1/* 2 * This program is free software; you can redistribute it and/or modify it 3 * under the terms of the GNU General Public License as published by the 4 * Free Software Foundation; either version 2, or (at your option) any 5 * later version. 6 * 7 * This program is distributed in the hope that it will be useful, but 8 * WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 10 * General Public License for more details. 11 * 12 * For the avoidance of doubt the "preferred form" of this code is one which 13 * is in an open non patent encumbered format. Where cryptographic key signing 14 * forms part of the process of creating an executable the information 15 * including keys needed to generate an equivalently functional executable 16 * are deemed to be part of the source code. 17 * 18 * Complications for I2O scsi 19 * 20 * o Each (bus,lun) is a logical device in I2O. We keep a map 21 * table. We spoof failed selection for unmapped units 22 * o Request sense buffers can come back for free. 23 * o Scatter gather is a bit dynamic. We have to investigate at 24 * setup time. 25 * o Some of our resources are dynamically shared. The i2o core 26 * needs a message reservation protocol to avoid swap v net 27 * deadlocking. We need to back off queue requests. 28 * 29 * In general the firmware wants to help. Where its help isn't performance 30 * useful we just ignore the aid. Its not worth the code in truth. 31 * 32 * Fixes/additions: 33 * Steve Ralston: 34 * Scatter gather now works 35 * Markus Lidel <Markus.Lidel@shadowconnect.com>: 36 * Minor fixes for 2.6. 37 * 38 * To Do: 39 * 64bit cleanups 40 * Fix the resource management problems. 41 */ 42 43#include <linux/module.h> 44#include <linux/kernel.h> 45#include <linux/types.h> 46#include <linux/string.h> 47#include <linux/ioport.h> 48#include <linux/jiffies.h> 49#include <linux/interrupt.h> 50#include <linux/timer.h> 51#include <linux/delay.h> 52#include <linux/proc_fs.h> 53#include <linux/prefetch.h> 54#include <linux/pci.h> 55#include <linux/blkdev.h> 56#include <linux/i2o.h> 57#include <linux/scatterlist.h> 58 59#include <asm/dma.h> 60#include <asm/io.h> 61#include <linux/atomic.h> 62 63#include <scsi/scsi.h> 64#include <scsi/scsi_host.h> 65#include <scsi/scsi_device.h> 66#include <scsi/scsi_cmnd.h> 67#include <scsi/sg.h> 68 69#define OSM_NAME "scsi-osm" 70#define OSM_VERSION "1.316" 71#define OSM_DESCRIPTION "I2O SCSI Peripheral OSM" 72 73static struct i2o_driver i2o_scsi_driver; 74 75static unsigned int i2o_scsi_max_id = 16; 76static unsigned int i2o_scsi_max_lun = 255; 77 78struct i2o_scsi_host { 79 struct Scsi_Host *scsi_host; /* pointer to the SCSI host */ 80 struct i2o_controller *iop; /* pointer to the I2O controller */ 81 unsigned int lun; /* lun's used for block devices */ 82 struct i2o_device *channel[0]; /* channel->i2o_dev mapping table */ 83}; 84 85static struct scsi_host_template i2o_scsi_host_template; 86 87#define I2O_SCSI_CAN_QUEUE 4 88 89/* SCSI OSM class handling definition */ 90static struct i2o_class_id i2o_scsi_class_id[] = { 91 {I2O_CLASS_SCSI_PERIPHERAL}, 92 {I2O_CLASS_END} 93}; 94 95static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c) 96{ 97 struct i2o_scsi_host *i2o_shost; 98 struct i2o_device *i2o_dev; 