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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" | |
9e87545f | 65 | #define OSM_VERSION "1.287" |
1da177e4 LT |
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 | ||
f88e119c ML |
107 | osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid, |
108 | i2o_blk_dev->gd->disk_name); | |
1da177e4 LT |
109 | |
110 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0); | |
111 | ||
112 | del_gendisk(i2o_blk_dev->gd); | |
113 | ||
114 | dev_set_drvdata(dev, NULL); | |
115 | ||
116 | i2o_device_claim_release(i2o_dev); | |
117 | ||
118 | i2o_block_device_free(i2o_blk_dev); | |
119 | ||
120 | return 0; | |
121 | }; | |
122 | ||
123 | /** | |
124 | * i2o_block_device flush - Flush all dirty data of I2O device dev | |
125 | * @dev: I2O device which should be flushed | |
126 | * | |
127 | * Flushes all dirty data on device dev. | |
128 | * | |
129 | * Returns 0 on success or negative error code on failure. | |
130 | */ | |
131 | static int i2o_block_device_flush(struct i2o_device *dev) | |
132 | { | |
133 | struct i2o_message __iomem *msg; | |
134 | u32 m; | |
135 | ||
136 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
137 | if (m == I2O_QUEUE_EMPTY) | |
138 | return -ETIMEDOUT; | |
139 | ||
140 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
141 | writel(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev->lct_data.tid, | |
142 | &msg->u.head[1]); | |
143 | writel(60 << 16, &msg->body[0]); | |
144 | osm_debug("Flushing...\n"); | |
145 | ||
146 | return i2o_msg_post_wait(dev->iop, m, 60); | |
147 | }; | |
148 | ||
f10378ff ML |
149 | /** |
150 | * i2o_block_issue_flush - device-flush interface for block-layer | |
151 | * @queue: the request queue of the device which should be flushed | |
152 | * @disk: gendisk | |
153 | * @error_sector: error offset | |
154 | * | |
155 | * Helper function to provide flush functionality to block-layer. | |
156 | * | |
157 | * Returns 0 on success or negative error code on failure. | |
158 | */ | |
159 | ||
160 | static int i2o_block_issue_flush(request_queue_t * queue, struct gendisk *disk, | |
161 | sector_t * error_sector) | |
162 | { | |
163 | struct i2o_block_device *i2o_blk_dev = queue->queuedata; | |
164 | int rc = -ENODEV; | |
165 | ||
166 | if (likely(i2o_blk_dev)) | |
167 | rc = i2o_block_device_flush(i2o_blk_dev->i2o_dev); | |
168 | ||
169 | return rc; | |
170 | } | |
171 | ||
1da177e4 LT |
172 | /** |
173 | * i2o_block_device_mount - Mount (load) the media of device dev | |
174 | * @dev: I2O device which should receive the mount request | |
175 | * @media_id: Media Identifier | |
176 | * | |
177 | * Load a media into drive. Identifier should be set to -1, because the | |
178 | * spec does not support any other value. | |
179 | * | |
180 | * Returns 0 on success or negative error code on failure. | |
181 | */ | |
182 | static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id) | |
183 | { | |
184 | struct i2o_message __iomem *msg; | |
185 | u32 m; | |
186 | ||
187 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
188 | if (m == I2O_QUEUE_EMPTY) | |
189 | return -ETIMEDOUT; | |
190 | ||
191 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
192 | writel(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev->lct_data.tid, | |
193 | &msg->u.head[1]); | |
194 | writel(-1, &msg->body[0]); | |
195 | writel(0, &msg->body[1]); | |
196 | osm_debug("Mounting...\n"); | |
197 | ||
198 | return i2o_msg_post_wait(dev->iop, m, 2); | |
199 | }; | |
200 | ||
201 | /** | |
202 | * i2o_block_device_lock - Locks the media of device dev | |
203 | * @dev: I2O device which should receive the lock request | |
204 | * @media_id: Media Identifier | |
205 | * | |
206 | * Lock media of device dev to prevent removal. The media identifier | |
207 | * should be set to -1, because the spec does not support any other value. | |
208 | * | |
209 | * Returns 0 on success or negative error code on failure. | |
210 | */ | |
211 | static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) | |
212 | { | |
213 | struct i2o_message __iomem *msg; | |
214 | u32 m; | |
215 | ||
216 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
217 | if (m == I2O_QUEUE_EMPTY) | |
218 | return -ETIMEDOUT; | |
219 | ||
220 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
221 | writel(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid, | |
222 | &msg->u.head[1]); | |
223 | writel(-1, &msg->body[0]); | |
224 | osm_debug("Locking...\n"); | |
225 | ||
226 | return i2o_msg_post_wait(dev->iop, m, 2); | |
227 | }; | |
228 | ||
229 | /** | |
230 | * i2o_block_device_unlock - Unlocks the media of device dev | |
231 | * @dev: I2O device which should receive the unlocked request | |
232 | * @media_id: Media Identifier | |
233 | * | |
234 | * Unlocks the media in device dev. The media identifier should be set to | |
235 | * -1, because the spec does not support any other value. | |
236 | * | |
237 | * Returns 0 on success or negative error code on failure. | |
238 | */ | |
239 | static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id) | |
240 | { | |
241 | struct i2o_message __iomem *msg; | |
242 | u32 m; | |
243 | ||
244 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
245 | if (m == I2O_QUEUE_EMPTY) | |
246 | return -ETIMEDOUT; | |
247 | ||
248 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
249 | writel(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid, | |
250 | &msg->u.head[1]); | |
251 | writel(media_id, &msg->body[0]); | |
252 | osm_debug("Unlocking...\n"); | |
253 | ||
254 | return i2o_msg_post_wait(dev->iop, m, 2); | |
255 | }; | |
256 | ||
257 | /** | |
258 | * i2o_block_device_power - Power management for device dev | |
259 | * @dev: I2O device which should receive the power management request | |
260 | * @operation: Operation which should be send | |
261 | * | |
262 | * Send a power management request to the device dev. | |
263 | * | |
264 | * Returns 0 on success or negative error code on failure. | |
265 | */ | |
266 | static int i2o_block_device_power(struct i2o_block_device *dev, u8 op) | |
267 | { | |
268 | struct i2o_device *i2o_dev = dev->i2o_dev; | |
269 | struct i2o_controller *c = i2o_dev->iop; | |
270 | struct i2o_message __iomem *msg; | |
271 | u32 m; | |
272 | int rc; | |
273 | ||
274 | m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
275 | if (m == I2O_QUEUE_EMPTY) | |
276 | return -ETIMEDOUT; | |
277 | ||
278 | writel(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
279 | writel(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev->lct_data. | |
280 | tid, &msg->u.head[1]); | |
281 | writel(op << 24, &msg->body[0]); | |
282 | osm_debug("Power...\n"); | |
283 | ||
284 | rc = i2o_msg_post_wait(c, m, 60); | |
285 | if (!rc) | |
286 | dev->power = op; | |
287 | ||
288 | return rc; | |
289 | }; | |
290 | ||
291 | /** | |
292 | * i2o_block_request_alloc - Allocate an I2O block request struct | |
293 | * | |
294 | * Allocates an I2O block request struct and initialize the list. | |
295 | * | |
296 | * Returns a i2o_block_request pointer on success or negative error code | |
297 | * on failure. | |
298 | */ | |
299 | static inline struct i2o_block_request *i2o_block_request_alloc(void) | |
300 | { | |
301 | struct i2o_block_request *ireq; | |
302 | ||
303 | ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC); | |
304 | if (!ireq) | |
305 | return ERR_PTR(-ENOMEM); | |
306 | ||
307 | INIT_LIST_HEAD(&ireq->queue); | |
308 | ||
309 | return ireq; | |
310 | }; | |
311 | ||
312 | /** | |
313 | * i2o_block_request_free - Frees a I2O block request | |
314 | * @ireq: I2O block request which should be freed | |
315 | * | |
316 | * Fres the allocated memory (give it back to the request mempool). | |
317 | */ | |
318 | static inline void i2o_block_request_free(struct i2o_block_request *ireq) | |
319 | { | |
320 | mempool_free(ireq, i2o_blk_req_pool.pool); | |
321 | }; | |
322 | ||
323 | /** | |
324 | * i2o_block_sglist_alloc - Allocate the SG list and map it | |
f10378ff | 325 | * @c: I2O controller to which the request belongs |
1da177e4 LT |
326 | * @ireq: I2O block request |
327 | * | |
f10378ff | 328 | * Builds the SG list and map it to be accessable by the controller. |
1da177e4 | 329 | * |
f10378ff | 330 | * Returns 0 on failure or 1 on success. |
1da177e4 | 331 | */ |
f10378ff ML |
332 | static inline int i2o_block_sglist_alloc(struct i2o_controller *c, |
333 | struct i2o_block_request *ireq, | |
334 | u32 __iomem ** mptr) | |
1da177e4 | 335 | { |
1da177e4 | 336 | int nents; |
f10378ff | 337 | enum dma_data_direction direction; |
1da177e4 | 338 | |
f10378ff | 339 | ireq->dev = &c->pdev->dev; |
1da177e4 LT |
340 | nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table); |
341 | ||
342 | if (rq_data_dir(ireq->req) == READ) | |
f10378ff | 343 | direction = PCI_DMA_FROMDEVICE; |
1da177e4 | 344 | else |
f10378ff | 345 | direction = PCI_DMA_TODEVICE; |
1da177e4 | 346 | |
f10378ff | 347 | ireq->sg_nents = nents; |
1da177e4 | 348 | |
f10378ff | 349 | return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr); |
1da177e4 LT |
350 | }; |
351 | ||
352 | /** | |
353 | * i2o_block_sglist_free - Frees the SG list | |
354 | * @ireq: I2O block request from which the SG should be freed | |
355 | * | |
356 | * Frees the SG list from the I2O block request. | |
357 | */ | |
358 | static inline void i2o_block_sglist_free(struct i2o_block_request *ireq) | |
359 | { | |
f10378ff | 360 | enum dma_data_direction direction; |
1da177e4 | 361 | |
f10378ff ML |
362 | if (rq_data_dir(ireq->req) == READ) |
363 | direction = PCI_DMA_FROMDEVICE; | |
364 | else | |
365 | direction = PCI_DMA_TODEVICE; | |
366 | ||
367 | dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction); | |
1da177e4 LT |
368 | }; |
369 | ||
370 | /** | |
371 | * i2o_block_prep_req_fn - Allocates I2O block device specific struct | |
372 | * @q: request queue for the request | |
373 | * @req: the request to prepare | |
374 | * | |
375 | * Allocate the necessary i2o_block_request struct and connect it to | |
376 | * the request. This is needed that we not loose the SG list later on. | |
377 | * | |
378 | * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure. | |
379 | */ | |
380 | static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req) | |
381 | { | |
382 | struct i2o_block_device *i2o_blk_dev = q->queuedata; | |
383 | struct i2o_block_request *ireq; | |
384 | ||
f10378ff ML |
385 | if (unlikely(!i2o_blk_dev)) { |
386 | osm_err("block device already removed\n"); | |
387 | return BLKPREP_KILL; | |
388 | } | |
389 | ||
1da177e4 LT |
390 | /* request is already processed by us, so return */ |
391 | if (req->flags & REQ_SPECIAL) { | |
392 | osm_debug("REQ_SPECIAL already set!\n"); | |
393 | req->flags |= REQ_DONTPREP; | |
394 | return BLKPREP_OK; | |
395 | } | |
396 | ||
397 | /* connect the i2o_block_request to the request */ | |
398 | if (!req->special) { | |
399 | ireq = i2o_block_request_alloc(); | |
400 | if (unlikely(IS_ERR(ireq))) { | |
401 | osm_debug("unable to allocate i2o_block_request!\n"); | |
402 | return BLKPREP_DEFER; | |
403 | } | |
404 | ||
405 | ireq->i2o_blk_dev = i2o_blk_dev; | |
406 | req->special = ireq; | |
407 | ireq->req = req; | |
408 | } else | |
409 | ireq = req->special; | |
410 | ||
411 | /* do not come back here */ | |
412 | req->flags |= REQ_DONTPREP | REQ_SPECIAL; | |
413 | ||
414 | return BLKPREP_OK; | |
415 | }; | |
416 | ||
417 | /** | |
418 | * i2o_block_delayed_request_fn - delayed request queue function | |
419 | * delayed_request: the delayed request with the queue to start | |
420 | * | |
421 | * If the request queue is stopped for a disk, and there is no open | |
422 | * request, a new event is created, which calls this function to start | |
423 | * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never | |
424 | * be started again. | |
425 | */ | |
426 | static void i2o_block_delayed_request_fn(void *delayed_request) | |
427 | { | |
428 | struct i2o_block_delayed_request *dreq = delayed_request; | |
429 | struct request_queue *q = dreq->queue; | |
430 | unsigned long flags; | |
431 | ||
432 | spin_lock_irqsave(q->queue_lock, flags); | |
433 | blk_start_queue(q); | |
434 | spin_unlock_irqrestore(q->queue_lock, flags); | |
435 | kfree(dreq); | |
436 | }; | |
437 | ||
438 | /** | |
f88e119c ML |
439 | * i2o_block_end_request - Post-processing of completed commands |
440 | * @req: request which should be completed | |
441 | * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error | |
442 | * @nr_bytes: number of bytes to complete | |
1da177e4 | 443 | * |
f88e119c | 444 | * Mark the request as complete. The lock must not be held when entering. |
1da177e4 LT |
445 | * |
446 | */ | |
f88e119c ML |
447 | static void i2o_block_end_request(struct request *req, int uptodate, |
448 | int nr_bytes) | |
1da177e4 | 449 | { |
f88e119c ML |
450 | struct i2o_block_request *ireq = req->special; |
451 | struct i2o_block_device *dev = ireq->i2o_blk_dev; | |
f10378ff | 452 | request_queue_t *q = req->q; |
1da177e4 LT |
453 | unsigned long flags; |
454 | ||
f88e119c | 455 | if (end_that_request_chunk(req, uptodate, nr_bytes)) { |
f10378ff | 456 | int leftover = (req->hard_nr_sectors << KERNEL_SECTOR_SHIFT); |
1da177e4 | 457 | |
f88e119c ML |
458 | if (blk_pc_request(req)) |
459 | leftover = req->data_len; | |
1da177e4 | 460 | |
f88e119c ML |
461 | if (end_io_error(uptodate)) |
462 | end_that_request_chunk(req, 0, leftover); | |
463 | } | |
1da177e4 | 464 | |
f88e119c | 465 | add_disk_randomness(req->rq_disk); |
1da177e4 | 466 | |
f88e119c | 467 | spin_lock_irqsave(q->queue_lock, flags); |
1da177e4 | 468 | |
f88e119c | 469 | end_that_request_last(req); |
f10378ff ML |
470 | |
471 | if (likely(dev)) { | |
472 | dev->open_queue_depth--; | |
473 | list_del(&ireq->queue); | |
474 | } | |
1da177e4 | 475 | |
f88e119c | 476 | blk_start_queue(q); |
1da177e4 | 477 | |
f88e119c | 478 | spin_unlock_irqrestore(q->queue_lock, flags); |
1da177e4 | 479 | |
f88e119c ML |
480 | i2o_block_sglist_free(ireq); |
481 | i2o_block_request_free(ireq); | |
482 | }; | |
1da177e4 | 483 | |
f88e119c ML |
484 | /** |
485 | * i2o_block_reply - Block OSM reply handler. | |
486 | * @c: I2O controller from which the message arrives | |
487 | * @m: message id of reply | |
488 | * qmsg: the actuall I2O message reply | |
489 | * | |
490 | * This function gets all the message replies. | |
491 | * | |
492 | */ | |
493 | static int i2o_block_reply(struct i2o_controller *c, u32 m, | |
494 | struct i2o_message *msg) | |
495 | { | |
496 | struct request *req; | |
497 | int uptodate = 1; | |
1da177e4 LT |
498 | |
499 | req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); | |
500 | if (unlikely(!req)) { | |
501 | osm_err("NULL reply received!\n"); | |
502 | return -1; | |
503 | } | |
504 | ||
1da177e4 LT |
505 | /* |
506 | * Lets see what is cooking. We stuffed the | |
507 | * request in the context. | |
508 | */ | |
509 | ||
f88e119c ML |
510 | if ((le32_to_cpu(msg->body[0]) >> 24) != 0) { |
511 | u32 status = le32_to_cpu(msg->body[0]); | |
1da177e4 LT |
512 | /* |
513 | * Device not ready means two things. One is that the | |
514 | * the thing went offline (but not a removal media) | |
515 | * | |
516 | * The second is that you have a SuperTrak 100 and the | |
517 | * firmware got constipated. Unlike standard i2o card | |
518 | * setups the supertrak returns an error rather than | |
519 | * blocking for the timeout in these cases. | |
520 | * | |
521 | * Don't stick a supertrak100 into cache aggressive modes | |
522 | */ | |
523 | ||
f10378ff ML |
524 | osm_err("TID %03x error status: 0x%02x, detailed status: " |
525 | "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff), | |
f88e119c | 526 | status >> 24, status & 0xffff); |
1da177e4 | 527 | |
f88e119c | 528 | req->errors++; |
1da177e4 | 529 | |
f88e119c ML |
530 | uptodate = 0; |
531 | } | |
1da177e4 | 532 | |
f88e119c | 533 | i2o_block_end_request(req, uptodate, le32_to_cpu(msg->body[1])); |
1da177e4 LT |
534 | |
535 | return 1; | |
536 | }; | |
537 | ||
538 | static void i2o_block_event(struct i2o_event *evt) | |
539 | { | |
9e87545f | 540 | osm_debug("event received\n"); |
223230e7 | 541 | kfree(evt); |
1da177e4 LT |
542 | }; |
543 | ||
544 | /* | |
545 | * SCSI-CAM for ioctl geometry mapping | |
546 | * Duplicated with SCSI - this should be moved into somewhere common | |
547 | * perhaps genhd ? | |
548 | * | |
549 | * LBA -> CHS mapping table taken from: | |
550 | * | |
551 | * "Incorporating the I2O Architecture into BIOS for Intel Architecture | |
552 | * Platforms" | |
553 | * | |
554 | * This is an I2O document that is only available to I2O members, | |
555 | * not developers. | |
556 | * | |
557 | * From my understanding, this is how all the I2O cards do this | |
558 | * | |
559 | * Disk Size | Sectors | Heads | Cylinders | |
560 | * ---------------+---------+-------+------------------- | |
561 | * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512) | |
562 | * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512) | |
563 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
564 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
565 | * | |
566 | */ | |
567 | #define BLOCK_SIZE_528M 1081344 | |
568 | #define BLOCK_SIZE_1G 2097152 | |
569 | #define BLOCK_SIZE_21G 4403200 | |
570 | #define BLOCK_SIZE_42G 8806400 | |
571 | #define BLOCK_SIZE_84G 17612800 | |
572 | ||
573 | static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls, | |
574 | unsigned char *hds, unsigned char *secs) | |
575 | { | |
576 | unsigned long heads, sectors, cylinders; | |
577 | ||
578 | sectors = 63L; /* Maximize sectors per track */ | |
579 | if (capacity <= BLOCK_SIZE_528M) | |
580 | heads = 16; | |
581 | else if (capacity <= BLOCK_SIZE_1G) | |
582 | heads = 32; | |
583 | else if (capacity <= BLOCK_SIZE_21G) | |
584 | heads = 64; | |
585 | else if (capacity <= BLOCK_SIZE_42G) | |
586 | heads = 128; | |
587 | else | |
588 | heads = 255; | |
589 | ||
590 | cylinders = (unsigned long)capacity / (heads * sectors); | |
591 | ||
592 | *cyls = (unsigned short)cylinders; /* Stuff return values */ | |
593 | *secs = (unsigned char)sectors; | |
594 | *hds = (unsigned char)heads; | |
595 | } | |
596 | ||
597 | /** | |
598 | * i2o_block_open - Open the block device | |
599 | * | |
600 | * Power up the device, mount and lock the media. This function is called, | |
601 | * if the block device is opened for access. | |
602 | * | |
603 | * Returns 0 on success or negative error code on failure. | |
604 | */ | |
605 | static int i2o_block_open(struct inode *inode, struct file *file) | |
606 | { | |
607 | struct i2o_block_device *dev = inode->i_bdev->bd_disk->private_data; | |
608 | ||
609 | if (!dev->i2o_dev) | |
610 | return -ENODEV; | |
611 | ||
612 | if (dev->power > 0x1f) | |
613 | i2o_block_device_power(dev, 0x02); | |
614 | ||
615 | i2o_block_device_mount(dev->i2o_dev, -1); | |
616 | ||
617 | i2o_block_device_lock(dev->i2o_dev, -1); | |
618 | ||
619 | osm_debug("Ready.\n"); | |
620 | ||
621 | return 0; | |
622 | }; | |
623 | ||
624 | /** | |
625 | * i2o_block_release - Release the I2O block device | |
626 | * | |
627 | * Unlock and unmount the media, and power down the device. Gets called if | |
628 | * the block device is closed. | |
629 | * | |
630 | * Returns 0 on success or negative error code on failure. | |
631 | */ | |
632 | static int i2o_block_release(struct inode *inode, struct file *file) | |
633 | { | |
634 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
635 | struct i2o_block_device *dev = disk->private_data; | |
636 | u8 operation; | |
637 | ||
638 | /* | |
639 | * This is to deail with the case of an application | |
640 | * opening a device and then the device dissapears while | |
641 | * it's in use, and then the application tries to release | |
642 | * it. ex: Unmounting a deleted RAID volume at reboot. | |
643 | * If we send messages, it will just cause FAILs since | |
644 | * the TID no longer exists. | |
645 | */ | |
646 | if (!dev->i2o_dev) | |
647 | return 0; | |
648 | ||
649 | i2o_block_device_flush(dev->i2o_dev); | |
650 | ||
651 | i2o_block_device_unlock(dev->i2o_dev, -1); | |
652 | ||
653 | if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */ | |
654 | operation = 0x21; | |
655 | else | |
656 | operation = 0x24; | |
657 | ||
658 | i2o_block_device_power(dev, operation); | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | /** | |
664 | * i2o_block_ioctl - Issue device specific ioctl calls. | |
665 | * @cmd: ioctl command | |
666 | * @arg: arg | |
667 | * | |
668 | * Handles ioctl request for the block device. | |
669 | * | |
670 | * Return 0 on success or negative error on failure. | |
671 | */ | |
672 | static int i2o_block_ioctl(struct inode *inode, struct file *file, | |
673 | unsigned int cmd, unsigned long arg) | |
674 | { | |
675 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
676 | struct i2o_block_device *dev = disk->private_data; | |
677 | void __user *argp = (void __user *)arg; | |
678 | ||
679 | /* Anyone capable of this syscall can do *real bad* things */ | |
680 | ||
681 | if (!capable(CAP_SYS_ADMIN)) | |
682 | return -EPERM; | |
683 | ||
684 | switch (cmd) { | |
685 | case HDIO_GETGEO: | |
686 | { | |
687 | struct hd_geometry g; | |
688 | i2o_block_biosparam(get_capacity(disk), | |
689 | &g.cylinders, &g.heads, &g.sectors); | |
690 | g.start = get_start_sect(inode->i_bdev); | |
691 | return copy_to_user(argp, &g, sizeof(g)) ? -EFAULT : 0; | |
692 | } | |
693 | ||
694 | case BLKI2OGRSTRAT: | |
695 | return put_user(dev->rcache, (int __user *)arg); | |
696 | case BLKI2OGWSTRAT: | |
697 | return put_user(dev->wcache, (int __user *)arg); | |
698 | case BLKI2OSRSTRAT: | |
699 | if (arg < 0 || arg > CACHE_SMARTFETCH) | |
700 | return -EINVAL; | |
701 | dev->rcache = arg; | |
702 | break; | |
703 | case BLKI2OSWSTRAT: | |
704 | if (arg != 0 | |
705 | && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) | |
706 | return -EINVAL; | |
707 | dev->wcache = arg; | |
708 | break; | |
709 | } | |
710 | return -ENOTTY; | |
711 | }; | |
712 | ||
713 | /** | |
714 | * i2o_block_media_changed - Have we seen a media change? | |
715 | * @disk: gendisk which should be verified | |
716 | * | |
717 | * Verifies if the media has changed. | |
718 | * | |
719 | * Returns 1 if the media was changed or 0 otherwise. | |
720 | */ | |
721 | static int i2o_block_media_changed(struct gendisk *disk) | |
722 | { | |
723 | struct i2o_block_device *p = disk->private_data; | |
724 | ||
725 | if (p->media_change_flag) { | |
726 | p->media_change_flag = 0; | |
727 | return 1; | |
728 | } | |
729 | return 0; | |
730 | } | |
731 | ||
732 | /** | |
733 | * i2o_block_transfer - Transfer a request to/from the I2O controller | |
734 | * @req: the request which should be transfered | |
735 | * | |
736 | * This function converts the request into a I2O message. The necessary | |
737 | * DMA buffers are allocated and after everything is setup post the message | |
738 | * to the I2O controller. No cleanup is done by this function. It is done | |
739 | * on the interrupt side when the reply arrives. | |
740 | * | |
741 | * Return 0 on success or negative error code on failure. | |
742 | */ | |
743 | static int i2o_block_transfer(struct request *req) | |
744 | { | |
745 | struct i2o_block_device *dev = req->rq_disk->private_data; | |
f10378ff | 746 | struct i2o_controller *c; |
1da177e4 LT |
747 | int tid = dev->i2o_dev->lct_data.tid; |
748 | struct i2o_message __iomem *msg; | |
f10378ff | 749 | u32 __iomem *mptr; |
1da177e4 | 750 | struct i2o_block_request *ireq = req->special; |
1da177e4 LT |
751 | u32 m; |
752 | u32 tcntxt; | |
f10378ff ML |
753 | u32 sgl_offset = SGL_OFFSET_8; |
754 | u32 ctl_flags = 0x00000000; | |
1da177e4 | 755 | int rc; |
f10378ff ML |
756 | u32 cmd; |
757 | ||
758 | if (unlikely(!dev->i2o_dev)) { | |
759 | osm_err("transfer to removed drive\n"); | |
760 | rc = -ENODEV; | |
761 | goto exit; | |
762 | } | |
763 | ||
764 | c = dev->i2o_dev->iop; | |
1da177e4 LT |
765 | |
766 | m = i2o_msg_get(c, &msg); | |
767 | if (m == I2O_QUEUE_EMPTY) { | |
768 | rc = -EBUSY; | |
769 | goto exit; | |
770 | } | |
771 | ||
772 | tcntxt = i2o_cntxt_list_add(c, req); | |
773 | if (!tcntxt) { | |
774 | rc = -ENOMEM; | |
775 | goto nop_msg; | |
776 | } | |
777 | ||
1da177e4 LT |
778 | writel(i2o_block_driver.context, &msg->u.s.icntxt); |
779 | writel(tcntxt, &msg->u.s.tcntxt); | |
1da177e4 | 780 | |
f10378ff | 781 | mptr = &msg->body[0]; |
1da177e4 LT |
782 | |
783 | if (rq_data_dir(req) == READ) { | |
f10378ff ML |
784 | cmd = I2O_CMD_BLOCK_READ << 24; |
785 | ||
1da177e4 | 786 | switch (dev->rcache) { |
1da177e4 | 787 | case CACHE_PREFETCH: |
f10378ff | 788 | ctl_flags = 0x201F0008; |
1da177e4 | 789 | break; |
f10378ff | 790 | |
1da177e4 LT |
791 | case CACHE_SMARTFETCH: |
792 | if (req->nr_sectors > 16) | |
f10378ff | 793 | ctl_flags = 0x201F0008; |
1da177e4 | 794 | else |
f10378ff ML |
795 | ctl_flags = 0x001F0000; |
796 | break; | |
797 | ||
798 | default: | |
1da177e4 LT |
799 | break; |
800 | } | |
801 | } else { | |
f10378ff ML |
802 | cmd = I2O_CMD_BLOCK_WRITE << 24; |
803 | ||
1da177e4 | 804 | switch (dev->wcache) { |
1da177e4 | 805 | case CACHE_WRITETHROUGH: |
f10378ff | 806 | ctl_flags = 0x001F0008; |
1da177e4 LT |
807 | break; |
808 | case CACHE_WRITEBACK: | |
f10378ff | 809 | ctl_flags = 0x001F0010; |
1da177e4 LT |
810 | break; |
811 | case CACHE_SMARTBACK: | |
812 | if (req->nr_sectors > 16) | |
f10378ff | 813 | ctl_flags = 0x001F0004; |
1da177e4 | 814 | else |
f10378ff | 815 | ctl_flags = 0x001F0010; |
1da177e4 LT |
816 | break; |
817 | case CACHE_SMARTTHROUGH: | |
818 | if (req->nr_sectors > 16) | |
f10378ff | 819 | ctl_flags = 0x001F0004; |
1da177e4 | 820 | else |
f10378ff ML |
821 | ctl_flags = 0x001F0010; |
822 | default: | |
823 | break; | |
824 | } | |
825 | } | |
826 | ||
827 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
828 | if (c->adaptec) { | |
829 | u8 cmd[10]; | |
830 | u32 scsi_flags; | |
831 | u16 hwsec = queue_hardsect_size(req->q) >> KERNEL_SECTOR_SHIFT; | |
832 | ||
833 | memset(cmd, 0, 10); | |
834 | ||
835 | sgl_offset = SGL_OFFSET_12; | |
836 | ||
837 | writel(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid, | |
838 | &msg->u.head[1]); | |
839 | ||
840 | writel(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC, mptr++); | |
841 | writel(tid, mptr++); | |
842 | ||
843 | /* | |
844 | * ENABLE_DISCONNECT | |
845 | * SIMPLE_TAG | |
846 | * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME | |
847 | */ | |
848 | if (rq_data_dir(req) == READ) { | |
849 | cmd[0] = 0x28; | |
850 | scsi_flags = 0x60a0000a; | |
851 | } else { | |
852 | cmd[0] = 0x2A; | |
853 | scsi_flags = 0xa0a0000a; | |
1da177e4 | 854 | } |
f10378ff ML |
855 | |
856 | writel(scsi_flags, mptr++); | |
857 | ||
858 | *((u32 *) & cmd[2]) = cpu_to_be32(req->sector * hwsec); | |
859 | *((u16 *) & cmd[7]) = cpu_to_be16(req->nr_sectors * hwsec); | |
860 | ||
861 | memcpy_toio(mptr, cmd, 10); | |
862 | mptr += 4; | |
863 | writel(req->nr_sectors << KERNEL_SECTOR_SHIFT, mptr++); | |
864 | } else | |
865 | #endif | |
866 | { | |
867 | writel(cmd | HOST_TID << 12 | tid, &msg->u.head[1]); | |
868 | writel(ctl_flags, mptr++); | |
869 | writel(req->nr_sectors << KERNEL_SECTOR_SHIFT, mptr++); | |
870 | writel((u32) (req->sector << KERNEL_SECTOR_SHIFT), mptr++); | |
871 | writel(req->sector >> (32 - KERNEL_SECTOR_SHIFT), mptr++); | |
1da177e4 LT |
872 | } |
873 | ||
f10378ff ML |
874 | if (!i2o_block_sglist_alloc(c, ireq, &mptr)) { |
875 | rc = -ENOMEM; | |
876 | goto context_remove; | |
1da177e4 LT |
877 | } |
878 | ||
f10378ff ML |
879 | writel(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | |
880 | sgl_offset, &msg->u.head[0]); | |
1da177e4 LT |
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 | ||
f10378ff | 923 | if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) { |
1da177e4 LT |
924 | if (!i2o_block_transfer(req)) { |
925 | blkdev_dequeue_request(req); | |
926 | continue; | |
f10378ff ML |
927 | } else |
928 | osm_info("transfer error\n"); | |
929 | } | |
1da177e4 LT |
930 | |
931 | if (queue_depth) | |
932 | break; | |
933 | ||
934 | /* stop the queue and retry later */ | |
935 | dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC); | |
936 | if (!dreq) | |
937 | continue; | |
938 | ||
939 | dreq->queue = q; | |
940 | INIT_WORK(&dreq->work, i2o_block_delayed_request_fn, | |
941 | dreq); | |
942 | ||
1da177e4 LT |
943 | if (!queue_delayed_work(i2o_block_driver.event_queue, |
944 | &dreq->work, | |
945 | I2O_BLOCK_RETRY_TIME)) | |
946 | kfree(dreq); | |
947 | else { | |
948 | blk_stop_queue(q); | |
949 | break; | |
950 | } | |
951 | } else | |
952 | end_request(req, 0); | |
953 | } | |
954 | }; | |
955 | ||
956 | /* I2O Block device operations definition */ | |
957 | static struct block_device_operations i2o_block_fops = { | |
958 | .owner = THIS_MODULE, | |
959 | .open = i2o_block_open, | |
960 | .release = i2o_block_release, | |
961 | .ioctl = i2o_block_ioctl, | |
962 | .media_changed = i2o_block_media_changed | |
963 | }; | |
964 | ||
965 | /** | |
966 | * i2o_block_device_alloc - Allocate memory for a I2O Block device | |
967 | * | |
968 | * Allocate memory for the i2o_block_device struct, gendisk and request | |
969 | * queue and initialize them as far as no additional information is needed. | |
970 | * | |
971 | * Returns a pointer to the allocated I2O Block device on succes or a | |
972 | * negative error code on failure. | |
973 | */ | |
974 | static struct i2o_block_device *i2o_block_device_alloc(void) | |
975 | { | |
976 | struct i2o_block_device *dev; | |
977 | struct gendisk *gd; | |
978 | struct request_queue *queue; | |
979 | int rc; | |
980 | ||
981 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
982 | if (!dev) { | |
983 | osm_err("Insufficient memory to allocate I2O Block disk.\n"); | |
984 | rc = -ENOMEM; | |
985 | goto exit; | |
986 | } | |
987 | memset(dev, 0, sizeof(*dev)); | |
988 | ||
989 | INIT_LIST_HEAD(&dev->open_queue); | |
990 | spin_lock_init(&dev->lock); | |
991 | dev->rcache = CACHE_PREFETCH; | |
992 | dev->wcache = CACHE_WRITEBACK; | |
993 | ||
994 | /* allocate a gendisk with 16 partitions */ | |
995 | gd = alloc_disk(16); | |
996 | if (!gd) { | |
997 | osm_err("Insufficient memory to allocate gendisk.\n"); | |
998 | rc = -ENOMEM; | |
999 | goto cleanup_dev; | |
1000 | } | |
1001 | ||
1002 | /* initialize the request queue */ | |
1003 | queue = blk_init_queue(i2o_block_request_fn, &dev->lock); | |
1004 | if (!queue) { | |
1005 | osm_err("Insufficient memory to allocate request queue.\n"); | |
1006 | rc = -ENOMEM; | |
1007 | goto cleanup_queue; | |
1008 | } | |
1009 | ||
1010 | blk_queue_prep_rq(queue, i2o_block_prep_req_fn); | |
f10378ff | 1011 | blk_queue_issue_flush_fn(queue, i2o_block_issue_flush); |
1da177e4 LT |
1012 | |
1013 | gd->major = I2O_MAJOR; | |
1014 | gd->queue = queue; | |
1015 | gd->fops = &i2o_block_fops; | |
1016 | gd->private_data = dev; | |
1017 | ||
1018 | dev->gd = gd; | |
1019 | ||
1020 | return dev; | |
1021 | ||
1022 | cleanup_queue: | |
1023 | put_disk(gd); | |
1024 | ||
1025 | cleanup_dev: | |
1026 | kfree(dev); | |
1027 | ||
1028 | exit: | |
1029 | return ERR_PTR(rc); | |
1030 | }; | |
1031 | ||
1032 | /** | |
1033 | * i2o_block_probe - verify if dev is a I2O Block device and install it | |
1034 | * @dev: device to verify if it is a I2O Block device | |
1035 | * | |
1036 | * We only verify if the user_tid of the device is 0xfff and then install | |
1037 | * the device. Otherwise it is used by some other device (e. g. RAID). | |
1038 | * | |
1039 | * Returns 0 on success or negative error code on failure. | |
1040 | */ | |
1041 | static int i2o_block_probe(struct device *dev) | |
1042 | { | |
1043 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
1da177e4 | 1044 | struct i2o_controller *c = i2o_dev->iop; |
f33213ec | 1045 | struct i2o_block_device *i2o_blk_dev; |
1da177e4 LT |
1046 | struct gendisk *gd; |
1047 | struct request_queue *queue; | |
1048 | static int unit = 0; | |
1049 | int rc; | |
1050 | u64 size; | |
1051 | u32 blocksize; | |
1da177e4 | 1052 | u32 flags, status; |
f10378ff ML |
1053 | u16 body_size = 4; |
1054 | unsigned short max_sectors; | |
1055 | ||
1056 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
1057 | if (c->adaptec) | |
1058 | body_size = 8; | |
1059 | #endif | |
1060 | ||
1061 | if (c->limit_sectors) | |
1062 | max_sectors = I2O_MAX_SECTORS_LIMITED; | |
1063 | else | |
1064 | max_sectors = I2O_MAX_SECTORS; | |
1da177e4 LT |
1065 | |
1066 | /* skip devices which are used by IOP */ | |
1067 | if (i2o_dev->lct_data.user_tid != 0xfff) { | |
1068 | osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid); | |
1069 | return -ENODEV; | |
1070 | } | |
1071 | ||
1da177e4 LT |
1072 | if (i2o_device_claim(i2o_dev)) { |
1073 | osm_warn("Unable to claim device. Installation aborted\n"); | |
1074 | rc = -EFAULT; | |
1075 | goto exit; | |
1076 | } | |
1077 | ||
1078 | i2o_blk_dev = i2o_block_device_alloc(); | |
1079 | if (IS_ERR(i2o_blk_dev)) { | |
1080 | osm_err("could not alloc a new I2O block device"); | |
1081 | rc = PTR_ERR(i2o_blk_dev); | |
1082 | goto claim_release; | |
1083 | } | |
1084 | ||
1085 | i2o_blk_dev->i2o_dev = i2o_dev; | |
1086 | dev_set_drvdata(dev, i2o_blk_dev); | |
1087 | ||
1088 | /* setup gendisk */ | |
1089 | gd = i2o_blk_dev->gd; | |
1090 | gd->first_minor = unit << 4; | |
1091 | sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit); | |
1092 | sprintf(gd->devfs_name, "i2o/hd%c", 'a' + unit); | |
1093 | gd->driverfs_dev = &i2o_dev->device; | |
1094 | ||
1095 | /* setup request queue */ | |
1096 | queue = gd->queue; | |
1097 | queue->queuedata = i2o_blk_dev; | |
1098 | ||
f10378ff ML |
1099 | blk_queue_max_phys_segments(queue, I2O_MAX_PHYS_SEGMENTS); |
1100 | blk_queue_max_sectors(queue, max_sectors); | |
1101 | blk_queue_max_hw_segments(queue, i2o_sg_tablesize(c, body_size)); | |
1da177e4 | 1102 | |
f10378ff ML |
1103 | osm_debug("max sectors = %d\n", queue->max_phys_segments); |
1104 | osm_debug("phys segments = %d\n", queue->max_sectors); | |
1105 | osm_debug("max hw segments = %d\n", queue->max_hw_segments); | |
1da177e4 LT |
1106 | |
1107 | /* | |
1108 | * Ask for the current media data. If that isn't supported | |
1109 | * then we ask for the device capacity data | |
1110 | */ | |
f10378ff ML |
1111 | if (i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) || |
1112 | i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) { | |
1113 | blk_queue_hardsect_size(queue, blocksize); | |
1114 | } else | |
1115 | osm_warn("unable to get blocksize of %s\n", gd->disk_name); | |
1da177e4 | 1116 | |
f10378ff ML |
1117 | if (i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) || |
1118 | i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) { | |
1119 | set_capacity(gd, size >> KERNEL_SECTOR_SHIFT); | |
1120 | } else | |
1121 | osm_warn("could not get size of %s\n", gd->disk_name); | |
f88e119c ML |
1122 | |
1123 | if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &i2o_blk_dev->power, 2)) | |
1124 | i2o_blk_dev->power = 0; | |
1da177e4 LT |
1125 | i2o_parm_field_get(i2o_dev, 0x0000, 5, &flags, 4); |
1126 | i2o_parm_field_get(i2o_dev, 0x0000, 6, &status, 4); | |
1127 | ||
1da177e4 LT |
1128 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff); |
1129 | ||
1130 | add_disk(gd); | |
1131 | ||
1132 | unit++; | |
1133 | ||
f88e119c ML |
1134 | osm_info("device added (TID: %03x): %s\n", i2o_dev->lct_data.tid, |
1135 | i2o_blk_dev->gd->disk_name); | |
1136 | ||
1da177e4 LT |
1137 | return 0; |
1138 | ||
1139 | claim_release: | |
1140 | i2o_device_claim_release(i2o_dev); | |
1141 | ||
1142 | exit: | |
1143 | return rc; | |
1144 | }; | |
1145 | ||
1146 | /* Block OSM driver struct */ | |
1147 | static struct i2o_driver i2o_block_driver = { | |
1148 | .name = OSM_NAME, | |
1149 | .event = i2o_block_event, | |
1150 | .reply = i2o_block_reply, | |
1151 | .classes = i2o_block_class_id, | |
1152 | .driver = { | |
1153 | .probe = i2o_block_probe, | |
1154 | .remove = i2o_block_remove, | |
1155 | }, | |
1156 | }; | |
1157 | ||
1158 | /** | |
1159 | * i2o_block_init - Block OSM initialization function | |
1160 | * | |
1161 | * Allocate the slab and mempool for request structs, registers i2o_block | |
1162 | * block device and finally register the Block OSM in the I2O core. | |
1163 | * | |
1164 | * Returns 0 on success or negative error code on failure. | |
1165 | */ | |
1166 | static int __init i2o_block_init(void) | |
1167 | { | |
1168 | int rc; | |
1169 | int size; | |
1170 | ||
1171 | printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); | |
1172 | ||
1173 | /* Allocate request mempool and slab */ | |
1174 | size = sizeof(struct i2o_block_request); | |
1175 | i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0, | |
1176 | SLAB_HWCACHE_ALIGN, NULL, | |
1177 | NULL); | |
1178 | if (!i2o_blk_req_pool.slab) { | |
1179 | osm_err("can't init request slab\n"); | |
1180 | rc = -ENOMEM; | |
1181 | goto exit; | |
1182 | } | |
1183 | ||
f10378ff | 1184 | i2o_blk_req_pool.pool = mempool_create(I2O_BLOCK_REQ_MEMPOOL_SIZE, |
1da177e4 LT |
1185 | mempool_alloc_slab, |
1186 | mempool_free_slab, | |
1187 | i2o_blk_req_pool.slab); | |
1188 | if (!i2o_blk_req_pool.pool) { | |
1189 | osm_err("can't init request mempool\n"); | |
1190 | rc = -ENOMEM; | |
1191 | goto free_slab; | |
1192 | } | |
1193 | ||
1194 | /* Register the block device interfaces */ | |
1195 | rc = register_blkdev(I2O_MAJOR, "i2o_block"); | |
1196 | if (rc) { | |
1197 | osm_err("unable to register block device\n"); | |
1198 | goto free_mempool; | |
1199 | } | |
1200 | #ifdef MODULE | |
1201 | osm_info("registered device at major %d\n", I2O_MAJOR); | |
1202 | #endif | |
1203 | ||
1204 | /* Register Block OSM into I2O core */ | |
1205 | rc = i2o_driver_register(&i2o_block_driver); | |
1206 | if (rc) { | |
1207 | osm_err("Could not register Block driver\n"); | |
1208 | goto unregister_blkdev; | |
1209 | } | |
1210 | ||
1211 | return 0; | |
1212 | ||
1213 | unregister_blkdev: | |
1214 | unregister_blkdev(I2O_MAJOR, "i2o_block"); | |
1215 | ||
1216 | free_mempool: | |
1217 | mempool_destroy(i2o_blk_req_pool.pool); | |
1218 | ||
1219 | free_slab: | |
1220 | kmem_cache_destroy(i2o_blk_req_pool.slab); | |
1221 | ||
1222 | exit: | |
1223 | return rc; | |
1224 | }; | |
1225 | ||
1226 | /** | |
1227 | * i2o_block_exit - Block OSM exit function | |
1228 | * | |
1229 | * Unregisters Block OSM from I2O core, unregisters i2o_block block device | |
1230 | * and frees the mempool and slab. | |
1231 | */ | |
1232 | static void __exit i2o_block_exit(void) | |
1233 | { | |
1234 | /* Unregister I2O Block OSM from I2O core */ | |
1235 | i2o_driver_unregister(&i2o_block_driver); | |
1236 | ||
1237 | /* Unregister block device */ | |
1238 | unregister_blkdev(I2O_MAJOR, "i2o_block"); | |
1239 | ||
1240 | /* Free request mempool and slab */ | |
1241 | mempool_destroy(i2o_blk_req_pool.pool); | |
1242 | kmem_cache_destroy(i2o_blk_req_pool.slab); | |
1243 | }; | |
1244 | ||
1245 | MODULE_AUTHOR("Red Hat"); | |
1246 | MODULE_LICENSE("GPL"); | |
1247 | MODULE_DESCRIPTION(OSM_DESCRIPTION); | |
1248 | MODULE_VERSION(OSM_VERSION); | |
1249 | ||
1250 | module_init(i2o_block_init); | |
1251 | module_exit(i2o_block_exit); |