1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Jeff Garzik <jgarzik@pobox.com> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/kernel.h> 37 #include <linux/blkdev.h> 38 #include <linux/spinlock.h> 39 #include <scsi/scsi.h> 40 #include <scsi/scsi_host.h> 41 #include <scsi/scsi_cmnd.h> 42 #include <scsi/scsi_eh.h> 43 #include <scsi/scsi_device.h> 44 #include <scsi/scsi_tcq.h> 45 #include <scsi/scsi_transport.h> 46 #include <linux/libata.h> 47 #include <linux/hdreg.h> 48 #include <asm/uaccess.h> 49 50 #include "libata.h" 51 52 #define SECTOR_SIZE 512 53 54 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 55 56 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap, 57 const struct scsi_device *scsidev); 58 static struct ata_device * ata_scsi_find_dev(struct ata_port *ap, 59 const struct scsi_device *scsidev); 60 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 61 unsigned int id, unsigned int lun); 62 63 64 #define RW_RECOVERY_MPAGE 0x1 65 #define RW_RECOVERY_MPAGE_LEN 12 66 #define CACHE_MPAGE 0x8 67 #define CACHE_MPAGE_LEN 20 68 #define CONTROL_MPAGE 0xa 69 #define CONTROL_MPAGE_LEN 12 70 #define ALL_MPAGES 0x3f 71 #define ALL_SUB_MPAGES 0xff 72 73 74 static const u8 def_rw_recovery_mpage[] = { 75 RW_RECOVERY_MPAGE, 76 RW_RECOVERY_MPAGE_LEN - 2, 77 (1 << 7) | /* AWRE, sat-r06 say it shall be 0 */ 78 (1 << 6), /* ARRE (auto read reallocation) */ 79 0, /* read retry count */ 80 0, 0, 0, 0, 81 0, /* write retry count */ 82 0, 0, 0 83 }; 84 85 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 86 CACHE_MPAGE, 87 CACHE_MPAGE_LEN - 2, 88 0, /* contains WCE, needs to be 0 for logic */ 89 0, 0, 0, 0, 0, 0, 0, 0, 0, 90 0, /* contains DRA, needs to be 0 for logic */ 91 0, 0, 0, 0, 0, 0, 0 92 }; 93 94 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 95 CONTROL_MPAGE, 96 CONTROL_MPAGE_LEN - 2, 97 2, /* DSENSE=0, GLTSD=1 */ 98 0, /* [QAM+QERR may be 1, see 05-359r1] */ 99 0, 0, 0, 0, 0xff, 0xff, 100 0, 30 /* extended self test time, see 05-359r1 */ 101 }; 102 103 /* 104 * libata transport template. libata doesn't do real transport stuff. 105 * It just needs the eh_timed_out hook. 106 */ 107 struct scsi_transport_template ata_scsi_transport_template = { 108 .eh_strategy_handler = ata_scsi_error, 109 .eh_timed_out = ata_scsi_timed_out, 110 .user_scan = ata_scsi_user_scan, 111 }; 112 113 114 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd, 115 void (*done)(struct scsi_cmnd *)) 116 { 117 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 118 /* "Invalid field in cbd" */ 119 done(cmd); 120 } 121 122 /** 123 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 124 * @sdev: SCSI device for which BIOS geometry is to be determined 125 * @bdev: block device associated with @sdev 126 * @capacity: capacity of SCSI device 127 * @geom: location to which geometry will be output 128 * 129 * Generic bios head/sector/cylinder calculator 130 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 131 * mapping. Some situations may arise where the disk is not 132 * bootable if this is not used. 133 * 134 * LOCKING: 135 * Defined by the SCSI layer. We don't really care. 136 * 137 * RETURNS: 138 * Zero. 139 */ 140 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 141 sector_t capacity, int geom[]) 142 { 143 geom[0] = 255; 144 geom[1] = 63; 145 sector_div(capacity, 255*63); 146 geom[2] = capacity; 147 148 return 0; 149 } 150 151 /** 152 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 153 * @sdev: SCSI device to get identify data for 154 * @arg: User buffer area for identify data 155 * 156 * LOCKING: 157 * Defined by the SCSI layer. We don't really care. 158 * 159 * RETURNS: 160 * Zero on success, negative errno on error. 161 */ 162 static int ata_get_identity(struct scsi_device *sdev, void __user *arg) 163 { 164 struct ata_port *ap = ata_shost_to_port(sdev->host); 165 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 166 u16 __user *dst = arg; 167 char buf[40]; 168 169 if (!dev) 170 return -ENOMSG; 171 172 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 173 return -EFAULT; 174 175 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 176 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 177 return -EFAULT; 178 179 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 180 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 181 return -EFAULT; 182 183 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 184 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 185 return -EFAULT; 186 187 return 0; 188 } 189 190 /** 191 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 192 * @scsidev: Device to which we are issuing command 193 * @arg: User provided data for issuing command 194 * 195 * LOCKING: 196 * Defined by the SCSI layer. We don't really care. 197 * 198 * RETURNS: 199 * Zero on success, negative errno on error. 200 */ 201 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 202 { 203 int rc = 0; 204 u8 scsi_cmd[MAX_COMMAND_SIZE]; 205 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 206 int argsize = 0; 207 enum dma_data_direction data_dir; 208 int cmd_result; 209 210 if (arg == NULL) 211 return -EINVAL; 212 213 if (copy_from_user(args, arg, sizeof(args))) 214 return -EFAULT; 215 216 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 217 if (!sensebuf) 218 return -ENOMEM; 219 220 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 221 222 if (args[3]) { 223 argsize = SECTOR_SIZE * args[3]; 224 argbuf = kmalloc(argsize, GFP_KERNEL); 225 if (argbuf == NULL) { 226 rc = -ENOMEM; 227 goto error; 228 } 229 230 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 231 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 232 block count in sector count field */ 233 data_dir = DMA_FROM_DEVICE; 234 } else { 235 scsi_cmd[1] = (3 << 1); /* Non-data */ 236 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 237 data_dir = DMA_NONE; 238 } 239 240 scsi_cmd[0] = ATA_16; 241 242 scsi_cmd[4] = args[2]; 243 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */ 244 scsi_cmd[6] = args[3]; 245 scsi_cmd[8] = args[1]; 246 scsi_cmd[10] = 0x4f; 247 scsi_cmd[12] = 0xc2; 248 } else { 249 scsi_cmd[6] = args[1]; 250 } 251 scsi_cmd[14] = args[0]; 252 253 /* Good values for timeout and retries? Values below 254 from scsi_ioctl_send_command() for default case... */ 255 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 256 sensebuf, (10*HZ), 5, 0); 257 258 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 259 u8 *desc = sensebuf + 8; 260 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 261 262 /* If we set cc then ATA pass-through will cause a 263 * check condition even if no error. Filter that. */ 264 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 265 struct scsi_sense_hdr sshdr; 266 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 267 &sshdr); 268 if (sshdr.sense_key==0 && 269 sshdr.asc==0 && sshdr.ascq==0) 270 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 271 } 272 273 /* Send userspace a few ATA registers (same as drivers/ide) */ 274 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 275 desc[0] == 0x09 ) { /* code is "ATA Descriptor" */ 276 args[0] = desc[13]; /* status */ 277 args[1] = desc[3]; /* error */ 278 args[2] = desc[5]; /* sector count (0:7) */ 279 if (copy_to_user(arg, args, sizeof(args))) 280 rc = -EFAULT; 281 } 282 } 283 284 285 if (cmd_result) { 286 rc = -EIO; 287 goto error; 288 } 289 290 if ((argbuf) 291 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 292 rc = -EFAULT; 293 error: 294 kfree(sensebuf); 295 kfree(argbuf); 296 return rc; 297 } 298 299 /** 300 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 301 * @scsidev: Device to which we are issuing command 302 * @arg: User provided data for issuing command 303 * 304 * LOCKING: 305 * Defined by the SCSI layer. We don't really care. 306 * 307 * RETURNS: 308 * Zero on success, negative errno on error. 309 */ 310 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 311 { 312 int rc = 0; 313 u8 scsi_cmd[MAX_COMMAND_SIZE]; 314 u8 args[7], *sensebuf = NULL; 315 int cmd_result; 316 317 if (arg == NULL) 318 return -EINVAL; 319 320 if (copy_from_user(args, arg, sizeof(args))) 321 return -EFAULT; 322 323 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 324 if (!sensebuf) 325 return -ENOMEM; 326 327 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 328 scsi_cmd[0] = ATA_16; 329 scsi_cmd[1] = (3 << 1); /* Non-data */ 330 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 331 scsi_cmd[4] = args[1]; 332 scsi_cmd[6] = args[2]; 333 scsi_cmd[8] = args[3]; 334 scsi_cmd[10] = args[4]; 335 scsi_cmd[12] = args[5]; 336 scsi_cmd[13] = args[6] & 0x0f; 337 scsi_cmd[14] = args[0]; 338 339 /* Good values for timeout and retries? Values below 340 from scsi_ioctl_send_command() for default case... */ 341 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 342 sensebuf, (10*HZ), 5, 0); 343 344 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 345 u8 *desc = sensebuf + 8; 346 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 347 348 /* If we set cc then ATA pass-through will cause a 349 * check condition even if no error. Filter that. */ 350 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 351 struct scsi_sense_hdr sshdr; 352 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 353 &sshdr); 354 if (sshdr.sense_key==0 && 355 sshdr.asc==0 && sshdr.ascq==0) 356 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 357 } 358 359 /* Send userspace ATA registers */ 360 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 361 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 362 args[0] = desc[13]; /* status */ 363 args[1] = desc[3]; /* error */ 364 args[2] = desc[5]; /* sector count (0:7) */ 365 args[3] = desc[7]; /* lbal */ 366 args[4] = desc[9]; /* lbam */ 367 args[5] = desc[11]; /* lbah */ 368 args[6] = desc[12]; /* select */ 369 if (copy_to_user(arg, args, sizeof(args))) 370 rc = -EFAULT; 371 } 372 } 373 374 if (cmd_result) { 375 rc = -EIO; 376 goto error; 377 } 378 379 error: 380 kfree(sensebuf); 381 return rc; 382 } 383 384 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 385 { 386 int val = -EINVAL, rc = -EINVAL; 387 388 switch (cmd) { 389 case ATA_IOC_GET_IO32: 390 val = 0; 391 if (copy_to_user(arg, &val, 1)) 392 return -EFAULT; 393 return 0; 394 395 case ATA_IOC_SET_IO32: 396 val = (unsigned long) arg; 397 if (val != 0) 398 return -EINVAL; 399 return 0; 400 401 case HDIO_GET_IDENTITY: 402 return ata_get_identity(scsidev, arg); 403 404 case HDIO_DRIVE_CMD: 405 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 406 return -EACCES; 407 return ata_cmd_ioctl(scsidev, arg); 408 409 case HDIO_DRIVE_TASK: 410 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 411 return -EACCES; 412 return ata_task_ioctl(scsidev, arg); 413 414 default: 415 rc = -ENOTTY; 416 break; 417 } 418 419 return rc; 420 } 421 422 /** 423 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 424 * @dev: ATA device to which the new command is attached 425 * @cmd: SCSI command that originated this ATA command 426 * @done: SCSI command completion function 427 * 428 * Obtain a reference to an unused ata_queued_cmd structure, 429 * which is the basic libata structure representing a single 430 * ATA command sent to the hardware. 431 * 432 * If a command was available, fill in the SCSI-specific 433 * portions of the structure with information on the 434 * current command. 435 * 436 * LOCKING: 437 * spin_lock_irqsave(host lock) 438 * 439 * RETURNS: 440 * Command allocated, or %NULL if none available. 