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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 | ||
2e1973a3 ML |
62 | #include <scsi/scsi.h> |
63 | ||
1da177e4 LT |
64 | #include "i2o_block.h" |
65 | ||
66 | #define OSM_NAME "block-osm" | |
f6ed39a6 | 67 | #define OSM_VERSION "1.325" |
1da177e4 LT |
68 | #define OSM_DESCRIPTION "I2O Block Device OSM" |
69 | ||
70 | static struct i2o_driver i2o_block_driver; | |
71 | ||
72 | /* global Block OSM request mempool */ | |
73 | static struct i2o_block_mempool i2o_blk_req_pool; | |
74 | ||
75 | /* Block OSM class handling definition */ | |
76 | static struct i2o_class_id i2o_block_class_id[] = { | |
77 | {I2O_CLASS_RANDOM_BLOCK_STORAGE}, | |
78 | {I2O_CLASS_END} | |
79 | }; | |
80 | ||
81 | /** | |
82 | * i2o_block_device_free - free the memory of the I2O Block device | |
83 | * @dev: I2O Block device, which should be cleaned up | |
84 | * | |
85 | * Frees the request queue, gendisk and the i2o_block_device structure. | |
86 | */ | |
87 | static void i2o_block_device_free(struct i2o_block_device *dev) | |
88 | { | |
89 | blk_cleanup_queue(dev->gd->queue); | |
90 | ||
91 | put_disk(dev->gd); | |
92 | ||
93 | kfree(dev); | |
94 | }; | |
95 | ||
96 | /** | |
97 | * i2o_block_remove - remove the I2O Block device from the system again | |
98 | * @dev: I2O Block device which should be removed | |
99 | * | |
100 | * Remove gendisk from system and free all allocated memory. | |
101 | * | |
102 | * Always returns 0. | |
103 | */ | |
104 | static int i2o_block_remove(struct device *dev) | |
105 | { | |
106 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
107 | struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev); | |
108 | ||
f88e119c ML |
109 | osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid, |
110 | i2o_blk_dev->gd->disk_name); | |
1da177e4 LT |
111 | |
112 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0); | |
113 | ||
114 | del_gendisk(i2o_blk_dev->gd); | |
115 | ||
116 | dev_set_drvdata(dev, NULL); | |
117 | ||
118 | i2o_device_claim_release(i2o_dev); | |
119 | ||
120 | i2o_block_device_free(i2o_blk_dev); | |
121 | ||
122 | return 0; | |
123 | }; | |
124 | ||
125 | /** | |
126 | * i2o_block_device flush - Flush all dirty data of I2O device dev | |
127 | * @dev: I2O device which should be flushed | |
128 | * | |
129 | * Flushes all dirty data on device dev. | |
130 | * | |
131 | * Returns 0 on success or negative error code on failure. | |
132 | */ | |
133 | static int i2o_block_device_flush(struct i2o_device *dev) | |
134 | { | |
a1a5ea70 | 135 | struct i2o_message *msg; |
1da177e4 | 136 | |
a1a5ea70 ML |
137 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); |
138 | if (IS_ERR(msg)) | |
139 | return PTR_ERR(msg); | |
1da177e4 | 140 | |
a1a5ea70 ML |
141 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
142 | msg->u.head[1] = | |
143 | cpu_to_le32(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev-> | |
144 | lct_data.tid); | |
145 | msg->body[0] = cpu_to_le32(60 << 16); | |
1da177e4 LT |
146 | osm_debug("Flushing...\n"); |
147 | ||
a1a5ea70 | 148 | return i2o_msg_post_wait(dev->iop, msg, 60); |
1da177e4 LT |
149 | }; |
150 | ||
151 | /** | |
152 | * i2o_block_device_mount - Mount (load) the media of device dev | |
153 | * @dev: I2O device which should receive the mount request | |
154 | * @media_id: Media Identifier | |
155 | * | |
156 | * Load a media into drive. Identifier should be set to -1, because the | |
157 | * spec does not support any other value. | |
158 | * | |
159 | * Returns 0 on success or negative error code on failure. | |
160 | */ | |
161 | static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id) | |
162 | { | |
a1a5ea70 ML |
163 | struct i2o_message *msg; |
164 | ||
165 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); | |
166 | if (IS_ERR(msg)) | |
167 | return PTR_ERR(msg); | |
168 | ||
169 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); | |
170 | msg->u.head[1] = | |
171 | cpu_to_le32(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev-> | |
172 | lct_data.tid); | |
173 | msg->body[0] = cpu_to_le32(-1); | |
174 | msg->body[1] = cpu_to_le32(0x00000000); | |
1da177e4 LT |
175 | osm_debug("Mounting...\n"); |
176 | ||
a1a5ea70 | 177 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
178 | }; |
179 | ||
180 | /** | |
181 | * i2o_block_device_lock - Locks the media of device dev | |
182 | * @dev: I2O device which should receive the lock request | |
183 | * @media_id: Media Identifier | |
184 | * | |
185 | * Lock media of device dev to prevent removal. The media identifier | |
186 | * should be set to -1, because the spec does not support any other value. | |
187 | * | |
188 | * Returns 0 on success or negative error code on failure. | |
189 | */ | |
190 | static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) | |
191 | { | |
a1a5ea70 | 192 | struct i2o_message *msg; |
1da177e4 | 193 | |
a1a5ea70 | 194 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); |
010904cb | 195 | if (IS_ERR(msg)) |
a1a5ea70 | 196 | return PTR_ERR(msg); |
1da177e4 | 197 | |
a1a5ea70 ML |
198 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
199 | msg->u.head[1] = | |
200 | cpu_to_le32(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev-> | |
