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1da177e4 LT |
1 | /* |
2 | * Block OSM | |
3 | * | |
4 | * Copyright (C) 1999-2002 Red Hat Software | |
5 | * | |
6 | * Written by Alan Cox, Building Number Three Ltd | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * For the purpose of avoiding doubt the preferred form of the work | |
19 | * for making modifications shall be a standards compliant form such | |
20 | * gzipped tar and not one requiring a proprietary or patent encumbered | |
21 | * tool to unpack. | |
22 | * | |
23 | * Fixes/additions: | |
24 | * Steve Ralston: | |
25 | * Multiple device handling error fixes, | |
26 | * Added a queue depth. | |
27 | * Alan Cox: | |
28 | * FC920 has an rmw bug. Dont or in the end marker. | |
29 | * Removed queue walk, fixed for 64bitness. | |
30 | * Rewrote much of the code over time | |
31 | * Added indirect block lists | |
32 | * Handle 64K limits on many controllers | |
33 | * Don't use indirects on the Promise (breaks) | |
34 | * Heavily chop down the queue depths | |
35 | * Deepak Saxena: | |
36 | * Independent queues per IOP | |
37 | * Support for dynamic device creation/deletion | |
38 | * Code cleanup | |
39 | * Support for larger I/Os through merge* functions | |
40 | * (taken from DAC960 driver) | |
41 | * Boji T Kannanthanam: | |
42 | * Set the I2O Block devices to be detected in increasing | |
43 | * order of TIDs during boot. | |
44 | * Search and set the I2O block device that we boot off | |
45 | * from as the first device to be claimed (as /dev/i2o/hda) | |
46 | * Properly attach/detach I2O gendisk structure from the | |
47 | * system gendisk list. The I2O block devices now appear in | |
48 | * /proc/partitions. | |
49 | * Markus Lidel <Markus.Lidel@shadowconnect.com>: | |
50 | * Minor bugfixes for 2.6. | |
51 | */ | |
52 | ||
53 | #include <linux/module.h> | |
54 | #include <linux/i2o.h> | |
55 | ||
56 | #include <linux/mempool.h> | |
57 | ||
58 | #include <linux/genhd.h> | |
59 | #include <linux/blkdev.h> | |
60 | #include <linux/hdreg.h> | |
61 | ||
62 | #include "i2o_block.h" | |
63 | ||
64 | #define OSM_NAME "block-osm" | |
65 | #define OSM_VERSION "$Rev$" | |
66 | #define OSM_DESCRIPTION "I2O Block Device OSM" | |
67 | ||
68 | static struct i2o_driver i2o_block_driver; | |
69 | ||
70 | /* global Block OSM request mempool */ | |
71 | static struct i2o_block_mempool i2o_blk_req_pool; | |
72 | ||
73 | /* Block OSM class handling definition */ | |
74 | static struct i2o_class_id i2o_block_class_id[] = { | |
75 | {I2O_CLASS_RANDOM_BLOCK_STORAGE}, | |
76 | {I2O_CLASS_END} | |
77 | }; | |
78 | ||
79 | /** | |
80 | * i2o_block_device_free - free the memory of the I2O Block device | |
81 | * @dev: I2O Block device, which should be cleaned up | |
82 | * | |
83 | * Frees the request queue, gendisk and the i2o_block_device structure. | |
84 | */ | |
85 | static void i2o_block_device_free(struct i2o_block_device *dev) | |
86 | { | |
87 | blk_cleanup_queue(dev->gd->queue); | |
88 | ||
89 | put_disk(dev->gd); | |
90 | ||
91 | kfree(dev); | |
92 | }; | |
93 | ||
94 | /** | |
95 | * i2o_block_remove - remove the I2O Block device from the system again | |
96 | * @dev: I2O Block device which should be removed | |
97 | * | |
98 | * Remove gendisk from system and free all allocated memory. | |
99 | * | |
100 | * Always returns 0. | |
101 | */ | |
102 | static int i2o_block_remove(struct device *dev) | |
103 | { | |
104 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
105 | struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev); | |
106 | ||
107 | osm_info("Device removed %s\n", i2o_blk_dev->gd->disk_name); | |
108 | ||
109 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0); | |
110 | ||
111 | del_gendisk(i2o_blk_dev->gd); | |
112 | ||
113 | dev_set_drvdata(dev, NULL); | |
114 | ||
115 | i2o_device_claim_release(i2o_dev); | |
116 | ||
117 | i2o_block_device_free(i2o_blk_dev); | |
118 | ||
119 | return 0; | |
120 | }; | |
121 | ||
122 | /** | |
123 | * i2o_block_device flush - Flush all dirty data of I2O device dev | |
124 | * @dev: I2O device which should be flushed | |
125 | * | |
126 | * Flushes all dirty data on device dev. | |
127 | * | |
128 | * Returns 0 on success or negative error code on failure. | |
129 | */ | |
130 | static int i2o_block_device_flush(struct i2o_device *dev) | |
131 | { | |
132 | struct i2o_message __iomem *msg; | |
133 | u32 m; | |
134 | ||
135 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
136 | if (m == I2O_QUEUE_EMPTY) | |
137 | return -ETIMEDOUT; | |
138 | ||
139 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
140 | writel(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev->lct_data.tid, | |
141 | &msg->u.head[1]); | |
142 | writel(60 << 16, &msg->body[0]); | |
143 | osm_debug("Flushing...\n"); | |
144 | ||
145 | return i2o_msg_post_wait(dev->iop, m, 60); | |
146 | }; | |
147 | ||
148 | /** | |
149 | * i2o_block_device_mount - Mount (load) the media of device dev | |
150 | * @dev: I2O device which should receive the mount request | |
151 | * @media_id: Media Identifier | |
152 | * | |
153 | * Load a media into drive. Identifier should be set to -1, because the | |
154 | * spec does not support any other value. | |
155 | * | |
156 | * Returns 0 on success or negative error code on failure. | |
