Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Block OSM |
| 3 | * |
| 4 | * Copyright (C) 1999-2002 Red Hat Software |
| 5 | * |
| 6 | * Written by Alan Cox, Building Number Three Ltd |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the |
| 10 | * Free Software Foundation; either version 2 of the License, or (at your |
| 11 | * option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * General Public License for more details. |
| 17 | * |
| 18 | * For the purpose of avoiding doubt the preferred form of the work |
| 19 | * for making modifications shall be a standards compliant form such |
| 20 | * gzipped tar and not one requiring a proprietary or patent encumbered |
| 21 | * tool to unpack. |
| 22 | * |
| 23 | * Fixes/additions: |
| 24 | * Steve Ralston: |
| 25 | * Multiple device handling error fixes, |
| 26 | * Added a queue depth. |
| 27 | * Alan Cox: |
| 28 | * FC920 has an rmw bug. Dont or in the end marker. |
| 29 | * Removed queue walk, fixed for 64bitness. |
| 30 | * Rewrote much of the code over time |
| 31 | * Added indirect block lists |
| 32 | * Handle 64K limits on many controllers |
| 33 | * Don't use indirects on the Promise (breaks) |
| 34 | * Heavily chop down the queue depths |
| 35 | * Deepak Saxena: |
| 36 | * Independent queues per IOP |
| 37 | * Support for dynamic device creation/deletion |
| 38 | * Code cleanup |
| 39 | * Support for larger I/Os through merge* functions |
| 40 | * (taken from DAC960 driver) |
| 41 | * Boji T Kannanthanam: |
| 42 | * Set the I2O Block devices to be detected in increasing |
| 43 | * order of TIDs during boot. |
| 44 | * Search and set the I2O block device that we boot off |
| 45 | * from as the first device to be claimed (as /dev/i2o/hda) |
| 46 | * Properly attach/detach I2O gendisk structure from the |
| 47 | * system gendisk list. The I2O block devices now appear in |
| 48 | * /proc/partitions. |
| 49 | * Markus Lidel <Markus.Lidel@shadowconnect.com>: |
| 50 | * Minor bugfixes for 2.6. |
| 51 | */ |
| 52 | |
| 53 | #include <linux/module.h> |
| 54 | #include <linux/i2o.h> |
| 55 | |
| 56 | #include <linux/mempool.h> |
| 57 | |
| 58 | #include <linux/genhd.h> |
| 59 | #include <linux/blkdev.h> |
| 60 | #include <linux/hdreg.h> |
| 61 | |
| 62 | #include "i2o_block.h" |
| 63 | |
| 64 | #define OSM_NAME "block-osm" |
Markus Lidel | 9e87545 | 2005-06-23 22:02:21 -0700 | [diff] [blame] | 65 | #define OSM_VERSION "1.287" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define OSM_DESCRIPTION "I2O Block Device OSM" |
| 67 | |
| 68 | static struct i2o_driver i2o_block_driver; |
| 69 | |
| 70 | /* global Block OSM request mempool */ |
| 71 | static struct i2o_block_mempool i2o_blk_req_pool; |
| 72 | |
| 73 | /* Block OSM class handling definition */ |
| 74 | static struct i2o_class_id i2o_block_class_id[] = { |
| 75 | {I2O_CLASS_RANDOM_BLOCK_STORAGE}, |
| 76 | {I2O_CLASS_END} |
| 77 | }; |
| 78 | |
| 79 | /** |
| 80 | * i2o_block_device_free - free the memory of the I2O Block device |
| 81 | * @dev: I2O Block device, which should be cleaned up |
| 82 | * |
| 83 | * Frees the request queue, gendisk and the i2o_block_device structure. |
| 84 | */ |
| 85 | static void i2o_block_device_free(struct i2o_block_device *dev) |
| 86 | { |
| 87 | blk_cleanup_queue(dev->gd->queue); |
| 88 | |
| 89 | put_disk(dev->gd); |
| 90 | |
| 91 | kfree(dev); |
| 92 | }; |
| 93 | |
| 94 | /** |
| 95 | * i2o_block_remove - remove the I2O Block device from the system again |
| 96 | * @dev: I2O Block device which should be removed |
| 97 | * |
| 98 | * Remove gendisk from system and free all allocated memory. |
| 99 | * |
| 100 | * Always returns 0. |
| 101 | */ |
| 102 | static int i2o_block_remove(struct device *dev) |
| 103 | { |
| 104 | struct i2o_device *i2o_dev = to_i2o_device(dev); |
| 105 | struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev); |
| 106 | |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 107 | osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid, |
| 108 | i2o_blk_dev->gd->disk_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0); |
| 111 | |
| 112 | del_gendisk(i2o_blk_dev->gd); |
| 113 | |
| 114 | dev_set_drvdata(dev, NULL); |
| 115 | |
| 116 | i2o_device_claim_release(i2o_dev); |
| 117 | |
| 118 | i2o_block_device_free(i2o_blk_dev); |
| 119 | |
| 120 | return 0; |
| 121 | }; |
| 122 | |
| 123 | /** |
| 124 | * i2o_block_device flush - Flush all dirty data of I2O device dev |
| 125 | * @dev: I2O device which should be flushed |
| 126 | * |
| 127 | * Flushes all dirty data on device dev. |
| 128 | * |
| 129 | * Returns 0 on success or negative error code on failure. |
| 130 | */ |
| 131 | static int i2o_block_device_flush(struct i2o_device *dev) |
| 132 | { |
| 133 | struct i2o_message __iomem *msg; |
| 134 | u32 m; |
| 135 | |
| 136 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); |
| 137 | if (m == I2O_QUEUE_EMPTY) |
| 138 | return -ETIMEDOUT; |
| 139 | |
| 140 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); |
| 141 | writel(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev->lct_data.tid, |
| 142 | &msg->u.head[1]); |
| 143 | writel(60 << 16, &msg->body[0]); |
| 144 | osm_debug("Flushing...\n"); |
| 145 | |
| 146 | return i2o_msg_post_wait(dev->iop, m, 60); |
| 147 | }; |
| 148 | |
| 149 | /** |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 150 | * i2o_block_issue_flush - device-flush interface for block-layer |
