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/slab.h> 55#include "i2o.h" 56#include <linux/mutex.h> 57 58#include <linux/mempool.h> 59 60#include <linux/genhd.h> 61#include <linux/blkdev.h> 62#include <linux/hdreg.h> 63 64#include <scsi/scsi.h> 65 66#include "i2o_block.h" 67 68#define OSM_NAME "block-osm" 69#define OSM_VERSION "1.325" 70#define OSM_DESCRIPTION "I2O Block Device OSM" 71 72static DEFINE_MUTEX(i2o_block_mutex); 73static struct i2o_driver i2o_block_driver; 74 75/* global Block OSM request mempool */ 76static struct i2o_block_mempool i2o_blk_req_pool; 77 78/* Block OSM class handling definition */ 79static struct i2o_class_id i2o_block_class_id[] = { 80 {I2O_CLASS_RANDOM_BLOCK_STORAGE}, 81 {I2O_CLASS_END} 82}; 83 84/** 85 * i2o_block_device_free - free the memory of the I2O Block device 86 * @dev: I2O Block device, which should be cleaned up 87 * 88 * Frees the request queue, gendisk and the i2o_block_device structure. 89 */ 90static void i2o_block_device_free(struct i2o_block_device *dev) 91{ 92 blk_cleanup_queue(dev->gd->queue); 93 94 put_disk(dev->gd); 95 96 kfree(dev); 97}; 98 99/** 100 * i2o_block_remove - remove the I2O Block device from the system again 101 * @dev: I2O Block device which should be removed 102 * 103 * Remove gendisk from system and free all allocated memory. 104 * 105 * Always returns 0. 106 */ 107static int i2o_block_remove(struct device *dev) 108{ 109 struct i2o_device *i2o_dev = to_i2o_device(dev); 110 struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev); 111 112 osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid, 113 i2o_blk_dev->gd->disk_name); 114 115 i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0); 116 117 del_gendisk(i2o_blk_dev->gd); 118 119 dev_set_drvdata(dev, NULL); 120 121 i2o_device_claim_release(i2o_dev); 122 123 i2o_block_device_free(i2o_blk_dev); 124 125 return 0; 126}; 127 128/** 129 * i2o_block_device flush - Flush all dirty data of I2O device dev 130 * @dev: I2O device which should be flushed 131 * 132 * Flushes all dirty data on device dev. 133 * 134 * Returns 0 on success or negative error code on failure. 135 */ 136static int i2o_block_device_flush(struct i2o_device *dev) 137{ 138 struct i2o_message *msg; 139 140 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); 141 if (IS_ERR(msg)) 142 return PTR_ERR(msg); 143 144 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); 145 msg->u.head[1] = 146 cpu_to_le32(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev-> 147 lct_data.tid); 148 msg->body[0] = cpu_to_le32(60 << 16); 149 osm_debug("Flushing...\n"); 150 151 return i2o_msg_post_wait(dev->iop, msg, 60); 152}; 153 154/** 155 * i2o_block_device_mount - Mount (load) the media of device dev 156 * @dev: I2O device which should receive the mount request 157 * @media_id: Media Identifier 158 * 159 * Load a media into drive. Identifier should be set to -1, because the 160 * spec does not support any other value. 161 * 162 * Returns 0 on success or negative error code on failure. 163 */ 164static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id) 165{ 166 struct i2o_message *msg; 167 168 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); 169 if (IS_ERR(msg)) 170 return PTR_ERR(msg); 171 172 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); 173 msg->u.head[1] = 174 cpu_to_le32(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev-> 175 lct_data.tid); 176 msg->body[0] = cpu_to_le32(-1); 177 msg->body[1] = cpu_to_le32(0x00000000); 178 osm_debug("Mounting...\n"); 179 180 return i2o_msg_post_wait(dev->iop, msg, 2); 181}; 182 183/** 184 * i2o_block_device_lock - Locks the media of device dev 185 * @dev: I2O device which should receive the lock request 186 * @media_id: Media Identifier 187 * 188 * Lock media of device dev to prevent removal. The media identifier 189 * should be set to -1, because the spec does not support any other value. 190 * 191 * Returns 0 on success or negative error code on failure. 