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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> | |
5a0e3ad6 | 54 | #include <linux/slab.h> |
1da177e4 LT |
55 | #include <linux/i2o.h> |
56 | ||
57 | #include <linux/mempool.h> | |
58 | ||
59 | #include <linux/genhd.h> | |
60 | #include <linux/blkdev.h> | |
61 | #include <linux/hdreg.h> | |
62 | ||
2e1973a3 ML |
63 | #include <scsi/scsi.h> |
64 | ||
1da177e4 LT |
65 | #include "i2o_block.h" |
66 | ||
67 | #define OSM_NAME "block-osm" | |
f6ed39a6 | 68 | #define OSM_VERSION "1.325" |
1da177e4 LT |
69 | #define OSM_DESCRIPTION "I2O Block Device OSM" |
70 | ||
71 | static struct i2o_driver i2o_block_driver; | |
72 | ||
73 | /* global Block OSM request mempool */ | |
74 | static struct i2o_block_mempool i2o_blk_req_pool; | |
75 | ||
76 | /* Block OSM class handling definition */ | |
77 | static struct i2o_class_id i2o_block_class_id[] = { | |
78 | {I2O_CLASS_RANDOM_BLOCK_STORAGE}, | |
79 | {I2O_CLASS_END} | |
80 | }; | |
81 | ||
82 | /** | |
83 | * i2o_block_device_free - free the memory of the I2O Block device | |
84 | * @dev: I2O Block device, which should be cleaned up | |
85 | * | |
86 | * Frees the request queue, gendisk and the i2o_block_device structure. | |
87 | */ | |
88 | static void i2o_block_device_free(struct i2o_block_device *dev) | |
89 | { | |
90 | blk_cleanup_queue(dev->gd->queue); | |
91 | ||
92 | put_disk(dev->gd); | |
93 | ||
94 | kfree(dev); | |
95 | }; | |
96 | ||
97 | /** | |
98 | * i2o_block_remove - remove the I2O Block device from the system again | |
99 | * @dev: I2O Block device which should be removed | |
100 | * | |
101 | * Remove gendisk from system and free all allocated memory. | |
102 | * | |
103 | * Always returns 0. | |
104 | */ | |
105 | static int i2o_block_remove(struct device *dev) | |
106 | { | |
107 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
108 | struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev); | |
109 | ||
f88e119c ML |
110 | osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid, |
111 | i2o_blk_dev->gd->disk_name); | |
1da177e4 LT |
112 | |
113 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0); | |
114 | ||
115 | del_gendisk(i2o_blk_dev->gd); | |
116 | ||
117 | dev_set_drvdata(dev, NULL); | |
118 | ||
119 | i2o_device_claim_release(i2o_dev); | |
120 | ||
121 | i2o_block_device_free(i2o_blk_dev); | |
122 | ||
123 | return 0; | |
124 | }; | |
125 | ||
126 | /** | |
127 | * i2o_block_device flush - Flush all dirty data of I2O device dev | |
128 | * @dev: I2O device which should be flushed | |
129 | * | |
130 | * Flushes all dirty data on device dev. | |
131 | * | |
132 | * Returns 0 on success or negative error code on failure. | |
133 | */ | |
134 | static int i2o_block_device_flush(struct i2o_device *dev) | |
135 | { | |
a1a5ea70 | 136 | struct i2o_message *msg; |
1da177e4 | 137 | |
a1a5ea70 ML |
138 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); |
139 | if (IS_ERR(msg)) | |
140 | return PTR_ERR(msg); | |
1da177e4 | 141 | |
a1a5ea70 ML |
142 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
143 | msg->u.head[1] = | |
144 | cpu_to_le32(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev-> | |
145 | lct_data.tid); | |
146 | msg->body[0] = cpu_to_le32(60 << 16); | |
1da177e4 LT |
147 | osm_debug("Flushing...\n"); |
148 | ||
a1a5ea70 | 149 | return i2o_msg_post_wait(dev->iop, msg, 60); |
1da177e4 LT |
150 | }; |
151 | ||
152 | /** | |
153 | * i2o_block_device_mount - Mount (load) the media of device dev | |
154 | * @dev: I2O device which should receive the mount request | |
155 | * @media_id: Media Identifier | |
156 | * | |
157 | * Load a media into drive. Identifier should be set to -1, because the | |
158 | * spec does not support any other value. | |
159 | * | |
160 | * Returns 0 on success or negative error code on failure. | |
161 | */ | |
162 | static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id) | |
163 | { | |
a1a5ea70 ML |
164 | struct i2o_message *msg; |
165 | ||
166 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); | |
167 | if (IS_ERR(msg)) | |
168 | return PTR_ERR(msg); | |
169 | ||
170 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); | |
171 | msg->u.head[1] = | |
172 | cpu_to_le32(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev-> | |
173 | lct_data.tid); | |
174 | msg->body[0] = cpu_to_le32(-1); | |
175 | msg->body[1] = cpu_to_le32(0x00000000); | |
1da177e4 LT |
176 | osm_debug("Mounting...\n"); |
177 | ||
a1a5ea70 | 178 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
179 | }; |
180 | ||
181 | /** | |
182 | * i2o_block_device_lock - Locks the media of device dev | |