441 */ 442 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 443 struct scsi_cmnd *cmd, 444 void (*done)(struct scsi_cmnd *)) 445 { 446 struct ata_queued_cmd *qc; 447 448 qc = ata_qc_new_init(dev); 449 if (qc) { 450 qc->scsicmd = cmd; 451 qc->scsidone = done; 452 453 if (cmd->use_sg) { 454 qc->__sg = (struct scatterlist *) cmd->request_buffer; 455 qc->n_elem = cmd->use_sg; 456 } else if (cmd->request_bufflen) { 457 qc->__sg = &qc->sgent; 458 qc->n_elem = 1; 459 } 460 } else { 461 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 462 done(cmd); 463 } 464 465 return qc; 466 } 467 468 /** 469 * ata_dump_status - user friendly display of error info 470 * @id: id of the port in question 471 * @tf: ptr to filled out taskfile 472 * 473 * Decode and dump the ATA error/status registers for the user so 474 * that they have some idea what really happened at the non 475 * make-believe layer. 476 * 477 * LOCKING: 478 * inherited from caller 479 */ 480 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 481 { 482 u8 stat = tf->command, err = tf->feature; 483 484 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 485 if (stat & ATA_BUSY) { 486 printk("Busy }\n"); /* Data is not valid in this case */ 487 } else { 488 if (stat & 0x40) printk("DriveReady "); 489 if (stat & 0x20) printk("DeviceFault "); 490 if (stat & 0x10) printk("SeekComplete "); 491 if (stat & 0x08) printk("DataRequest "); 492 if (stat & 0x04) printk("CorrectedError "); 493 if (stat & 0x02) printk("Index "); 494 if (stat & 0x01) printk("Error "); 495 printk("}\n"); 496 497 if (err) { 498 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 499 if (err & 0x04) printk("DriveStatusError "); 500 if (err & 0x80) { 501 if (err & 0x04) printk("BadCRC "); 502 else printk("Sector "); 503 } 504 if (err & 0x40) printk("UncorrectableError "); 505 if (err & 0x10) printk("SectorIdNotFound "); 506 if (err & 0x02) printk("TrackZeroNotFound "); 507 if (err & 0x01) printk("AddrMarkNotFound "); 508 printk("}\n"); 509 } 510 } 511 } 512 513 /** 514 * ata_scsi_device_suspend - suspend ATA device associated with sdev 515 * @sdev: the SCSI device to suspend 516 * @mesg: target power management message 517 * 518 * Request suspend EH action on the ATA device associated with 519 * @sdev and wait for the operation to complete. 520 * 521 * LOCKING: 522 * Kernel thread context (may sleep). 523 * 524 * RETURNS: 525 * 0 on success, -errno otherwise. 526 */ 527 int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t mesg) 528 { 529 struct ata_port *ap = ata_shost_to_port(sdev->host); 530 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 531 unsigned long flags; 532 unsigned int action; 533 int rc = 0; 534 535 if (!dev) 536 goto out; 537 538 spin_lock_irqsave(ap->lock, flags); 539 540 /* wait for the previous resume to complete */ 541 while (dev->flags & ATA_DFLAG_SUSPENDED) { 542 spin_unlock_irqrestore(ap->lock, flags); 543 ata_port_wait_eh(ap); 544 spin_lock_irqsave(ap->lock, flags); 545 } 546 547 /* if @sdev is already detached, nothing to do */ 548 if (sdev->sdev_state == SDEV_OFFLINE || 549 sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL) 550 goto out_unlock; 551 552 /* request suspend */ 553 action = ATA_EH_SUSPEND; 554 if (mesg.event != PM_EVENT_SUSPEND) 555 action |= ATA_EH_PM_FREEZE; 556 ap->eh_info.dev_action[dev->devno] |= action; 557 ap->eh_info.flags |= ATA_EHI_QUIET; 558 ata_port_schedule_eh(ap); 559 560 spin_unlock_irqrestore(ap->lock, flags); 561 562 /* wait for EH to do the job */ 563 ata_port_wait_eh(ap); 564 565 spin_lock_irqsave(ap->lock, flags); 566 567 /* If @sdev is still attached but the associated ATA device 568 * isn't suspended, the operation failed. 569 */ 570 if (sdev->sdev_state != SDEV_OFFLINE && 571 sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL && 572 !(dev->flags & ATA_DFLAG_SUSPENDED)) 573 rc = -EIO; 574 575 out_unlock: 576 spin_unlock_irqrestore(ap->lock, flags); 577 out: 578 if (rc == 0) 579 sdev->sdev_gendev.power.power_state = mesg; 580 return rc; 581 } 582 583 /** 584 * ata_scsi_device_resume - resume ATA device associated with sdev 585 * @sdev: the SCSI device to resume 586 * 587 * Request resume EH action on the ATA device associated with 588 * @sdev and return immediately. This enables parallel 589 * wakeup/spinup of devices. 590 * 591 * LOCKING: 592 * Kernel thread context (may sleep). 593 * 594 * RETURNS: 595 * 0. 596 */ 597 int ata_scsi_device_resume(struct scsi_device *sdev) 598 { 599 struct ata_port *ap = ata_shost_to_port(sdev->host); 600 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 601 struct ata_eh_info *ehi = &ap->eh_info; 602 unsigned long flags; 603 unsigned int action; 604 605 if (!dev) 606 goto out; 607 608 spin_lock_irqsave(ap->lock, flags); 609 610 /* if @sdev is already detached, nothing to do */ 611 if (sdev->sdev_state == SDEV_OFFLINE || 612 sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL) 613 goto out_unlock; 614 615 /* request resume */ 616 action = ATA_EH_RESUME; 617 if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND) 618 __ata_ehi_hotplugged(ehi); 619 else 620 action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET; 621 ehi->dev_action[dev->devno] |= action; 622 623 /* We don't want autopsy and verbose EH messages. Disable 624 * those if we're the only device on this link. 625 */ 626 if (ata_port_max_devices(ap) == 1) 627 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET; 628 629 ata_port_schedule_eh(ap); 630 631 out_unlock: 632 spin_unlock_irqrestore(ap->lock, flags); 633 out: 634 sdev->sdev_gendev.power.power_state = PMSG_ON; 635 return 0; 636 } 637 638 /** 639 * ata_to_sense_error - convert ATA error to SCSI error 640 * @id: ATA device number 641 * @drv_stat: value contained in ATA status register 642 * @drv_err: value contained in ATA error register 643 * @sk: the sense key we'll fill out 644 * @asc: the additional sense code we'll fill out 645 * @ascq: the additional sense code qualifier we'll fill out 646 * @verbose: be verbose 647 * 648 * Converts an ATA error into a SCSI error. Fill out pointers to 649 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 650 * format sense blocks. 651 * 652 * LOCKING: 653 * spin_lock_irqsave(host lock) 654 */ 655 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 656 u8 *asc, u8 *ascq, int verbose) 657 { 658 int i; 659 660 /* Based on the 3ware driver translation table */ 661 static const unsigned char sense_table[][4] = { 662 /* BBD|ECC|ID|MAR */ 663 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 664 /* BBD|ECC|ID */ 665 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 666 /* ECC|MC|MARK */ 667 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 668 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 669 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 670 /* MC|ID|ABRT|TRK0|MARK */ 671 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 672 /* MCR|MARK */ 673 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 674 /* Bad address mark */ 675 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 676 /* TRK0 */ 677 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 678 /* Abort & !ICRC */ 679 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 680 /* Media change request */ 681 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 682 /* SRV */ 683 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 684 /* Media change */ 685 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 686 /* ECC */ 687 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 688 /* BBD - block marked bad */ 689 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 690 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 691 }; 692 static const unsigned char stat_table[][4] = { 693 /* Must be first because BUSY means no other bits valid */ 694 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 695 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 696 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 697 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 698 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 699 }; 700 701 /* 702 * Is this an error we can process/parse 703 */ 704 if (drv_stat & ATA_BUSY) { 705 drv_err = 0; /* Ignore the err bits, they're invalid */ 706 } 707 708 if (drv_err) { 709 /* Look for drv_err */ 710 for (i = 0; sense_table[i][0] != 0xFF; i++) { 711 /* Look for best matches first */ 712 if ((sense_table[i][0] & drv_err) == 713 sense_table[i][0]) { 714 *sk = sense_table[i][1]; 715 *asc = sense_table[i][2]; 716 *ascq = sense_table[i][3]; 717 goto translate_done; 718 } 719 } 720 /* No immediate match */ 721 if (verbose) 722 printk(KERN_WARNING "ata%u: no sense translation for " 723 "error 0x%02x\n", id, drv_err); 724 } 725 726 /* Fall back to interpreting status bits */ 727 for (i = 0; stat_table[i][0] != 0xFF; i++) { 728 if (stat_table[i][0] & drv_stat) { 729 *sk = stat_table[i][1]; 730 *asc = stat_table[i][2]; 731 *ascq = stat_table[i][3]; 732 goto translate_done; 733 } 734 } 735 /* No error? Undecoded? */ 736 if (verbose) 737 printk(KERN_WARNING "ata%u: no sense translation for " 738 "status: 0x%02x\n", id, drv_stat); 739 740 /* We need a sensible error return here, which is tricky, and one 741 that won't cause people to do things like return a disk wrongly */ 742 *sk = ABORTED_COMMAND; 743 *asc = 0x00; 744 *ascq = 0x00; 745 746 translate_done: 747 if (verbose) 748 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 749 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 750 id, drv_stat, drv_err, *sk, *asc, *ascq); 751 return; 752 } 753 754 /* 755 * ata_gen_passthru_sense - Generate check condition sense block. 756 * @qc: Command that completed. 757 * 758 * This function is specific to the ATA descriptor format sense 759 * block specified for the ATA pass through commands. Regardless 760 * of whether the command errored or not, return a sense 761 * block. Copy all controller registers into the sense 762 * block. Clear sense key, ASC & ASCQ if there is no error. 763 * 764 * LOCKING: 765 * None. 766 */ 767 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 768 { 769 struct scsi_cmnd *cmd = qc->scsicmd; 770 struct ata_taskfile *tf = &qc->result_tf; 771 unsigned char *sb = cmd->sense_buffer; 772 unsigned char *desc = sb + 8; 773 int verbose = qc->ap->ops->error_handler == NULL; 774 775 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 776 777 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 778 779 /* 780 * Use ata_to_sense_error() to map status register bits 781 * onto sense key, asc & ascq. 782 */ 783 if (qc->err_mask || 784 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 785 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 786 &sb[1], &sb[2], &sb[3], verbose); 787 sb[1] &= 0x0f; 788 } 789 790 /* 791 * Sense data is current and format is descriptor. 792 */ 793 sb[0] = 0x72; 794 795 desc[0] = 0x09; 796 797 /* set length of additional sense data */ 798 sb[7] = 14; 799 desc[1] = 12; 800 801 /* 802 * Copy registers into sense buffer. 803 */ 804 desc[2] = 0x00; 805 desc[3] = tf->feature; /* == error reg */ 806 desc[5] = tf->nsect; 807 desc[7] = tf->lbal; 808 desc[9] = tf->lbam; 809 desc[11] = tf->lbah; 810 desc[12] = tf->device; 811 desc[13] = tf->command; /* == status reg */ 812 813 /* 814 * Fill in Extend bit, and the high order bytes 815 * if applicable. 816 */ 817 if (tf->flags & ATA_TFLAG_LBA48) { 818 desc[2] |= 0x01; 819 desc[4] = tf->hob_nsect; 820 desc[6] = tf->hob_lbal; 821 desc[8] = tf->hob_lbam; 822 desc[10] = tf->hob_lbah; 823 } 824 } 825 826 /** 827 * ata_gen_ata_sense - generate a SCSI fixed sense block 828 * @qc: Command that we are erroring out 829 * 830 * Generate sense block for a failed ATA command @qc. Descriptor 831 * format is used to accomodate LBA48 block address. 