201 | lct_data.tid); | |
202 | msg->body[0] = cpu_to_le32(-1); | |
1da177e4 LT |
203 | osm_debug("Locking...\n"); |
204 | ||
a1a5ea70 | 205 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
206 | }; |
207 | ||
208 | /** | |
209 | * i2o_block_device_unlock - Unlocks the media of device dev | |
210 | * @dev: I2O device which should receive the unlocked request | |
211 | * @media_id: Media Identifier | |
212 | * | |
213 | * Unlocks the media in device dev. The media identifier should be set to | |
214 | * -1, because the spec does not support any other value. | |
215 | * | |
216 | * Returns 0 on success or negative error code on failure. | |
217 | */ | |
218 | static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id) | |
219 | { | |
a1a5ea70 | 220 | struct i2o_message *msg; |
1da177e4 | 221 | |
a1a5ea70 ML |
222 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); |
223 | if (IS_ERR(msg)) | |
224 | return PTR_ERR(msg); | |
1da177e4 | 225 | |
a1a5ea70 ML |
226 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
227 | msg->u.head[1] = | |
228 | cpu_to_le32(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev-> | |
229 | lct_data.tid); | |
230 | msg->body[0] = cpu_to_le32(media_id); | |
1da177e4 LT |
231 | osm_debug("Unlocking...\n"); |
232 | ||
a1a5ea70 | 233 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
234 | }; |
235 | ||
236 | /** | |
237 | * i2o_block_device_power - Power management for device dev | |
238 | * @dev: I2O device which should receive the power management request | |
d9489fb6 | 239 | * @op: Operation to send |
1da177e4 LT |
240 | * |
241 | * Send a power management request to the device dev. | |
242 | * | |
243 | * Returns 0 on success or negative error code on failure. | |
244 | */ | |
245 | static int i2o_block_device_power(struct i2o_block_device *dev, u8 op) | |
246 | { | |
247 | struct i2o_device *i2o_dev = dev->i2o_dev; | |
248 | struct i2o_controller *c = i2o_dev->iop; | |
a1a5ea70 | 249 | struct i2o_message *msg; |
1da177e4 LT |
250 | int rc; |
251 | ||
a1a5ea70 ML |
252 | msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); |
253 | if (IS_ERR(msg)) | |
254 | return PTR_ERR(msg); | |
1da177e4 | 255 | |
a1a5ea70 ML |
256 | msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0); |
257 | msg->u.head[1] = | |
258 | cpu_to_le32(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev-> | |
259 | lct_data.tid); | |
260 | msg->body[0] = cpu_to_le32(op << 24); | |
1da177e4 LT |
261 | osm_debug("Power...\n"); |
262 | ||
a1a5ea70 | 263 | rc = i2o_msg_post_wait(c, msg, 60); |
1da177e4 LT |
264 | if (!rc) |
265 | dev->power = op; | |
266 | ||
267 | return rc; | |
268 | }; | |
269 | ||
270 | /** | |
271 | * i2o_block_request_alloc - Allocate an I2O block request struct | |
272 | * | |
273 | * Allocates an I2O block request struct and initialize the list. | |
274 | * | |
275 | * Returns a i2o_block_request pointer on success or negative error code | |
276 | * on failure. | |
277 | */ | |
278 | static inline struct i2o_block_request *i2o_block_request_alloc(void) | |
279 | { | |
280 | struct i2o_block_request *ireq; | |
281 | ||
282 | ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC); | |
283 | if (!ireq) | |
284 | return ERR_PTR(-ENOMEM); | |
285 | ||
286 | INIT_LIST_HEAD(&ireq->queue); | |
3d1266c7 | 287 | sg_init_table(ireq->sg_table, I2O_MAX_PHYS_SEGMENTS); |
1da177e4 LT |
288 | |
289 | return ireq; | |
290 | }; | |
291 | ||
292 | /** | |
293 | * i2o_block_request_free - Frees a I2O block request | |
294 | * @ireq: I2O block request which should be freed | |
295 | * | |
d9489fb6 | 296 | * Frees the allocated memory (give it back to the request mempool). |
1da177e4 LT |
297 | */ |
298 | static inline void i2o_block_request_free(struct i2o_block_request *ireq) | |
299 | { | |
300 | mempool_free(ireq, i2o_blk_req_pool.pool); | |
301 | }; | |
302 | ||
303 | /** | |
304 | * i2o_block_sglist_alloc - Allocate the SG list and map it | |
f10378ff | 305 | * @c: I2O controller to which the request belongs |
1da177e4 | 306 | * @ireq: I2O block request |
d9489fb6 | 307 | * @mptr: message body pointer |
1da177e4 | 308 | * |
f10378ff | 309 | * Builds the SG list and map it to be accessable by the controller. |
1da177e4 | 310 | * |
f10378ff | 311 | * Returns 0 on failure or 1 on success. |
1da177e4 | 312 | */ |
f10378ff ML |
313 | static inline int i2o_block_sglist_alloc(struct i2o_controller *c, |
314 | struct i2o_block_request *ireq, | |
a1a5ea70 | 315 | u32 ** mptr) |
1da177e4 | 316 | { |
1da177e4 | 317 | int nents; |
f10378ff | 318 | enum dma_data_direction direction; |
1da177e4 | 319 | |
f10378ff | 320 | ireq->dev = &c->pdev->dev; |
1da177e4 LT |
321 | nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table); |
322 | ||
323 | if (rq_data_dir(ireq->req) == READ) | |
f10378ff | 324 | direction = PCI_DMA_FROMDEVICE; |
1da177e4 | 325 | else |
f10378ff | 326 | direction = PCI_DMA_TODEVICE; |
1da177e4 | 327 | |
f10378ff | 328 | ireq->sg_nents = nents; |
1da177e4 | 329 | |
f10378ff | 330 | return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr); |
1da177e4 LT |
331 | }; |
332 | ||
333 | /** | |
334 | * i2o_block_sglist_free - Frees the SG list | |
335 | * @ireq: I2O block request from which the SG should be freed | |
336 | * | |