99 struct Scsi_Host *scsi_host; 100 int max_channel = 0; 101 u8 type; 102 int i; 103 size_t size; 104 u16 body_size = 6; 105 106#ifdef CONFIG_I2O_EXT_ADAPTEC 107 if (c->adaptec) 108 body_size = 8; 109#endif 110 111 list_for_each_entry(i2o_dev, &c->devices, list) 112 if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) { 113 if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) 114 && (type == 0x01)) /* SCSI bus */ 115 max_channel++; 116 } 117 118 if (!max_channel) { 119 osm_warn("no channels found on %s\n", c->name); 120 return ERR_PTR(-EFAULT); 121 } 122 123 size = max_channel * sizeof(struct i2o_device *) 124 + sizeof(struct i2o_scsi_host); 125 126 scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size); 127 if (!scsi_host) { 128 osm_warn("Could not allocate SCSI host\n"); 129 return ERR_PTR(-ENOMEM); 130 } 131 132 scsi_host->max_channel = max_channel - 1; 133 scsi_host->max_id = i2o_scsi_max_id; 134 scsi_host->max_lun = i2o_scsi_max_lun; 135 scsi_host->this_id = c->unit; 136 scsi_host->sg_tablesize = i2o_sg_tablesize(c, body_size); 137 138 i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata; 139 i2o_shost->scsi_host = scsi_host; 140 i2o_shost->iop = c; 141 i2o_shost->lun = 1; 142 143 i = 0; 144 list_for_each_entry(i2o_dev, &c->devices, list) 145 if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) { 146 if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) 147 && (type == 0x01)) /* only SCSI bus */ 148 i2o_shost->channel[i++] = i2o_dev; 149 150 if (i >= max_channel) 151 break; 152 } 153 154 return i2o_shost; 155}; 156 157/** 158 * i2o_scsi_get_host - Get an I2O SCSI host 159 * @c: I2O controller to for which to get the SCSI host 160 * 161 * If the I2O controller already exists as SCSI host, the SCSI host 162 * is returned, otherwise the I2O controller is added to the SCSI 163 * core. 164 * 165 * Returns pointer to the I2O SCSI host on success or NULL on failure. 166 */ 167static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c) 168{ 169 return c->driver_data[i2o_scsi_driver.context]; 170}; 171 172/** 173 * i2o_scsi_remove - Remove I2O device from SCSI core 174 * @dev: device which should be removed 175 * 176 * Removes the I2O device from the SCSI core again. 177 * 178 * Returns 0 on success. 179 */ 180static int i2o_scsi_remove(struct device *dev) 181{ 182 struct i2o_device *i2o_dev = to_i2o_device(dev); 183 struct i2o_controller *c = i2o_dev->iop; 184 struct i2o_scsi_host *i2o_shost; 185 struct scsi_device *scsi_dev; 186 187 osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid); 188 189 i2o_shost = i2o_scsi_get_host(c); 190 191 shost_for_each_device(scsi_dev, i2o_shost->scsi_host) 192 if (scsi_dev->hostdata == i2o_dev) { 193 sysfs_remove_link(&i2o_dev->device.kobj, "scsi"); 194 scsi_remove_device(scsi_dev); 195 scsi_device_put(scsi_dev); 196 break; 197 } 198 199 return 0; 200}; 201 202/** 203 * i2o_scsi_probe - verify if dev is a I2O SCSI device and install it 204 * @dev: device to verify if it is a I2O SCSI device 205 * 206 * Retrieve channel, id and lun for I2O device. If everything goes well 207 * register the I2O device as SCSI device on the I2O SCSI controller. 208 * 209 * Returns 0 on success or negative error code on failure. 