832 * 833 * LOCKING: 834 * None. 835 */ 836 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 837 { 838 struct ata_device *dev = qc->dev; 839 struct scsi_cmnd *cmd = qc->scsicmd; 840 struct ata_taskfile *tf = &qc->result_tf; 841 unsigned char *sb = cmd->sense_buffer; 842 unsigned char *desc = sb + 8; 843 int verbose = qc->ap->ops->error_handler == NULL; 844 u64 block; 845 846 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 847 848 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 849 850 /* sense data is current and format is descriptor */ 851 sb[0] = 0x72; 852 853 /* Use ata_to_sense_error() to map status register bits 854 * onto sense key, asc & ascq. 855 */ 856 if (qc->err_mask || 857 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 858 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 859 &sb[1], &sb[2], &sb[3], verbose); 860 sb[1] &= 0x0f; 861 } 862 863 block = ata_tf_read_block(&qc->result_tf, dev); 864 865 /* information sense data descriptor */ 866 sb[7] = 12; 867 desc[0] = 0x00; 868 desc[1] = 10; 869 870 desc[2] |= 0x80; /* valid */ 871 desc[6] = block >> 40; 872 desc[7] = block >> 32; 873 desc[8] = block >> 24; 874 desc[9] = block >> 16; 875 desc[10] = block >> 8; 876 desc[11] = block; 877 } 878 879 static void ata_scsi_sdev_config(struct scsi_device *sdev) 880 { 881 sdev->use_10_for_rw = 1; 882 sdev->use_10_for_ms = 1; 883 } 884 885 static void ata_scsi_dev_config(struct scsi_device *sdev, 886 struct ata_device *dev) 887 { 888 /* configure max sectors */ 889 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); 890 891 /* SATA DMA transfers must be multiples of 4 byte, so 892 * we need to pad ATAPI transfers using an extra sg. 893 * Decrement max hw segments accordingly. 894 */ 895 if (dev->class == ATA_DEV_ATAPI) { 896 request_queue_t *q = sdev->request_queue; 897 blk_queue_max_hw_segments(q, q->max_hw_segments - 1); 898 } 899 900 if (dev->flags & ATA_DFLAG_NCQ) { 901 int depth; 902 903 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 904 depth = min(ATA_MAX_QUEUE - 1, depth); 905 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 906 } 907 } 908 909 /** 910 * ata_scsi_slave_config - Set SCSI device attributes 911 * @sdev: SCSI device to examine 912 * 913 * This is called before we actually start reading 914 * and writing to the device, to configure certain 915 * SCSI mid-layer behaviors. 916 * 917 * LOCKING: 918 * Defined by SCSI layer. We don't really care. 919 */ 920 921 int ata_scsi_slave_config(struct scsi_device *sdev) 922 { 923 struct ata_port *ap = ata_shost_to_port(sdev->host); 924 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 925 926 ata_scsi_sdev_config(sdev); 927 928 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD); 929 930 if (dev) 931 ata_scsi_dev_config(sdev, dev); 932 933 return 0; /* scsi layer doesn't check return value, sigh */ 934 } 935 936 /** 937 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 938 * @sdev: SCSI device to be destroyed 939 * 940 * @sdev is about to be destroyed for hot/warm unplugging. If 941 * this unplugging was initiated by libata as indicated by NULL 942 * dev->sdev, this function doesn't have to do anything. 943 * Otherwise, SCSI layer initiated warm-unplug is in progress. 944 * Clear dev->sdev, schedule the device for ATA detach and invoke 945 * EH. 946 * 947 * LOCKING: 948 * Defined by SCSI layer. We don't really care. 949 */ 950 void ata_scsi_slave_destroy(struct scsi_device *sdev) 951 { 952 struct ata_port *ap = ata_shost_to_port(sdev->host); 953 unsigned long flags; 954 struct ata_device *dev; 955 956 if (!ap->ops->error_handler) 957 return; 958 959 spin_lock_irqsave(ap->lock, flags); 960 dev = __ata_scsi_find_dev(ap, sdev); 961 if (dev && dev->sdev) { 962 /* SCSI device already in CANCEL state, no need to offline it */ 963 dev->sdev = NULL; 964 dev->flags |= ATA_DFLAG_DETACH; 965 ata_port_schedule_eh(ap); 966 } 967 spin_unlock_irqrestore(ap->lock, flags); 968 } 969 970 /** 971 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 972 * @sdev: SCSI device to configure queue depth for 973 * @queue_depth: new queue depth 974 * 975 * This is libata standard hostt->change_queue_depth callback. 976 * SCSI will call into this callback when user tries to set queue 977 * depth via sysfs. 978 * 979 * LOCKING: 980 * SCSI layer (we don't care) 981 * 982 * RETURNS: 983 * Newly configured queue depth. 984 */ 985 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 986 { 987 struct ata_port *ap = ata_shost_to_port(sdev->host); 988 struct ata_device *dev; 989 unsigned long flags; 990 991 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 992 return sdev->queue_depth; 993 994 dev = ata_scsi_find_dev(ap, sdev); 995 if (!dev || !ata_dev_enabled(dev)) 996 return sdev->queue_depth; 997 998 /* NCQ enabled? */ 999 spin_lock_irqsave(ap->lock, flags); 1000 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1001 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1002 dev->flags |= ATA_DFLAG_NCQ_OFF; 1003 queue_depth = 1; 1004 } 1005 spin_unlock_irqrestore(ap->lock, flags); 1006 1007 /* limit and apply queue depth */ 1008 queue_depth = min(queue_depth, sdev->host->can_queue); 1009 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1010 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1011 1012 if (sdev->queue_depth == queue_depth) 1013 return -EINVAL; 1014 1015 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1016 return queue_depth; 1017 } 1018 1019 /** 1020 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1021 * @qc: Storage for translated ATA taskfile 1022 * 1023 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1024 * (to start). Perhaps these commands should be preceded by 1025 * CHECK POWER MODE to see what power mode the device is already in. 1026 * [See SAT revision 5 at www.t10.org] 1027 * 1028 * LOCKING: 1029 * spin_lock_irqsave(host lock) 1030 * 1031 * RETURNS: 1032 * Zero on success, non-zero on error. 1033 */ 1034 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1035 { 1036 struct scsi_cmnd *scmd = qc->scsicmd; 1037 struct ata_taskfile *tf = &qc->tf; 1038 const u8 *cdb = scmd->cmnd; 1039 1040 if (scmd->cmd_len < 5) 1041 goto invalid_fld; 1042 1043 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1044 tf->protocol = ATA_PROT_NODATA; 1045 if (cdb[1] & 0x1) { 1046 ; /* ignore IMMED bit, violates sat-r05 */ 1047 } 1048 if (cdb[4] & 0x2) 1049 goto invalid_fld; /* LOEJ bit set not supported */ 1050 if (((cdb[4] >> 4) & 0xf) != 0) 1051 goto invalid_fld; /* power conditions not supported */ 1052 if (cdb[4] & 0x1) { 1053 tf->nsect = 1; /* 1 sector, lba=0 */ 1054 1055 if (qc->dev->flags & ATA_DFLAG_LBA) { 1056 tf->flags |= ATA_TFLAG_LBA; 1057 1058 tf->lbah = 0x0; 1059 tf->lbam = 0x0; 1060 tf->lbal = 0x0; 1061 tf->device |= ATA_LBA; 1062 } else { 1063 /* CHS */ 1064 tf->lbal = 0x1; /* sect */ 1065 tf->lbam = 0x0; /* cyl low */ 1066 tf->lbah = 0x0; /* cyl high */ 1067 } 1068 1069 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1070 } else 1071 /* Issue ATA STANDBY IMMEDIATE command */ 1072 tf->command = ATA_CMD_STANDBYNOW1; 1073 1074 /* 1075 * Standby and Idle condition timers could be implemented but that 1076 * would require libata to implement the Power condition mode page 1077 * and allow the user to change it. Changing mode pages requires 1078 * MODE SELECT to be implemented. 1079 */ 1080 1081 return 0; 1082 1083 invalid_fld: 1084 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1085 /* "Invalid field in cbd" */ 1086 return 1; 1087 } 1088 1089 1090 /** 1091 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1092 * @qc: Storage for translated ATA taskfile 1093 * 1094 * Sets up an ATA taskfile to issue FLUSH CACHE or 1095 * FLUSH CACHE EXT. 1096 * 1097 * LOCKING: 1098 * spin_lock_irqsave(host lock) 1099 * 1100 * RETURNS: 1101 * Zero on success, non-zero on error. 1102 */ 1103 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1104 { 1105 struct ata_taskfile *tf = &qc->tf; 1106 1107 tf->flags |= ATA_TFLAG_DEVICE; 1108 tf->protocol = ATA_PROT_NODATA; 1109 1110 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1111 tf->command = ATA_CMD_FLUSH_EXT; 1112 else 1113 tf->command = ATA_CMD_FLUSH; 1114 1115 return 0; 1116 } 1117 1118 /** 1119 * scsi_6_lba_len - Get LBA and transfer length 1120 * @cdb: SCSI command to translate 1121 * 1122 * Calculate LBA and transfer length for 6-byte commands. 1123 * 1124 * RETURNS: 1125 * @plba: the LBA 1126 * @plen: the transfer length 1127 */ 1128 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1129 { 1130 u64 lba = 0; 1131 u32 len = 0; 1132 1133 VPRINTK("six-byte command\n"); 1134 1135 lba |= ((u64)cdb[2]) << 8; 1136 lba |= ((u64)cdb[3]); 1137 1138 len |= ((u32)cdb[4]); 1139 1140 *plba = lba; 1141 *plen = len; 1142 } 1143 1144 /** 1145 * scsi_10_lba_len - Get LBA and transfer length 1146 * @cdb: SCSI command to translate 1147 * 1148 * Calculate LBA and transfer length for 10-byte commands. 1149 * 1150 * RETURNS: 1151 * @plba: the LBA 1152 * @plen: the transfer length 1153 */ 1154 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1155 { 1156 u64 lba = 0; 1157 u32 len = 0; 1158 1159 VPRINTK("ten-byte command\n"); 1160 1161 lba |= ((u64)cdb[2]) << 24; 1162 lba |= ((u64)cdb[3]) << 16; 1163 lba |= ((u64)cdb[4]) << 8; 1164 lba |= ((u64)cdb[5]); 1165 1166 len |= ((u32)cdb[7]) << 8; 1167 len |= ((u32)cdb[8]); 1168 1169 *plba = lba; 1170 *plen = len; 1171 } 1172 1173 /** 1174 * scsi_16_lba_len - Get LBA and transfer length 1175 * @cdb: SCSI command to translate 1176 * 1177 * Calculate LBA and transfer length for 16-byte commands. 1178 * 1179 * RETURNS: 1180 * @plba: the LBA 1181 * @plen: the transfer length 1182 */ 1183 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1184 { 1185 u64 lba = 0; 1186 u32 len = 0; 1187 1188 VPRINTK("sixteen-byte command\n"); 1189 1190 lba |= ((u64)cdb[2]) << 56; 1191 lba |= ((u64)cdb[3]) << 48; 1192 lba |= ((u64)cdb[4]) << 40; 1193 lba |= ((u64)cdb[5]) << 32; 1194 lba |= ((u64)cdb[6]) << 24; 1195 lba |= ((u64)cdb[7]) << 16; 1196 lba |= ((u64)cdb[8]) << 8; 1197 lba |= ((u64)cdb[9]); 1198 1199 len |= ((u32)cdb[10]) << 24; 1200 len |= ((u32)cdb[11]) << 16; 1201 len |= ((u32)cdb[12]) << 8; 1202 len |= ((u32)cdb[13]); 1203 1204 *plba = lba; 1205 *plen = len; 1206 } 1207 1208 /** 1209 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1210 * @qc: Storage for translated ATA taskfile 1211 * 1212 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1213 * 1214 * LOCKING: 1215 * spin_lock_irqsave(host lock) 1216 * 1217 * RETURNS: 1218 * Zero on success, non-zero on error. 1219 */ 1220 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1221 { 1222 struct scsi_cmnd *scmd = qc->scsicmd; 1223 struct ata_taskfile *tf = &qc->tf; 1224 struct ata_device *dev = qc->dev; 1225 u64 dev_sectors = qc->dev->n_sectors; 1226 const u8 *cdb = scmd->cmnd; 1227 u64 block; 1228 u32 n_block; 1229 1230 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1231 tf->protocol = ATA_PROT_NODATA; 1232 1233 if (cdb[0] == VERIFY) { 1234 if (scmd->cmd_len < 10) 1235 goto invalid_fld; 1236 scsi_10_lba_len(cdb, &block, &n_block); 1237 } else if (cdb[0] == VERIFY_16) { 1238 if (scmd->cmd_len < 16) 1239 goto invalid_fld; 1240 scsi_16_lba_len(cdb, &block, &n_block); 1241 } else 1242 goto invalid_fld; 1243 1244 if (!n_block) 1245 goto nothing_to_do; 1246 if (block >= dev_sectors) 1247 goto out_of_range; 1248 if ((block + n_block) > dev_sectors) 1249 goto out_of_range; 1250 1251 if (dev->flags & ATA_DFLAG_LBA) { 1252 tf->flags |= ATA_TFLAG_LBA; 1253 1254 if (lba_28_ok(block, n_block)) { 1255 /* use LBA28 */ 1256 tf->command = ATA_CMD_VERIFY; 1257 tf->device |= (block >> 24) & 0xf; 1258 } else if (lba_48_ok(block, n_block)) { 1259 if (!