192 */ 193static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) 194{ 195 struct i2o_message *msg; 196 197 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); 198 if (IS_ERR(msg)) 199 return PTR_ERR(msg); 200 201 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); 202 msg->u.head[1] = 203 cpu_to_le32(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev-> 204 lct_data.tid); 205 msg->body[0] = cpu_to_le32(-1); 206 osm_debug("Locking...\n"); 207 208 return i2o_msg_post_wait(dev->iop, msg, 2); 209}; 210 211/** 212 * i2o_block_device_unlock - Unlocks the media of device dev 213 * @dev: I2O device which should receive the unlocked request 214 * @media_id: Media Identifier 215 * 216 * Unlocks the media in device dev. The media identifier should be set to 217 * -1, because the spec does not support any other value. 218 * 219 * Returns 0 on success or negative error code on failure. 220 */ 221static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id) 222{ 223 struct i2o_message *msg; 224 225 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); 226 if (IS_ERR(msg)) 227 return PTR_ERR(msg); 228 229 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); 230 msg->u.head[1] = 231 cpu_to_le32(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev-> 232 lct_data.tid); 233 msg->body[0] = cpu_to_le32(media_id); 234 osm_debug("Unlocking...\n"); 235 236 return i2o_msg_post_wait(dev->iop, msg, 2); 237}; 238 239/** 240 * i2o_block_device_power - Power management for device dev 241 * @dev: I2O device which should receive the power management request 242 * @op: Operation to send 243 * 244 * Send a power management request to the device dev. 245 * 246 * Returns 0 on success or negative error code on failure. 247 */ 248static int i2o_block_device_power(struct i2o_block_device *dev, u8 op) 249{ 250 struct i2o_device *i2o_dev = dev->i2o_dev; 251 struct i2o_controller *c = i2o_dev->iop; 252 struct i2o_message *msg; 253 int rc; 254 255 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); 256 if (IS_ERR(msg)) 257 return PTR_ERR(msg); 258 259 msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0); 260 msg->u.head[1] = 261 cpu_to_le32(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev-> 262 lct_data.tid); 263 msg->body[0] = cpu_to_le32(op << 24); 264 osm_debug("Power...\n"); 265 266 rc = i2o_msg_post_wait(c, msg, 60); 267 if (!rc) 268 dev->power = op; 269 270 return rc; 271}; 272 273/** 274 * i2o_block_request_alloc - Allocate an I2O block request struct 275 * 276 * Allocates an I2O block request struct and initialize the list. 277 * 278 * Returns a i2o_block_request pointer on success or negative error code 279 * on failure. 280 */ 281static inline struct i2o_block_request *i2o_block_request_alloc(void) 282{ 283 struct i2o_block_request *ireq; 284 285 ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC); 286 if (!ireq) 287 return ERR_PTR(-ENOMEM); 288 289 INIT_LIST_HEAD(&ireq->queue); 290 sg_init_table(ireq->sg_table, I2O_MAX_PHYS_SEGMENTS); 291 292 return ireq; 293}; 294 295/** 296 * i2o_block_request_free - Frees a I2O block request 297 * @ireq: I2O block request which should be freed 298 * 299 * Frees the allocated memory (give it back to the request mempool). 300 */ 301static inline void i2o_block_request_free(struct i2o_block_request *ireq) 302{ 303 mempool_free(ireq, i2o_blk_req_pool.pool); 304}; 305 306/** 307 * i2o_block_sglist_alloc - Allocate the SG list and map it 308 * @c: I2O controller to which the request belongs 309 * @ireq: I2O block request 310 * @mptr: message body pointer 311 * 312 * Builds the SG list and map it to be accessible by the controller. 313 * 314 * Returns 0 on failure or 1 on success. 315 */ 316static inline int i2o_block_sglist_alloc(struct i2o_controller *c, 317 struct i2o_block_request *ireq, 318 u32 ** mptr) 319{ 320 int nents; 321 enum dma_data_direction direction; 322 323 ireq->dev = &c->pdev->dev; 324 nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table); 325 326 if (rq_data_dir(ireq->req) == READ) 327 direction = PCI_DMA_FROMDEVICE; 328 else 329 direction = PCI_DMA_TODEVICE; 330 331 ireq->sg_nents = nents; 332 333 return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr); 334}; 335 336/** 337 * i2o_block_sglist_free - Frees the SG list 338 * @ireq: I2O block request from which the SG should be freed 339 * 340 * Frees the SG list from the I2O block request. 