183 | * @dev: I2O device which should receive the lock request | |
184 | * @media_id: Media Identifier | |
185 | * | |
186 | * Lock media of device dev to prevent removal. The media identifier | |
187 | * should be set to -1, because the spec does not support any other value. | |
188 | * | |
189 | * Returns 0 on success or negative error code on failure. | |
190 | */ | |
191 | static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) | |
192 | { | |
a1a5ea70 | 193 | struct i2o_message *msg; |
1da177e4 | 194 | |
a1a5ea70 | 195 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); |
010904cb | 196 | if (IS_ERR(msg)) |
a1a5ea70 | 197 | return PTR_ERR(msg); |
1da177e4 | 198 | |
a1a5ea70 ML |
199 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
200 | msg->u.head[1] = | |
201 | cpu_to_le32(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev-> | |
202 | lct_data.tid); | |
203 | msg->body[0] = cpu_to_le32(-1); | |
1da177e4 LT |
204 | osm_debug("Locking...\n"); |
205 | ||
a1a5ea70 | 206 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
207 | }; |
208 | ||
209 | /** | |
210 | * i2o_block_device_unlock - Unlocks the media of device dev | |
211 | * @dev: I2O device which should receive the unlocked request | |
212 | * @media_id: Media Identifier | |
213 | * | |
214 | * Unlocks the media in device dev. The media identifier should be set to | |
215 | * -1, because the spec does not support any other value. | |
216 | * | |
217 | * Returns 0 on success or negative error code on failure. | |
218 | */ | |
219 | static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id) | |
220 | { | |
a1a5ea70 | 221 | struct i2o_message *msg; |
1da177e4 | 222 | |
a1a5ea70 ML |
223 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); |
224 | if (IS_ERR(msg)) | |
225 | return PTR_ERR(msg); | |
1da177e4 | 226 | |
a1a5ea70 ML |
227 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
228 | msg->u.head[1] = | |
229 | cpu_to_le32(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev-> | |
230 | lct_data.tid); | |
231 | msg->body[0] = cpu_to_le32(media_id); | |
1da177e4 LT |
232 | osm_debug("Unlocking...\n"); |
233 | ||
a1a5ea70 | 234 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
235 | }; |
236 | ||
237 | /** | |
238 | * i2o_block_device_power - Power management for device dev | |
239 | * @dev: I2O device which should receive the power management request | |
d9489fb6 | 240 | * @op: Operation to send |
1da177e4 LT |
241 | * |
242 | * Send a power management request to the device dev. | |
243 | * | |
244 | * Returns 0 on success or negative error code on failure. | |
245 | */ | |
246 | static int i2o_block_device_power(struct i2o_block_device *dev, u8 op) | |
247 | { | |
248 | struct i2o_device *i2o_dev = dev->i2o_dev; | |
249 | struct i2o_controller *c = i2o_dev->iop; | |
a1a5ea70 | 250 | struct i2o_message *msg; |
1da177e4 LT |
251 | int rc; |
252 | ||
a1a5ea70 ML |
253 | msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); |
254 | if (IS_ERR(msg)) | |
255 | return PTR_ERR(msg); | |
1da177e4 | 256 | |
a1a5ea70 ML |
257 | msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0); |
258 | msg->u.head[1] = | |
259 | cpu_to_le32(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev-> | |
260 | lct_data.tid); | |
261 | msg->body[0] = cpu_to_le32(op << 24); | |
1da177e4 LT |
262 | osm_debug("Power...\n"); |
263 | ||
a1a5ea70 | 264 | rc = i2o_msg_post_wait(c, msg, 60); |
1da177e4 LT |
265 | if (!rc) |
266 | dev->power = op; | |
267 | ||
268 | return rc; | |
269 | }; | |
270 | ||
271 | /** | |
272 | * i2o_block_request_alloc - Allocate an I2O block request struct | |
273 | * | |
274 | * Allocates an I2O block request struct and initialize the list. | |
275 | * | |
276 | * Returns a i2o_block_request pointer on success or negative error code | |
277 | * on failure. | |
278 | */ | |
279 | static inline struct i2o_block_request *i2o_block_request_alloc(void) | |
280 | { | |
281 | struct i2o_block_request *ireq; | |
282 | ||
283 | ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC); | |
284 | if (!ireq) | |
285 | return ERR_PTR(-ENOMEM); | |
286 | ||
287 | INIT_LIST_HEAD(&ireq->queue); | |
3d1266c7 | 288 | sg_init_table(ireq->sg_table, I2O_MAX_PHYS_SEGMENTS); |
1da177e4 LT |
289 | |
290 | return ireq; | |
291 | }; | |
292 | ||
293 | /** | |
294 | * i2o_block_request_free - Frees a I2O block request | |
295 | * @ireq: I2O block request which should be freed | |
296 | * | |
d9489fb6 | 297 | * Frees the allocated memory (give it back to the request mempool). |
1da177e4 LT |
298 | */ |
299 | static inline void i2o_block_request_free(struct i2o_block_request *ireq) | |
300 | { | |