157 | */ | |
158 | static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id) | |
159 | { | |
160 | struct i2o_message __iomem *msg; | |
161 | u32 m; | |
162 | ||
163 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
164 | if (m == I2O_QUEUE_EMPTY) | |
165 | return -ETIMEDOUT; | |
166 | ||
167 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
168 | writel(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev->lct_data.tid, | |
169 | &msg->u.head[1]); | |
170 | writel(-1, &msg->body[0]); | |
171 | writel(0, &msg->body[1]); | |
172 | osm_debug("Mounting...\n"); | |
173 | ||
174 | return i2o_msg_post_wait(dev->iop, m, 2); | |
175 | }; | |
176 | ||
177 | /** | |
178 | * i2o_block_device_lock - Locks the media of device dev | |
179 | * @dev: I2O device which should receive the lock request | |
180 | * @media_id: Media Identifier | |
181 | * | |
182 | * Lock media of device dev to prevent removal. The media identifier | |
183 | * should be set to -1, because the spec does not support any other value. | |
184 | * | |
185 | * Returns 0 on success or negative error code on failure. | |
186 | */ | |
187 | static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) | |
188 | { | |
189 | struct i2o_message __iomem *msg; | |
190 | u32 m; | |
191 | ||
192 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
193 | if (m == I2O_QUEUE_EMPTY) | |
194 | return -ETIMEDOUT; | |
195 | ||
196 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
197 | writel(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid, | |
198 | &msg->u.head[1]); | |
199 | writel(-1, &msg->body[0]); | |
200 | osm_debug("Locking...\n"); | |
201 | ||
202 | return i2o_msg_post_wait(dev->iop, m, 2); | |
203 | }; | |
204 | ||
205 | /** | |
206 | * i2o_block_device_unlock - Unlocks the media of device dev | |
207 | * @dev: I2O device which should receive the unlocked request | |
208 | * @media_id: Media Identifier | |
209 | * | |
210 | * Unlocks the media in device dev. The media identifier should be set to | |
211 | * -1, because the spec does not support any other value. | |
212 | * | |
213 | * Returns 0 on success or negative error code on failure. | |
214 | */ | |
215 | static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id) | |
216 | { | |
217 | struct i2o_message __iomem *msg; | |
218 | u32 m; | |
219 | ||
220 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
221 | if (m == I2O_QUEUE_EMPTY) | |
222 | return -ETIMEDOUT; | |
223 | ||
224 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
225 | writel(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid, | |
226 | &msg->u.head[1]); | |
227 | writel(media_id, &msg->body[0]); | |
228 | osm_debug("Unlocking...\n"); | |
229 | ||
230 | return i2o_msg_post_wait(dev->iop, m, 2); | |
231 | }; | |
232 | ||
233 | /** | |
234 | * i2o_block_device_power - Power management for device dev | |
235 | * @dev: I2O device which should receive the power management request | |
236 | * @operation: Operation which should be send | |
237 | * | |
238 | * Send a power management request to the device dev. | |
239 | * | |
240 | * Returns 0 on success or negative error code on failure. | |
241 | */ | |
242 | static int i2o_block_device_power(struct i2o_block_device *dev, u8 op) | |
243 | { | |
244 | struct i2o_device *i2o_dev = dev->i2o_dev; | |
245 | struct i2o_controller *c = i2o_dev->iop; | |
246 | struct i2o_message __iomem *msg; | |
247 | u32 m; | |
248 | int rc; | |
249 | ||
250 | m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
251 | if (m == I2O_QUEUE_EMPTY) | |
252 | return -ETIMEDOUT; | |
253 | ||
254 | writel(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
255 | writel(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev->lct_data. | |
256 | tid, &msg->u.head[1]); | |
257 | writel(op << 24, &msg->body[0]); | |
258 | osm_debug("Power...\n"); | |
259 | ||
260 | rc = i2o_msg_post_wait(c, m, 60); | |
261 | if (!rc) | |
262 | dev->power = op; | |
263 | ||
264 | return rc; | |
265 | }; | |
266 | ||
267 | /** | |
268 | * i2o_block_request_alloc - Allocate an I2O block request struct | |
269 | * | |
270 | * Allocates an I2O block request struct and initialize the list. | |
271 | * | |
272 | * Returns a i2o_block_request pointer on success or negative error code | |
273 | * on failure. | |
274 | */ | |
275 | static inline struct i2o_block_request *i2o_block_request_alloc(void) | |
276 | { | |
277 | struct i2o_block_request *ireq; | |
278 | ||
279 | ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC); | |
280 | if (!ireq) | |
281 | return ERR_PTR(-ENOMEM); | |
282 | ||
283 | INIT_LIST_HEAD(&ireq->queue); | |
284 | ||
285 | return ireq; | |
286 | }; | |
287 | ||
288 | /** | |
289 | * i2o_block_request_free - Frees a I2O block request | |
290 | * @ireq: I2O block request which should be freed | |
291 | * | |
292 | * Fres the allocated memory (give it back to the request mempool). | |
293 | */ | |
294 | static inline void i2o_block_request_free(struct i2o_block_request *ireq) | |
295 | { | |
296 | mempool_free(ireq, i2o_blk_req_pool.pool); | |
297 | }; | |
298 | ||
299 | /** | |
300 | * i2o_block_sglist_alloc - Allocate the SG list and map it | |
301 | * @ireq: I2O block request | |
302 | * | |
303 | * Builds the SG list and map it into to be accessable by the controller. | |