341 */ 342static inline void i2o_block_sglist_free(struct i2o_block_request *ireq) 343{ 344 enum dma_data_direction direction; 345 346 if (rq_data_dir(ireq->req) == READ) 347 direction = PCI_DMA_FROMDEVICE; 348 else 349 direction = PCI_DMA_TODEVICE; 350 351 dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction); 352}; 353 354/** 355 * i2o_block_prep_req_fn - Allocates I2O block device specific struct 356 * @q: request queue for the request 357 * @req: the request to prepare 358 * 359 * Allocate the necessary i2o_block_request struct and connect it to 360 * the request. This is needed that we not lose the SG list later on. 361 * 362 * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure. 363 */ 364static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req) 365{ 366 struct i2o_block_device *i2o_blk_dev = q->queuedata; 367 struct i2o_block_request *ireq; 368 369 if (unlikely(!i2o_blk_dev)) { 370 osm_err("block device already removed\n"); 371 return BLKPREP_KILL; 372 } 373 374 /* connect the i2o_block_request to the request */ 375 if (!req->special) { 376 ireq = i2o_block_request_alloc(); 377 if (IS_ERR(ireq)) { 378 osm_debug("unable to allocate i2o_block_request!\n"); 379 return BLKPREP_DEFER; 380 } 381 382 ireq->i2o_blk_dev = i2o_blk_dev; 383 req->special = ireq; 384 ireq->req = req; 385 } 386 /* do not come back here */ 387 req->cmd_flags |= REQ_DONTPREP; 388 389 return BLKPREP_OK; 390}; 391 392/** 393 * i2o_block_delayed_request_fn - delayed request queue function 394 * @work: the delayed request with the queue to start 395 * 396 * If the request queue is stopped for a disk, and there is no open 397 * request, a new event is created, which calls this function to start 398 * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never 399 * be started again. 400 */ 401static void i2o_block_delayed_request_fn(struct work_struct *work) 402{ 403 struct i2o_block_delayed_request *dreq = 404 container_of(work, struct i2o_block_delayed_request, 405 work.work); 406 struct request_queue *q = dreq->queue; 407 unsigned long flags; 408 409 spin_lock_irqsave(q->queue_lock, flags); 410 blk_start_queue(q); 411 spin_unlock_irqrestore(q->queue_lock, flags); 412 kfree(dreq); 413}; 414 415/** 416 * i2o_block_end_request - Post-processing of completed commands 417 * @req: request which should be completed 418 * @error: 0 for success, < 0 for error 419 * @nr_bytes: number of bytes to complete 420 * 421 * Mark the request as complete. The lock must not be held when entering. 422 * 423 */ 424static void i2o_block_end_request(struct request *req, int error, 425 int nr_bytes) 426{ 427 struct i2o_block_request *ireq = req->special; 428 struct i2o_block_device *dev = ireq->i2o_blk_dev; 429 struct request_queue *q = req->q; 430 unsigned long flags; 431 432 if (blk_end_request(req, error, nr_bytes)) 433 if (error) 434 blk_end_request_all(req, -EIO); 435 436 spin_lock_irqsave(q->queue_lock, flags); 437 438 if (likely(dev)) { 439 dev->open_queue_depth--; 440 list_del(&ireq->queue); 441 } 442 443 blk_start_queue(q); 444 445 spin_unlock_irqrestore(q->queue_lock, flags); 446 447 i2o_block_sglist_free(ireq); 448 i2o_block_request_free(ireq); 449}; 450 451/** 452 * i2o_block_reply - Block OSM reply handler. 453 * @c: I2O controller from which the message arrives 454 * @m: message id of reply 455 * @msg: the actual I2O message reply 456 * 457 * This function gets all the message replies. 458 * 459 */ 460static int i2o_block_reply(struct i2o_controller *c, u32 m, 461 struct i2o_message *msg) 462{ 463 struct request *req; 464 int error = 0; 465 466 req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); 467 if (unlikely(!req)) { 468 osm_err("NULL reply received!\n"); 469 return -1; 470 } 471 472 /* 473 * Lets see what is cooking. We stuffed the 474 * request in the context. 