(dev->flags & ATA_DFLAG_LBA48)) 1260 goto out_of_range; 1261 1262 /* use LBA48 */ 1263 tf->flags |= ATA_TFLAG_LBA48; 1264 tf->command = ATA_CMD_VERIFY_EXT; 1265 1266 tf->hob_nsect = (n_block >> 8) & 0xff; 1267 1268 tf->hob_lbah = (block >> 40) & 0xff; 1269 tf->hob_lbam = (block >> 32) & 0xff; 1270 tf->hob_lbal = (block >> 24) & 0xff; 1271 } else 1272 /* request too large even for LBA48 */ 1273 goto out_of_range; 1274 1275 tf->nsect = n_block & 0xff; 1276 1277 tf->lbah = (block >> 16) & 0xff; 1278 tf->lbam = (block >> 8) & 0xff; 1279 tf->lbal = block & 0xff; 1280 1281 tf->device |= ATA_LBA; 1282 } else { 1283 /* CHS */ 1284 u32 sect, head, cyl, track; 1285 1286 if (!lba_28_ok(block, n_block)) 1287 goto out_of_range; 1288 1289 /* Convert LBA to CHS */ 1290 track = (u32)block / dev->sectors; 1291 cyl = track / dev->heads; 1292 head = track % dev->heads; 1293 sect = (u32)block % dev->sectors + 1; 1294 1295 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1296 (u32)block, track, cyl, head, sect); 1297 1298 /* Check whether the converted CHS can fit. 1299 Cylinder: 0-65535 1300 Head: 0-15 1301 Sector: 1-255*/ 1302 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1303 goto out_of_range; 1304 1305 tf->command = ATA_CMD_VERIFY; 1306 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1307 tf->lbal = sect; 1308 tf->lbam = cyl; 1309 tf->lbah = cyl >> 8; 1310 tf->device |= head; 1311 } 1312 1313 return 0; 1314 1315 invalid_fld: 1316 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1317 /* "Invalid field in cbd" */ 1318 return 1; 1319 1320 out_of_range: 1321 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1322 /* "Logical Block Address out of range" */ 1323 return 1; 1324 1325 nothing_to_do: 1326 scmd->result = SAM_STAT_GOOD; 1327 return 1; 1328 } 1329 1330 /** 1331 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1332 * @qc: Storage for translated ATA taskfile 1333 * 1334 * Converts any of six SCSI read/write commands into the 1335 * ATA counterpart, including starting sector (LBA), 1336 * sector count, and taking into account the device's LBA48 1337 * support. 1338 * 1339 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1340 * %WRITE_16 are currently supported. 1341 * 1342 * LOCKING: 1343 * spin_lock_irqsave(host lock) 1344 * 1345 * RETURNS: 1346 * Zero on success, non-zero on error. 1347 */ 1348 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1349 { 1350 struct scsi_cmnd *scmd = qc->scsicmd; 1351 const u8 *cdb = scmd->cmnd; 1352 unsigned int tf_flags = 0; 1353 u64 block; 1354 u32 n_block; 1355 int rc; 1356 1357 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1358 tf_flags |= ATA_TFLAG_WRITE; 1359 1360 /* Calculate the SCSI LBA, transfer length and FUA. */ 1361 switch (cdb[0]) { 1362 case READ_10: 1363 case WRITE_10: 1364 if (unlikely(scmd->cmd_len < 10)) 1365 goto invalid_fld; 1366 scsi_10_lba_len(cdb, &block, &n_block); 1367 if (unlikely(cdb[1] & (1 << 3))) 1368 tf_flags |= ATA_TFLAG_FUA; 1369 break; 1370 case READ_6: 1371 case WRITE_6: 1372 if (unlikely(scmd->cmd_len < 6)) 1373 goto invalid_fld; 1374 scsi_6_lba_len(cdb, &block, &n_block); 1375 1376 /* for 6-byte r/w commands, transfer length 0 1377 * means 256 blocks of data, not 0 block. 1378 */ 1379 if (!n_block) 1380 n_block = 256; 1381 break; 1382 case READ_16: 1383 case WRITE_16: 1384 if (unlikely(scmd->cmd_len < 16)) 1385 goto invalid_fld; 1386 scsi_16_lba_len(cdb, &block, &n_block); 1387 if (unlikely(cdb[1] & (1 << 3))) 1388 tf_flags |= ATA_TFLAG_FUA; 1389 break; 1390 default: 1391 DPRINTK("no-byte command\n"); 1392 goto invalid_fld; 1393 } 1394 1395 /* Check and compose ATA command */ 1396 if (!n_block) 1397 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1398 * length 0 means transfer 0 block of data. 1399 * However, for ATA R/W commands, sector count 0 means 1400 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1401 * 1402 * WARNING: one or two older ATA drives treat 0 as 0... 1403 */ 1404 goto nothing_to_do; 1405 1406 qc->flags |= ATA_QCFLAG_IO; 1407 qc->nbytes = n_block * ATA_SECT_SIZE; 1408 1409 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1410 qc->tag); 1411 if (likely(rc == 0)) 1412 return 0; 1413 1414 if (rc == -ERANGE) 1415 goto out_of_range; 1416 /* treat all other errors as -EINVAL, fall through */ 1417 invalid_fld: 1418 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1419 /* "Invalid field in cbd" */ 1420 return 1; 1421 1422 out_of_range: 1423 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1424 /* "Logical Block Address out of range" */ 1425 return 1; 1426 1427 nothing_to_do: 1428 scmd->result = SAM_STAT_GOOD; 1429 return 1; 1430 } 1431 1432 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1433 { 1434 struct ata_port *ap = qc->ap; 1435 struct scsi_cmnd *cmd = qc->scsicmd; 1436 u8 *cdb = cmd->cmnd; 1437 int need_sense = (qc->err_mask != 0); 1438 1439 /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and 1440 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE 1441 * cache 1442 */ 1443 if (ap->ops->error_handler && 1444 !need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) && 1445 ((qc->tf.feature == SETFEATURES_WC_ON) || 1446 (qc->tf.feature == SETFEATURES_WC_OFF))) { 1447 ap->eh_info.action |= ATA_EH_REVALIDATE; 1448 ata_port_schedule_eh(ap); 1449 } 1450 1451 /* For ATA pass thru (SAT) commands, generate a sense block if 1452 * user mandated it or if there's an error. Note that if we 1453 * generate because the user forced us to, a check condition 1454 * is generated and the ATA register values are returned 1455 * whether the command completed successfully or not. If there 1456 * was no error, SK, ASC and ASCQ will all be zero. 1457 */ 1458 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1459 ((cdb[2] & 0x20) || need_sense)) { 1460 ata_gen_passthru_sense(qc); 1461 } else { 1462 if (!need_sense) { 1463 cmd->result = SAM_STAT_GOOD; 1464 } else { 1465 /* TODO: decide which descriptor format to use 1466 * for 48b LBA devices and call that here 1467 * instead of the fixed desc, which is only 1468 * good for smaller LBA (and maybe CHS?) 1469 * devices. 1470 */ 1471 ata_gen_ata_sense(qc); 1472 } 1473 } 1474 1475 if (need_sense && !ap->ops->error_handler) 1476 ata_dump_status(ap->print_id, &qc->result_tf); 1477 1478 qc->scsidone(cmd); 1479 1480 ata_qc_free(qc); 1481 } 1482 1483 /** 1484 * ata_scmd_need_defer - Check whether we need to defer scmd 1485 * @dev: ATA device to which the command is addressed 1486 * @is_io: Is the command IO (and thus possibly NCQ)? 1487 * 1488 * NCQ and non-NCQ commands cannot run together. As upper layer 1489 * only knows the queue depth, we are responsible for maintaining 1490 * exclusion. This function checks whether a new command can be 1491 * issued to @dev. 1492 * 1493 * LOCKING: 1494 * spin_lock_irqsave(host lock) 1495 * 1496 * RETURNS: 1497 * 1 if deferring is needed, 0 otherwise. 1498 */ 1499 static int ata_scmd_need_defer(struct ata_device *dev, int is_io) 1500 { 1501 struct ata_port *ap = dev->ap; 1502 int is_ncq = is_io && ata_ncq_enabled(dev); 1503 1504 if (is_ncq) { 1505 if (!ata_tag_valid(ap->active_tag)) 1506 return 0; 1507 } else { 1508 if (!ata_tag_valid(ap->active_tag) && !ap->sactive) 1509 return 0; 1510 } 1511 return 1; 1512 } 1513 1514 /** 1515 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1516 * @dev: ATA device to which the command is addressed 1517 * @cmd: SCSI command to execute 1518 * @done: SCSI command completion function 1519 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1520 * 1521 * Our ->queuecommand() function has decided that the SCSI 1522 * command issued can be directly translated into an ATA 1523 * command, rather than handled internally. 1524 * 1525 * This function sets up an ata_queued_cmd structure for the 1526 * SCSI command, and sends that ata_queued_cmd to the hardware. 1527 * 1528 * The xlat_func argument (actor) returns 0 if ready to execute 1529 * ATA command, else 1 to finish translation. If 1 is returned 1530 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1531 * to be set reflecting an error condition or clean (early) 1532 * termination. 1533 * 1534 * LOCKING: 1535 * spin_lock_irqsave(host lock) 1536 * 1537 * RETURNS: 1538 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1539 * needs to be deferred. 1540 */ 1541 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1542 void (*done)(struct scsi_cmnd *), 1543 ata_xlat_func_t xlat_func) 1544 { 1545 struct ata_queued_cmd *qc; 1546 int is_io = xlat_func == ata_scsi_rw_xlat; 1547 1548 VPRINTK("ENTER\n"); 1549 1550 if (unlikely(ata_scmd_need_defer(dev, is_io))) 1551 goto defer; 1552 1553 qc = ata_scsi_qc_new(dev, cmd, done); 1554 if (!qc) 1555 goto err_mem; 1556 1557 /* data is present; dma-map it */ 1558 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1559 cmd->sc_data_direction == DMA_TO_DEVICE) { 1560 if (unlikely(cmd->request_bufflen < 1)) { 1561 ata_dev_printk(dev, KERN_WARNING, 1562 "WARNING: zero len r/w req\n"); 1563 goto err_did; 1564 } 1565 1566 if (cmd->use_sg) 1567 ata_sg_init(qc, cmd->request_buffer, cmd->use_sg); 1568 else 1569 ata_sg_init_one(qc, cmd->request_buffer, 1570 cmd->request_bufflen); 1571 1572 qc->dma_dir = cmd->sc_data_direction; 1573 } 1574 1575 qc->complete_fn = ata_scsi_qc_complete; 1576 1577 if (xlat_func(qc)) 1578 goto early_finish; 1579 1580 /* select device, send command to hardware */ 1581 ata_qc_issue(qc); 1582 1583 VPRINTK("EXIT\n"); 1584 return 0; 1585 1586 early_finish: 1587 ata_qc_free(qc); 1588 done(cmd); 1589 DPRINTK("EXIT - early finish (good or error)\n"); 1590 return 0; 1591 1592 err_did: 1593 ata_qc_free(qc); 1594 cmd->result = (DID_ERROR << 16); 1595 done(cmd); 1596 err_mem: 1597 DPRINTK("EXIT - internal\n"); 1598 return 0; 1599 1600 defer: 1601 DPRINTK("EXIT - defer\n"); 1602 return SCSI_MLQUEUE_DEVICE_BUSY; 1603 } 1604 1605 /** 1606 * ata_scsi_rbuf_get - Map response buffer. 1607 * @cmd: SCSI command containing buffer to be mapped. 1608 * @buf_out: Pointer to mapped area. 1609 * 1610 * Maps buffer contained within SCSI command @cmd. 1611 * 1612 * LOCKING: 1613 * spin_lock_irqsave(host lock) 1614 * 1615 * RETURNS: 1616 * Length of response buffer. 1617 */ 1618 1619 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out) 1620 { 1621 u8 *buf; 1622 unsigned int buflen; 1623 1624 if (cmd->use_sg) { 1625 struct scatterlist *sg; 1626 1627 sg = (struct scatterlist *) cmd->request_buffer; 1628 buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset; 1629 buflen = sg->length; 1630 } else { 1631 buf = cmd->request_buffer; 1632 buflen = cmd->request_bufflen; 1633 } 1634 1635 *buf_out = buf; 1636 return buflen; 1637 } 1638 1639 /** 1640 * ata_scsi_rbuf_put - Unmap response buffer. 1641 * @cmd: SCSI command containing buffer to be unmapped. 1642 * @buf: buffer to unmap 1643 * 1644 * Unmaps response buffer contained within @cmd. 1645 * 1646 * LOCKING: 1647 * spin_lock_irqsave(host lock) 1648 */ 1649 1650 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf) 1651 { 1652 if (cmd->use_sg) { 1653 struct scatterlist *sg; 1654 1655 sg = (struct scatterlist *) cmd->request_buffer; 1656 kunmap_atomic(buf - sg->offset, KM_IRQ0); 1657 } 1658 } 1659 1660 /** 1661 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1662 * @args: device IDENTIFY data / SCSI command of interest. 1663 * @actor: Callback hook for desired SCSI command simulator 1664 * 1665 * Takes care of the hard work of simulating a SCSI command... 1666 * Mapping the response buffer, calling the command's handler, 1667 * and handling the handler's return value. This return value 1668 * indicates whether the handler wishes the SCSI command to be 1669 * completed successfully (0), or not (in which case cmd->result 1670 * and sense buffer are assumed to be set). 