304 | * | |
305 | * Returns the number of elements in the SG list or 0 on failure. | |
306 | */ | |
307 | static inline int i2o_block_sglist_alloc(struct i2o_block_request *ireq) | |
308 | { | |
309 | struct device *dev = &ireq->i2o_blk_dev->i2o_dev->iop->pdev->dev; | |
310 | int nents; | |
311 | ||
312 | nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table); | |
313 | ||
314 | if (rq_data_dir(ireq->req) == READ) | |
315 | ireq->sg_dma_direction = PCI_DMA_FROMDEVICE; | |
316 | else | |
317 | ireq->sg_dma_direction = PCI_DMA_TODEVICE; | |
318 | ||
319 | ireq->sg_nents = dma_map_sg(dev, ireq->sg_table, nents, | |
320 | ireq->sg_dma_direction); | |
321 | ||
322 | return ireq->sg_nents; | |
323 | }; | |
324 | ||
325 | /** | |
326 | * i2o_block_sglist_free - Frees the SG list | |
327 | * @ireq: I2O block request from which the SG should be freed | |
328 | * | |
329 | * Frees the SG list from the I2O block request. | |
330 | */ | |
331 | static inline void i2o_block_sglist_free(struct i2o_block_request *ireq) | |
332 | { | |
333 | struct device *dev = &ireq->i2o_blk_dev->i2o_dev->iop->pdev->dev; | |
334 | ||
335 | dma_unmap_sg(dev, ireq->sg_table, ireq->sg_nents, | |
336 | ireq->sg_dma_direction); | |
337 | }; | |
338 | ||
339 | /** | |
340 | * i2o_block_prep_req_fn - Allocates I2O block device specific struct | |
341 | * @q: request queue for the request | |
342 | * @req: the request to prepare | |
343 | * | |
344 | * Allocate the necessary i2o_block_request struct and connect it to | |
345 | * the request. This is needed that we not loose the SG list later on. | |
346 | * | |
347 | * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure. | |
348 | */ | |
349 | static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req) | |
350 | { | |
351 | struct i2o_block_device *i2o_blk_dev = q->queuedata; | |
352 | struct i2o_block_request *ireq; | |
353 | ||
354 | /* request is already processed by us, so return */ | |
355 | if (req->flags & REQ_SPECIAL) { | |
356 | osm_debug("REQ_SPECIAL already set!\n"); | |
357 | req->flags |= REQ_DONTPREP; | |
358 | return BLKPREP_OK; | |
359 | } | |
360 | ||
361 | /* connect the i2o_block_request to the request */ | |
362 | if (!req->special) { | |
363 | ireq = i2o_block_request_alloc(); | |
364 | if (unlikely(IS_ERR(ireq))) { | |
365 | osm_debug("unable to allocate i2o_block_request!\n"); | |
366 | return BLKPREP_DEFER; | |
367 | } | |
368 | ||
369 | ireq->i2o_blk_dev = i2o_blk_dev; | |
370 | req->special = ireq; | |
371 | ireq->req = req; | |
372 | } else | |
373 | ireq = req->special; | |
374 | ||
375 | /* do not come back here */ | |
376 | req->flags |= REQ_DONTPREP | REQ_SPECIAL; | |
377 | ||
378 | return BLKPREP_OK; | |
379 | }; | |
380 | ||
381 | /** | |
382 | * i2o_block_delayed_request_fn - delayed request queue function | |
383 | * delayed_request: the delayed request with the queue to start | |
384 | * | |
385 | * If the request queue is stopped for a disk, and there is no open | |
386 | * request, a new event is created, which calls this function to start | |
387 | * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never | |
388 | * be started again. | |
389 | */ | |
390 | static void i2o_block_delayed_request_fn(void *delayed_request) | |
391 | { | |
392 | struct i2o_block_delayed_request *dreq = delayed_request; | |
393 | struct request_queue *q = dreq->queue; | |
394 | unsigned long flags; | |
395 | ||
396 | spin_lock_irqsave(q->queue_lock, flags); | |
397 | blk_start_queue(q); | |
398 | spin_unlock_irqrestore(q->queue_lock, flags); | |
399 | kfree(dreq); | |
400 | }; | |
401 | ||
402 | /** | |
403 | * i2o_block_reply - Block OSM reply handler. | |
404 | * @c: I2O controller from which the message arrives | |
405 | * @m: message id of reply | |
406 | * qmsg: the actuall I2O message reply | |
407 | * | |
408 | * This function gets all the message replies. | |
409 | * | |
410 | */ | |
411 | static int i2o_block_reply(struct i2o_controller *c, u32 m, | |
412 | struct i2o_message *msg) | |
413 | { | |
414 | struct i2o_block_request *ireq; | |
415 | struct request *req; | |
416 | struct i2o_block_device *dev; | |
417 | struct request_queue *q; | |
418 | u8 st; | |
419 | unsigned long flags; | |
420 | ||
421 | /* FAILed message */ | |
422 | if (unlikely(le32_to_cpu(msg->u.head[0]) & (1 << 13))) { | |
423 | struct i2o_message *pmsg; | |
424 | u32 pm; | |
425 | ||
426 | /* | |
427 | * FAILed message from controller | |
428 | * We increment the error count and abort it | |
429 | * | |
430 | * In theory this will never happen. The I2O block class | |
431 | * specification states that block devices never return | |
432 | * FAILs but instead use the REQ status field...but | |
433 | * better be on the safe side since no one really follows | |
434 | * the spec to the book :) | |
435 | */ | |
436 | pm = le32_to_cpu(msg->body[3]); | |
437 | pmsg = i2o_msg_in_to_virt(c, pm); | |
438 | ||
439 | req = i2o_cntxt_list_get(c, le32_to_cpu(pmsg->u.s.tcntxt)); | |
440 | if (unlikely(!req)) { | |
441 | osm_err("NULL reply received!\n"); | |
442 | return -1; | |
443 | } | |
444 | ||
445 | ireq = req->special; | |
446 | dev = ireq->i2o_blk_dev; | |
447 | q = dev->gd->queue; | |
448 | ||
449 | req->errors++; | |
450 | ||