210 */ 211static int i2o_scsi_probe(struct device *dev) 212{ 213 struct i2o_device *i2o_dev = to_i2o_device(dev); 214 struct i2o_controller *c = i2o_dev->iop; 215 struct i2o_scsi_host *i2o_shost; 216 struct Scsi_Host *scsi_host; 217 struct i2o_device *parent; 218 struct scsi_device *scsi_dev; 219 u32 id = -1; 220 u64 lun = -1; 221 int channel = -1; 222 int i, rc; 223 224 i2o_shost = i2o_scsi_get_host(c); 225 if (!i2o_shost) 226 return -EFAULT; 227 228 scsi_host = i2o_shost->scsi_host; 229 230 switch (i2o_dev->lct_data.class_id) { 231 case I2O_CLASS_RANDOM_BLOCK_STORAGE: 232 case I2O_CLASS_EXECUTIVE: 233#ifdef CONFIG_I2O_EXT_ADAPTEC 234 if (c->adaptec) { 235 u8 type; 236 struct i2o_device *d = i2o_shost->channel[0]; 237 238 if (!i2o_parm_field_get(d, 0x0000, 0, &type, 1) 239 && (type == 0x01)) /* SCSI bus */ 240 if (!i2o_parm_field_get(d, 0x0200, 4, &id, 4)) { 241 channel = 0; 242 if (i2o_dev->lct_data.class_id == 243 I2O_CLASS_RANDOM_BLOCK_STORAGE) 244 lun = 245 cpu_to_le64(i2o_shost-> 246 lun++); 247 else 248 lun = 0; 249 } 250 } 251#endif 252 break; 253 254 case I2O_CLASS_SCSI_PERIPHERAL: 255 if (i2o_parm_field_get(i2o_dev, 0x0000, 3, &id, 4)) 256 return -EFAULT; 257 258 if (i2o_parm_field_get(i2o_dev, 0x0000, 4, &lun, 8)) 259 return -EFAULT; 260 261 parent = i2o_iop_find_device(c, i2o_dev->lct_data.parent_tid); 262 if (!parent) { 263 osm_warn("can not find parent of device %03x\n", 264 i2o_dev->lct_data.tid); 265 return -EFAULT; 266 } 267 268 for (i = 0; i <= i2o_shost->scsi_host->max_channel; i++) 269 if (i2o_shost->channel[i] == parent) 270 channel = i; 271 break; 272 273 default: 274 return -EFAULT; 275 } 276 277 if (channel == -1) { 278 osm_warn("can not find channel of device %03x\n", 279 i2o_dev->lct_data.tid); 280 return -EFAULT; 281 } 282 283 if (le32_to_cpu(id) >= scsi_host->max_id) { 284 osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)", 285 le32_to_cpu(id), scsi_host->max_id); 286 return -EFAULT; 287 } 288 289 if (le64_to_cpu(lun) >= scsi_host->max_lun) { 290 osm_warn("SCSI device lun (%lu) >= max_lun of I2O host (%d)", 291 (long unsigned int)le64_to_cpu(lun), 292 scsi_host->max_lun); 293 return -EFAULT; 294 } 295 296 scsi_dev = 297 __scsi_add_device(i2o_shost->scsi_host, channel, le32_to_cpu(id), 298 le64_to_cpu(lun), i2o_dev); 299 300 if (IS_ERR(scsi_dev)) { 301 osm_warn("can not add SCSI device %03x\n", 302 i2o_dev->lct_data.tid); 303 return PTR_ERR(scsi_dev); 304 } 305 306 rc = sysfs_create_link(&i2o_dev->device.kobj, 307 &scsi_dev->sdev_gendev.kobj, "scsi"); 308 if (rc) 309 goto err; 310 311 osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %ld\n", 312 i2o_dev->lct_data.tid, channel, le32_to_cpu(id), 313 (long unsigned int)le64_to_cpu(lun)); 314 315 return 0; 316 317err: 318 scsi_remove_device(scsi_dev); 319 return rc; 320}; 321 322static const char *i2o_scsi_info(struct Scsi_Host *SChost) 323{ 324 struct i2o_scsi_host *hostdata; 325 hostdata = (struct i2o_scsi_host *)SChost->hostdata; 326 return hostdata->iop->name; 327} 328 329/** 330 * i2o_scsi_reply - SCSI OSM message reply handler 331 * @c: controller issuing the reply 332 * @m: message id for flushing 333 * @msg: the message from the controller 334 * 335 * Process reply messages (interrupts in normal scsi controller think). 