301 | mempool_free(ireq, i2o_blk_req_pool.pool); | |
302 | }; | |
303 | ||
304 | /** | |
305 | * i2o_block_sglist_alloc - Allocate the SG list and map it | |
f10378ff | 306 | * @c: I2O controller to which the request belongs |
1da177e4 | 307 | * @ireq: I2O block request |
d9489fb6 | 308 | * @mptr: message body pointer |
1da177e4 | 309 | * |
f10378ff | 310 | * Builds the SG list and map it to be accessable by the controller. |
1da177e4 | 311 | * |
f10378ff | 312 | * Returns 0 on failure or 1 on success. |
1da177e4 | 313 | */ |
f10378ff ML |
314 | static inline int i2o_block_sglist_alloc(struct i2o_controller *c, |
315 | struct i2o_block_request *ireq, | |
a1a5ea70 | 316 | u32 ** mptr) |
1da177e4 | 317 | { |
1da177e4 | 318 | int nents; |
f10378ff | 319 | enum dma_data_direction direction; |
1da177e4 | 320 | |
f10378ff | 321 | ireq->dev = &c->pdev->dev; |
1da177e4 LT |
322 | nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table); |
323 | ||
324 | if (rq_data_dir(ireq->req) == READ) | |
f10378ff | 325 | direction = PCI_DMA_FROMDEVICE; |
1da177e4 | 326 | else |
f10378ff | 327 | direction = PCI_DMA_TODEVICE; |
1da177e4 | 328 | |
f10378ff | 329 | ireq->sg_nents = nents; |
1da177e4 | 330 | |
f10378ff | 331 | return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr); |
1da177e4 LT |
332 | }; |
333 | ||
334 | /** | |
335 | * i2o_block_sglist_free - Frees the SG list | |
336 | * @ireq: I2O block request from which the SG should be freed | |
337 | * | |
338 | * Frees the SG list from the I2O block request. | |
339 | */ | |
340 | static inline void i2o_block_sglist_free(struct i2o_block_request *ireq) | |
341 | { | |
f10378ff | 342 | enum dma_data_direction direction; |
1da177e4 | 343 | |
f10378ff ML |
344 | if (rq_data_dir(ireq->req) == READ) |
345 | direction = PCI_DMA_FROMDEVICE; | |
346 | else | |
347 | direction = PCI_DMA_TODEVICE; | |
348 | ||
349 | dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction); | |
1da177e4 LT |
350 | }; |
351 | ||
352 | /** | |
353 | * i2o_block_prep_req_fn - Allocates I2O block device specific struct | |
354 | * @q: request queue for the request | |
355 | * @req: the request to prepare | |
356 | * | |
357 | * Allocate the necessary i2o_block_request struct and connect it to | |
5e333309 | 358 | * the request. This is needed that we not lose the SG list later on. |
1da177e4 LT |
359 | * |
360 | * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure. | |
361 | */ | |
362 | static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req) | |
363 | { | |
364 | struct i2o_block_device *i2o_blk_dev = q->queuedata; | |
365 | struct i2o_block_request *ireq; | |
366 | ||
f10378ff ML |
367 | if (unlikely(!i2o_blk_dev)) { |
368 | osm_err("block device already removed\n"); | |
369 | return BLKPREP_KILL; | |
370 | } | |
371 | ||
1da177e4 LT |
372 | /* connect the i2o_block_request to the request */ |
373 | if (!req->special) { | |
374 | ireq = i2o_block_request_alloc(); | |
801678c5 | 375 | if (IS_ERR(ireq)) { |
1da177e4 LT |
376 | osm_debug("unable to allocate i2o_block_request!\n"); |
377 | return BLKPREP_DEFER; | |
378 | } | |
379 | ||
380 | ireq->i2o_blk_dev = i2o_blk_dev; | |
381 | req->special = ireq; | |
382 | ireq->req = req; | |
d1985ad1 | 383 | } |
1da177e4 | 384 | /* do not come back here */ |
4aff5e23 | 385 | req->cmd_flags |= REQ_DONTPREP; |
1da177e4 LT |
386 | |
387 | return BLKPREP_OK; | |
388 | }; | |
389 | ||
390 | /** | |
391 | * i2o_block_delayed_request_fn - delayed request queue function | |
c4028958 | 392 | * @work: the delayed request with the queue to start |
1da177e4 LT |
393 | * |
394 | * If the request queue is stopped for a disk, and there is no open | |
395 | * request, a new event is created, which calls this function to start | |
396 | * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never | |
397 | * be started again. | |
398 | */ | |
c4028958 | 399 | static void i2o_block_delayed_request_fn(struct work_struct *work) |
1da177e4 | 400 | { |
c4028958 DH |
401 | struct i2o_block_delayed_request *dreq = |
402 | container_of(work, struct i2o_block_delayed_request, | |
403 | work.work); | |
1da177e4 LT |
404 | struct request_queue *q = dreq->queue; |
405 | unsigned long flags; | |
406 | ||
407 | spin_lock_irqsave(q->queue_lock, flags); | |
408 | blk_start_queue(q); | |
409 | spin_unlock_irqrestore(q->queue_lock, flags); | |
410 | kfree(dreq); | |
411 | }; | |
412 | ||
413 | /** | |
f88e119c ML |
414 | * i2o_block_end_request - Post-processing of completed commands |
415 | * @req: request which should be completed | |
1381b7e8 | 416 | * @error: 0 for success, < 0 for error |
f88e119c | 417 | * @nr_bytes: number of bytes to complete |
