcpy(&cqr->irb, irb, sizeof(struct irb)); | |
9575bf26 | 1057 | if (device->features & DASD_FEATURE_ERPLOG) { |
9575bf26 HH |
1058 | dasd_log_sense(cqr, irb); |
1059 | } | |
8e09f215 SW |
1060 | /* If we have no sense data, or we just don't want complex ERP |
1061 | * for this request, but if we have retries left, then just | |
1062 | * reset this request and retry it in the fastpath | |
1063 | */ | |
1064 | if (!(cqr->irb.esw.esw0.erw.cons && | |
1065 | test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) && | |
1066 | cqr->retries > 0) { | |
1067 | DEV_MESSAGE(KERN_DEBUG, device, | |
1068 | "default ERP in fastpath (%i retries left)", | |
1069 | cqr->retries); | |
1070 | cqr->lpm = LPM_ANYPATH; | |
1071 | cqr->status = DASD_CQR_QUEUED; | |
1072 | next = cqr; | |
1073 | } else | |
1da177e4 | 1074 | cqr->status = DASD_CQR_ERROR; |
8e09f215 SW |
1075 | } |
1076 | if (next && (next->status == DASD_CQR_QUEUED) && | |
1077 | (!device->stopped)) { | |
1078 | if (device->discipline->start_IO(next) == 0) | |
1079 | expires = next->expires; | |
1080 | else | |
1081 | DEV_MESSAGE(KERN_DEBUG, device, "%s", | |
1082 | "Interrupt fastpath " | |
1083 | "failed!"); | |
1da177e4 LT |
1084 | } |
1085 | if (expires != 0) | |
8e09f215 | 1086 | dasd_device_set_timer(device, expires); |
1da177e4 | 1087 | else |
8e09f215 SW |
1088 | dasd_device_clear_timer(device); |
1089 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
1090 | } |
1091 | ||
1092 | /* | |
8e09f215 SW |
1093 | * If we have an error on a dasd_block layer request then we cancel |
1094 | * and return all further requests from the same dasd_block as well. | |
1da177e4 | 1095 | */ |
8e09f215 SW |
1096 | static void __dasd_device_recovery(struct dasd_device *device, |
1097 | struct dasd_ccw_req *ref_cqr) | |
1da177e4 | 1098 | { |
8e09f215 SW |
1099 | struct list_head *l, *n; |
1100 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1101 | |
8e09f215 SW |
1102 | /* |
1103 | * only requeue request that came from the dasd_block layer | |
1104 | */ | |
1105 | if (!ref_cqr->block) | |
1106 | return; | |
1da177e4 | 1107 | |
8e09f215 SW |
1108 | list_for_each_safe(l, n, &device->ccw_queue) { |
1109 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1110 | if (cqr->status == DASD_CQR_QUEUED && | |
1111 | ref_cqr->block == cqr->block) { | |
1112 | cqr->status = DASD_CQR_CLEARED; | |
1113 | } | |
1114 | } | |
1115 | }; | |
1da177e4 LT |
1116 | |
1117 | /* | |
8e09f215 SW |
1118 | * Remove those ccw requests from the queue that need to be returned |
1119 | * to the upper layer. | |
1da177e4 | 1120 | */ |
8e09f215 SW |
1121 | static void __dasd_device_process_ccw_queue(struct dasd_device *device, |
1122 | struct list_head *final_queue) | |
1da177e4 LT |
1123 | { |
1124 | struct list_head *l, *n; | |
1125 | struct dasd_ccw_req *cqr; | |
1da177e4 | 1126 | |
1da177e4 LT |
1127 | /* Process request with final status. */ |
1128 | list_for_each_safe(l, n, &device->ccw_queue) { | |
8e09f215 SW |
1129 | cqr = list_entry(l, struct dasd_ccw_req, devlist); |
1130 | ||
1da177e4 | 1131 | /* Stop list processing at the first non-final request. */ |
8e09f215 SW |
1132 | if (cqr->status == DASD_CQR_QUEUED || |
1133 | cqr->status == DASD_CQR_IN_IO || | |
1134 | cqr->status == DASD_CQR_CLEAR_PENDING) | |
1da177e4 | 1135 | break; |
1da177e4 | 1136 | if (cqr->status == DASD_CQR_ERROR) { |
8e09f215 | 1137 | __dasd_device_recovery(device, cqr); |
20c64468 | 1138 | } |
1da177e4 | 1139 | /* Rechain finished requests to final queue */ |
8e09f215 | 1140 | list_move_tail(&cqr->devlist, final_queue); |
1da177e4 LT |
1141 | } |
1142 | } | |
1143 | ||
1da177e4 | 1144 | /* |
8e09f215 SW |
1145 | * the cqrs from the final queue are returned to the upper layer |
1146 | * by setting a dasd_block state and calling the callback function | |
1da177e4 | 1147 | */ |
8e09f215 SW |
1148 | static void __dasd_device_process_final_queue(struct dasd_device *device, |
1149 | struct list_head *final_queue) | |
1da177e4 | 1150 | { |
8e09f215 | 1151 | struct list_head *l, *n; |
1da177e4 | 1152 | struct dasd_ccw_req *cqr; |
f24acd45 | 1153 | |
8e09f215 SW |
1154 | list_for_each_safe(l, n, final_queue) { |
1155 | cqr = list_entry(l, struct dasd_ccw_req, devlist); | |
1156 | list_del_init(&cqr->devlist); | |
1157 | if (cqr->block) | |
1158 | spin_lock_bh(&cqr->block->queue_lock); | |
1159 | switch (cqr->status) { | |
1160 | case DASD_CQR_SUCCESS: | |
1161 | cqr->status = DASD_CQR_DONE; | |
1162 | break; | |
1163 | case DASD_CQR_ERROR: | |
1164 | cqr->status = DASD_CQR_NEED_ERP; | |
1165 | break; | |
1166 | case DASD_CQR_CLEARED: | |
1167 | cqr->status = DASD_CQR_TERMINATED; | |
1168 | break; | |
1169 | default: | |
1170 | DEV_MESSAGE(KERN_ERR, device, | |
1171 | "wrong cqr status in __dasd_process_final_queue " | |
1172 | "for cqr %p, status %x", | |
1173 | cqr, cqr->status); | |
1174 | BUG(); | |
1da177e4 | 1175 | } |
8e09f215 SW |
1176 | if (cqr->block) |
1177 | spin_unlock_bh(&cqr->block->queue_lock); | |
1178 | if (cqr->callback != NULL) | |
1179 | (cqr->callback)(cqr, cqr->callback_data); | |
1da177e4 LT |
1180 | } |
1181 | } | |
1182 | ||
8e09f215 SW |
1183 | |
1184 | ||
1da177e4 LT |
1185 | /* |
1186 | * Take a look at the first request on the ccw queue and check | |
1187 | * if it reached its expire time. If so, terminate the IO. | |
1188 | */ | |
8e09f215 | 1189 | static void __dasd_device_check_expire(struct dasd_device *device) |
1da177e4 LT |
1190 | { |
1191 | struct dasd_ccw_req *cqr; | |
1192 | ||
1193 | if (list_empty(&device->ccw_queue)) | |
1194 | return; | |
8e09f215 | 1195 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
29145a6c HH |
1196 | if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && |
1197 | (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { | |
1198 | if (device->discipline->term_IO(cqr) != 0) { | |
1199 | /* Hmpf, try again in 5 sec */ | |
29145a6c HH |
1200 | DEV_MESSAGE(KERN_ERR, device, |
1201 | "internal error - timeout (%is) expired " | |
1202 | "for cqr %p, termination failed, " | |
1203 | "retrying in 5s", | |
1204 | (cqr->expires/HZ), cqr); | |
7dc1da9f SH |
1205 | cqr->expires += 5*HZ; |
1206 | dasd_device_set_timer(device, 5*HZ); | |
29145a6c | 1207 | } else { |
8f61701b HH |
1208 | DEV_MESSAGE(KERN_ERR, device, |
1209 | "internal error - timeout (%is) expired " | |
1210 | "for cqr %p (%i retries left)", | |
1211 | (cqr->expires/HZ), cqr, cqr->retries); | |
1da177e4 LT |
1212 | } |
1213 | } | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Take a look at the first request on the ccw queue and check | |
1218 | * if it needs to be started. | |
1219 | */ | |
8e09f215 | 1220 | static void __dasd_device_start_head(struct dasd_device *device) |
1da177e4 LT |
1221 | { |
1222 | struct dasd_ccw_req *cqr; | |
1223 | int rc; | |
1224 | ||
1225 | if (list_empty(&device->ccw_queue)) | |
1226 | return; | |
8e09f215 | 1227 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
25ee4cf8 PO |
1228 | if (cqr->status != DASD_CQR_QUEUED) |
1229 | return; | |
8e09f215 SW |
1230 | /* when device is stopped, return request to previous layer */ |