475 */ 476 477 if ((le32_to_cpu(msg->body[0]) >> 24) != 0) { 478 u32 status = le32_to_cpu(msg->body[0]); 479 /* 480 * Device not ready means two things. One is that the 481 * the thing went offline (but not a removal media) 482 * 483 * The second is that you have a SuperTrak 100 and the 484 * firmware got constipated. Unlike standard i2o card 485 * setups the supertrak returns an error rather than 486 * blocking for the timeout in these cases. 487 * 488 * Don't stick a supertrak100 into cache aggressive modes 489 */ 490 491 osm_err("TID %03x error status: 0x%02x, detailed status: " 492 "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff), 493 status >> 24, status & 0xffff); 494 495 req->errors++; 496 497 error = -EIO; 498 } 499 500 i2o_block_end_request(req, error, le32_to_cpu(msg->body[1])); 501 502 return 1; 503}; 504 505static void i2o_block_event(struct work_struct *work) 506{ 507 struct i2o_event *evt = container_of(work, struct i2o_event, work); 508 osm_debug("event received\n"); 509 kfree(evt); 510}; 511 512/* 513 * SCSI-CAM for ioctl geometry mapping 514 * Duplicated with SCSI - this should be moved into somewhere common 515 * perhaps genhd ? 516 * 517 * LBA -> CHS mapping table taken from: 518 * 519 * "Incorporating the I2O Architecture into BIOS for Intel Architecture 520 * Platforms" 521 * 522 * This is an I2O document that is only available to I2O members, 523 * not developers. 524 * 525 * From my understanding, this is how all the I2O cards do this 526 * 527 * Disk Size | Sectors | Heads | Cylinders 528 * ---------------+---------+-------+------------------- 529 * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512) 530 * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512) 531 * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) 532 * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) 533 * 534 */ 535#define BLOCK_SIZE_528M 1081344 536#define BLOCK_SIZE_1G 2097152 537#define BLOCK_SIZE_21G 4403200 538#define BLOCK_SIZE_42G 8806400 539#define BLOCK_SIZE_84G 17612800 540 541static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls, 542 unsigned char *hds, unsigned char *secs) 543{ 544 unsigned long heads, sectors, cylinders; 545 546 sectors = 63L; /* Maximize sectors per track */ 547 if (capacity <= BLOCK_SIZE_528M) 548 heads = 16; 549 else if (capacity <= BLOCK_SIZE_1G) 550 heads = 32; 551 else if (capacity <= BLOCK_SIZE_21G) 552 heads = 64; 553 else if (capacity <= BLOCK_SIZE_42G) 554 heads = 128; 555 else 556 heads = 255; 557 558 cylinders = (unsigned long)capacity / (heads * sectors); 559 560 *cyls = (unsigned short)cylinders; /* Stuff return values */ 561 *secs = (unsigned char)sectors; 562 *hds = (unsigned char)heads; 563} 564 565/** 566 * i2o_block_open - Open the block device 567 * @bdev: block device being opened 568 * @mode: file open mode 569 * 570 * Power up the device, mount and lock the media. This function is called, 571 * if the block device is opened for access. 572 * 573 * Returns 0 on success or negative error code on failure. 574 */ 575static int i2o_block_open(struct block_device *bdev, fmode_t mode) 576{ 577 struct i2o_block_device *dev = bdev->bd_disk->private_data; 578 579 if (!dev->i2o_dev) 580 return -ENODEV; 581 582 mutex_lock(&i2o_block_mutex); 583 if (dev->power > 0x1f) 584 i2o_block_device_power(dev, 0x02); 585 586 i2o_block_device_mount(dev->i2o_dev, -1); 587 588 i2o_block_device_lock(dev->i2o_dev, -1); 589 590 osm_debug("Ready.\n"); 591 mutex_unlock(&i2o_block_mutex); 592 593 return 0; 594}; 595 596/** 597 * i2o_block_release - Release the I2O block device 598 * @disk: gendisk device being released 599 * @mode: file open mode 600 * 601 * Unlock and unmount the media, and power down the device. Gets called if 602 * the block device is closed. 603 */ 604static void i2o_block_release(struct gendisk *disk, fmode_t mode) 605{ 606 struct i2o_block_device *dev = disk->private_data; 607 u8 operation; 608 609 /* 610 * This is to deal with the case of an application 611 * opening a device and then the device disappears while 612 * it's in use, and then the application tries to release 613 * it. ex: Unmounting a deleted RAID volume at reboot. 