451 | spin_lock_irqsave(q->queue_lock, flags); | |
452 | ||
453 | while (end_that_request_chunk(req, !req->errors, | |
454 | le32_to_cpu(pmsg->body[1]))) ; | |
455 | end_that_request_last(req); | |
456 | ||
457 | dev->open_queue_depth--; | |
458 | list_del(&ireq->queue); | |
459 | blk_start_queue(q); | |
460 | ||
461 | spin_unlock_irqrestore(q->queue_lock, flags); | |
462 | ||
463 | /* Now flush the message by making it a NOP */ | |
464 | i2o_msg_nop(c, pm); | |
465 | ||
466 | return -1; | |
467 | } | |
468 | ||
469 | req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); | |
470 | if (unlikely(!req)) { | |
471 | osm_err("NULL reply received!\n"); | |
472 | return -1; | |
473 | } | |
474 | ||
475 | ireq = req->special; | |
476 | dev = ireq->i2o_blk_dev; | |
477 | q = dev->gd->queue; | |
478 | ||
479 | if (unlikely(!dev->i2o_dev)) { | |
480 | /* | |
481 | * This is HACK, but Intel Integrated RAID allows user | |
482 | * to delete a volume that is claimed, locked, and in use | |
483 | * by the OS. We have to check for a reply from a | |
484 | * non-existent device and flag it as an error or the system | |
485 | * goes kaput... | |
486 | */ | |
487 | req->errors++; | |
488 | osm_warn("Data transfer to deleted device!\n"); | |
489 | spin_lock_irqsave(q->queue_lock, flags); | |
490 | while (end_that_request_chunk | |
491 | (req, !req->errors, le32_to_cpu(msg->body[1]))) ; | |
492 | end_that_request_last(req); | |
493 | ||
494 | dev->open_queue_depth--; | |
495 | list_del(&ireq->queue); | |
496 | blk_start_queue(q); | |
497 | ||
498 | spin_unlock_irqrestore(q->queue_lock, flags); | |
499 | return -1; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Lets see what is cooking. We stuffed the | |
504 | * request in the context. | |
505 | */ | |
506 | ||
507 | st = le32_to_cpu(msg->body[0]) >> 24; | |
508 | ||
509 | if (st != 0) { | |
510 | int err; | |
511 | char *bsa_errors[] = { | |
512 | "Success", | |
513 | "Media Error", | |
514 | "Failure communicating to device", | |
515 | "Device Failure", | |
516 | "Device is not ready", | |
517 | "Media not present", | |
518 | "Media is locked by another user", | |
519 | "Media has failed", | |
520 | "Failure communicating to device", | |
521 | "Device bus failure", | |
522 | "Device is locked by another user", | |
523 | "Device is write protected", | |
524 | "Device has reset", | |
525 | "Volume has changed, waiting for acknowledgement" | |
526 | }; | |
527 | ||
528 | err = le32_to_cpu(msg->body[0]) & 0xffff; | |
529 | ||
530 | /* | |
531 | * Device not ready means two things. One is that the | |
532 | * the thing went offline (but not a removal media) | |
533 | * | |
534 | * The second is that you have a SuperTrak 100 and the | |
535 | * firmware got constipated. Unlike standard i2o card | |
536 | * setups the supertrak returns an error rather than | |
537 | * blocking for the timeout in these cases. | |
538 | * | |
539 | * Don't stick a supertrak100 into cache aggressive modes | |
540 | */ | |
541 | ||
542 | osm_err("block-osm: /dev/%s error: %s", dev->gd->disk_name, | |
543 | bsa_errors[le32_to_cpu(msg->body[0]) & 0xffff]); | |
544 | if (le32_to_cpu(msg->body[0]) & 0x00ff0000) | |
545 | printk(KERN_ERR " - DDM attempted %d retries", | |
546 | (le32_to_cpu(msg->body[0]) >> 16) & 0x00ff); | |
547 | printk(KERN_ERR ".\n"); | |
548 | req->errors++; | |
549 | } else | |
550 | req->errors = 0; | |
551 | ||
552 | if (!end_that_request_chunk | |
553 | (req, !req->errors, le32_to_cpu(msg->body[1]))) { | |
554 | add_disk_randomness(req->rq_disk); | |
555 | spin_lock_irqsave(q->queue_lock, flags); | |
556 | ||
557 | end_that_request_last(req); | |
558 | ||
559 | dev->open_queue_depth--; | |
560 | list_del(&ireq->queue); | |
561 | blk_start_queue(q); | |
562 | ||
563 | spin_unlock_irqrestore(q->queue_lock, flags); | |
564 | ||
565 | i2o_block_sglist_free(ireq); | |
566 | i2o_block_request_free(ireq); | |
567 | } else | |
568 | osm_err("still remaining chunks\n"); | |
569 | ||
570 | return 1; | |
571 | }; | |
572 | ||
573 | static void i2o_block_event(struct i2o_event *evt) | |
574 | { | |
575 | osm_info("block-osm: event received\n"); | |
576 | }; | |
577 | ||
578 | /* | |
579 | * SCSI-CAM for ioctl geometry mapping | |
580 | * Duplicated with SCSI - this should be moved into somewhere common | |
581 | * perhaps genhd ? | |
582 | * | |
583 | * LBA -> CHS mapping table taken from: | |
584 | * | |
585 | * "Incorporating the I2O Architecture into BIOS for Intel Architecture | |
586 | * Platforms" | |
587 | * | |
588 | * This is an I2O document that is only available to I2O members, | |
589 | * not developers. | |
590 | * | |
591 | * From my understanding, this is how all the I2O cards do this | |
592 | * | |
593 | * Disk Size | Sectors | Heads | Cylinders | |
594 | * ---------------+---------+-------+------------------- | |
595 | * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512) | |
596 | * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512) | |
597 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
598 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
599 | * | |
600 | */ | |
601 | #define BLOCK_SIZE_528M 1081344 | |
602 | #define BLOCK_SIZE_1G 2097152 | |
603 | #define BLOCK_SIZE_21G 4403200 | |
604 | #define BLOCK_SIZE_42G 8806400 | |