336 * We can get a variety of messages to process. The normal path is 337 * scsi command completions. We must also deal with IOP failures, 338 * the reply to a bus reset and the reply to a LUN query. 339 * 340 * Returns 0 on success and if the reply should not be flushed or > 0 341 * on success and if the reply should be flushed. Returns negative error 342 * code on failure and if the reply should be flushed. 343 */ 344static int i2o_scsi_reply(struct i2o_controller *c, u32 m, 345 struct i2o_message *msg) 346{ 347 struct scsi_cmnd *cmd; 348 u32 error; 349 struct device *dev; 350 351 cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); 352 if (unlikely(!cmd)) { 353 osm_err("NULL reply received!\n"); 354 return -1; 355 } 356 357 /* 358 * Low byte is device status, next is adapter status, 359 * (then one byte reserved), then request status. 360 */ 361 error = le32_to_cpu(msg->body[0]); 362 363 osm_debug("Completed %0x%p\n", cmd); 364 365 cmd->result = error & 0xff; 366 /* 367 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let 368 * the SCSI layer handle the error 369 */ 370 if (cmd->result) 371 memcpy(cmd->sense_buffer, &msg->body[3], 372 min(SCSI_SENSE_BUFFERSIZE, 40)); 373 374 /* only output error code if AdapterStatus is not HBA_SUCCESS */ 375 if ((error >> 8) & 0xff) 376 osm_err("SCSI error %08x\n", error); 377 378 dev = &c->pdev->dev; 379 380 scsi_dma_unmap(cmd); 381 382 cmd->scsi_done(cmd); 383 384 return 1; 385}; 386 387/** 388 * i2o_scsi_notify_device_add - Retrieve notifications of added devices 389 * @i2o_dev: the I2O device which was added 390 * 391 * If a I2O device is added we catch the notification, because I2O classes 392 * other than SCSI peripheral will not be received through 393 * i2o_scsi_probe(). 394 */ 395static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev) 396{ 397 switch (i2o_dev->lct_data.class_id) { 398 case I2O_CLASS_EXECUTIVE: 399 case I2O_CLASS_RANDOM_BLOCK_STORAGE: 400 i2o_scsi_probe(&i2o_dev->device); 401 break; 402 403 default: 404 break; 405 } 406}; 407 408/** 409 * i2o_scsi_notify_device_remove - Retrieve notifications of removed devices 410 * @i2o_dev: the I2O device which was removed 411 * 412 * If a I2O device is removed, we catch the notification to remove the 413 * corresponding SCSI device. 414 */ 415static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev) 416{ 417 switch (i2o_dev->lct_data.class_id) { 418 case I2O_CLASS_EXECUTIVE: 419 case I2O_CLASS_RANDOM_BLOCK_STORAGE: 420 i2o_scsi_remove(&i2o_dev->device); 421 break; 422 423 default: 424 break; 425 } 426}; 427 428/** 429 * i2o_scsi_notify_controller_add - Retrieve notifications of added controllers 430 * @c: the controller which was added 431 * 432 * If a I2O controller is added, we catch the notification to add a 433 * corresponding Scsi_Host. 434 */ 435static void i2o_scsi_notify_controller_add(struct i2o_controller *c) 436{ 437 struct i2o_scsi_host *i2o_shost; 438 int rc; 439 440 i2o_shost = i2o_scsi_host_alloc(c); 441 if (IS_ERR(i2o_shost)) { 442 osm_err("Could not initialize SCSI host\n"); 443 return; 444 } 445 446 rc = scsi_add_host(i2o_shost->scsi_host, &c->device); 447 if (rc) { 448 osm_err("Could not add SCSI host\n"); 449 