1231 | if (device->stopped) { | |
1232 | cqr->status = DASD_CQR_CLEARED; | |
1233 | dasd_schedule_device_bh(device); | |
25ee4cf8 | 1234 | return; |
1c01b8a5 | 1235 | } |
25ee4cf8 PO |
1236 | |
1237 | rc = device->discipline->start_IO(cqr); | |
1238 | if (rc == 0) | |
8e09f215 | 1239 | dasd_device_set_timer(device, cqr->expires); |
25ee4cf8 | 1240 | else if (rc == -EACCES) { |
8e09f215 | 1241 | dasd_schedule_device_bh(device); |
25ee4cf8 PO |
1242 | } else |
1243 | /* Hmpf, try again in 1/2 sec */ | |
8e09f215 | 1244 | dasd_device_set_timer(device, 50); |
8f61701b HH |
1245 | } |
1246 | ||
1da177e4 | 1247 | /* |
8e09f215 SW |
1248 | * Go through all request on the dasd_device request queue, |
1249 | * terminate them on the cdev if necessary, and return them to the | |
1250 | * submitting layer via callback. | |
1251 | * Note: | |
1252 | * Make sure that all 'submitting layers' still exist when | |
1253 | * this function is called!. In other words, when 'device' is a base | |
1254 | * device then all block layer requests must have been removed before | |
1255 | * via dasd_flush_block_queue. | |
1da177e4 | 1256 | */ |
8e09f215 | 1257 | int dasd_flush_device_queue(struct dasd_device *device) |
1da177e4 | 1258 | { |
8e09f215 SW |
1259 | struct dasd_ccw_req *cqr, *n; |
1260 | int rc; | |
1da177e4 | 1261 | struct list_head flush_queue; |
1da177e4 LT |
1262 | |
1263 | INIT_LIST_HEAD(&flush_queue); | |
1264 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
8f61701b | 1265 | rc = 0; |
8e09f215 | 1266 | list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { |
8f61701b HH |
1267 | /* Check status and move request to flush_queue */ |
1268 | switch (cqr->status) { | |
1269 | case DASD_CQR_IN_IO: | |
1270 | rc = device->discipline->term_IO(cqr); | |
1271 | if (rc) { | |
1272 | /* unable to terminate requeust */ | |
1273 | DEV_MESSAGE(KERN_ERR, device, | |
1274 | "dasd flush ccw_queue is unable " | |
1275 | " to terminate request %p", | |
1276 | cqr); | |
1277 | /* stop flush processing */ | |
1278 | goto finished; | |
1279 | } | |
1280 | break; | |
1281 | case DASD_CQR_QUEUED: | |
1da177e4 | 1282 | cqr->stopclk = get_clock(); |
8e09f215 | 1283 | cqr->status = DASD_CQR_CLEARED; |
8f61701b | 1284 | break; |
8e09f215 | 1285 | default: /* no need to modify the others */ |
8f61701b HH |
1286 | break; |
1287 | } | |
8e09f215 | 1288 | list_move_tail(&cqr->devlist, &flush_queue); |
8f61701b | 1289 | } |
8f61701b HH |
1290 | finished: |
1291 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
8e09f215 SW |
1292 | /* |
1293 | * After this point all requests must be in state CLEAR_PENDING, | |
1294 | * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become | |
1295 | * one of the others. | |
1296 | */ | |
1297 | list_for_each_entry_safe(cqr, n, &flush_queue, devlist) | |
1298 | wait_event(dasd_flush_wq, | |
1299 | (cqr->status != DASD_CQR_CLEAR_PENDING)); | |
1300 | /* | |
1301 | * Now set each request back to TERMINATED, DONE or NEED_ERP | |
1302 | * and call the callback function of flushed requests | |
1303 | */ | |
1304 | __dasd_device_process_final_queue(device, &flush_queue); | |
8f61701b | 1305 | return rc; |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | /* | |
1309 | * Acquire the device lock and process queues for the device. | |
1310 | */ | |
8e09f215 | 1311 | static void dasd_device_tasklet(struct dasd_device *device) |
1da177e4 LT |
1312 | { |
1313 | struct list_head final_queue; | |
1da177e4 LT |
1314 | |
1315 | atomic_set (&device->tasklet_scheduled, 0); | |
1316 | INIT_LIST_HEAD(&final_queue); | |
1317 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1318 | /* Check expire time of first request on the ccw queue. */ | |
8e09f215 SW |
1319 | __dasd_device_check_expire(device); |
1320 | /* find final requests on ccw queue */ | |
1321 | __dasd_device_process_ccw_queue(device, &final_queue); | |
1da177e4 LT |
1322 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1323 | /* Now call the callback function of requests with final status */ | |
8e09f215 SW |
1324 | __dasd_device_process_final_queue(device, &final_queue); |
1325 | spin_lock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 | 1326 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1327 | __dasd_device_start_head(device); |
1328 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1da177e4 LT |
1329 | dasd_put_device(device); |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * Schedules a call to dasd_tasklet over the device tasklet. | |
1334 | */ | |
8e09f215 | 1335 | void dasd_schedule_device_bh(struct dasd_device *device) |
1da177e4 LT |
1336 | { |
1337 | /* Protect against rescheduling. */ | |
973bd993 | 1338 | if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) |
1da177e4 LT |
1339 | return; |
1340 | dasd_get_device(device); | |
1341 | tasklet_hi_schedule(&device->tasklet); | |
1342 | } | |
1343 | ||
1344 | /* | |
8e09f215 SW |
1345 | * Queue a request to the head of the device ccw_queue. |
1346 | * Start the I/O if possible. | |
1da177e4 | 1347 | */ |
8e09f215 | 1348 | void dasd_add_request_head(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1349 | { |
1350 | struct dasd_device *device; | |
1351 | unsigned long flags; | |
1352 | ||
8e09f215 | 1353 | device = cqr->startdev; |
1da177e4 | 1354 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1355 | cqr->status = DASD_CQR_QUEUED; |
1356 | list_add(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1357 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1358 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1359 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1360 | } | |
1361 | ||
1362 | /* | |
8e09f215 SW |
1363 | * Queue a request to the tail of the device ccw_queue. |
1364 | * Start the I/O if possible. | |
1da177e4 | 1365 | */ |
8e09f215 | 1366 | void dasd_add_request_tail(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1367 | { |
1368 | struct dasd_device *device; | |
1369 | unsigned long flags; | |
1370 | ||
8e09f215 | 1371 | device = cqr->startdev; |
1da177e4 | 1372 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); |
8e09f215 SW |
1373 | cqr->status = DASD_CQR_QUEUED; |
1374 | list_add_tail(&cqr->devlist, &device->ccw_queue); | |
1da177e4 | 1375 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1376 | dasd_schedule_device_bh(device); |
1da177e4 LT |
1377 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
1378 | } | |
1379 | ||
1380 | /* | |
8e09f215 | 1381 | * Wakeup helper for the 'sleep_on' functions. |
1da177e4 | 1382 | */ |
8e09f215 | 1383 | static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) |
1da177e4 LT |
1384 | { |
1385 | wake_up((wait_queue_head_t *) data); | |
1386 | } | |
1387 | ||
8e09f215 | 1388 | static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1389 | { |
1390 | struct dasd_device *device; | |
1391 | int rc; | |
1392 | ||
8e09f215 | 1393 | device = cqr->startdev; |
1da177e4 | 1394 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
c2ba444d | 1395 | rc = ((cqr->status == DASD_CQR_DONE || |
8e09f215 SW |
1396 | cqr->status == DASD_CQR_NEED_ERP || |