337 | * Frees the SG list from the I2O block request. | |
338 | */ | |
339 | static inline void i2o_block_sglist_free(struct i2o_block_request *ireq) | |
340 | { | |
f10378ff | 341 | enum dma_data_direction direction; |
1da177e4 | 342 | |
f10378ff ML |
343 | if (rq_data_dir(ireq->req) == READ) |
344 | direction = PCI_DMA_FROMDEVICE; | |
345 | else | |
346 | direction = PCI_DMA_TODEVICE; | |
347 | ||
348 | dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction); | |
1da177e4 LT |
349 | }; |
350 | ||
351 | /** | |
352 | * i2o_block_prep_req_fn - Allocates I2O block device specific struct | |
353 | * @q: request queue for the request | |
354 | * @req: the request to prepare | |
355 | * | |
356 | * Allocate the necessary i2o_block_request struct and connect it to | |
5e333309 | 357 | * the request. This is needed that we not lose the SG list later on. |
1da177e4 LT |
358 | * |
359 | * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure. | |
360 | */ | |
361 | static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req) | |
362 | { | |
363 | struct i2o_block_device *i2o_blk_dev = q->queuedata; | |
364 | struct i2o_block_request *ireq; | |
365 | ||
f10378ff ML |
366 | if (unlikely(!i2o_blk_dev)) { |
367 | osm_err("block device already removed\n"); | |
368 | return BLKPREP_KILL; | |
369 | } | |
370 | ||
1da177e4 LT |
371 | /* connect the i2o_block_request to the request */ |
372 | if (!req->special) { | |
373 | ireq = i2o_block_request_alloc(); | |
801678c5 | 374 | if (IS_ERR(ireq)) { |
1da177e4 LT |
375 | osm_debug("unable to allocate i2o_block_request!\n"); |
376 | return BLKPREP_DEFER; | |
377 | } | |
378 | ||
379 | ireq->i2o_blk_dev = i2o_blk_dev; | |
380 | req->special = ireq; | |
381 | ireq->req = req; | |
d1985ad1 | 382 | } |
1da177e4 | 383 | /* do not come back here */ |
4aff5e23 | 384 | req->cmd_flags |= REQ_DONTPREP; |
1da177e4 LT |
385 | |
386 | return BLKPREP_OK; | |
387 | }; | |
388 | ||
389 | /** | |
390 | * i2o_block_delayed_request_fn - delayed request queue function | |
c4028958 | 391 | * @work: the delayed request with the queue to start |
1da177e4 LT |
392 | * |
393 | * If the request queue is stopped for a disk, and there is no open | |
394 | * request, a new event is created, which calls this function to start | |
395 | * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never | |
396 | * be started again. | |
397 | */ | |
c4028958 | 398 | static void i2o_block_delayed_request_fn(struct work_struct *work) |
1da177e4 | 399 | { |
c4028958 DH |
400 | struct i2o_block_delayed_request *dreq = |
401 | container_of(work, struct i2o_block_delayed_request, | |
402 | work.work); | |
1da177e4 LT |
403 | struct request_queue *q = dreq->queue; |
404 | unsigned long flags; | |
405 | ||
406 | spin_lock_irqsave(q->queue_lock, flags); | |
407 | blk_start_queue(q); | |
408 | spin_unlock_irqrestore(q->queue_lock, flags); | |
409 | kfree(dreq); | |
410 | }; | |
411 | ||
412 | /** | |
f88e119c ML |
413 | * i2o_block_end_request - Post-processing of completed commands |
414 | * @req: request which should be completed | |
1381b7e8 | 415 | * @error: 0 for success, < 0 for error |
f88e119c | 416 | * @nr_bytes: number of bytes to complete |
1da177e4 | 417 | * |
f88e119c | 418 | * Mark the request as complete. The lock must not be held when entering. |
1da177e4 LT |
419 | * |
420 | */ | |
1381b7e8 | 421 | static void i2o_block_end_request(struct request *req, int error, |
f88e119c | 422 | int nr_bytes) |
1da177e4 | 423 | { |
f88e119c ML |
424 | struct i2o_block_request *ireq = req->special; |
425 | struct i2o_block_device *dev = ireq->i2o_blk_dev; | |
165125e1 | 426 | struct request_queue *q = req->q; |
1da177e4 LT |
427 | unsigned long flags; |
428 | ||
1011c1b9 | 429 | if (blk_end_request(req, error, nr_bytes)) |
1381b7e8 | 430 | if (error) |
1011c1b9 | 431 | blk_end_request_all(req, -EIO); |
1da177e4 | 432 | |
f88e119c | 433 | spin_lock_irqsave(q->queue_lock, flags); |
1da177e4 | 434 | |
f10378ff ML |
435 | if (likely(dev)) { |
436 | dev->open_queue_depth--; | |
437 | list_del(&ireq->queue); | |
438 | } | |
1da177e4 | 439 | |
f88e119c | 440 | blk_start_queue(q); |
1da177e4 | 441 | |
f88e119c | 442 | spin_unlock_irqrestore(q->queue_lock, flags); |
1da177e4 | 443 | |
f88e119c ML |
444 | i2o_block_sglist_free(ireq); |
445 | i2o_block_request_free(ireq); | |
446 | }; | |
1da177e4 | 447 | |
f88e119c ML |
448 | /** |
449 | * i2o_block_reply - Block OSM reply handler. | |
450 | * @c: I2O controller from which the message arrives | |
451 | * @m: message id of reply | |
d9489fb6 | 452 | * @msg: the actual I2O message reply |
f88e119c ML |
453 | * |
454 | * This function gets all the message replies. | |
455 | * | |
456 | */ | |
457 | static int i2o_block_reply(struct i2o_controller *c, u32 m, | |
458 | struct i2o_message *msg) | |
459 | { | |
460 | struct request *req; | |
1381b7e8 | 461 | int error = 0; |
1da177e4 LT |
462 | |
463 | req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); | |
464 | if (unlikely(!req)) { | |
465 | osm_err("NULL reply received!\n"); | |
466 | return -1; | |
467 | } | |
468 | ||
1da177e4 LT |
469 | /* |
470 | * Lets see what is cooking. We stuffed the | |
471 | * request in the context. | |
472 | */ | |
473 | ||
f88e119c ML |
474 | if ((le32_to_cpu(msg->body[0]) >> 24) != 0) { |