scsi_host_put(i2o_shost->scsi_host); 450 return; 451 } 452 453 c->driver_data[i2o_scsi_driver.context] = i2o_shost; 454 455 osm_debug("new I2O SCSI host added\n"); 456}; 457 458/** 459 * i2o_scsi_notify_controller_remove - Retrieve notifications of removed controllers 460 * @c: the controller which was removed 461 * 462 * If a I2O controller is removed, we catch the notification to remove the 463 * corresponding Scsi_Host. 464 */ 465static void i2o_scsi_notify_controller_remove(struct i2o_controller *c) 466{ 467 struct i2o_scsi_host *i2o_shost; 468 i2o_shost = i2o_scsi_get_host(c); 469 if (!i2o_shost) 470 return; 471 472 c->driver_data[i2o_scsi_driver.context] = NULL; 473 474 scsi_remove_host(i2o_shost->scsi_host); 475 scsi_host_put(i2o_shost->scsi_host); 476 osm_debug("I2O SCSI host removed\n"); 477}; 478 479/* SCSI OSM driver struct */ 480static struct i2o_driver i2o_scsi_driver = { 481 .name = OSM_NAME, 482 .reply = i2o_scsi_reply, 483 .classes = i2o_scsi_class_id, 484 .notify_device_add = i2o_scsi_notify_device_add, 485 .notify_device_remove = i2o_scsi_notify_device_remove, 486 .notify_controller_add = i2o_scsi_notify_controller_add, 487 .notify_controller_remove = i2o_scsi_notify_controller_remove, 488 .driver = { 489 .probe = i2o_scsi_probe, 490 .remove = i2o_scsi_remove, 491 }, 492}; 493 494/** 495 * i2o_scsi_queuecommand - queue a SCSI command 496 * @SCpnt: scsi command pointer 497 * @done: callback for completion 498 * 499 * Issue a scsi command asynchronously. Return 0 on success or 1 if 500 * we hit an error (normally message queue congestion). The only 501 * minor complication here is that I2O deals with the device addressing 502 * so we have to map the bus/dev/lun back to an I2O handle as well 503 * as faking absent devices ourself. 504 * 505 * Locks: takes the controller lock on error path only 506 */ 507 508static int i2o_scsi_queuecommand_lck(struct scsi_cmnd *SCpnt, 509 void (*done) (struct scsi_cmnd *)) 510{ 511 struct i2o_controller *c; 512 struct i2o_device *i2o_dev; 513 int tid; 514 struct i2o_message *msg; 515 /* 516 * ENABLE_DISCONNECT 517 * SIMPLE_TAG 518 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME 519 */ 520 u32 scsi_flags = 0x20a00000; 521 u32 sgl_offset; 522 u32 *mptr; 523 u32 cmd = I2O_CMD_SCSI_EXEC << 24; 524 int rc = 0; 525 526 /* 527 * Do the incoming paperwork 528 */ 529 i2o_dev = SCpnt->device->hostdata; 530 531 SCpnt->scsi_done = done; 532 533 if (unlikely(!i2o_dev)) { 534 osm_warn("no I2O device in request\n"); 535 SCpnt->result = DID_NO_CONNECT << 16; 536 done(SCpnt); 537 goto exit; 538 } 539 c = i2o_dev->iop; 540 tid = i2o_dev->lct_data.tid; 541 542 osm_debug("qcmd: Tid = %03x\n", tid); 543 osm_debug("Real scsi messages.\n"); 544 545 /* 546 * Put together a scsi execscb message 547 */ 548 switch (SCpnt->sc_data_direction) { 549 case PCI_DMA_NONE: 550 /* DATA NO XFER */ 551 sgl_offset = SGL_OFFSET_0; 552 break; 553 554 case PCI_DMA_TODEVICE: 555 /* DATA OUT (iop-->dev) */ 556 scsi_flags |= 0x80000000; 557 sgl_offset = SGL_OFFSET_10; 558 break; 559 560 case PCI_DMA_FROMDEVICE: 561 /* DATA IN (iop<--dev) */ 562 scsi_flags |= 0x40000000; 563 sgl_offset = SGL_OFFSET_10; 564 break; 565 566 default: 567 /* Unknown - kill the command */ 568 