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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 | ||
f10378ff ML |
151 | /** |
152 | * i2o_block_issue_flush - device-flush interface for block-layer | |
153 | * @queue: the request queue of the device which should be flushed | |
154 | * @disk: gendisk | |
155 | * @error_sector: error offset | |
156 | * | |
157 | * Helper function to provide flush functionality to block-layer. | |
158 | * | |
159 | * Returns 0 on success or negative error code on failure. | |
160 | */ | |
161 | ||
162 | static int i2o_block_issue_flush(request_queue_t * queue, struct gendisk *disk, | |
163 | sector_t * error_sector) | |
164 | { | |
165 | struct i2o_block_device *i2o_blk_dev = queue->queuedata; | |
166 | int rc = -ENODEV; | |
167 | ||
168 | if (likely(i2o_blk_dev)) | |
169 | rc = i2o_block_device_flush(i2o_blk_dev->i2o_dev); | |
170 | ||
171 | return rc; | |
172 | } | |
173 | ||
1da177e4 LT |
174 | /** |
175 | * i2o_block_device_mount - Mount (load) the media of device dev | |
176 | * @dev: I2O device which should receive the mount request | |
177 | * @media_id: Media Identifier | |
178 | * | |
179 | * Load a media into drive. Identifier should be set to -1, because the | |
180 | * spec does not support any other value. | |
181 | * | |
182 | * Returns 0 on success or negative error code on failure. | |
183 | */ | |
184 | static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id) | |
185 | { | |
a1a5ea70 ML |
186 | struct i2o_message *msg; |
187 | ||
188 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); | |
189 | if (IS_ERR(msg)) | |
190 | return PTR_ERR(msg); | |
191 | ||
192 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); | |
193 | msg->u.head[1] = | |
194 | cpu_to_le32(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev-> | |
195 | lct_data.tid); | |
196 | msg->body[0] = cpu_to_le32(-1); | |
197 | msg->body[1] = cpu_to_le32(0x00000000); | |
1da177e4 LT |
198 | osm_debug("Mounting...\n"); |
199 | ||
a1a5ea70 | 200 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
201 | }; |
202 | ||
203 | /** | |
204 | * i2o_block_device_lock - Locks the media of device dev | |
205 | * @dev: I2O device which should receive the lock request | |
206 | * @media_id: Media Identifier | |
207 | * | |
208 | * Lock media of device dev to prevent removal. The media identifier | |
209 | * should be set to -1, because the spec does not support any other value. | |
210 | * | |
211 | * Returns 0 on success or negative error code on failure. | |
212 | */ | |
213 | static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) | |
214 | { | |
a1a5ea70 | 215 | struct i2o_message *msg; |
1da177e4 | 216 | |
a1a5ea70 ML |
217 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); |
218 | if (IS_ERR(msg) == I2O_QUEUE_EMPTY) | |
219 | return PTR_ERR(msg); | |
1da177e4 | 220 | |
a1a5ea70 ML |
221 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
222 | msg->u.head[1] = | |
223 | cpu_to_le32(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev-> | |
224 | lct_data.tid); | |
225 | msg->body[0] = cpu_to_le32(-1); | |
1da177e4 LT |
226 | osm_debug("Locking...\n"); |
227 | ||
a1a5ea70 | 228 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
229 | }; |
230 | ||
231 | /** | |
232 | * i2o_block_device_unlock - Unlocks the media of device dev | |
233 | * @dev: I2O device which should receive the unlocked request | |
234 | * @media_id: Media Identifier | |
235 | * | |
236 | * Unlocks the media in device dev. The media identifier should be set to | |
237 | * -1, because the spec does not support any other value. | |
238 | * | |
239 | * Returns 0 on success or negative error code on failure. | |
240 | */ | |
241 | static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id) | |
242 | { | |
a1a5ea70 | 243 | struct i2o_message *msg; |
1da177e4 | 244 | |
a1a5ea70 ML |
245 | msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); |
246 | if (IS_ERR(msg)) | |
247 | return PTR_ERR(msg); | |
1da177e4 | 248 | |
a1a5ea70 ML |
249 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
250 | msg->u.head[1] = | |
251 | cpu_to_le32(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev-> | |
252 | lct_data.tid); | |
253 | msg->body[0] = cpu_to_le32(media_id); | |
1da177e4 LT |
254 | osm_debug("Unlocking...\n"); |
255 | ||
a1a5ea70 | 256 | return i2o_msg_post_wait(dev->iop, msg, 2); |
1da177e4 LT |
257 | }; |
258 | ||
259 | /** | |