| 151 | * @queue: the request queue of the device which should be flushed |
| 152 | * @disk: gendisk |
| 153 | * @error_sector: error offset |
| 154 | * |
| 155 | * Helper function to provide flush functionality to block-layer. |
| 156 | * |
| 157 | * Returns 0 on success or negative error code on failure. |
| 158 | */ |
| 159 | |
| 160 | static int i2o_block_issue_flush(request_queue_t * queue, struct gendisk *disk, |
| 161 | sector_t * error_sector) |
| 162 | { |
| 163 | struct i2o_block_device *i2o_blk_dev = queue->queuedata; |
| 164 | int rc = -ENODEV; |
| 165 | |
| 166 | if (likely(i2o_blk_dev)) |
| 167 | rc = i2o_block_device_flush(i2o_blk_dev->i2o_dev); |
| 168 | |
| 169 | return rc; |
| 170 | } |
| 171 | |
| 172 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | * i2o_block_device_mount - Mount (load) the media of device dev |
| 174 | * @dev: I2O device which should receive the mount request |
| 175 | * @media_id: Media Identifier |
| 176 | * |
| 177 | * Load a media into drive. Identifier should be set to -1, because the |
| 178 | * spec does not support any other value. |
| 179 | * |
| 180 | * Returns 0 on success or negative error code on failure. |
| 181 | */ |
| 182 | static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id) |
| 183 | { |
| 184 | struct i2o_message __iomem *msg; |
| 185 | u32 m; |
| 186 | |
| 187 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); |
| 188 | if (m == I2O_QUEUE_EMPTY) |
| 189 | return -ETIMEDOUT; |
| 190 | |
| 191 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); |
| 192 | writel(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev->lct_data.tid, |
| 193 | &msg->u.head[1]); |
| 194 | writel(-1, &msg->body[0]); |
| 195 | writel(0, &msg->body[1]); |
| 196 | osm_debug("Mounting...\n"); |
| 197 | |
| 198 | return i2o_msg_post_wait(dev->iop, m, 2); |
| 199 | }; |
| 200 | |
| 201 | /** |
| 202 | * i2o_block_device_lock - Locks the media of device dev |
| 203 | * @dev: I2O device which should receive the lock request |
| 204 | * @media_id: Media Identifier |
| 205 | * |
| 206 | * Lock media of device dev to prevent removal. The media identifier |
| 207 | * should be set to -1, because the spec does not support any other value. |
| 208 | * |
| 209 | * Returns 0 on success or negative error code on failure. |
| 210 | */ |
| 211 | static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) |
| 212 | { |
| 213 | struct i2o_message __iomem *msg; |
| 214 | u32 m; |
| 215 | |
| 216 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); |
| 217 | if (m == I2O_QUEUE_EMPTY) |
| 218 | return -ETIMEDOUT; |
| 219 | |
| 220 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); |
| 221 | writel(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid, |
| 222 | &msg->u.head[1]); |
| 223 | writel(-1, &msg->body[0]); |
| 224 | osm_debug("Locking...\n"); |
| 225 | |
| 226 | return i2o_msg_post_wait(dev->iop, m, 2); |
| 227 | }; |
| 228 | |
| 229 | /** |
| 230 | * i2o_block_device_unlock - Unlocks the media of device dev |
| 231 | * @dev: I2O device which should receive the unlocked request |
| 232 | * @media_id: Media Identifier |
| 233 | * |
| 234 | * Unlocks the media in device dev. The media identifier should be set to |
| 235 | * -1, because the spec does not support any other value. |
| 236 | * |
| 237 | * Returns 0 on success or negative error code on failure. |
| 238 | */ |
| 239 | static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id) |
| 240 | { |
| 241 | struct i2o_message __iomem *msg; |
| 242 | u32 m; |
| 243 | |
| 244 | m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET); |
| 245 | if (m == I2O_QUEUE_EMPTY) |
| 246 | return -ETIMEDOUT; |
| 247 | |
| 248 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); |
| 249 | writel(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid, |
| 250 | &msg->u.head[1]); |
| 251 | writel(media_id, &msg->body[0]); |
| 252 | osm_debug("Unlocking...\n"); |
| 253 | |
| 254 | return i2o_msg_post_wait(dev->iop, m, 2); |
| 255 | }; |
| 256 | |
| 257 | /** |
| 258 | * i2o_block_device_power - Power management for device dev |
| 259 | * @dev: I2O device which should receive the power management request |
| 260 | * @operation: Operation which should be send |
| 261 | * |
| 262 | * Send a power management request to the device dev. |
| 263 | * |
| 264 | * Returns 0 on success or negative error code on failure. |
| 265 | */ |
| 266 | static int i2o_block_device_power(struct i2o_block_device *dev, u8 op) |
| 267 | { |
| 268 | struct i2o_device *i2o_dev = dev->i2o_dev; |
| 269 | struct i2o_controller *c = i2o_dev->iop; |
| 270 | struct i2o_message __iomem *msg; |
| 271 | u32 m; |
| 272 | int rc; |
| 273 | |
| 274 | m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET); |
| 275 | if (m == I2O_QUEUE_EMPTY) |
| 276 | return -ETIMEDOUT; |
| 277 | |
| 278 | writel(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); |
| 279 | writel(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev->lct_data. |
| 280 | tid, &msg->u.head[1]); |
| 281 | writel(op << 24, &msg->body[0]); |
| 282 | osm_debug("Power...\n"); |
| 283 | |
| 284 | rc = i2o_msg_post_wait(c, m, 60); |
| 285 | if (!rc) |
| 286 | dev->power = op; |
| 287 | |
| 288 | return rc; |
| 289 | }; |
| 290 | |
| 291 | /** |
| 292 | * i2o_block_request_alloc - Allocate an I2O block request struct |