1397 | cqr->status == DASD_CQR_TERMINATED) && | |
1398 | list_empty(&cqr->devlist)); | |
1da177e4 LT |
1399 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1400 | return rc; | |
1401 | } | |
1402 | ||
1403 | /* | |
8e09f215 SW |
1404 | * Queue a request to the tail of the device ccw_queue and wait for |
1405 | * it's completion. | |
1da177e4 | 1406 | */ |
8e09f215 | 1407 | int dasd_sleep_on(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1408 | { |
1409 | wait_queue_head_t wait_q; | |
1410 | struct dasd_device *device; | |
1411 | int rc; | |
138c014d | 1412 | |
8e09f215 | 1413 | device = cqr->startdev; |
138c014d | 1414 | |
1da177e4 LT |
1415 | init_waitqueue_head (&wait_q); |
1416 | cqr->callback = dasd_wakeup_cb; | |
1417 | cqr->callback_data = (void *) &wait_q; | |
8e09f215 | 1418 | dasd_add_request_tail(cqr); |
1da177e4 | 1419 | wait_event(wait_q, _wait_for_wakeup(cqr)); |
138c014d | 1420 | |
1da177e4 | 1421 | /* Request status is either done or failed. */ |
8e09f215 | 1422 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1423 | return rc; |
1424 | } | |
1425 | ||
1426 | /* | |
8e09f215 SW |
1427 | * Queue a request to the tail of the device ccw_queue and wait |
1428 | * interruptible for it's completion. | |
1da177e4 | 1429 | */ |
8e09f215 | 1430 | int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1431 | { |
1432 | wait_queue_head_t wait_q; | |
1433 | struct dasd_device *device; | |
8e09f215 | 1434 | int rc; |
1da177e4 | 1435 | |
8e09f215 | 1436 | device = cqr->startdev; |
1da177e4 LT |
1437 | init_waitqueue_head (&wait_q); |
1438 | cqr->callback = dasd_wakeup_cb; | |
1439 | cqr->callback_data = (void *) &wait_q; | |
8e09f215 SW |
1440 | dasd_add_request_tail(cqr); |
1441 | rc = wait_event_interruptible(wait_q, _wait_for_wakeup(cqr)); | |
1442 | if (rc == -ERESTARTSYS) { | |
1443 | dasd_cancel_req(cqr); | |
1444 | /* wait (non-interruptible) for final status */ | |
1445 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
1da177e4 | 1446 | } |
8e09f215 | 1447 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1448 | return rc; |
1449 | } | |
1450 | ||
1451 | /* | |
1452 | * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock | |
1453 | * for eckd devices) the currently running request has to be terminated | |
1454 | * and be put back to status queued, before the special request is added | |
1455 | * to the head of the queue. Then the special request is waited on normally. | |
1456 | */ | |
8e09f215 | 1457 | static inline int _dasd_term_running_cqr(struct dasd_device *device) |
1da177e4 LT |
1458 | { |
1459 | struct dasd_ccw_req *cqr; | |
1da177e4 LT |
1460 | |
1461 | if (list_empty(&device->ccw_queue)) | |
1462 | return 0; | |
8e09f215 | 1463 | cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); |
8f61701b | 1464 | return device->discipline->term_IO(cqr); |
1da177e4 LT |
1465 | } |
1466 | ||
8e09f215 | 1467 | int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) |
1da177e4 LT |
1468 | { |
1469 | wait_queue_head_t wait_q; | |
1470 | struct dasd_device *device; | |
1471 | int rc; | |
138c014d | 1472 | |
8e09f215 | 1473 | device = cqr->startdev; |
1da177e4 LT |
1474 | spin_lock_irq(get_ccwdev_lock(device->cdev)); |
1475 | rc = _dasd_term_running_cqr(device); | |
1476 | if (rc) { | |
1477 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); | |
1478 | return rc; | |
1479 | } | |
138c014d | 1480 | |
1da177e4 LT |
1481 | init_waitqueue_head (&wait_q); |
1482 | cqr->callback = dasd_wakeup_cb; | |
1483 | cqr->callback_data = (void *) &wait_q; | |
1484 | cqr->status = DASD_CQR_QUEUED; | |
8e09f215 | 1485 | list_add(&cqr->devlist, &device->ccw_queue); |
138c014d | 1486 | |
1da177e4 | 1487 | /* let the bh start the request to keep them in order */ |
8e09f215 | 1488 | dasd_schedule_device_bh(device); |
138c014d | 1489 | |
1da177e4 LT |
1490 | spin_unlock_irq(get_ccwdev_lock(device->cdev)); |
1491 | ||
1492 | wait_event(wait_q, _wait_for_wakeup(cqr)); | |
138c014d | 1493 | |
1da177e4 | 1494 | /* Request status is either done or failed. */ |
8e09f215 | 1495 | rc = (cqr->status == DASD_CQR_DONE) ? 0 : -EIO; |
1da177e4 LT |
1496 | return rc; |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * Cancels a request that was started with dasd_sleep_on_req. | |
1501 | * This is useful to timeout requests. The request will be | |
1502 | * terminated if it is currently in i/o. | |
1503 | * Returns 1 if the request has been terminated. | |
8e09f215 SW |
1504 | * 0 if there was no need to terminate the request (not started yet) |
1505 | * negative error code if termination failed | |
1506 | * Cancellation of a request is an asynchronous operation! The calling | |
1507 | * function has to wait until the request is properly returned via callback. | |
1da177e4 | 1508 | */ |
8e09f215 | 1509 | int dasd_cancel_req(struct dasd_ccw_req *cqr) |
1da177e4 | 1510 | { |
8e09f215 | 1511 | struct dasd_device *device = cqr->startdev; |
1da177e4 LT |
1512 | unsigned long flags; |
1513 | int rc; | |
1514 | ||
1515 | rc = 0; | |
1516 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
1517 | switch (cqr->status) { | |
1518 | case DASD_CQR_QUEUED: | |
8e09f215 SW |
1519 | /* request was not started - just set to cleared */ |
1520 | cqr->status = DASD_CQR_CLEARED; | |
1da177e4 LT |
1521 | break; |
1522 | case DASD_CQR_IN_IO: | |
1523 | /* request in IO - terminate IO and release again */ | |
8e09f215 SW |
1524 | rc = device->discipline->term_IO(cqr); |
1525 | if (rc) { | |
1526 | DEV_MESSAGE(KERN_ERR, device, | |
1527 | "dasd_cancel_req is unable " | |
1528 | " to terminate request %p, rc = %d", | |
1529 | cqr, rc); | |
1530 | } else { | |
1531 | cqr->stopclk = get_clock(); | |
1532 | rc = 1; | |
1533 | } | |
1da177e4 | 1534 | break; |
8e09f215 | 1535 | default: /* already finished or clear pending - do nothing */ |
1da177e4 | 1536 | break; |
8e09f215 SW |
1537 | } |
1538 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
1539 | dasd_schedule_device_bh(device); | |
1540 | return rc; | |
1541 | } | |
1542 | ||
1543 | ||
1544 | /* | |
1545 | * SECTION: Operations of the dasd_block layer. | |
1546 | */ | |
1547 | ||
1548 | /* | |
1549 | * Timeout function for dasd_block. This is used when the block layer | |
1550 | * is waiting for something that may not come reliably, (e.g. a state | |
1551 | * change interrupt) | |
1552 | */ | |
1553 | static void dasd_block_timeout(unsigned long ptr) | |
1554 | { | |
1555 | unsigned long flags; | |
1556 | struct dasd_block *block; | |
1557 | ||
1558 | block = (struct dasd_block *) ptr; | |
1559 | spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); | |
1560 | /* re-activate request queue */ | |
1561 | block->base->stopped &= ~DASD_STOPPED_PENDING; | |
1562 | spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); | |
1563 | dasd_schedule_block_bh(block); | |
1564 | } | |
1565 | ||
1566 | /* | |
1567 | * Setup timeout for a dasd_block in jiffies. | |
1568 | */ | |
1569 | void dasd_block_set_timer(struct dasd_block *block, int expires) | |
1570 | { | |
1571 | if (expires == 0) { | |
1572 | if (timer_pending(&block->timer)) | |
1573 | del_timer(&block->timer); | |