605 | #define BLOCK_SIZE_84G 17612800 | |
606 | ||
607 | static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls, | |
608 | unsigned char *hds, unsigned char *secs) | |
609 | { | |
610 | unsigned long heads, sectors, cylinders; | |
611 | ||
612 | sectors = 63L; /* Maximize sectors per track */ | |
613 | if (capacity <= BLOCK_SIZE_528M) | |
614 | heads = 16; | |
615 | else if (capacity <= BLOCK_SIZE_1G) | |
616 | heads = 32; | |
617 | else if (capacity <= BLOCK_SIZE_21G) | |
618 | heads = 64; | |
619 | else if (capacity <= BLOCK_SIZE_42G) | |
620 | heads = 128; | |
621 | else | |
622 | heads = 255; | |
623 | ||
624 | cylinders = (unsigned long)capacity / (heads * sectors); | |
625 | ||
626 | *cyls = (unsigned short)cylinders; /* Stuff return values */ | |
627 | *secs = (unsigned char)sectors; | |
628 | *hds = (unsigned char)heads; | |
629 | } | |
630 | ||
631 | /** | |
632 | * i2o_block_open - Open the block device | |
633 | * | |
634 | * Power up the device, mount and lock the media. This function is called, | |
635 | * if the block device is opened for access. | |
636 | * | |
637 | * Returns 0 on success or negative error code on failure. | |
638 | */ | |
639 | static int i2o_block_open(struct inode *inode, struct file *file) | |
640 | { | |
641 | struct i2o_block_device *dev = inode->i_bdev->bd_disk->private_data; | |
642 | ||
643 | if (!dev->i2o_dev) | |
644 | return -ENODEV; | |
645 | ||
646 | if (dev->power > 0x1f) | |
647 | i2o_block_device_power(dev, 0x02); | |
648 | ||
649 | i2o_block_device_mount(dev->i2o_dev, -1); | |
650 | ||
651 | i2o_block_device_lock(dev->i2o_dev, -1); | |
652 | ||
653 | osm_debug("Ready.\n"); | |
654 | ||
655 | return 0; | |
656 | }; | |
657 | ||
658 | /** | |
659 | * i2o_block_release - Release the I2O block device | |
660 | * | |
661 | * Unlock and unmount the media, and power down the device. Gets called if | |
662 | * the block device is closed. | |
663 | * | |
664 | * Returns 0 on success or negative error code on failure. | |
665 | */ | |
666 | static int i2o_block_release(struct inode *inode, struct file *file) | |
667 | { | |
668 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
669 | struct i2o_block_device *dev = disk->private_data; | |
670 | u8 operation; | |
671 | ||
672 | /* | |
673 | * This is to deail with the case of an application | |
674 | * opening a device and then the device dissapears while | |
675 | * it's in use, and then the application tries to release | |
676 | * it. ex: Unmounting a deleted RAID volume at reboot. | |
677 | * If we send messages, it will just cause FAILs since | |
678 | * the TID no longer exists. | |
679 | */ | |
680 | if (!dev->i2o_dev) | |
681 | return 0; | |
682 | ||
683 | i2o_block_device_flush(dev->i2o_dev); | |
684 | ||
685 | i2o_block_device_unlock(dev->i2o_dev, -1); | |
686 | ||
687 | if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */ | |
688 | operation = 0x21; | |
689 | else | |
690 | operation = 0x24; | |
691 | ||
692 | i2o_block_device_power(dev, operation); | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | /** | |
698 | * i2o_block_ioctl - Issue device specific ioctl calls. | |
699 | * @cmd: ioctl command | |
700 | * @arg: arg | |
701 | * | |
702 | * Handles ioctl request for the block device. | |
703 | * | |
704 | * Return 0 on success or negative error on failure. | |
705 | */ | |
706 | static int i2o_block_ioctl(struct inode *inode, struct file *file, | |
707 | unsigned int cmd, unsigned long arg) | |
708 | { | |
709 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
710 | struct i2o_block_device *dev = disk->private_data; | |
711 | void __user *argp = (void __user *)arg; | |
712 | ||
713 | /* Anyone capable of this syscall can do *real bad* things */ | |
714 | ||
715 | if (!capable(CAP_SYS_ADMIN)) | |
716 | return -EPERM; | |
717 | ||
718 | switch (cmd) { | |
719 | case HDIO_GETGEO: | |
720 | { | |
721 | struct hd_geometry g; | |
722 | i2o_block_biosparam(get_capacity(disk), | |
723 | &g.cylinders, &g.heads, &g.sectors); | |
724 | g.start = get_start_sect(inode->i_bdev); | |
725 | return copy_to_user(argp, &g, sizeof(g)) ? -EFAULT : 0; | |
726 | } | |
727 | ||
728 | case BLKI2OGRSTRAT: | |
729 | return put_user(dev->rcache, (int __user *)arg); | |
730 | case BLKI2OGWSTRAT: | |
731 | return put_user(dev->wcache, (int __user *)arg); | |
732 | case BLKI2OSRSTRAT: | |
733 | if (arg < 0 || arg > CACHE_SMARTFETCH) | |
734 | return -EINVAL; | |
735 | dev->rcache = arg; | |
736 | break; | |
737 | case BLKI2OSWSTRAT: | |
738 | if (arg != 0 | |
739 | && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) | |
740 | return -EINVAL; | |
741 | dev->wcache = arg; | |
742 | break; | |
743 | } | |
744 | return -ENOTTY; | |
745 | }; | |
746 | ||
747 | /** | |
748 | * i2o_block_media_changed - Have we seen a media change? | |
749 | * @disk: gendisk which should be verified | |
750 | * | |
751 | * Verifies if the media has changed. | |
752 | * | |
753 | * Returns 1 if the media was changed or 0 otherwise. | |
754 | */ | |
755 | static int i2o_block_media_changed(struct gendisk *disk) | |
756 | { | |
757 | struct i2o_block_device *p = disk->private_data; | |
758 | ||
759 | if (p->media_change_flag) { | |
760 | p->media_change_flag = 0; | |
761 | return 1; | |
762 | } | |
763 | return 0; | |
764 | } | |
765 | ||