260 | * i2o_block_device_power - Power management for device dev | |
261 | * @dev: I2O device which should receive the power management request | |
262 | * @operation: Operation which should be send | |
263 | * | |
264 | * Send a power management request to the device dev. | |
265 | * | |
266 | * Returns 0 on success or negative error code on failure. | |
267 | */ | |
268 | static int i2o_block_device_power(struct i2o_block_device *dev, u8 op) | |
269 | { | |
270 | struct i2o_device *i2o_dev = dev->i2o_dev; | |
271 | struct i2o_controller *c = i2o_dev->iop; | |
a1a5ea70 | 272 | struct i2o_message *msg; |
1da177e4 LT |
273 | int rc; |
274 | ||
a1a5ea70 ML |
275 | msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); |
276 | if (IS_ERR(msg)) | |
277 | return PTR_ERR(msg); | |
1da177e4 | 278 | |
a1a5ea70 ML |
279 | msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0); |
280 | msg->u.head[1] = | |
281 | cpu_to_le32(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev-> | |
282 | lct_data.tid); | |
283 | msg->body[0] = cpu_to_le32(op << 24); | |
1da177e4 LT |
284 | osm_debug("Power...\n"); |
285 | ||
a1a5ea70 | 286 | rc = i2o_msg_post_wait(c, msg, 60); |
1da177e4 LT |
287 | if (!rc) |
288 | dev->power = op; | |
289 | ||
290 | return rc; | |
291 | }; | |
292 | ||
293 | /** | |
294 | * i2o_block_request_alloc - Allocate an I2O block request struct | |
295 | * | |
296 | * Allocates an I2O block request struct and initialize the list. | |
297 | * | |
298 | * Returns a i2o_block_request pointer on success or negative error code | |
299 | * on failure. | |
300 | */ | |
301 | static inline struct i2o_block_request *i2o_block_request_alloc(void) | |
302 | { | |
303 | struct i2o_block_request *ireq; | |
304 | ||
305 | ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC); | |
306 | if (!ireq) | |
307 | return ERR_PTR(-ENOMEM); | |
308 | ||
309 | INIT_LIST_HEAD(&ireq->queue); | |
310 | ||
311 | return ireq; | |
312 | }; | |
313 | ||
314 | /** | |
315 | * i2o_block_request_free - Frees a I2O block request | |
316 | * @ireq: I2O block request which should be freed | |
317 | * | |
318 | * Fres the allocated memory (give it back to the request mempool). | |
319 | */ | |
320 | static inline void i2o_block_request_free(struct i2o_block_request *ireq) | |
321 | { | |
322 | mempool_free(ireq, i2o_blk_req_pool.pool); | |
323 | }; | |
324 | ||
325 | /** | |
326 | * i2o_block_sglist_alloc - Allocate the SG list and map it | |
f10378ff | 327 | * @c: I2O controller to which the request belongs |
1da177e4 LT |
328 | * @ireq: I2O block request |
329 | * | |
f10378ff | 330 | * Builds the SG list and map it to be accessable by the controller. |
1da177e4 | 331 | * |
f10378ff | 332 | * Returns 0 on failure or 1 on success. |
1da177e4 | 333 | */ |
f10378ff ML |
334 | static inline int i2o_block_sglist_alloc(struct i2o_controller *c, |
335 | struct i2o_block_request *ireq, | |
a1a5ea70 | 336 | u32 ** mptr) |
1da177e4 | 337 | { |
1da177e4 | 338 | int nents; |
f10378ff | 339 | enum dma_data_direction direction; |
1da177e4 | 340 | |
f10378ff | 341 | ireq->dev = &c->pdev->dev; |
1da177e4 LT |
342 | nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table); |
343 | ||
344 | if (rq_data_dir(ireq->req) == READ) | |
f10378ff | 345 | direction = PCI_DMA_FROMDEVICE; |
1da177e4 | 346 | else |
f10378ff | 347 | direction = PCI_DMA_TODEVICE; |
1da177e4 | 348 | |
f10378ff | 349 | ireq->sg_nents = nents; |
1da177e4 | 350 | |
f10378ff | 351 | return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr); |
1da177e4 LT |
352 | }; |
353 | ||
354 | /** | |
355 | * i2o_block_sglist_free - Frees the SG list | |
356 | * @ireq: I2O block request from which the SG should be freed | |
357 | * | |
358 | * Frees the SG list from the I2O block request. | |
359 | */ | |
360 | static inline void i2o_block_sglist_free(struct i2o_block_request *ireq) | |
361 | { | |
f10378ff | 362 | enum dma_data_direction direction; |
1da177e4 | 363 | |
f10378ff ML |
364 | if (rq_data_dir(ireq->req) == READ) |
365 | direction = PCI_DMA_FROMDEVICE; | |
366 | else | |
367 | direction = PCI_DMA_TODEVICE; | |
368 | ||
369 | dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction); | |
1da177e4 LT |
370 | }; |
371 | ||
372 | /** | |
373 | * i2o_block_prep_req_fn - Allocates I2O block device specific struct | |
374 | * @q: request queue for the request | |
375 | * @req: the request to prepare | |
376 | * | |
377 | * Allocate the necessary i2o_block_request struct and connect it to | |