| 293 | * |
| 294 | * Allocates an I2O block request struct and initialize the list. |
| 295 | * |
| 296 | * Returns a i2o_block_request pointer on success or negative error code |
| 297 | * on failure. |
| 298 | */ |
| 299 | static inline struct i2o_block_request *i2o_block_request_alloc(void) |
| 300 | { |
| 301 | struct i2o_block_request *ireq; |
| 302 | |
| 303 | ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC); |
| 304 | if (!ireq) |
| 305 | return ERR_PTR(-ENOMEM); |
| 306 | |
| 307 | INIT_LIST_HEAD(&ireq->queue); |
| 308 | |
| 309 | return ireq; |
| 310 | }; |
| 311 | |
| 312 | /** |
| 313 | * i2o_block_request_free - Frees a I2O block request |
| 314 | * @ireq: I2O block request which should be freed |
| 315 | * |
| 316 | * Fres the allocated memory (give it back to the request mempool). |
| 317 | */ |
| 318 | static inline void i2o_block_request_free(struct i2o_block_request *ireq) |
| 319 | { |
| 320 | mempool_free(ireq, i2o_blk_req_pool.pool); |
| 321 | }; |
| 322 | |
| 323 | /** |
| 324 | * i2o_block_sglist_alloc - Allocate the SG list and map it |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 325 | * @c: I2O controller to which the request belongs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | * @ireq: I2O block request |
| 327 | * |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 328 | * Builds the SG list and map it to be accessable by the controller. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | * |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 330 | * Returns 0 on failure or 1 on success. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | */ |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 332 | static inline int i2o_block_sglist_alloc(struct i2o_controller *c, |
| 333 | struct i2o_block_request *ireq, |
| 334 | u32 __iomem ** mptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | int nents; |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 337 | enum dma_data_direction direction; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 339 | ireq->dev = &c->pdev->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table); |
| 341 | |
| 342 | if (rq_data_dir(ireq->req) == READ) |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 343 | direction = PCI_DMA_FROMDEVICE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | else |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 345 | direction = PCI_DMA_TODEVICE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 347 | ireq->sg_nents = nents; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 349 | return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | }; |
| 351 | |
| 352 | /** |
| 353 | * i2o_block_sglist_free - Frees the SG list |
| 354 | * @ireq: I2O block request from which the SG should be freed |
| 355 | * |
| 356 | * Frees the SG list from the I2O block request. |
| 357 | */ |
| 358 | static inline void i2o_block_sglist_free(struct i2o_block_request *ireq) |
| 359 | { |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 360 | enum dma_data_direction direction; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 362 | if (rq_data_dir(ireq->req) == READ) |
| 363 | direction = PCI_DMA_FROMDEVICE; |
| 364 | else |
| 365 | direction = PCI_DMA_TODEVICE; |
| 366 | |
| 367 | dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | }; |
| 369 | |
| 370 | /** |
| 371 | * i2o_block_prep_req_fn - Allocates I2O block device specific struct |
| 372 | * @q: request queue for the request |
| 373 | * @req: the request to prepare |
| 374 | * |
| 375 | * Allocate the necessary i2o_block_request struct and connect it to |
| 376 | * the request. This is needed that we not loose the SG list later on. |
| 377 | * |
| 378 | * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure. |
| 379 | */ |
| 380 | static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req) |
| 381 | { |
| 382 | struct i2o_block_device *i2o_blk_dev = q->queuedata; |
| 383 | struct i2o_block_request *ireq; |
| 384 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 385 | if (unlikely(!i2o_blk_dev)) { |
| 386 | osm_err("block device already removed\n"); |
| 387 | return BLKPREP_KILL; |
| 388 | } |
| 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | /* request is already processed by us, so return */ |
| 391 | if (req->flags & REQ_SPECIAL) { |
| 392 | osm_debug("REQ_SPECIAL already set!\n"); |
| 393 | req->flags |= REQ_DONTPREP; |
| 394 | return BLKPREP_OK; |
| 395 | } |
| 396 | |
| 397 | /* connect the i2o_block_request to the request */ |
| 398 | if (!req->special) { |
| 399 | ireq = i2o_block_request_alloc(); |
| 400 | if (unlikely(IS_ERR(ireq))) { |
| 401 | osm_debug("unable to allocate i2o_block_request!\n"); |
| 402 | return BLKPREP_DEFER; |
| 403 | } |
| 404 | |
| 405 | ireq->i2o_blk_dev = i2o_blk_dev; |
| 406 | req->special = ireq; |
| 407 | ireq->req = req; |
| 408 | } else |
| 409 | ireq = req->special; |
| 410 | |
| 411 | /* do not come back here */ |
| 412 | req->flags |= REQ_DONTPREP | REQ_SPECIAL; |
| 413 | |
| 414 | return BLKPREP_OK; |
| 415 | }; |
| 416 | |
| 417 | /** |
| 418 | * i2o_block_delayed_request_fn - delayed request queue function |
| 419 | * delayed_request: the delayed request with the queue to start |
| 420 | * |
| 421 | * If the request queue is stopped for a disk, and there is no open |