766 | /** | |
767 | * i2o_block_transfer - Transfer a request to/from the I2O controller | |
768 | * @req: the request which should be transfered | |
769 | * | |
770 | * This function converts the request into a I2O message. The necessary | |
771 | * DMA buffers are allocated and after everything is setup post the message | |
772 | * to the I2O controller. No cleanup is done by this function. It is done | |
773 | * on the interrupt side when the reply arrives. | |
774 | * | |
775 | * Return 0 on success or negative error code on failure. | |
776 | */ | |
777 | static int i2o_block_transfer(struct request *req) | |
778 | { | |
779 | struct i2o_block_device *dev = req->rq_disk->private_data; | |
780 | struct i2o_controller *c = dev->i2o_dev->iop; | |
781 | int tid = dev->i2o_dev->lct_data.tid; | |
782 | struct i2o_message __iomem *msg; | |
783 | void __iomem *mptr; | |
784 | struct i2o_block_request *ireq = req->special; | |
785 | struct scatterlist *sg; | |
786 | int sgnum; | |
787 | int i; | |
788 | u32 m; | |
789 | u32 tcntxt; | |
790 | u32 sg_flags; | |
791 | int rc; | |
792 | ||
793 | m = i2o_msg_get(c, &msg); | |
794 | if (m == I2O_QUEUE_EMPTY) { | |
795 | rc = -EBUSY; | |
796 | goto exit; | |
797 | } | |
798 | ||
799 | tcntxt = i2o_cntxt_list_add(c, req); | |
800 | if (!tcntxt) { | |
801 | rc = -ENOMEM; | |
802 | goto nop_msg; | |
803 | } | |
804 | ||
805 | if ((sgnum = i2o_block_sglist_alloc(ireq)) <= 0) { | |
806 | rc = -ENOMEM; | |
807 | goto context_remove; | |
808 | } | |
809 | ||
810 | /* Build the message based on the request. */ | |
811 | writel(i2o_block_driver.context, &msg->u.s.icntxt); | |
812 | writel(tcntxt, &msg->u.s.tcntxt); | |
813 | writel(req->nr_sectors << 9, &msg->body[1]); | |
814 | ||
815 | writel((((u64) req->sector) << 9) & 0xffffffff, &msg->body[2]); | |
816 | writel(req->sector >> 23, &msg->body[3]); | |
817 | ||
818 | mptr = &msg->body[4]; | |
819 | ||
820 | sg = ireq->sg_table; | |
821 | ||
822 | if (rq_data_dir(req) == READ) { | |
823 | writel(I2O_CMD_BLOCK_READ << 24 | HOST_TID << 12 | tid, | |
824 | &msg->u.head[1]); | |
825 | sg_flags = 0x10000000; | |
826 | switch (dev->rcache) { | |
827 | case CACHE_NULL: | |
828 | writel(0, &msg->body[0]); | |
829 | break; | |
830 | case CACHE_PREFETCH: | |
831 | writel(0x201F0008, &msg->body[0]); | |
832 | break; | |
833 | case CACHE_SMARTFETCH: | |
834 | if (req->nr_sectors > 16) | |
835 | writel(0x201F0008, &msg->body[0]); | |
836 | else | |
837 | writel(0x001F0000, &msg->body[0]); | |
838 | break; | |
839 | } | |
840 | } else { | |
841 | writel(I2O_CMD_BLOCK_WRITE << 24 | HOST_TID << 12 | tid, | |
842 | &msg->u.head[1]); | |
843 | sg_flags = 0x14000000; | |
844 | switch (dev->wcache) { | |
845 | case CACHE_NULL: | |
846 | writel(0, &msg->body[0]); | |
847 | break; | |
848 | case CACHE_WRITETHROUGH: | |
849 | writel(0x001F0008, &msg->body[0]); | |
850 | break; | |
851 | case CACHE_WRITEBACK: | |
852 | writel(0x001F0010, &msg->body[0]); | |
853 | break; | |
854 | case CACHE_SMARTBACK: | |
855 | if (req->nr_sectors > 16) | |
856 | writel(0x001F0004, &msg->body[0]); | |
857 | else | |
858 | writel(0x001F0010, &msg->body[0]); | |
859 | break; | |
860 | case CACHE_SMARTTHROUGH: | |
861 | if (req->nr_sectors > 16) | |
862 | writel(0x001F0004, &msg->body[0]); | |
863 | else | |
864 | writel(0x001F0010, &msg->body[0]); | |
865 | } | |
866 | } | |
867 | ||
868 | for (i = sgnum; i > 0; i--) { | |
869 | if (i == 1) | |
870 | sg_flags |= 0x80000000; | |
871 | writel(sg_flags | sg_dma_len(sg), mptr); | |
872 | writel(sg_dma_address(sg), mptr + 4); | |
873 | mptr += 8; | |
874 | sg++; | |
875 | } | |
876 | ||
877 | writel(I2O_MESSAGE_SIZE | |
878 | (((unsigned long)mptr - | |
879 | (unsigned long)&msg->u.head[0]) >> 2) | SGL_OFFSET_8, | |
880 | &msg->u.head[0]); | |
881 | ||
882 | list_add_tail(&ireq->queue, &dev->open_queue); | |
883 | dev->open_queue_depth++; | |
884 | ||
885 | i2o_msg_post(c, m); | |
886 | ||
887 | return 0; | |
888 | ||
889 | context_remove: | |
890 | i2o_cntxt_list_remove(c, req); | |
891 | ||
892 | nop_msg: | |
893 | i2o_msg_nop(c, m); | |
894 | ||
895 | exit: | |
896 | return rc; | |
897 | }; | |
898 | ||
899 | /** | |
900 | * i2o_block_request_fn - request queue handling function | |
901 | * q: request queue from which the request could be fetched | |
902 | * | |
903 | * Takes the next request from the queue, transfers it and if no error | |
904 | * occurs dequeue it from the queue. On arrival of the reply the message | |
905 | * will be processed further. If an error occurs requeue the request. | |
906 | */ | |
907 | static void i2o_block_request_fn(struct request_queue *q) | |
908 | { | |
909 | struct request *req; | |
910 | ||
911 | while (!blk_queue_plugged(q)) { | |
912 | req = elv_next_request(q); | |
913 | if (!req) | |
914 | break; | |
915 | ||
916 | if (blk_fs_request(req)) { | |
917 | struct i2o_block_delayed_request *dreq; | |
918 | struct i2o_block_request *ireq = req->special; | |
919 | unsigned int queue_depth; | |
920 | ||
921 | queue_depth = ireq->i2o_blk_dev->open_queue_depth; | |
922 | ||
923 | if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) | |
924 | if (!i2o_block_transfer(req)) { | |
925 | blkdev_dequeue_request(req); | |
926 | continue; | |
927 | } | |
928 | ||