614 * If we send messages, it will just cause FAILs since 615 * the TID no longer exists. 616 */ 617 if (!dev->i2o_dev) 618 return; 619 620 mutex_lock(&i2o_block_mutex); 621 i2o_block_device_flush(dev->i2o_dev); 622 623 i2o_block_device_unlock(dev->i2o_dev, -1); 624 625 if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */ 626 operation = 0x21; 627 else 628 operation = 0x24; 629 630 i2o_block_device_power(dev, operation); 631 mutex_unlock(&i2o_block_mutex); 632} 633 634static int i2o_block_getgeo(struct block_device *bdev, struct hd_geometry *geo) 635{ 636 i2o_block_biosparam(get_capacity(bdev->bd_disk), 637 &geo->cylinders, &geo->heads, &geo->sectors); 638 return 0; 639} 640 641/** 642 * i2o_block_ioctl - Issue device specific ioctl calls. 643 * @bdev: block device being opened 644 * @mode: file open mode 645 * @cmd: ioctl command 646 * @arg: arg 647 * 648 * Handles ioctl request for the block device. 649 * 650 * Return 0 on success or negative error on failure. 651 */ 652static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode, 653 unsigned int cmd, unsigned long arg) 654{ 655 struct gendisk *disk = bdev->bd_disk; 656 struct i2o_block_device *dev = disk->private_data; 657 int ret = -ENOTTY; 658 659 /* Anyone capable of this syscall can do *real bad* things */ 660 661 if (!capable(CAP_SYS_ADMIN)) 662 return -EPERM; 663 664 mutex_lock(&i2o_block_mutex); 665 switch (cmd) { 666 case BLKI2OGRSTRAT: 667 ret = put_user(dev->rcache, (int __user *)arg); 668 break; 669 case BLKI2OGWSTRAT: 670 ret = put_user(dev->wcache, (int __user *)arg); 671 break; 672 case BLKI2OSRSTRAT: 673 ret = -EINVAL; 674 if (arg < 0 || arg > CACHE_SMARTFETCH) 675 break; 676 dev->rcache = arg; 677 ret = 0; 678 break; 679 case BLKI2OSWSTRAT: 680 ret = -EINVAL; 681 if (arg != 0 682 && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) 683 break; 684 dev->wcache = arg; 685 ret = 0; 686 break; 687 } 688 mutex_unlock(&i2o_block_mutex); 689 690 return ret; 691}; 692 693/** 694 * i2o_block_check_events - Have we seen a media change? 695 * @disk: gendisk which should be verified 696 * @clearing: events being cleared 697 * 698 * Verifies if the media has changed. 699 * 700 * Returns 1 if the media was changed or 0 otherwise. 701 */ 702static unsigned int i2o_block_check_events(struct gendisk *disk, 703 unsigned int clearing) 704{ 705 struct i2o_block_device *p = disk->private_data; 706 707 if (p->media_change_flag) { 708 p->media_change_flag = 0; 709 return DISK_EVENT_MEDIA_CHANGE; 710 } 711 return 0; 712} 713 714/** 715 * i2o_block_transfer - Transfer a request to/from the I2O controller 716 * @req: the request which should be transferred 717 * 718 * This function converts the request into a I2O message. The necessary 719 * DMA buffers are allocated and after everything is setup post the message 720 * to the I2O controller. No cleanup is done by this function. It is done 721 * on the interrupt side when the reply arrives. 722 * 723 * Return 0 on success or negative error code on failure. 724 */ 725static int i2o_block_transfer(struct request *req) 726{ 727 struct i2o_block_device *dev = req->rq_disk->private_data; 728 struct i2o_controller *c; 729 u32 tid; 730 struct i2o_message *msg; 731 u32 *mptr; 732 struct i2o_block_request *ireq = req->special; 733 u32 tcntxt; 734 u32 sgl_offset = SGL_OFFSET_8; 735 u32 ctl_flags = 0x00000000; 736 int rc; 737 u32 cmd; 738 739 if (unlikely(!dev->i2o_dev)) { 740 osm_err("transfer to removed drive\n"); 741 rc = -ENODEV; 742 goto exit; 743 } 744 745 tid = dev->i2o_dev->lct_data.tid; 746 c = dev->i2o_dev->iop; 747 748 msg = i2o_msg_get(c); 749 if (IS_ERR(msg)) { 750 rc = PTR_ERR(msg); 751 goto exit; 752 } 753 754 tcntxt = i2o_cntxt_list_add(c, req); 755 if (!tcntxt) { 756 rc = -ENOMEM; 757 goto nop_msg; 758 } 759 760 msg->u.s.icntxt = cpu_to_le32(i2o_block_driver.context); 761 msg->u.s.tcntxt = cpu_to_le32(tcntxt); 762 763 mptr = &msg->body[0]; 764 765 if (rq_data_dir(req) == READ) { 766 cmd = I2O_CMD_BLOCK_READ << 24; 767 768 switch (dev->rcache) { 