SCpnt->result = DID_NO_CONNECT << 16; 569 done(SCpnt); 570 goto exit; 571 } 572 573 /* 574 * Obtain an I2O message. If there are none free then 575 * throw it back to the scsi layer 576 */ 577 578 msg = i2o_msg_get(c); 579 if (IS_ERR(msg)) { 580 rc = SCSI_MLQUEUE_HOST_BUSY; 581 goto exit; 582 } 583 584 mptr = &msg->body[0]; 585 586#if 0 /* this code can't work */ 587#ifdef CONFIG_I2O_EXT_ADAPTEC 588 if (c->adaptec) { 589 u32 adpt_flags = 0; 590 591 if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) { 592 i2o_sg_io_hdr_t __user *usr_ptr = 593 ((Sg_request *) (SCpnt->sc_request-> 594 upper_private_data))->header. 595 usr_ptr; 596 597 if (usr_ptr) 598 get_user(adpt_flags, &usr_ptr->flags); 599 } 600 601 switch (i2o_dev->lct_data.class_id) { 602 case I2O_CLASS_EXECUTIVE: 603 case I2O_CLASS_RANDOM_BLOCK_STORAGE: 604 /* interpret flag has to be set for executive */ 605 adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET; 606 break; 607 608 default: 609 break; 610 } 611 612 /* 613 * for Adaptec controllers we use the PRIVATE command, because 614 * the normal SCSI EXEC doesn't support all SCSI commands on 615 * all controllers (for example READ CAPACITY). 616 */ 617 if (sgl_offset == SGL_OFFSET_10) 618 sgl_offset = SGL_OFFSET_12; 619 cmd = I2O_CMD_PRIVATE << 24; 620 *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC); 621 *mptr++ = cpu_to_le32(adpt_flags | tid); 622 } 623#endif 624#endif 625 626 msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); 627 msg->u.s.icntxt = cpu_to_le32(i2o_scsi_driver.context); 628 629 /* We want the SCSI control block back */ 630 msg->u.s.tcntxt = cpu_to_le32(i2o_cntxt_list_add(c, SCpnt)); 631 632 /* LSI_920_PCI_QUIRK 633 * 634 * Intermittant observations of msg frame word data corruption 635 * observed on msg[4] after: 636 * WRITE, READ-MODIFY-WRITE 637 * operations. 19990606 -sralston 638 * 639 * (Hence we build this word via tag. Its good practice anyway 640 * we don't want fetches over PCI needlessly) 641 */ 642 643 /* Attach tags to the devices */ 644 /* FIXME: implement 645 if(SCpnt->device->tagged_supported) { 646 if(SCpnt->tag == HEAD_OF_QUEUE_TAG) 647 scsi_flags |= 0x01000000; 648 else if(SCpnt->tag == ORDERED_QUEUE_TAG) 649 scsi_flags |= 0x01800000; 650 } 651 */ 652 653 *mptr++ = cpu_to_le32(scsi_flags | SCpnt->cmd_len); 654 655 /* Write SCSI command into the message - always 16 byte block */ 656 memcpy(mptr, SCpnt->cmnd, 16); 657 mptr += 4; 658 659 if (sgl_offset != SGL_OFFSET_0) { 660 /* write size of data addressed by SGL */ 661 *mptr++ = cpu_to_le32(scsi_bufflen(SCpnt)); 662 663 /* Now fill in the SGList and command */ 664 665 if (scsi_sg_count(SCpnt)) { 666 if (!i2o_dma_map_sg(c, scsi_sglist(SCpnt), 667 scsi_sg_count(SCpnt), 668 SCpnt->sc_data_direction, &mptr)) 669 goto nomem; 670 } 671 } 672 673 /* Stick the headers on */ 674 msg->u.head[0] = 675 cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset); 676 677 /* Queue the message */ 678 i2o_msg_post(c, msg); 679 680 osm_debug("Issued %0x%p\n", SCpnt); 681 682 return 0; 683 684 nomem: 685 rc = -ENOMEM; 686 i2o_msg_nop(c, msg); 687 688 exit: 689 return rc; 690} 691 692static DEF_SCSI_QCMD(i2o_scsi_queuecommand) 693 694/** 695 * i2o_scsi_abort - abort a running command 696 * @SCpnt: command to abort 697 * 698 * Ask the I2O controller to abort a command. This is an asynchrnous 699 * process and our callback handler will see the command complete with an 700 * aborted message if it succeeds. 