929 | if (queue_depth) | |
930 | break; | |
931 | ||
932 | /* stop the queue and retry later */ | |
933 | dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC); | |
934 | if (!dreq) | |
935 | continue; | |
936 | ||
937 | dreq->queue = q; | |
938 | INIT_WORK(&dreq->work, i2o_block_delayed_request_fn, | |
939 | dreq); | |
940 | ||
941 | osm_info("transfer error\n"); | |
942 | if (!queue_delayed_work(i2o_block_driver.event_queue, | |
943 | &dreq->work, | |
944 | I2O_BLOCK_RETRY_TIME)) | |
945 | kfree(dreq); | |
946 | else { | |
947 | blk_stop_queue(q); | |
948 | break; | |
949 | } | |
950 | } else | |
951 | end_request(req, 0); | |
952 | } | |
953 | }; | |
954 | ||
955 | /* I2O Block device operations definition */ | |
956 | static struct block_device_operations i2o_block_fops = { | |
957 | .owner = THIS_MODULE, | |
958 | .open = i2o_block_open, | |
959 | .release = i2o_block_release, | |
960 | .ioctl = i2o_block_ioctl, | |
961 | .media_changed = i2o_block_media_changed | |
962 | }; | |
963 | ||
964 | /** | |
965 | * i2o_block_device_alloc - Allocate memory for a I2O Block device | |
966 | * | |
967 | * Allocate memory for the i2o_block_device struct, gendisk and request | |
968 | * queue and initialize them as far as no additional information is needed. | |
969 | * | |
970 | * Returns a pointer to the allocated I2O Block device on succes or a | |
971 | * negative error code on failure. | |
972 | */ | |
973 | static struct i2o_block_device *i2o_block_device_alloc(void) | |
974 | { | |
975 | struct i2o_block_device *dev; | |
976 | struct gendisk *gd; | |
977 | struct request_queue *queue; | |
978 | int rc; | |
979 | ||
980 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
981 | if (!dev) { | |
982 | osm_err("Insufficient memory to allocate I2O Block disk.\n"); | |
983 | rc = -ENOMEM; | |
984 | goto exit; | |
985 | } | |
986 | memset(dev, 0, sizeof(*dev)); | |
987 | ||
988 | INIT_LIST_HEAD(&dev->open_queue); | |
989 | spin_lock_init(&dev->lock); | |
990 | dev->rcache = CACHE_PREFETCH; | |
991 | dev->wcache = CACHE_WRITEBACK; | |
992 | ||
993 | /* allocate a gendisk with 16 partitions */ | |
994 | gd = alloc_disk(16); | |
995 | if (!gd) { | |
996 | osm_err("Insufficient memory to allocate gendisk.\n"); | |
997 | rc = -ENOMEM; | |
998 | goto cleanup_dev; | |
999 | } | |
1000 | ||
1001 | /* initialize the request queue */ | |
1002 | queue = blk_init_queue(i2o_block_request_fn, &dev->lock); | |
1003 | if (!queue) { | |
1004 | osm_err("Insufficient memory to allocate request queue.\n"); | |
1005 | rc = -ENOMEM; | |
1006 | goto cleanup_queue; | |
1007 | } | |
1008 | ||
1009 | blk_queue_prep_rq(queue, i2o_block_prep_req_fn); | |
1010 | ||
1011 | gd->major = I2O_MAJOR; | |
1012 | gd->queue = queue; | |
1013 | gd->fops = &i2o_block_fops; | |
1014 | gd->private_data = dev; | |
1015 | ||
1016 | dev->gd = gd; | |
1017 | ||
1018 | return dev; | |
1019 | ||
1020 | cleanup_queue: | |
1021 | put_disk(gd); | |
1022 | ||
1023 | cleanup_dev: | |
1024 | kfree(dev); | |
1025 | ||
1026 | exit: | |
1027 | return ERR_PTR(rc); | |
1028 | }; | |
1029 | ||
1030 | /** | |
1031 | * i2o_block_probe - verify if dev is a I2O Block device and install it | |
1032 | * @dev: device to verify if it is a I2O Block device | |
1033 | * | |
1034 | * We only verify if the user_tid of the device is 0xfff and then install | |
1035 | * the device. Otherwise it is used by some other device (e. g. RAID). | |
1036 | * | |
1037 | * Returns 0 on success or negative error code on failure. | |
1038 | */ | |
1039 | static int i2o_block_probe(struct device *dev) | |
1040 | { | |
1041 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
1042 | struct i2o_block_device *i2o_blk_dev; | |
1043 | struct i2o_controller *c = i2o_dev->iop; | |
1044 | struct gendisk *gd; | |
1045 | struct request_queue *queue; | |
1046 | static int unit = 0; | |
1047 | int rc; | |
1048 | u64 size; | |
1049 | u32 blocksize; | |
1050 | u16 power; | |
1051 | u32 flags, status; | |
1052 | int segments; | |
1053 | ||
1054 | /* skip devices which are used by IOP */ | |
1055 | if (i2o_dev->lct_data.user_tid != 0xfff) { | |
1056 | osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid); | |
1057 | return -ENODEV; | |
1058 | } | |
1059 | ||
1060 | osm_info("New device detected (TID: %03x)\n", i2o_dev->lct_data.tid); | |
1061 | ||
1062 | if (i2o_device_claim(i2o_dev)) { | |
1063 | osm_warn("Unable to claim device. Installation aborted\n"); | |
1064 | rc = -EFAULT; | |
1065 | goto exit; | |
1066 | } | |
1067 | ||
1068 | i2o_blk_dev = i2o_block_device_alloc(); | |
1069 | if (IS_ERR(i2o_blk_dev)) { | |
1070 | osm_err("could not alloc a new I2O block device"); | |
1071 | rc = PTR_ERR(i2o_blk_dev); | |
1072 | goto claim_release; | |
1073 | } | |
1074 | ||
1075 | i2o_blk_dev->i2o_dev = i2o_dev; | |
1076 | dev_set_drvdata(dev, i2o_blk_dev); | |
1077 | ||
1078 | /* setup gendisk */ | |
1079 | gd = i2o_blk_dev->gd; | |
1080 | gd->first_minor = unit << 4; | |
1081 | sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit); | |
1082 | sprintf(gd->devfs_name, "i2o/hd%c", 'a' + unit); | |
1083 | gd->driverfs_dev = &i2o_dev->device; | |
1084 | ||
1085 | /* setup request queue */ | |
1086 | queue = gd->queue; | |
1087 | queue->queuedata = i2o_blk_dev; | |
1088 | ||
1089 | blk_queue_max_phys_segments(queue, I2O_MAX_SEGMENTS); | |