769 case CACHE_PREFETCH: 770 ctl_flags = 0x201F0008; 771 break; 772 773 case CACHE_SMARTFETCH: 774 if (blk_rq_sectors(req) > 16) 775 ctl_flags = 0x201F0008; 776 else 777 ctl_flags = 0x001F0000; 778 break; 779 780 default: 781 break; 782 } 783 } else { 784 cmd = I2O_CMD_BLOCK_WRITE << 24; 785 786 switch (dev->wcache) { 787 case CACHE_WRITETHROUGH: 788 ctl_flags = 0x001F0008; 789 break; 790 case CACHE_WRITEBACK: 791 ctl_flags = 0x001F0010; 792 break; 793 case CACHE_SMARTBACK: 794 if (blk_rq_sectors(req) > 16) 795 ctl_flags = 0x001F0004; 796 else 797 ctl_flags = 0x001F0010; 798 break; 799 case CACHE_SMARTTHROUGH: 800 if (blk_rq_sectors(req) > 16) 801 ctl_flags = 0x001F0004; 802 else 803 ctl_flags = 0x001F0010; 804 default: 805 break; 806 } 807 } 808 809#ifdef CONFIG_I2O_EXT_ADAPTEC 810 if (c->adaptec) { 811 u8 cmd[10]; 812 u32 scsi_flags; 813 u16 hwsec; 814 815 hwsec = queue_logical_block_size(req->q) >> KERNEL_SECTOR_SHIFT; 816 memset(cmd, 0, 10); 817 818 sgl_offset = SGL_OFFSET_12; 819 820 msg->u.head[1] = 821 cpu_to_le32(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid); 822 823 *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC); 824 *mptr++ = cpu_to_le32(tid); 825 826 /* 827 * ENABLE_DISCONNECT 828 * SIMPLE_TAG 829 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME 830 */ 831 if (rq_data_dir(req) == READ) { 832 cmd[0] = READ_10; 833 scsi_flags = 0x60a0000a; 834 } else { 835 cmd[0] = WRITE_10; 836 scsi_flags = 0xa0a0000a; 837 } 838 839 *mptr++ = cpu_to_le32(scsi_flags); 840 841 *((u32 *) & cmd[2]) = cpu_to_be32(blk_rq_pos(req) * hwsec); 842 *((u16 *) & cmd[7]) = cpu_to_be16(blk_rq_sectors(req) * hwsec); 843 844 memcpy(mptr, cmd, 10); 845 mptr += 4; 846 *mptr++ = cpu_to_le32(blk_rq_bytes(req)); 847 } else 848#endif 849 { 850 msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); 851 *mptr++ = cpu_to_le32(ctl_flags); 852 *mptr++ = cpu_to_le32(blk_rq_bytes(req)); 853 *mptr++ = 854 cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT)); 855 *mptr++ = 856 cpu_to_le32(blk_rq_pos(req) >> (32 - KERNEL_SECTOR_SHIFT)); 857 } 858 859 if (!i2o_block_sglist_alloc(c, ireq, &mptr)) { 860 rc = -ENOMEM; 861 goto context_remove; 862 } 863 864 msg->u.head[0] = 865 cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset); 866 867 list_add_tail(&ireq->queue, &dev->open_queue); 868 dev->open_queue_depth++; 869 870 i2o_msg_post(c, msg); 871 872 return 0; 873 874context_remove: 875 i2o_cntxt_list_remove(c, req); 876 877nop_msg: 878 i2o_msg_nop(c, msg); 879 880exit: 881 return rc; 882}; 883 884/** 885 * i2o_block_request_fn - request queue handling function 886 * @q: request queue from which the request could be fetched 887 * 888 * Takes the next request from the queue, transfers it and if no error 889 * occurs dequeue it from the queue. On arrival of the reply the message 890 * will be processed further. If an error occurs requeue the request. 891 */ 892static void i2o_block_request_fn(struct request_queue *q) 893{ 894 struct request *req; 895 896 while ((req = blk_peek_request(q)) != NULL) { 897 if (req->cmd_type == REQ_TYPE_FS) { 898 struct i2o_block_delayed_request *dreq; 899 struct i2o_block_request *ireq = req->special; 900 unsigned int queue_depth; 901 902 queue_depth = ireq->i2o_blk_dev->open_queue_depth; 903 904 if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) { 905 if (!i2o_block_transfer(req)) { 906 blk_start_request(req); 907 continue; 908 } else 909 osm_info("transfer error\n"); 910 } 911 912 if (queue_depth) 913 break; 914 915 /* stop the queue and retry later */ 916 dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC); 917 if (!dreq) 918 continue; 919 920 dreq->queue = q; 921 INIT_DELAYED_WORK(&dreq->work, 922 i2o_block_delayed_request_fn); 923 924 if (!queue_delayed_work(i2o_block_driver.event_queue, 925 &dreq->work, 926 I2O_BLOCK_RETRY_TIME)) 927 kfree(dreq); 928 else { 929 blk_stop_queue(q); 930 break; 931 } 932 } else { 933 blk_start_request(req); 934 __blk_end_request_all(req, -EIO); 935 } 936 } 937}; 938 939/* I2O Block device operations definition */ 940static const struct block_device_operations i2o_block_fops = { 941 .owner = THIS_MODULE, 942 .open = i2o_block_open, 943 .release = i2o_block_release, 944 .ioctl = i2o_block_ioctl, 945 .compat_ioctl = i2o_block_ioctl, 946 .getgeo = i2o_block_getgeo, 947 .check_events = i2o_block_check_events, 948}; 949 950/** 951 * i2o_block_device_alloc - Allocate memory for a I2O Block device 952 * 953 * Allocate memory for the i2o_block_device struct, gendisk and request 954 * queue and initialize them as far as no additional information is needed. 