| 422 | * request, a new event is created, which calls this function to start |
| 423 | * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never |
| 424 | * be started again. |
| 425 | */ |
| 426 | static void i2o_block_delayed_request_fn(void *delayed_request) |
| 427 | { |
| 428 | struct i2o_block_delayed_request *dreq = delayed_request; |
| 429 | struct request_queue *q = dreq->queue; |
| 430 | unsigned long flags; |
| 431 | |
| 432 | spin_lock_irqsave(q->queue_lock, flags); |
| 433 | blk_start_queue(q); |
| 434 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 435 | kfree(dreq); |
| 436 | }; |
| 437 | |
| 438 | /** |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 439 | * i2o_block_end_request - Post-processing of completed commands |
| 440 | * @req: request which should be completed |
| 441 | * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error |
| 442 | * @nr_bytes: number of bytes to complete |
| 443 | * |
| 444 | * Mark the request as complete. The lock must not be held when entering. |
| 445 | * |
| 446 | */ |
| 447 | static void i2o_block_end_request(struct request *req, int uptodate, |
| 448 | int nr_bytes) |
| 449 | { |
| 450 | struct i2o_block_request *ireq = req->special; |
| 451 | struct i2o_block_device *dev = ireq->i2o_blk_dev; |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 452 | request_queue_t *q = req->q; |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 453 | unsigned long flags; |
| 454 | |
| 455 | if (end_that_request_chunk(req, uptodate, nr_bytes)) { |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 456 | int leftover = (req->hard_nr_sectors << KERNEL_SECTOR_SHIFT); |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 457 | |
| 458 | if (blk_pc_request(req)) |
| 459 | leftover = req->data_len; |
| 460 | |
| 461 | if (end_io_error(uptodate)) |
| 462 | end_that_request_chunk(req, 0, leftover); |
| 463 | } |
| 464 | |
| 465 | add_disk_randomness(req->rq_disk); |
| 466 | |
| 467 | spin_lock_irqsave(q->queue_lock, flags); |
| 468 | |
Tejun Heo | 8ffdc65 | 2006-01-06 09:49:03 +0100 | [diff] [blame^] | 469 | end_that_request_last(req, uptodate); |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 470 | |
| 471 | if (likely(dev)) { |
| 472 | dev->open_queue_depth--; |
| 473 | list_del(&ireq->queue); |
| 474 | } |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 475 | |
| 476 | blk_start_queue(q); |
| 477 | |
| 478 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 479 | |
| 480 | i2o_block_sglist_free(ireq); |
| 481 | i2o_block_request_free(ireq); |
| 482 | }; |
| 483 | |
| 484 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | * i2o_block_reply - Block OSM reply handler. |
| 486 | * @c: I2O controller from which the message arrives |
| 487 | * @m: message id of reply |
| 488 | * qmsg: the actuall I2O message reply |
| 489 | * |
| 490 | * This function gets all the message replies. |
| 491 | * |
| 492 | */ |
| 493 | static int i2o_block_reply(struct i2o_controller *c, u32 m, |
| 494 | struct i2o_message *msg) |
| 495 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | struct request *req; |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 497 | int uptodate = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); |
| 500 | if (unlikely(!req)) { |
| 501 | osm_err("NULL reply received!\n"); |
| 502 | return -1; |
| 503 | } |
| 504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | /* |
| 506 | * Lets see what is cooking. We stuffed the |
| 507 | * request in the context. |
| 508 | */ |
| 509 | |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 510 | if ((le32_to_cpu(msg->body[0]) >> 24) != 0) { |
| 511 | u32 status = le32_to_cpu(msg->body[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | /* |
| 513 | * Device not ready means two things. One is that the |
| 514 | * the thing went offline (but not a removal media) |
| 515 | * |
| 516 | * The second is that you have a SuperTrak 100 and the |
| 517 | * firmware got constipated. Unlike standard i2o card |
| 518 | * setups the supertrak returns an error rather than |
| 519 | * blocking for the timeout in these cases. |
| 520 | * |
| 521 | * Don't stick a supertrak100 into cache aggressive modes |
| 522 | */ |
| 523 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 524 | osm_err("TID %03x error status: 0x%02x, detailed status: " |
| 525 | "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff), |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 526 | status >> 24, status & 0xffff); |
| 527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | req->errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 530 | uptodate = 0; |
| 531 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 533 | i2o_block_end_request(req, uptodate, le32_to_cpu(msg->body[1])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
| 535 | return 1; |
| 536 | }; |
| 537 | |
| 538 | static void i2o_block_event(struct i2o_event *evt) |
| 539 | { |
Markus Lidel | 9e87545 | 2005-06-23 22:02:21 -0700 | [diff] [blame] | 540 | osm_debug("event received\n"); |
Markus Lidel | 223230e | 2005-06-13 22:58:00 -0700 | [diff] [blame] | 541 | kfree(evt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | }; |
| 543 | |
| 544 | /* |
| 545 | * SCSI-CAM for ioctl geometry mapping |
| 546 | * Duplicated with SCSI - this should be moved into somewhere common |
| 547 | * perhaps genhd ? |
| 548 | * |