1574 | return; | |
1575 | } | |
1576 | if (timer_pending(&block->timer)) { | |
1577 | if (mod_timer(&block->timer, jiffies + expires)) | |
1578 | return; | |
1579 | } | |
1580 | block->timer.function = dasd_block_timeout; | |
1581 | block->timer.data = (unsigned long) block; | |
1582 | block->timer.expires = jiffies + expires; | |
1583 | add_timer(&block->timer); | |
1584 | } | |
1585 | ||
1586 | /* | |
1587 | * Clear timeout for a dasd_block. | |
1588 | */ | |
1589 | void dasd_block_clear_timer(struct dasd_block *block) | |
1590 | { | |
1591 | if (timer_pending(&block->timer)) | |
1592 | del_timer(&block->timer); | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * posts the buffer_cache about a finalized request | |
1597 | */ | |
1598 | static inline void dasd_end_request(struct request *req, int uptodate) | |
1599 | { | |
1600 | if (end_that_request_first(req, uptodate, req->hard_nr_sectors)) | |
1da177e4 | 1601 | BUG(); |
8e09f215 SW |
1602 | add_disk_randomness(req->rq_disk); |
1603 | end_that_request_last(req, uptodate); | |
1604 | } | |
1605 | ||
1606 | /* | |
1607 | * Process finished error recovery ccw. | |
1608 | */ | |
1609 | static inline void __dasd_block_process_erp(struct dasd_block *block, | |
1610 | struct dasd_ccw_req *cqr) | |
1611 | { | |
1612 | dasd_erp_fn_t erp_fn; | |
1613 | struct dasd_device *device = block->base; | |
1614 | ||
1615 | if (cqr->status == DASD_CQR_DONE) | |
1616 | DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); | |
1617 | else | |
1618 | DEV_MESSAGE(KERN_ERR, device, "%s", "ERP unsuccessful"); | |
1619 | erp_fn = device->discipline->erp_postaction(cqr); | |
1620 | erp_fn(cqr); | |
1621 | } | |
1da177e4 | 1622 | |
8e09f215 SW |
1623 | /* |
1624 | * Fetch requests from the block device queue. | |
1625 | */ | |
1626 | static void __dasd_process_request_queue(struct dasd_block *block) | |
1627 | { | |
1628 | struct request_queue *queue; | |
1629 | struct request *req; | |
1630 | struct dasd_ccw_req *cqr; | |
1631 | struct dasd_device *basedev; | |
1632 | unsigned long flags; | |
1633 | queue = block->request_queue; | |
1634 | basedev = block->base; | |
1635 | /* No queue ? Then there is nothing to do. */ | |
1636 | if (queue == NULL) | |
1637 | return; | |
1638 | ||
1639 | /* | |
1640 | * We requeue request from the block device queue to the ccw | |
1641 | * queue only in two states. In state DASD_STATE_READY the | |
1642 | * partition detection is done and we need to requeue requests | |
1643 | * for that. State DASD_STATE_ONLINE is normal block device | |
1644 | * operation. | |
1645 | */ | |
1646 | if (basedev->state < DASD_STATE_READY) | |
1647 | return; | |
1648 | /* Now we try to fetch requests from the request queue */ | |
1649 | while (!blk_queue_plugged(queue) && | |
1650 | elv_next_request(queue)) { | |
1651 | ||
1652 | req = elv_next_request(queue); | |
1653 | ||
1654 | if (basedev->features & DASD_FEATURE_READONLY && | |
1655 | rq_data_dir(req) == WRITE) { | |
1656 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1657 | "Rejecting write request %p", | |
1658 | req); | |
1659 | blkdev_dequeue_request(req); | |
1660 | dasd_end_request(req, 0); | |
1661 | continue; | |
1662 | } | |
1663 | cqr = basedev->discipline->build_cp(basedev, block, req); | |
1664 | if (IS_ERR(cqr)) { | |
1665 | if (PTR_ERR(cqr) == -EBUSY) | |
1666 | break; /* normal end condition */ | |
1667 | if (PTR_ERR(cqr) == -ENOMEM) | |
1668 | break; /* terminate request queue loop */ | |
1669 | if (PTR_ERR(cqr) == -EAGAIN) { | |
1670 | /* | |
1671 | * The current request cannot be build right | |
1672 | * now, we have to try later. If this request | |
1673 | * is the head-of-queue we stop the device | |
1674 | * for 1/2 second. | |
1675 | */ | |
1676 | if (!list_empty(&block->ccw_queue)) | |
1677 | break; | |
1678 | spin_lock_irqsave(get_ccwdev_lock(basedev->cdev), flags); | |
1679 | basedev->stopped |= DASD_STOPPED_PENDING; | |
1680 | spin_unlock_irqrestore(get_ccwdev_lock(basedev->cdev), flags); | |
1681 | dasd_block_set_timer(block, HZ/2); | |
1682 | break; | |
1683 | } | |
1684 | DBF_DEV_EVENT(DBF_ERR, basedev, | |
1685 | "CCW creation failed (rc=%ld) " | |
1686 | "on request %p", | |
1687 | PTR_ERR(cqr), req); | |
1688 | blkdev_dequeue_request(req); | |
1689 | dasd_end_request(req, 0); | |
1690 | continue; | |
1691 | } | |
1692 | /* | |
1693 | * Note: callback is set to dasd_return_cqr_cb in | |
1694 | * __dasd_block_start_head to cover erp requests as well | |
1695 | */ | |
1696 | cqr->callback_data = (void *) req; | |
1697 | cqr->status = DASD_CQR_FILLED; | |
1698 | blkdev_dequeue_request(req); | |
1699 | list_add_tail(&cqr->blocklist, &block->ccw_queue); | |
1700 | dasd_profile_start(block, cqr, req); | |
1701 | } | |
1702 | } | |
1703 | ||
1704 | static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) | |
1705 | { | |
1706 | struct request *req; | |
1707 | int status; | |
1708 | ||
1709 | req = (struct request *) cqr->callback_data; | |
1710 | dasd_profile_end(cqr->block, cqr, req); | |
1711 | status = cqr->memdev->discipline->free_cp(cqr, req); | |
1712 | dasd_end_request(req, status); | |
1713 | } | |
1714 | ||
1715 | /* | |
1716 | * Process ccw request queue. | |
1717 | */ | |
1718 | static void __dasd_process_block_ccw_queue(struct dasd_block *block, | |
1719 | struct list_head *final_queue) | |
1720 | { | |
1721 | struct list_head *l, *n; | |
1722 | struct dasd_ccw_req *cqr; | |
1723 | dasd_erp_fn_t erp_fn; | |
1724 | unsigned long flags; | |
1725 | struct dasd_device *base = block->base; | |
1726 | ||
1727 | restart: | |
1728 | /* Process request with final status. */ | |
1729 | list_for_each_safe(l, n, &block->ccw_queue) { | |
1730 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1731 | if (cqr->status != DASD_CQR_DONE && | |
1732 | cqr->status != DASD_CQR_FAILED && | |
1733 | cqr->status != DASD_CQR_NEED_ERP && | |
1734 | cqr->status != DASD_CQR_TERMINATED) | |
1735 | continue; | |
1736 | ||
1737 | if (cqr->status == DASD_CQR_TERMINATED) { | |
1738 | base->discipline->handle_terminated_request(cqr); | |
1739 | goto restart; | |
1740 | } | |
1741 | ||
1742 | /* Process requests that may be recovered */ | |
1743 | if (cqr->status == DASD_CQR_NEED_ERP) { | |
1744 | if (cqr->irb.esw.esw0.erw.cons && | |
1745 | test_bit(DASD_CQR_FLAGS_USE_ERP, | |
1746 | &cqr->flags)) { | |
1747 | erp_fn = base->discipline->erp_action(cqr); | |
1748 | erp_fn(cqr); | |
1749 | } | |
1750 | goto restart; | |
1751 | } | |
1752 | ||
1753 | /* First of all call extended error reporting. */ | |
1754 | if (dasd_eer_enabled(base) && | |
1755 | cqr->status == DASD_CQR_FAILED) { | |
1756 | dasd_eer_write(base, cqr, DASD_EER_FATALERROR); | |
1757 | ||
1758 | /* restart request */ | |
1759 | cqr->status = DASD_CQR_FILLED; | |
1760 | cqr->retries = 255; | |
1761 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); | |
1762 | base->stopped |= DASD_STOPPED_QUIESCE; | |
1763 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), | |
1764 | flags); | |
1765 | goto restart; | |
1766 | } | |
1767 | ||
1768 | /* Process finished ERP request. */ | |