955 * 956 * Returns a pointer to the allocated I2O Block device on success or a 957 * negative error code on failure. 958 */ 959static struct i2o_block_device *i2o_block_device_alloc(void) 960{ 961 struct i2o_block_device *dev; 962 struct gendisk *gd; 963 struct request_queue *queue; 964 int rc; 965 966 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 967 if (!dev) { 968 osm_err("Insufficient memory to allocate I2O Block disk.\n"); 969 rc = -ENOMEM; 970 goto exit; 971 } 972 973 INIT_LIST_HEAD(&dev->open_queue); 974 spin_lock_init(&dev->lock); 975 dev->rcache = CACHE_PREFETCH; 976 dev->wcache = CACHE_WRITEBACK; 977 978 /* allocate a gendisk with 16 partitions */ 979 gd = alloc_disk(16); 980 if (!gd) { 981 osm_err("Insufficient memory to allocate gendisk.\n"); 982 rc = -ENOMEM; 983 goto cleanup_dev; 984 } 985 986 /* initialize the request queue */ 987 queue = blk_init_queue(i2o_block_request_fn, &dev->lock); 988 if (!queue) { 989 osm_err("Insufficient memory to allocate request queue.\n"); 990 rc = -ENOMEM; 991 goto cleanup_queue; 992 } 993 994 blk_queue_prep_rq(queue, i2o_block_prep_req_fn); 995 996 gd->major = I2O_MAJOR; 997 gd->queue = queue; 998 gd->fops = &i2o_block_fops; 999 gd->private_data = dev; 1000 1001 dev->gd = gd; 1002 1003 return dev; 1004 1005cleanup_queue: 1006 put_disk(gd); 1007 1008cleanup_dev: 1009 kfree(dev); 1010 1011exit: 1012 return ERR_PTR(rc); 1013}; 1014 1015/** 1016 * i2o_block_probe - verify if dev is a I2O Block device and install it 1017 * @dev: device to verify if it is a I2O Block device 1018 * 1019 * We only verify if the user_tid of the device is 0xfff and then install 1020 * the device. Otherwise it is used by some other device (e. g. RAID). 1021 * 1022 * Returns 0 on success or negative error code on failure. 1023 */ 1024static int i2o_block_probe(struct device *dev) 1025{ 1026 struct i2o_device *i2o_dev = to_i2o_device(dev); 1027 struct i2o_controller *c = i2o_dev->iop; 1028 struct i2o_block_device *i2o_blk_dev; 1029 struct gendisk *gd; 1030 struct request_queue *queue; 1031 static int unit; 1032 int rc; 1033 u64 size; 1034 u32 blocksize; 1035 u16 body_size = 4; 1036 u16 power; 1037 unsigned short max_sectors; 1038 1039#ifdef CONFIG_I2O_EXT_ADAPTEC 1040 if (c->adaptec) 1041 body_size = 8; 1042#endif 1043 1044 if (c->limit_sectors) 1045 max_sectors = I2O_MAX_SECTORS_LIMITED; 1046 else 1047 max_sectors = I2O_MAX_SECTORS; 1048 1049 /* skip devices which are used by IOP */ 1050 if (i2o_dev->lct_data.user_tid != 0xfff) { 1051 osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid); 1052 return -ENODEV; 1053 } 1054 1055 if (i2o_device_claim(i2o_dev)) { 1056 osm_warn("Unable to claim device. Installation aborted\n"); 1057 rc = -EFAULT; 1058 goto exit; 1059 } 1060 1061 i2o_blk_dev = i2o_block_device_alloc(); 1062 if (IS_ERR(i2o_blk_dev)) { 1063 osm_err("could not alloc a new I2O block device"); 1064 rc = PTR_ERR(i2o_blk_dev); 1065 goto claim_release; 1066 } 1067 1068 i2o_blk_dev->i2o_dev = i2o_dev; 1069 dev_set_drvdata(dev, i2o_blk_dev); 1070 1071 /* setup gendisk */ 1072 gd = i2o_blk_dev->gd; 1073 gd->first_minor = unit << 4; 1074 sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit); 1075 gd->driverfs_dev = &i2o_dev->device; 1076 1077 /* setup request queue */ 1078 queue = gd->queue; 1079 queue->queuedata = i2o_blk_dev; 1080 1081 blk_queue_max_hw_sectors(queue, max_sectors); 1082 blk_queue_max_segments(queue, i2o_sg_tablesize(c, body_size)); 1083 1084 osm_debug("max sectors = %d\n", queue->max_sectors); 1085 osm_debug("phys segments = %d\n", queue->max_phys_segments); 1086 osm_debug("max hw segments = %d\n", queue->max_hw_segments); 1087 1088 /* 1089 * Ask for the current media data. If that isn't supported 1090 * then we ask for the device capacity data 1091 */ 1092 if (!i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) || 1093 !i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) { 1094 blk_queue_logical_block_size(queue, le32_to_cpu(blocksize)); 1095 } else 1096 osm_warn("unable to get blocksize of %s\n", gd->disk_name); 1097 1098 if (!i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) || 1099 !i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) { 1100 set_capacity(gd, le64_to_cpu(size) >> KERNEL_SECTOR_SHIFT); 1101 } else 1102 osm_warn("could not get size of %s\n", gd->disk_name); 1103 1104 if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2)) 1105 i2o_blk_dev->power = power; 1106 1107 i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff); 1108 1109 add_disk(gd); 1110 1111 unit++; 1112 1113 osm_info("device added (TID: %03x): %s\n", i2o_dev->lct_data.tid, 1114 i2o_blk_dev->gd->disk_name); 1115 1116 return 0; 1117 1118claim_release: 1119 i2o_device_claim_release(i2o_dev); 1120 1121exit: 1122 return rc; 1123}; 1124 1125/* Block OSM driver struct */ 1126static struct i2o_driver i2o_block_driver = { 1127 .name = OSM_NAME, 1128 .event = i2o_block_event, 1129 .reply = i2o_block_reply, 1130 .classes = i2o_block_class_id, 1131 .driver = { 1132 .probe = i2o_block_probe, 1133 .remove = i2o_block_remove, 1134 }, 1135}; 1136 1137/** 1138 * i2o_block_init - Block OSM initialization function 1139 * 1140 * Allocate the slab and mempool for request structs, registers i2o_block 1141 * block device and finally register the Block OSM in the I2O core. 1142 * 1143 * Returns 0 on success or negative error code on failure. 1144 */ 1145static int __init i2o_block_init(void) 1146{ 1147 int rc; 1148 int size; 1149 1150 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); 1151 1152 /* Allocate request mempool and slab */ 1153 size = sizeof(struct i2o_block_request); 1154 i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0, 1155 SLAB_HWCACHE_ALIGN, NULL); 1156 if (!i2o_blk_req_pool.slab) { 1157 osm_err("can't init request slab\n"); 1158 rc = -ENOMEM; 1159 goto exit; 1160 } 1161 1162 i2o_blk_req_pool.pool = 1163 mempool_create_slab_pool(I2O_BLOCK_REQ_MEMPOOL_SIZE, 1164 i2o_blk_req_pool.slab); 1165 if (!i2o_blk_req_pool.pool) { 1166 osm_err("can't init request mempool\n"); 1167 rc = -ENOMEM; 1168 goto free_slab; 1169 } 1170 1171 /* Register the block device interfaces */ 1172 rc = register_blkdev(I2O_MAJOR, "i2o_block"); 1173 if (rc) { 1174 osm_err("unable to register block device\n"); 1175 goto free_mempool; 1176 } 1177#ifdef MODULE 1178 osm_info("registered device at major %d\n", I2O_MAJOR); 1179#endif 1180 1181 /* Register Block OSM into I2O core */ 1182 rc = i2o_driver_register(&i2o_block_driver); 1183 if (rc) { 1184 osm_err("Could not register Block driver\n"); 1185 goto unregister_blkdev; 1186 } 1187 1188 return 0; 1189 1190unregister_blkdev: 1191 unregister_blkdev(I2O_MAJOR, "i2o_block"); 1192 1193free_mempool: 1194 mempool_destroy(i2o_blk_req_pool.pool); 1195 1196free_slab: 1197 kmem_cache_destroy(i2o_blk_req_pool.slab); 1198 1199exit: 1200 return rc; 1201}; 1202 1203/** 1204 * i2o_block_exit - Block OSM exit function 1205 * 1206 * Unregisters Block OSM from I2O core, unregisters i2o_block block device 1207 * and frees the mempool and slab. 1208 */ 1209static void __exit i2o_block_exit(void) 1210{ 1211 /* Unregister I2O Block OSM from I2O core */ 1212 i2o_driver_unregister(&i2o_block_driver); 1213 1214 /* Unregister block device */ 1215 unregister_blkdev(I2O_MAJOR, "i2o_block"); 1216 1217 /* Free request mempool and slab */ 1218 mempool_destroy(i2o_blk_req_pool.pool); 1219 kmem_cache_destroy(i2o_blk_req_pool.slab); 1220}; 1221 1222MODULE_AUTHOR("Red Hat"); 1223MODULE_LICENSE("GPL"); 1224MODULE_DESCRIPTION(OSM_DESCRIPTION); 1225MODULE_VERSION(OSM_VERSION); 1226 1227module_init(i2o_block_init); 1228module_exit(i2o_block_exit); 1229