378 | * the request. This is needed that we not loose the SG list later on. | |
379 | * | |
380 | * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure. | |
381 | */ | |
382 | static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req) | |
383 | { | |
384 | struct i2o_block_device *i2o_blk_dev = q->queuedata; | |
385 | struct i2o_block_request *ireq; | |
386 | ||
f10378ff ML |
387 | if (unlikely(!i2o_blk_dev)) { |
388 | osm_err("block device already removed\n"); | |
389 | return BLKPREP_KILL; | |
390 | } | |
391 | ||
1da177e4 LT |
392 | /* request is already processed by us, so return */ |
393 | if (req->flags & REQ_SPECIAL) { | |
394 | osm_debug("REQ_SPECIAL already set!\n"); | |
395 | req->flags |= REQ_DONTPREP; | |
396 | return BLKPREP_OK; | |
397 | } | |
398 | ||
399 | /* connect the i2o_block_request to the request */ | |
400 | if (!req->special) { | |
401 | ireq = i2o_block_request_alloc(); | |
402 | if (unlikely(IS_ERR(ireq))) { | |
403 | osm_debug("unable to allocate i2o_block_request!\n"); | |
404 | return BLKPREP_DEFER; | |
405 | } | |
406 | ||
407 | ireq->i2o_blk_dev = i2o_blk_dev; | |
408 | req->special = ireq; | |
409 | ireq->req = req; | |
410 | } else | |
411 | ireq = req->special; | |
412 | ||
413 | /* do not come back here */ | |
414 | req->flags |= REQ_DONTPREP | REQ_SPECIAL; | |
415 | ||
416 | return BLKPREP_OK; | |
417 | }; | |
418 | ||
419 | /** | |
420 | * i2o_block_delayed_request_fn - delayed request queue function | |
421 | * delayed_request: the delayed request with the queue to start | |
422 | * | |
423 | * If the request queue is stopped for a disk, and there is no open | |
424 | * request, a new event is created, which calls this function to start | |
425 | * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never | |
426 | * be started again. | |
427 | */ | |
428 | static void i2o_block_delayed_request_fn(void *delayed_request) | |
429 | { | |
430 | struct i2o_block_delayed_request *dreq = delayed_request; | |
431 | struct request_queue *q = dreq->queue; | |
432 | unsigned long flags; | |
433 | ||
434 | spin_lock_irqsave(q->queue_lock, flags); | |
435 | blk_start_queue(q); | |
436 | spin_unlock_irqrestore(q->queue_lock, flags); | |
437 | kfree(dreq); | |
438 | }; | |
439 | ||
440 | /** | |
f88e119c ML |
441 | * i2o_block_end_request - Post-processing of completed commands |
442 | * @req: request which should be completed | |
443 | * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error | |
444 | * @nr_bytes: number of bytes to complete | |
1da177e4 | 445 | * |
f88e119c | 446 | * Mark the request as complete. The lock must not be held when entering. |
1da177e4 LT |
447 | * |
448 | */ | |
f88e119c ML |
449 | static void i2o_block_end_request(struct request *req, int uptodate, |
450 | int nr_bytes) | |
1da177e4 | 451 | { |
f88e119c ML |
452 | struct i2o_block_request *ireq = req->special; |
453 | struct i2o_block_device *dev = ireq->i2o_blk_dev; | |
f10378ff | 454 | request_queue_t *q = req->q; |
1da177e4 LT |
455 | unsigned long flags; |
456 | ||
f88e119c | 457 | if (end_that_request_chunk(req, uptodate, nr_bytes)) { |
f10378ff | 458 | int leftover = (req->hard_nr_sectors << KERNEL_SECTOR_SHIFT); |
1da177e4 | 459 | |
f88e119c ML |
460 | if (blk_pc_request(req)) |
461 | leftover = req->data_len; | |
1da177e4 | 462 | |
f88e119c ML |
463 | if (end_io_error(uptodate)) |
464 | end_that_request_chunk(req, 0, leftover); | |
465 | } | |
1da177e4 | 466 | |
f88e119c | 467 | add_disk_randomness(req->rq_disk); |
1da177e4 | 468 | |
f88e119c | 469 | spin_lock_irqsave(q->queue_lock, flags); |
1da177e4 | 470 | |
8ffdc655 | 471 | end_that_request_last(req, uptodate); |
f10378ff ML |
472 | |
473 | if (likely(dev)) { | |
474 | dev->open_queue_depth--; | |
475 | list_del(&ireq->queue); | |
476 | } | |
1da177e4 | 477 | |
f88e119c | 478 | blk_start_queue(q); |
1da177e4 | 479 | |
f88e119c | 480 | spin_unlock_irqrestore(q->queue_lock, flags); |
1da177e4 | 481 | |
f88e119c ML |
482 | i2o_block_sglist_free(ireq); |
483 | i2o_block_request_free(ireq); | |
484 | }; | |
1da177e4 | 485 | |
f88e119c ML |
486 | /** |
487 | * i2o_block_reply - Block OSM reply handler. | |
488 | * @c: I2O controller from which the message arrives | |
489 | * @m: message id of reply | |
490 | * qmsg: the actuall I2O message reply | |
491 | * | |
492 | * This function gets all the message replies. | |
493 | * | |
494 | */ | |
495 | static int i2o_block_reply(struct i2o_controller *c, u32 m, | |