701 * 702 * Returns 0 if the command is successfully aborted or negative error code 703 * on failure. 704 */ 705static int i2o_scsi_abort(struct scsi_cmnd *SCpnt) 706{ 707 struct i2o_device *i2o_dev; 708 struct i2o_controller *c; 709 struct i2o_message *msg; 710 int tid; 711 int status = FAILED; 712 713 osm_warn("Aborting command block.\n"); 714 715 i2o_dev = SCpnt->device->hostdata; 716 c = i2o_dev->iop; 717 tid = i2o_dev->lct_data.tid; 718 719 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); 720 if (IS_ERR(msg)) 721 return SCSI_MLQUEUE_HOST_BUSY; 722 723 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); 724 msg->u.head[1] = 725 cpu_to_le32(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid); 726 msg->body[0] = cpu_to_le32(i2o_cntxt_list_get_ptr(c, SCpnt)); 727 728 if (!i2o_msg_post_wait(c, msg, I2O_TIMEOUT_SCSI_SCB_ABORT)) 729 status = SUCCESS; 730 731 return status; 732} 733 734/** 735 * i2o_scsi_bios_param - Invent disk geometry 736 * @sdev: scsi device 737 * @dev: block layer device 738 * @capacity: size in sectors 739 * @ip: geometry array 740 * 741 * This is anyone's guess quite frankly. We use the same rules everyone 742 * else appears to and hope. It seems to work. 743 */ 744 745static int i2o_scsi_bios_param(struct scsi_device *sdev, 746 struct block_device *dev, sector_t capacity, 747 int *ip) 748{ 749 int size; 750 751 size = capacity; 752 ip[0] = 64; /* heads */ 753 ip[1] = 32; /* sectors */ 754 if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */ 755 ip[0] = 255; /* heads */ 756 ip[1] = 63; /* sectors */ 757 ip[2] = size / (255 * 63); /* cylinders */ 758 } 759 return 0; 760} 761 762static struct scsi_host_template i2o_scsi_host_template = { 763 .proc_name = OSM_NAME, 764 .name = OSM_DESCRIPTION, 765 .info = i2o_scsi_info, 766 .queuecommand = i2o_scsi_queuecommand, 767 .eh_abort_handler = i2o_scsi_abort, 768 .bios_param = i2o_scsi_bios_param, 769 .can_queue = I2O_SCSI_CAN_QUEUE, 770 .sg_tablesize = 8, 771 .cmd_per_lun = 6, 772 .use_clustering = ENABLE_CLUSTERING, 773}; 774 775/** 776 * i2o_scsi_init - SCSI OSM initialization function 777 * 778 * Register SCSI OSM into I2O core. 779 * 780 * Returns 0 on success or negative error code on failure. 781 */ 782static int __init i2o_scsi_init(void) 783{ 784 int rc; 785 786 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); 787 788 /* Register SCSI OSM into I2O core */ 789 rc = i2o_driver_register(&i2o_scsi_driver); 790 if (rc) { 791 osm_err("Could not register SCSI driver\n"); 792 return rc; 793 } 794 795 return 0; 796}; 797 798/** 799 * i2o_scsi_exit - SCSI OSM exit function 800 * 801 * Unregisters SCSI OSM from I2O core. 802 */ 803static void __exit i2o_scsi_exit(void) 804{ 805 /* Unregister I2O SCSI OSM from I2O core */ 806 i2o_driver_unregister(&i2o_scsi_driver); 807}; 808 809MODULE_AUTHOR("Red Hat Software"); 810MODULE_LICENSE("GPL"); 811MODULE_DESCRIPTION(OSM_DESCRIPTION); 812MODULE_VERSION(OSM_VERSION); 813 814module_init(i2o_scsi_init); 815module_exit(i2o_scsi_exit); 816