475 | u32 status = le32_to_cpu(msg->body[0]); | |
1da177e4 LT |
476 | /* |
477 | * Device not ready means two things. One is that the | |
478 | * the thing went offline (but not a removal media) | |
479 | * | |
480 | * The second is that you have a SuperTrak 100 and the | |
481 | * firmware got constipated. Unlike standard i2o card | |
482 | * setups the supertrak returns an error rather than | |
483 | * blocking for the timeout in these cases. | |
484 | * | |
485 | * Don't stick a supertrak100 into cache aggressive modes | |
486 | */ | |
487 | ||
f10378ff ML |
488 | osm_err("TID %03x error status: 0x%02x, detailed status: " |
489 | "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff), | |
f88e119c | 490 | status >> 24, status & 0xffff); |
1da177e4 | 491 | |
f88e119c | 492 | req->errors++; |
1da177e4 | 493 | |
1381b7e8 | 494 | error = -EIO; |
f88e119c | 495 | } |
1da177e4 | 496 | |
1381b7e8 | 497 | i2o_block_end_request(req, error, le32_to_cpu(msg->body[1])); |
1da177e4 LT |
498 | |
499 | return 1; | |
500 | }; | |
501 | ||
c4028958 | 502 | static void i2o_block_event(struct work_struct *work) |
1da177e4 | 503 | { |
c4028958 | 504 | struct i2o_event *evt = container_of(work, struct i2o_event, work); |
9e87545f | 505 | osm_debug("event received\n"); |
223230e7 | 506 | kfree(evt); |
1da177e4 LT |
507 | }; |
508 | ||
509 | /* | |
510 | * SCSI-CAM for ioctl geometry mapping | |
511 | * Duplicated with SCSI - this should be moved into somewhere common | |
512 | * perhaps genhd ? | |
513 | * | |
514 | * LBA -> CHS mapping table taken from: | |
515 | * | |
516 | * "Incorporating the I2O Architecture into BIOS for Intel Architecture | |
517 | * Platforms" | |
518 | * | |
519 | * This is an I2O document that is only available to I2O members, | |
520 | * not developers. | |
521 | * | |
522 | * From my understanding, this is how all the I2O cards do this | |
523 | * | |
524 | * Disk Size | Sectors | Heads | Cylinders | |
525 | * ---------------+---------+-------+------------------- | |
526 | * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512) | |
527 | * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512) | |
528 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
529 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
530 | * | |
531 | */ | |
532 | #define BLOCK_SIZE_528M 1081344 | |
533 | #define BLOCK_SIZE_1G 2097152 | |
534 | #define BLOCK_SIZE_21G 4403200 | |
535 | #define BLOCK_SIZE_42G 8806400 | |
536 | #define BLOCK_SIZE_84G 17612800 | |
537 | ||
538 | static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls, | |
539 | unsigned char *hds, unsigned char *secs) | |
540 | { | |
541 | unsigned long heads, sectors, cylinders; | |
542 | ||
543 | sectors = 63L; /* Maximize sectors per track */ | |
544 | if (capacity <= BLOCK_SIZE_528M) | |
545 | heads = 16; | |
546 | else if (capacity <= BLOCK_SIZE_1G) | |
547 | heads = 32; | |
548 | else if (capacity <= BLOCK_SIZE_21G) | |
549 | heads = 64; | |
550 | else if (capacity <= BLOCK_SIZE_42G) | |
551 | heads = 128; | |
552 | else | |
553 | heads = 255; | |
554 | ||
555 | cylinders = (unsigned long)capacity / (heads * sectors); | |
556 | ||
557 | *cyls = (unsigned short)cylinders; /* Stuff return values */ | |
558 | *secs = (unsigned char)sectors; | |
559 | *hds = (unsigned char)heads; | |
560 | } | |
561 | ||
562 | /** | |
563 | * i2o_block_open - Open the block device | |
b77b0ef2 RD |
564 | * @bdev: block device being opened |
565 | * @mode: file open mode | |
1da177e4 LT |
566 | * |
567 | * Power up the device, mount and lock the media. This function is called, | |
568 | * if the block device is opened for access. | |
569 | * | |
570 | * Returns 0 on success or negative error code on failure. | |
571 | */ | |
f3f6015b | 572 | static int i2o_block_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 573 | { |
f3f6015b | 574 | struct i2o_block_device *dev = bdev->bd_disk->private_data; |
1da177e4 LT |
575 | |
576 | if (!dev->i2o_dev) | |
577 | return -ENODEV; | |
578 | ||
579 | if (dev->power > 0x1f) | |
580 | i2o_block_device_power(dev, 0x02); | |
581 | ||
582 | i2o_block_device_mount(dev->i2o_dev, -1); | |
583 | ||
584 | i2o_block_device_lock(dev->i2o_dev, -1); | |
585 | ||
586 | osm_debug("Ready.\n"); | |
587 | ||
588 | return 0; | |
589 | }; | |
590 | ||
591 | /** | |
592 | * i2o_block_release - Release the I2O block device | |
b77b0ef2 RD |
593 | * @disk: gendisk device being released |
594 | * @mode: file open mode | |
1da177e4 LT |
595 | * |
596 | * Unlock and unmount the media, and power down the device. Gets called if | |
597 | * the block device is closed. | |
598 | * | |
599 | * Returns 0 on success or negative error code on failure. | |
600 | */ | |
f3f6015b | 601 | static int i2o_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 602 | { |
1da177e4 LT |
603 | struct i2o_block_device *dev = disk->private_data; |
604 | u8 operation; | |
605 | ||
606 | /* | |
607 | * This is to deail with the case of an application | |
608 | * opening a device and then the device dissapears while | |
609 | * it's in use, and then the application tries to release | |
610 | * it. ex: Unmounting a deleted RAID volume at reboot. | |
611 | * If we send messages, it will just cause FAILs since | |