1671 * 1672 * LOCKING: 1673 * spin_lock_irqsave(host lock) 1674 */ 1675 1676 void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1677 unsigned int (*actor) (struct ata_scsi_args *args, 1678 u8 *rbuf, unsigned int buflen)) 1679 { 1680 u8 *rbuf; 1681 unsigned int buflen, rc; 1682 struct scsi_cmnd *cmd = args->cmd; 1683 1684 buflen = ata_scsi_rbuf_get(cmd, &rbuf); 1685 memset(rbuf, 0, buflen); 1686 rc = actor(args, rbuf, buflen); 1687 ata_scsi_rbuf_put(cmd, rbuf); 1688 1689 if (rc == 0) 1690 cmd->result = SAM_STAT_GOOD; 1691 args->done(cmd); 1692 } 1693 1694 /** 1695 * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer 1696 * @idx: byte index into SCSI response buffer 1697 * @val: value to set 1698 * 1699 * To be used by SCSI command simulator functions. This macros 1700 * expects two local variables, u8 *rbuf and unsigned int buflen, 1701 * are in scope. 1702 * 1703 * LOCKING: 1704 * None. 1705 */ 1706 #define ATA_SCSI_RBUF_SET(idx, val) do { \ 1707 if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \ 1708 } while (0) 1709 1710 /** 1711 * ata_scsiop_inq_std - Simulate INQUIRY command 1712 * @args: device IDENTIFY data / SCSI command of interest. 1713 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1714 * @buflen: Response buffer length. 1715 * 1716 * Returns standard device identification data associated 1717 * with non-VPD INQUIRY command output. 1718 * 1719 * LOCKING: 1720 * spin_lock_irqsave(host lock) 1721 */ 1722 1723 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf, 1724 unsigned int buflen) 1725 { 1726 u8 hdr[] = { 1727 TYPE_DISK, 1728 0, 1729 0x5, /* claim SPC-3 version compatibility */ 1730 2, 1731 95 - 4 1732 }; 1733 1734 /* set scsi removeable (RMB) bit per ata bit */ 1735 if (ata_id_removeable(args->id)) 1736 hdr[1] |= (1 << 7); 1737 1738 VPRINTK("ENTER\n"); 1739 1740 memcpy(rbuf, hdr, sizeof(hdr)); 1741 1742 if (buflen > 35) { 1743 memcpy(&rbuf[8], "ATA ", 8); 1744 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1745 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1746 if (rbuf[32] == 0 || rbuf[32] == ' ') 1747 memcpy(&rbuf[32], "n/a ", 4); 1748 } 1749 1750 if (buflen > 63) { 1751 const u8 versions[] = { 1752 0x60, /* SAM-3 (no version claimed) */ 1753 1754 0x03, 1755 0x20, /* SBC-2 (no version claimed) */ 1756 1757 0x02, 1758 0x60 /* SPC-3 (no version claimed) */ 1759 }; 1760 1761 memcpy(rbuf + 59, versions, sizeof(versions)); 1762 } 1763 1764 return 0; 1765 } 1766 1767 /** 1768 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1769 * @args: device IDENTIFY data / SCSI command of interest. 1770 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1771 * @buflen: Response buffer length. 1772 * 1773 * Returns list of inquiry VPD pages available. 1774 * 1775 * LOCKING: 1776 * spin_lock_irqsave(host lock) 1777 */ 1778 1779 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf, 1780 unsigned int buflen) 1781 { 1782 const u8 pages[] = { 1783 0x00, /* page 0x00, this page */ 1784 0x80, /* page 0x80, unit serial no page */ 1785 0x83 /* page 0x83, device ident page */ 1786 }; 1787 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 1788 1789 if (buflen > 6) 1790 memcpy(rbuf + 4, pages, sizeof(pages)); 1791 1792 return 0; 1793 } 1794 1795 /** 1796 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1797 * @args: device IDENTIFY data / SCSI command of interest. 1798 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1799 * @buflen: Response buffer length. 1800 * 1801 * Returns ATA device serial number. 1802 * 1803 * LOCKING: 1804 * spin_lock_irqsave(host lock) 1805 */ 1806 1807 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf, 1808 unsigned int buflen) 1809 { 1810 const u8 hdr[] = { 1811 0, 1812 0x80, /* this page code */ 1813 0, 1814 ATA_ID_SERNO_LEN, /* page len */ 1815 }; 1816 memcpy(rbuf, hdr, sizeof(hdr)); 1817 1818 if (buflen > (ATA_ID_SERNO_LEN + 4 - 1)) 1819 ata_id_string(args->id, (unsigned char *) &rbuf[4], 1820 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1821 1822 return 0; 1823 } 1824 1825 /** 1826 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 1827 * @args: device IDENTIFY data / SCSI command of interest. 1828 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1829 * @buflen: Response buffer length. 1830 * 1831 * Yields two logical unit device identification designators: 1832 * - vendor specific ASCII containing the ATA serial number 1833 * - SAT defined "t10 vendor id based" containing ASCII vendor 1834 * name ("ATA "), model and serial numbers. 1835 * 1836 * LOCKING: 1837 * spin_lock_irqsave(host lock) 1838 */ 1839 1840 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf, 1841 unsigned int buflen) 1842 { 1843 int num; 1844 const int sat_model_serial_desc_len = 68; 1845 1846 rbuf[1] = 0x83; /* this page code */ 1847 num = 4; 1848 1849 if (buflen > (ATA_ID_SERNO_LEN + num + 3)) { 1850 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 1851 rbuf[num + 0] = 2; 1852 rbuf[num + 3] = ATA_ID_SERNO_LEN; 1853 num += 4; 1854 ata_id_string(args->id, (unsigned char *) rbuf + num, 1855 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1856 num += ATA_ID_SERNO_LEN; 1857 } 1858 if (buflen > (sat_model_serial_desc_len + num + 3)) { 1859 /* SAT defined lu model and serial numbers descriptor */ 1860 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 1861 rbuf[num + 0] = 2; 1862 rbuf[num + 1] = 1; 1863 rbuf[num + 3] = sat_model_serial_desc_len; 1864 num += 4; 1865 memcpy(rbuf + num, "ATA ", 8); 1866 num += 8; 1867 ata_id_string(args->id, (unsigned char *) rbuf + num, 1868 ATA_ID_PROD, ATA_ID_PROD_LEN); 1869 num += ATA_ID_PROD_LEN; 1870 ata_id_string(args->id, (unsigned char *) rbuf + num, 1871 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1872 num += ATA_ID_SERNO_LEN; 1873 } 1874 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 1875 return 0; 1876 } 1877 1878 /** 1879 * ata_scsiop_noop - Command handler that simply returns success. 1880 * @args: device IDENTIFY data / SCSI command of interest. 1881 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1882 * @buflen: Response buffer length. 1883 * 1884 * No operation. Simply returns success to caller, to indicate 1885 * that the caller should successfully complete this SCSI command. 1886 * 1887 * LOCKING: 1888 * spin_lock_irqsave(host lock) 1889 */ 1890 1891 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf, 1892 unsigned int buflen) 1893 { 1894 VPRINTK("ENTER\n"); 1895 return 0; 1896 } 1897 1898 /** 1899 * ata_msense_push - Push data onto MODE SENSE data output buffer 1900 * @ptr_io: (input/output) Location to store more output data 1901 * @last: End of output data buffer 1902 * @buf: Pointer to BLOB being added to output buffer 1903 * @buflen: Length of BLOB 1904 * 1905 * Store MODE SENSE data on an output buffer. 1906 * 1907 * LOCKING: 1908 * None. 1909 */ 1910 1911 static void ata_msense_push(u8 **ptr_io, const u8 *last, 1912 const u8 *buf, unsigned int buflen) 1913 { 1914 u8 *ptr = *ptr_io; 1915 1916 if ((ptr + buflen - 1) > last) 1917 return; 1918 1919 memcpy(ptr, buf, buflen); 1920 1921 ptr += buflen; 1922 1923 *ptr_io = ptr; 1924 } 1925 1926 /** 1927 * ata_msense_caching - Simulate MODE SENSE caching info page 1928 * @id: device IDENTIFY data 1929 * @ptr_io: (input/output) Location to store more output data 1930 * @last: End of output data buffer 1931 * 1932 * Generate a caching info page, which conditionally indicates 1933 * write caching to the SCSI layer, depending on device 1934 * capabilities. 1935 * 1936 * LOCKING: 1937 * None. 1938 */ 1939 1940 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io, 1941 const u8 *last) 1942 { 1943 u8 page[CACHE_MPAGE_LEN]; 1944 1945 memcpy(page, def_cache_mpage, sizeof(page)); 1946 if (ata_id_wcache_enabled(id)) 1947 page[2] |= (1 << 2); /* write cache enable */ 1948 if (!ata_id_rahead_enabled(id)) 1949 page[12] |= (1 << 5); /* disable read ahead */ 1950 1951 ata_msense_push(ptr_io, last, page, sizeof(page)); 1952 return sizeof(page); 1953 } 1954 1955 /** 1956 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 1957 * @dev: Device associated with this MODE SENSE command 1958 * @ptr_io: (input/output) Location to store more output data 1959 * @last: End of output data buffer 1960 * 1961 * Generate a generic MODE SENSE control mode page. 1962 * 1963 * LOCKING: 1964 * None. 1965 */ 1966 1967 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last) 1968 { 1969 ata_msense_push(ptr_io, last, def_control_mpage, 1970 sizeof(def_control_mpage)); 1971 return sizeof(def_control_mpage); 1972 } 1973 1974 /** 1975 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 1976 * @dev: Device associated with this MODE SENSE command 1977 * @ptr_io: (input/output) Location to store more output data 1978 * @last: End of output data buffer 1979 * 1980 * Generate a generic MODE SENSE r/w error recovery page. 1981 * 1982 * LOCKING: 1983 * None. 1984 */ 1985 1986 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last) 1987 { 1988 1989 ata_msense_push(ptr_io, last, def_rw_recovery_mpage, 1990 sizeof(def_rw_recovery_mpage)); 1991 return sizeof(def_rw_recovery_mpage); 1992 } 1993 1994 /* 1995 * We can turn this into a real blacklist if it's needed, for now just 1996 * blacklist any Maxtor BANC1G10 revision firmware 1997 */ 1998 static int ata_dev_supports_fua(u16 *id) 1999 { 2000 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2001 2002 if (!libata_fua) 2003 return 0; 2004 if (!ata_id_has_fua(id)) 2005 return 0; 2006 2007 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2008 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2009 2010 if (strcmp(model, "Maxtor")) 2011 return 1; 2012 if (strcmp(fw, "BANC1G10")) 2013 return 1; 2014 2015 return 0; /* blacklisted */ 2016 } 2017 2018 /** 2019 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2020 * @args: device IDENTIFY data / SCSI command of interest. 2021 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2022 * @buflen: Response buffer length. 2023 * 2024 * Simulate MODE SENSE commands. Assume this is invoked for direct 2025 * access devices (e.g. disks) only. There should be no block 2026 * descriptor for other device types. 2027 * 2028 * LOCKING: 2029 * spin_lock_irqsave(host lock) 2030 */ 2031 2032 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf, 2033 unsigned int buflen) 2034 { 2035 struct ata_device *dev = args->dev; 2036 u8 *scsicmd = args->cmd->cmnd, *p, *last; 2037 const u8 sat_blk_desc[] = { 2038 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2039 0, 2040 0, 0x2, 0x0 /* block length: 512 bytes */ 2041 }; 2042 u8 pg, spg; 2043 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen; 2044 u8 dpofua; 2045 2046 VPRINTK("ENTER\n"); 2047 2048 six_byte = (scsicmd[0] == MODE_SENSE); 2049 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2050 /* 2051 * LLBA bit in msense(10) ignored (compliant) 2052 */ 2053 2054 page_control = scsicmd[2] >> 6; 2055 switch (page_control) { 2056 case 0: /* current */ 2057 break; /* supported */ 2058 case 3: /* saved */ 2059 goto saving_not_supp; 2060 case 1: /* changeable */ 2061 case 2: /* defaults */ 2062 default: 2063 goto invalid_fld; 2064 } 2065 2066 if (six_byte) { 2067 output_len = 4 + (ebd ? 8 : 0); 2068 alloc_len = scsicmd[4]; 2069 } else { 2070 output_len = 8 + (ebd ? 