| 549 | * LBA -> CHS mapping table taken from: |
| 550 | * |
| 551 | * "Incorporating the I2O Architecture into BIOS for Intel Architecture |
| 552 | * Platforms" |
| 553 | * |
| 554 | * This is an I2O document that is only available to I2O members, |
| 555 | * not developers. |
| 556 | * |
| 557 | * From my understanding, this is how all the I2O cards do this |
| 558 | * |
| 559 | * Disk Size | Sectors | Heads | Cylinders |
| 560 | * ---------------+---------+-------+------------------- |
| 561 | * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512) |
| 562 | * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512) |
| 563 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) |
| 564 | * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) |
| 565 | * |
| 566 | */ |
| 567 | #define BLOCK_SIZE_528M 1081344 |
| 568 | #define BLOCK_SIZE_1G 2097152 |
| 569 | #define BLOCK_SIZE_21G 4403200 |
| 570 | #define BLOCK_SIZE_42G 8806400 |
| 571 | #define BLOCK_SIZE_84G 17612800 |
| 572 | |
| 573 | static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls, |
| 574 | unsigned char *hds, unsigned char *secs) |
| 575 | { |
| 576 | unsigned long heads, sectors, cylinders; |
| 577 | |
| 578 | sectors = 63L; /* Maximize sectors per track */ |
| 579 | if (capacity <= BLOCK_SIZE_528M) |
| 580 | heads = 16; |
| 581 | else if (capacity <= BLOCK_SIZE_1G) |
| 582 | heads = 32; |
| 583 | else if (capacity <= BLOCK_SIZE_21G) |
| 584 | heads = 64; |
| 585 | else if (capacity <= BLOCK_SIZE_42G) |
| 586 | heads = 128; |
| 587 | else |
| 588 | heads = 255; |
| 589 | |
| 590 | cylinders = (unsigned long)capacity / (heads * sectors); |
| 591 | |
| 592 | *cyls = (unsigned short)cylinders; /* Stuff return values */ |
| 593 | *secs = (unsigned char)sectors; |
| 594 | *hds = (unsigned char)heads; |
| 595 | } |
| 596 | |
| 597 | /** |
| 598 | * i2o_block_open - Open the block device |
| 599 | * |
| 600 | * Power up the device, mount and lock the media. This function is called, |
| 601 | * if the block device is opened for access. |
| 602 | * |
| 603 | * Returns 0 on success or negative error code on failure. |
| 604 | */ |
| 605 | static int i2o_block_open(struct inode *inode, struct file *file) |
| 606 | { |
| 607 | struct i2o_block_device *dev = inode->i_bdev->bd_disk->private_data; |
| 608 | |
| 609 | if (!dev->i2o_dev) |
| 610 | return -ENODEV; |
| 611 | |
| 612 | if (dev->power > 0x1f) |
| 613 | i2o_block_device_power(dev, 0x02); |
| 614 | |
| 615 | i2o_block_device_mount(dev->i2o_dev, -1); |
| 616 | |
| 617 | i2o_block_device_lock(dev->i2o_dev, -1); |
| 618 | |
| 619 | osm_debug("Ready.\n"); |
| 620 | |
| 621 | return 0; |
| 622 | }; |
| 623 | |
| 624 | /** |
| 625 | * i2o_block_release - Release the I2O block device |
| 626 | * |
| 627 | * Unlock and unmount the media, and power down the device. Gets called if |
| 628 | * the block device is closed. |
| 629 | * |
| 630 | * Returns 0 on success or negative error code on failure. |
| 631 | */ |
| 632 | static int i2o_block_release(struct inode *inode, struct file *file) |
| 633 | { |
| 634 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 635 | struct i2o_block_device *dev = disk->private_data; |
| 636 | u8 operation; |
| 637 | |
| 638 | /* |
| 639 | * This is to deail with the case of an application |
| 640 | * opening a device and then the device dissapears while |
| 641 | * it's in use, and then the application tries to release |
| 642 | * it. ex: Unmounting a deleted RAID volume at reboot. |
| 643 | * If we send messages, it will just cause FAILs since |
| 644 | * the TID no longer exists. |
| 645 | */ |
| 646 | if (!dev->i2o_dev) |
| 647 | return 0; |
| 648 | |
| 649 | i2o_block_device_flush(dev->i2o_dev); |
| 650 | |
| 651 | i2o_block_device_unlock(dev->i2o_dev, -1); |
| 652 | |
| 653 | if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */ |
| 654 | operation = 0x21; |
| 655 | else |
| 656 | operation = 0x24; |
| 657 | |
| 658 | i2o_block_device_power(dev, operation); |
| 659 | |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * i2o_block_ioctl - Issue device specific ioctl calls. |
| 665 | * @cmd: ioctl command |
| 666 | * @arg: arg |
| 667 | * |
| 668 | * Handles ioctl request for the block device. |
| 669 | * |
| 670 | * Return 0 on success or negative error on failure. |
| 671 | */ |
| 672 | static int i2o_block_ioctl(struct inode *inode, struct file *file, |
| 673 | unsigned int cmd, unsigned long arg) |
| 674 | { |
| 675 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 676 | struct i2o_block_device *dev = disk->private_data; |
| 677 | void __user *argp = (void __user *)arg; |
| 678 | |
| 679 | /* Anyone capable of this syscall can do *real bad* things */ |
| 680 | |
| 681 | if (!capable(CAP_SYS_ADMIN)) |
| 682 | return -EPERM; |
| 683 | |
| 684 | switch (cmd) { |
| 685 | case HDIO_GETGEO: |
| 686 | { |
| 687 | struct hd_geometry g; |
| 688 | i2o_block_biosparam(get_capacity(disk), |
| 689 | &g.cylinders, &g.heads, &g.sectors); |
| 690 | g.start = get_start_sect(inode->i_bdev); |
| 691 | return copy_to_user(argp, &g, sizeof(g)) ? -EFAULT : 0; |
| 692 | } |
| 693 | |
| 694 | case BLKI2OGRSTRAT: |
| 695 | return put_user(dev->rcache, (int __user *)arg); |
| 696 | case BLKI2OGWSTRAT: |
| 697 | return put_user(dev->wcache, (int __user *)arg); |
| 698 | case BLKI2OSRSTRAT: |
| 699 | if (arg < 0 || arg > CACHE_SMARTFETCH) |