1769 | if (cqr->refers) { | |
1770 | __dasd_block_process_erp(block, cqr); | |
1771 | goto restart; | |
1772 | } | |
1773 | ||
1774 | /* Rechain finished requests to final queue */ | |
1775 | cqr->endclk = get_clock(); | |
1776 | list_move_tail(&cqr->blocklist, final_queue); | |
1777 | } | |
1778 | } | |
1779 | ||
1780 | static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) | |
1781 | { | |
1782 | dasd_schedule_block_bh(cqr->block); | |
1783 | } | |
1784 | ||
1785 | static void __dasd_block_start_head(struct dasd_block *block) | |
1786 | { | |
1787 | struct dasd_ccw_req *cqr; | |
1788 | ||
1789 | if (list_empty(&block->ccw_queue)) | |
1790 | return; | |
1791 | /* We allways begin with the first requests on the queue, as some | |
1792 | * of previously started requests have to be enqueued on a | |
1793 | * dasd_device again for error recovery. | |
1794 | */ | |
1795 | list_for_each_entry(cqr, &block->ccw_queue, blocklist) { | |
1796 | if (cqr->status != DASD_CQR_FILLED) | |
1797 | continue; | |
1798 | /* Non-temporary stop condition will trigger fail fast */ | |
1799 | if (block->base->stopped & ~DASD_STOPPED_PENDING && | |
1800 | test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && | |
1801 | (!dasd_eer_enabled(block->base))) { | |
1802 | cqr->status = DASD_CQR_FAILED; | |
1803 | dasd_schedule_block_bh(block); | |
1804 | continue; | |
1805 | } | |
1806 | /* Don't try to start requests if device is stopped */ | |
1807 | if (block->base->stopped) | |
1808 | return; | |
1809 | ||
1810 | /* just a fail safe check, should not happen */ | |
1811 | if (!cqr->startdev) | |
1812 | cqr->startdev = block->base; | |
1813 | ||
1814 | /* make sure that the requests we submit find their way back */ | |
1815 | cqr->callback = dasd_return_cqr_cb; | |
1816 | ||
1817 | dasd_add_request_tail(cqr); | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | /* | |
1822 | * Central dasd_block layer routine. Takes requests from the generic | |
1823 | * block layer request queue, creates ccw requests, enqueues them on | |
1824 | * a dasd_device and processes ccw requests that have been returned. | |
1825 | */ | |
1826 | static void dasd_block_tasklet(struct dasd_block *block) | |
1827 | { | |
1828 | struct list_head final_queue; | |
1829 | struct list_head *l, *n; | |
1830 | struct dasd_ccw_req *cqr; | |
1831 | ||
1832 | atomic_set(&block->tasklet_scheduled, 0); | |
1833 | INIT_LIST_HEAD(&final_queue); | |
1834 | spin_lock(&block->queue_lock); | |
1835 | /* Finish off requests on ccw queue */ | |
1836 | __dasd_process_block_ccw_queue(block, &final_queue); | |
1837 | spin_unlock(&block->queue_lock); | |
1838 | /* Now call the callback function of requests with final status */ | |
1839 | spin_lock_irq(&block->request_queue_lock); | |
1840 | list_for_each_safe(l, n, &final_queue) { | |
1841 | cqr = list_entry(l, struct dasd_ccw_req, blocklist); | |
1842 | list_del_init(&cqr->blocklist); | |
1843 | __dasd_cleanup_cqr(cqr); | |
1844 | } | |
1845 | spin_lock(&block->queue_lock); | |
1846 | /* Get new request from the block device request queue */ | |
1847 | __dasd_process_request_queue(block); | |
1848 | /* Now check if the head of the ccw queue needs to be started. */ | |
1849 | __dasd_block_start_head(block); | |
1850 | spin_unlock(&block->queue_lock); | |
1851 | spin_unlock_irq(&block->request_queue_lock); | |
1852 | dasd_put_device(block->base); | |
1853 | } | |
1854 | ||
1855 | static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) | |
1856 | { | |
1857 | wake_up(&dasd_flush_wq); | |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * Go through all request on the dasd_block request queue, cancel them | |
1862 | * on the respective dasd_device, and return them to the generic | |
1863 | * block layer. | |
1864 | */ | |
1865 | static int dasd_flush_block_queue(struct dasd_block *block) | |
1866 | { | |
1867 | struct dasd_ccw_req *cqr, *n; | |
1868 | int rc, i; | |
1869 | struct list_head flush_queue; | |
1870 | ||
1871 | INIT_LIST_HEAD(&flush_queue); | |
1872 | spin_lock_bh(&block->queue_lock); | |
1873 | rc = 0; | |
1874 | restart: | |
1875 | list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { | |
1876 | /* if this request currently owned by a dasd_device cancel it */ | |
1877 | if (cqr->status >= DASD_CQR_QUEUED) | |
1878 | rc = dasd_cancel_req(cqr); | |
1879 | if (rc < 0) | |
1880 | break; | |
1881 | /* Rechain request (including erp chain) so it won't be | |
1882 | * touched by the dasd_block_tasklet anymore. | |
1883 | * Replace the callback so we notice when the request | |
1884 | * is returned from the dasd_device layer. | |
1885 | */ | |
1886 | cqr->callback = _dasd_wake_block_flush_cb; | |
1887 | for (i = 0; cqr != NULL; cqr = cqr->refers, i++) | |
1888 | list_move_tail(&cqr->blocklist, &flush_queue); | |
1889 | if (i > 1) | |
1890 | /* moved more than one request - need to restart */ | |
1891 | goto restart; | |
1892 | } | |
1893 | spin_unlock_bh(&block->queue_lock); | |
1894 | /* Now call the callback function of flushed requests */ | |
1895 | restart_cb: | |
1896 | list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { | |
1897 | wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); | |
1898 | /* Process finished ERP request. */ | |
1899 | if (cqr->refers) { | |
1900 | __dasd_block_process_erp(block, cqr); | |
1901 | /* restart list_for_xx loop since dasd_process_erp | |
1902 | * might remove multiple elements */ | |
1903 | goto restart_cb; | |
1904 | } | |
1905 | /* call the callback function */ | |
1906 | cqr->endclk = get_clock(); | |
1907 | list_del_init(&cqr->blocklist); | |
1908 | __dasd_cleanup_cqr(cqr); | |
1da177e4 | 1909 | } |
1da177e4 LT |
1910 | return rc; |
1911 | } | |
1912 | ||
1913 | /* | |
8e09f215 SW |
1914 | * Schedules a call to dasd_tasklet over the device tasklet. |
1915 | */ | |
1916 | void dasd_schedule_block_bh(struct dasd_block *block) | |
1917 | { | |
1918 | /* Protect against rescheduling. */ | |
1919 | if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) | |
1920 | return; | |
1921 | /* life cycle of block is bound to it's base device */ | |
1922 | dasd_get_device(block->base); | |
1923 | tasklet_hi_schedule(&block->tasklet); | |
1924 | } | |
1925 | ||
1926 | ||
1927 | /* | |
1928 | * SECTION: external block device operations | |
1929 | * (request queue handling, open, release, etc.) | |
1da177e4 LT |
1930 | */ |
1931 | ||
1932 | /* | |
1933 | * Dasd request queue function. Called from ll_rw_blk.c | |
1934 | */ | |
8e09f215 | 1935 | static void do_dasd_request(struct request_queue *queue) |
1da177e4 | 1936 | { |
8e09f215 | 1937 | struct dasd_block *block; |
1da177e4 | 1938 | |
8e09f215 SW |
1939 | block = queue->queuedata; |
1940 | spin_lock(&block->queue_lock); | |
1da177e4 | 1941 | /* Get new request from the block device request queue */ |
8e09f215 | 1942 | __dasd_process_request_queue(block); |
1da177e4 | 1943 | /* Now check if the head of the ccw queue needs to be started. */ |
8e09f215 SW |
1944 | __dasd_block_start_head(block); |
1945 | spin_unlock(&block->queue_lock); | |
1da177e4 LT |
1946 | } |
1947 | ||
1948 | /* | |