8 : 0); 2071 alloc_len = (scsicmd[7] << 8) + scsicmd[8]; 2072 } 2073 minlen = (alloc_len < buflen) ? alloc_len : buflen; 2074 2075 p = rbuf + output_len; 2076 last = rbuf + minlen - 1; 2077 2078 pg = scsicmd[2] & 0x3f; 2079 spg = scsicmd[3]; 2080 /* 2081 * No mode subpages supported (yet) but asking for _all_ 2082 * subpages may be valid 2083 */ 2084 if (spg && (spg != ALL_SUB_MPAGES)) 2085 goto invalid_fld; 2086 2087 switch(pg) { 2088 case RW_RECOVERY_MPAGE: 2089 output_len += ata_msense_rw_recovery(&p, last); 2090 break; 2091 2092 case CACHE_MPAGE: 2093 output_len += ata_msense_caching(args->id, &p, last); 2094 break; 2095 2096 case CONTROL_MPAGE: { 2097 output_len += ata_msense_ctl_mode(&p, last); 2098 break; 2099 } 2100 2101 case ALL_MPAGES: 2102 output_len += ata_msense_rw_recovery(&p, last); 2103 output_len += ata_msense_caching(args->id, &p, last); 2104 output_len += ata_msense_ctl_mode(&p, last); 2105 break; 2106 2107 default: /* invalid page code */ 2108 goto invalid_fld; 2109 } 2110 2111 if (minlen < 1) 2112 return 0; 2113 2114 dpofua = 0; 2115 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2116 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2117 dpofua = 1 << 4; 2118 2119 if (six_byte) { 2120 output_len--; 2121 rbuf[0] = output_len; 2122 if (minlen > 2) 2123 rbuf[2] |= dpofua; 2124 if (ebd) { 2125 if (minlen > 3) 2126 rbuf[3] = sizeof(sat_blk_desc); 2127 if (minlen > 11) 2128 memcpy(rbuf + 4, sat_blk_desc, 2129 sizeof(sat_blk_desc)); 2130 } 2131 } else { 2132 output_len -= 2; 2133 rbuf[0] = output_len >> 8; 2134 if (minlen > 1) 2135 rbuf[1] = output_len; 2136 if (minlen > 3) 2137 rbuf[3] |= dpofua; 2138 if (ebd) { 2139 if (minlen > 7) 2140 rbuf[7] = sizeof(sat_blk_desc); 2141 if (minlen > 15) 2142 memcpy(rbuf + 8, sat_blk_desc, 2143 sizeof(sat_blk_desc)); 2144 } 2145 } 2146 return 0; 2147 2148 invalid_fld: 2149 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2150 /* "Invalid field in cbd" */ 2151 return 1; 2152 2153 saving_not_supp: 2154 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2155 /* "Saving parameters not supported" */ 2156 return 1; 2157 } 2158 2159 /** 2160 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2161 * @args: device IDENTIFY data / SCSI command of interest. 2162 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2163 * @buflen: Response buffer length. 2164 * 2165 * Simulate READ CAPACITY commands. 2166 * 2167 * LOCKING: 2168 * None. 2169 */ 2170 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf, 2171 unsigned int buflen) 2172 { 2173 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */ 2174 2175 VPRINTK("ENTER\n"); 2176 2177 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2178 if (last_lba >= 0xffffffffULL) 2179 last_lba = 0xffffffff; 2180 2181 /* sector count, 32-bit */ 2182 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3)); 2183 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2)); 2184 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1)); 2185 ATA_SCSI_RBUF_SET(3, last_lba); 2186 2187 /* sector size */ 2188 ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8); 2189 ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE); 2190 } else { 2191 /* sector count, 64-bit */ 2192 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7)); 2193 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6)); 2194 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5)); 2195 ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4)); 2196 ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3)); 2197 ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2)); 2198 ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1)); 2199 ATA_SCSI_RBUF_SET(7, last_lba); 2200 2201 /* sector size */ 2202 ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8); 2203 ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE); 2204 } 2205 2206 return 0; 2207 } 2208 2209 /** 2210 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2211 * @args: device IDENTIFY data / SCSI command of interest. 2212 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2213 * @buflen: Response buffer length. 2214 * 2215 * Simulate REPORT LUNS command. 2216 * 2217 * LOCKING: 2218 * spin_lock_irqsave(host lock) 2219 */ 2220 2221 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf, 2222 unsigned int buflen) 2223 { 2224 VPRINTK("ENTER\n"); 2225 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2226 2227 return 0; 2228 } 2229 2230 /** 2231 * ata_scsi_set_sense - Set SCSI sense data and status 2232 * @cmd: SCSI request to be handled 2233 * @sk: SCSI-defined sense key 2234 * @asc: SCSI-defined additional sense code 2235 * @ascq: SCSI-defined additional sense code qualifier 2236 * 2237 * Helper function that builds a valid fixed format, current 2238 * response code and the given sense key (sk), additional sense 2239 * code (asc) and additional sense code qualifier (ascq) with 2240 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and 2241 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result . 2242 * 2243 * LOCKING: 2244 * Not required 2245 */ 2246 2247 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 2248 { 2249 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 2250 2251 cmd->sense_buffer[0] = 0x70; /* fixed format, current */ 2252 cmd->sense_buffer[2] = sk; 2253 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */ 2254 cmd->sense_buffer[12] = asc; 2255 cmd->sense_buffer[13] = ascq; 2256 } 2257 2258 /** 2259 * ata_scsi_badcmd - End a SCSI request with an error 2260 * @cmd: SCSI request to be handled 2261 * @done: SCSI command completion function 2262 * @asc: SCSI-defined additional sense code 2263 * @ascq: SCSI-defined additional sense code qualifier 2264 * 2265 * Helper function that completes a SCSI command with 2266 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST 2267 * and the specified additional sense codes. 2268 * 2269 * LOCKING: 2270 * spin_lock_irqsave(host lock) 2271 */ 2272 2273 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq) 2274 { 2275 DPRINTK("ENTER\n"); 2276 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq); 2277 2278 done(cmd); 2279 } 2280 2281 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2282 { 2283 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2284 /* FIXME: not quite right; we don't want the 2285 * translation of taskfile registers into 2286 * a sense descriptors, since that's only 2287 * correct for ATA, not ATAPI 2288 */ 2289 ata_gen_passthru_sense(qc); 2290 } 2291 2292 qc->scsidone(qc->scsicmd); 2293 ata_qc_free(qc); 2294 } 2295 2296 /* is it pointless to prefer PIO for "safety reasons"? */ 2297 static inline int ata_pio_use_silly(struct ata_port *ap) 2298 { 2299 return (ap->flags & ATA_FLAG_PIO_DMA); 2300 } 2301 2302 static void atapi_request_sense(struct ata_queued_cmd *qc) 2303 { 2304 struct ata_port *ap = qc->ap; 2305 struct scsi_cmnd *cmd = qc->scsicmd; 2306 2307 DPRINTK("ATAPI request sense\n"); 2308 2309 /* FIXME: is this needed? */ 2310 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer)); 2311 2312 ap->ops->tf_read(ap, &qc->tf); 2313 2314 /* fill these in, for the case where they are -not- overwritten */ 2315 cmd->sense_buffer[0] = 0x70; 2316 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2317 2318 ata_qc_reinit(qc); 2319 2320 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer)); 2321 qc->dma_dir = DMA_FROM_DEVICE; 2322 2323 memset(&qc->cdb, 0, qc->dev->cdb_len); 2324 qc->cdb[0] = REQUEST_SENSE; 2325 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2326 2327 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2328 qc->tf.command = ATA_CMD_PACKET; 2329 2330 if (ata_pio_use_silly(ap)) { 2331 qc->tf.protocol = ATA_PROT_ATAPI_DMA; 2332 qc->tf.feature |= ATAPI_PKT_DMA; 2333 } else { 2334 qc->tf.protocol = ATA_PROT_ATAPI; 2335 qc->tf.lbam = (8 * 1024) & 0xff; 2336 qc->tf.lbah = (8 * 1024) >> 8; 2337 } 2338 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2339 2340 qc->complete_fn = atapi_sense_complete; 2341 2342 ata_qc_issue(qc); 2343 2344 DPRINTK("EXIT\n"); 2345 } 2346 2347 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2348 { 2349 struct scsi_cmnd *cmd = qc->scsicmd; 2350 unsigned int err_mask = qc->err_mask; 2351 2352 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2353 2354 /* handle completion from new EH */ 2355 if (unlikely(qc->ap->ops->error_handler && 2356 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2357 2358 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2359 /* FIXME: not quite right; we don't want the 2360 * translation of taskfile registers into a 2361 * sense descriptors, since that's only 2362 * correct for ATA, not ATAPI 2363 */ 2364 ata_gen_passthru_sense(qc); 2365 } 2366 2367 /* SCSI EH automatically locks door if sdev->locked is 2368 * set. Sometimes door lock request continues to 2369 * fail, for example, when no media is present. This 2370 * creates a loop - SCSI EH issues door lock which 2371 * fails and gets invoked again to acquire sense data 2372 * for the failed command. 2373 * 2374 * If door lock fails, always clear sdev->locked to 2375 * avoid this infinite loop. 2376 */ 2377 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2378 qc->dev->sdev->locked = 0; 2379 2380 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2381 qc->scsidone(cmd); 2382 ata_qc_free(qc); 2383 return; 2384 } 2385 2386 /* successful completion or old EH failure path */ 2387 if (unlikely(err_mask & AC_ERR_DEV)) { 2388 cmd->result = SAM_STAT_CHECK_CONDITION; 2389 atapi_request_sense(qc); 2390 return; 2391 } else if (unlikely(err_mask)) { 2392 /* FIXME: not quite right; we don't want the 2393 * translation of taskfile registers into 2394 * a sense descriptors, since that's only 2395 * correct for ATA, not ATAPI 2396 */ 2397 ata_gen_passthru_sense(qc); 2398 } else { 2399 u8 *scsicmd = cmd->cmnd; 2400 2401 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2402 u8 *buf = NULL; 2403 unsigned int buflen; 2404 2405 buflen = ata_scsi_rbuf_get(cmd, &buf); 2406 2407 /* ATAPI devices typically report zero for their SCSI version, 2408 * and sometimes deviate from the spec WRT response data 2409 * format. If SCSI version is reported as zero like normal, 2410 * then we make the following fixups: 1) Fake MMC-5 version, 2411 * to indicate to the Linux scsi midlayer this is a modern 2412 * device. 2) Ensure response data format / ATAPI information 2413 * are always correct. 2414 */ 2415 if (buf[2] == 0) { 2416 buf[2] = 0x5; 2417 buf[3] = 0x32; 2418 } 2419 2420 ata_scsi_rbuf_put(cmd, buf); 2421 } 2422 2423 cmd->result = SAM_STAT_GOOD; 2424 } 2425 2426 qc->scsidone(cmd); 2427 ata_qc_free(qc); 2428 } 2429 /** 2430 * atapi_xlat - Initialize PACKET taskfile 2431 * @qc: command structure to be initialized 2432 * 2433 * LOCKING: 2434 * spin_lock_irqsave(host lock) 2435 * 2436 * RETURNS: 2437 * Zero on success, non-zero on failure. 2438 */ 2439 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2440 { 2441 struct scsi_cmnd *scmd = qc->scsicmd; 2442 struct ata_device *dev = qc->dev; 2443 int using_pio = (dev->flags & ATA_DFLAG_PIO); 2444 int nodata = (scmd->sc_data_direction == DMA_NONE); 2445 2446 if (!using_pio) 2447 /* Check whether ATAPI DMA is safe */ 2448 if (ata_check_atapi_dma(qc)) 2449 using_pio = 1; 2450 2451 memset(qc->cdb, 0, dev->cdb_len); 2452 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2453 2454 qc->complete_fn = atapi_qc_complete; 2455 2456 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2457 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2458 qc->tf.flags |= ATA_TFLAG_WRITE; 2459 DPRINTK("direction: write\n"); 2460 } 2461 2462 qc->tf.command = ATA_CMD_PACKET; 2463 2464 /* no data, or PIO data xfer */ 2465 if (using_pio || nodata) { 2466 if (nodata) 2467 qc->tf.protocol = ATA_PROT_ATAPI_NODATA; 2468 else 2469 qc->tf.protocol = ATA_PROT_ATAPI; 2470 qc->tf.lbam = (8 * 1024) & 0xff; 2471 qc->tf.lbah = (8 * 1024) >> 8; 2472 } 2473 2474 /* DMA data xfer */ 2475 else { 2476 qc->tf.protocol = ATA_PROT_ATAPI_DMA; 2477 qc->tf.feature |= ATAPI_PKT_DMA; 2478 2479 if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE)) 2480 /* some SATA bridges need us to indicate data xfer direction */ 2481 qc->tf.feature |= ATAPI_DMADIR; 2482 } 2483 2484 qc->nbytes = scmd->request_bufflen; 2485 2486 return 0; 2487 } 2488 2489 static struct ata_device * ata_find_dev(struct ata_port *ap, int id) 2490 { 2491 if (likely(id < ATA_MAX_DEVICES)) 2492 return &ap->device[id]; 2493 return NULL; 2494 } 2495 2496 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap, 2497 const struct scsi_device *scsidev) 2498 { 2499 /* skip commands not addressed to targets we simulate */ 2500 if (unlikely(scsidev->channel || scsidev->lun)) 2501 return NULL; 2502 2503 return ata_find_dev(ap, scsidev->id); 2504 } 2505 2506 /** 2507 * ata_scsi_dev_enabled - determine if device is enabled 2508 * @dev: ATA device 2509 * 2510 * Determine if commands should be sent to the specified device. 