1da177e4 | 418 | * |
f88e119c | 419 | * Mark the request as complete. The lock must not be held when entering. |
1da177e4 LT |
420 | * |
421 | */ | |
1381b7e8 | 422 | static void i2o_block_end_request(struct request *req, int error, |
f88e119c | 423 | int nr_bytes) |
1da177e4 | 424 | { |
f88e119c ML |
425 | struct i2o_block_request *ireq = req->special; |
426 | struct i2o_block_device *dev = ireq->i2o_blk_dev; | |
165125e1 | 427 | struct request_queue *q = req->q; |
1da177e4 LT |
428 | unsigned long flags; |
429 | ||
1011c1b9 | 430 | if (blk_end_request(req, error, nr_bytes)) |
1381b7e8 | 431 | if (error) |
1011c1b9 | 432 | blk_end_request_all(req, -EIO); |
1da177e4 | 433 | |
f88e119c | 434 | spin_lock_irqsave(q->queue_lock, flags); |
1da177e4 | 435 | |
f10378ff ML |
436 | if (likely(dev)) { |
437 | dev->open_queue_depth--; | |
438 | list_del(&ireq->queue); | |
439 | } | |
1da177e4 | 440 | |
f88e119c | 441 | blk_start_queue(q); |
1da177e4 | 442 | |
f88e119c | 443 | spin_unlock_irqrestore(q->queue_lock, flags); |
1da177e4 | 444 | |
f88e119c ML |
445 | i2o_block_sglist_free(ireq); |
446 | i2o_block_request_free(ireq); | |
447 | }; | |
1da177e4 | 448 | |
f88e119c ML |
449 | /** |
450 | * i2o_block_reply - Block OSM reply handler. | |
451 | * @c: I2O controller from which the message arrives | |
452 | * @m: message id of reply | |
d9489fb6 | 453 | * @msg: the actual I2O message reply |
f88e119c ML |
454 | * |
455 | * This function gets all the message replies. | |
456 | * | |
457 | */ | |
458 | static int i2o_block_reply(struct i2o_controller *c, u32 m, | |
459 | struct i2o_message *msg) | |
460 | { | |
461 | struct request *req; | |
1381b7e8 | 462 | int error = 0; |
1da177e4 LT |
463 | |
464 | req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); | |
465 | if (unlikely(!req)) { | |
466 | osm_err("NULL reply received!\n"); | |
467 | return -1; | |
468 | } | |
469 | ||
1da177e4 LT |
470 | /* |
471 | * Lets see what is cooking. We stuffed the | |
472 | * request in the context. | |
473 | */ | |
474 | ||
f88e119c ML |
475 | if ((le32_to_cpu(msg->body[0]) >> 24) != 0) { |
476 | u32 status = le32_to_cpu(msg->body[0]); | |
1da177e4 LT |
477 | /* |
478 | * Device not ready means two things. One is that the | |
479 | * the thing went offline (but not a removal media) | |
480 | * | |
481 | * The second is that you have a SuperTrak 100 and the | |
482 | * firmware got constipated. Unlike standard i2o card | |
483 | * setups the supertrak returns an error rather than | |
484 | * blocking for the timeout in these cases. | |
485 | * | |
486 | * Don't stick a supertrak100 into cache aggressive modes | |
487 | */ | |
488 | ||
f10378ff ML |
489 | osm_err("TID %03x error status: 0x%02x, detailed status: " |
490 | "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff), | |
f88e119c | 491 | status >> 24, status & 0xffff); |
1da177e4 | 492 | |
f88e119c | 493 | req->errors++; |
1da177e4 | 494 | |
1381b7e8 | 495 | error = -EIO; |
f88e119c | 496 | } |
1da177e4 | 497 | |
1381b7e8 | 498 | i2o_block_end_request(req, error, le32_to_cpu(msg->body[1])); |
1da177e4 LT |
499 | |
500 | return 1; | |
501 | }; | |
502 | ||
c4028958 | 503 | static void i2o_block_event(struct work_struct *work) |
1da177e4 | 504 | { |
c4028958 | 505 | struct i2o_event *evt = container_of(work, struct i2o_event, work); |
9e87545f | 506 | osm_debug("event received\n"); |
223230e7 | 507 | kfree(evt); |
1da177e4 LT |
508 | }; |
509 | ||
510 | /* | |
511 | * SCSI-CAM for ioctl geometry mapping | |
512 | * Duplicated with SCSI - this should be moved into somewhere common | |
513 | * perhaps genhd ? | |
514 | * | |
515 | * LBA -> CHS mapping table taken from: | |
516 | * | |
517 | * "Incorporating the I2O Architecture into BIOS for Intel Architecture | |
518 | * Platforms" | |
519 | * | |
520 | * This is an I2O document that is only available to I2O members, | |
521 | * not developers. | |
522 | * | |
523 | * From my understanding, this is how all the I2O cards do this | |
524 | * | |
525 | * Disk Size | Sectors | Heads | Cylinders | |
526 | * ---------------+---------+-------+------------------- | |
527 | * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512) | |
528 | * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512) | |
529 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
530 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
531 | * | |
532 | */ | |
533 | #define BLOCK_SIZE_528M 1081344 | |
534 | #define BLOCK_SIZE_1G 2097152 | |
535 | #define BLOCK_SIZE_21G 4403200 | |
536 | #define BLOCK_SIZE_42G 8806400 | |
537 | #define BLOCK_SIZE_84G 17612800 | |
538 | ||