1949 | * Allocate and initialize request queue and default I/O scheduler. | |
1950 | */ | |
8e09f215 | 1951 | static int dasd_alloc_queue(struct dasd_block *block) |
1da177e4 LT |
1952 | { |
1953 | int rc; | |
1954 | ||
8e09f215 SW |
1955 | block->request_queue = blk_init_queue(do_dasd_request, |
1956 | &block->request_queue_lock); | |
1957 | if (block->request_queue == NULL) | |
1da177e4 LT |
1958 | return -ENOMEM; |
1959 | ||
8e09f215 | 1960 | block->request_queue->queuedata = block; |
1da177e4 | 1961 | |
8e09f215 SW |
1962 | elevator_exit(block->request_queue->elevator); |
1963 | rc = elevator_init(block->request_queue, "deadline"); | |
1da177e4 | 1964 | if (rc) { |
8e09f215 | 1965 | blk_cleanup_queue(block->request_queue); |
1da177e4 LT |
1966 | return rc; |
1967 | } | |
1968 | return 0; | |
1969 | } | |
1970 | ||
1971 | /* | |
1972 | * Allocate and initialize request queue. | |
1973 | */ | |
8e09f215 | 1974 | static void dasd_setup_queue(struct dasd_block *block) |
1da177e4 LT |
1975 | { |
1976 | int max; | |
1977 | ||
8e09f215 SW |
1978 | blk_queue_hardsect_size(block->request_queue, block->bp_block); |
1979 | max = block->base->discipline->max_blocks << block->s2b_shift; | |
1980 | blk_queue_max_sectors(block->request_queue, max); | |
1981 | blk_queue_max_phys_segments(block->request_queue, -1L); | |
1982 | blk_queue_max_hw_segments(block->request_queue, -1L); | |
1983 | blk_queue_max_segment_size(block->request_queue, -1L); | |
1984 | blk_queue_segment_boundary(block->request_queue, -1L); | |
1985 | blk_queue_ordered(block->request_queue, QUEUE_ORDERED_DRAIN, NULL); | |
1da177e4 LT |
1986 | } |
1987 | ||
1988 | /* | |
1989 | * Deactivate and free request queue. | |
1990 | */ | |
8e09f215 | 1991 | static void dasd_free_queue(struct dasd_block *block) |
1da177e4 | 1992 | { |
8e09f215 SW |
1993 | if (block->request_queue) { |
1994 | blk_cleanup_queue(block->request_queue); | |
1995 | block->request_queue = NULL; | |
1da177e4 LT |
1996 | } |
1997 | } | |
1998 | ||
1999 | /* | |
2000 | * Flush request on the request queue. | |
2001 | */ | |
8e09f215 | 2002 | static void dasd_flush_request_queue(struct dasd_block *block) |
1da177e4 LT |
2003 | { |
2004 | struct request *req; | |
2005 | ||
8e09f215 | 2006 | if (!block->request_queue) |
1da177e4 | 2007 | return; |
138c014d | 2008 | |
8e09f215 SW |
2009 | spin_lock_irq(&block->request_queue_lock); |
2010 | while ((req = elv_next_request(block->request_queue))) { | |
1da177e4 | 2011 | blkdev_dequeue_request(req); |
ebc45999 | 2012 | dasd_end_request(req, 0); |
1da177e4 | 2013 | } |
8e09f215 | 2014 | spin_unlock_irq(&block->request_queue_lock); |
1da177e4 LT |
2015 | } |
2016 | ||
8e09f215 | 2017 | static int dasd_open(struct inode *inp, struct file *filp) |
1da177e4 LT |
2018 | { |
2019 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
8e09f215 SW |
2020 | struct dasd_block *block = disk->private_data; |
2021 | struct dasd_device *base = block->base; | |
1da177e4 LT |
2022 | int rc; |
2023 | ||
8e09f215 SW |
2024 | atomic_inc(&block->open_count); |
2025 | if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { | |
1da177e4 LT |
2026 | rc = -ENODEV; |
2027 | goto unlock; | |
2028 | } | |
2029 | ||
8e09f215 | 2030 | if (!try_module_get(base->discipline->owner)) { |
1da177e4 LT |
2031 | rc = -EINVAL; |
2032 | goto unlock; | |
2033 | } | |
2034 | ||
2035 | if (dasd_probeonly) { | |
8e09f215 | 2036 | DEV_MESSAGE(KERN_INFO, base, "%s", |
1da177e4 LT |
2037 | "No access to device due to probeonly mode"); |
2038 | rc = -EPERM; | |
2039 | goto out; | |
2040 | } | |
2041 | ||
8e09f215 SW |
2042 | if (base->state <= DASD_STATE_BASIC) { |
2043 | DBF_DEV_EVENT(DBF_ERR, base, " %s", | |
1da177e4 LT |
2044 | " Cannot open unrecognized device"); |
2045 | rc = -ENODEV; | |
2046 | goto out; | |
2047 | } | |
2048 | ||
2049 | return 0; | |
2050 | ||
2051 | out: | |
8e09f215 | 2052 | module_put(base->discipline->owner); |
1da177e4 | 2053 | unlock: |
8e09f215 | 2054 | atomic_dec(&block->open_count); |
1da177e4 LT |
2055 | return rc; |
2056 | } | |
2057 | ||
8e09f215 | 2058 | static int dasd_release(struct inode *inp, struct file *filp) |
1da177e4 LT |
2059 | { |
2060 | struct gendisk *disk = inp->i_bdev->bd_disk; | |
8e09f215 | 2061 | struct dasd_block *block = disk->private_data; |
1da177e4 | 2062 | |
8e09f215 SW |
2063 | atomic_dec(&block->open_count); |
2064 | module_put(block->base->discipline->owner); | |
1da177e4 LT |
2065 | return 0; |
2066 | } | |
2067 | ||
a885c8c4 CH |
2068 | /* |
2069 | * Return disk geometry. | |
2070 | */ | |
8e09f215 | 2071 | static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
a885c8c4 | 2072 | { |
8e09f215 SW |
2073 | struct dasd_block *block; |
2074 | struct dasd_device *base; | |
a885c8c4 | 2075 | |
8e09f215 SW |
2076 | block = bdev->bd_disk->private_data; |
2077 | base = block->base; | |
2078 | if (!block) | |
a885c8c4 CH |
2079 | return -ENODEV; |
2080 | ||
8e09f215 SW |
2081 | if (!base->discipline || |
2082 | !base->discipline->fill_geometry) | |
a885c8c4 CH |
2083 | return -EINVAL; |
2084 | ||
8e09f215 SW |
2085 | base->discipline->fill_geometry(block, geo); |
2086 | geo->start = get_start_sect(bdev) >> block->s2b_shift; | |
a885c8c4 CH |
2087 | return 0; |
2088 | } | |
2089 | ||
1da177e4 LT |
2090 | struct block_device_operations |
2091 | dasd_device_operations = { | |
2092 | .owner = THIS_MODULE, | |
2093 | .open = dasd_open, | |
2094 | .release = dasd_release, | |
2095 | .ioctl = dasd_ioctl, | |
8262037f | 2096 | .compat_ioctl = dasd_compat_ioctl, |
a885c8c4 | 2097 | .getgeo = dasd_getgeo, |
1da177e4 LT |
2098 | }; |
2099 | ||
8e09f215 SW |
2100 | /******************************************************************************* |
2101 | * end of block device operations | |
2102 | */ | |
1da177e4 LT |
2103 | |
2104 | static void | |
2105 | dasd_exit(void) | |
2106 | { | |
2107 | #ifdef CONFIG_PROC_FS | |
2108 | dasd_proc_exit(); | |
2109 | #endif | |
20c64468 | 2110 | dasd_eer_exit(); |
6bb0e010 HH |
2111 | if (dasd_page_cache != NULL) { |
2112 | kmem_cache_destroy(dasd_page_cache); | |
2113 | dasd_page_cache = NULL; | |
2114 | } | |
1da177e4 LT |
2115 | dasd_gendisk_exit(); |
2116 | dasd_devmap_exit(); | |
1da177e4 LT |
2117 | if (dasd_debug_area != NULL) { |
2118 | debug_unregister(dasd_debug_area); | |
2119 | dasd_debug_area = NULL; | |
2120 | } | |
2121 | } | |
2122 | ||
2123 | /* | |
2124 | * SECTION: common functions for ccw_driver use | |
2125 | */ | |
2126 | ||
1c01b8a5 HH |
2127 | /* |
2128 | * Initial attempt at a probe function. this can be simplified once | |
2129 | * the other detection code is gone. | |
2130 | */ | |
8e09f215 SW |
2131 | int dasd_generic_probe(struct ccw_device *cdev, |
2132 | struct dasd_discipline *discipline) | |
1da177e4 LT |
2133 | { |
2134 | int ret; | |
2135 | ||
40545573 HH |
2136 | ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP); |
2137 | if (ret) { | |
2138 | printk(KERN_WARNING | |
2139 | "dasd_generic_probe: could not set ccw-device options " | |
2140 | "for %s\n", cdev->dev.bus_id); | |
2141 | return ret; | |
2142 | } | |
1da177e4 LT |
2143 | ret = dasd_add_sysfs_files(cdev); |