496 | struct i2o_message *msg) | |
497 | { | |
498 | struct request *req; | |
499 | int uptodate = 1; | |
1da177e4 LT |
500 | |
501 | req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); | |
502 | if (unlikely(!req)) { | |
503 | osm_err("NULL reply received!\n"); | |
504 | return -1; | |
505 | } | |
506 | ||
1da177e4 LT |
507 | /* |
508 | * Lets see what is cooking. We stuffed the | |
509 | * request in the context. | |
510 | */ | |
511 | ||
f88e119c ML |
512 | if ((le32_to_cpu(msg->body[0]) >> 24) != 0) { |
513 | u32 status = le32_to_cpu(msg->body[0]); | |
1da177e4 LT |
514 | /* |
515 | * Device not ready means two things. One is that the | |
516 | * the thing went offline (but not a removal media) | |
517 | * | |
518 | * The second is that you have a SuperTrak 100 and the | |
519 | * firmware got constipated. Unlike standard i2o card | |
520 | * setups the supertrak returns an error rather than | |
521 | * blocking for the timeout in these cases. | |
522 | * | |
523 | * Don't stick a supertrak100 into cache aggressive modes | |
524 | */ | |
525 | ||
f10378ff ML |
526 | osm_err("TID %03x error status: 0x%02x, detailed status: " |
527 | "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff), | |
f88e119c | 528 | status >> 24, status & 0xffff); |
1da177e4 | 529 | |
f88e119c | 530 | req->errors++; |
1da177e4 | 531 | |
f88e119c ML |
532 | uptodate = 0; |
533 | } | |
1da177e4 | 534 | |
f88e119c | 535 | i2o_block_end_request(req, uptodate, le32_to_cpu(msg->body[1])); |
1da177e4 LT |
536 | |
537 | return 1; | |
538 | }; | |
539 | ||
540 | static void i2o_block_event(struct i2o_event *evt) | |
541 | { | |
9e87545f | 542 | osm_debug("event received\n"); |
223230e7 | 543 | kfree(evt); |
1da177e4 LT |
544 | }; |
545 | ||
546 | /* | |
547 | * SCSI-CAM for ioctl geometry mapping | |
548 | * Duplicated with SCSI - this should be moved into somewhere common | |
549 | * perhaps genhd ? | |
550 | * | |
551 | * LBA -> CHS mapping table taken from: | |
552 | * | |
553 | * "Incorporating the I2O Architecture into BIOS for Intel Architecture | |
554 | * Platforms" | |
555 | * | |
556 | * This is an I2O document that is only available to I2O members, | |
557 | * not developers. | |
558 | * | |
559 | * From my understanding, this is how all the I2O cards do this | |
560 | * | |
561 | * Disk Size | Sectors | Heads | Cylinders | |
562 | * ---------------+---------+-------+------------------- | |
563 | * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512) | |
564 | * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512) | |
565 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
566 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) | |
567 | * | |
568 | */ | |
569 | #define BLOCK_SIZE_528M 1081344 | |
570 | #define BLOCK_SIZE_1G 2097152 | |
571 | #define BLOCK_SIZE_21G 4403200 | |
572 | #define BLOCK_SIZE_42G 8806400 | |
573 | #define BLOCK_SIZE_84G 17612800 | |
574 | ||
575 | static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls, | |
576 | unsigned char *hds, unsigned char *secs) | |
577 | { | |
578 | unsigned long heads, sectors, cylinders; | |
579 | ||
580 | sectors = 63L; /* Maximize sectors per track */ | |
581 | if (capacity <= BLOCK_SIZE_528M) | |
582 | heads = 16; | |
583 | else if (capacity <= BLOCK_SIZE_1G) | |
584 | heads = 32; | |
585 | else if (capacity <= BLOCK_SIZE_21G) | |
586 | heads = 64; | |
587 | else if (capacity <= BLOCK_SIZE_42G) | |
588 | heads = 128; | |
589 | else | |
590 | heads = 255; | |
591 | ||
592 | cylinders = (unsigned long)capacity / (heads * sectors); | |
593 | ||
594 | *cyls = (unsigned short)cylinders; /* Stuff return values */ | |
595 | *secs = (unsigned char)sectors; | |
596 | *hds = (unsigned char)heads; | |
597 | } | |
598 | ||
599 | /** | |
600 | * i2o_block_open - Open the block device | |
601 | * | |
602 | * Power up the device, mount and lock the media. This function is called, | |
603 | * if the block device is opened for access. | |
604 | * | |
605 | * Returns 0 on success or negative error code on failure. | |
606 | */ | |
607 | static int i2o_block_open(struct inode *inode, struct file *file) | |
608 | { | |
609 | struct i2o_block_device *dev = inode->i_bdev->bd_disk->private_data; | |
610 | ||
611 | if (!dev->i2o_dev) | |
612 | return -ENODEV; | |
613 | ||
614 | if (dev->power > 0x1f) | |
615 | i2o_block_device_power(dev, 0x02); | |
616 | ||
617 | i2o_block_device_mount(dev->i2o_dev, -1); | |