612 | * the TID no longer exists. | |
613 | */ | |
614 | if (!dev->i2o_dev) | |
615 | return 0; | |
616 | ||
617 | i2o_block_device_flush(dev->i2o_dev); | |
618 | ||
619 | i2o_block_device_unlock(dev->i2o_dev, -1); | |
620 | ||
621 | if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */ | |
622 | operation = 0x21; | |
623 | else | |
624 | operation = 0x24; | |
625 | ||
626 | i2o_block_device_power(dev, operation); | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
a885c8c4 CH |
631 | static int i2o_block_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
632 | { | |
633 | i2o_block_biosparam(get_capacity(bdev->bd_disk), | |
634 | &geo->cylinders, &geo->heads, &geo->sectors); | |
635 | return 0; | |
636 | } | |
637 | ||
1da177e4 LT |
638 | /** |
639 | * i2o_block_ioctl - Issue device specific ioctl calls. | |
b77b0ef2 RD |
640 | * @bdev: block device being opened |
641 | * @mode: file open mode | |
1da177e4 LT |
642 | * @cmd: ioctl command |
643 | * @arg: arg | |
644 | * | |
645 | * Handles ioctl request for the block device. | |
646 | * | |
647 | * Return 0 on success or negative error on failure. | |
648 | */ | |
f3f6015b | 649 | static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
650 | unsigned int cmd, unsigned long arg) |
651 | { | |
f3f6015b | 652 | struct gendisk *disk = bdev->bd_disk; |
1da177e4 | 653 | struct i2o_block_device *dev = disk->private_data; |
1da177e4 LT |
654 | |
655 | /* Anyone capable of this syscall can do *real bad* things */ | |
656 | ||
657 | if (!capable(CAP_SYS_ADMIN)) | |
658 | return -EPERM; | |
659 | ||
660 | switch (cmd) { | |
1da177e4 LT |
661 | case BLKI2OGRSTRAT: |
662 | return put_user(dev->rcache, (int __user *)arg); | |
663 | case BLKI2OGWSTRAT: | |
664 | return put_user(dev->wcache, (int __user *)arg); | |
665 | case BLKI2OSRSTRAT: | |
666 | if (arg < 0 || arg > CACHE_SMARTFETCH) | |
667 | return -EINVAL; | |
668 | dev->rcache = arg; | |
669 | break; | |
670 | case BLKI2OSWSTRAT: | |
671 | if (arg != 0 | |
672 | && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) | |
673 | return -EINVAL; | |
674 | dev->wcache = arg; | |
675 | break; | |
676 | } | |
677 | return -ENOTTY; | |
678 | }; | |
679 | ||
680 | /** | |
681 | * i2o_block_media_changed - Have we seen a media change? | |
682 | * @disk: gendisk which should be verified | |
683 | * | |
684 | * Verifies if the media has changed. | |
685 | * | |
686 | * Returns 1 if the media was changed or 0 otherwise. | |
687 | */ | |
688 | static int i2o_block_media_changed(struct gendisk *disk) | |
689 | { | |
690 | struct i2o_block_device *p = disk->private_data; | |
691 | ||
692 | if (p->media_change_flag) { | |
693 | p->media_change_flag = 0; | |
694 | return 1; | |
695 | } | |
696 | return 0; | |
697 | } | |
698 | ||
699 | /** | |
700 | * i2o_block_transfer - Transfer a request to/from the I2O controller | |
701 | * @req: the request which should be transfered | |
702 | * | |
703 | * This function converts the request into a I2O message. The necessary | |
704 | * DMA buffers are allocated and after everything is setup post the message | |
705 | * to the I2O controller. No cleanup is done by this function. It is done | |
706 | * on the interrupt side when the reply arrives. | |
707 | * | |
708 | * Return 0 on success or negative error code on failure. | |
709 | */ | |
710 | static int i2o_block_transfer(struct request *req) | |
711 | { | |
712 | struct i2o_block_device *dev = req->rq_disk->private_data; | |
f10378ff | 713 | struct i2o_controller *c; |
db7526f9 | 714 | u32 tid = dev->i2o_dev->lct_data.tid; |
a1a5ea70 ML |
715 | struct i2o_message *msg; |
716 | u32 *mptr; | |
1da177e4 | 717 | struct i2o_block_request *ireq = req->special; |
1da177e4 | 718 | u32 tcntxt; |
f10378ff ML |
719 | u32 sgl_offset = SGL_OFFSET_8; |
720 | u32 ctl_flags = 0x00000000; | |
1da177e4 | 721 | int rc; |
f10378ff ML |
722 | u32 cmd; |
723 | ||
724 | if (unlikely(!dev->i2o_dev)) { | |
725 | osm_err("transfer to removed drive\n"); | |
726 | rc = -ENODEV; | |
727 | goto exit; | |
728 | } | |
729 | ||
730 | c = dev->i2o_dev->iop; | |
1da177e4 | 731 | |
a1a5ea70 ML |
732 | msg = i2o_msg_get(c); |
733 | if (IS_ERR(msg)) { | |
734 | rc = PTR_ERR(msg); | |
1da177e4 LT |
735 | goto exit; |
736 | } | |
737 | ||
738 | tcntxt = i2o_cntxt_list_add(c, req); | |
739 | if (!tcntxt) { | |
740 | rc = -ENOMEM; | |
741 | goto nop_msg; | |
742 | } | |
743 | ||
a1a5ea70 ML |
744 | msg->u.s.icntxt = cpu_to_le32(i2o_block_driver.context); |
745 | msg->u.s.tcntxt = cpu_to_le32(tcntxt); | |
1da177e4 | 746 | |
f10378ff | 747 | mptr = &msg->body[0]; |
1da177e4 LT |
748 | |
749 | if (rq_data_dir(req) == READ) { | |
f10378ff ML |
750 | cmd = I2O_CMD_BLOCK_READ << 24; |
751 | ||
1da177e4 | 752 | switch (dev->rcache) { |
1da177e4 | 753 | case CACHE_PREFETCH: |
f10378ff | 754 | ctl_flags = 0x201F0008; |
1da177e4 | 755 | break; |
f10378ff | 756 | |
1da177e4 | 757 | case CACHE_SMARTFETCH: |
83096ebf | 758 | if (blk_rq_sectors(req) > 16) |
f10378ff | 759 | ctl_flags = 0x201F0008; |
1da177e4 | 760 | else |
f10378ff ML |
761 | ctl_flags = 0x001F0000; |
762 | break; | |
763 | ||
764 | default: | |
1da177e4 LT |
765 | break; |
766 | } | |
767 | } else { | |
f10378ff ML |
768 | cmd = I2O_CMD_BLOCK_WRITE << 24; |
769 | ||