2144 | if (ret) { | |
2145 | printk(KERN_WARNING | |
2146 | "dasd_generic_probe: could not add sysfs entries " | |
2147 | "for %s\n", cdev->dev.bus_id); | |
40545573 | 2148 | return ret; |
1da177e4 | 2149 | } |
40545573 | 2150 | cdev->handler = &dasd_int_handler; |
1da177e4 | 2151 | |
40545573 HH |
2152 | /* |
2153 | * Automatically online either all dasd devices (dasd_autodetect) | |
2154 | * or all devices specified with dasd= parameters during | |
2155 | * initial probe. | |
2156 | */ | |
2157 | if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || | |
2158 | (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0)) | |
2159 | ret = ccw_device_set_online(cdev); | |
2160 | if (ret) | |
2161 | printk(KERN_WARNING | |
de3e0da1 SH |
2162 | "dasd_generic_probe: could not initially " |
2163 | "online ccw-device %s; return code: %d\n", | |
2164 | cdev->dev.bus_id, ret); | |
2165 | return 0; | |
1da177e4 LT |
2166 | } |
2167 | ||
1c01b8a5 HH |
2168 | /* |
2169 | * This will one day be called from a global not_oper handler. | |
2170 | * It is also used by driver_unregister during module unload. | |
2171 | */ | |
8e09f215 | 2172 | void dasd_generic_remove(struct ccw_device *cdev) |
1da177e4 LT |
2173 | { |
2174 | struct dasd_device *device; | |
8e09f215 | 2175 | struct dasd_block *block; |
1da177e4 | 2176 | |
59afda78 HH |
2177 | cdev->handler = NULL; |
2178 | ||
1da177e4 LT |
2179 | dasd_remove_sysfs_files(cdev); |
2180 | device = dasd_device_from_cdev(cdev); | |
2181 | if (IS_ERR(device)) | |
2182 | return; | |
2183 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2184 | /* Already doing offline processing */ | |
2185 | dasd_put_device(device); | |
2186 | return; | |
2187 | } | |
2188 | /* | |
2189 | * This device is removed unconditionally. Set offline | |
2190 | * flag to prevent dasd_open from opening it while it is | |
2191 | * no quite down yet. | |
2192 | */ | |
2193 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2194 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2195 | block = device->block; |
2196 | device->block = NULL; | |
1da177e4 | 2197 | dasd_delete_device(device); |
8e09f215 SW |
2198 | /* |
2199 | * life cycle of block is bound to device, so delete it after | |
2200 | * device was safely removed | |
2201 | */ | |
2202 | if (block) | |
2203 | dasd_free_block(block); | |
1da177e4 LT |
2204 | } |
2205 | ||
1c01b8a5 HH |
2206 | /* |
2207 | * Activate a device. This is called from dasd_{eckd,fba}_probe() when either | |
1da177e4 | 2208 | * the device is detected for the first time and is supposed to be used |
1c01b8a5 HH |
2209 | * or the user has started activation through sysfs. |
2210 | */ | |
8e09f215 SW |
2211 | int dasd_generic_set_online(struct ccw_device *cdev, |
2212 | struct dasd_discipline *base_discipline) | |
1da177e4 | 2213 | { |
aa88861f | 2214 | struct dasd_discipline *discipline; |
1da177e4 | 2215 | struct dasd_device *device; |
c6eb7b77 | 2216 | int rc; |
f24acd45 | 2217 | |
40545573 HH |
2218 | /* first online clears initial online feature flag */ |
2219 | dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); | |
1da177e4 LT |
2220 | device = dasd_create_device(cdev); |
2221 | if (IS_ERR(device)) | |
2222 | return PTR_ERR(device); | |
2223 | ||
aa88861f | 2224 | discipline = base_discipline; |
c6eb7b77 | 2225 | if (device->features & DASD_FEATURE_USEDIAG) { |
1da177e4 LT |
2226 | if (!dasd_diag_discipline_pointer) { |
2227 | printk (KERN_WARNING | |
2228 | "dasd_generic couldn't online device %s " | |
2229 | "- discipline DIAG not available\n", | |
2230 | cdev->dev.bus_id); | |
2231 | dasd_delete_device(device); | |
2232 | return -ENODEV; | |
2233 | } | |
2234 | discipline = dasd_diag_discipline_pointer; | |
2235 | } | |
aa88861f PO |
2236 | if (!try_module_get(base_discipline->owner)) { |
2237 | dasd_delete_device(device); | |
2238 | return -EINVAL; | |
2239 | } | |
2240 | if (!try_module_get(discipline->owner)) { | |
2241 | module_put(base_discipline->owner); | |
2242 | dasd_delete_device(device); | |
2243 | return -EINVAL; | |
2244 | } | |
2245 | device->base_discipline = base_discipline; | |
1da177e4 LT |
2246 | device->discipline = discipline; |
2247 | ||
8e09f215 | 2248 | /* check_device will allocate block device if necessary */ |
1da177e4 LT |
2249 | rc = discipline->check_device(device); |
2250 | if (rc) { | |
2251 | printk (KERN_WARNING | |
2252 | "dasd_generic couldn't online device %s " | |
2253 | "with discipline %s rc=%i\n", | |
2254 | cdev->dev.bus_id, discipline->name, rc); | |
aa88861f PO |
2255 | module_put(discipline->owner); |
2256 | module_put(base_discipline->owner); | |
1da177e4 LT |
2257 | dasd_delete_device(device); |
2258 | return rc; | |
2259 | } | |
2260 | ||
2261 | dasd_set_target_state(device, DASD_STATE_ONLINE); | |
2262 | if (device->state <= DASD_STATE_KNOWN) { | |
2263 | printk (KERN_WARNING | |
2264 | "dasd_generic discipline not found for %s\n", | |
2265 | cdev->dev.bus_id); | |
2266 | rc = -ENODEV; | |
2267 | dasd_set_target_state(device, DASD_STATE_NEW); | |
8e09f215 SW |
2268 | if (device->block) |
2269 | dasd_free_block(device->block); | |
1da177e4 LT |
2270 | dasd_delete_device(device); |
2271 | } else | |
2272 | pr_debug("dasd_generic device %s found\n", | |
2273 | cdev->dev.bus_id); | |
2274 | ||
2275 | /* FIXME: we have to wait for the root device but we don't want | |
2276 | * to wait for each single device but for all at once. */ | |
2277 | wait_event(dasd_init_waitq, _wait_for_device(device)); | |
2278 | ||
2279 | dasd_put_device(device); | |
2280 | ||
2281 | return rc; | |
2282 | } | |
2283 | ||
8e09f215 | 2284 | int dasd_generic_set_offline(struct ccw_device *cdev) |
1da177e4 LT |
2285 | { |
2286 | struct dasd_device *device; | |
8e09f215 | 2287 | struct dasd_block *block; |
dafd87aa | 2288 | int max_count, open_count; |
1da177e4 LT |
2289 | |
2290 | device = dasd_device_from_cdev(cdev); | |
2291 | if (IS_ERR(device)) | |
2292 | return PTR_ERR(device); | |
2293 | if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { | |
2294 | /* Already doing offline processing */ | |
2295 | dasd_put_device(device); | |
2296 | return 0; | |
2297 | } | |
2298 | /* | |
2299 | * We must make sure that this device is currently not in use. | |
2300 | * The open_count is increased for every opener, that includes | |
2301 | * the blkdev_get in dasd_scan_partitions. We are only interested | |
2302 | * in the other openers. | |
2303 | */ | |
8e09f215 SW |
2304 | if (device->block) { |
2305 | struct dasd_block *block = device->block; | |
2306 | max_count = block->bdev ? 0 : -1; | |
2307 | open_count = (int) atomic_read(&block->open_count); | |
2308 | if (open_count > max_count) { | |
2309 | if (open_count > 0) | |
2310 | printk(KERN_WARNING "Can't offline dasd " | |
2311 | "device with open count = %i.\n", | |
2312 | open_count); | |
2313 | else | |
2314 | printk(KERN_WARNING "%s", | |
2315 | "Can't offline dasd device due " | |
2316 | "to internal use\n"); | |
2317 | clear_bit(DASD_FLAG_OFFLINE, &device->flags); | |
2318 | dasd_put_device(device); | |
2319 | return -EBUSY; | |
2320 | } | |