618 | ||
619 | i2o_block_device_lock(dev->i2o_dev, -1); | |
620 | ||
621 | osm_debug("Ready.\n"); | |
622 | ||
623 | return 0; | |
624 | }; | |
625 | ||
626 | /** | |
627 | * i2o_block_release - Release the I2O block device | |
628 | * | |
629 | * Unlock and unmount the media, and power down the device. Gets called if | |
630 | * the block device is closed. | |
631 | * | |
632 | * Returns 0 on success or negative error code on failure. | |
633 | */ | |
634 | static int i2o_block_release(struct inode *inode, struct file *file) | |
635 | { | |
636 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
637 | struct i2o_block_device *dev = disk->private_data; | |
638 | u8 operation; | |
639 | ||
640 | /* | |
641 | * This is to deail with the case of an application | |
642 | * opening a device and then the device dissapears while | |
643 | * it's in use, and then the application tries to release | |
644 | * it. ex: Unmounting a deleted RAID volume at reboot. | |
645 | * If we send messages, it will just cause FAILs since | |
646 | * the TID no longer exists. | |
647 | */ | |
648 | if (!dev->i2o_dev) | |
649 | return 0; | |
650 | ||
651 | i2o_block_device_flush(dev->i2o_dev); | |
652 | ||
653 | i2o_block_device_unlock(dev->i2o_dev, -1); | |
654 | ||
655 | if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */ | |
656 | operation = 0x21; | |
657 | else | |
658 | operation = 0x24; | |
659 | ||
660 | i2o_block_device_power(dev, operation); | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | /** | |
666 | * i2o_block_ioctl - Issue device specific ioctl calls. | |
667 | * @cmd: ioctl command | |
668 | * @arg: arg | |
669 | * | |
670 | * Handles ioctl request for the block device. | |
671 | * | |
672 | * Return 0 on success or negative error on failure. | |
673 | */ | |
674 | static int i2o_block_ioctl(struct inode *inode, struct file *file, | |
675 | unsigned int cmd, unsigned long arg) | |
676 | { | |
677 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
678 | struct i2o_block_device *dev = disk->private_data; | |
679 | void __user *argp = (void __user *)arg; | |
680 | ||
681 | /* Anyone capable of this syscall can do *real bad* things */ | |
682 | ||
683 | if (!capable(CAP_SYS_ADMIN)) | |
684 | return -EPERM; | |
685 | ||
686 | switch (cmd) { | |
687 | case HDIO_GETGEO: | |
688 | { | |
689 | struct hd_geometry g; | |
690 | i2o_block_biosparam(get_capacity(disk), | |
691 | &g.cylinders, &g.heads, &g.sectors); | |
692 | g.start = get_start_sect(inode->i_bdev); | |
693 | return copy_to_user(argp, &g, sizeof(g)) ? -EFAULT : 0; | |
694 | } | |
695 | ||
696 | case BLKI2OGRSTRAT: | |
697 | return put_user(dev->rcache, (int __user *)arg); | |
698 | case BLKI2OGWSTRAT: | |
699 | return put_user(dev->wcache, (int __user *)arg); | |
700 | case BLKI2OSRSTRAT: | |
701 | if (arg < 0 || arg > CACHE_SMARTFETCH) | |
702 | return -EINVAL; | |
703 | dev->rcache = arg; | |
704 | break; | |
705 | case BLKI2OSWSTRAT: | |
706 | if (arg != 0 | |
707 | && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) | |
708 | return -EINVAL; | |
709 | dev->wcache = arg; | |
710 | break; | |
711 | } | |
712 | return -ENOTTY; | |
713 | }; | |
714 | ||
715 | /** | |
716 | * i2o_block_media_changed - Have we seen a media change? | |
717 | * @disk: gendisk which should be verified | |
718 | * | |
719 | * Verifies if the media has changed. | |
720 | * | |
721 | * Returns 1 if the media was changed or 0 otherwise. | |
722 | */ | |
723 | static int i2o_block_media_changed(struct gendisk *disk) | |
724 | { | |
725 | struct i2o_block_device *p = disk->private_data; | |
726 | ||
727 | if (p->media_change_flag) { | |
728 | p->media_change_flag = 0; | |
729 | return 1; | |
730 | } | |
731 | return 0; | |
732 | } | |
733 | ||
734 | /** | |
735 | * i2o_block_transfer - Transfer a request to/from the I2O controller | |
736 | * @req: the request which should be transfered | |
737 | * | |
738 | * This function converts the request into a I2O message. The necessary | |
739 | * DMA buffers are allocated and after everything is setup post the message | |
740 | * to the I2O controller. No cleanup is done by this function. It is done | |
741 | * on the interrupt side when the reply arrives. | |
742 | * | |
743 | * Return 0 on success or negative error code on failure. | |
744 | */ | |
745 | static int i2o_block_transfer(struct request *req) | |
746 | { | |
747 | struct i2o_block_device *dev = req->rq_disk->private_data; | |
f10378ff | 748 | struct i2o_controller *c; |
1da177e4 | 749 | int tid = dev->i2o_dev->lct_data.tid; |
a1a5ea70 ML |
750 | struct i2o_message *msg; |
751 | u32 *mptr; | |
1da177e4 | 752 | struct i2o_block_request *ireq = req->special; |
1da177e4 | 753 | u32 tcntxt; |
f10378ff ML |
754 | u32 sgl_offset = SGL_OFFSET_8; |
755 | u32 ctl_flags = 0x00000000; | |
1da177e4 | 756 | int rc; |
f10378ff ML |
757 | u32 cmd; |
758 | ||
759 | if (unlikely(!dev->i2o_dev)) { | |
760 | osm_err("transfer to removed drive\n"); | |
761 | rc = -ENODEV; | |
762 | goto exit; | |
763 | } | |
764 | ||
765 | c = dev->i2o_dev->iop; | |
1da177e4 | 766 | |
a1a5ea70 ML |
767 | msg = i2o_msg_get(c); |
768 | if (IS_ERR(msg)) { | |
769 | rc = PTR_ERR(msg); | |
1da177e4 LT |
770 | goto exit; |
771 | } | |
772 | ||
773 | tcntxt = i2o_cntxt_list_add(c, req); | |
774 | if (!tcntxt) { | |
775 | rc = -ENOMEM; | |
776 | goto nop_msg; | |
777 | } | |
778 | ||
a1a5ea70 ML |
779 | msg->u.s.icntxt = cpu_to_le32(i2o_block_driver.context); |
780 | msg->u.s.tcntxt = cpu_to_le32(tcntxt); | |
1da177e4 | 781 | |
f10378ff | 782 | mptr = &msg->body[0]; |
1da177e4 LT |
783 | |
784 | if (rq_data_dir(req) == READ) { | |
f10378ff ML |
785 | cmd = I2O_CMD_BLOCK_READ << 24; |
786 | ||
1da177e4 | 787 | switch (dev->rcache) { |
1da177e4 | 788 | case CACHE_PREFETCH: |
f10378ff | 789 | ctl_flags = 0x201F0008; |
1da177e4 | 790 | break; |
f10378ff | 791 | |
1da177e4 LT |
792 | case CACHE_SMARTFETCH: |
793 | if (req->nr_sectors > 16) | |
f10378ff | 794 | ctl_flags = 0x201F0008; |
1da177e4 | 795 | else |
f10378ff ML |
796 | ctl_flags = 0x001F0000; |
797 | break; | |
798 | ||
799 | default: | |
1da177e4 LT |
800 | break; |
801 | } | |
802 | } else { | |
f10378ff ML |
803 | cmd = I2O_CMD_BLOCK_WRITE << 24; |
804 | ||
1da177e4 | 805 | switch (dev->wcache) { |
1da177e4 | 806 | case CACHE_WRITETHROUGH: |
f10378ff | 807 | ctl_flags = 0x001F0008; |
1da177e4 LT |
808 | break; |
809 | case CACHE_WRITEBACK: | |
f10378ff | 810 | ctl_flags = 0x001F0010; |
1da177e4 LT |
811 | break; |
812 | case CACHE_SMARTBACK: | |
813 | if (req->nr_sectors > 16) | |
f10378ff | 814 | ctl_flags = 0x001F0004; |
1da177e4 | 815 | else |
f10378ff | 816 | ctl_flags = 0x001F0010; |
1da177e4 LT |
817 | break; |
818 | case CACHE_SMARTTHROUGH: | |
819 | if (req->nr_sectors > 16) | |
f10378ff | 820 | ctl_flags = 0x001F0004; |
1da177e4 | 821 | else |
f10378ff ML |
822 | ctl_flags = 0x001F0010; |
823 | default: | |
824 | break; | |
825 | } | |
826 | } | |
827 | ||
828 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
829 | if (c->adaptec) { | |
830 | u8 cmd[10]; | |
831 | u32 scsi_flags; | |
832 | u16 hwsec = queue_hardsect_size(req->q) >> KERNEL_SECTOR_SHIFT; | |
833 | ||
834 | memset(cmd, 0, 10); | |
835 | ||
836 | sgl_offset = SGL_OFFSET_12; | |
837 | ||
a1a5ea70 ML |
838 | msg->u.head[1] = |
839 | cpu_to_le32(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid); | |
f10378ff | 840 | |
a1a5ea70 ML |
841 | *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC); |
842 | *mptr++ = cpu_to_le32(tid); | |
f10378ff ML |
843 | |
844 | /* | |
845 | * ENABLE_DISCONNECT | |
846 | * SIMPLE_TAG | |
847 | * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME | |
848 | */ | |
849 | if (rq_data_dir(req) == READ) { | |
2e1973a3 | 850 | cmd[0] = READ_10; |
f10378ff ML |
851 | scsi_flags = 0x60a0000a; |
852 | } else { | |
2e1973a3 | 853 | cmd[0] = WRITE_10; |
f10378ff | 854 | scsi_flags = 0xa0a0000a; |
1da177e4 | 855 | } |
f10378ff | 856 | |
a1a5ea70 | 857 | *mptr++ = cpu_to_le32(scsi_flags); |
f10378ff ML |
858 | |
859 | *((u32 *) & cmd[2]) = cpu_to_be32(req->sector * hwsec); | |
860 | *((u16 *) & cmd[7]) = cpu_to_be16(req->nr_sectors * hwsec); | |
861 | ||
a1a5ea70 | 862 | memcpy(mptr, cmd, 10); |
f10378ff | 863 | mptr += 4; |
a1a5ea70 | 864 | *mptr++ = cpu_to_le32(req->nr_sectors << KERNEL_SECTOR_SHIFT); |
f10378ff ML |
865 | } else |
866 | #endif | |
867 | { | |
a1a5ea70 ML |
868 | msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); |
869 | *mptr++ = cpu_to_le32(ctl_flags); | |
870 | *mptr++ = cpu_to_le32(req->nr_sectors << KERNEL_SECTOR_SHIFT); | |
871 | *mptr++ = | |
872 | cpu_to_le32((u32) (req->sector << KERNEL_SECTOR_SHIFT)); | |
873 | *mptr++ = | |
874 | cpu_to_le32(req->sector >> (32 - KERNEL_SECTOR_SHIFT)); | |
1da177e4 LT |
875 | } |
876 | ||
f10378ff ML |
877 | if (!i2o_block_sglist_alloc(c, ireq, &mptr)) { |
878 | rc = -ENOMEM; | |
879 | goto context_remove; | |
1da177e4 LT |
880 | } |
881 | ||
a1a5ea70 ML |
882 | msg->u.head[0] = |
883 | cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset); | |
1da177e4 LT |
884 | |
885 | list_add_tail(&ireq->queue, &dev->open_queue); | |
886 | dev->open_queue_depth++; | |
887 | ||
a1a5ea70 | 888 | i2o_msg_post(c, msg); |
1da177e4 LT |
889 | |
890 | return 0; | |
891 | ||
892 | context_remove: | |
893 | i2o_cntxt_list_remove(c, req); | |
894 | ||
895 | nop_msg: | |
a1a5ea70 | 896 | i2o_msg_nop(c, msg); |
1da177e4 LT |
897 | |
898 | exit: | |
899 | return rc; | |
900 | }; | |
901 | ||
902 | /** | |
903 | * i2o_block_request_fn - request queue handling function | |
904 | * q: request queue from which the request could be fetched | |
905 | * | |
906 | * Takes the next request from the queue, transfers it and if no error | |
907 | * occurs dequeue it from the queue. On arrival of the reply the message | |
908 | * will be processed further. If an error occurs requeue the request. | |
909 | */ | |
910 | static void i2o_block_request_fn(struct request_queue *q) | |
911 | { | |
912 | struct request *req; | |
913 | ||
914 | while (!blk_queue_plugged(q)) { | |
915 | req = elv_next_request(q); | |
916 | if (!req) | |
917 | break; | |
918 | ||
919 | if (blk_fs_request(req)) { | |
920 | struct i2o_block_delayed_request *dreq; | |
921 | struct i2o_block_request *ireq = req->special; | |
922 | unsigned int queue_depth; | |
923 | ||
924 | queue_depth = ireq->i2o_blk_dev->open_queue_depth; | |
925 | ||
f10378ff | 926 | if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) { |
1da177e4 LT |
927 | if (!i2o_block_transfer(req)) { |
928 | blkdev_dequeue_request(req); | |
929 | continue; | |
f10378ff ML |
930 | } else |
931 | osm_info("transfer error\n"); | |
932 | } | |
1da177e4 LT |
933 | |
934 | if (queue_depth) | |
935 | break; | |
936 | ||
937 | /* stop the queue and retry later */ | |
938 | dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC); | |
939 | if (!dreq) | |
940 | continue; | |
941 | ||
942 | dreq->queue = q; | |
943 | INIT_WORK(&dreq->work, i2o_block_delayed_request_fn, | |
944 | dreq); | |
945 | ||
1da177e4 LT |
946 | if (!queue_delayed_work(i2o_block_driver.event_queue, |
947 | &dreq->work, | |
948 | I2O_BLOCK_RETRY_TIME)) | |
949 | kfree(dreq); | |
950 | else { | |
951 | blk_stop_queue(q); | |
952 | break; | |
953 | } | |
954 | } else | |
955 | end_request(req, 0); | |
956 | } | |
957 | }; | |
958 | ||
959 | /* I2O Block device operations definition */ | |
960 | static struct block_device_operations i2o_block_fops = { | |
961 | .owner = THIS_MODULE, | |
962 | .open = i2o_block_open, | |
963 | .release = i2o_block_release, | |
964 | .ioctl = i2o_block_ioctl, | |
965 | .media_changed = i2o_block_media_changed | |
966 | }; | |
967 | ||
968 | /** | |
969 | * i2o_block_device_alloc - Allocate memory for a I2O Block device | |
970 | * | |
971 | * Allocate memory for the i2o_block_device struct, gendisk and request | |
972 | * queue and initialize them as far as no additional information is needed. | |
973 | * | |
974 | * Returns a pointer to the allocated I2O Block device on succes or a | |
975 | * negative error code on failure. | |
976 | */ | |
977 | static struct i2o_block_device *i2o_block_device_alloc(void) | |
978 | { | |
979 | struct i2o_block_device *dev; | |
980 | struct gendisk *gd; | |
981 | struct request_queue *queue; | |
982 | int rc; | |
983 | ||
f6ed39a6 | 984 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
985 | if (!dev) { |
986 | osm_err("Insufficient memory to allocate I2O Block disk.\n"); | |
987 | rc = -ENOMEM; | |
988 | goto exit; | |
989 | } | |
1da177e4 LT |
990 | |
991 | INIT_LIST_HEAD(&dev->open_queue); | |
992 | spin_lock_init(&dev->lock); | |
993 | dev->rcache = CACHE_PREFETCH; | |
994 | dev->wcache = CACHE_WRITEBACK; | |
995 | ||
996 | /* allocate a gendisk with 16 partitions */ | |
997 | gd = alloc_disk(16); | |
998 | if (!gd) { | |
999 | osm_err("Insufficient memory to allocate gendisk.\n"); | |
1000 | rc = -ENOMEM; | |
1001 | goto cleanup_dev; | |
1002 | } | |
1003 | ||
1004 | /* initialize the request queue */ | |
1005 | queue = blk_init_queue(i2o_block_request_fn, &dev->lock); | |
1006 | if (!queue) { | |
1007 | osm_err("Insufficient memory to allocate request queue.\n"); | |
1008 | rc = -ENOMEM; | |
1009 | goto cleanup_queue; | |
1010 | } | |
1011 | ||
1012 | blk_queue_prep_rq(queue, i2o_block_prep_req_fn); | |
f10378ff | 1013 | blk_queue_issue_flush_fn(queue, i2o_block_issue_flush); |
1da177e4 LT |
1014 | |
1015 | gd->major = I2O_MAJOR; | |
1016 | gd->queue = queue; | |
1017 | gd->fops = &i2o_block_fops; | |
1018 | gd->private_data = dev; | |
1019 | ||
1020 | dev->gd = gd; | |
1021 | ||
1022 | return dev; | |
1023 | ||
1024 | cleanup_queue: | |
1025 | put_disk(gd); | |
1026 | ||
1027 | cleanup_dev: | |
1028 | kfree(dev); | |
1029 | ||
1030 | exit: | |
1031 | return ERR_PTR(rc); | |
1032 | }; | |
1033 | ||
1034 | /** | |
1035 | * i2o_block_probe - verify if dev is a I2O Block device and install it | |
1036 | * @dev: device to verify if it is a I2O Block device | |
1037 | * | |
1038 | * We only verify if the user_tid of the device is 0xfff and then install | |
1039 | * the device. Otherwise it is used by some other device (e. g. RAID). | |
1040 | * | |
1041 | * Returns 0 on success or negative error code on failure. | |
1042 | */ | |
1043 | static int i2o_block_probe(struct device *dev) | |
1044 | { | |
1045 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
1da177e4 | 1046 | struct i2o_controller *c = i2o_dev->iop; |
f33213ec | 1047 | struct i2o_block_device *i2o_blk_dev; |
1da177e4 LT |
1048 | struct gendisk *gd; |
1049 | struct request_queue *queue; | |
1050 | static int unit = 0; | |
1051 | int rc; | |
1052 | u64 size; | |
1053 | u32 blocksize; | |
f10378ff | 1054 | u16 body_size = 4; |
793fd15d | 1055 | u16 power; |
f10378ff ML |
1056 | unsigned short max_sectors; |
1057 | ||
1058 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
1059 | if (c->adaptec) | |
1060 | body_size = 8; | |
1061 | #endif | |
1062 | ||
1063 | if (c->limit_sectors) | |
1064 | max_sectors = I2O_MAX_SECTORS_LIMITED; | |
1065 | else | |
1066 | max_sectors = I2O_MAX_SECTORS; | |
1da177e4 LT |
1067 | |
1068 | /* skip devices which are used by IOP */ | |
1069 | if (i2o_dev->lct_data.user_tid != 0xfff) { | |
1070 | osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid); | |
1071 | return -ENODEV; | |
1072 | } | |
1073 | ||
1da177e4 LT |
1074 | if (i2o_device_claim(i2o_dev)) { |
1075 | osm_warn("Unable to claim device. Installation aborted\n"); | |
1076 | rc = -EFAULT; | |
1077 | goto exit; | |
1078 | } | |
1079 | ||
1080 | i2o_blk_dev = i2o_block_device_alloc(); | |
1081 | if (IS_ERR(i2o_blk_dev)) { | |
1082 | osm_err("could not alloc a new I2O block device"); | |
1083 | rc = PTR_ERR(i2o_blk_dev); | |
1084 | goto claim_release; | |
1085 | } | |
1086 | ||
1087 | i2o_blk_dev->i2o_dev = i2o_dev; | |
1088 | dev_set_drvdata(dev, i2o_blk_dev); | |
1089 | ||
1090 | /* setup gendisk */ | |
1091 | gd = i2o_blk_dev->gd; | |
1092 | gd->first_minor = unit << 4; | |
1093 | sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit); | |
1094 | sprintf(gd->devfs_name, "i2o/hd%c", 'a' + unit); | |
1095 | gd->driverfs_dev = &i2o_dev->device; | |
1096 | ||
1097 | /* setup request queue */ | |
1098 | queue = gd->queue; | |
1099 | queue->queuedata = i2o_blk_dev; | |
1100 | ||
f10378ff ML |
1101 | blk_queue_max_phys_segments(queue, I2O_MAX_PHYS_SEGMENTS); |
1102 | blk_queue_max_sectors(queue, max_sectors); | |
1103 | blk_queue_max_hw_segments(queue, i2o_sg_tablesize(c, body_size)); | |
1da177e4 | 1104 | |
f10378ff ML |
1105 | osm_debug("max sectors = %d\n", queue->max_phys_segments); |
1106 | osm_debug("phys segments = %d\n", queue->max_sectors); | |
1107 | osm_debug("max hw segments = %d\n", queue->max_hw_segments); | |
1da177e4 LT |
1108 | |
1109 | /* | |
1110 | * Ask for the current media data. If that isn't supported | |
1111 | * then we ask for the device capacity data | |
1112 | */ | |
793fd15d ML |
1113 | if (!i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) || |
1114 | !i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) { | |
1115 | blk_queue_hardsect_size(queue, le32_to_cpu(blocksize)); | |
f10378ff ML |
1116 | } else |
1117 | osm_warn("unable to get blocksize of %s\n", gd->disk_name); | |
1da177e4 | 1118 | |
793fd15d ML |
1119 | if (!i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) || |
1120 | !i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) { | |
1121 | set_capacity(gd, le64_to_cpu(size) >> KERNEL_SECTOR_SHIFT); | |
f10378ff ML |
1122 | } else |
1123 | osm_warn("could not get size of %s\n", gd->disk_name); | |
f88e119c | 1124 | |
793fd15d ML |
1125 | if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2)) |
1126 | i2o_blk_dev->power = power; | |
1da177e4 | 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); |