1090 | blk_queue_max_sectors(queue, I2O_MAX_SECTORS); | |
1091 | ||
1092 | if (c->short_req) | |
1093 | segments = 8; | |
1094 | else { | |
1095 | i2o_status_block *sb; | |
1096 | ||
1097 | sb = c->status_block.virt; | |
1098 | ||
1099 | segments = (sb->inbound_frame_size - | |
1100 | sizeof(struct i2o_message) / 4 - 4) / 2; | |
1101 | } | |
1102 | ||
1103 | blk_queue_max_hw_segments(queue, segments); | |
1104 | ||
1105 | osm_debug("max sectors = %d\n", I2O_MAX_SECTORS); | |
1106 | osm_debug("phys segments = %d\n", I2O_MAX_SEGMENTS); | |
1107 | osm_debug("hw segments = %d\n", segments); | |
1108 | ||
1109 | /* | |
1110 | * Ask for the current media data. If that isn't supported | |
1111 | * then we ask for the device capacity data | |
1112 | */ | |
1113 | if (i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) != 0 | |
1114 | || i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) != 0) { | |
1115 | i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4); | |
1116 | i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8); | |
1117 | } | |
1118 | osm_debug("blocksize = %d\n", blocksize); | |
1119 | ||
1120 | if (i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2)) | |
1121 | power = 0; | |
1122 | i2o_parm_field_get(i2o_dev, 0x0000, 5, &flags, 4); | |
1123 | i2o_parm_field_get(i2o_dev, 0x0000, 6, &status, 4); | |
1124 | ||
1125 | set_capacity(gd, size >> 9); | |
1126 | ||
1127 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff); | |
1128 | ||
1129 | add_disk(gd); | |
1130 | ||
1131 | unit++; | |
1132 | ||
1133 | return 0; | |
1134 | ||
1135 | claim_release: | |
1136 | i2o_device_claim_release(i2o_dev); | |
1137 | ||
1138 | exit: | |
1139 | return rc; | |
1140 | }; | |
1141 | ||
1142 | /* Block OSM driver struct */ | |
1143 | static struct i2o_driver i2o_block_driver = { | |
1144 | .name = OSM_NAME, | |
1145 | .event = i2o_block_event, | |
1146 | .reply = i2o_block_reply, | |
1147 | .classes = i2o_block_class_id, | |
1148 | .driver = { | |
1149 | .probe = i2o_block_probe, | |
1150 | .remove = i2o_block_remove, | |
1151 | }, | |
1152 | }; | |
1153 | ||
1154 | /** | |
1155 | * i2o_block_init - Block OSM initialization function | |
1156 | * | |
1157 | * Allocate the slab and mempool for request structs, registers i2o_block | |
1158 | * block device and finally register the Block OSM in the I2O core. | |
1159 | * | |
1160 | * Returns 0 on success or negative error code on failure. | |
1161 | */ | |
1162 | static int __init i2o_block_init(void) | |
1163 | { | |
1164 | int rc; | |
1165 | int size; | |
1166 | ||
1167 | printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); | |
1168 | ||
1169 | /* Allocate request mempool and slab */ | |
1170 | size = sizeof(struct i2o_block_request); | |
1171 | i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0, | |
1172 | SLAB_HWCACHE_ALIGN, NULL, | |
1173 | NULL); | |
1174 | if (!i2o_blk_req_pool.slab) { | |
1175 | osm_err("can't init request slab\n"); | |
1176 | rc = -ENOMEM; | |
1177 | goto exit; | |
1178 | } | |
1179 | ||
1180 | i2o_blk_req_pool.pool = mempool_create(I2O_REQ_MEMPOOL_SIZE, | |
1181 | mempool_alloc_slab, | |
1182 | mempool_free_slab, | |
1183 | i2o_blk_req_pool.slab); | |
1184 | if (!i2o_blk_req_pool.pool) { | |
1185 | osm_err("can't init request mempool\n"); | |
1186 | rc = -ENOMEM; | |
1187 | goto free_slab; | |
1188 | } | |
1189 | ||
1190 | /* Register the block device interfaces */ | |
1191 | rc = register_blkdev(I2O_MAJOR, "i2o_block"); | |
1192 | if (rc) { | |
1193 | osm_err("unable to register block device\n"); | |
1194 | goto free_mempool; | |
1195 | } | |
1196 | #ifdef MODULE | |
1197 | osm_info("registered device at major %d\n", I2O_MAJOR); | |
1198 | #endif | |
1199 | ||
1200 | /* Register Block OSM into I2O core */ | |
1201 | rc = i2o_driver_register(&i2o_block_driver); | |
1202 | if (rc) { | |
1203 | osm_err("Could not register Block driver\n"); | |
1204 | goto unregister_blkdev; | |
1205 | } | |
1206 | ||
1207 | return 0; | |
1208 | ||
1209 | unregister_blkdev: | |
1210 | unregister_blkdev(I2O_MAJOR, "i2o_block"); | |
1211 | ||
1212 | free_mempool: | |
1213 | mempool_destroy(i2o_blk_req_pool.pool); | |
1214 | ||
1215 | free_slab: | |
1216 | kmem_cache_destroy(i2o_blk_req_pool.slab); | |
1217 | ||
1218 | exit: | |
1219 | return rc; | |
1220 | }; | |
1221 | ||
1222 | /** | |
1223 | * i2o_block_exit - Block OSM exit function | |
1224 | * | |
1225 | * Unregisters Block OSM from I2O core, unregisters i2o_block block device | |
1226 | * and frees the mempool and slab. | |
1227 | */ | |
1228 | static void __exit i2o_block_exit(void) | |
1229 | { | |
1230 | /* Unregister I2O Block OSM from I2O core */ | |
1231 | i2o_driver_unregister(&i2o_block_driver); | |
1232 | ||
1233 | /* Unregister block device */ | |
1234 | unregister_blkdev(I2O_MAJOR, "i2o_block"); | |
1235 | ||
1236 | /* Free request mempool and slab */ | |
1237 | mempool_destroy(i2o_blk_req_pool.pool); | |
1238 | kmem_cache_destroy(i2o_blk_req_pool.slab); | |
1239 | }; | |
1240 | ||
1241 | MODULE_AUTHOR("Red Hat"); | |
1242 | MODULE_LICENSE("GPL"); | |
1243 | MODULE_DESCRIPTION(OSM_DESCRIPTION); | |
1244 | MODULE_VERSION(OSM_VERSION); | |
1245 | ||
1246 | module_init(i2o_block_init); | |
1247 | module_exit(i2o_block_exit); |