1da177e4 LT |
2321 | } |
2322 | dasd_set_target_state(device, DASD_STATE_NEW); | |
2323 | /* dasd_delete_device destroys the device reference. */ | |
8e09f215 SW |
2324 | block = device->block; |
2325 | device->block = NULL; | |
1da177e4 | 2326 | dasd_delete_device(device); |
8e09f215 SW |
2327 | /* |
2328 | * life cycle of block is bound to device, so delete it after | |
2329 | * device was safely removed | |
2330 | */ | |
2331 | if (block) | |
2332 | dasd_free_block(block); | |
1da177e4 LT |
2333 | return 0; |
2334 | } | |
2335 | ||
8e09f215 | 2336 | int dasd_generic_notify(struct ccw_device *cdev, int event) |
1da177e4 LT |
2337 | { |
2338 | struct dasd_device *device; | |
2339 | struct dasd_ccw_req *cqr; | |
2340 | unsigned long flags; | |
2341 | int ret; | |
2342 | ||
2343 | device = dasd_device_from_cdev(cdev); | |
2344 | if (IS_ERR(device)) | |
2345 | return 0; | |
2346 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
2347 | ret = 0; | |
2348 | switch (event) { | |
2349 | case CIO_GONE: | |
2350 | case CIO_NO_PATH: | |
20c64468 SW |
2351 | /* First of all call extended error reporting. */ |
2352 | dasd_eer_write(device, NULL, DASD_EER_NOPATH); | |
2353 | ||
1da177e4 LT |
2354 | if (device->state < DASD_STATE_BASIC) |
2355 | break; | |
2356 | /* Device is active. We want to keep it. */ | |
8e09f215 SW |
2357 | list_for_each_entry(cqr, &device->ccw_queue, devlist) |
2358 | if (cqr->status == DASD_CQR_IN_IO) { | |
2359 | cqr->status = DASD_CQR_QUEUED; | |
2360 | cqr->retries++; | |
2361 | } | |
2362 | device->stopped |= DASD_STOPPED_DC_WAIT; | |
2363 | dasd_device_clear_timer(device); | |
2364 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
2365 | ret = 1; |
2366 | break; | |
2367 | case CIO_OPER: | |
2368 | /* FIXME: add a sanity check. */ | |
8e09f215 SW |
2369 | device->stopped &= ~DASD_STOPPED_DC_WAIT; |
2370 | dasd_schedule_device_bh(device); | |
2371 | if (device->block) | |
2372 | dasd_schedule_block_bh(device->block); | |
1da177e4 LT |
2373 | ret = 1; |
2374 | break; | |
2375 | } | |
2376 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
2377 | dasd_put_device(device); | |
2378 | return ret; | |
2379 | } | |
2380 | ||
763968e2 HC |
2381 | static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, |
2382 | void *rdc_buffer, | |
2383 | int rdc_buffer_size, | |
2384 | char *magic) | |
17283b56 CH |
2385 | { |
2386 | struct dasd_ccw_req *cqr; | |
2387 | struct ccw1 *ccw; | |
2388 | ||
2389 | cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); | |
2390 | ||
2391 | if (IS_ERR(cqr)) { | |
2392 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
2393 | "Could not allocate RDC request"); | |
2394 | return cqr; | |
2395 | } | |
2396 | ||
2397 | ccw = cqr->cpaddr; | |
2398 | ccw->cmd_code = CCW_CMD_RDC; | |
2399 | ccw->cda = (__u32)(addr_t)rdc_buffer; | |
2400 | ccw->count = rdc_buffer_size; | |
2401 | ||
8e09f215 SW |
2402 | cqr->startdev = device; |
2403 | cqr->memdev = device; | |
17283b56 CH |
2404 | cqr->expires = 10*HZ; |
2405 | clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); | |
2406 | cqr->retries = 2; | |
2407 | cqr->buildclk = get_clock(); | |
2408 | cqr->status = DASD_CQR_FILLED; | |
2409 | return cqr; | |
2410 | } | |
2411 | ||
2412 | ||
2413 | int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic, | |
2414 | void **rdc_buffer, int rdc_buffer_size) | |
2415 | { | |
2416 | int ret; | |
2417 | struct dasd_ccw_req *cqr; | |
2418 | ||
2419 | cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size, | |
2420 | magic); | |
2421 | if (IS_ERR(cqr)) | |
2422 | return PTR_ERR(cqr); | |
2423 | ||
2424 | ret = dasd_sleep_on(cqr); | |
8e09f215 | 2425 | dasd_sfree_request(cqr, cqr->memdev); |
17283b56 CH |
2426 | return ret; |
2427 | } | |
aaff0f64 | 2428 | EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); |
20c64468 | 2429 | |
8e09f215 | 2430 | static int __init dasd_init(void) |
1da177e4 LT |
2431 | { |
2432 | int rc; | |
2433 | ||
2434 | init_waitqueue_head(&dasd_init_waitq); | |
8f61701b | 2435 | init_waitqueue_head(&dasd_flush_wq); |
1da177e4 LT |
2436 | |
2437 | /* register 'common' DASD debug area, used for all DBF_XXX calls */ | |
361f494d | 2438 | dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); |
1da177e4 LT |
2439 | if (dasd_debug_area == NULL) { |
2440 | rc = -ENOMEM; | |
2441 | goto failed; | |
2442 | } | |
2443 | debug_register_view(dasd_debug_area, &debug_sprintf_view); | |
b0035f12 | 2444 | debug_set_level(dasd_debug_area, DBF_WARNING); |
1da177e4 LT |
2445 | |
2446 | DBF_EVENT(DBF_EMERG, "%s", "debug area created"); | |
2447 | ||
2448 | dasd_diag_discipline_pointer = NULL; | |
2449 | ||
1da177e4 LT |
2450 | rc = dasd_devmap_init(); |
2451 | if (rc) | |
2452 | goto failed; | |
2453 | rc = dasd_gendisk_init(); | |
2454 | if (rc) | |
2455 | goto failed; | |
2456 | rc = dasd_parse(); | |
2457 | if (rc) | |
2458 | goto failed; | |
20c64468 SW |
2459 | rc = dasd_eer_init(); |
2460 | if (rc) | |
2461 | goto failed; | |
1da177e4 LT |
2462 | #ifdef CONFIG_PROC_FS |
2463 | rc = dasd_proc_init(); | |
2464 | if (rc) | |
2465 | goto failed; | |
2466 | #endif | |
2467 | ||
2468 | return 0; | |
2469 | failed: | |
2470 | MESSAGE(KERN_INFO, "%s", "initialization not performed due to errors"); | |
2471 | dasd_exit(); | |
2472 | return rc; | |
2473 | } | |
2474 | ||
2475 | module_init(dasd_init); | |
2476 | module_exit(dasd_exit); | |
2477 | ||
2478 | EXPORT_SYMBOL(dasd_debug_area); | |
2479 | EXPORT_SYMBOL(dasd_diag_discipline_pointer); | |
2480 | ||
2481 | EXPORT_SYMBOL(dasd_add_request_head); | |
2482 | EXPORT_SYMBOL(dasd_add_request_tail); | |
2483 | EXPORT_SYMBOL(dasd_cancel_req); | |
8e09f215 SW |
2484 | EXPORT_SYMBOL(dasd_device_clear_timer); |
2485 | EXPORT_SYMBOL(dasd_block_clear_timer); | |
1da177e4 LT |
2486 | EXPORT_SYMBOL(dasd_enable_device); |
2487 | EXPORT_SYMBOL(dasd_int_handler); | |
2488 | EXPORT_SYMBOL(dasd_kfree_request); | |
2489 | EXPORT_SYMBOL(dasd_kick_device); | |
2490 | EXPORT_SYMBOL(dasd_kmalloc_request); | |
8e09f215 SW |
2491 | EXPORT_SYMBOL(dasd_schedule_device_bh); |
2492 | EXPORT_SYMBOL(dasd_schedule_block_bh); | |
1da177e4 | 2493 | EXPORT_SYMBOL(dasd_set_target_state); |
8e09f215 SW |
2494 | EXPORT_SYMBOL(dasd_device_set_timer); |
2495 | EXPORT_SYMBOL(dasd_block_set_timer); | |
1da177e4 LT |
2496 | EXPORT_SYMBOL(dasd_sfree_request); |
2497 | EXPORT_SYMBOL(dasd_sleep_on); | |
2498 | EXPORT_SYMBOL(dasd_sleep_on_immediatly); | |
2499 | EXPORT_SYMBOL(dasd_sleep_on_interruptible); | |
2500 | EXPORT_SYMBOL(dasd_smalloc_request); | |
2501 | EXPORT_SYMBOL(dasd_start_IO); | |
2502 | EXPORT_SYMBOL(dasd_term_IO); | |
2503 | ||
2504 | EXPORT_SYMBOL_GPL(dasd_generic_probe); | |
2505 | EXPORT_SYMBOL_GPL(dasd_generic_remove); | |
2506 | EXPORT_SYMBOL_GPL(dasd_generic_notify); | |
2507 | EXPORT_SYMBOL_GPL(dasd_generic_set_online); | |
2508 | EXPORT_SYMBOL_GPL(dasd_generic_set_offline); | |
8e09f215 SW |
2509 | EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); |
2510 | EXPORT_SYMBOL_GPL(dasd_flush_device_queue); | |
2511 | EXPORT_SYMBOL_GPL(dasd_alloc_block); | |
2512 | EXPORT_SYMBOL_GPL(dasd_free_block); |