1da177e4 | 770 | switch (dev->wcache) { |
1da177e4 | 771 | case CACHE_WRITETHROUGH: |
f10378ff | 772 | ctl_flags = 0x001F0008; |
1da177e4 LT |
773 | break; |
774 | case CACHE_WRITEBACK: | |
f10378ff | 775 | ctl_flags = 0x001F0010; |
1da177e4 LT |
776 | break; |
777 | case CACHE_SMARTBACK: | |
83096ebf | 778 | if (blk_rq_sectors(req) > 16) |
f10378ff | 779 | ctl_flags = 0x001F0004; |
1da177e4 | 780 | else |
f10378ff | 781 | ctl_flags = 0x001F0010; |
1da177e4 LT |
782 | break; |
783 | case CACHE_SMARTTHROUGH: | |
83096ebf | 784 | if (blk_rq_sectors(req) > 16) |
f10378ff | 785 | ctl_flags = 0x001F0004; |
1da177e4 | 786 | else |
f10378ff ML |
787 | ctl_flags = 0x001F0010; |
788 | default: | |
789 | break; | |
790 | } | |
791 | } | |
792 | ||
793 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
794 | if (c->adaptec) { | |
795 | u8 cmd[10]; | |
796 | u32 scsi_flags; | |
e1defc4f | 797 | u16 hwsec; |
f10378ff | 798 | |
e1defc4f | 799 | hwsec = queue_logical_block_size(req->q) >> KERNEL_SECTOR_SHIFT; |
f10378ff ML |
800 | memset(cmd, 0, 10); |
801 | ||
802 | sgl_offset = SGL_OFFSET_12; | |
803 | ||
a1a5ea70 ML |
804 | msg->u.head[1] = |
805 | cpu_to_le32(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid); | |
f10378ff | 806 | |
a1a5ea70 ML |
807 | *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC); |
808 | *mptr++ = cpu_to_le32(tid); | |
f10378ff ML |
809 | |
810 | /* | |
811 | * ENABLE_DISCONNECT | |
812 | * SIMPLE_TAG | |
813 | * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME | |
814 | */ | |
815 | if (rq_data_dir(req) == READ) { | |
2e1973a3 | 816 | cmd[0] = READ_10; |
f10378ff ML |
817 | scsi_flags = 0x60a0000a; |
818 | } else { | |
2e1973a3 | 819 | cmd[0] = WRITE_10; |
f10378ff | 820 | scsi_flags = 0xa0a0000a; |
1da177e4 | 821 | } |
f10378ff | 822 | |
a1a5ea70 | 823 | *mptr++ = cpu_to_le32(scsi_flags); |
f10378ff | 824 | |
83096ebf TH |
825 | *((u32 *) & cmd[2]) = cpu_to_be32(blk_rq_pos(req) * hwsec); |
826 | *((u16 *) & cmd[7]) = cpu_to_be16(blk_rq_sectors(req) * hwsec); | |
f10378ff | 827 | |
a1a5ea70 | 828 | memcpy(mptr, cmd, 10); |
f10378ff | 829 | mptr += 4; |
1011c1b9 | 830 | *mptr++ = cpu_to_le32(blk_rq_bytes(req)); |
f10378ff ML |
831 | } else |
832 | #endif | |
833 | { | |
a1a5ea70 ML |
834 | msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); |
835 | *mptr++ = cpu_to_le32(ctl_flags); | |
1011c1b9 | 836 | *mptr++ = cpu_to_le32(blk_rq_bytes(req)); |
83096ebf TH |
837 | *mptr++ = |
838 | cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT)); | |
a1a5ea70 | 839 | *mptr++ = |
83096ebf | 840 | cpu_to_le32(blk_rq_pos(req) >> (32 - KERNEL_SECTOR_SHIFT)); |
1da177e4 LT |
841 | } |
842 | ||
f10378ff ML |
843 | if (!i2o_block_sglist_alloc(c, ireq, &mptr)) { |
844 | rc = -ENOMEM; | |
845 | goto context_remove; | |
1da177e4 LT |
846 | } |
847 | ||
a1a5ea70 ML |
848 | msg->u.head[0] = |
849 | cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset); | |
1da177e4 LT |
850 | |
851 | list_add_tail(&ireq->queue, &dev->open_queue); | |
852 | dev->open_queue_depth++; | |
853 | ||
a1a5ea70 | 854 | i2o_msg_post(c, msg); |
1da177e4 LT |
855 | |
856 | return 0; | |
857 | ||
858 | context_remove: | |
859 | i2o_cntxt_list_remove(c, req); | |
860 | ||
861 | nop_msg: | |
a1a5ea70 | 862 | i2o_msg_nop(c, msg); |
1da177e4 LT |
863 | |
864 | exit: | |
865 | return rc; | |
866 | }; | |
867 | ||
868 | /** | |
869 | * i2o_block_request_fn - request queue handling function | |
d9489fb6 | 870 | * @q: request queue from which the request could be fetched |
1da177e4 LT |
871 | * |
872 | * Takes the next request from the queue, transfers it and if no error | |
873 | * occurs dequeue it from the queue. On arrival of the reply the message | |
874 | * will be processed further. If an error occurs requeue the request. | |
875 | */ | |
876 | static void i2o_block_request_fn(struct request_queue *q) | |
877 | { | |
878 | struct request *req; | |
879 | ||
880 | while (!blk_queue_plugged(q)) { | |
9934c8c0 | 881 | req = blk_peek_request(q); |
1da177e4 LT |
882 | if (!req) |
883 | break; | |
884 | ||
885 | if (blk_fs_request(req)) { | |
886 | struct i2o_block_delayed_request *dreq; | |
887 | struct i2o_block_request *ireq = req->special; | |
888 | unsigned int queue_depth; | |
889 | ||
890 | queue_depth = ireq->i2o_blk_dev->open_queue_depth; | |
891 | ||
f10378ff | 892 | if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) { |
1da177e4 | 893 | if (!i2o_block_transfer(req)) { |
9934c8c0 | 894 | blk_start_request(req); |
1da177e4 | 895 | continue; |
f10378ff ML |
896 | } else |
897 | osm_info("transfer error\n"); | |
898 | } | |
1da177e4 LT |
899 | |
900 | if (queue_depth) | |
901 | break; | |
902 | ||
903 | /* stop the queue and retry later */ | |
904 | dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC); | |
905 | if (!dreq) | |
906 | continue; | |
907 | ||
908 | dreq->queue = q; | |
c4028958 DH |
909 | INIT_DELAYED_WORK(&dreq->work, |
910 | i2o_block_delayed_request_fn); | |
1da177e4 | 911 | |
1da177e4 LT |
912 | if (!queue_delayed_work(i2o_block_driver.event_queue, |
913 | &dreq->work, | |
914 | I2O_BLOCK_RETRY_TIME)) | |
915 | kfree(dreq); | |
916 | else { | |
917 | blk_stop_queue(q); | |
918 | break; | |
919 | } | |
296b2f6a | 920 | } else { |
9934c8c0 | 921 | blk_start_request(req); |