2511 * 2512 * LOCKING: 2513 * spin_lock_irqsave(host lock) 2514 * 2515 * RETURNS: 2516 * 0 if commands are not allowed / 1 if commands are allowed 2517 */ 2518 2519 static int ata_scsi_dev_enabled(struct ata_device *dev) 2520 { 2521 if (unlikely(!ata_dev_enabled(dev))) 2522 return 0; 2523 2524 if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) { 2525 if (unlikely(dev->class == ATA_DEV_ATAPI)) { 2526 ata_dev_printk(dev, KERN_WARNING, 2527 "WARNING: ATAPI is %s, device ignored.\n", 2528 atapi_enabled ? "not supported with this driver" : "disabled"); 2529 return 0; 2530 } 2531 } 2532 2533 return 1; 2534 } 2535 2536 /** 2537 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2538 * @ap: ATA port to which the device is attached 2539 * @scsidev: SCSI device from which we derive the ATA device 2540 * 2541 * Given various information provided in struct scsi_cmnd, 2542 * map that onto an ATA bus, and using that mapping 2543 * determine which ata_device is associated with the 2544 * SCSI command to be sent. 2545 * 2546 * LOCKING: 2547 * spin_lock_irqsave(host lock) 2548 * 2549 * RETURNS: 2550 * Associated ATA device, or %NULL if not found. 2551 */ 2552 static struct ata_device * 2553 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2554 { 2555 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2556 2557 if (unlikely(!dev || !ata_scsi_dev_enabled(dev))) 2558 return NULL; 2559 2560 return dev; 2561 } 2562 2563 /* 2564 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2565 * @byte1: Byte 1 from pass-thru CDB. 2566 * 2567 * RETURNS: 2568 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2569 */ 2570 static u8 2571 ata_scsi_map_proto(u8 byte1) 2572 { 2573 switch((byte1 & 0x1e) >> 1) { 2574 case 3: /* Non-data */ 2575 return ATA_PROT_NODATA; 2576 2577 case 6: /* DMA */ 2578 return ATA_PROT_DMA; 2579 2580 case 4: /* PIO Data-in */ 2581 case 5: /* PIO Data-out */ 2582 return ATA_PROT_PIO; 2583 2584 case 10: /* Device Reset */ 2585 case 0: /* Hard Reset */ 2586 case 1: /* SRST */ 2587 case 2: /* Bus Idle */ 2588 case 7: /* Packet */ 2589 case 8: /* DMA Queued */ 2590 case 9: /* Device Diagnostic */ 2591 case 11: /* UDMA Data-in */ 2592 case 12: /* UDMA Data-Out */ 2593 case 13: /* FPDMA */ 2594 default: /* Reserved */ 2595 break; 2596 } 2597 2598 return ATA_PROT_UNKNOWN; 2599 } 2600 2601 /** 2602 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2603 * @qc: command structure to be initialized 2604 * 2605 * Handles either 12 or 16-byte versions of the CDB. 2606 * 2607 * RETURNS: 2608 * Zero on success, non-zero on failure. 2609 */ 2610 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2611 { 2612 struct ata_taskfile *tf = &(qc->tf); 2613 struct scsi_cmnd *scmd = qc->scsicmd; 2614 struct ata_device *dev = qc->dev; 2615 const u8 *cdb = scmd->cmnd; 2616 2617 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2618 goto invalid_fld; 2619 2620 /* We may not issue DMA commands if no DMA mode is set */ 2621 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2622 goto invalid_fld; 2623 2624 if (cdb[1] & 0xe0) 2625 /* PIO multi not supported yet */ 2626 goto invalid_fld; 2627 2628 /* 2629 * 12 and 16 byte CDBs use different offsets to 2630 * provide the various register values. 2631 */ 2632 if (cdb[0] == ATA_16) { 2633 /* 2634 * 16-byte CDB - may contain extended commands. 2635 * 2636 * If that is the case, copy the upper byte register values. 2637 */ 2638 if (cdb[1] & 0x01) { 2639 tf->hob_feature = cdb[3]; 2640 tf->hob_nsect = cdb[5]; 2641 tf->hob_lbal = cdb[7]; 2642 tf->hob_lbam = cdb[9]; 2643 tf->hob_lbah = cdb[11]; 2644 tf->flags |= ATA_TFLAG_LBA48; 2645 } else 2646 tf->flags &= ~ATA_TFLAG_LBA48; 2647 2648 /* 2649 * Always copy low byte, device and command registers. 2650 */ 2651 tf->feature = cdb[4]; 2652 tf->nsect = cdb[6]; 2653 tf->lbal = cdb[8]; 2654 tf->lbam = cdb[10]; 2655 tf->lbah = cdb[12]; 2656 tf->device = cdb[13]; 2657 tf->command = cdb[14]; 2658 } else { 2659 /* 2660 * 12-byte CDB - incapable of extended commands. 2661 */ 2662 tf->flags &= ~ATA_TFLAG_LBA48; 2663 2664 tf->feature = cdb[3]; 2665 tf->nsect = cdb[4]; 2666 tf->lbal = cdb[5]; 2667 tf->lbam = cdb[6]; 2668 tf->lbah = cdb[7]; 2669 tf->device = cdb[8]; 2670 tf->command = cdb[9]; 2671 } 2672 /* 2673 * If slave is possible, enforce correct master/slave bit 2674 */ 2675 if (qc->ap->flags & ATA_FLAG_SLAVE_POSS) 2676 tf->device = qc->dev->devno ? 2677 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2678 2679 /* 2680 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2681 * SET_FEATURES - XFER MODE must be preceded/succeeded 2682 * by an update to hardware-specific registers for each 2683 * controller (i.e. the reason for ->set_piomode(), 2684 * ->set_dmamode(), and ->post_set_mode() hooks). 2685 */ 2686 if ((tf->command == ATA_CMD_SET_FEATURES) 2687 && (tf->feature == SETFEATURES_XFER)) 2688 goto invalid_fld; 2689 2690 /* 2691 * Set flags so that all registers will be written, 2692 * and pass on write indication (used for PIO/DMA 2693 * setup.) 2694 */ 2695 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE); 2696 2697 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2698 tf->flags |= ATA_TFLAG_WRITE; 2699 2700 /* 2701 * Set transfer length. 2702 * 2703 * TODO: find out if we need to do more here to 2704 * cover scatter/gather case. 2705 */ 2706 qc->nbytes = scmd->request_bufflen; 2707 2708 /* request result TF */ 2709 qc->flags |= ATA_QCFLAG_RESULT_TF; 2710 2711 return 0; 2712 2713 invalid_fld: 2714 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2715 /* "Invalid field in cdb" */ 2716 return 1; 2717 } 2718 2719 /** 2720 * ata_get_xlat_func - check if SCSI to ATA translation is possible 2721 * @dev: ATA device 2722 * @cmd: SCSI command opcode to consider 2723 * 2724 * Look up the SCSI command given, and determine whether the 2725 * SCSI command is to be translated or simulated. 2726 * 2727 * RETURNS: 2728 * Pointer to translation function if possible, %NULL if not. 2729 */ 2730 2731 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 2732 { 2733 switch (cmd) { 2734 case READ_6: 2735 case READ_10: 2736 case READ_16: 2737 2738 case WRITE_6: 2739 case WRITE_10: 2740 case WRITE_16: 2741 return ata_scsi_rw_xlat; 2742 2743 case SYNCHRONIZE_CACHE: 2744 if (ata_try_flush_cache(dev)) 2745 return ata_scsi_flush_xlat; 2746 break; 2747 2748 case VERIFY: 2749 case VERIFY_16: 2750 return ata_scsi_verify_xlat; 2751 2752 case ATA_12: 2753 case ATA_16: 2754 return ata_scsi_pass_thru; 2755 2756 case START_STOP: 2757 return ata_scsi_start_stop_xlat; 2758 } 2759 2760 return NULL; 2761 } 2762 2763 /** 2764 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 2765 * @ap: ATA port to which the command was being sent 2766 * @cmd: SCSI command to dump 2767 * 2768 * Prints the contents of a SCSI command via printk(). 2769 */ 2770 2771 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 2772 struct scsi_cmnd *cmd) 2773 { 2774 #ifdef ATA_DEBUG 2775 struct scsi_device *scsidev = cmd->device; 2776 u8 *scsicmd = cmd->cmnd; 2777 2778 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 2779 ap->print_id, 2780 scsidev->channel, scsidev->id, scsidev->lun, 2781 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 2782 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 2783 scsicmd[8]); 2784 #endif 2785 } 2786 2787 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 2788 void (*done)(struct scsi_cmnd *), 2789 struct ata_device *dev) 2790 { 2791 int rc = 0; 2792 2793 if (unlikely(!scmd->cmd_len)) { 2794 ata_dev_printk(dev, KERN_WARNING, "WARNING: zero len CDB\n"); 2795 scmd->result = DID_ERROR << 16; 2796 done(scmd); 2797 return 0; 2798 } 2799 2800 if (dev->class == ATA_DEV_ATA) { 2801 ata_xlat_func_t xlat_func = ata_get_xlat_func(dev, 2802 scmd->cmnd[0]); 2803 2804 if (xlat_func) 2805 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 2806 else 2807 ata_scsi_simulate(dev, scmd, done); 2808 } else 2809 rc = ata_scsi_translate(dev, scmd, done, atapi_xlat); 2810 2811 return rc; 2812 } 2813 2814 /** 2815 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 2816 * @cmd: SCSI command to be sent 2817 * @done: Completion function, called when command is complete 2818 * 2819 * In some cases, this function translates SCSI commands into 2820 * ATA taskfiles, and queues the taskfiles to be sent to 2821 * hardware. In other cases, this function simulates a 2822 * SCSI device by evaluating and responding to certain 2823 * SCSI commands. This creates the overall effect of 2824 * ATA and ATAPI devices appearing as SCSI devices. 2825 * 2826 * LOCKING: 2827 * Releases scsi-layer-held lock, and obtains host lock. 2828 * 2829 * RETURNS: 2830 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 2831 * 0 otherwise. 2832 */ 2833 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 2834 { 2835 struct ata_port *ap; 2836 struct ata_device *dev; 2837 struct scsi_device *scsidev = cmd->device; 2838 struct Scsi_Host *shost = scsidev->host; 2839 int rc = 0; 2840 2841 ap = ata_shost_to_port(shost); 2842 2843 spin_unlock(shost->host_lock); 2844 spin_lock(ap->lock); 2845 2846 ata_scsi_dump_cdb(ap, cmd); 2847 2848 dev = ata_scsi_find_dev(ap, scsidev); 2849 if (likely(dev)) 2850 rc = __ata_scsi_queuecmd(cmd, done, dev); 2851 else { 2852 cmd->result = (DID_BAD_TARGET << 16); 2853 done(cmd); 2854 } 2855 2856 spin_unlock(ap->lock); 2857 spin_lock(shost->host_lock); 2858 return rc; 2859 } 2860 2861 /** 2862 * ata_scsi_simulate - simulate SCSI command on ATA device 2863 * @dev: the target device 2864 * @cmd: SCSI command being sent to device. 2865 * @done: SCSI command completion function. 2866 * 2867 * Interprets and directly executes a select list of SCSI commands 2868 * that can be handled internally. 2869 * 2870 * LOCKING: 2871 * spin_lock_irqsave(host lock) 2872 */ 2873 2874 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 2875 void (*done)(struct scsi_cmnd *)) 2876 { 2877 struct ata_scsi_args args; 2878 const u8 *scsicmd = cmd->cmnd; 2879 2880 args.dev = dev; 2881 args.id = dev->id; 2882 args.cmd = cmd; 2883 args.done = done; 2884 2885 switch(scsicmd[0]) { 2886 /* no-op's, complete with success */ 2887 case SYNCHRONIZE_CACHE: 2888 case REZERO_UNIT: 2889 case SEEK_6: 2890 case SEEK_10: 2891 case TEST_UNIT_READY: 2892 case FORMAT_UNIT: /* FIXME: correct? */ 2893 case SEND_DIAGNOSTIC: /* FIXME: correct? */ 2894 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 2895 break; 2896 2897 case INQUIRY: 2898 if (scsicmd[1] & 2) /* is CmdDt set? */ 2899 ata_scsi_invalid_field(cmd, done); 2900 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 2901 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 2902 else if (scsicmd[2] == 0x00) 2903 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 2904 else if (scsicmd[2] == 0x80) 2905 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 2906 else if (scsicmd[2] == 0x83) 2907 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 2908 else 2909 ata_scsi_invalid_field(cmd, done); 2910 break; 2911 2912 case MODE_SENSE: 2913 case MODE_SENSE_10: 2914 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 2915 break; 2916 2917 case MODE_SELECT: /* unconditionally return */ 2918 case MODE_SELECT_10: /* bad-field-in-cdb */ 2919 ata_scsi_invalid_field(cmd, done); 2920 break; 2921 2922 case READ_CAPACITY: 2923 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 2924 break; 2925 2926 case SERVICE_ACTION_IN: 2927 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 2928 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 2929 else 2930 ata_scsi_invalid_field(cmd, done); 2931 break; 2932 2933 case REPORT_LUNS: 2934 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 2935 break; 2936 2937 /* mandatory commands we haven't implemented yet */ 2938 case REQUEST_SENSE: 2939 2940 /* all other commands */ 2941 default: 2942 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 2943 /* "Invalid command operation code" */ 2944 done(cmd); 2945 break; 2946 } 2947 } 2948 2949 void ata_scsi_scan_host(struct ata_port *ap) 2950 { 2951 unsigned int i; 2952 2953 if (ap->flags & ATA_FLAG_DISABLED) 2954 return; 2955 2956 for (i = 0; i < ATA_MAX_DEVICES; i++) { 2957 struct ata_device *dev = &ap->device[i]; 2958 struct scsi_device *sdev; 2959 2960 if (!ata_dev_enabled(dev) || dev->sdev) 2961 continue; 2962 2963 sdev = __scsi_add_device(ap->scsi_host, 0, i, 0, NULL); 2964 if (!IS_ERR(sdev)) { 2965 dev->sdev = sdev; 2966 scsi_device_put(sdev); 2967 } 2968 } 2969 } 2970 2971 /** 2972 * ata_scsi_offline_dev - offline attached SCSI device 2973 * @dev: ATA device to offline attached SCSI device for 2974 * 2975 * This function is called from ata_eh_hotplug() and responsible 2976 * for taking the SCSI device attached to @dev offline. This 2977 * function is called with host lock which protects dev->sdev 2978 * against clearing. 