| 700 | return -EINVAL; |
| 701 | dev->rcache = arg; |
| 702 | break; |
| 703 | case BLKI2OSWSTRAT: |
| 704 | if (arg != 0 |
| 705 | && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) |
| 706 | return -EINVAL; |
| 707 | dev->wcache = arg; |
| 708 | break; |
| 709 | } |
| 710 | return -ENOTTY; |
| 711 | }; |
| 712 | |
| 713 | /** |
| 714 | * i2o_block_media_changed - Have we seen a media change? |
| 715 | * @disk: gendisk which should be verified |
| 716 | * |
| 717 | * Verifies if the media has changed. |
| 718 | * |
| 719 | * Returns 1 if the media was changed or 0 otherwise. |
| 720 | */ |
| 721 | static int i2o_block_media_changed(struct gendisk *disk) |
| 722 | { |
| 723 | struct i2o_block_device *p = disk->private_data; |
| 724 | |
| 725 | if (p->media_change_flag) { |
| 726 | p->media_change_flag = 0; |
| 727 | return 1; |
| 728 | } |
| 729 | return 0; |
| 730 | } |
| 731 | |
| 732 | /** |
| 733 | * i2o_block_transfer - Transfer a request to/from the I2O controller |
| 734 | * @req: the request which should be transfered |
| 735 | * |
| 736 | * This function converts the request into a I2O message. The necessary |
| 737 | * DMA buffers are allocated and after everything is setup post the message |
| 738 | * to the I2O controller. No cleanup is done by this function. It is done |
| 739 | * on the interrupt side when the reply arrives. |
| 740 | * |
| 741 | * Return 0 on success or negative error code on failure. |
| 742 | */ |
| 743 | static int i2o_block_transfer(struct request *req) |
| 744 | { |
| 745 | struct i2o_block_device *dev = req->rq_disk->private_data; |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 746 | struct i2o_controller *c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | int tid = dev->i2o_dev->lct_data.tid; |
| 748 | struct i2o_message __iomem *msg; |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 749 | u32 __iomem *mptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | struct i2o_block_request *ireq = req->special; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | u32 m; |
| 752 | u32 tcntxt; |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 753 | u32 sgl_offset = SGL_OFFSET_8; |
| 754 | u32 ctl_flags = 0x00000000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | int rc; |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 756 | u32 cmd; |
| 757 | |
| 758 | if (unlikely(!dev->i2o_dev)) { |
| 759 | osm_err("transfer to removed drive\n"); |
| 760 | rc = -ENODEV; |
| 761 | goto exit; |
| 762 | } |
| 763 | |
| 764 | c = dev->i2o_dev->iop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
| 766 | m = i2o_msg_get(c, &msg); |
| 767 | if (m == I2O_QUEUE_EMPTY) { |
| 768 | rc = -EBUSY; |
| 769 | goto exit; |
| 770 | } |
| 771 | |
| 772 | tcntxt = i2o_cntxt_list_add(c, req); |
| 773 | if (!tcntxt) { |
| 774 | rc = -ENOMEM; |
| 775 | goto nop_msg; |
| 776 | } |
| 777 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 778 | writel(i2o_block_driver.context, &msg->u.s.icntxt); |
| 779 | writel(tcntxt, &msg->u.s.tcntxt); |
| 780 | |
| 781 | mptr = &msg->body[0]; |
| 782 | |
| 783 | if (rq_data_dir(req) == READ) { |
| 784 | cmd = I2O_CMD_BLOCK_READ << 24; |
| 785 | |
| 786 | switch (dev->rcache) { |
| 787 | case CACHE_PREFETCH: |
| 788 | ctl_flags = 0x201F0008; |
| 789 | break; |
| 790 | |
| 791 | case CACHE_SMARTFETCH: |
| 792 | if (req->nr_sectors > 16) |
| 793 | ctl_flags = 0x201F0008; |
| 794 | else |
| 795 | ctl_flags = 0x001F0000; |
| 796 | break; |
| 797 | |
| 798 | default: |
| 799 | break; |
| 800 | } |
| 801 | } else { |
| 802 | cmd = I2O_CMD_BLOCK_WRITE << 24; |
| 803 | |
| 804 | switch (dev->wcache) { |
| 805 | case CACHE_WRITETHROUGH: |
| 806 | ctl_flags = 0x001F0008; |
| 807 | break; |
| 808 | case CACHE_WRITEBACK: |
| 809 | ctl_flags = 0x001F0010; |
| 810 | break; |
| 811 | case CACHE_SMARTBACK: |
| 812 | if (req->nr_sectors > 16) |
| 813 | ctl_flags = 0x001F0004; |
| 814 | else |
| 815 | ctl_flags = 0x001F0010; |
| 816 | break; |
| 817 | case CACHE_SMARTTHROUGH: |
| 818 | if (req->nr_sectors > 16) |
| 819 | ctl_flags = 0x001F0004; |
| 820 | else |
| 821 | ctl_flags = 0x001F0010; |
| 822 | default: |
| 823 | break; |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | #ifdef CONFIG_I2O_EXT_ADAPTEC |
| 828 | if (c->adaptec) { |
| 829 | u8 cmd[10]; |
| 830 | u32 scsi_flags; |
| 831 | u16 hwsec = queue_hardsect_size(req->q) >> KERNEL_SECTOR_SHIFT; |
| 832 | |
| 833 | memset(cmd, 0, 10); |
| 834 | |
| 835 | sgl_offset = SGL_OFFSET_12; |
| 836 | |
| 837 | writel(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid, |
| 838 | &msg->u.head[1]); |
| 839 | |
| 840 | writel(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC, mptr++); |
| 841 | writel(tid, mptr++); |
| 842 | |
| 843 | /* |
| 844 | * ENABLE_DISCONNECT |
| 845 | * SIMPLE_TAG |
| 846 | * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME |
| 847 | */ |
| 848 | if (rq_data_dir(req) == READ) { |
| 849 | cmd[0] = 0x28; |
| 850 | scsi_flags = 0x60a0000a; |
| 851 | } else { |
| 852 | cmd[0] = 0x2A; |
| 853 | scsi_flags = 0xa0a0000a; |
| 854 | } |
| 855 | |
| 856 | writel(scsi_flags, mptr++); |
| 857 | |
| 858 | *((u32 *) & cmd[2]) = cpu_to_be32(req->sector * hwsec); |
| 859 | *((u16 *) & cmd[7]) = cpu_to_be16(req->nr_sectors * hwsec); |
| 860 | |
| 861 | memcpy_toio(mptr, cmd, 10); |
| 862 | mptr += 4; |