296b2f6a TH |
922 | __blk_end_request_all(req, -EIO); |
923 | } | |
1da177e4 LT |
924 | } |
925 | }; | |
926 | ||
927 | /* I2O Block device operations definition */ | |
83d5cde4 | 928 | static const struct block_device_operations i2o_block_fops = { |
1da177e4 | 929 | .owner = THIS_MODULE, |
f3f6015b AV |
930 | .open = i2o_block_open, |
931 | .release = i2o_block_release, | |
932 | .locked_ioctl = i2o_block_ioctl, | |
a885c8c4 | 933 | .getgeo = i2o_block_getgeo, |
1da177e4 LT |
934 | .media_changed = i2o_block_media_changed |
935 | }; | |
936 | ||
937 | /** | |
938 | * i2o_block_device_alloc - Allocate memory for a I2O Block device | |
939 | * | |
940 | * Allocate memory for the i2o_block_device struct, gendisk and request | |
941 | * queue and initialize them as far as no additional information is needed. | |
942 | * | |
af901ca1 | 943 | * Returns a pointer to the allocated I2O Block device on success or a |
1da177e4 LT |
944 | * negative error code on failure. |
945 | */ | |
946 | static struct i2o_block_device *i2o_block_device_alloc(void) | |
947 | { | |
948 | struct i2o_block_device *dev; | |
949 | struct gendisk *gd; | |
950 | struct request_queue *queue; | |
951 | int rc; | |
952 | ||
f6ed39a6 | 953 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
954 | if (!dev) { |
955 | osm_err("Insufficient memory to allocate I2O Block disk.\n"); | |
956 | rc = -ENOMEM; | |
957 | goto exit; | |
958 | } | |
1da177e4 LT |
959 | |
960 | INIT_LIST_HEAD(&dev->open_queue); | |
961 | spin_lock_init(&dev->lock); | |
962 | dev->rcache = CACHE_PREFETCH; | |
963 | dev->wcache = CACHE_WRITEBACK; | |
964 | ||
965 | /* allocate a gendisk with 16 partitions */ | |
966 | gd = alloc_disk(16); | |
967 | if (!gd) { | |
968 | osm_err("Insufficient memory to allocate gendisk.\n"); | |
969 | rc = -ENOMEM; | |
970 | goto cleanup_dev; | |
971 | } | |
972 | ||
973 | /* initialize the request queue */ | |
974 | queue = blk_init_queue(i2o_block_request_fn, &dev->lock); | |
975 | if (!queue) { | |
976 | osm_err("Insufficient memory to allocate request queue.\n"); | |
977 | rc = -ENOMEM; | |
978 | goto cleanup_queue; | |
979 | } | |
980 | ||
981 | blk_queue_prep_rq(queue, i2o_block_prep_req_fn); | |
982 | ||
983 | gd->major = I2O_MAJOR; | |
984 | gd->queue = queue; | |
985 | gd->fops = &i2o_block_fops; | |
986 | gd->private_data = dev; | |
987 | ||
988 | dev->gd = gd; | |
989 | ||
990 | return dev; | |
991 | ||
992 | cleanup_queue: | |
993 | put_disk(gd); | |
994 | ||
995 | cleanup_dev: | |
996 | kfree(dev); | |
997 | ||
998 | exit: | |
999 | return ERR_PTR(rc); | |
1000 | }; | |
1001 | ||
1002 | /** | |
1003 | * i2o_block_probe - verify if dev is a I2O Block device and install it | |
1004 | * @dev: device to verify if it is a I2O Block device | |
1005 | * | |
1006 | * We only verify if the user_tid of the device is 0xfff and then install | |
1007 | * the device. Otherwise it is used by some other device (e. g. RAID). | |
1008 | * | |
1009 | * Returns 0 on success or negative error code on failure. | |
1010 | */ | |
1011 | static int i2o_block_probe(struct device *dev) | |
1012 | { | |
1013 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
1da177e4 | 1014 | struct i2o_controller *c = i2o_dev->iop; |
f33213ec | 1015 | struct i2o_block_device *i2o_blk_dev; |
1da177e4 LT |
1016 | struct gendisk *gd; |
1017 | struct request_queue *queue; | |
1018 | static int unit = 0; | |
1019 | int rc; | |
1020 | u64 size; | |
1021 | u32 blocksize; | |
f10378ff | 1022 | u16 body_size = 4; |
793fd15d | 1023 | u16 power; |
f10378ff ML |
1024 | unsigned short max_sectors; |
1025 | ||
1026 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
1027 | if (c->adaptec) | |
1028 | body_size = 8; | |
1029 | #endif | |
1030 | ||
1031 | if (c->limit_sectors) | |
1032 | max_sectors = I2O_MAX_SECTORS_LIMITED; | |
1033 | else | |
1034 | max_sectors = I2O_MAX_SECTORS; | |
1da177e4 LT |
1035 | |
1036 | /* skip devices which are used by IOP */ | |
1037 | if (i2o_dev->lct_data.user_tid != 0xfff) { | |
1038 | osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid); | |
1039 | return -ENODEV; | |
1040 | } | |
1041 | ||
1da177e4 LT |
1042 | if (i2o_device_claim(i2o_dev)) { |
1043 | osm_warn("Unable to claim device. Installation aborted\n"); | |
1044 | rc = -EFAULT; | |
1045 | goto exit; | |
1046 | } | |
1047 | ||
1048 | i2o_blk_dev = i2o_block_device_alloc(); | |
1049 | if (IS_ERR(i2o_blk_dev)) { | |
1050 | osm_err("could not alloc a new I2O block device"); | |
1051 | rc = PTR_ERR(i2o_blk_dev); | |
1052 | goto claim_release; | |
1053 | } | |
1054 | ||
1055 | i2o_blk_dev->i2o_dev = i2o_dev; | |
1056 | dev_set_drvdata(dev, i2o_blk_dev); | |
1057 | ||
1058 | /* setup gendisk */ | |
1059 | gd = i2o_blk_dev->gd; | |
1060 | gd->first_minor = unit << 4; | |
1061 | sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit); | |
1da177e4 LT |
1062 | gd->driverfs_dev = &i2o_dev->device; |
1063 | ||
1064 | /* setup request queue */ | |
1065 | queue = gd->queue; | |
1066 | queue->queuedata = i2o_blk_dev; | |
1067 | ||
f10378ff ML |
1068 | blk_queue_max_phys_segments(queue, I2O_MAX_PHYS_SEGMENTS); |
1069 | blk_queue_max_sectors(queue, max_sectors); | |
1070 | blk_queue_max_hw_segments(queue, i2o_sg_tablesize(c, body_size)); | |
1da177e4 | 1071 | |