2979 * 2980 * LOCKING: 2981 * spin_lock_irqsave(host lock) 2982 * 2983 * RETURNS: 2984 * 1 if attached SCSI device exists, 0 otherwise. 2985 */ 2986 int ata_scsi_offline_dev(struct ata_device *dev) 2987 { 2988 if (dev->sdev) { 2989 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 2990 return 1; 2991 } 2992 return 0; 2993 } 2994 2995 /** 2996 * ata_scsi_remove_dev - remove attached SCSI device 2997 * @dev: ATA device to remove attached SCSI device for 2998 * 2999 * This function is called from ata_eh_scsi_hotplug() and 3000 * responsible for removing the SCSI device attached to @dev. 3001 * 3002 * LOCKING: 3003 * Kernel thread context (may sleep). 3004 */ 3005 static void ata_scsi_remove_dev(struct ata_device *dev) 3006 { 3007 struct ata_port *ap = dev->ap; 3008 struct scsi_device *sdev; 3009 unsigned long flags; 3010 3011 /* Alas, we need to grab scan_mutex to ensure SCSI device 3012 * state doesn't change underneath us and thus 3013 * scsi_device_get() always succeeds. The mutex locking can 3014 * be removed if there is __scsi_device_get() interface which 3015 * increments reference counts regardless of device state. 3016 */ 3017 mutex_lock(&ap->scsi_host->scan_mutex); 3018 spin_lock_irqsave(ap->lock, flags); 3019 3020 /* clearing dev->sdev is protected by host lock */ 3021 sdev = dev->sdev; 3022 dev->sdev = NULL; 3023 3024 if (sdev) { 3025 /* If user initiated unplug races with us, sdev can go 3026 * away underneath us after the host lock and 3027 * scan_mutex are released. Hold onto it. 3028 */ 3029 if (scsi_device_get(sdev) == 0) { 3030 /* The following ensures the attached sdev is 3031 * offline on return from ata_scsi_offline_dev() 3032 * regardless it wins or loses the race 3033 * against this function. 3034 */ 3035 scsi_device_set_state(sdev, SDEV_OFFLINE); 3036 } else { 3037 WARN_ON(1); 3038 sdev = NULL; 3039 } 3040 } 3041 3042 spin_unlock_irqrestore(ap->lock, flags); 3043 mutex_unlock(&ap->scsi_host->scan_mutex); 3044 3045 if (sdev) { 3046 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3047 sdev->sdev_gendev.bus_id); 3048 3049 scsi_remove_device(sdev); 3050 scsi_device_put(sdev); 3051 } 3052 } 3053 3054 /** 3055 * ata_scsi_hotplug - SCSI part of hotplug 3056 * @work: Pointer to ATA port to perform SCSI hotplug on 3057 * 3058 * Perform SCSI part of hotplug. It's executed from a separate 3059 * workqueue after EH completes. This is necessary because SCSI 3060 * hot plugging requires working EH and hot unplugging is 3061 * synchronized with hot plugging with a mutex. 3062 * 3063 * LOCKING: 3064 * Kernel thread context (may sleep). 3065 */ 3066 void ata_scsi_hotplug(struct work_struct *work) 3067 { 3068 struct ata_port *ap = 3069 container_of(work, struct ata_port, hotplug_task.work); 3070 int i; 3071 3072 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3073 DPRINTK("ENTER/EXIT - unloading\n"); 3074 return; 3075 } 3076 3077 DPRINTK("ENTER\n"); 3078 3079 /* unplug detached devices */ 3080 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3081 struct ata_device *dev = &ap->device[i]; 3082 unsigned long flags; 3083 3084 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3085 continue; 3086 3087 spin_lock_irqsave(ap->lock, flags); 3088 dev->flags &= ~ATA_DFLAG_DETACHED; 3089 spin_unlock_irqrestore(ap->lock, flags); 3090 3091 ata_scsi_remove_dev(dev); 3092 } 3093 3094 /* scan for new ones */ 3095 ata_scsi_scan_host(ap); 3096 3097 /* If we scanned while EH was in progress, scan would have 3098 * failed silently. Requeue if there are enabled but 3099 * unattached devices. 3100 */ 3101 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3102 struct ata_device *dev = &ap->device[i]; 3103 if (ata_dev_enabled(dev) && !dev->sdev) { 3104 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3105 round_jiffies_relative(HZ)); 3106 break; 3107 } 3108 } 3109 3110 DPRINTK("EXIT\n"); 3111 } 3112 3113 /** 3114 * ata_scsi_user_scan - indication for user-initiated bus scan 3115 * @shost: SCSI host to scan 3116 * @channel: Channel to scan 3117 * @id: ID to scan 3118 * @lun: LUN to scan 3119 * 3120 * This function is called when user explicitly requests bus 3121 * scan. Set probe pending flag and invoke EH. 3122 * 3123 * LOCKING: 3124 * SCSI layer (we don't care) 3125 * 3126 * RETURNS: 3127 * Zero. 3128 */ 3129 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3130 unsigned int id, unsigned int lun) 3131 { 3132 struct ata_port *ap = ata_shost_to_port(shost); 3133 unsigned long flags; 3134 int rc = 0; 3135 3136 if (!ap->ops->error_handler) 3137 return -EOPNOTSUPP; 3138 3139 if ((channel != SCAN_WILD_CARD && channel != 0) || 3140 (lun != SCAN_WILD_CARD && lun != 0)) 3141 return -EINVAL; 3142 3143 spin_lock_irqsave(ap->lock, flags); 3144 3145 if (id == SCAN_WILD_CARD) { 3146 ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1; 3147 ap->eh_info.action |= ATA_EH_SOFTRESET; 3148 } else { 3149 struct ata_device *dev = ata_find_dev(ap, id); 3150 3151 if (dev) { 3152 ap->eh_info.probe_mask |= 1 << dev->devno; 3153 ap->eh_info.action |= ATA_EH_SOFTRESET; 3154 ap->eh_info.flags |= ATA_EHI_RESUME_LINK; 3155 } else 3156 rc = -EINVAL; 3157 } 3158 3159 if (rc == 0) { 3160 ata_port_schedule_eh(ap); 3161 spin_unlock_irqrestore(ap->lock, flags); 3162 ata_port_wait_eh(ap); 3163 } else 3164 spin_unlock_irqrestore(ap->lock, flags); 3165 3166 return rc; 3167 } 3168 3169 /** 3170 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3171 * @work: Pointer to ATA port to perform scsi_rescan_device() 3172 * 3173 * After ATA pass thru (SAT) commands are executed successfully, 3174 * libata need to propagate the changes to SCSI layer. This 3175 * function must be executed from ata_aux_wq such that sdev 3176 * attach/detach don't race with rescan. 3177 * 3178 * LOCKING: 3179 * Kernel thread context (may sleep). 3180 */ 3181 void ata_scsi_dev_rescan(struct work_struct *work) 3182 { 3183 struct ata_port *ap = 3184 container_of(work, struct ata_port, scsi_rescan_task); 3185 unsigned long flags; 3186 unsigned int i; 3187 3188 spin_lock_irqsave(ap->lock, flags); 3189 3190 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3191 struct ata_device *dev = &ap->device[i]; 3192 struct scsi_device *sdev = dev->sdev; 3193 3194 if (!ata_dev_enabled(dev) || !sdev) 3195 continue; 3196 if (scsi_device_get(sdev)) 3197 continue; 3198 3199 spin_unlock_irqrestore(ap->lock, flags); 3200 scsi_rescan_device(&(sdev->sdev_gendev)); 3201 scsi_device_put(sdev); 3202 spin_lock_irqsave(ap->lock, flags); 3203 } 3204 3205 spin_unlock_irqrestore(ap->lock, flags); 3206 } 3207 3208 /** 3209 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3210 * @host: ATA host container for all SAS ports 3211 * @port_info: Information from low-level host driver 3212 * @shost: SCSI host that the scsi device is attached to 3213 * 3214 * LOCKING: 3215 * PCI/etc. bus probe sem. 3216 * 3217 * RETURNS: 3218 * ata_port pointer on success / NULL on failure. 3219 */ 3220 3221 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3222 struct ata_port_info *port_info, 3223 struct Scsi_Host *shost) 3224 { 3225 struct ata_port *ap = kzalloc(sizeof(*ap), GFP_KERNEL); 3226 struct ata_probe_ent *ent; 3227 3228 if (!ap) 3229 return NULL; 3230 3231 ent = ata_probe_ent_alloc(host->dev, port_info); 3232 if (!ent) { 3233 kfree(ap); 3234 return NULL; 3235 } 3236 3237 ata_port_init(ap, host, ent, 0); 3238 ap->lock = shost->host_lock; 3239 devm_kfree(host->dev, ent); 3240 return ap; 3241 } 3242 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3243 3244 /** 3245 * ata_sas_port_start - Set port up for dma. 3246 * @ap: Port to initialize 3247 * 3248 * Called just after data structures for each port are 3249 * initialized. Allocates DMA pad. 3250 * 3251 * May be used as the port_start() entry in ata_port_operations. 3252 * 3253 * LOCKING: 3254 * Inherited from caller. 3255 */ 3256 int ata_sas_port_start(struct ata_port *ap) 3257 { 3258 return ata_pad_alloc(ap, ap->dev); 3259 } 3260 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3261 3262 /** 3263 * ata_port_stop - Undo ata_sas_port_start() 3264 * @ap: Port to shut down 3265 * 3266 * Frees the DMA pad. 3267 * 3268 * May be used as the port_stop() entry in ata_port_operations. 3269 * 3270 * LOCKING: 3271 * Inherited from caller. 3272 */ 3273 3274 void ata_sas_port_stop(struct ata_port *ap) 3275 { 3276 ata_pad_free(ap, ap->dev); 3277 } 3278 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3279 3280 /** 3281 * ata_sas_port_init - Initialize a SATA device 3282 * @ap: SATA port to initialize 3283 * 3284 * LOCKING: 3285 * PCI/etc. bus probe sem. 3286 * 3287 * RETURNS: 3288 * Zero on success, non-zero on error. 3289 */ 3290 3291 int ata_sas_port_init(struct ata_port *ap) 3292 { 3293 int rc = ap->ops->port_start(ap); 3294 3295 if (!rc) 3296 rc = ata_bus_probe(ap); 3297 3298 return rc; 3299 } 3300 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3301 3302 /** 3303 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3304 * @ap: SATA port to destroy 3305 * 3306 */ 3307 3308 void ata_sas_port_destroy(struct ata_port *ap) 3309 { 3310 if (ap->ops->port_stop) 3311 ap->ops->port_stop(ap); 3312 kfree(ap); 3313 } 3314 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3315 3316 /** 3317 * ata_sas_slave_configure - Default slave_config routine for libata devices 3318 * @sdev: SCSI device to configure 3319 * @ap: ATA port to which SCSI device is attached 3320 * 3321 * RETURNS: 3322 * Zero. 3323 */ 3324 3325 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3326 { 3327 ata_scsi_sdev_config(sdev); 3328 ata_scsi_dev_config(sdev, ap->device); 3329 return 0; 3330 } 3331 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3332 3333 /** 3334 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3335 * @cmd: SCSI command to be sent 3336 * @done: Completion function, called when command is complete 3337 * @ap: ATA port to which the command is being sent 3338 * 3339 * RETURNS: 3340 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3341 * 0 otherwise. 3342 */ 3343 3344 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3345 struct ata_port *ap) 3346 { 3347 int rc = 0; 3348 3349 ata_scsi_dump_cdb(ap, cmd); 3350 3351 if (likely(ata_scsi_dev_enabled(ap->device))) 3352 rc = __ata_scsi_queuecmd(cmd, done, ap->device); 3353 else { 3354 cmd->result = (DID_BAD_TARGET << 16); 3355 done(cmd); 3356 } 3357 return rc; 3358 } 3359 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3360