| 863 | writel(req->nr_sectors << KERNEL_SECTOR_SHIFT, mptr++); |
| 864 | } else |
| 865 | #endif |
| 866 | { |
| 867 | writel(cmd | HOST_TID << 12 | tid, &msg->u.head[1]); |
| 868 | writel(ctl_flags, mptr++); |
| 869 | writel(req->nr_sectors << KERNEL_SECTOR_SHIFT, mptr++); |
| 870 | writel((u32) (req->sector << KERNEL_SECTOR_SHIFT), mptr++); |
| 871 | writel(req->sector >> (32 - KERNEL_SECTOR_SHIFT), mptr++); |
| 872 | } |
| 873 | |
| 874 | if (!i2o_block_sglist_alloc(c, ireq, &mptr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | rc = -ENOMEM; |
| 876 | goto context_remove; |
| 877 | } |
| 878 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 879 | writel(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | |
| 880 | sgl_offset, &msg->u.head[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
| 882 | list_add_tail(&ireq->queue, &dev->open_queue); |
| 883 | dev->open_queue_depth++; |
| 884 | |
| 885 | i2o_msg_post(c, m); |
| 886 | |
| 887 | return 0; |
| 888 | |
| 889 | context_remove: |
| 890 | i2o_cntxt_list_remove(c, req); |
| 891 | |
| 892 | nop_msg: |
| 893 | i2o_msg_nop(c, m); |
| 894 | |
| 895 | exit: |
| 896 | return rc; |
| 897 | }; |
| 898 | |
| 899 | /** |
| 900 | * i2o_block_request_fn - request queue handling function |
| 901 | * q: request queue from which the request could be fetched |
| 902 | * |
| 903 | * Takes the next request from the queue, transfers it and if no error |
| 904 | * occurs dequeue it from the queue. On arrival of the reply the message |
| 905 | * will be processed further. If an error occurs requeue the request. |
| 906 | */ |
| 907 | static void i2o_block_request_fn(struct request_queue *q) |
| 908 | { |
| 909 | struct request *req; |
| 910 | |
| 911 | while (!blk_queue_plugged(q)) { |
| 912 | req = elv_next_request(q); |
| 913 | if (!req) |
| 914 | break; |
| 915 | |
| 916 | if (blk_fs_request(req)) { |
| 917 | struct i2o_block_delayed_request *dreq; |
| 918 | struct i2o_block_request *ireq = req->special; |
| 919 | unsigned int queue_depth; |
| 920 | |
| 921 | queue_depth = ireq->i2o_blk_dev->open_queue_depth; |
| 922 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 923 | if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | if (!i2o_block_transfer(req)) { |
| 925 | blkdev_dequeue_request(req); |
| 926 | continue; |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 927 | } else |
| 928 | osm_info("transfer error\n"); |
| 929 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
| 931 | if (queue_depth) |
| 932 | break; |
| 933 | |
| 934 | /* stop the queue and retry later */ |
| 935 | dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC); |
| 936 | if (!dreq) |
| 937 | continue; |
| 938 | |
| 939 | dreq->queue = q; |
| 940 | INIT_WORK(&dreq->work, i2o_block_delayed_request_fn, |
| 941 | dreq); |
| 942 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | if (!queue_delayed_work(i2o_block_driver.event_queue, |
| 944 | &dreq->work, |
| 945 | I2O_BLOCK_RETRY_TIME)) |
| 946 | kfree(dreq); |
| 947 | else { |
| 948 | blk_stop_queue(q); |
| 949 | break; |
| 950 | } |
| 951 | } else |
| 952 | end_request(req, 0); |
| 953 | } |
| 954 | }; |
| 955 | |
| 956 | /* I2O Block device operations definition */ |
| 957 | static struct block_device_operations i2o_block_fops = { |
| 958 | .owner = THIS_MODULE, |
| 959 | .open = i2o_block_open, |
| 960 | .release = i2o_block_release, |
| 961 | .ioctl = i2o_block_ioctl, |
| 962 | .media_changed = i2o_block_media_changed |
| 963 | }; |
| 964 | |
| 965 | /** |
| 966 | * i2o_block_device_alloc - Allocate memory for a I2O Block device |
| 967 | * |
| 968 | * Allocate memory for the i2o_block_device struct, gendisk and request |
| 969 | * queue and initialize them as far as no additional information is needed. |
| 970 | * |
| 971 | * Returns a pointer to the allocated I2O Block device on succes or a |
| 972 | * negative error code on failure. |
| 973 | */ |
| 974 | static struct i2o_block_device *i2o_block_device_alloc(void) |
| 975 | { |
| 976 | struct i2o_block_device *dev; |
| 977 | struct gendisk *gd; |
| 978 | struct request_queue *queue; |
| 979 | int rc; |
| 980 | |
| 981 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); |
| 982 | if (!dev) { |
| 983 | osm_err("Insufficient memory to allocate I2O Block disk.\n"); |
| 984 | rc = -ENOMEM; |
| 985 | goto exit; |
| 986 | } |
| 987 | memset(dev, 0, sizeof(*dev)); |
| 988 | |
| 989 | INIT_LIST_HEAD(&dev->open_queue); |
| 990 | spin_lock_init(&dev->lock); |
| 991 | dev->rcache = CACHE_PREFETCH; |
| 992 | dev->wcache = CACHE_WRITEBACK; |
| 993 | |
| 994 | /* allocate a gendisk with 16 partitions */ |
| 995 | gd = alloc_disk(16); |
| 996 | if (!gd) { |
| 997 | osm_err("Insufficient memory to allocate gendisk.\n"); |
| 998 | rc = -ENOMEM; |
| 999 | goto cleanup_dev; |
| 1000 | } |
| 1001 | |
| 1002 | /* initialize the request queue */ |
| 1003 | queue = blk_init_queue(i2o_block_request_fn, &dev->lock); |
| 1004 | if (!queue) { |
| 1005 | osm_err("Insufficient memory to allocate request queue.\n"); |
| 1006 | rc = -ENOMEM; |
| 1007 | goto cleanup_queue; |
| 1008 | } |
| 1009 | |
| 1010 | blk_queue_prep_rq(queue, i2o_block_prep_req_fn); |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 1011 | blk_queue_issue_flush_fn(queue, i2o_block_issue_flush); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | |
| 1013 | gd->major = I2O_MAJOR; |