ae5fbf77 VA |
1072 | osm_debug("max sectors = %d\n", queue->max_sectors); |
1073 | osm_debug("phys segments = %d\n", queue->max_phys_segments); | |
f10378ff | 1074 | osm_debug("max hw segments = %d\n", queue->max_hw_segments); |
1da177e4 LT |
1075 | |
1076 | /* | |
1077 | * Ask for the current media data. If that isn't supported | |
1078 | * then we ask for the device capacity data | |
1079 | */ | |
793fd15d ML |
1080 | if (!i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) || |
1081 | !i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) { | |
e1defc4f | 1082 | blk_queue_logical_block_size(queue, le32_to_cpu(blocksize)); |
f10378ff ML |
1083 | } else |
1084 | osm_warn("unable to get blocksize of %s\n", gd->disk_name); | |
1da177e4 | 1085 | |
793fd15d ML |
1086 | if (!i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) || |
1087 | !i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) { | |
1088 | set_capacity(gd, le64_to_cpu(size) >> KERNEL_SECTOR_SHIFT); | |
f10378ff ML |
1089 | } else |
1090 | osm_warn("could not get size of %s\n", gd->disk_name); | |
f88e119c | 1091 | |
793fd15d ML |
1092 | if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2)) |
1093 | i2o_blk_dev->power = power; | |
1da177e4 | 1094 | |
1da177e4 LT |
1095 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff); |
1096 | ||
1097 | add_disk(gd); | |
1098 | ||
1099 | unit++; | |
1100 | ||
f88e119c ML |
1101 | osm_info("device added (TID: %03x): %s\n", i2o_dev->lct_data.tid, |
1102 | i2o_blk_dev->gd->disk_name); | |
1103 | ||
1da177e4 LT |
1104 | return 0; |
1105 | ||
1106 | claim_release: | |
1107 | i2o_device_claim_release(i2o_dev); | |
1108 | ||
1109 | exit: | |
1110 | return rc; | |
1111 | }; | |
1112 | ||
1113 | /* Block OSM driver struct */ | |
1114 | static struct i2o_driver i2o_block_driver = { | |
1115 | .name = OSM_NAME, | |
1116 | .event = i2o_block_event, | |
1117 | .reply = i2o_block_reply, | |
1118 | .classes = i2o_block_class_id, | |
1119 | .driver = { | |
1120 | .probe = i2o_block_probe, | |
1121 | .remove = i2o_block_remove, | |
1122 | }, | |
1123 | }; | |
1124 | ||
1125 | /** | |
1126 | * i2o_block_init - Block OSM initialization function | |
1127 | * | |
1128 | * Allocate the slab and mempool for request structs, registers i2o_block | |
1129 | * block device and finally register the Block OSM in the I2O core. | |
1130 | * | |
1131 | * Returns 0 on success or negative error code on failure. | |
1132 | */ | |
1133 | static int __init i2o_block_init(void) | |
1134 | { | |
1135 | int rc; | |
1136 | int size; | |
1137 | ||
1138 | printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); | |
1139 | ||
1140 | /* Allocate request mempool and slab */ | |
1141 | size = sizeof(struct i2o_block_request); | |
1142 | i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0, | |
20c2df83 | 1143 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
1144 | if (!i2o_blk_req_pool.slab) { |
1145 | osm_err("can't init request slab\n"); | |
1146 | rc = -ENOMEM; | |
1147 | goto exit; | |
1148 | } | |
1149 | ||
93d2341c MD |
1150 | i2o_blk_req_pool.pool = |
1151 | mempool_create_slab_pool(I2O_BLOCK_REQ_MEMPOOL_SIZE, | |
1152 | i2o_blk_req_pool.slab); | |
1da177e4 LT |
1153 | if (!i2o_blk_req_pool.pool) { |
1154 | osm_err("can't init request mempool\n"); | |
1155 | rc = -ENOMEM; | |
1156 | goto free_slab; | |
1157 | } | |
1158 | ||
1159 | /* Register the block device interfaces */ | |
1160 | rc = register_blkdev(I2O_MAJOR, "i2o_block"); | |
1161 | if (rc) { | |
1162 | osm_err("unable to register block device\n"); | |
1163 | goto free_mempool; | |
1164 | } | |
1165 | #ifdef MODULE | |
1166 | osm_info("registered device at major %d\n", I2O_MAJOR); | |
1167 | #endif | |
1168 | ||
1169 | /* Register Block OSM into I2O core */ | |
1170 | rc = i2o_driver_register(&i2o_block_driver); | |
1171 | if (rc) { | |
1172 | osm_err("Could not register Block driver\n"); | |
1173 | goto unregister_blkdev; | |
1174 | } | |
1175 | ||
1176 | return 0; | |
1177 | ||
1178 | unregister_blkdev: | |
1179 | unregister_blkdev(I2O_MAJOR, "i2o_block"); | |
1180 | ||
1181 | free_mempool: | |
1182 | mempool_destroy(i2o_blk_req_pool.pool); | |
1183 | ||
1184 | free_slab: | |
1185 | kmem_cache_destroy(i2o_blk_req_pool.slab); | |
1186 | ||
1187 | exit: | |
1188 | return rc; | |
1189 | }; | |
1190 | ||
1191 | /** | |
1192 | * i2o_block_exit - Block OSM exit function | |
1193 | * | |
1194 | * Unregisters Block OSM from I2O core, unregisters i2o_block block device | |
1195 | * and frees the mempool and slab. | |
1196 | */ | |
1197 | static void __exit i2o_block_exit(void) | |
1198 | { | |
1199 | /* Unregister I2O Block OSM from I2O core */ | |
1200 | i2o_driver_unregister(&i2o_block_driver); | |
1201 | ||
1202 | /* Unregister block device */ | |
1203 | unregister_blkdev(I2O_MAJOR, "i2o_block"); | |
1204 | ||
1205 | /* Free request mempool and slab */ | |
1206 | mempool_destroy(i2o_blk_req_pool.pool); | |
1207 | kmem_cache_destroy(i2o_blk_req_pool.slab); | |
1208 | }; | |
1209 | ||
1210 | MODULE_AUTHOR("Red Hat"); | |
1211 | MODULE_LICENSE("GPL"); | |
1212 | MODULE_DESCRIPTION(OSM_DESCRIPTION); | |
1213 | MODULE_VERSION(OSM_VERSION); | |
1214 | ||
1215 | module_init(i2o_block_init); | |
1216 | module_exit(i2o_block_exit); |