539 | static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls, | |
540 | unsigned char *hds, unsigned char *secs) | |
541 | { | |
542 | unsigned long heads, sectors, cylinders; | |
543 | ||
544 | sectors = 63L; /* Maximize sectors per track */ | |
545 | if (capacity <= BLOCK_SIZE_528M) | |
546 | heads = 16; | |
547 | else if (capacity <= BLOCK_SIZE_1G) | |
548 | heads = 32; | |
549 | else if (capacity <= BLOCK_SIZE_21G) | |
550 | heads = 64; | |
551 | else if (capacity <= BLOCK_SIZE_42G) | |
552 | heads = 128; | |
553 | else | |
554 | heads = 255; | |
555 | ||
556 | cylinders = (unsigned long)capacity / (heads * sectors); | |
557 | ||
558 | *cyls = (unsigned short)cylinders; /* Stuff return values */ | |
559 | *secs = (unsigned char)sectors; | |
560 | *hds = (unsigned char)heads; | |
561 | } | |
562 | ||
563 | /** | |
564 | * i2o_block_open - Open the block device | |
b77b0ef2 RD |
565 | * @bdev: block device being opened |
566 | * @mode: file open mode | |
1da177e4 LT |
567 | * |
568 | * Power up the device, mount and lock the media. This function is called, | |
569 | * if the block device is opened for access. | |
570 | * | |
571 | * Returns 0 on success or negative error code on failure. | |
572 | */ | |
f3f6015b | 573 | static int i2o_block_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 574 | { |
f3f6015b | 575 | struct i2o_block_device *dev = bdev->bd_disk->private_data; |
1da177e4 LT |
576 | |
577 | if (!dev->i2o_dev) | |
578 | return -ENODEV; | |
579 | ||
580 | if (dev->power > 0x1f) | |
581 | i2o_block_device_power(dev, 0x02); | |
582 | ||
583 | i2o_block_device_mount(dev->i2o_dev, -1); | |
584 | ||
585 | i2o_block_device_lock(dev->i2o_dev, -1); | |
586 | ||
587 | osm_debug("Ready.\n"); | |
588 | ||
589 | return 0; | |
590 | }; | |
591 | ||
592 | /** | |
593 | * i2o_block_release - Release the I2O block device | |
b77b0ef2 RD |
594 | * @disk: gendisk device being released |
595 | * @mode: file open mode | |
1da177e4 LT |
596 | * |
597 | * Unlock and unmount the media, and power down the device. Gets called if | |
598 | * the block device is closed. | |
599 | * | |
600 | * Returns 0 on success or negative error code on failure. | |
601 | */ | |
f3f6015b | 602 | static int i2o_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 603 | { |
1da177e4 LT |
604 | struct i2o_block_device *dev = disk->private_data; |
605 | u8 operation; | |
606 | ||
607 | /* | |
608 | * This is to deail with the case of an application | |
609 | * opening a device and then the device dissapears while | |
610 | * it's in use, and then the application tries to release | |
611 | * it. ex: Unmounting a deleted RAID volume at reboot. | |
612 | * If we send messages, it will just cause FAILs since | |
613 | * the TID no longer exists. | |
614 | */ | |
615 | if (!dev->i2o_dev) | |
616 | return 0; | |
617 | ||
618 | i2o_block_device_flush(dev->i2o_dev); | |
619 | ||
620 | i2o_block_device_unlock(dev->i2o_dev, -1); | |
621 | ||
622 | if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */ | |
623 | operation = 0x21; | |
624 | else | |
625 | operation = 0x24; | |
626 | ||
627 | i2o_block_device_power(dev, operation); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
a885c8c4 CH |
632 | static int i2o_block_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
633 | { | |
634 | i2o_block_biosparam(get_capacity(bdev->bd_disk), | |
635 | &geo->cylinders, &geo->heads, &geo->sectors); | |
636 | return 0; | |
637 | } | |
638 | ||
1da177e4 LT |
639 | /** |
640 | * i2o_block_ioctl - Issue device specific ioctl calls. | |
b77b0ef2 RD |
641 | * @bdev: block device being opened |
642 | * @mode: file open mode | |
1da177e4 LT |
643 | * @cmd: ioctl command |
644 | * @arg: arg | |
645 | * | |
646 | * Handles ioctl request for the block device. | |
647 | * | |
648 | * Return 0 on success or negative error on failure. | |
649 | */ | |
f3f6015b | 650 | static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
651 | unsigned int cmd, unsigned long arg) |
652 | { | |
f3f6015b | 653 | struct gendisk *disk = bdev->bd_disk; |
1da177e4 | 654 | struct i2o_block_device *dev = disk->private_data; |
1da177e4 LT |
655 | |
656 | /* Anyone capable of this syscall can do *real bad* things */ | |
657 | ||
658 | if (!capable(CAP_SYS_ADMIN)) | |
659 | return -EPERM; | |
660 | ||
661 | switch (cmd) { | |
1da177e4 | 662 | case BLKI2OGRSTRAT: |
8a6cfeb6 | 663 | return put_user(dev->rcache, (int __user *)arg); |
1da177e4 | 664 | case BLKI2OGWSTRAT: |
8a6cfeb6 | 665 | return put_user(dev->wcache, (int __user *)arg); |
1da177e4 LT |
666 | case BLKI2OSRSTRAT: |
667 | if (arg < 0 || arg > CACHE_SMARTFETCH) | |
8a6cfeb6 | 668 | return -EINVAL; |
1da177e4 LT |
669 | dev->rcache = arg; |
670 | break; | |
671 | case BLKI2OSWSTRAT: | |
672 | if (arg != 0 | |
673 | && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) | |
8a6cfeb6 | 674 | return -EINVAL; |
1da177e4 LT |
675 | dev->wcache = arg; |
676 | break; | |
677 | } | |
8a6cfeb6 | 678 | return -ENOTTY; |
1da177e4 LT |
679 | }; |
680 | ||
681 | /** | |
682 | * i2o_block_media_changed - Have we seen a media change? | |
683 | * @disk: gendisk which should be verified | |
684 | * | |
685 | * Verifies if the media has changed. | |
686 | * | |
687 | * Returns 1 if the media was changed or 0 otherwise. | |
688 | */ | |
689 | static int i2o_block_media_changed(struct gendisk *disk) | |
690 | { | |
691 | struct i2o_block_device *p = disk->private_data; | |
692 | ||
693 | if (p->media_change_flag) { | |
694 | p->media_change_flag = 0; | |
695 | return 1; | |
696 | } | |
697 | return 0; | |
698 | } | |
699 | ||
700 | /** | |
701 | * i2o_block_transfer - Transfer a request to/from the I2O controller | |
702 | * @req: the request which should be transfered | |
703 | * | |
704 | * This function converts the request into a I2O message. The necessary | |
705 | * DMA buffers are allocated and after everything is setup post the message | |
706 | * to the I2O controller. No cleanup is done by this function. It is done | |
707 | * on the interrupt side when the reply arrives. | |
708 | * | |
709 | * Return 0 on success or negative error code on failure. | |
710 | */ | |
711 | static int i2o_block_transfer(struct request *req) | |
712 | { | |
713 | struct i2o_block_device *dev = req->rq_disk->private_data; | |
f10378ff | 714 | struct i2o_controller *c; |
db7526f9 | 715 | u32 tid = dev->i2o_dev->lct_data.tid; |
a1a5ea70 ML |
716 | struct i2o_message *msg; |
717 | u32 *mptr; | |
1da177e4 | 718 | struct i2o_block_request *ireq = req->special; |
1da177e4 | 719 | u32 tcntxt; |
f10378ff ML |
720 | u32 sgl_offset = SGL_OFFSET_8; |
721 | u32 ctl_flags = 0x00000000; | |
1da177e4 | 722 | int rc; |
f10378ff ML |
723 | u32 cmd; |
724 | ||
725 | if (unlikely(!dev->i2o_dev)) { | |
726 | osm_err("transfer to removed drive\n"); | |
727 | rc = -ENODEV; | |
728 | goto exit; | |
729 | } | |
730 | ||
731 | c = dev->i2o_dev->iop; | |
1da177e4 | 732 | |
a1a5ea70 ML |
733 | msg = i2o_msg_get(c); |
734 | if (IS_ERR(msg)) { | |
735 | rc = PTR_ERR(msg); | |
1da177e4 LT |
736 | goto exit; |
737 | } | |
738 | ||
739 | tcntxt = i2o_cntxt_list_add(c, req); | |
740 | if (!tcntxt) { | |
741 | rc = -ENOMEM; | |
742 | goto nop_msg; | |
743 | } | |
744 | ||
a1a5ea70 ML |
745 | msg->u.s.icntxt = cpu_to_le32(i2o_block_driver.context); |
746 | msg->u.s.tcntxt = cpu_to_le32(tcntxt); | |
1da177e4 | 747 | |
f10378ff | 748 | mptr = &msg->body[0]; |
1da177e4 LT |
749 | |
750 | if (rq_data_dir(req) == READ) { | |
f10378ff ML |
751 | cmd = I2O_CMD_BLOCK_READ << 24; |
752 | ||
1da177e4 | 753 | switch (dev->rcache) { |
1da177e4 | 754 | case CACHE_PREFETCH: |
f10378ff | 755 | ctl_flags = 0x201F0008; |
1da177e4 | 756 | break; |
f10378ff | 757 | |
1da177e4 | 758 | case CACHE_SMARTFETCH: |
83096ebf | 759 | if (blk_rq_sectors(req) > 16) |
f10378ff | 760 | ctl_flags = 0x201F0008; |
1da177e4 | 761 | else |
f10378ff ML |
762 | ctl_flags = 0x001F0000; |
763 | break; | |
764 | ||
765 | default: | |
1da177e4 LT |
766 | break; |
767 | } | |
768 | } else { | |
f10378ff ML |
769 | cmd = I2O_CMD_BLOCK_WRITE << 24; |
770 | ||
1da177e4 | 771 | switch (dev->wcache) { |
1da177e4 | 772 | case CACHE_WRITETHROUGH: |
f10378ff | 773 | ctl_flags = 0x001F0008; |
1da177e4 LT |
774 | break; |
775 | case CACHE_WRITEBACK: | |
f10378ff | 776 | ctl_flags = 0x001F0010; |
1da177e4 LT |
777 | break; |
778 | case CACHE_SMARTBACK: | |
83096ebf | 779 | if (blk_rq_sectors(req) > 16) |
f10378ff | 780 | ctl_flags = 0x001F0004; |
1da177e4 | 781 | else |
f10378ff | 782 | ctl_flags = 0x001F0010; |
1da177e4 LT |
783 | break; |
784 | case CACHE_SMARTTHROUGH: | |
83096ebf | 785 | if (blk_rq_sectors(req) > 16) |
f10378ff | 786 | ctl_flags = 0x001F0004; |
1da177e4 | 787 | else |
f10378ff ML |
788 | ctl_flags = 0x001F0010; |
789 | default: | |
790 | break; | |
791 | } | |
792 | } | |
793 | ||
794 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
795 | if (c->adaptec) { | |
796 | u8 cmd[10]; | |
797 | u32 scsi_flags; | |
e1defc4f | 798 | u16 hwsec; |
f10378ff | 799 | |
e1defc4f | 800 | hwsec = queue_logical_block_size(req->q) >> KERNEL_SECTOR_SHIFT; |
f10378ff ML |
801 | memset(cmd, 0, 10); |
802 | ||
803 | sgl_offset = SGL_OFFSET_12; | |
804 | ||
a1a5ea70 ML |
805 | msg->u.head[1] = |
806 | cpu_to_le32(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid); | |
f10378ff | 807 | |
a1a5ea70 ML |
808 | *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC); |
809 | *mptr++ = cpu_to_le32(tid); | |
f10378ff ML |
810 | |
811 | /* | |
812 | * ENABLE_DISCONNECT | |
813 | * SIMPLE_TAG | |
814 | * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME | |
815 | */ | |
816 | if (rq_data_dir(req) == READ) { | |
2e1973a3 | 817 | cmd[0] = READ_10; |
f10378ff ML |
818 | scsi_flags = 0x60a0000a; |
819 | } else { | |
2e1973a3 | 820 | cmd[0] = WRITE_10; |
f10378ff | 821 | scsi_flags = 0xa0a0000a; |
1da177e4 | 822 | } |
f10378ff | 823 | |
a1a5ea70 | 824 | *mptr++ = cpu_to_le32(scsi_flags); |
f10378ff | 825 | |
83096ebf TH |
826 | *((u32 *) & cmd[2]) = cpu_to_be32(blk_rq_pos(req) * hwsec); |
827 | *((u16 *) & cmd[7]) = cpu_to_be16(blk_rq_sectors(req) * hwsec); | |
f10378ff | 828 | |
a1a5ea70 | 829 | memcpy(mptr, cmd, 10); |
f10378ff | 830 | mptr += 4; |
1011c1b9 | 831 | *mptr++ = cpu_to_le32(blk_rq_bytes(req)); |
f10378ff ML |
832 | } else |
833 | #endif | |
834 | { | |
a1a5ea70 ML |
835 | msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); |
836 | *mptr++ = cpu_to_le32(ctl_flags); | |
1011c1b9 | 837 | *mptr++ = cpu_to_le32(blk_rq_bytes(req)); |
83096ebf TH |
838 | *mptr++ = |
839 | cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT)); | |
a1a5ea70 | 840 | *mptr++ = |
83096ebf | 841 | cpu_to_le32(blk_rq_pos(req) >> (32 - KERNEL_SECTOR_SHIFT)); |
1da177e4 LT |
842 | } |
843 | ||
f10378ff ML |
844 | if (!i2o_block_sglist_alloc(c, ireq, &mptr)) { |
845 | rc = -ENOMEM; | |
846 | goto context_remove; | |
1da177e4 LT |
847 | } |
848 | ||
a1a5ea70 ML |
849 | msg->u.head[0] = |
850 | cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset); | |
1da177e4 LT |
851 | |
852 | list_add_tail(&ireq->queue, &dev->open_queue); | |
853 | dev->open_queue_depth++; | |
854 | ||
a1a5ea70 | 855 | i2o_msg_post(c, msg); |
1da177e4 LT |
856 | |
857 | return 0; | |
858 | ||
859 | context_remove: | |
860 | i2o_cntxt_list_remove(c, req); | |
861 | ||
862 | nop_msg: | |
a1a5ea70 | 863 | i2o_msg_nop(c, msg); |
1da177e4 LT |
864 | |
865 | exit: | |
866 | return rc; | |
867 | }; | |
868 | ||
869 | /** | |
870 | * i2o_block_request_fn - request queue handling function | |
d9489fb6 | 871 | * @q: request queue from which the request could be fetched |
1da177e4 LT |
872 | * |
873 | * Takes the next request from the queue, transfers it and if no error | |
874 | * occurs dequeue it from the queue. On arrival of the reply the message | |
875 | * will be processed further. If an error occurs requeue the request. | |
876 | */ | |
877 | static void i2o_block_request_fn(struct request_queue *q) | |
878 | { | |
879 | struct request *req; | |
880 | ||
881 | while (!blk_queue_plugged(q)) { | |
9934c8c0 | 882 | req = blk_peek_request(q); |
1da177e4 LT |
883 | if (!req) |
884 | break; | |
885 | ||
33659ebb | 886 | if (req->cmd_type == REQ_TYPE_FS) { |
1da177e4 LT |
887 | struct i2o_block_delayed_request *dreq; |
888 | struct i2o_block_request *ireq = req->special; | |
889 | unsigned int queue_depth; | |
890 | ||
891 | queue_depth = ireq->i2o_blk_dev->open_queue_depth; | |
892 | ||
f10378ff | 893 | if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) { |
1da177e4 | 894 | if (!i2o_block_transfer(req)) { |
9934c8c0 | 895 | blk_start_request(req); |
1da177e4 | 896 | continue; |
f10378ff ML |
897 | } else |
898 | osm_info("transfer error\n"); | |
899 | } | |
1da177e4 LT |
900 | |
901 | if (queue_depth) | |
902 | break; | |
903 | ||
904 | /* stop the queue and retry later */ | |
905 | dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC); | |
906 | if (!dreq) | |
907 | continue; | |
908 | ||
909 | dreq->queue = q; | |
c4028958 DH |
910 | INIT_DELAYED_WORK(&dreq->work, |
911 | i2o_block_delayed_request_fn); | |
1da177e4 | 912 | |
1da177e4 LT |
913 | if (!queue_delayed_work(i2o_block_driver.event_queue, |
914 | &dreq->work, | |
915 | I2O_BLOCK_RETRY_TIME)) | |
916 | kfree(dreq); | |
917 | else { | |
918 | blk_stop_queue(q); | |
919 | break; | |
920 | } | |
296b2f6a | 921 | } else { |
9934c8c0 | 922 | blk_start_request(req); |
296b2f6a TH |
923 | __blk_end_request_all(req, -EIO); |
924 | } | |
1da177e4 LT |
925 | } |
926 | }; | |
927 | ||
928 | /* I2O Block device operations definition */ | |
83d5cde4 | 929 | static const struct block_device_operations i2o_block_fops = { |
1da177e4 | 930 | .owner = THIS_MODULE, |
f3f6015b AV |
931 | .open = i2o_block_open, |
932 | .release = i2o_block_release, | |
34484062 | 933 | .ioctl = i2o_block_ioctl, |
a885c8c4 | 934 | .getgeo = i2o_block_getgeo, |
1da177e4 LT |
935 | .media_changed = i2o_block_media_changed |
936 | }; | |