| 1014 | gd->queue = queue; |
| 1015 | gd->fops = &i2o_block_fops; |
| 1016 | gd->private_data = dev; |
| 1017 | |
| 1018 | dev->gd = gd; |
| 1019 | |
| 1020 | return dev; |
| 1021 | |
| 1022 | cleanup_queue: |
| 1023 | put_disk(gd); |
| 1024 | |
| 1025 | cleanup_dev: |
| 1026 | kfree(dev); |
| 1027 | |
| 1028 | exit: |
| 1029 | return ERR_PTR(rc); |
| 1030 | }; |
| 1031 | |
| 1032 | /** |
| 1033 | * i2o_block_probe - verify if dev is a I2O Block device and install it |
| 1034 | * @dev: device to verify if it is a I2O Block device |
| 1035 | * |
| 1036 | * We only verify if the user_tid of the device is 0xfff and then install |
| 1037 | * the device. Otherwise it is used by some other device (e. g. RAID). |
| 1038 | * |
| 1039 | * Returns 0 on success or negative error code on failure. |
| 1040 | */ |
| 1041 | static int i2o_block_probe(struct device *dev) |
| 1042 | { |
| 1043 | struct i2o_device *i2o_dev = to_i2o_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | struct i2o_controller *c = i2o_dev->iop; |
Markus Lidel | f33213e | 2005-06-23 22:02:23 -0700 | [diff] [blame] | 1045 | struct i2o_block_device *i2o_blk_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | struct gendisk *gd; |
| 1047 | struct request_queue *queue; |
| 1048 | static int unit = 0; |
| 1049 | int rc; |
| 1050 | u64 size; |
| 1051 | u32 blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | u32 flags, status; |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 1053 | u16 body_size = 4; |
| 1054 | unsigned short max_sectors; |
| 1055 | |
| 1056 | #ifdef CONFIG_I2O_EXT_ADAPTEC |
| 1057 | if (c->adaptec) |
| 1058 | body_size = 8; |
| 1059 | #endif |
| 1060 | |
| 1061 | if (c->limit_sectors) |
| 1062 | max_sectors = I2O_MAX_SECTORS_LIMITED; |
| 1063 | else |
| 1064 | max_sectors = I2O_MAX_SECTORS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
| 1066 | /* skip devices which are used by IOP */ |
| 1067 | if (i2o_dev->lct_data.user_tid != 0xfff) { |
| 1068 | osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid); |
| 1069 | return -ENODEV; |
| 1070 | } |
| 1071 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | if (i2o_device_claim(i2o_dev)) { |
| 1073 | osm_warn("Unable to claim device. Installation aborted\n"); |
| 1074 | rc = -EFAULT; |
| 1075 | goto exit; |
| 1076 | } |
| 1077 | |
| 1078 | i2o_blk_dev = i2o_block_device_alloc(); |
| 1079 | if (IS_ERR(i2o_blk_dev)) { |
| 1080 | osm_err("could not alloc a new I2O block device"); |
| 1081 | rc = PTR_ERR(i2o_blk_dev); |
| 1082 | goto claim_release; |
| 1083 | } |
| 1084 | |
| 1085 | i2o_blk_dev->i2o_dev = i2o_dev; |
| 1086 | dev_set_drvdata(dev, i2o_blk_dev); |
| 1087 | |
| 1088 | /* setup gendisk */ |
| 1089 | gd = i2o_blk_dev->gd; |
| 1090 | gd->first_minor = unit << 4; |
| 1091 | sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit); |
| 1092 | sprintf(gd->devfs_name, "i2o/hd%c", 'a' + unit); |
| 1093 | gd->driverfs_dev = &i2o_dev->device; |
| 1094 | |
| 1095 | /* setup request queue */ |
| 1096 | queue = gd->queue; |
| 1097 | queue->queuedata = i2o_blk_dev; |
| 1098 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 1099 | blk_queue_max_phys_segments(queue, I2O_MAX_PHYS_SEGMENTS); |
| 1100 | blk_queue_max_sectors(queue, max_sectors); |
| 1101 | blk_queue_max_hw_segments(queue, i2o_sg_tablesize(c, body_size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 1103 | osm_debug("max sectors = %d\n", queue->max_phys_segments); |
| 1104 | osm_debug("phys segments = %d\n", queue->max_sectors); |
| 1105 | osm_debug("max hw segments = %d\n", queue->max_hw_segments); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
| 1107 | /* |
| 1108 | * Ask for the current media data. If that isn't supported |
| 1109 | * then we ask for the device capacity data |
| 1110 | */ |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 1111 | if (i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) || |
| 1112 | i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) { |
| 1113 | blk_queue_hardsect_size(queue, blocksize); |
| 1114 | } else |
| 1115 | osm_warn("unable to get blocksize of %s\n", gd->disk_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 1117 | if (i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) || |
| 1118 | i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) { |
| 1119 | set_capacity(gd, size >> KERNEL_SECTOR_SHIFT); |
| 1120 | } else |
| 1121 | osm_warn("could not get size of %s\n", gd->disk_name); |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 1122 | |
| 1123 | if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &i2o_blk_dev->power, 2)) |
| 1124 | i2o_blk_dev->power = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | i2o_parm_field_get(i2o_dev, 0x0000, 5, &flags, 4); |
| 1126 | i2o_parm_field_get(i2o_dev, 0x0000, 6, &status, 4); |
| 1127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff); |
| 1129 | |
| 1130 | add_disk(gd); |
| 1131 | |
| 1132 | unit++; |
| 1133 | |
Markus Lidel | f88e119 | 2005-06-23 22:02:14 -0700 | [diff] [blame] | 1134 | osm_info("device added (TID: %03x): %s\n", i2o_dev->lct_data.tid, |
| 1135 | i2o_blk_dev->gd->disk_name); |
| 1136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Markus Lidel | f10378f | 2005-06-23 22:02:16 -0700 | [diff] [blame] | 1184 | i2o_blk_req_pool.pool = mempool_create(I2O_BLOCK_REQ_MEMPOOL_SIZE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |