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 "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 u64 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 (%llu) >= max_lun of I2O host (%llu)", 291 le64_to_cpu(lun), scsi_host->max_lun); 292 return -EFAULT; 293 } 294 295 scsi_dev = 296 __scsi_add_device(i2o_shost->scsi_host, channel, le32_to_cpu(id), 297 le64_to_cpu(lun), i2o_dev); 298 299 if (IS_ERR(scsi_dev)) { 300 osm_warn("can not add SCSI device %03x\n", 301 i2o_dev->lct_data.tid); 302 return PTR_ERR(scsi_dev); 303 } 304 305 rc = sysfs_create_link(&i2o_dev->device.kobj, 306 &scsi_dev->sdev_gendev.kobj, "scsi"); 307 if (rc) 308 goto err; 309 310 osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %llu\n", 311 i2o_dev->lct_data.tid, channel, le32_to_cpu(id), 312 le64_to_cpu(lun)); 313 314 return 0; 315 316err: 317 scsi_remove_device(scsi_dev); 318 return rc; 319}; 320 321static const char *i2o_scsi_info(struct Scsi_Host *SChost) 322{ 323 struct i2o_scsi_host *hostdata; 324 hostdata = (struct i2o_scsi_host *)SChost->hostdata; 325 return hostdata->iop->name; 326} 327 328/** 329 * i2o_scsi_reply - SCSI OSM message reply handler 330 * @c: controller issuing the reply 331 * @m: message id for flushing 332 * @msg: the message from the controller 333 * 334 * Process reply messages (interrupts in normal scsi controller think). 335 * We can get a variety of messages to process. The normal path is 336 * scsi command completions. We must also deal with IOP failures, 337 * the reply to a bus reset and the reply to a LUN query. 338 * 339 * Returns 0 on success and if the reply should not be flushed or > 0 340 * on success and if the reply should be flushed. Returns negative error 341 * code on failure and if the reply should be flushed. 342 */ 343static int i2o_scsi_reply(struct i2o_controller *c, u32 m, 344 struct i2o_message *msg) 345{ 346 struct scsi_cmnd *cmd; 347 u32 error; 348 struct device *dev; 349 350 cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); 351 if (unlikely(!cmd)) { 352 osm_err("NULL reply received!\n"); 353 return -1; 354 } 355 356 /* 357 * Low byte is device status, next is adapter status, 358 * (then one byte reserved), then request status. 359 */ 360 error = le32_to_cpu(msg->body[0]); 361 362 osm_debug("Completed %0x%p\n", cmd); 363 364 cmd->result = error & 0xff; 365 /* 366 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let 367 * the SCSI layer handle the error 368 */ 369 if (cmd->result) 370 memcpy(cmd->sense_buffer, &msg->body[3], 371 min(SCSI_SENSE_BUFFERSIZE, 40)); 372 373 /* only output error code if AdapterStatus is not HBA_SUCCESS */ 374 if ((error >> 8) & 0xff) 375 osm_err("SCSI error %08x\n", error); 376 377 dev = &c->pdev->dev; 378 379 scsi_dma_unmap(cmd); 380 381 cmd->scsi_done(cmd); 382 383 return 1; 384}; 385 386/** 387 * i2o_scsi_notify_device_add - Retrieve notifications of added devices 388 * @i2o_dev: the I2O device which was added 389 * 390 * If a I2O device is added we catch the notification, because I2O classes 391 * other than SCSI peripheral will not be received through 392 * i2o_scsi_probe(). 393 */ 394static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev) 395{ 396 switch (i2o_dev->lct_data.class_id) { 397 case I2O_CLASS_EXECUTIVE: 398 case I2O_CLASS_RANDOM_BLOCK_STORAGE: 399 i2o_scsi_probe(&i2o_dev->device); 400 break; 401 402 default: 403 break; 404 } 405}; 406 407/** 408 * i2o_scsi_notify_device_remove - Retrieve notifications of removed devices 409 * @i2o_dev: the I2O device which was removed 410 * 411 * If a I2O device is removed, we catch the notification to remove the 412 * corresponding SCSI device. 413 */ 414static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev) 415{ 416 switch (i2o_dev->lct_data.class_id) { 417 case I2O_CLASS_EXECUTIVE: 418 case I2O_CLASS_RANDOM_BLOCK_STORAGE: 419 i2o_scsi_remove(&i2o_dev->device); 420 break; 421 422 default: 423 break; 424 } 425}; 426 427/** 428 * i2o_scsi_notify_controller_add - Retrieve notifications of added controllers 429 * @c: the controller which was added 430 * 431 * If a I2O controller is added, we catch the notification to add a 432 * corresponding Scsi_Host. 433 */ 434static void i2o_scsi_notify_controller_add(struct i2o_controller *c) 435{ 436 struct i2o_scsi_host *i2o_shost; 437 int rc; 438 439 i2o_shost = i2o_scsi_host_alloc(c); 440 if (IS_ERR(i2o_shost)) { 441 osm_err("Could not initialize SCSI host\n"); 442 return; 443 } 444 445 rc = scsi_add_host(i2o_shost->scsi_host, &c->device); 446 if (rc) { 447 osm_err("Could not add SCSI host\n"); 448 scsi_host_put(i2o_shost->scsi_host); 449 return; 450 } 451 452 c->driver_data[i2o_scsi_driver.context] = i2o_shost; 453 454 osm_debug("new I2O SCSI host added\n"); 455}; 456 457/** 458 * i2o_scsi_notify_controller_remove - Retrieve notifications of removed controllers 459 * @c: the controller which was removed 460 * 461 * If a I2O controller is removed, we catch the notification to remove the 462 * corresponding Scsi_Host. 463 */ 464static void i2o_scsi_notify_controller_remove(struct i2o_controller *c) 465{ 466 struct i2o_scsi_host *i2o_shost; 467 i2o_shost = i2o_scsi_get_host(c); 468 if (!i2o_shost) 469 return; 470 471 c->driver_data[i2o_scsi_driver.context] = NULL; 472 473 scsi_remove_host(i2o_shost->scsi_host); 474 scsi_host_put(i2o_shost->scsi_host); 475 osm_debug("I2O SCSI host removed\n"); 476}; 477 478/* SCSI OSM driver struct */ 479static struct i2o_driver i2o_scsi_driver = { 480 .name = OSM_NAME, 481 .reply = i2o_scsi_reply, 482 .classes = i2o_scsi_class_id, 483 .notify_device_add = i2o_scsi_notify_device_add, 484 .notify_device_remove = i2o_scsi_notify_device_remove, 485 .notify_controller_add = i2o_scsi_notify_controller_add, 486 .notify_controller_remove = i2o_scsi_notify_controller_remove, 487 .driver = { 488 .probe = i2o_scsi_probe, 489 .remove = i2o_scsi_remove, 490 }, 491}; 492 493/** 494 * i2o_scsi_queuecommand - queue a SCSI command 495 * @SCpnt: scsi command pointer 496 * @done: callback for completion 497 * 498 * Issue a scsi command asynchronously. Return 0 on success or 1 if 499 * we hit an error (normally message queue congestion). The only 500 * minor complication here is that I2O deals with the device addressing 501 * so we have to map the bus/dev/lun back to an I2O handle as well 502 * as faking absent devices ourself. 503 * 504 * Locks: takes the controller lock on error path only 505 */ 506 507static int i2o_scsi_queuecommand_lck(struct scsi_cmnd *SCpnt, 508 void (*done) (struct scsi_cmnd *)) 509{ 510 struct i2o_controller *c; 511 struct i2o_device *i2o_dev; 512 int tid; 513 struct i2o_message *msg; 514 /* 515 * ENABLE_DISCONNECT 516 * SIMPLE_TAG 517 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME 518 */ 519 u32 scsi_flags = 0x20a00000; 520 u32 sgl_offset; 521 u32 *mptr; 522 u32 cmd = I2O_CMD_SCSI_EXEC << 24; 523 int rc = 0; 524 525 /* 526 * Do the incoming paperwork 527 */ 528 i2o_dev = SCpnt->device->hostdata; 529 530 SCpnt->scsi_done = done; 531 532 if (unlikely(!i2o_dev)) { 533 osm_warn("no I2O device in request\n"); 534 SCpnt->result = DID_NO_CONNECT << 16; 535 done(SCpnt); 536 goto exit; 537 } 538 c = i2o_dev->iop; 539 tid = i2o_dev->lct_data.tid; 540 541 osm_debug("qcmd: Tid = %03x\n", tid); 542 osm_debug("Real scsi messages.\n"); 543 544 /* 545 * Put together a scsi execscb message 546 */ 547 switch (SCpnt->sc_data_direction) { 548 case PCI_DMA_NONE: 549 /* DATA NO XFER */ 550 sgl_offset = SGL_OFFSET_0; 551 break; 552 553 case PCI_DMA_TODEVICE: 554 /* DATA OUT (iop-->dev) */ 555 scsi_flags |= 0x80000000; 556 sgl_offset = SGL_OFFSET_10; 557 break; 558 559 case PCI_DMA_FROMDEVICE: 560 /* DATA IN (iop<--dev) */ 561 scsi_flags |= 0x40000000; 562 sgl_offset = SGL_OFFSET_10; 563 break; 564 565 default: 566 /* Unknown - kill the command */ 567 SCpnt->result = DID_NO_CONNECT << 16; 568 done(SCpnt); 569 goto exit; 570 } 571 572 /* 573 * Obtain an I2O message. If there are none free then 574 * throw it back to the scsi layer 575 */ 576 577 msg = i2o_msg_get(c); 578 if (IS_ERR(msg)) { 579 rc = SCSI_MLQUEUE_HOST_BUSY; 580 goto exit; 581 } 582 583 mptr = &msg->body[0]; 584 585#if 0 /* this code can't work */ 586#ifdef CONFIG_I2O_EXT_ADAPTEC 587 if (c->adaptec) { 588 u32 adpt_flags = 0; 589 590 if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) { 591 i2o_sg_io_hdr_t __user *usr_ptr = 592 ((Sg_request *) (SCpnt->sc_request-> 593 upper_private_data))->header. 594 usr_ptr; 595 596 if (usr_ptr) 597 get_user(adpt_flags, &usr_ptr->flags); 598 } 599 600 switch (i2o_dev->lct_data.class_id) { 601 case I2O_CLASS_EXECUTIVE: 602 case I2O_CLASS_RANDOM_BLOCK_STORAGE: 603 /* interpret flag has to be set for executive */ 604 adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET; 605 break; 606 607 default: 608 break; 609 } 610 611 /* 612 * for Adaptec controllers we use the PRIVATE command, because 613 * the normal SCSI EXEC doesn't support all SCSI commands on 614 * all controllers (for example READ CAPACITY). 615 */ 616 if (sgl_offset == SGL_OFFSET_10) 617 sgl_offset = SGL_OFFSET_12; 618 cmd = I2O_CMD_PRIVATE << 24; 619 *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC); 620 *mptr++ = cpu_to_le32(adpt_flags | tid); 621 } 622#endif 623#endif 624 625 msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); 626 msg->u.s.icntxt = cpu_to_le32(i2o_scsi_driver.context); 627 628 /* We want the SCSI control block back */ 629 msg->u.s.tcntxt = cpu_to_le32(i2o_cntxt_list_add(c, SCpnt)); 630 631 /* LSI_920_PCI_QUIRK 632 * 633 * Intermittant observations of msg frame word data corruption 634 * observed on msg[4] after: 635 * WRITE, READ-MODIFY-WRITE 636 * operations. 19990606 -sralston 637 * 638 * (Hence we build this word via tag. Its good practice anyway 639 * we don't want fetches over PCI needlessly) 640 */ 641 642 /* Attach tags to the devices */ 643 /* FIXME: implement 644 if(SCpnt->device->tagged_supported) { 645 if(SCpnt->tag == HEAD_OF_QUEUE_TAG) 646 scsi_flags |= 0x01000000; 647 else if(SCpnt->tag == ORDERED_QUEUE_TAG) 648 scsi_flags |= 0x01800000; 649 } 650 */ 651 652 *mptr++ = cpu_to_le32(scsi_flags | SCpnt->cmd_len); 653 654 /* Write SCSI command into the message - always 16 byte block */ 655 memcpy(mptr, SCpnt->cmnd, 16); 656 mptr += 4; 657 658 if (sgl_offset != SGL_OFFSET_0) { 659 /* write size of data addressed by SGL */ 660 *mptr++ = cpu_to_le32(scsi_bufflen(SCpnt)); 661 662 /* Now fill in the SGList and command */ 663 664 if (scsi_sg_count(SCpnt)) { 665 if (!i2o_dma_map_sg(c, scsi_sglist(SCpnt), 666 scsi_sg_count(SCpnt), 667 SCpnt->sc_data_direction, &mptr)) 668 goto nomem; 669 } 670 } 671 672 /* Stick the headers on */ 673 msg->u.head[0] = 674 cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset); 675 676 /* Queue the message */ 677 i2o_msg_post(c, msg); 678 679 osm_debug("Issued %0x%p\n", SCpnt); 680 681 return 0; 682 683 nomem: 684 rc = -ENOMEM; 685 i2o_msg_nop(c, msg); 686 687 exit: 688 return rc; 689} 690 691static DEF_SCSI_QCMD(i2o_scsi_queuecommand) 692 693/** 694 * i2o_scsi_abort - abort a running command 695 * @SCpnt: command to abort 696 * 697 * Ask the I2O controller to abort a command. This is an asynchrnous 698 * process and our callback handler will see the command complete with an 699 * aborted message if it succeeds. 700 * 701 * Returns 0 if the command is successfully aborted or negative error code 702 * on failure. 703 */ 704static int i2o_scsi_abort(struct scsi_cmnd *SCpnt) 705{ 706 struct i2o_device *i2o_dev; 707 struct i2o_controller *c; 708 struct i2o_message *msg; 709 int tid; 710 int status = FAILED; 711 712 osm_warn("Aborting command block.\n"); 713 714 i2o_dev = SCpnt->device->hostdata; 715 c = i2o_dev->iop; 716 tid = i2o_dev->lct_data.tid; 717 718 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); 719 if (IS_ERR(msg)) 720 return SCSI_MLQUEUE_HOST_BUSY; 721 722 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); 723 msg->u.head[1] = 724 cpu_to_le32(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid); 725 msg->body[0] = cpu_to_le32(i2o_cntxt_list_get_ptr(c, SCpnt)); 726 727 if (!i2o_msg_post_wait(c, msg, I2O_TIMEOUT_SCSI_SCB_ABORT)) 728 status = SUCCESS; 729 730 return status; 731} 732 733/** 734 * i2o_scsi_bios_param - Invent disk geometry 735 * @sdev: scsi device 736 * @dev: block layer device 737 * @capacity: size in sectors 738 * @ip: geometry array 739 * 740 * This is anyone's guess quite frankly. We use the same rules everyone 741 * else appears to and hope. It seems to work. 742 */ 743 744static int i2o_scsi_bios_param(struct scsi_device *sdev, 745 struct block_device *dev, sector_t capacity, 746 int *ip) 747{ 748 int size; 749 750 size = capacity; 751 ip[0] = 64; /* heads */ 752 ip[1] = 32; /* sectors */ 753 if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */ 754 ip[0] = 255; /* heads */ 755 ip[1] = 63; /* sectors */ 756 ip[2] = size / (255 * 63); /* cylinders */ 757 } 758 return 0; 759} 760 761static struct scsi_host_template i2o_scsi_host_template = { 762 .proc_name = OSM_NAME, 763 .name = OSM_DESCRIPTION, 764 .info = i2o_scsi_info, 765 .queuecommand = i2o_scsi_queuecommand, 766 .eh_abort_handler = i2o_scsi_abort, 767 .bios_param = i2o_scsi_bios_param, 768 .can_queue = I2O_SCSI_CAN_QUEUE, 769 .sg_tablesize = 8, 770 .cmd_per_lun = 6, 771 .use_clustering = ENABLE_CLUSTERING, 772}; 773 774/** 775 * i2o_scsi_init - SCSI OSM initialization function 776 * 777 * Register SCSI OSM into I2O core. 778 * 779 * Returns 0 on success or negative error code on failure. 780 */ 781static int __init i2o_scsi_init(void) 782{ 783 int rc; 784 785 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); 786 787 /* Register SCSI OSM into I2O core */ 788 rc = i2o_driver_register(&i2o_scsi_driver); 789 if (rc) { 790 osm_err("Could not register SCSI driver\n"); 791 return rc; 792 } 793 794 return 0; 795}; 796 797/** 798 * i2o_scsi_exit - SCSI OSM exit function 799 * 800 * Unregisters SCSI OSM from I2O core. 801 */ 802static void __exit i2o_scsi_exit(void) 803{ 804 /* Unregister I2O SCSI OSM from I2O core */ 805 i2o_driver_unregister(&i2o_scsi_driver); 806}; 807 808MODULE_AUTHOR("Red Hat Software"); 809MODULE_LICENSE("GPL"); 810MODULE_DESCRIPTION(OSM_DESCRIPTION); 811MODULE_VERSION(OSM_VERSION); 812 813module_init(i2o_scsi_init); 814module_exit(i2o_scsi_exit); 815