937 | ||
938 | /** | |
939 | * i2o_block_device_alloc - Allocate memory for a I2O Block device | |
940 | * | |
941 | * Allocate memory for the i2o_block_device struct, gendisk and request | |
942 | * queue and initialize them as far as no additional information is needed. | |
943 | * | |
af901ca1 | 944 | * Returns a pointer to the allocated I2O Block device on success or a |
1da177e4 LT |
945 | * negative error code on failure. |
946 | */ | |
947 | static struct i2o_block_device *i2o_block_device_alloc(void) | |
948 | { | |
949 | struct i2o_block_device *dev; | |
950 | struct gendisk *gd; | |
951 | struct request_queue *queue; | |
952 | int rc; | |
953 | ||
f6ed39a6 | 954 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
955 | if (!dev) { |
956 | osm_err("Insufficient memory to allocate I2O Block disk.\n"); | |
957 | rc = -ENOMEM; | |
958 | goto exit; | |
959 | } | |
1da177e4 LT |
960 | |
961 | INIT_LIST_HEAD(&dev->open_queue); | |
962 | spin_lock_init(&dev->lock); | |
963 | dev->rcache = CACHE_PREFETCH; | |
964 | dev->wcache = CACHE_WRITEBACK; | |
965 | ||
966 | /* allocate a gendisk with 16 partitions */ | |
967 | gd = alloc_disk(16); | |
968 | if (!gd) { | |
969 | osm_err("Insufficient memory to allocate gendisk.\n"); | |
970 | rc = -ENOMEM; | |
971 | goto cleanup_dev; | |
972 | } | |
973 | ||
974 | /* initialize the request queue */ | |
975 | queue = blk_init_queue(i2o_block_request_fn, &dev->lock); | |
976 | if (!queue) { | |
977 | osm_err("Insufficient memory to allocate request queue.\n"); | |
978 | rc = -ENOMEM; | |
979 | goto cleanup_queue; | |
980 | } | |
981 | ||
982 | blk_queue_prep_rq(queue, i2o_block_prep_req_fn); | |
983 | ||
984 | gd->major = I2O_MAJOR; | |
985 | gd->queue = queue; | |
986 | gd->fops = &i2o_block_fops; | |
987 | gd->private_data = dev; | |
988 | ||
989 | dev->gd = gd; | |
990 | ||
991 | return dev; | |
992 | ||
993 | cleanup_queue: | |
994 | put_disk(gd); | |
995 | ||
996 | cleanup_dev: | |
997 | kfree(dev); | |
998 | ||
999 | exit: | |
1000 | return ERR_PTR(rc); | |
1001 | }; | |
1002 | ||
1003 | /** | |
1004 | * i2o_block_probe - verify if dev is a I2O Block device and install it | |
1005 | * @dev: device to verify if it is a I2O Block device | |
1006 | * | |
1007 | * We only verify if the user_tid of the device is 0xfff and then install | |
1008 | * the device. Otherwise it is used by some other device (e. g. RAID). | |
1009 | * | |
1010 | * Returns 0 on success or negative error code on failure. | |
1011 | */ | |
1012 | static int i2o_block_probe(struct device *dev) | |
1013 | { | |
1014 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
1da177e4 | 1015 | struct i2o_controller *c = i2o_dev->iop; |
f33213ec | 1016 | struct i2o_block_device *i2o_blk_dev; |
1da177e4 LT |
1017 | struct gendisk *gd; |
1018 | struct request_queue *queue; | |
1019 | static int unit = 0; | |
1020 | int rc; | |
1021 | u64 size; | |
1022 | u32 blocksize; | |
f10378ff | 1023 | u16 body_size = 4; |
793fd15d | 1024 | u16 power; |
f10378ff ML |
1025 | unsigned short max_sectors; |
1026 | ||
1027 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
1028 | if (c->adaptec) | |
1029 | body_size = 8; | |
1030 | #endif | |
1031 | ||
1032 | if (c->limit_sectors) | |
1033 | max_sectors = I2O_MAX_SECTORS_LIMITED; | |
1034 | else | |
1035 | max_sectors = I2O_MAX_SECTORS; | |
1da177e4 LT |
1036 | |
1037 | /* skip devices which are used by IOP */ | |
1038 | if (i2o_dev->lct_data.user_tid != 0xfff) { | |
1039 | osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid); | |
1040 | return -ENODEV; | |
1041 | } | |
1042 | ||
1da177e4 LT |
1043 | if (i2o_device_claim(i2o_dev)) { |
1044 | osm_warn("Unable to claim device. Installation aborted\n"); | |
1045 | rc = -EFAULT; | |
1046 | goto exit; | |
1047 | } | |
1048 | ||
1049 | i2o_blk_dev = i2o_block_device_alloc(); | |
1050 | if (IS_ERR(i2o_blk_dev)) { | |
1051 | osm_err("could not alloc a new I2O block device"); | |
1052 | rc = PTR_ERR(i2o_blk_dev); | |
1053 | goto claim_release; | |
1054 | } | |
1055 | ||
1056 | i2o_blk_dev->i2o_dev = i2o_dev; | |
1057 | dev_set_drvdata(dev, i2o_blk_dev); | |
1058 | ||
1059 | /* setup gendisk */ | |
1060 | gd = i2o_blk_dev->gd; | |
1061 | gd->first_minor = unit << 4; | |
1062 | sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit); | |
1da177e4 LT |
1063 | gd->driverfs_dev = &i2o_dev->device; |
1064 | ||
1065 | /* setup request queue */ | |
1066 | queue = gd->queue; | |
1067 | queue->queuedata = i2o_blk_dev; | |
1068 | ||
086fa5ff | 1069 | blk_queue_max_hw_sectors(queue, max_sectors); |
8a78362c | 1070 | blk_queue_max_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); |